CN105739583A - Power supply circuit - Google Patents
Power supply circuit Download PDFInfo
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- CN105739583A CN105739583A CN201410732834.1A CN201410732834A CN105739583A CN 105739583 A CN105739583 A CN 105739583A CN 201410732834 A CN201410732834 A CN 201410732834A CN 105739583 A CN105739583 A CN 105739583A
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- 239000003990 capacitor Substances 0.000 claims abstract description 83
- 230000006837 decompression Effects 0.000 claims description 40
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 30
- 229910052710 silicon Inorganic materials 0.000 claims description 30
- 239000010703 silicon Substances 0.000 claims description 30
- 230000005611 electricity Effects 0.000 claims description 16
- 230000036772 blood pressure Effects 0.000 claims description 8
- 238000001914 filtration Methods 0.000 claims description 5
- 230000000087 stabilizing effect Effects 0.000 abstract description 6
- 101100365087 Arabidopsis thaliana SCRA gene Proteins 0.000 abstract description 3
- 101150105073 SCR1 gene Proteins 0.000 abstract description 3
- 101100134054 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) NTG1 gene Proteins 0.000 abstract description 3
- 238000010304 firing Methods 0.000 abstract 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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Abstract
Provided is a power supply circuit, comprising a control chip, a standby circuit connected with the control chip to supply power to the control chip, and a load power supply circuit connected with the control chip. The load power supply circuit comprises a switching circuit which is connected with a controllable power supply and switches on/off according to setting, a load step-down circuit, a load voltage stabilizing circuit, and a load starting circuit. The switching circuit comprises a high-level single-direction connecting single-direction thyristor SCR1. The load voltage stabilizing circuit comprises a voltage-regulator tube DW1 which is connected on two ends of a load in parallel. The load starting circuit comprises a polar capacitor E1 which is connected on two ends of a load in parallel. The load step-down circuit comprises a load step-down resistor which is connected with an electric supply firing line, a step-down capacitor C1, and a diode D2 connected with the polar capacitor E1 in parallel. The power supply of the load power supply circuit is controllable. Through controlling breakover of the single-direction thyristor SCR1, the load power supply circuit can be controlled not to operate in standing by, and operate only when required, so that a requirement of reducing standby power consumption is realized.
Description
Technical field
The present invention relates to power supply circuits, particularly relate to a kind of capacitance-resistance power supply circuits.
Background technology
Capacitance-resistance voltage reduction circuit is that one is similar to constant current source power supply circuit, capacitance-resistance voltage reduction circuit product standby with work shape
State, power consumption is the same.Thus can not meet the energy consumption standard when standby, also be the waste of a kind of energy simultaneously.Order
Before to have a solution be the power circuit adopting small-sized single-chip switching power supply chip, treat although this power circuit solves
Machine power problems, but its cost high and high-voltage electrolytic capacitor service life be also distinct issues.
Summary of the invention
The purpose of the present invention:A kind of power supply circuits that can reduce power consumption are provided.
To achieve these goals, the technical scheme is thatA kind of power supply circuits, including: control chip is connected the stand-by circuit supplying electricity to control chip and the load supplying circuit being connected with control chip with control chip, and described load supplying circuit includes: be connected with the I/O end of described control chip and according to arranging the on-off circuit and load step-down circuit, load mu balanced circuit, the load starting circuit that carry out turning on；Described on-off circuit includes the unidirectional controllable silicon S CR1 of high level one-way conduction, described load mu balanced circuit includes the stabilivolt DW1 being connected in parallel on load two ends, described load starting circuit includes the polar capacitor E1 being connected in parallel on load two ends, described load step-down circuit includes the load step-down resistance, decompression capacitor C1 and the diode D2 in parallel with polar capacitor E1 that are connected on civil power live wire, and described load step-down resistance input is linked into the live wire end of civil power, its outfan is linked into one end of decompression capacitor C1；Described diode D2 negative pole accesses in the other end of decompression capacitor C1 and the positive pole of polar capacitor E1, and the positive pole of diode D2 is linked into the common port of the negative electrode of unidirectional controllable silicon S CR1 and the zero line side of civil power and earth terminal；The pole that controls of unidirectional controllable silicon S CR1 is linked into the I/O end of control chip, and the anode of unidirectional controllable silicon S CR1 is linked into the negative pole of polar capacitor E1.
