CN107947561B - Power switch circuit for controlling strong current by weak current - Google Patents
Power switch circuit for controlling strong current by weak current Download PDFInfo
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- CN107947561B CN107947561B CN201810019860.8A CN201810019860A CN107947561B CN 107947561 B CN107947561 B CN 107947561B CN 201810019860 A CN201810019860 A CN 201810019860A CN 107947561 B CN107947561 B CN 107947561B
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- 238000001914 filtration Methods 0.000 claims abstract description 30
- 238000006243 chemical reaction Methods 0.000 claims abstract description 12
- 239000003990 capacitor Substances 0.000 claims description 56
- 238000004146 energy storage Methods 0.000 claims description 20
- 238000000034 method Methods 0.000 claims description 6
- 230000000087 stabilizing effect Effects 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 108091008695 photoreceptors Proteins 0.000 claims 3
- 230000003287 optical effect Effects 0.000 abstract description 4
- 230000003647 oxidation Effects 0.000 abstract description 4
- 238000007254 oxidation reaction Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000001939 inductive effect Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- 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
- H02M1/00—Details of apparatus for conversion
- H02M1/36—Means for starting or stopping converters
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- 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
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/33507—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
- H02M3/33523—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/78—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used using opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Dc-Dc Converters (AREA)
Abstract
The invention relates to a power switch circuit for controlling strong current by weak current, which comprises a standby power control circuit, a second light receiver of an optocoupler feedback circuit, an electronic switch S1, a standby power transformer, a standby power rectifying and filtering output circuit and an alternating current-direct current conversion circuit connected with alternating current commercial power; the standby power supply control circuit comprises a control chip IC1, and the control chip IC1 is connected with the AC/DC conversion circuit; the optical coupler feedback circuit comprises an optical coupler, and the optical coupler comprises a first light emitter and a second light receiver IC4 which are matched; when the electronic switch S1 is closed, the second light receiver IC4 is shorted, and the second light receiver IC4 cannot feed back the input current to the COMP pin of the control chip IC 1; when the electronic switch S1 is turned off, a standby voltage of +5v is output. Therefore, the electronic switch S1 is used for controlling the output of the standby power supply, so that the phenomena of large instantaneous current, ignition, oxidation, poor contact and the like are avoided, the service life of the computer power supply is prolonged, and the cost is reduced.
Description
Technical Field
The invention relates to the field of case power supply, in particular to a power switch circuit for controlling strong current by weak current.
Background
At present, computers in the market are mainly ATX power supplies, the ATX power supply has the functions of converting alternating current 220V power supply into direct current +5V, -5V, +12V, -12V, +3.3V and +5VSB power supplies required by the interior of the computer, and the combination of +5VSB and PS-ON is adopted to realize the main characteristics of the ATX power supply that the power supply is turned ON and off, so long as the power supply can be controlled to be turned ON and off by controlling the change of the PS-ON signal level; the existing control method is that a mechanical switch is arranged at the output end of alternating current commercial power to directly switch on and off a computer power supply, and then the on and off of +5VSB power supply is realized, however, the mechanical switch adopts a mechanical touch mode to change the on-off of a circuit, and because the mechanical switch needs 3C authentication, the cost is high, and the mechanical switch directly generates large instant current when a strong electric circuit is switched on, the contacts of a switch elastic sheet are easy to strike fire, the contacts are easy to oxidize to cause poor contact of the switch, the switching function is possibly invalid, and meanwhile, errors, abrasion and service life times are caused by touch, so that the service life of the computer power supply is influenced.
