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WO2022178718A1 - Circuit d'alimentation électrique poe-vers-usb et convertisseur usb - Google Patents

Circuit d'alimentation électrique poe-vers-usb et convertisseur usb Download PDF

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Publication number
WO2022178718A1
WO2022178718A1 PCT/CN2021/077687 CN2021077687W WO2022178718A1 WO 2022178718 A1 WO2022178718 A1 WO 2022178718A1 CN 2021077687 W CN2021077687 W CN 2021077687W WO 2022178718 A1 WO2022178718 A1 WO 2022178718A1
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WO
WIPO (PCT)
Prior art keywords
circuit
resistor
usb
voltage
power supply
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2021/077687
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English (en)
Chinese (zh)
Inventor
廖卓文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Guangdong Gopod Group Holding Co Ltd
Original Assignee
Guangdong Gopod Group Holding Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Guangdong Gopod Group Holding Co Ltd filed Critical Guangdong Gopod Group Holding Co Ltd
Priority to PCT/CN2021/077687 priority Critical patent/WO2022178718A1/fr
Priority to CN202190000026.XU priority patent/CN215990568U/zh
Publication of WO2022178718A1 publication Critical patent/WO2022178718A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/02—Details
    • H04L12/10—Current supply arrangements

Definitions

  • the application belongs to the field of power conversion, and in particular relates to a POE-to-USB power supply circuit and a USB converter.
  • the traditional USB converter can convert between network data signals and Universal Serial Bus (USB) data signals, so that the terminal device can be connected to the network through the USB converter, but the traditional USB converter can only connect from the terminal
  • USB Universal Serial Bus
  • the device can work normally only when the device is powered or powered by a power adapter. When the user needs to charge the terminal device, an additional power adapter needs to be carried.
  • the purpose of the embodiments of the present application is to provide a POE-to-USB PD power supply circuit and a USB converter, which are intended to solve the problems that the traditional USB converter circuit has a complex structure and is cumbersome to use.
  • an embodiment of the present application provides a POE-to-USB power supply circuit, including:
  • a power conversion circuit configured to convert the POE voltage into a first voltage when the POE voltage is connected
  • a first step-down circuit connected to the power conversion circuit, and configured to convert the first voltage into the USB charging voltage of different levels according to the logic state of the first control signal; wherein the first control signal having multiple logic states, the USB charging voltage has multiple levels, and each of the logic states corresponds to one of the levels;
  • a first detection circuit connected to the first step-down circuit, configured to detect the USB charging voltage to output a first sampling voltage
  • the PD protocol circuit is connected to the first step-down voltage and the first detection circuit, and is configured to output the first control signal according to the first sampling voltage and the configuration channel signal.
  • it also includes:
  • a network interface connected to the power conversion circuit, configured to transfer the POE voltage
  • the first USB interface is connected to the first detection circuit, the first step-down circuit and the PD protocol circuit, and is configured to transfer the configuration channel signal and the USB charging voltage.
  • the network interface is further configured to transfer network data signals
  • the first USB interface is further configured to transfer a first TYPE-C data signal;
  • the first TYPE-C data signal includes a first USB data signal and a first DP signal;
  • the POE to USB power supply circuit further includes:
  • a data signal conversion circuit connected to the network interface and the first USB interface, is configured to convert the network data signal into the first USB data signal.
  • the data signal conversion circuit includes:
  • a network data conversion component connected to the network interface, configured to convert the network data signal into a second USB data signal
  • a switch component connected to the network data conversion component and the first USB interface, is configured to convert the second USB data signal into the first USB data signal.
  • the switch assembly is further connected with the PD protocol circuit
  • the first USB interface is also configured to transfer positive and negative insertion detection signals
  • the PD protocol circuit is further configured to output a forward and reverse insertion control signal according to the forward and reverse insertion detection signal;
  • the switch assembly is specifically configured to convert the second USB data signal into the first USB data signal according to the forward and reverse insertion control signal.
  • the data signal conversion circuit further includes:
  • a second USB interface connected to the network data conversion component, configured to access a third USB data signal
  • the network data conversion component is specifically configured to convert the third USB data signal and the network data signal into the second USB data signal.
