CN204392106U - Switching power supply - Google Patents
Switching power supply Download PDFInfo
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- CN204392106U CN204392106U CN201520092402.9U CN201520092402U CN204392106U CN 204392106 U CN204392106 U CN 204392106U CN 201520092402 U CN201520092402 U CN 201520092402U CN 204392106 U CN204392106 U CN 204392106U
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Abstract
The utility model relates to a kind of Switching Power Supply, the ac signal of the first ac input end and the input of the second ac input end is through the first ac input end, second ac input end, rectification circuit, filter circuit, PWM control integration circuit, the effect of the reduction voltage circuit of metal-oxide-semiconductor and transformer composition etc., and by the first common mode inductance, second common mode inductance, the effect of the 3rd common mode inductance and varistor, output stability and fail safe preferably voltage and current, the surge effectively avoiding alternating current to bring is to the damage of electronic product being connected to the first DC output end and the second DC output end.Metal-oxide-semiconductor is formed by the 3rd resistance and opens path, and form shutoff path by the 5th resistance and the first diode, by adjusting the size of the 3rd resistance and the 5th resistance, the transit time that metal-oxide-semiconductor turns on and off can be controlled arbitrarily, to shorten the transit time turned on and off of metal-oxide-semiconductor, decrease the caloric value of metal-oxide-semiconductor, extend the useful life of Switching Power Supply.
Description
Technical field
The utility model relates to field of power supplies, particularly relates to a kind of Switching Power Supply.
Background technology
Switching Power Supply utilizes modern power electronics technology, the time ratio that control switch pipe turns on and off, and maintain a kind of power supply of regulated output voltage, Switching Power Supply is generally made up of pulse width modulation (PWM) control IC and MOSFET.Along with development and the innovation of power electronic technology, switch power technology is also constantly being innovated.At present, Switching Power Supply to be widely used nearly all electronic equipment with small-sized, light weight and high efficiency feature, is the indispensable a kind of power mode of current electronics and information industry develop rapidly.
But existing Switching Power Supply stability is not good, the voltage and current surge that alternating current brings forms very large threat to electronic product, and in addition, existing Switching Power Supply caloric value is large, causes the temperature of product to raise, thus affects the life-span of product.
Utility model content
Based on this, be necessary for Switching Power Supply problem of the prior art, provide a kind of stability better and the Switching Power Supply that caloric value is low.
A kind of Switching Power Supply, comprise: the first ac input end, second ac input end, first common mode inductance, second common mode inductance, varistor, first electric capacity, first resistance, rectifying full bridge, second electric capacity, PWM control integration circuit, second resistance, metal-oxide-semiconductor, 3rd resistance, 4th resistance, 5th resistance, first diode, 6th resistance, 7th resistance, 3rd electric capacity, 8th resistance, 9th resistance, first thermistor, second diode, 4th electric capacity, transformer, tenth resistance, 3rd diode, 11 resistance, 5th electric capacity, 6th electric capacity, 7th electric capacity, 12 resistance, inductance, Schottky diode, 8th electric capacity, 13 resistance, 3rd common mode inductance, 14 resistance, 9th electric capacity, tenth electric capacity, optocoupler, 11 electric capacity, 15 resistance, 16 resistance, controllable accurate source of stable pressure, 17 resistance and the 18 resistance,
PWM control integration circuit has GATE end, VIN end, vdd terminal, RT end, SENSE end, FB end, RI end and GND end;
First ac input end and the second ac input end are connected with the first end of the first coil in the first common mode inductance and the first end of the second coil respectively, and varistor is connected with the first end of the first coil in the first common mode inductance and the first end of the second coil respectively;
First electric capacity is connected with the first resistor coupled in parallel, and is connected with the second end of the first coil in the first common mode inductance and the second end of the second coil respectively;
In second common mode inductance, the first end of the first coil and the first end of the second coil are connected with the first end of the first coil in the first common mode inductance and the first end of the second coil respectively, in second common mode inductance, two ac input ends of the second end of the second end of the first coil and the second coil rectifying full bridge respectively connect, and the second electric capacity is connected with the direct current positive output end of rectifying full bridge and direct current negative output terminal respectively;