In a preferred embodiment, described load step-down resistance includes dropping resistor R1.
In a preferred embodiment, it is additionally provided with electricity between control pole and the control chip of described unidirectional controllable silicon S CR1
Resistance R3.
In a preferred embodiment, described load supplying circuit also includes the electric discharge electricity in parallel with decompression capacitor C1 two ends
Resistance R2.
In a preferred embodiment, described stand-by circuit includes: standby reduction voltage circuit, standby mu balanced circuit, standby rectification
Circuit and standby filter circuit；Supplying electricity to control chip after the filtering of described standby filter circuit, described standby mu balanced circuit includes
Zener diode DW2, described standby rectification circuit includes commutation diode D1, and described filter circuit includes polarity filter capacitor
E2, the input of described standby reduction voltage circuit is linked into the live wire end of civil power, its outfan is linked into Zener diode DW2 and bears
Pole and commutation diode D1 positive pole, the positive pole of described Zener diode DW2 is linked into the negative pole of the zero line of civil power and the common port of ground wire and polarity filter capacitor E2, simultaneously Zener diode DW2 in parallel with polarity filter capacitor E2 after be linked in control chip, the positive pole of described polarity filter capacitor E2 is connected with the negative pole of described Zener diode DW2, its negative pole is linked into the positive pole of described Zener diode DW2 and the standby electricity source of control chip, and the common port of described commutation diode D1 negative pole and polarity filter capacitor E2 positive pole is linked into the power input of control chip.
In a preferred embodiment, described reduction voltage circuit is dropping resistor, and the input of described dropping resistor is linked into the live wire end of civil power, its outfan is linked into commutation diode D1 positive pole;Needed for described control chip, electric current is less than 2mA.
In a preferred embodiment, described dropping resistor includes the dropping resistor R1 that is connected in series and dropping resistor R4.
In a preferred embodiment, described reduction voltage circuit includes being connected on the dropping resistor R1 of civil power live wire end, blood pressure lowering electricity
The input of appearance C2, described dropping resistor R1 is linked into one end of the live wire end of civil power, its outfan and decompression capacitor C2 and connects
Connect；The other end of decompression capacitor C2 is linked into the negative pole of Zener diode.
In a preferred embodiment, described load is relay R L1.
In a preferred embodiment, described control chip is MCU.
The power supply of above-mentioned load supplying circuit is that the power supply that control chip provides is controlled, is provided by control chip
Low and high level controls the conducting of unidirectional controllable silicon S CR1, and controllable load power supply circuits do not work when standby, only at needs
In time, just works, it may be achieved reduce the requirement that stand-by power consumption is low, and circuit is simple, and the electronic devices and components that in circuit, the resistance of employing, electric capacity, diode etc. are conventional common are with low cost；Load supplying circuit is in the positive half cycle of civil power, and electric current, from dropping resistor, charges through decompression capacitor C1, decompression capacitor C1, and then through stabilivolt DW1 voltage stabilizing, polar capacitor E1 filters, and then flows back to zero line side through unidirectional controllable silicon S CR1.At the negative half period of civil power, electric current flows out from zero line side, and through diode D2, now unidirectional controllable silicon S CR1 reversely ends, and then through decompression capacitor C1, decompression capacitor C1 discharges, and is then passed through dropping resistor and returns to live wire end.When the both end voltage of polar capacitor E1 reaches the pick-up voltage of running voltage such as relay of load, load is started working.If arranged after satisfying condition (as arranged the time), the I/O end of control chip becomes low level (such as 0V), and unidirectional controllable silicon S CR1 ends, and civil power cannot give polar capacitor E1 charging, and the voltage at polar capacitor E1 two ends quickly lowers down, and load will not work.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the power supply circuits of one embodiment of the invention.
