CN216434876U

CN216434876U - CPU power supply circuit and terminal equipment compatible with power supply

Info

Publication number: CN216434876U
Application number: CN202121139381.3U
Authority: CN
Inventors: 刘超; 丁永波; 李优斌
Original assignee: Shenzhen Weibu Information Co Ltd
Current assignee: Shenzhen Weibu Information Co Ltd
Priority date: 2021-05-26
Filing date: 2021-05-26
Publication date: 2022-05-03
Anticipated expiration: 2031-05-26

Abstract

The embodiment of the utility model discloses a CPU power supply circuit and terminal equipment compatible with power supply, wherein the CPU power supply circuit comprises a control module and a driving module; the driving module is connected with the control module and the CPU; when the control module detects starting, the currently set voltage parameter is acquired and a corresponding driving signal is generated; and the driving module controls the on-off of the core power supply path according to the driving signal and outputs the core voltage corresponding to the voltage parameter to supply power to the CPU. The voltage parameter is used for setting the voltage value of the core voltage required by the CPU, and the voltage parameter can be changed, so that only a CPU power supply circuit with one circuit structure needs to be designed, the power supply requirements of different CPU cores can be met by modifying the voltage parameter, the compatibility of the CPU power supply circuit is increased, power supply modules with different circuit structures do not need to be produced, and the classification of the power supply modules is greatly reduced.

Description

CPU power supply circuit and terminal equipment compatible with power supply

Technical Field

The utility model relates to the technical field of electronics, in particular to a CPU power supply circuit compatible with power supply and a terminal device.

Background

A CPU (central processing unit) is one of the main devices of an electronic computer, and is a core component in the computer. Currently, only some of the CPUs of foreign brands (e.g., Intel (Intel), AMD (ultra-willemiconductor)) support the SVID (serial voltage identification) protocol function; the power module of the CPU can provide voltage power supply corresponding to a volt value for the CPU core according to the power consumption requirement of the CPU. Most CPU cores only support fixed voltage power supply, the existing power supply module can only output core voltage with a fixed voltage value to supply power to the CPU, and the power supplies required by the CPU in different working states are different, so that the power supply modules with different circuit structures need to be designed and produced, one circuit structure outputs one set core voltage, the classification of the power supply modules is more, and the compatibility of the power supply to the CPU cores is poor.

SUMMERY OF THE UTILITY MODEL

In view of the above technical problems, embodiments of the present invention provide a CPU power supply circuit and a terminal device compatible with power supply, so as to solve the problem that the compatibility of the power supply module of the existing CPU for supplying power to the CPU core is poor.

The embodiment of the utility model provides a CPU power supply circuit compatible with power supply, which is connected with a CPU and comprises a control module and a driving module; the driving module is connected with the control module and the CPU;

when the control module detects starting, the currently set voltage parameter is acquired and a corresponding driving signal is generated; and the driving module controls the on-off of the core power supply path according to the driving signal and outputs the core voltage corresponding to the voltage parameter to supply power to the CPU.

Optionally, in the CPU power supply circuit compatible with power supply, the control module includes a main control circuit, a start circuit, a compensation circuit, a current monitoring circuit, and an output voltage adjusting circuit; the starting circuit, the compensation circuit, the current monitoring circuit and the output voltage regulating circuit are all connected with the main control circuit; the main control circuit is connected with the driving module;

the starting circuit outputs a corresponding starting signal according to an input enabling signal to control the on-off of the main control circuit;

the output voltage regulating circuit outputs corresponding voltage parameters to the main control circuit according to the connection state of each internal resistor;

the current monitoring circuit samples, monitors the temperature and filters the core current in the driving module;

when the main control circuit is started, generating a corresponding driving signal to the driving module according to the currently set voltage parameter, detecting the current temperature and performing over-temperature protection; adjusting a driving signal according to the sampled core current to enable the core voltage to reach a set value, and judging the size of the core current to perform overvoltage and overcurrent protection;

the compensation circuit is used for filtering and stabilizing the core voltage.

Optionally, in the power supply compatible CPU circuit, the driving module includes a first driving unit and a second driving unit, the first driving unit is connected to the main control circuit and the CPU, the second driving unit is connected to the main control circuit and the CPU, and the first driving unit is connected to the second driving unit;

the first driving unit controls the on-off of a first core power supply path according to a first group of driving signals output by the main control circuit, and outputs core voltage corresponding to the voltage parameter to supply power to the CPU;

the second driving unit controls the on-off of a second core power supply path according to a second group of driving signals output by the main control circuit, and outputs core voltage corresponding to the voltage parameter to supply power to the CPU;

the first driving unit and the second driving unit output the current core current to the main control circuit.