  • the data signal conversion circuit further includes:
  • a memory card conversion component connected to the network data conversion component, configured to access the memory card signal, and convert the memory card signal into a fourth USB signal;
  • the network data conversion component is specifically configured to convert the fourth USB data signal and the network data signal into the second USB data signal.
  • the switch assembly is further configured to convert the first DP signal to the second DP signal
  • the data signal conversion circuit also includes:
  • a video signal conversion component connected to the switch component, is configured to convert the second DP signal into an HDMI signal.
  • the PD protocol circuit is further configured to output a second control signal and a third control signal according to the first sampling signal;
  • the POE to USB power supply circuit further includes:
  • a first switch circuit connected to the first step-down circuit, the first detection circuit and the PD protocol circuit, and configured to switch the USB charging voltage according to the second control signal;
  • a second switch circuit connected to the first USB interface and the second switch circuit, and configured to switch the USB charging voltage according to the third control signal
  • a second step-down circuit connected to the first switch circuit, the second switch circuit, the PD protocol circuit and the data signal conversion circuit, is configured to convert the USB charging voltage into a power supply voltage, so as to The PD protocol circuit and the data signal conversion circuit are powered.
  • the first USB interface is further configured to switch the USB power supply voltage;
  • the PD protocol circuit is further configured to stop outputting all the samples when the first sampling voltage is stopped and the second sampling voltage is input. the second control signal and output the third control signal;
  • the POE to USB power supply circuit further includes:
  • a second detection circuit connected to the first USB interface, the second switch circuit and the PD protocol circuit, and configured to detect the USB power supply voltage to output a second sampling voltage
  • the second switch circuit is further configured to switch the USB power supply voltage according to the third control signal
  • the second step-down circuit is further configured to convert the USB power supply voltage into the power supply voltage to power the PD protocol circuit and the data signal conversion circuit.
  • the PD protocol circuit includes a PD protocol chip and a first capacitor
  • the power supply terminal of the PD protocol chip and the first terminal of the first capacitor are jointly connected to the power supply voltage input terminal of the PD protocol circuit, and the first charging slave device configuration terminal of the PD protocol chip and the PD protocol
  • the second charging slave device configuration end of the chip is commonly connected to the configuration channel signal input end of the PD protocol circuit, and the USB charging slave device power supply voltage detection end of the PD protocol chip is connected to the second sampling voltage of the PD protocol circuit
  • the first step-down circuit includes a synchronous step-down converter, a first field effect transistor, a second field effect transistor, a third field effect transistor, a first inductor, a second capacitor, and a third capacitor , the fourth capacitor, the fifth capacitor, the sixth capacitor, the first resistor, the second resistor, the third resistor, the fourth resistor, the fifth resistor, the sixth resistor, the seventh resistor, the eighth resistor, the ninth resistor, the first resistor Ten resistors, eleventh resistors, twelfth resistors, thirteenth resistors, fourteenth resistors and fifteenth resistors;
  • the power supply voltage terminal of the synchronous step-down converter, the first terminal of the second capacitor and the first terminal of the first resistor are jointly connected to the POE voltage input terminal of the first step-down circuit.
  • the enable terminal of the buck converter is connected to the second terminal of the first resistor and the first terminal of the second resistor, and the power good output terminal of the synchronous buck converter is connected to the connection of the third resistor.
  • the first end is connected, and the internal LDO regulator end of the synchronous buck converter is connected to the second end of the third resistor, the first end of the third capacitor, the first end of the fourth resistor, and the The first end of the fifth resistor is connected to the first end of the eleventh resistor, the first feedback reference voltage selection end of the synchronous buck converter is connected to the second end of the fourth resistor, the The first end of the six resistors is connected to the first end of the seventh resistor, the second end of the sixth resistor R6 is connected to the drain of the first field effect transistor, and the gate of the first field effect transistor is connected pole, the gate of the second field effect transistor and the gate of the third field effect transistor are commonly connected to the first control signal input end of the first step-down circuit, and the second end of the seventh resistor is connected to the drain of the second field effect transistor, the second feedback reference voltage selection end of the synchronous buck converter is connected to the first end of the fifth resistor and the first end of the eighth resistor, The second end of the eighth resistor
  • both the first switch circuit and the second switch circuit include switch components, and the switch components include a fourth field effect transistor, a fifth field effect transistor, a seventh capacitor, an eighth capacitor, and a tenth Sixth resistor, seventeenth resistor and eighteenth resistor;
  • the gate of the fifth field effect transistor and the first end of the eighteenth resistor are commonly connected to the control terminal of the switch component, and the drain of the fifth field effect transistor and the sixteenth resistor are connected together.