VIN end is connected with the direct current positive output end of rectifying full bridge by the second resistance, the grid of metal-oxide-semiconductor is held with GATE by the 3rd resistance and is connected, the grid of metal-oxide-semiconductor is also by the 4th grounding through resistance, the grid of metal-oxide-semiconductor is also held with GATE be connected by the 5th resistance, the first diode successively, the source electrode of metal-oxide-semiconductor is held with SENSE by the 6th resistance and is connected, the source electrode of metal-oxide-semiconductor is also by the 7th grounding through resistance, and SENSE end is by the 3rd capacity earth;
RI end is by the 8th grounding through resistance, RT end is successively by the 9th resistance, the first thermistor ground connection, GND holds ground connection, the drain electrode of metal-oxide-semiconductor is connected with the positive pole of the second diode, 4th electric capacity and the 9th resistor coupled in parallel, and be connected with the negative pole of the second diode and the direct current positive output end of rectifying full bridge respectively;
The secondary coil that transformer comprises primary coil, be coupled with primary coil, the ancillary coil be coupled with secondary coil;
The different name end of primary coil is connected with the direct current positive output end of rectifying full bridge, the Same Name of Ends of primary coil is connected with the drain electrode of metal-oxide-semiconductor, the Same Name of Ends of ancillary coil is connected with the positive pole of the 3rd diode by the tenth resistance, the negative pole of the 3rd diode is connected with vdd terminal, the Same Name of Ends of ancillary coil is also successively by the 11 resistance, the 5th capacity earth, the different name end ground connection of ancillary coil, vdd terminal is by the 6th capacity earth;
The Same Name of Ends of secondary coil is connected with the first end of inductance by the 7th electric capacity, the 12 resistance successively, the Same Name of Ends of secondary coil is also connected with the first end of inductance by Schottky diode, 8th electric capacity and the 13 resistor coupled in parallel, and be connected with the different name end of secondary coil and the negative pole of Schottky diode respectively;
In 3rd common mode inductance, the first end of the first coil is connected with the second end of inductance, in 3rd common mode inductance, the first end of the second coil is connected with the different name end of secondary coil, between the first end of the 14 resistance and the 9th Capacitance parallel connection first coil in the 3rd common mode inductance and the first end of the second coil, first output and the second output are connected with the second end of the first coil in the 3rd common mode inductance and the second end of the second coil respectively, and the tenth electric capacity is connected with the first output and the second output respectively;
FB end is connected with the collector electrode of phototriode in optocoupler, the grounded emitter of phototriode in optocoupler, 11 electric capacity is connected between the collector and emitter of phototriode in optocoupler, second end of inductance is successively by the 15 resistance, 16 resistance is connected with the negative pole end of controllable accurate source of stable pressure, in optocoupler, the positive pole of light-emitting diode is connected between the 15 resistance and the 16 resistance, in optocoupler, the negative pole of light-emitting diode is connected with the negative pole end of controllable accurate source of stable pressure, the negative pole end of controllable accurate source of stable pressure is connected with the reference edge of controllable accurate source of stable pressure by the 11 electric capacity, the reference edge of controllable accurate source of stable pressure is connected with the positive terminal of controllable accurate source of stable pressure by the 17 resistance, the reference edge of controllable accurate source of stable pressure is connected with the second end of inductance by the 18 resistance.
Wherein in an embodiment, also comprise resistance wire and the second thermistor, first ac input end is connected with the first end of the first coil in the first common mode inductance by resistance wire, and the second ac input end is connected with the first end of the second coil in the first common mode inductance by the second thermistor.
Wherein in an embodiment, the second electric capacity comprises polar capacitor and polarity free capacitor, polar capacitor and polarity free capacitor parallel connection.
Wherein in an embodiment, the 6th electric capacity comprises polar capacitor and polarity free capacitor, polar capacitor and polarity free capacitor parallel connection.
Wherein in an embodiment, also comprise light-emitting diode and the 19 resistance, the 19 resistance respectively the second end of inductance and the positive pole of light-emitting diode connects, and the negative pole of light-emitting diode is connected with the positive pole of controllable accurate source of stable pressure.