Optionally, in the CPU power supply circuit compatible with power supply, the main control circuit includes a power supply chip, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor, and a first thermistor;

the PGOOD pin, the PSI # pin, the CLK _ EN # pin and the DPRSLPVR pin of the power supply chip are all connected with a first power supply end; a VR _ TT # pin of the power chip is connected with a second power supply end, an NTC pin of the power chip is connected with one end of the first thermistor and one end of the first capacitor, and the other end of the first thermistor is connected with the other end of the first capacitor and the ground through the first resistor; a VW pin, a COMP pin, an FB pin, an ISEN3/FB2 pin and a VSEN pin of the power supply chip are all connected with a compensation circuit; an ISEN2 pin of the power chip is connected with one end of a second capacitor and a second driving unit, the other end of the second capacitor is connected with a first driving unit and a second driving unit, an ISEN1 pin of the power chip is connected with one end of a third capacitor and the first driving unit, the other end of the third capacitor is connected with the first driving unit and the second driving unit, a VSEN pin of the power chip is also connected with a core power supply end and one end of a fourth capacitor, an RTN pin of the power chip is connected with the other end of the fourth capacitor, one end of a second resistor and an IMON pin of the power chip, and the other end of the second resistor is grounded; the ISUM-pin and the ISUM + pin of the power supply chip are both connected with a current monitoring circuit; the VDD pin, the PWM3/LGATE1B pin and the VCCP pin of the power chip are all connected with a third power supply end, and the VIN pin of the power chip is connected with a fourth power supply end; the BOOT1 pin, UGATE1 pin, PHASE1 pin and LGATE1 pin of the power chip are all connected with the first driving unit; the BOOT2 pin, UGATE2 pin, PHASE2 pin and LGATE2 pin of the power chip are all connected with the second driving unit; a VR _ ON pin of the power chip is connected with the starting circuit; pins VID0 to VID6 of the power chip are all connected with the output voltage regulating circuit; the RBIAS pin, the PAD pin, the VSSP1 pin and the VSSP2 pin of the power supply chip are all grounded.

Optionally, in the CPU power supply circuit compatible with power supply, the starting circuit includes a first switching tube, a second switching tube, a third resistor, a fourth resistor, and a fifth resistor;

the grid electrode of the first switch tube is connected with one end of a third resistor, the other end of the third resistor inputs an enabling signal, the source electrode of the first switch tube is connected with the source electrode of the second switch tube and the ground, and the drain electrode of the first switch tube is connected with a standby power supply end through a fourth resistor; the drain electrode of the second switching tube is connected with one end of a fifth resistor and a VR _ ON pin of the power supply chip, and the other end of the fifth resistor is connected with a first power supply end.

Optionally, in the CPU power supply circuit compatible with power supply, the compensation circuit includes a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor, and a ninth capacitor;

one end of the sixth resistor is connected with one end of the fifth capacitor and a VW pin of the power supply chip; the other end of the sixth resistor is connected with the other end of the fifth capacitor, one end of the sixth capacitor, a COMP pin of the power supply chip and one end of the seventh capacitor; the other end of the sixth capacitor is connected with an ISEN3/FB2 pin of the power supply chip; the other end of the seventh capacitor is connected with one end of the seventh resistor, one end of the eighth resistor, one end of the ninth resistor and the FB pin of the power supply chip; the other end of the seventh resistor is connected with one end of the seventh capacitor through the eighth capacitor, and the other end of the eighth resistor is connected with the other end of the ninth resistor and the VSEN pin of the power supply chip through the ninth capacitor.

Optionally, in the power supply compatible CPU power supply circuit, the current monitoring circuit includes a second thermistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, and a thirteenth capacitor;

one end of the tenth capacitor is connected with an ISUM + pin of the power supply chip, one end of the twelfth capacitor and one end of the thirteenth resistor; the other end of the tenth capacitor is connected with one end of a tenth resistor, one end of an eleventh capacitor and an ISUM-pin of the power supply chip; the other end of the eleventh capacitor is connected with the other end of the tenth resistor, the other end of the twelfth capacitor and the other end of the thirteenth resistor through the eleventh resistor; one end of the twelfth resistor is connected with one end of the thirteenth resistor, the first driving unit and the second driving unit; the other end of the twelfth resistor is connected with one end of a second thermistor, and the other end of the second thermistor is connected with the other end of a thirteenth resistor, one end of a thirteenth capacitor, a first driving unit and a second driving unit; the other end of the thirteenth capacitor is grounded.

Optionally, in the power supply compatible CPU power supply circuit, the output voltage adjusting circuit includes a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, and a twentieth resistor;

one end of the fourteenth resistor is connected with the VID0 pin of the power supply chip, and the other end of the fourteenth resistor is connected with one end of the eighteenth resistor, one end of the nineteenth resistor and the first power supply end; the fifteenth resistor is connected between the VID1 pin of the power chip and ground, the sixteenth resistor is connected between the VID2 pin of the power chip and ground, the seventeenth resistor is connected between the VID3 pin of the power chip and ground, the other end of the eighteenth resistor is connected to the VID4 pin of the power chip, the other end of the nineteenth resistor is connected to the VID5 pin of the power chip, and the twentieth resistor is connected between the VID6 pin of the power chip and ground.