  • the first end is connected to the first end of the seventeenth resistor
  • the second end of the sixteenth resistor is connected to the first end of the eighth capacitor and the gate of the fourth field effect transistor, so
  • the drain of the fourth field effect transistor and the first terminal of the seventh capacitor are connected to the first input and output terminals of the switch component, and the source of the fourth field effect transistor and the first terminal of the eighth capacitor are connected.
  • the two terminals and the second terminal of the seventeenth resistor are commonly connected to the second input and output terminals of the switch assembly, and the source of the fifth field effect transistor and the second terminal of the eighteenth resistor are commonly connected Connect to power ground.
  • an embodiment of the present invention further provides a USB converter, where the USB converter includes the above-mentioned POE-to-USB power supply circuit.
  • the beneficial effect of the POE-to-USB power supply circuit is that: since the POE voltage is converted into the first voltage and the first voltage is converted into the USB charging voltage, the external terminal equipment can be charged through the POE voltage, namely The terminal device can be charged through the POE network, which is convenient for users to use; and the first control signals of different logic states can be set according to different configuration channel signals, and the USB of different levels can be output according to the first control signals of different logic states.
  • the power supply voltage realizes the output of various USB power supply voltages.
  • FIG. 1 is a schematic structural diagram of a POE-to-USB power supply circuit provided by an embodiment of the present application
  • FIG. 2 is another schematic structural diagram of a POE-to-USB power supply circuit provided by an embodiment of the present application
  • FIG. 3 is another schematic structural diagram of a POE-to-USB power supply circuit provided by an embodiment of the present application.
  • FIG. 4 is a schematic structural diagram of a data signal conversion circuit in a POE-to-USB power supply circuit provided by an embodiment of the present application;
  • FIG. 5 is another schematic structural diagram of a data signal conversion circuit in a POE-to-USB power supply circuit provided by an embodiment of the present application;
  • FIG. 6 is another schematic structural diagram of a data signal conversion circuit in a POE-to-USB power supply circuit provided by an embodiment of the present application;
  • FIG. 7 is another schematic structural diagram of a data signal conversion circuit in a POE-to-USB power supply circuit provided by an embodiment of the present application.
  • FIG. 8 is another schematic structural diagram of a POE-to-USB power supply circuit provided by an embodiment of the present application.
  • FIG. 9 is another schematic structural diagram of a POE-to-USB power supply circuit provided by an embodiment of the present application.
  • FIG. 10 is an exemplary circuit schematic diagram of a POE-to-USB power supply circuit provided by an embodiment of the present application.
  • first and second are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, a feature defined as “first” or “second” may expressly or implicitly include one or more of that feature.
  • plurality means two or more, unless otherwise expressly and specifically defined.
  • FIG. 1 shows a schematic structural diagram of a POE-to-USB power supply circuit provided by a preferred embodiment of the present application. For the convenience of description, only the part related to this embodiment is shown, and the details are as follows:
  • the above POE to USB power supply circuit includes a power conversion circuit 11 , a first step-down circuit 12 , a first detection circuit 13 and a PD protocol circuit 14 .
  • the power conversion circuit 11 is configured to convert the POE voltage into a first voltage when the power over Ethernet (Power Over Ethernet, POE) voltage is connected;
  • the first step-down circuit 12 connected to the power conversion circuit 11, is configured to convert the first voltage into USB charging voltages of different levels according to the logic state of the first control signal; wherein the first control signal has multiple logic states, and the USB The charging voltage has multiple levels, and each logic state corresponds to one of the levels; the first step-down circuit 12 is specifically configured to convert the first voltage into a USB charging voltage, and then according to the logic state of the first control signal The first voltage is converted into USB charging voltages of different levels.