Accordingly, in the present patent application, the applicant has studied a power switching circuit for controlling strong current with weak current to solve the above-mentioned problems.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and mainly aims to provide a power supply switch circuit for controlling strong current by weak current, which controls the output of a standby power supply through an electronic switch S1, does not generate phenomena such as large instant current, ignition, oxidation, poor contact and the like, prolongs the service life of a computer power supply and reduces the cost. In order to achieve the above purpose, the present invention adopts the following technical scheme:
a power switch circuit for controlling strong current by weak current is used for controlling standby power output in an ATX power circuit of a computer and comprises a standby power control circuit, an optical coupler feedback circuit second light receiver, an electronic switch S1, a standby power transformer, a standby power rectifying and filtering output circuit and an AC/DC conversion circuit connected with AC mains supply;
The standby power supply control circuit comprises a control chip IC1, and the control chip IC1 is connected with an alternating current-direct current conversion circuit; the optocoupler feedback circuit comprises an optocoupler, the optocoupler comprises a first illuminator and a second light receiver IC4 which are matched, a COMP pin of a control chip IC1 is connected with a first pin 4 of the second light receiver IC4 of the second light receiver, a first pin 3 of the second light receiver IC4 is grounded, one end of an electronic switch S1 is connected with the COMP pin of the control chip IC1 through a resistor R16, the other end of the electronic switch S1 is grounded, the control chip IC1 is connected with a primary side of a standby power transformer, and a secondary side of the standby power transformer is connected with a standby power rectifying and filtering output circuit; the first light emitter is connected to the secondary side of the standby power transformer;
When the electronic switch S1 is closed, the second light receiver IC4 is shorted, and after the secondary side of the standby power transformer 20 is matched with the first light emitter and the second light receiver IC4, the second light receiver IC4 cannot feed back the input current to the COMP pin of the control chip IC 1;
When the electronic switch S1 is disconnected, after the secondary side of the standby power transformer 20 is matched with the first light emitter and the second light receiver IC4, the second light receiver IC4 feeds back input current to the COMP pin of the control chip IC 1; the control chip IC1 outputs voltage to the primary side of the standby power transformer, and the standby power rectifying and filtering output circuit controls and outputs +5V standby voltage through the voltage output by the secondary side of the standby power transformer.
As a preferred solution, the standby power control circuit further includes a resistor R22, a resistor R14, a resistor R34, a capacitor C2, a resistor R39, a resistor R24, a resistor R21, a resistor R25, a resistor R27, a resistor R11, a resistor R17, a resistor R20, a resistor R1, a first switching tube, a second switching tube, a capacitor C5, a polarity capacitor C11, a polarity capacitor C6, a capacitor C26, a zener diode D6, a zener diode ZD1, a diode D38, a diode D39, a diode D1, a diode D5, a diode D7, a diode D4, and a second light receiver IC3A; the control chip IC1 is provided with a control pin 1 to a control pin 8, the control pin 1 is grounded through a resistor R22, the COMP pin is a control pin 2, and the control pin 2 is grounded through a capacitor C4; the control pin 3 is a CS pin, the control pin 3 is simultaneously connected with one end of the capacitor C2 and one end of the resistor R14, and the other end of the capacitor C2 is grounded; the control pin 4 is grounded; the control pin 5 is a G pin, the control pin 5 is connected with one end of a resistor R39, the other end of the resistor R39 is simultaneously connected with one end of a resistor R34 and the control end of a switching tube, the other end of the resistor R34 is simultaneously connected with the other end of a resistor R14 and one end of a resistor R1, the other end of the resistor R1 is grounded, the output end of the switching tube is connected with one end of the resistor R1, the input end of the switching tube is connected with the positive electrode of a diode D7, the negative electrode of the diode D7 is connected with the negative electrode of a voltage-stabilizing diode D6, and the positive electrode of the voltage-stabilizing diode D6 is connected with a direct-current voltage source VDC;
The control pin 6 is a VCC pin, the control pin 6 is connected to the cathode of the diode D2, the anode of the diode D2 is connected to one end of the resistor R20 through the resistor R24, the other end of the resistor R20 is connected to the anode of the diode D5, the cathode of the diode D5 is grounded through the resistor R17, the anode of the polar capacitor C6 is connected to the cathode of the diode D5, the cathode of the polar capacitor C6 is grounded, the cathode of the diode D5 is simultaneously connected to one end of the resistor R11 and the output end of the switching tube Q1, the other end of the resistor R11 is connected to the second pin 4 of the second light receiver IC3A, the control end of the switching tube Q1 is connected to the cathode of the voltage stabilizing diode ZD1, the anode of the voltage stabilizing diode ZD1 is grounded, the input end of the switching tube Q1 is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the voltage source VCC; the control pin 8 is an HV pin, the control pin 8 is connected with a resistor R25 through a resistor R21, the resistor R25 is connected with one end of a resistor R27, the other end of the resistor R27 is simultaneously connected with the cathode of a diode D39 and the cathode of a diode D38, the anode of the diode D39 is connected with a live wire L of alternating current mains supply, and the anode of a pole tube D38 is connected with a zero line N of the alternating current mains supply.