Above-mentioned Switching Power Supply is by the effect of the first common mode inductance, the second common mode inductance, the 3rd common mode inductance and varistor, output stability and fail safe preferably voltage and current, the surge effectively avoiding alternating current to bring is to the damage of electronic product being connected to the first DC output end and the second DC output end.In addition, metal-oxide-semiconductor is formed by the 3rd resistance and opens path, and form shutoff path by the 5th resistance and the first diode, by adjusting the size of the 3rd resistance and the 5th resistance, the transit time that metal-oxide-semiconductor turns on and off can be controlled arbitrarily, to shorten the transit time turned on and off of metal-oxide-semiconductor, decrease the caloric value of metal-oxide-semiconductor, extend the useful life of Switching Power Supply.
Accompanying drawing explanation
Fig. 1 is the electrical block diagram of the utility model one preferred embodiment Switching Power Supply;
The pwm signal change curve that the electric current that Fig. 2 is the drain electrode and source electrode of flowing through metal-oxide-semiconductor shown in Fig. 1 receives with pwm signal input.
Embodiment
As shown in Figure 1, it is the electrical block diagram of the utility model one preferred embodiment Switching Power Supply 10, and shown Switching Power Supply 10 comprises: the first ac input end 111, second ac input end 112, varistor 113, first common mode inductance 150, second common mode inductance 160, 3rd common mode inductance 170, rectifying full bridge 180, PWM control integration circuit 190, metal-oxide-semiconductor 210, optocoupler 220, controllable accurate source of stable pressure 230, transformer 240, first resistance 301, second resistance 302, 3rd resistance 303, 4th resistance 304, 5th resistance 305, 6th resistance 306, 7th resistance 307, 8th resistance 308, 9th resistance 309, tenth resistance 310, 11 resistance 311, 12 resistance 312, 13 resistance 313, 14 resistance 314, 15 resistance 315, 16 resistance 316, 17 resistance 317, 18 resistance 318, first electric capacity 401, second electric capacity 402, 3rd electric capacity 403, 4th electric capacity 404, 5th electric capacity 405, 6th electric capacity 406, 7th electric capacity 407, 8th electric capacity 408, 9th electric capacity 409, tenth electric capacity 410, 11 electric capacity 411, first diode 510, first thermistor 520, second diode 530, 3rd diode 540, inductance 550, Schottky diode 560, first DC output end 570 and the second DC output end 580.
In the present embodiment, PWM control integration circuit 170 is OB2268 chip or OB2269 chip, has GATE end, VIN end, vdd terminal, RT end, SENSE end, FB end, RI end and GND end.
First ac input end 111 and the second ac input end 112 are connected with the first end of the first coil 151 in the first common mode inductance 150 and the first end of the second coil 152 respectively, and varistor 113 is connected with the first end of the first coil 151 in the first common mode inductance 150 and the first end of the second coil 152 respectively.
Varistor 113 is as a kind of votage limit type protection device; utilize its nonlinear characteristic; once the overtension being carried in the first ac input end 111 and the second ac input end 112 two ends; can by voltage clamping to a relatively-stationary magnitude of voltage, the surge preventing alternating current from bringing causes damage to late-class circuit.
First ac input end 111 and the second ac input end 112 are connected with the first end of the first coil 151 in the first common mode inductance 150 and the first end of the second coil 152 respectively, and varistor 113 is connected with the first end of the first coil 151 in the first common mode inductance 150 and the first end of the second coil 152 respectively.
First resistance 301 and the first electric capacity 401 are connected in parallel, and are connected with the second end of the first coil 151 in the first common mode inductance 150 and the second end of the second coil 152 respectively.When the first ac input end 111 and the second ac input end 112 stop the input AC signal of telecommunication; first common mode inductance 150 and/or the second common mode inductance 160 produce larger induced electromotive force; easily cause damage to late-class circuit, the shunt circuit of the first resistance 301 and the first electric capacity 401 composition can be played late-class circuit protective effect.
In second common mode inductance 160, the first end of the first coil 161 and the first end of the second coil 162 are connected with the first end of the first coil 151 in the first common mode inductance 150 and the first end of the second coil 152 respectively, in second common mode inductance 160, two ac input ends of the second end of the second end of the first coil 161 and the second coil 162 rectifying full bridge 180 respectively connect, and the second electric capacity 402 is connected with the direct current positive output end of rectifying full bridge 180 and direct current negative output terminal respectively.