  • the first detection circuit 13, connected to the first step-down circuit 12, is configured to detect the universal serial bus (Universal Serial Bus, USB) charging voltage to output the first sampling voltage;
  • USB Universal Serial Bus
  • the power delivery (Power Delivery, PD) protocol circuit is connected to the first step-down voltage and the first detection circuit 13, and is configured to output the first control signal according to the first sampled voltage and the configuration channel signal.
  • the USB power supply circuit may be a USB PD power supply circuit
  • the USB charging voltage may be a USB PD charging voltage
  • the above-mentioned POE-to-USB power supply circuit further includes a network interface 15 and a first USB interface 16 .
  • the network interface 15 is connected to the power conversion circuit 11, and is configured to switch the POE voltage
  • the first USB interface 16 is connected to the first detection circuit 13 , the first step-down circuit 12 and the PD protocol circuit 14 , and is configured to transfer the configuration channel signal and the USB charging voltage.
  • the network interface 15 is also configured to transfer network data signals; the first USB interface 16 is also configured to transfer the first TYPE-C data signal; the first TYPE-C data signal includes the first USB data signal and the first USB data signal.
  • High-definition digital display interface (DisplayPort, DP) signal is also configured to transfer network data signals; the first USB interface 16 is also configured to transfer the first TYPE-C data signal; the first TYPE-C data signal includes the first USB data signal and the first USB data signal.
  • High-definition digital display interface (DisplayPort, DP) signal DisplayPort, DP
  • the POE to USB power supply circuit further includes a data signal conversion circuit 17 .
  • the data signal conversion circuit 17, connected to the network interface 15 and the first USB interface 16, is configured to convert the network data signal into the first USB data signal.
  • the network data signal is converted into the first USB data signal through the data signal conversion circuit 17, which enriches the functions of the product.
  • the data signal conversion circuit 17 includes a network data conversion component 171 and a switch component 172 .
  • a network data conversion component 171 connected to the network interface 15, and configured to convert the network data signal into the second USB data signal;
  • the switch component 172 connected to the network data conversion component 171 and the first USB interface 16, is configured to convert the second USB data signal into a USB data signal.
  • the switch component 172 can also be connected to the PD protocol circuit 14; the first USB interface 16 is further configured to transfer the positive and negative insertion detection signal; the PD protocol circuit 14 is further configured to detect the positive and negative insertion according to the signal. Outputting a forward and reverse insertion control signal; the switch component 172 is specifically configured to convert the second USB data signal into the first USB data signal according to the forward and reverse insertion control signal.
  • the first USB interface can work normally under both forward and reverse insertion, which enriches the functions of the product.
  • the data signal conversion circuit 17 further includes a second USB interface 173 .
  • the second USB interface 173 is connected to the network data conversion component 171 and is configured to access the third USB data signal.
  • the network data conversion component 171 is specifically configured to convert the third USB data signal and the network data signal into the second USB data signal.
  • the data signal conversion circuit 17 also includes a memory card conversion component 174 .
  • the memory card conversion component 174 connected to the network data conversion component 171, is configured to access the memory card signal, and convert the memory card signal into a fourth USB signal.
  • the network data conversion component 171 is specifically configured to convert the fourth USB data signal and the network data signal into the second USB data signal.
  • the switch component 172 is further configured to convert the first DP signal into the second DP signal; the data signal conversion circuit 17 further includes a video signal conversion component 175 .
  • the video signal conversion component 175 is connected to the switch component 172, and is configured to convert the second DP signal into a high definition multimedia interface (High Definition Multimedia Interface). Interface, HDMI) signal.
  • High Definition Multimedia Interface High Definition Multimedia Interface
  • HDMI High Definition Multimedia Interface
  • the second USB data signal can be converted into a plurality of first USB data signals through the USB data signal conversion component, which expands the first USB interface 16 .
  • the PD protocol circuit 14 is further configured to output a second control signal and a third control signal according to the first sampling signal; as shown in FIG. 8 , the POE to USB power supply circuit further includes a first switch circuit 18 , a second switch circuit 19 and a second switch circuit 18 . step-down circuit 20 .