As a preferred solution, the control pin 7 is a spare pin.
As a preferable scheme, the standby power transformer has a standby power pin 2, a standby power pin 4, a standby power pin 5 and a standby power pin 6, the standby power pin 2 is connected with the anode of the zener diode D6, the standby power pin 4 is connected with the anode of the diode D7, the standby power pin 5 is connected with one end of the resistor R20, and the standby power pin 6 is grounded.
As a preferable scheme, the standby power supply rectifying and filtering output circuit comprises a first rectifying module and a first capacitance and inductance filtering module, wherein the standby power supply transformer is connected with the first rectifying module, the first rectifying module is connected with the first capacitance and inductance filtering module, the first rectifying module receives and outputs an output signal of the standby power supply transformer after processing, and the first capacitance and inductance filtering module receives and outputs +5V standby voltage after processing an output signal of the first rectifying module.
As a preferable scheme, the first capacitive inductance filter module is connected with a first voltage controller, and the first voltage controller is connected with a standby power supply control circuit.
As a preferred solution, the ac/DC conversion circuit includes a bridge rectifier module, a PFC inductor, a PFC-PWN controller, a high voltage diode filter module, a high voltage power filter module, a main power transformer, a second capacitor inductor filter module, a second rectifier module, an energy storage inductor, a first DC-DC converter, a second DC-DC converter, a third capacitor inductor filter module, a second voltage controller, a protection IC module, a VCC power module, and an EMI circuit connected to an ac mains supply; the output end of the EMI circuit is connected with a bridge rectifier module, the bridge rectifier module is connected with a PFC inductor, the PFC inductor is connected with a high-voltage diode filter module, the high-voltage diode filter module is connected with a high-voltage capacitor filter module, the high-voltage capacitor filter module is connected with a main power transformer, the main power transformer is connected with a second rectifier module, the second rectifier module is connected with an energy storage inductor, the energy storage inductor is simultaneously connected with a second capacitor inductor filter module, a first DC-DC converter, a second DC-DC converter and a third capacitor inductor filter module, the second capacitor inductor filter module receives the output signal of the energy storage inductor and outputs +12V voltage after being processed, the first DC-DC converter receives the output signal of the energy storage inductor and outputs +3V voltage after being processed, the third capacitor inductor filter module receives the output signal of the energy storage inductor and outputs-12V voltage after being processed, the second capacitor filter module, the first DC-DC converter, the second capacitor filter inductor, the second DC-DC converter, the second capacitor-DC converter and the third capacitor filter module are connected with a power supply control circuit, the voltage of the PWN-DC converter is connected with a power supply control module, the PWN-DC converter is connected with a power supply control circuit, the PWN control module is connected with the PWN control module, the PFC-PWN controller is respectively connected with the high-voltage diode filter module and the main power transformer.
As a preferable scheme, the power switch circuit is disposed in a case of the computer, and a manual control switch is exposed on the surface of the case, and the manual control switch is linked with the on/off of the electronic switch S1.
As a preferable mode, the manual control switch is a swing control type button.
Compared with the prior art, the invention has obvious advantages and beneficial effects, in particular: the output of the standby power supply is controlled by opening and closing an electronic switch S1 in a standby power supply control circuit, the circuit of the chassis power supply is not required to be greatly improved, the circuit structure design is ingenious and reasonable, the output of the standby voltage (also referred to as +5SB) of +5V in the whole switch circuit is controlled by controlling whether the second light receiver IC4 can feed back the input current to a COMP pin of the control chip IC1, the output is equivalent to weak current control strong current, and the direct adoption of a mechanical switch in the strong current circuit is avoided, so that the phenomena of large instant current, ignition, oxidation, poor contact and the like are avoided, and the service life of the computer power supply is prolonged; in addition, the electronic switch S1 is adopted, 3C authentication is not needed, the cost is low, and better economic benefits are achieved; and, overall structure design is ingenious, and each circuit performance is stable and safe and reliable.