The EMI filter action of the first common mode inductance 150 and the second common mode inductance 160 is passed through from the first ac input end 111 and the second ac input end 112 input AC signal of telecommunication, not only avoid electromagnetic interference signal, also can suppress electromagnetic wave outside radiation-emitting simultaneously, improve the stability of Switching Power Supply work.
VIN end is connected with the direct current positive output end of rectifying full bridge 180 by the second resistance 302, the grid of metal-oxide-semiconductor 210 is held with GATE by the 3rd resistance 303 and is connected, the grid of metal-oxide-semiconductor 180 is also by the 4th resistance 304 ground connection, the grid of metal-oxide-semiconductor 180 is also held with GATE by the 5th resistance 305, first diode 510 successively and is connected, the source electrode of metal-oxide-semiconductor 180 is held with SENSE by the 6th resistance 306 and is connected, the source electrode of metal-oxide-semiconductor 180 is also by the 7th resistance 307 ground connection, and SENSE end is by the 3rd electric capacity 403 ground connection.
RI end is by the 8th resistance 208 ground connection, RT end is successively by the 9th resistance 309, first thermistor 520 ground connection, GND holds ground connection, the drain electrode of metal-oxide-semiconductor 180 is connected with the positive pole of the second diode 530,4th electric capacity 404 is in parallel with the tenth resistance 310, and is connected with the negative pole of the second diode 530 and the direct current positive output end of rectifying full bridge 180 respectively.
The secondary coil 242 that transformer 240 comprises primary coil 241, be coupled with primary coil 241, the ancillary coil 243 be coupled with secondary coil 242.
The different name end of primary coil 241 is connected with the direct current positive output end of rectifying full bridge 180, the Same Name of Ends of primary coil 241 is connected with the drain electrode of metal-oxide-semiconductor 180, the Same Name of Ends of ancillary coil 243 is connected with the positive pole of the 3rd diode 540 by the tenth resistance 310, the negative pole of the 3rd diode 540 is connected with vdd terminal, the Same Name of Ends of ancillary coil 243 is also successively by the 11 resistance 311, the 5th electric capacity 405 ground connection, the different name end ground connection of ancillary coil 243, vdd terminal is by the 6th electric capacity 406 ground connection.
The Same Name of Ends of secondary coil 242 is connected with the first end of inductance 550 by the 7th electric capacity the 407, the 12 resistance 312 successively, the Same Name of Ends of secondary coil 242 is also connected with the first end of inductance 550 by Schottky diode 560,8th electric capacity 408 is in parallel with the 13 resistance 313, and is connected with the different name end of secondary coil 242 and the negative pole of Schottky diode 560 respectively.
In 3rd common mode inductance 170, the first end of the first coil 171 is connected with the second end of inductance 550, in 3rd common mode inductance 170, the first end of the second coil 172 is connected with the different name end of secondary coil 242, 14 resistance 314 and the 9th electric capacity 409 are connected in parallel between the first end of the first coil 171 in the 3rd common mode inductance 170 and the first end of the second coil 172, first output 570 and the second output 580 are connected with the second end of the first coil 171 in the 3rd common mode inductance 170 and the second end of the second coil 172 respectively, tenth electric capacity 410 is connected with the first output 570 and the second output 580 respectively.By Schottky diode 560, inductance 550 and the 3rd common mode inductance 170 can further by be mixed in DC signal alternating component, high-frequency signal filtering effect, make the first DC output end 570 and the second DC output end 580 export constant direct voltage and electric current, improve the stability of Switching Power Supply 10.
FB end is connected with the collector electrode of phototriode in optocoupler 220, the grounded emitter of phototriode in optocoupler 220, 11 electric capacity 411 is connected between the collector and emitter of phototriode in optocoupler 220, second end of inductance 550 is successively by the 15 resistance 315, 16 resistance 316 is connected with the negative pole end of controllable accurate source of stable pressure 230, in optocoupler 220, the positive pole of light-emitting diode is connected between the 15 resistance the 315 and the 16 resistance 316, in optocoupler 220, the negative pole of light-emitting diode is connected with the negative pole end of controllable accurate source of stable pressure 230, the negative pole end of controllable accurate source of stable pressure 230 is connected with the reference edge of controllable accurate source of stable pressure 230 by the 11 electric capacity 411, the reference edge of controllable accurate source of stable pressure 230 is connected with the positive terminal of controllable accurate source of stable pressure 230 by the 17 resistance 317, the reference edge of controllable accurate source of stable pressure 230 is connected with the second end of inductance 550 by the 18 resistance 318.