Optionally, in the CPU power circuit compatible with power supply, the first driving unit includes a third switching tube, a fourth switching tube, a fifth switching tube, a first inductor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a fourteenth capacitor, and a fifteenth capacitor; the grid electrode of the third switching tube is connected with one end of the twenty-first resistor and the UGATE1 pin of the power chip; the source electrode of the third switching tube is connected with the drain electrode of the fourth switching tube, the other end of the twenty-first resistor, one end of the fourteenth capacitor and the PHASE1 pin of the power supply chip; the other end of the fourteenth capacitor is connected with a BOOT1 pin of the power chip, the drain electrode of the third switching tube is connected with a fourth power supply end, the grid electrode of the fourth switching tube is connected with the grid electrode of the fifth switching tube and an LGATE1 pin of the power chip, and the source electrode of the fourth switching tube and the source electrode of the fifth switching tube are both grounded; the drain electrode of the fifth switching tube is connected with the drain electrode of the fourth switching tube, one end of the twenty-second resistor, one end of the twenty-third resistor and one end of the first inductor; the other end of the twenty-second resistor is connected with an ISEN1 pin of the power supply chip, and the other end of the twenty-third resistor is connected with one end of the twelfth resistor; the other end of the first inductor is connected with one end of a fifteenth capacitor, the core power supply end, the other end of the second capacitor, the other end of the third capacitor and the other end of the second thermistor; the other terminal of the fifteenth capacitor is connected to ground.

A second aspect of the embodiments of the present invention provides a terminal device, including a motherboard, where the motherboard is provided with a CPU, and the motherboard is further provided with a CPU power circuit compatible with power supply, and the CPU power circuit compatible with power supply is connected to the CPU;

the CPU power supply circuit generates a corresponding driving signal according to a preset voltage parameter to control the on-off of an internal core power supply path, and outputs a core voltage corresponding to the voltage parameter to supply power to the CPU.

In the technical scheme provided by the embodiment of the utility model, a CPU power supply circuit compatible with power supply is connected with a CPU, and the CPU power supply circuit comprises a control module and a driving module; the driving module is connected with the control module and the CPU;

when the control module detects starting, the currently set voltage parameter is acquired and a corresponding driving signal is generated; and the driving module controls the on-off of the core power supply path according to the driving signal and outputs the core voltage corresponding to the voltage parameter to supply power to the CPU. The voltage parameter is used for setting the voltage value of the core voltage required by the CPU, and the voltage parameter can be changed, so that the voltage parameter can be adjusted according to the core voltage required by the CPU, and the required core voltage is output; only need design the CPU power supply circuit of a circuit structure, just can make it satisfy different CPU core power supply demands through revising voltage parameter, increased CPU power supply circuit's compatibility, need not to produce the power module of different circuit structures, the classification of the power module that has significantly reduced.

Drawings

Fig. 1 is a block diagram of a terminal device according to an embodiment of the present invention.

Fig. 2 is a circuit diagram of a control module according to an embodiment of the utility model.

Fig. 3 is a circuit diagram of a first driving unit according to an embodiment of the utility model.

Fig. 4 is a circuit diagram of a second driving unit according to an embodiment of the utility model.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The embodiments of the present invention, and all other embodiments obtained by those skilled in the art without any inventive step, belong to the protection scope of the present invention.

Referring to fig. 1, the terminal device according to the embodiment of the present invention includes a motherboard, where a CPU power circuit 10 and a CPU (central processing unit) 20 compatible with power supply are disposed on the motherboard, and the CPU power circuit 10 compatible with power supply is connected to the CPU 20. The CPU power circuit 10 generates a corresponding driving signal according to a preset voltage parameter to control the on-off of an internal CORE power supply path, outputs a CORE voltage VDD _ CORE corresponding to the voltage parameter to supply power to the CPU, and adjusts the voltage of the CORE voltage VDD _ CORE according to the sampled CORE current until the voltage reaches a set value. The voltage parameter is used for setting the voltage value of the CORE voltage VDD _ CORE required by the CPU, and the voltage parameter can be changed, so that the voltage parameter can be adjusted according to the CORE voltage required by the CPU, and the required CORE voltage is output; only need design the CPU power supply circuit of a circuit structure, just can make it satisfy different CPU core power supply demands through revising voltage parameter, increased CPU power supply circuit's compatibility, need not to produce the power module of different circuit structures, the classification of the power module that has significantly reduced.

The CPU power supply circuit compatible with power supply is applied to a domestic platform Feiteng processor and can also be applied to special industries in severe environments. The terminal equipment is a desktop, an all-in-one machine, a server, a tablet personal computer, a notebook computer, a mobile phone (especially a smart phone) and the like, is internally provided with a CPU, and needs to supply power to the CPU. The CPU is a CPU of all models that only supports fixed voltage power supply at present, such as a CPU of a distribution department, and here, the CORE voltage VDD _ CORE is mainly adjusted by adjusting a voltage parameter, and the connection with a pin of the CPU is the prior art, and is not described in detail here.

In this embodiment, the CPU power circuit 10 compatible with power supply includes a control module 11 and a driving module 120; the driving module 120 is connected with the control module 110 and the CPU; when the control module 11 detects a power-on operation, the currently set voltage parameter is acquired and a corresponding driving signal is generated; the driving module 120 controls the on/off of the CORE power supply path according to the driving signal, and outputs the CORE voltage VDD _ CORE corresponding to the voltage parameter to supply power to the CPU. The control module 11 further performs temperature and voltage protection on the CORE voltage VDD _ CORE, and also samples the CORE current in the driving module 120, and adjusts the voltage of the CORE voltage VDD _ CORE according to the CORE current until a set value (i.e., a voltage value corresponding to the voltage parameter) is reached.