In order to more clearly illustrate the structural features and efficacy of the present invention, a detailed description thereof will be given below with reference to the accompanying drawings and examples.
Drawings
FIG. 1 is a schematic diagram of a general control architecture of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a standby power control circuit according to an embodiment of the invention;
FIG. 3 is an overall control block diagram of an embodiment of the present invention.
Reference numerals illustrate:
10. Standby power supply control circuit 20 and stand by power supply transformer
30. Standby power supply rectifying and filtering output circuit 40, ac/dc conversion circuit
50. AC mains supply.
Detailed Description
The invention is further described below with reference to the drawings and detailed description.
As shown in fig. 1 to 3, a power switch circuit for controlling strong current with weak current is used in a computer ATX power circuit to control standby power output, and includes a standby power control circuit, an optocoupler feedback circuit, a second light receiver, an electronic switch S1, a standby power transformer, a standby power rectifying and filtering output circuit, and an ac/dc conversion circuit connected to ac mains supply; the standby power supply control circuit comprises a control chip IC1, and the control chip IC1 is connected with an alternating current-direct current conversion circuit; the optocoupler feedback circuit comprises an optocoupler, the optocoupler comprises a first illuminator and a second light receiver IC4 which are matched, a COMP pin of a control chip IC1 is connected with a first pin 4 of the second light receiver IC4 of the second light receiver, a first pin 3 of the second light receiver IC4 is grounded, one end of an electronic switch S1 is connected with the COMP pin of the control chip IC1 through a resistor R16, the other end of the electronic switch S1 is grounded, the control chip IC1 is connected with a primary side of a standby power transformer, and a secondary side of the standby power transformer is connected with a standby power rectifying and filtering output circuit; the first light emitter is connected to the secondary side of the standby power transformer.
When the electronic switch S1 is closed, the second light receiver IC4 is shorted, and after the secondary side of the standby power transformer 20 is matched with the first light emitter and the second light receiver IC4, the second light receiver IC4 cannot feed back the input current to the COMP pin of the control chip IC 1;
When the electronic switch S1 is disconnected, after the secondary side of the standby power transformer 20 is matched with the first light emitter and the second light receiver IC4, the second light receiver IC4 feeds back input current to the COMP pin of the control chip IC 1; the control chip IC1 outputs voltage to the primary side of the standby power transformer, and the standby power rectifying and filtering output circuit controls and outputs +5V standby voltage through the voltage output by the secondary side of the standby power transformer.
In general, the power switch circuit is disposed in a casing of the computer, and a manual control switch is exposed on the surface of the casing, and the manual control switch is linked with the on/off of the electronic switch S1. The manual control switch is preferably designed as a rocking control button. Thus, the user operates the manual control switch outside the casing, and in practice, controls the casing power supply by controlling the strong current with the weak current in conjunction with the closing and opening of the electronic switch S1.
Of course, the above-mentioned control of the output of the standby power supply by opening and closing the electronic switch S1 in the standby power supply control circuit does not need to greatly improve the circuit of the chassis power supply, and the circuit structure design is ingenious and reasonable, and the output of the +5v standby voltage (also referred to as +5sb) in the whole switch circuit is controlled by controlling whether the second light receiver IC4 can feed back the input current to the COMP pin of the control chip IC 1.