  • the first switch circuit 18 is connected to the first step-down circuit 12, the first detection circuit 13 and the PD protocol circuit 14, and is configured to switch the USB charging voltage according to the second control signal;
  • the second switch circuit 19 is connected to the first USB interface 16 and the second switch circuit 19, and is configured to switch the USB charging voltage according to the third control signal;
  • the second step-down circuit 20 is connected to the first switch circuit 18 , the second switch circuit 19 , the PD protocol circuit 14 and the data signal conversion circuit 17 , and is configured to convert the USB charging voltage into a power supply voltage, so as to convert the PD protocol circuit 14 and the data signal conversion circuit 17 into a power supply voltage.
  • the data signal conversion circuit 17 supplies power.
  • the power supply of the internal function modules is realized, and the additional power supply of the energy storage module is avoided.
  • the first USB interface 16 is further configured to switch the USB power supply voltage; the PD protocol circuit 14 is further configured to stop outputting the second control signal and output the third control signal when the first sampling voltage is stopped and the second sampling voltage is input; such as As shown in FIG. 9 , the POE-to-USB power supply circuit further includes a second detection circuit 21 .
  • the second detection circuit 21 is connected to the first USB interface 16, the second switch circuit 19 and the PD protocol circuit 14, and is configured to detect the USB power supply voltage to output the second sampling voltage;
  • the second switch circuit 19 is further configured to switch the USB power supply voltage according to the third control signal
  • the second step-down circuit 20 is further configured to convert the USB power supply voltage into a power supply voltage to supply power to the PD protocol circuit 14 and the data signal conversion circuit 17 .
  • the USB power supply voltage is converted into a power supply voltage by the second step-down circuit 20, so as to supply power to the internal function modules when the POE voltage is stopped, and avoid additionally setting an energy storage module for power supply.
  • FIG. 10 shows an example circuit structure of the POE-to-USB power supply circuit provided by the embodiment of the present invention. For the convenience of description, only the part related to the embodiment of the present invention is shown, and the details are as follows:
  • the PD protocol circuit 14 includes a PD protocol chip U1 and a first capacitor C1;
  • the power supply terminal VDD of the PD protocol chip U1 and the first terminal of the first capacitor C1 are jointly connected to the power supply voltage input terminal of the PD protocol circuit 14 , the first charging slave device configuration terminal CC1U of the PD protocol chip U1 and the first charging terminal of the PD protocol chip U1
  • the two charging slave device configuration terminals CC2U are jointly connected to the configuration channel signal input terminal of the PD protocol circuit 14, and the USB charging slave device power supply voltage detection terminal VBUS_DET1 of the PD protocol chip U1 is connected to the PD protocol circuit 14.
  • the second sampling voltage input terminal, PD The USB host device power supply voltage detection terminal VBUS_DET2 of the protocol chip U1 is connected to the first sampling voltage input terminal of the PD protocol circuit 14, the first general-purpose input and output terminal GPIO4 of the PD protocol chip U1, and the second general-purpose input and output terminal of the PD protocol chip U1.
  • GPIO5 and the third general-purpose input and output terminal GPIO10 of the PD protocol chip U1 are jointly connected to the first control signal output terminal of the PD protocol circuit 14, and the fourth general-purpose input and output terminal GPIO3 of the PD protocol chip U1 is connected to the second of the PD protocol circuit 14.
  • the fifth general input and output end GPIO1 of the PD protocol chip U1 is connected to the third control signal output end of the PD protocol circuit 14 , and the second end of the first capacitor C1 is connected to the power ground.
  • the PD protocol circuit 14 can output different control signals according to the first sampling voltage of the USB power supply voltage and the second sampling voltage of the USB charging voltage, respectively, and supports two working modes of accessing the POE voltage or accessing the USB charging voltage; and can Different first control signals are set according to different configuration channel signals, thereby realizing the output of various USB power supply voltages.
  • the first step-down circuit 12 includes a synchronous step-down converter U2, a first field effect transistor M1, a second field effect transistor M2, a third field effect transistor M3, a first inductor L1, a second capacitor C2, a third capacitor C3,
  • the power supply voltage terminal IN of the synchronous buck converter U2, the first end of the second capacitor C2 and the first end of the first resistor R1 are jointly connected to the first voltage input terminal of the first buck circuit 12, and the synchronous buck converter
  • the enable terminal EN of U2 is connected to the second terminal of the first resistor R1 and the first terminal of the second resistor R2
  • the power good output terminal PG of the synchronous buck converter U2 is connected to the first terminal of the third resistor R3,
  • the first terminal of the eleventh resistor R11 is connected to the first feedback reference voltage selection terminal VSEL1 of the synchronous buck converter U2 with the second terminal of the fourth resistor R4, the first terminal of the sixth resistor R6 and the terminal of the seventh resistor R7.