Detailed description of the invention
As it is shown in figure 1, the power supply circuits of one embodiment of the invention, including: control chip is connected with control chip
And supply electricity to the stand-by circuit of control chip and be connected and supply electricity to the load supplying circuit of load with control chip.
In the present embodiment, it is preferred that control chip is MCU (MicroControlUnit, micro-control unit).Load
Power supply circuits include: be connected with controllable electric power and to carry out the on-off circuit that turns on and load step-down circuit, load steady according to arranging
Volt circuit, load starting circuit.
As it is shown in figure 1, in the present embodiment, on-off circuit includes: the unidirectional controllable silicon S CR1 of high level one-way conduction.Negative
Load mu balanced circuit includes: be connected in parallel on the stabilivolt DW1 at load two ends.Load starting circuit includes: be connected in parallel on the polar capacitor E1 at load two ends.Load step-down circuit includes the load step-down resistance, decompression capacitor C1 and the diode D2 in parallel with polar capacitor E1 that are connected on civil power live wire.
Load step-down resistance input is linked into the live wire end of civil power, its outfan is linked into one end of decompression capacitor C1.
The negative pole of diode D2 is respectively connected in the other end of decompression capacitor C1 and the positive pole of polar capacitor E1, and the positive pole of diode D2 is respectively connected to the common port of the negative electrode of unidirectional controllable silicon S CR1 and the zero line side AC-L of civil power and earth terminal.
The pole that controls of unidirectional controllable silicon S CR1 is linked in the controllable electric power that control chip provides, unidirectional controllable silicon S CR1
Anode be linked into the negative pole of polar capacitor E1.
In the present embodiment, load step-down resistance is dropping resistor R1.Further, in the present embodiment, unidirectional controllable silicon S CR1
The pole that controls be linked into the I/O(input/output interface of control chip) interface end, and and the I/O(input/output interface of control chip) be additionally provided with resistance R3 between interface end.
After preventing power-off, artificially touch decompression capacitor C1 and get an electric shock, be connected in parallel at the two ends of decompression capacitor C1
There is discharge resistance R2.Discharge resistance R2, when disconnecting civil power, consumes the electric power storage bleeding off decompression capacitor C1 two ends, with anti-power failure
After, artificially touch decompression capacitor C1 and get an electric shock.
In the power supply circuits of the present embodiment, stand-by circuit includes: standby reduction voltage circuit, standby mu balanced circuit, standby rectification
Circuit and standby filter circuit.Control chip is supplied electricity to after the filtering of standby filter circuit.
Standby mu balanced circuit includes Zener diode DW2.Standby rectification circuit includes commutation diode D1.Filter circuit
Including polarity filter capacitor E2.
The input of standby reduction voltage circuit is linked into the live wire end of civil power, and the outfan of standby reduction voltage circuit is linked into voltage stabilizing
Diode DW2 negative pole and commutation diode D1 positive pole.
The positive pole of Zener diode DW2 is linked into the zero line of civil power and the common port of ground wire and polarity filter capacitor E2's
Negative pole.Simultaneously Zener diode DW2 in parallel with polarity filter capacitor E2 after be linked in control chip.
The positive pole of polarity filter capacitor E2 is connected with the negative pole of described Zener diode DW2, and polarity filter capacitor E2 bears
Pole is linked in the positive pole of Zener diode DW2 and the standby electricity source Vss of control chip.
The common port of commutation diode D1 negative pole and polarity filter capacitor E2 positive pole is linked into the power supply input of control chip
In end VDD.