In this embodiment, the standby power control circuit 10 further includes a resistor R22, a resistor R16, a resistor R14, a resistor R34, a capacitor C2, a resistor R39, a resistor R24, a resistor R21, a resistor R25, a resistor R27, a resistor R11, a resistor R17, a resistor R20, a resistor R1, a first switch tube, a second switch tube, a capacitor C5, a polarity capacitor C11, a polarity capacitor C6, a capacitor C26, a zener diode D6, a zener diode ZD1, a diode D38, a diode D39, a diode D1, a diode D5, a diode D7, a diode D4, and a second light receiver IC3A, where the control chip IC1 has a control pin 1 to a control pin 8, where the control pin 1 is grounded through the resistor R22, the control pin 2 is grounded through the capacitor C4, the control pin 3 is a CS pin, and the control pin 3 is simultaneously connected to one end of the capacitor C2 and the other end of the resistor R14 is grounded; the control pin 4 is grounded; the control pin 5 is a G pin, the control pin 5 is connected with one end of a resistor R39, the other end of the resistor R39 is simultaneously connected with one end of a resistor R34 and the control end of a switching tube, the other end of the resistor R34 is simultaneously connected with the other end of a resistor R14 and one end of a resistor R1, the other end of the resistor R1 is grounded, the output end of the switching tube is connected with one end of the resistor R1, the input end of the switching tube is connected with the positive electrode of a diode D7, the negative electrode of the diode D7 is connected with the negative electrode of a voltage-stabilizing diode D6, and the positive electrode of the voltage-stabilizing diode D6 is connected with a direct-current voltage source VDC;
The control pin 6 is connected with the cathode of the diode D2, the anode of the diode D2 is connected with one end of the resistor R20 through the resistor R24, the other end of the resistor R20 is connected with the anode of the diode D5, the cathode of the diode D5 is grounded through the resistor R17, the anode of the polar capacitor C6 is connected with the cathode of the diode D5, the cathode of the polar capacitor C6 is grounded, the cathode of the diode D5 is simultaneously connected with one end of the resistor R11 and the output end of the switch tube Q1, the other end of the resistor R11 is connected with the second pin 4 of the second light receiver IC3A, the second pin 3 of the second light receiver IC3A is grounded through the capacitor C26, the control end of the switch tube Q1 is connected with the cathode of the zener diode ZD1, the anode of the zener diode ZD1 is grounded, the input end of the switch tube Q1 is connected with the anode of the diode D1, and the cathode of the diode D1 is connected with the voltage source VCC; the control pin 7 is a standby pin; the control pin 8 is connected with a resistor R25 through a resistor R21, the resistor R25 is connected with one end of a resistor R27, the other end of the resistor R27 is simultaneously connected with the cathode of a diode D39 and the cathode of a diode D38, the anode of the diode D39 is connected with a live wire L of an alternating current mains supply 50, and the anode of a pole tube D38 is connected with a zero line N of the alternating current mains supply 50.
In this embodiment, the standby power transformer 20 has a standby power pin 2, a standby power pin 4, a standby power pin 5, and a standby power pin 6, where the standby power pin 2 is connected to the anode of the zener diode D6, the standby power pin 4 is connected to the anode of the diode D7, the standby power pin 5 is connected to one end of the resistor R20, and the standby power pin 6 is grounded.
The standby power supply rectifying and filtering output circuit 30 comprises a first rectifying module and a first capacitive and inductive filtering module, the standby power supply transformer 20 is connected with the first rectifying module, the first rectifying module is connected with the first capacitive and inductive filtering module, the first rectifying module receives and processes an output signal of the standby power supply transformer 20 and outputs +5v standby voltage, and the first capacitive and inductive filtering module receives and processes an output signal of the first rectifying module and outputs +5v standby voltage; the first capacitive inductance filter module is connected with a first voltage controller, and the first voltage controller is connected with the standby power supply control circuit 10.
The ac/DC conversion circuit 40 includes a bridge rectifier module, a PFC inductor, a PFC-PWN controller, a high voltage diode filter module, a high voltage capacitor filter module, a main power transformer, a second capacitor inductor filter module, a second rectifier module, an energy storage inductor, a first DC-DC converter, a second DC-DC converter, a third capacitor inductor filter module, a second voltage controller, a protection IC module, a VCC power module, and an EMI circuit connected to the ac mains 50, wherein an output end of the EMI circuit is connected to the bridge rectifier module, the bridge rectifier module is connected to the PFC inductor, the PFC inductor is connected to the high voltage diode filter module, the high voltage diode filter module is connected to the high voltage capacitor filter module, the high voltage capacitor filter module is connected to the main power transformer, and the main power transformer is connected to the second rectifier module, the second rectifying module is connected with the energy storage inductor, the energy storage inductor is simultaneously connected with the second capacitance inductor filtering module, the first DC-DC converter, the second DC-DC converter and the third capacitance inductor filtering module, the second capacitance inductor filtering module receives the voltage of +12V after the output signal of the energy storage inductor is processed, the first DC-DC converter receives the voltage of +5V after the output signal of the energy storage inductor is processed, the second DC-DC converter receives the voltage of +3V after the output signal of the energy storage inductor is processed, the third capacitance inductor filtering module receives the voltage of-12V after the output signal of the energy storage inductor is processed, the second capacitance inductor filtering module, the first DC-DC converter, the second DC-DC converter, the third capacitance inductor filtering module and the first capacitance inductor filtering module are all connected with the protection IC module, the protection IC module and the standby power control circuit 10 are both connected with a VCC power module, the protection IC module receives the output signal from the first capacitive-inductive filter module, processes the output signal, and outputs a PG signal and a PS-ON signal, the VCC power module is connected with a PFC-PWN controller, the second DC-DC converter is connected with the PFC-PWN controller through a second voltage controller, and the PFC-PWN controller is respectively connected with the high voltage diode filter module and the main power transformer.