The control module 110 comprises a main control circuit 111, a starting circuit 112, a compensation circuit 113, a current monitoring circuit 114 and an output voltage regulating circuit 115; the starting circuit 112, the compensation circuit 113, the current monitoring circuit 114 and the output voltage regulating circuit 115 are all connected with the main control circuit 111; the main control circuit 111 is connected with the driving module.

The starting circuit 112 outputs a corresponding starting signal VR _ ON according to an enabling signal VDD _ CORE _ EN generated by key operation to control the ON-off of the main control circuit 111; the output voltage adjusting circuit 115 outputs corresponding voltage parameters to the main control circuit 111 according to the connection state of each internal resistor; when the main control circuit 111 is started, generating a corresponding driving signal to the driving module 120 according to a currently set voltage parameter, detecting a current temperature and performing over-temperature protection, adjusting the driving signal according to a sampled core current to enable the core voltage to reach a set value, and judging the size of the core current to perform over-voltage and over-current protection; the compensation circuit 113 is used for filtering and stabilizing the CORE voltage VDD _ CORE; the current monitoring circuit 114 samples, temperature monitors, and filters the core current within the driver module 120.

The driving module 120 may have a plurality of driving units, which are 2 in this embodiment, and include a first driving unit 121 and a second driving unit 122, if the loading capacity needs to be increased, the number of the driving units may be increased, and the main control circuit 111 outputs a corresponding set of driving signals for each driving unit. The first driving unit 121 is connected to the main control circuit 111 and the CPU, the second driving unit 122 is connected to the main control circuit 111 and the CPU, and the first driving unit 121 is connected to the second driving unit 122. The first driving unit 121 controls the on-off of the first CORE power supply path according to a first group of driving signals (including UGATE1, BOOT1, PHASE1 and LGATE1) output by the main control circuit 111, and outputs a CORE voltage VDD _ CORE corresponding to the voltage parameter to supply power to the CPU; the second driving unit 122 controls the on/off of the second CORE power supply path according to a second set of driving signals (including UGATE2, BOOT2, PHASE2, LGATE2) output by the main control circuit 111, and outputs a CORE voltage VDD _ CORE corresponding to the voltage parameter to supply power to the CPU. If the required core current is small, only the first driving unit 121 can be controlled to work; if the core current is larger, the two driving units can be controlled to work simultaneously to increase the loading capacity. The first driving unit 121 and the second driving unit 122 output the current core current to the main control circuit 111.

Referring to fig. 2, the main control circuit 111 includes a power chip U1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a first resistor R1, a second resistor R2, and a first thermistor RN 1; the PGOOD pin, the PSI # pin, the CLK _ EN # pin and the DPRSLPVR pin of the power chip U1 are all connected with a first power supply end (the first power supply end is used for inputting a first voltage +3VS of 3V, and the first power supply end can be connected with a resistor during specific implementation); the pin VR _ TT # of the power chip U1 is connected to a second power source terminal (the second power source terminal is used for inputting a second voltage P1V8_ VDDIO of 1.8V, and in a specific implementation, the second power source terminal may be connected through a resistor), the NTC pin of the power chip U1 is connected to one end of the first thermistor RN1 and one end of the first capacitor C1, and the other end of the first thermistor RN1 is connected to the other end of the first capacitor C1 and the ground through the first resistor R1; a VW pin, a COMP pin, an FB pin, an ISEN3/FB2 pin and a VSEN pin of the power chip U1 are all connected with the compensation circuit 113; an ISEN2 pin of the power chip U1 is connected with one end of a second capacitor C2 and the second driving unit 122, the other end of the second capacitor C2 is connected with the first driving unit 121 and the second driving unit 122, an ISEN1 pin of the power chip U1 is connected with one end of a third capacitor C3 and the first driving unit 121, the other end of the third capacitor C3 is connected with the first driving unit 121 and the second driving unit 122, a VSEN pin of the power chip U1 is also connected with a CORE power supply end (namely output ends of the two driving units for outputting a CORE voltage VDD _ CORE) and one end of a fourth capacitor C4, an RTN pin of the power chip U1 is connected with the other end of the fourth capacitor C4, one end of a second resistor R2 and an IMON pin of the power chip U1, and the other end of the second resistor R2 is grounded; the ISUM-pin and the ISUM + pin of the power supply chip U1 are both connected with the current monitoring circuit 114; the VDD pin, the PWM3/LGATE1B pin and the VCCP pin of the power chip U1 are all connected with a third power supply end (inputting a third voltage of 5V +5VS), and the VIN pin of the power chip U1 is connected with a fourth power supply end (inputting a fourth voltage + VDC); the BOOT1 pin, UGATE1 pin, PHASE1 pin and LGATE1 pin of the power chip U1 are all connected with the first driving unit 121; the BOOT2 pin, UGATE2 pin, PHASE2 pin and LGATE2 pin of the power chip U1 are all connected to the second driving unit 122; the VR _ ON pin of the power chip U1 is connected with the starting circuit 112; the VID0 pin, the VID1 pin, the VID2 pin, the VID3 pin, the VID4 pin, the VID5 pin and the VID6 pin of the power supply chip U1 are all connected with the output voltage regulating circuit 115; the RBIAS pin, the PAD pin, the VSSP1 pin and the VSSP2 pin of the power chip U1 are all grounded.