When control chip simply need to be less than the electric current of 2mA, in the present embodiment, reduction voltage circuit is dropping resistor preferably.Drop
Volt circuit is preferred, adopts the economical and practical reduction voltage circuit of dropping resistor R1 and the dropping resistor R4 composition being connected in series.The input of dropping resistor R1 is linked into the live wire end AC-L of civil power, and the outfan of dropping resistor R4 is linked into commutation diode D1 positive pole.
When electric current needed for control chip is more than 2mA, reduction voltage circuit adopts the blood pressure lowering being connected on civil power live wire end AC-L
Resistance R1, decompression capacitor C2.The input of dropping resistor R1 is linked into the live wire end of civil power, dropping resistor R1 outfan with
One end of decompression capacitor C2 connects.The other end of decompression capacitor C2 is linked into the negative pole of Zener diode.
In the present embodiment, load is relay R L1 preferably, certainly also can be selected for other loads.
The power supply circuits of the present embodiment, after connecting civil power, the electric current of the positive half cycle of civil power is electric through blood pressure lowering from live wire end AC-L
Resistance R1, R4(or dropping resistor R1, decompression capacitor C2) blood pressure lowering, carry out voltage stabilizing then through Zener diode DW2, then rectified diode D1 rectification, after polarity filter capacitor E2 filtering, power to MCU, last electric current returns to zero line side AC-N.At the negative half period of civil power, electric current is from zero line side AC-N, through Zener diode DW2, then through dropping resistor R1(or decompression capacitor C2) return to live wire end AC-L.
Before unidirectional controllable silicon S CR1 is not turned on, civil power is without stabilivolt DW1, and the two ends of polar capacitor E1 do not have
Voltage, it is impossible to can not adhesive work for load and relay R L1.
When the I/O mouth of MCU becomes high level (such as 5V), by resistance R3, trigger unidirectional controllable silicon S CR1 one-way conduction, now, in the positive half cycle of civil power, electric current is from dropping resistor R1, charge through decompression capacitor C1, decompression capacitor C1, then through stabilivolt DW1 voltage stabilizing, polar capacitor E1 filters, and then flows back to zero line side AC-N through unidirectional controllable silicon S CR1.At the negative half period of civil power, electric current flows out from zero line side AC-N, now reversely ends through diode D2(unidirectional controllable silicon S CR1), then through decompression capacitor C1, decompression capacitor C1 discharges, and is then passed through dropping resistor R1 and returns to live wire end AC-L.When the both end voltage of polar capacitor E1 reaches the pick-up voltage of relay R L1, relay is started working.If arranged after satisfying condition (as arranged the time), the I/O end of MCU becomes low level (such as 0V), and unidirectional controllable silicon S CR1 ends, civil power cannot give polar capacitor E1 charging, the voltage at polar capacitor E1 two ends quickly lowers down, and relay R L1 will be switched off, and load will not work.
In the present embodiment, diode D2, when the civil power of input is negative half period, decompression capacitor C1 at input civil power is
Positive half cycle is charged to be discharged, in order to when the civil power of next positive half cycle arrives, decompression capacitor C1 can charge again.
The live wire end AC-L of civil power after the resistance-capacitance depressurization that dropping resistor R1, decompression capacitor C1 form, diode D2
After halfwave rectifier, through stabilivolt DW1, polar capacitor E1 voltage regulation filtering, flow to civil power zero line side AC-N then through unidirectional controllable silicon S CR1.Whether unidirectional controllable silicon S CR1 turns on, and can determine load such as relay R L1 work.When needs load such as relay R L1 works, control chip such as MCU triggers signal (i.e. the I/O end output high level of MCU) to unidirectional controllable silicon S CR1, and load supplying circuit is started working, and controls loaded work piece.When need not loaded work piece time, control chip remove to unidirectional controllable silicon S CR1 triggering signal after (i.e. the I/O end output low level of MCU), load supplying circuit quits work, control load current vanishes, load is not operated.