In the present embodiment, Switching Power Supply 10 also comprises resistance wire 610 and the second thermistor 620, first ac input end 111 is connected with the first end of the first coil 151 in the first common mode inductance 150 by resistance wire 610, and the second ac input end 112 is connected with the first end of the second coil 152 in the first common mode inductance 150 by the second thermistor 620.Second electric capacity 402 comprises polar capacitor C01 and polarity free capacitor C02, and polar capacitor C01 and polarity free capacitor C02 is in parallel.6th electric capacity 406 comprises polar capacitor C03 and polarity free capacitor C04, and polar capacitor C03 and polarity free capacitor C04 is in parallel.
In the present embodiment, Switching Power Supply 10 also comprises light-emitting diode the 630 and the 19 resistance 319,19 resistance 319 is connected with the second end of inductance 550 and the positive pole of light-emitting diode 630 respectively, and the negative pole of light-emitting diode 630 is connected with the positive pole of controllable accurate source of stable pressure 230.
Ac signal generates DC signal after the filter action of the rectification of rectifying full bridge 180, the second electric capacity 402, and charge to after the step-down of transformer 240 the 6th electric capacity 406, until be loaded on vdd terminal when reaching the starting resistor of PWM control integration circuit 170, PWM control integration circuit 170 is activated, and Switching Power Supply 10 could normal work.By changing the size of the 8th resistance 308 easily to the setting of PWM control integration circuit 170 operating frequency, and then the GATE of PWM control integration circuit 170 is regulated to hold cut-off and the turn-on frequency of driven MOS pipe 210.
As shown in Figure 2, the pwm signal change curve that exports with the GATE end of PWM control integration circuit 190 of its electric current being the drain electrode and source electrode of flowing through metal-oxide-semiconductor 210 shown in Fig. 1.The GATE of PWM control integration circuit 190 holds output pwm signal, to control turning on and off of metal-oxide-semiconductor 210.
The pwm signal voltage exported when the GATE end of PWM control integration circuit 190 is uprised by low, metal-oxide-semiconductor 210 is converted in opening state process by off state gradually, pwm signal arrives the grid of metal-oxide-semiconductor 210 via the 3rd resistance 303, relative to the rising edge curve A 01 that current i DS in prior art is formed, the rising edge curve B 01 that in ON-OFF control circuit 10, metal-oxide-semiconductor 210 is formed is more precipitous, thus shorten the service time of metal-oxide-semiconductor 210, 3rd resistance 303 is used for regulating the charging rate of electric capacity between metal-oxide-semiconductor 210 internal gate and source electrode, to control the transit time of opening of metal-oxide-semiconductor 210, avoid the transit time of opening because of metal-oxide-semiconductor 210 long and cause caloric value excessive, affect the useful life of metal-oxide-semiconductor 210.
When the pwm signal voltage of the GATE end output of PWM control integration circuit 190 is by high step-down, metal-oxide-semiconductor 210 is converted in off state process by opening state gradually, between metal-oxide-semiconductor 210 internal gate and source electrode, the electric charge of capacitance stores is discharged by the 5th resistance 305 and the first diode 510, relative to the trailing edge curve A 02 that current i DS in prior art is formed, the trailing edge curve B 02 that in ON-OFF control circuit 10, metal-oxide-semiconductor 210 is formed is more precipitous, realize the quick shutoff of metal-oxide-semiconductor 210, 5th resistance 305 is used for regulating the rate of release of the electric charge stored in metal-oxide-semiconductor 210, avoid the transit time because of the shutoff of metal-oxide-semiconductor 210 long and cause caloric value excessive, affect the useful life of metal-oxide-semiconductor 210.4th resistance 304 can form effective release path of electric charge, prevents the electric charge being accumulated in metal-oxide-semiconductor 210 grid from puncturing grid and the source electrode of metal-oxide-semiconductor 210.