The invention is characterized in that the invention mainly controls the output of the standby power supply by opening and closing an electronic switch S1 in a standby power supply control circuit, the circuit of the case power supply is not required to be greatly improved, the circuit structure design is ingenious and reasonable, the output of the standby voltage (also referred to as +5SB) of +5V in the whole switch circuit is controlled by controlling whether the second light receiver IC4 can feed back the input current to the COMP pin of the control chip IC1, which is equivalent to weak current control strong current, and the direct adoption of a mechanical switch in the strong current circuit is avoided, thereby avoiding the phenomena of large instant current, ignition, oxidation, poor contact and the like, and prolonging the service life of the computer power supply; in addition, the electronic switch S1 is adopted, 3C authentication is not needed, the cost is low, and better economic benefits are achieved; and, overall structure design is ingenious, and each circuit performance is stable and safe and reliable.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical principles of the present invention still fall within the scope of the technical solutions of the present invention.
Claims (7)
1. The utility model provides a power switch circuit of weak current control strong current which is arranged in computer ATX power supply circuit control standby power output, its characterized in that: the power supply comprises a standby power supply control circuit, an optocoupler feedback circuit, an electronic switch S1, a standby power supply transformer, a standby power supply rectifying and filtering output circuit and an alternating current-direct current conversion circuit connected to alternating current commercial power;
The standby power supply control circuit comprises a control chip IC1, and the control chip IC1 is connected with an alternating current-direct current conversion circuit; the optocoupler feedback circuit comprises an optocoupler, the optocoupler comprises a first illuminator and a second photoreceptor IC4 which are matched, a COMP pin of a control chip IC1 is connected with a first pin 4 of the second photoreceptor IC4, a first pin 3 of the second photoreceptor IC4 is grounded, one end of an electronic switch S1 is connected with the COMP pin of the control chip IC1 through a resistor R16, the other end of the electronic switch S1 is grounded, the control chip IC1 is connected with a primary side of a standby power transformer, and a secondary side of the standby power transformer is connected with a standby power rectifying and filtering output circuit; the first light emitter is connected to the secondary side of the standby power transformer;
When the electronic switch S1 is closed, the second light receiver IC4 is short-circuited, and after the secondary side of the standby power transformer is matched with the first light emitter and the second light receiver IC4, the second light receiver IC4 cannot feed back input current to the COMP pin of the control chip IC 1;
When the electronic switch S1 is disconnected, after the secondary side of the standby power transformer is matched with the first light emitter and the second light receiver IC4, the second light receiver IC4 feeds back input current to the COMP pin of the control chip IC 1; the control chip IC1 outputs voltage to the primary side of the standby power transformer, and the standby power rectifying and filtering output circuit controls and outputs +5V standby voltage through the voltage output by the secondary side of the standby power transformer;
The standby power supply rectifying and filtering output circuit comprises a first rectifying module and a first capacitance-inductance filtering module, the standby power supply transformer is connected with the first rectifying module, the first rectifying module is connected with the first capacitance-inductance filtering module, the first rectifying module receives and processes an output signal of the standby power supply transformer and outputs +5V standby voltage, and the first capacitance-inductance filtering module receives and processes an output signal of the first rectifying module and outputs +5V standby voltage;
the power switch circuit is arranged in a case of the computer, a manual control switch is exposed on the surface of the case, and the manual control switch is linked with the closing and opening of the electronic switch S1.