Namely general stand-by power consumption refers to only switch on power, power consumption when load is but without work, it is desirable to meet European Union EUP mark
Accurate (less than 0.5W).The power supply circuits of the present invention, when switching on power, only stand-by circuit is in work, because of unidirectional controlled
Silicon SCR1 is not turned on, and does not work, and does not consume power.If the operating current of control chip is 2mA or less than 2mA, the present embodiment adopt 2mA be calculated explanation, now owing to dropping resistor R1 is very big, the resistance of dropping resistor R4 arranges only small (can ignore during calculating) relative to dropping resistor R1, owing to the current requirements flow through is at about 2mA, standby power now is that the resistance R1 power 220V × 2mA=0.44W consumed adds the power 5V*2mA=0.01W consumed on DW1, altogether less than 0.5W.
If electric current is more than 2mA needed for control chip, dropping resistor R1, decompression capacitor C2 is adopted to form standby blood pressure lowering electricity
Road.As needed for control chip, electric current adopts 5mA electric current to illustrate, as very big in adopted dropping resistor R1, dropping resistor R4 carries out blood pressure lowering, then only consume the power of 220V × 5mA=1.1W on dropping resistor R1, exceeded 0.5W.Therefore electric current is more than 2mA needed for control chip, dropping resistor R1, decompression capacitor C2 is adopted to form standby reduction voltage circuit.Decompression capacitor C2 does not consume the power (micro power consumption of electric capacity actually its consumption, generally disregard), under communicational aspects, owing to decompression capacitor C2 has impedance to exist, it is possible to realize blood pressure lowering, the value of decompression capacitor C2 takes suitable capacitance (such as 0.33uF), at this moment dropping resistor R1 can obtain only small, as taken 100 Europe, power consumption at this moment is mainly resistance R1 and consumes, and electric capacity C1 does not substantially consume power consumption.At this moment actual power loss can calculate, and the power that dropping resistor R1 consumes is 5mA × 5mA × 100 Ω=0.25W, then adds the less 0.01W of the power consumption on Zener diode DW2, and general power is less than 0.5W, thus realizing the requirement that stand-by power consumption is low.
Namely low and high level is exported by control chip such as MCU owing to the power supply of load supplying circuit is that power supply is controlled
Controlling the conducting of unidirectional controllable silicon S CR1, controllable load power supply circuits do not work when standby, only when needed just work
Make, so achieve that the requirement that stand-by power consumption is low.If the power supply of load supplying circuit is uncontrollable, after connecting electricity, negative
Load power supply circuits are also in work, and the power supply of load supplying circuit is for driving load, and required electric current is relatively big, such as 40m
A, at this moment by calculating, total standby power is more than 0.5W.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, it is also possible to making some deformation and improvement, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (10)
1. power supply circuits, it is characterised in that including: control chip is connected with described control chip and supplies electricity to control chip
Stand-by circuit and the load supplying circuit that is connected with described control chip, described load supplying circuit includes: with described control
The I/O end of chip connects and according to arranging the on-off circuit and load step-down circuit, load mu balanced circuit, the load that carry out turning on
Start-up circuit；Described on-off circuit includes the unidirectional controllable silicon S CR1 of high level one-way conduction, and described load mu balanced circuit includes
Being connected in parallel on the stabilivolt DW1 at load two ends, described load starting circuit includes the polar capacitor E1 being connected in parallel on load two ends, institute
State load step-down resistance that load step-down circuit includes being connected on civil power live wire, decompression capacitor C1 and with polar capacitor E1 also
The diode D2 of connection, described load step-down resistance input is linked into the live wire end of civil power, its outfan is linked into decompression capacitor
One end of C1；Described diode D2 negative pole accesses in the other end of decompression capacitor C1 and the positive pole of polar capacitor E1, and the positive pole of diode D2 is linked into the common port of the negative electrode of unidirectional controllable silicon S CR1 and the zero line side of civil power and earth terminal；The pole that controls of unidirectional controllable silicon S CR1 is linked into the I/O end of control chip, and the anode of unidirectional controllable silicon S CR1 is linked into the negative pole of polar capacitor E1.