The power supply chip U1 is preferably a PWM power supply chip with the model number of ISL 62883C. Each power end in this embodiment is provided by an existing power module on the motherboard, which is a prior art and does not describe the specific circuit structure of the power module in detail. After the mainboard is powered on (the adapter is inserted), the power module provides standby voltage for the power chip U1, and when the key on the mainboard executes the power-on operation, the power module provides various voltages required by the work for the power chip U1. The start signal VR _ ON output by the start circuit 112 controls the source chip to start up. A PWM logic manager built in the power chip reads the voltage parameter set by the output voltage regulator circuit 115, identifies the magnitude of the required core voltage by querying an internal pre-stored voltage comparison table (as shown in table 1 below, the numerical values in the table are only schematic and not shown completely, and the specific values are set by developers), coordinates the operation of the two internal MOSFET drivers, and can only generate a first set of driving signals (UGATE1, BOOT1, PHASE1, LGATE1) to control the operation of the first driving unit 121 if the required core voltage (corresponding to the core current) is small; if the CORE voltage is larger, a first group of driving signals (UGATE1, BOOT1, PHASE1 and LGATE1) and a second group of driving signals (UGATE2, BOOT2, PHASE2 and LGATE2) can be generated at the same time to respectively control the on-off of the CORE power supply paths of the two external driving units, and the corresponding CORE voltage VDD _ CORE is output to supply power to the CPU. The two driving units work simultaneously, so that the loading capacity can be increased and the high-current requirement can be met.

TABLE 1

Each step of voltage regulating voltage value of each CORE voltage VDD _ CORE in the voltage comparison table is 12.5mV, and the adjustable range is 0-1.5V. The ISEN1 pin of the power chip U1 detects the first PHASE (PHASE1) power by sampling the ISEN1 signal and the VSUM 1-signal (corresponding to the negative value of the total current) on the first driving unit 121, and the ISEN2 pin detects the first PHASE (PHASE1) power by sampling the ISEN2 signal and the VSUM 2-signal on the second driving unit 122. The positive voltage detection is performed by combining with sampling of a CORE voltage VDD _ CORE by a VSEN pin, voltage negative detection is performed by CPUVSS _ SENSE signals sampled by an RTN pin (sampled by a second resistor R2 and a fourth capacitor C4), and output total current is monitored by sampling of VSUM +/-signals (total current) by a current monitoring circuit 114 by an ISUM-pin and an ISUM + pin, so that whether the adjusted CORE voltage VDD _ CORE reaches a required voltage value or whether overcurrent (the current value is greater than the preset current) and overvoltage (the voltage value calculated according to the current value is greater than the preset voltage) occur can be judged, and if the regulated CORE voltage VDD _ CORE does not reach the required voltage value, the corresponding driving signal is adjusted to control the corresponding driving unit, and the CORE voltage VDD _ CORE is continuously adjusted; and if overcurrent or overvoltage occurs, performing corresponding overvoltage protection and overcurrent protection.

Meanwhile, a chip temperature monitoring circuit is formed by the first capacitor C1, the first resistor R1 and the first thermistor RN1, the resistance value of the first thermistor RN1(NTC resistor) changes along with the temperature, so that the voltage on an NTC pin is changed, over-temperature protection can be performed according to the voltage value, the power supply chip U1 works in a space with proper temperature, the circuit works more safely, and the safety performance is more stable.

Preferably, the PGOOD of the power chip U1 may further be connected to a reserved test pin, and a level value of the power supply detection signal VDD _ CORE _ PWRGD on the test pin is led out through a probe, so that whether the power supply of the power chip U1 is normal or not can be determined, and it is convenient to detect whether there is a power supply problem in a later stage fault.

With reference to fig. 2, the start-up circuit 112 includes a first switch Q1, a second switch Q2, a third resistor R3, a fourth resistor R4, and a fifth resistor R5; a gate (G) of the first switch Q1 is connected to one end of a third resistor R3, the other end of the third resistor R3 inputs an enable signal VDD _ CORE _ EN (the other end of the third resistor R3 may be connected to a key module on a main board, i.e., the enable signal VDD _ CORE _ EN generated according to key operation is input), a source (S) of the first switch Q1 is connected to a source of the second switch Q2 and ground, and a drain (D) of the first switch Q1 is connected to a standby power supply terminal (providing a standby voltage +3VSB) through a fourth resistor R4; the drain (D) of the second switch transistor Q2 is connected to one end of the fifth resistor R5 and the VR _ ON pin of the power chip U1, and the other end of the fifth resistor R5 is connected to the first power supply terminal.

The first switch tube Q1 and the second switch tube Q2 are both NMOS tubes. When the adapter is plugged in, it indicates power-on, and the standby voltage +3VSB is generated on the mainboard. When a user starts up the computer through a key ON the main board, a high-level enable signal VDD _ CORE _ EN and a first voltage +3VS (generated earlier than the enable signal VDD _ CORE _ EN) are generated, at this time, the first switch tube Q1 is turned ON, the second switch tube Q2 is turned off, and the high-level first voltage +3VS is used as a start signal VR _ ON to control the power chip U1 to start up. When the key is turned off, the enable signal VDD _ CORE _ EN changes to a low level, the first voltage +3VS, which is the system voltage, also changes to a low level, the first switch Q1 is turned off, the standby voltage +3VSB of the high level controls the second switch Q2 to be turned ON, and at this time, the start signal VR _ ON is pulled down to a low level to control the power chip U1 to stop working. Compared with the prior art in which the start signal VR _ ON is directly input, the start circuit 112 added in the present embodiment generates the start signal VR _ ON according to the power-ON timing sequence, and can control the power chip to operate after the voltage is stabilized.