2. The weak current controlled strong current power switching circuit of claim 1, wherein: the standby power control circuit further comprises a resistor R22, a resistor R14, a resistor R34, a capacitor C2, a resistor R39, a resistor R24, a resistor R21, a resistor R25, a resistor R27, a resistor R11, a resistor R17, a resistor R20, a resistor R1, a switching tube Q29, a capacitor C5, a polarity capacitor C11, a polarity capacitor C6, a capacitor C126, a voltage stabilizing diode D6, a voltage stabilizing diode ZD1, a diode D38, a diode D39, a diode D1, a diode D5, a diode D7, a diode D4 and a second light receiver IC3A; the control chip IC1 is provided with a control pin 1 to a control pin 8, the control pin 1 is grounded through a resistor R22, the COMP pin is a control pin 2, and the control pin 2 is grounded through a capacitor C4; the control pin 3 is a CS pin, the control pin 3 is simultaneously connected with one end of the capacitor C2 and one end of the resistor R14, and the other end of the capacitor C2 is grounded; the control pin 4 is grounded; the control pin 5 is a G pin, the control pin 5 is connected with one end of a resistor R39, the other end of the resistor R39 is simultaneously connected with one end of a resistor R34 and the control end of a switching tube Q29, the other end of the resistor R34 is simultaneously connected with the other end of a resistor R14 and one end of a resistor R1, the other end of the resistor R1 is grounded, the output end of the switching tube Q29 is connected with one end of the resistor R1, the input end of the switching tube Q29 is connected with the positive electrode of a diode D7, the negative electrode of the diode D7 is connected with the negative electrode of a voltage-stabilizing diode D6, and the positive electrode of the voltage-stabilizing diode D6 is connected with a direct-current voltage source VDC;
The control pin 6 is a VCC pin, the control pin 6 is connected to the cathode of the diode D2, the anode of the diode D2 is connected to one end of the resistor R20 through the resistor R24, the other end of the resistor R20 is connected to the anode of the diode D5, the cathode of the diode D5 is grounded through the resistor R17, the anode of the polar capacitor C6 is connected to the cathode of the diode D5, the cathode of the polar capacitor C6 is grounded, the cathode of the diode D5 is simultaneously connected to one end of the resistor R11 and the output end of the switching tube Q1, the other end of the resistor R11 is connected to the second pin 4 of the second light receiver IC3A, the control end of the switching tube Q1 is connected to the cathode of the voltage stabilizing diode ZD1, the anode of the voltage stabilizing diode ZD1 is grounded, the input end of the switching tube Q1 is connected to the anode of the diode D1, and the cathode of the diode D1 is connected to the voltage source VCC; the control pin 8 is an HV pin, the control pin 8 is connected with a resistor R25 through a resistor R21, the resistor R25 is connected with one end of a resistor R27, the other end of the resistor R27 is simultaneously connected with the negative electrode of a diode D39 and the negative electrode of a diode D38, the positive electrode of the diode D39 is connected with a live wire L of alternating current mains supply, the control pin 6 is grounded through a capacitor C5, the positive electrode of a polar capacitor C11 is connected with the control pin 6, the negative electrode of the polar capacitor C11 is grounded, one end of the resistor R39 is connected with the negative electrode of a diode D4, the other end of the resistor R39 is connected with the positive electrode of the diode D4, and the positive electrode of the diode D38 is connected with a zero line N of the alternating current mains supply.
3. The weak current controlled strong current power switching circuit according to claim 2, wherein: the control pin 7 is a spare pin.
4. The weak current controlled strong current power switching circuit according to claim 2, wherein: the standby power transformer is provided with a standby power pin 2, a standby power pin 4, a standby power pin 5 and a standby power pin 6, wherein the standby power pin 2 is connected with the anode of the zener diode D6, the standby power pin 4 is connected with the anode of the diode D7, the standby power pin 5 is connected with one end of the resistor R20, and the standby power pin 6 is grounded.
5. The weak current controlled strong current power switching circuit of claim 1, wherein: the first capacitive inductance filter module is connected with a first voltage controller, and the first voltage controller is connected with a standby power supply control circuit.