2. power supply circuits according to claim 1, it is characterised in that: described load step-down resistance includes dropping resistor R1.
3. power supply circuits according to claim 1, it is characterised in that: the control pole of described unidirectional controllable silicon S CR1 and control
Resistance R3 it is additionally provided with between coremaking sheet.
4. power supply circuits according to claim 1, it is characterised in that: described load supplying circuit also includes and blood pressure lowering electricity
Hold the discharge resistance R2 that C1 two ends are in parallel.
5. the power supply circuits according to Claims 1-4 any one, it is characterised in that: described stand-by circuit includes: treat
Machine reduction voltage circuit, standby mu balanced circuit, standby rectification circuit and standby filter circuit；Supply after the filtering of described standby filter circuit
nullSupply electricity to control chip，Described standby mu balanced circuit includes Zener diode DW2，Described standby rectification circuit includes commutation diode D1，Described filter circuit includes polarity filter capacitor E2，The input of described standby reduction voltage circuit is linked into the live wire end of civil power、Its outfan is linked into Zener diode DW2 negative pole and commutation diode D1 positive pole，The positive pole of described Zener diode DW2 is linked into the zero line of civil power and the common port of ground wire、And the negative pole of polarity filter capacitor E2，Simultaneously Zener diode DW2 in parallel with polarity filter capacitor E2 after be linked in control chip，The positive pole of described polarity filter capacitor E2 is connected with the negative pole of described Zener diode DW2、Its negative pole is linked into the positive pole of described Zener diode DW2 and the standby electricity source of control chip，The common port of described commutation diode D1 negative pole and polarity filter capacitor E2 positive pole is linked into the power input of control chip.
6. power supply circuits according to claim 5, it is characterised in that: described reduction voltage circuit is dropping resistor, and the input of described dropping resistor is linked into the live wire end of civil power, its outfan is linked into commutation diode D1 positive pole.
7. power supply circuits according to claim 6, it is characterised in that: needed for described control chip, electric current is less than 2mA;Described dropping resistor includes dropping resistor R1 and the dropping resistor R4 being connected in series.
8. power supply circuits according to claim 5, it is characterized in that: described reduction voltage circuit includes being connected on the dropping resistor R1 of civil power live wire end, decompression capacitor C2, the input of described dropping resistor R1 is linked into the live wire end of civil power, its outfan is connected with one end of decompression capacitor C2；The other end of decompression capacitor C2 is linked into the negative pole of Zener diode.
9. the power supply circuits according to Claims 1-4 any one, it is characterised in that: described control chip is MCU.
10. the power supply circuits according to Claims 1-4 any one, it is characterised in that: described load is relay R L1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410732834.1A CN105739583A (en) | 2014-12-07 | 2014-12-07 | Power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410732834.1A CN105739583A (en) | 2014-12-07 | 2014-12-07 | Power supply circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105739583A true CN105739583A (en) | 2016-07-06 |
Family
ID=56237274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410732834.1A Pending CN105739583A (en) | 2014-12-07 | 2014-12-07 | Power supply circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105739583A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271936A (en) * | 2020-10-26 | 2021-01-26 | 珠海格力电器股份有限公司 | Power supply circuit and electronic device |
| CN114640259A (en) * | 2022-03-22 | 2022-06-17 | 浙江诚富电器科技有限公司 | Power supply circuit and power supply mode of leakage protector with power factor less than 0.1PF |
-
2014
- 2014-12-07 CN CN201410732834.1A patent/CN105739583A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112271936A (en) * | 2020-10-26 | 2021-01-26 | 珠海格力电器股份有限公司 | Power supply circuit and electronic device |
| CN114640259A (en) * | 2022-03-22 | 2022-06-17 | 浙江诚富电器科技有限公司 | Power supply circuit and power supply mode of leakage protector with power factor less than 0.1PF |
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Application publication date: 20160706 |