Above-mentioned Switching Power Supply 10 is by the effect of the first common mode inductance 150, second common mode inductance 160, the 3rd common mode inductance 170 and varistor 113, output stability and fail safe preferably voltage and current, the surge effectively avoiding alternating current to bring is to the damage of electronic product being connected to the first DC output end 57 and the second DC output end 580.In addition, metal-oxide-semiconductor 210 is formed by the 3rd resistance 303 and opens path, and forms shutoff path by the 5th resistance 305 and the first diode 510, thus shortens the transit time turned on and off of metal-oxide-semiconductor 210, decrease the caloric value of metal-oxide-semiconductor 210, extend the useful life of metal-oxide-semiconductor 110.
Each technical characteristic of above embodiment can combine arbitrarily, for making description succinct, all possible combination of each technical characteristic in above-described embodiment is not all described, but, as long as the combination of these technical characteristics does not exist contradiction, be all considered to be the scope that this specification is recorded.
Above embodiment only have expressed several execution mode of the present utility model, and it describes comparatively concrete and detailed, but therefore can not be interpreted as the restriction to utility model patent scope.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection range of the present utility model.Therefore, the protection range of the utility model patent should be as the criterion with claims.
Claims (5)
1. a Switching Power Supply, it is characterized in that, comprise: the first ac input end, second ac input end, first common mode inductance, second common mode inductance, varistor, first electric capacity, first resistance, rectifying full bridge, second electric capacity, PWM control integration circuit, second resistance, metal-oxide-semiconductor, 3rd resistance, 4th resistance, 5th resistance, first diode, 6th resistance, 7th resistance, 3rd electric capacity, 8th resistance, 9th resistance, first thermistor, second diode, 4th electric capacity, transformer, tenth resistance, 3rd diode, 11 resistance, 5th electric capacity, 6th electric capacity, 7th electric capacity, 12 resistance, inductance, Schottky diode, 8th electric capacity, 13 resistance, 3rd common mode inductance, 14 resistance, 9th electric capacity, tenth electric capacity, optocoupler, 11 electric capacity, 15 resistance, 16 resistance, controllable accurate source of stable pressure, 17 resistance and the 18 resistance,
PWM control integration circuit has GATE end, VIN end, vdd terminal, RT end, SENSE end, FB end, RI end and GND end;
First ac input end and the second ac input end are connected with the first end of the first coil in the first common mode inductance and the first end of the second coil respectively, and varistor is connected with the first end of the first coil in the first common mode inductance and the first end of the second coil respectively;
First electric capacity is connected with the first resistor coupled in parallel, and is connected with the second end of the first coil in the first common mode inductance and the second end of the second coil respectively;
In second common mode inductance, the first end of the first coil and the first end of the second coil are connected with the first end of the first coil in the first common mode inductance and the first end of the second coil respectively, in second common mode inductance, two ac input ends of the second end of the second end of the first coil and the second coil rectifying full bridge respectively connect, and the second electric capacity is connected with the direct current positive output end of rectifying full bridge and direct current negative output terminal respectively;
VIN end is connected with the direct current positive output end of rectifying full bridge by the second resistance, the grid of metal-oxide-semiconductor is held with GATE by the 3rd resistance and is connected, the grid of metal-oxide-semiconductor is also by the 4th grounding through resistance, the grid of metal-oxide-semiconductor is also held with GATE be connected by the 5th resistance, the first diode successively, the source electrode of metal-oxide-semiconductor is held with SENSE by the 6th resistance and is connected, the source electrode of metal-oxide-semiconductor is also by the 7th grounding through resistance, and SENSE end is by the 3rd capacity earth;
RI end is by the 8th grounding through resistance, RT end is successively by the 9th resistance, the first thermistor ground connection, GND holds ground connection, the drain electrode of metal-oxide-semiconductor is connected with the positive pole of the second diode, 4th electric capacity and the 9th resistor coupled in parallel, and be connected with the negative pole of the second diode and the direct current positive output end of rectifying full bridge respectively;
The secondary coil that transformer comprises primary coil, be coupled with primary coil, the ancillary coil be coupled with secondary coil;