The compensation circuit 113 comprises a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8 and a ninth capacitor C9; one end of the sixth resistor R6 is connected with one end of the fifth capacitor C5 and a VW pin of the power supply chip U1; the other end of the sixth resistor R6 is connected with the other end of the fifth capacitor C5, one end of the sixth capacitor C6, a COMP pin of the power supply chip U1 and one end of the seventh capacitor C7; the other end of the sixth capacitor C6 is connected with an ISEN3/FB2 pin of the power supply chip U1; the other end of the seventh capacitor C7 is connected with one end of a seventh resistor R7, one end of an eighth resistor R8, one end of a ninth resistor R9 and the FB pin of the power chip U1; the other end of the seventh resistor R7 is connected to one end of a seventh capacitor C7 through an eighth capacitor C8, and the other end of the eighth resistor R8 is connected to the other end of the ninth resistor R9 and a VSEN pin of the power chip U1 through a ninth capacitor C9.

Each resistor-capacitor in the compensation circuit 113 is connected with a corresponding pin of the power chip to form a loop, so as to realize current feedback (such as ISEN3/FB2), perform voltage stabilization compensation on the core voltage, and compensate the switching frequency of the driving signal.

The current monitoring circuit 114 comprises a second thermistor RN2, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12 and a thirteenth capacitor C13; one end of the tenth capacitor C10 is connected with an ISUM + pin of the power supply chip U1, one end of the twelfth capacitor C12 and one end of the thirteenth resistor R13; the other end of the tenth capacitor C10 is connected with one end of a tenth resistor R10, one end of an eleventh capacitor C11 and the ISUM-pin of the power supply chip U1; the other end of the eleventh capacitor C11 is connected to the other end of the tenth resistor R10, the other end of the twelfth capacitor C12 and the other end of the thirteenth resistor R13 through an eleventh resistor R11; one end of the twelfth resistor R12 is connected with one end of the thirteenth resistor R13, the first driving unit and the second driving unit; the other end of the twelfth resistor R12 is connected with one end of the second thermistor RN2, the other end of the second thermistor RN2 is connected with the other end of the thirteenth resistor R13, one end of a thirteenth capacitor C13, the first driving unit and the second driving unit; the other terminal of the thirteenth capacitor C13 is connected to ground.

Each resistor-capacitor in the current monitoring circuit 114 is connected to a corresponding pin of the power chip to sample, filter and RC-match the total current (the sum of the core currents of each driving unit). The second thermistor RN2 is used to detect the temperature near the inductor in the driving unit, and is disposed near the inductor during circuit layout, so that the power chip can adjust the driving signal to perform over-temperature protection when the current is too high and the temperature is abnormal.

The output voltage regulating circuit 115 is provided with 14 resistors, the resistance value of each resistor is preferably 10K Ω, the resistors are welded on the motherboard, but the resistors are temporarily disconnected from the first power end, the ground and the main control circuit 111, specifically: a resistor is respectively arranged between the VID0 pin of the power chip U1 and the ground, between the VID1 pin and the ground, between the VID2 pin and the ground, between the VID3 pin and the ground, between the VID4 pin and the ground, between the VID5 pin and the ground, and between the VID6 pin and the ground (only welding and temporary disconnection); resistors (only welding and not temporarily connecting) are respectively arranged between the VID0 pin of the power supply chip U1 and the first power supply end, between the VID1 pin and the first power supply end, between the VID2 pin and the first power supply end, between the VID3 pin and the first power supply end, between the VID4 pin and the first power supply end, between the VID5 pin and the first power supply end and between the VID6 pin and the first power supply end. See table 1 above, where 0 in VID 0-VID 6 indicates that the resistance between the VID pin and ground needs to be connected, then the voltage of the pin is pulled low; 1 represents that the resistance between the VID pin and the first power supply end needs to be connected, and the voltage of the pin is pulled up to high level; after the resistors are connected, the corresponding pins can be pulled up or pulled down, so that the corresponding voltage parameters can be obtained, and the corresponding CORE voltage VDD _ CORE can be inquired.

It should be understood that although the output voltage regulating circuit 115 has 14 resistors on the motherboard, the connection relationship of the resistors is selected according to the core voltage required by the CPU, which is equivalent to only 7 resistors connected in the finally obtained output voltage regulating circuit 115. Taking this embodiment as an example, if the required CORE voltage VDD _ CORE is 0.8875V, and it can be known from the lookup table 1 that the required voltage parameter is 0110001, the output voltage adjusting circuit 115 includes a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, and a twentieth resistor R20; one end of the fourteenth resistor R14 is connected with the VID0 pin of the power chip U1, and the other end of the fourteenth resistor R14 is connected with one end of the eighteenth resistor R18, one end of the nineteenth resistor R19 and the first power supply end; the fifteenth resistor R15 is connected between the VID1 pin of the power supply chip U1 and the ground, the sixteenth resistor R16 is connected between the VID2 pin of the power supply chip U1 and the ground, the seventeenth resistor R17 is connected between the VID3 pin of the power supply chip U1 and the ground, the eighteenth resistor R18 has the other end connected with the VID4 pin of the power supply chip U1, the nineteenth resistor R19 has the other end connected with the VID5 pin of the power supply chip U1, and the twentieth resistor R20 is connected between the VID6 pin of the power supply chip U1 and the ground.