  • the first end is connected, the second end of the sixth resistor R6 is connected to the drain of the first field effect transistor M1, the gate of the first field effect transistor M1, the gate of the second field effect transistor M2 and the third field effect transistor
  • the gate of M3 is commonly connected to the first control signal input end of the first step-down circuit 12
  • the second end of the seventh resistor R7 is connected to the drain of the second field effect transistor M2
  • the feedback reference voltage selection terminal VSEL2 is connected to the first end of the fifth resistor R5 and the first end of the eighth resistor R8, the second end of the eighth resistor R8 is connected to the drain of the third field effect transistor M3, and the synchronous step-down conversion
  • the bootstrap end BST of the device U2 is connected to the first end of the ninth resistor R9, the second end of the ninth resistor R9 is connected to the first end of the fourth capacitor C4, and the second end of the fourth capacitor C4 is connected to the synchronous step-down conversion
  • the synchronous step-down converter U2 has multiple feedback reference voltage selection terminals, and realizes the output of multiple USB power supply voltages.
  • Both the first switch circuit 18 and the second switch circuit 19 include switch components, and the switch components include a fourth field effect transistor M4, a fifth field effect transistor M5, a seventh capacitor C7, an eighth capacitor C8, a sixteenth resistor R16, a sixth The seventeenth resistor R17 and the eighteenth resistor R18;
  • the gate of the fifth field effect transistor M5 and the first end of the eighteenth resistor R18 are commonly connected to the control end of the switch component, and the drain of the fifth field effect transistor M5 and the first and tenth ends of the sixteenth resistor R16
  • the first end of the seventh resistor R17 is connected
  • the second end of the sixteenth resistor R16 is connected to the first end of the eighth capacitor C8 and the gate of the fourth field effect transistor M4
  • the drain of the fourth field effect transistor M4 is connected to the first end of the eighth capacitor C8 and the gate of the fourth field effect transistor M4.
  • the first end of the seventh capacitor C7 is connected to the first input and output end of the switch assembly, and the source of the fourth field effect transistor M4, the second end of the eighth capacitor C8 and the second end of the seventeenth resistor R17 are jointly connected to the switch
  • the second input and output ends of the component are connected, and the source electrode of the fifth field effect transistor M5 and the second end of the eighteenth resistor R18 are commonly connected to the power supply ground.
  • the circuit of the switch assembly is simple and reliable.
  • the POE to USB power supply circuit has two working states.
  • the network interface 15 is connected to the POE voltage
  • the power conversion circuit 11 converts the POE voltage into the first voltage
  • the power supply voltage terminal IN of the synchronous buck converter U2 inputs the first voltage
  • the synchronous buck converter U2 converts the first voltage into a USB charging voltage and outputs it from the switch output terminal SW of the synchronous buck converter U2 and filters it through the first inductor L1
  • the first detection circuit 13 detects the USB charging voltage to output a first sampling voltage
  • the USB host device power supply voltage detection terminal VBUS_DET2 of the PD protocol chip U1 the first charging slave device configuration terminal CC1U of the PD protocol chip U1 and the second charging slave device configuration terminal CC2U of the PD protocol chip U1 input the configuration channel signal
  • PD protocol chip U1 outputs the first control signal according to the first sampling voltage and the configuration channel signal, and outputs the first control signal from the first general-purpose input and output terminal GPIO4 of the PD protocol chip U1, the second general-purpose input and output
  • the output of the general-purpose input and output terminal GPIO10, the second feedback reference voltage selection terminal VSEL2 of the synchronous buck converter U2 and the first feedback reference voltage selection terminal VSEL1 of the synchronous buck converter U2 are set to different according to different logic states of the first control signal.
  • the synchronous buck converter U2 converts the first voltage into USB charging voltages of different levels according to the above-mentioned different voltage states; that is, various logic states correspond to various levels one-to-one, as shown in the following table. In the table, VOUT is the USB power supply voltage.