6. The weak current controlled strong current power switching circuit of claim 4, wherein: the alternating current-direct current conversion circuit comprises a bridge rectifier module, a PFC inductor, a PFC-PWM controller, a high-voltage diode filter module, a high-voltage power filter module, a main power transformer, a second capacitor inductor filter module, a second rectifier module, an energy storage inductor, a first DC-DC converter, a second DC-DC converter, a third capacitor inductor filter module, a second voltage controller, a protection IC module, a VCC power module and an EMI circuit connected to alternating current mains supply; the output end of the EMI circuit is connected with a bridge rectifier module, the bridge rectifier module is connected with a PFC inductor, the PFC inductor is connected with a high-voltage diode filter module, the high-voltage diode filter module is connected with a high-voltage capacitor filter module, the high-voltage capacitor filter module is connected with a main power transformer, the main power transformer is connected with a second rectifier module, the second rectifier module is connected with an energy storage inductor, the energy storage inductor is simultaneously connected with a second capacitor inductor filter module, a first DC-DC converter, a second DC-DC converter and a third capacitor inductor filter module, the second capacitor inductor filter module receives the output signal of the energy storage inductor and outputs +12V voltage after processing, the first DC-DC converter receives the output signal of the energy storage inductor and outputs +5V voltage, the second DC-DC converter receives the output signal of the energy storage inductor and outputs +3.3V voltage, the third capacitance inductance filter module receives the output signal of the energy storage inductor and outputs-12V voltage, the second capacitance inductance filter module, the first DC-DC converter, the second DC-DC converter, the third capacitance inductance filter module and the first capacitance inductance filter module are all connected with the protection IC module, the protection IC module and the standby power supply control circuit are all connected with the VCC power supply module, the protection IC module receives the PG signal and the PS-ON signal which are output after the output signal from the first capacitance inductance filter module is processed, the VCC power supply module is connected with the PFC-PWM controller, the second DC-DC converter is connected with the PFC-PWM controller through the second voltage controller, the PFC-PWM controller is respectively connected with the high-voltage diode filter module and the main power transformer.
7. The weak current controlled strong current power switching circuit of claim 1, wherein: the manual control switch is a swing control type button.
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| JP3042217B2 (en) * | 1992-09-22 | 2000-05-15 | 株式会社村田製作所 | Switching power supply |
| JPH09121537A (en) * | 1995-10-26 | 1997-05-06 | Hitachi Ltd | Short-circuit protective circuit for power source |
| JP4242205B2 (en) * | 2003-05-21 | 2009-03-25 | ニチコン株式会社 | Switching power supply |
| JP2008541688A (en) * | 2005-05-10 | 2008-11-20 | エヌエックスピー ビー ヴィ | Feedback information transmission technology for switch-mode power supplies |
| JP4013162B2 (en) * | 2005-06-14 | 2007-11-28 | 船井電機株式会社 | Switching power supply |
| JP2007174791A (en) * | 2005-12-21 | 2007-07-05 | Sharp Corp | Switching power supply |
| JP2008010972A (en) * | 2006-06-27 | 2008-01-17 | Funai Electric Co Ltd | Power supply control apparatus, and television receiver |
| JP5905689B2 (en) * | 2011-09-13 | 2016-04-20 | ローム株式会社 | DC / DC converter, power supply device using the same, and electronic device |
| CN202261029U (en) * | 2011-09-19 | 2012-05-30 | 深圳市共进电子股份有限公司 | Switch power supply circuit with overvoltage protection |
| CN202997956U (en) * | 2012-11-14 | 2013-06-12 | 西安众智惠泽光电科技有限公司 | Explosion-proof DC voltage-stabilizing power supply for coal mine |
| CN105244981B (en) * | 2015-11-20 | 2017-12-26 | 深圳市祝你快乐科技有限公司 | A kind of energy-saving charger that can be automatically powered off |
| CN105449991B (en) * | 2015-12-21 | 2018-06-08 | 广东美的厨房电器制造有限公司 | Low-power dissipation standby device and electrical equipment |
| CN205595766U (en) * | 2016-03-09 | 2016-09-21 | 深圳市共进电子股份有限公司 | Protection circuit and flyback switching power supply |
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