According to the connection relation, the voltage of VID0 pin is pulled up to high level by R14, which represents 1; the voltage at VID1 pin is pulled low by R15, representing 0; the voltage at VID2 pin is pulled low by R16, representing 0; the voltage at VID3 pin is pulled low by R17, representing 0; the voltage at VID4 pin is pulled high by R18, representing 1; the voltage at VID5 pin is pulled high by R19, representing 1; the VID6 pin is pulled low by R20, indicating a 0. The combination is 0110001, and the CORE voltage VDD _ CORE can reach 0.8875V according to the driving signal output by the combination.

Referring to fig. 3, the first driving unit 121 includes a third switching tube Q3, a fourth switching tube Q4, a fifth switching tube Q5, a first inductor L1, a twenty-first resistor R21, a twenty-second resistor R22, a twenty-third resistor R23, a fourteenth capacitor C14, and a fifteenth capacitor C15; the grid of the third switching tube Q3 is connected with one end of the twenty-first resistor R21 and the UGATE1 pin of the power chip U1; the source of the third switching tube Q3 is connected with the drain of the fourth switching tube Q4, the other end of the twenty-first resistor R21, one end of the fourteenth capacitor C14 and the PHASE1 pin of the power chip U1; the other end of the fourteenth capacitor C14 is connected to a BOOT1 pin of the power chip U1, the drain of the third switching tube Q3 is connected to a fourth power supply terminal, the gate of the fourth switching tube Q4 is connected to the gate of the fifth switching tube Q5 and the LGATE1 pin of the power chip U1, and the source of the fourth switching tube Q4 and the source of the fifth switching tube Q5 are both grounded; the drain of the fifth switch tube Q5 is connected to the drain of the fourth switch tube Q4, one end of a twenty-second resistor R22, one end of a twenty-third resistor R23 and one end of a first inductor L1; the other end of the twenty-second resistor R22 is connected with an ISEN1 pin of the power supply chip U1, and the other end of the twenty-third resistor R23 is connected with one end of a twelfth resistor R12; the other end of the first inductor L1 is connected with one end of a fifteenth capacitor C15, the core power supply end, the other end of the second capacitor C2, the other end of the third capacitor C3 and the other end of the second thermistor RN 2; the other terminal of the fifteenth capacitor C15 is connected to ground.

The third switch tube Q3, the fourth switch tube Q4, and the fifth switch tube Q5 are all NMOS tubes (model number is preferably MDU1514URH), and are turned on when the VGS voltage is high. The third transistor Q3 is a High side field effect transistor (High side MOSFET), and the fourth transistor Q4 and the fifth transistor Q5 are Low side field effect transistors (Low side MOSFET). In the first set of drive signals (UGATE1, BOOT1, PHASE1, LGATE1), the BOOT1 signal is used to boost (the fourteenth capacitor C14 filters the applied voltage), adding the voltage on the BOOT1 signal to the source of Q3. The UGATE1 signal is used for controlling the on-off of the third switch tube Q3, the LGATE1 signal is used for controlling the on-off of the fourth switch tube Q4 and the fifth switch tube Q5, and the UGATE1 signal has the voltage opposite to that of the LGATE1 signal; thus, when the Q3 is switched on, the Q4 and the Q5 are switched off, and the drain electrode of the Q3 outputs high level and outputs high level after being combined with pressurization; when the Q3 is cut off, the Q4 and the Q5 are switched on, the sources of the Q4 and the Q5 output low level, the high level and the low level form a square wave, and the PHASE1 signal is used for adjusting the duty ratio of the square wave. The CORE voltage VDD _ CORE output through the first inductor L1 is an average value obtained by combining the high level and the low level with the duty ratio. Two switching tubes are arranged when outputting low level, so as to increase the loading capacity. The CORE current across the first inductor L1 is sampled by R22 and R23 and a first CORE detect signal (ISEN1 signal, VSUM1 ± signal) is output to the power chip U1 for detecting the first PHASE (PHASE1) power of the CORE voltage VDD _ CORE.

The fifteenth capacitor C15 is used for filtering, so that the output CORE voltage VDD _ CORE is more stable, and in practical implementation, a plurality of capacitors may be connected in parallel between the CORE power supply terminal and ground to increase the filtering effect.

Preferably, in order to protect the Q3-Q5 and make the connection and disconnection more stable, as shown in fig. 3, a capacitor may be connected between the drain of the third switching tube Q3 and ground to filter the fourth voltage + VDC; the grids of the fourth switching tube Q4 and the fifth switching tube Q5 can be grounded through a capacitor respectively to filter the conducting voltage, so that the conduction is more stable; the grids of the third switch tube Q3 and the fourth switch tube Q4 can be respectively connected with corresponding pins of the power chip through a resistor, and the corresponding switch tubes are protected by current limiting through the resistor; the drain of the fifth switch Q5 may be grounded through a resistor and a capacitor in sequence, so that the output CORE voltage VDD _ CORE is more stable.