  • the PD protocol chip U1 also outputs the second control signal from the fourth general-purpose input and output terminal GPIO3 of the PD protocol chip U1 according to the first sampling signal, and outputs the third control signal from the fifth general-purpose input and output terminal GPIO1 of the PD protocol chip U1; the first The fourth field effect transistor M4 and the fifth field effect transistor M5 in the switch circuit 18 switch the USB charging voltage according to the second control signal; the fourth field effect transistor M4 and the fifth field effect transistor M5 in the second switch circuit 19 are based on The third control signal transfers the USB charging voltage; the first USB interface 16 transfers the above-mentioned USB charging voltage.
  • the second step-down circuit 20 converts the USB charging voltage into a power supply voltage to supply power to the PD protocol circuit 14 and the data signal conversion circuit 17 .
  • the network interface 15 stops connecting to the POE voltage and the first USB interface 16 connects to the USB power supply voltage
  • the PD protocol chip U1 stops inputting the first sampling voltage and supplies power from the USB charging slave device of the PD protocol chip U1
  • the voltage detection terminal VBUS_DET1 inputs the second sampling voltage
  • the PD protocol chip U1 stops outputting the second control signal according to the second sampling voltage and outputs the third control signal from the fifth general-purpose input and output terminal GPIO1 of the PD protocol chip U1;
  • the second switch circuit 19 The fourth field effect transistor M4 and the fifth field effect transistor M5 switch the USB power supply voltage according to the third control signal;
  • the second step-down circuit 20 converts the USB power supply voltage into a power supply voltage, so as to convert the PD protocol circuit 14 and the data signal.
  • the conversion circuit 17 supplies power.
  • An embodiment of the present application further provides a USB converter, where the USB converter includes the above POE-to-USB power supply circuit.
  • the POE voltage when the POE voltage is connected to the power conversion circuit, the POE voltage is converted into the first voltage; the first step-down circuit will convert the first voltage into the USB charging voltage according to the first control signal; wherein the first voltage The control signal has multiple logic states, the USB charging voltage has multiple levels, and each logic state corresponds to a level; the first detection circuit detects the USB charging voltage to output the first sampling voltage; the PD protocol circuit is based on The first sampling voltage and the configuration channel signal output the first control signal; since the POE voltage is converted into the first voltage and the first voltage is converted into the USB charging voltage, the external terminal equipment can be charged through the POE voltage, and can be charged according to the Different configuration channel signals set first control signals of different logic states, and output USB power supply voltages of different levels according to the first control signals of different logic states, thereby realizing the output of various USB power supply voltages.

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Abstract

L'invention concerne un circuit d'alimentation électrique POE-vers-USB et un convertisseur USB. Lorsqu'une tension de POE est connectée, la tension de POE est convertie en une première tension au moyen d'un circuit de conversion de source d'alimentation (11) ; un premier circuit abaisseur (12) convertit la première tension en une tension de charge USB selon un premier signal de commande, le premier signal de commande ayant de multiples états logiques, la tension de charge USB ayant de multiples niveaux, et chaque état logique correspondant à un niveau ; un premier circuit de mesure (13) mesure la tension de charge USB pour délivrer une première tension d'échantillonnage ; et selon la première tension d'échantillonnage et un signal de canal de configuration, un circuit de protocole PD (14) délivre le premier signal de commande. Une tension de POE est convertie en une première tension, et la première tension est convertie en une tension de charge USB, de telle sorte qu'un dispositif terminal est chargé au moyen d'un réseau de POE ; et un premier signal de commande ayant différents états logiques peut être défini, et une tension de charge USB ayant différents niveaux est délivrée en fonction du premier signal de commande ayant des états logiques différents, de telle sorte que de multiples tensions de charge USB sont délivrées.
PCT/CN2021/077687 2021-02-24 2021-02-24 Circuit d'alimentation électrique poe-vers-usb et convertisseur usb Ceased WO2022178718A1 (fr)

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CN202190000026.XU CN215990568U (zh) 2021-02-24 2021-02-24 Poe转usb供电电路及usb转换器

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CN117215974A (zh) * 2023-05-11 2023-12-12 深圳市华卓智能科技有限公司 一种解决usb3.0传输问题电路
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