The different name end of primary coil is connected with the direct current positive output end of rectifying full bridge, the Same Name of Ends of primary coil is connected with the drain electrode of metal-oxide-semiconductor, the Same Name of Ends of ancillary coil is connected with the positive pole of the 3rd diode by the tenth resistance, the negative pole of the 3rd diode is connected with vdd terminal, the Same Name of Ends of ancillary coil is also successively by the 11 resistance, the 5th capacity earth, the different name end ground connection of ancillary coil, vdd terminal is by the 6th capacity earth;
The Same Name of Ends of secondary coil is connected with the first end of inductance by the 7th electric capacity, the 12 resistance successively, the Same Name of Ends of secondary coil is also connected with the first end of inductance by Schottky diode, 8th electric capacity and the 13 resistor coupled in parallel, and be connected with the different name end of secondary coil and the negative pole of Schottky diode respectively;
In 3rd common mode inductance, the first end of the first coil is connected with the second end of inductance, in 3rd common mode inductance, the first end of the second coil is connected with the different name end of secondary coil, between the first end of the 14 resistance and the 9th Capacitance parallel connection first coil in the 3rd common mode inductance and the first end of the second coil, first output and the second output are connected with the second end of the first coil in the 3rd common mode inductance and the second end of the second coil respectively, and the tenth electric capacity is connected with the first output and the second output respectively;
FB end is connected with the collector electrode of phototriode in optocoupler, the grounded emitter of phototriode in optocoupler, 11 electric capacity is connected between the collector and emitter of phototriode in optocoupler, second end of inductance is successively by the 15 resistance, 16 resistance is connected with the negative pole end of controllable accurate source of stable pressure, in optocoupler, the positive pole of light-emitting diode is connected between the 15 resistance and the 16 resistance, in optocoupler, the negative pole of light-emitting diode is connected with the negative pole end of controllable accurate source of stable pressure, the negative pole end of controllable accurate source of stable pressure is connected with the reference edge of controllable accurate source of stable pressure by the 11 electric capacity, the reference edge of controllable accurate source of stable pressure is connected with the positive terminal of controllable accurate source of stable pressure by the 17 resistance, the reference edge of controllable accurate source of stable pressure is connected with the second end of inductance by the 18 resistance.
2. Switching Power Supply according to claim 1, it is characterized in that, also comprise resistance wire and the second thermistor, first ac input end is connected with the first end of the first coil in the first common mode inductance by resistance wire, and the second ac input end is connected with the first end of the second coil in the first common mode inductance by the second thermistor.
3. Switching Power Supply according to claim 1, is characterized in that, the second electric capacity comprises polar capacitor and polarity free capacitor, polar capacitor and polarity free capacitor parallel connection.
4. Switching Power Supply according to claim 1, is characterized in that, the 6th electric capacity comprises polar capacitor and polarity free capacitor, polar capacitor and polarity free capacitor parallel connection.
5. Switching Power Supply according to claim 1, it is characterized in that, also comprise light-emitting diode and the 19 resistance, the 19 resistance respectively the second end of inductance and the positive pole of light-emitting diode connects, and the negative pole of light-emitting diode is connected with the positive pole of controllable accurate source of stable pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520092402.9U CN204392106U (en) | 2015-02-06 | 2015-02-06 | Switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520092402.9U CN204392106U (en) | 2015-02-06 | 2015-02-06 | Switching power supply |
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| Publication Number | Publication Date |
|---|---|
| CN204392106U true CN204392106U (en) | 2015-06-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520092402.9U Expired - Fee Related CN204392106U (en) | 2015-02-06 | 2015-02-06 | Switching power supply |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888066A (en) * | 2017-12-28 | 2018-04-06 | 浙江正泰仪器仪表有限责任公司 | A kind of inverse-excitation type switch power-supply circuit |
| CN108155782A (en) * | 2018-01-31 | 2018-06-12 | 常州斯坦博电子科技有限公司 | Flyback restores power circuit |
-
2015
- 2015-02-06 CN CN201520092402.9U patent/CN204392106U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107888066A (en) * | 2017-12-28 | 2018-04-06 | 浙江正泰仪器仪表有限责任公司 | A kind of inverse-excitation type switch power-supply circuit |
| CN108155782A (en) * | 2018-01-31 | 2018-06-12 | 常州斯坦博电子科技有限公司 | Flyback restores power circuit |
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