The first driving unit 121 and the second driving unit 122 have the same circuit structure and the same working principle, except that the second driving unit 122 is connected to the corresponding pin of the power chip U1 through a second set of driving signals (UGATE2, BOOT2, PHASE2, LGATE2), which may specifically refer to fig. 4 and is not described herein.

In summary, the CPU power supply circuit and the terminal device compatible with power supply provided by the utility model are suitable for a motherboard whose CPU core only supports fixed voltage power supply, can set voltage parameters according to the core voltage required by the CPU, output corresponding driving signals to control the on-off of an internal core power supply path during subsequent work, and output the core voltage corresponding to the voltage parameters, and only one CPU power supply circuit is needed to meet different power supply requirements of different CPUs, thereby greatly improving the compatibility of the CPU power supply circuit; meanwhile, the voltage regulating value of each stage is 12.5mV, and the adjustable range is 0-1.5V, so that the power supply requirement is met. The core voltage can be output in a single phase (only one driving unit works) or a double phase (two driving units work simultaneously) according to application requirements and loading capacity, and the core voltage has the protection functions of overcurrent, undervoltage, overvoltage, overtemperature and the like, and is stable in performance and high in safety. Meanwhile, the number of circuit components is small, and the occupied PCB space is small; the circuit is simple, and the Layout difficulty of the PCB circuit Layout is low; the circuit has strong universality, can meet the core compatible power supply of CPUs of different models, and has stable performance and high safety.

The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A CPU power supply circuit compatible with power supply is connected with a CPU and is characterized by comprising a control module and a driving module; the driving module is connected with the control module and the CPU;

when the control module detects starting, the currently set voltage parameter is acquired and a corresponding driving signal is generated; the driving module controls the on-off of a core power supply path according to the driving signal and outputs a core voltage corresponding to the voltage parameter to supply power to the CPU;

the control module comprises a main control circuit, a starting circuit, a compensation circuit, a current monitoring circuit and an output voltage regulating circuit; the starting circuit, the compensation circuit, the current monitoring circuit and the output voltage regulating circuit are all connected with the main control circuit; the main control circuit is connected with the driving module;

2. The CPU power supply circuit compatible with power supply of claim 1, wherein the driving module comprises a first driving unit and a second driving unit, the first driving unit is connected with the main control circuit and the CPU, the second driving unit is connected with the main control circuit and the CPU, and the first driving unit is connected with the second driving unit;

3. The CPU power supply circuit compatible with power supply of claim 2, wherein the main control circuit comprises a power supply chip, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a first resistor, a second resistor and a first thermistor;

4. The CPU power supply circuit compatible with power supply of claim 3, wherein the starting circuit comprises a first switch tube, a second switch tube, a third resistor, a fourth resistor and a fifth resistor;

5. The CPU power supply circuit compatible with power supply of claim 4, wherein the compensation circuit comprises a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, a fifth capacitor, a sixth capacitor, a seventh capacitor, an eighth capacitor and a ninth capacitor;

6. The power-compatible CPU power supply circuit of claim 5 wherein the current monitoring circuit comprises a second thermistor, a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, and a thirteenth capacitor;

7. The power supply compatible CPU power supply circuit of claim 6 wherein the output voltage regulation circuit comprises a fourteenth resistor, a fifteenth resistor, a sixteenth resistor, a seventeenth resistor, an eighteenth resistor, a nineteenth resistor, and a twentieth resistor;

8. The CPU power supply circuit compatible with power supply of claim 7, wherein the first driving unit comprises a third switching tube, a fourth switching tube, a fifth switching tube, a first inductor, a twenty-first resistor, a twenty-second resistor, a twenty-third resistor, a fourteenth capacitor and a fifteenth capacitor; the grid electrode of the third switching tube is connected with one end of the twenty-first resistor and the UGATE1 pin of the power chip; the source electrode of the third switching tube is connected with the drain electrode of the fourth switching tube, the other end of the twenty-first resistor, one end of the fourteenth capacitor and the PHASE1 pin of the power supply chip; the other end of the fourteenth capacitor is connected with a BOOT1 pin of the power chip, the drain electrode of the third switching tube is connected with a fourth power supply end, the grid electrode of the fourth switching tube is connected with the grid electrode of the fifth switching tube and an LGATE1 pin of the power chip, and the source electrode of the fourth switching tube and the source electrode of the fifth switching tube are both grounded; the drain electrode of the fifth switching tube is connected with the drain electrode of the fourth switching tube, one end of the twenty-second resistor, one end of the twenty-third resistor and one end of the first inductor; the other end of the twenty-second resistor is connected with an ISEN1 pin of the power supply chip, and the other end of the twenty-third resistor is connected with one end of the twelfth resistor; the other end of the first inductor is connected with one end of a fifteenth capacitor, the core power supply end, the other end of the second capacitor, the other end of the third capacitor and the other end of the second thermistor; the other terminal of the fifteenth capacitor is connected to ground.

9. A terminal device, comprising a main board, wherein the main board is provided with a CPU, and further provided with a power supply circuit of the CPU compatible with power supply according to any one of claims 1 to 8; the CPU power supply circuit compatible with power supply is connected with the CPU;