CN204145287U - Switching power supply protection circuit - Google Patents
Switching power supply protection circuit Download PDFInfo
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- CN204145287U CN204145287U CN201420621135.5U CN201420621135U CN204145287U CN 204145287 U CN204145287 U CN 204145287U CN 201420621135 U CN201420621135 U CN 201420621135U CN 204145287 U CN204145287 U CN 204145287U
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- 230000001681 protective effect Effects 0.000 claims description 37
- 230000001939 inductive effect Effects 0.000 claims description 8
- 230000015556 catabolic process Effects 0.000 abstract description 4
- 239000000872 buffer Substances 0.000 abstract 1
- 239000003990 capacitor Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 5
- 239000004568 cement Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000010349 pulsation Effects 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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Abstract
The utility model provides a switching power supply protection circuit increases resistance-capacitance circuit between switching power supply and rectifier circuit. When instantaneous high voltage, surge high voltage or continuous high voltage, the resistance-capacitance circuit absorbs and buffers most of high voltage, forms protection to the whole power supply circuit, avoids the chip of the switching power supply from being broken down by voltage and then being developed into current breakdown, and finally causes the chip of the switching power supply to be permanently short-circuited or broken due to joule heat greatly increased by current breakdown current.
Description
Technical field
The utility model relates to switch power technology field, particularly relates to a kind of protective circuit of switch power source.
Background technology
Along with people more and more rely on household electrical appliance, the effect of household electrical appliance in family life is increasing.Especially some daily household electrical appliance, as electromagnetic oven etc., frequency of utilization is very high especially.In the process using these household electrical appliance, open and close power supply and to be inevitable operation.And the safety of Switching Power Supply itself and reliability, can also become these household electrical appliance the prerequisite of safe and reliable work.Therefore, ensure that the safety of these Switching Power Supplies is with reliable, needs to increase protective circuit of switch power source.
Current common technology is in the zero line of a power supply piezo-resistance in parallel with between live wire.The protected mode of effect in parallel, could conducting must shield, and the time of protection is also very short under certain high pressure; once short time voltage does not lower; also can easily piezo-resistance be burnt, just never again protective effect and, piezo-resistance itself is easily aging.Once piezo-resistance is aging, when running into the situation of continuous high-pressure, the shell of encapsulation piezo-resistance is easy to catch fire, and because of the damage of its whole Switching Power Supply, electrical equipment finally also can be caused thoroughly to damage.
Utility model content
The purpose of this utility model is to provide a kind of protective circuit of switch power source, when voltage raises suddenly, absorbs high voltage and the voltage of stable switch both ends of power, prevents Switching Power Supply from being damaged by instantaneous high pressure, continuous high-pressure or high voltage surge.
A kind of protective circuit of switch power source, comprising:
Rectifier bridge, the first resistance, the second resistance, resistance-capacitance circuit and Switching Power Supply;
Wherein, the first end of described first resistance is connected with the positive pole of described rectifier bridge, and the second end is connected with the first end of described second resistance;
Second end of described second resistance is connected with the first end of described Switching Power Supply;
Second end of described Switching Power Supply is connected with the negative pole of described rectifier bridge;
The first end of described resistance-capacitance circuit is connected with the second end of described first resistance, and the second end is connected with the negative pole of described rectifier bridge.
Preferably, described resistance-capacitance circuit comprises:
First electric capacity, the second electric capacity, the 3rd resistance and the 4th resistance;
Wherein, the positive pole of described first electric capacity is connected with the second end of described first resistance, and negative pole is connected with the negative pole of described rectifier bridge;
The first end of described second electric capacity is connected with the positive pole of described first electric capacity, and the second end is connected with the negative pole of described first electric capacity;
The first end of described 3rd resistance is connected with the first end of described second electric capacity, and the second end is connected with the first end of described 4th resistance;
Second end of described 4th resistance is connected with the second end of described second electric capacity.
Preferably, described protective circuit of switch power source also comprises:
PNP type triode, the first diode, the second diode and the 5th resistance;
Wherein, the negative pole of described first diode is connected with the second end of described second electric capacity, and positive pole is connected with the negative pole of described first electric capacity;
The positive pole of described second diode is connected with the second end of described 3rd resistance, and negative pole is connected with the first end of described 4th resistance;
The first end of described 5th resistance is connected with the second end of described first resistance, and the second end is connected with the emitter of described PNP type triode;
The collector electrode of described PNP type triode is connected with the first end of described second resistance, and base stage is connected with the second end of described second electric capacity and is connected with the negative pole of described second diode.
Preferably, described 5th resistance is inductive resistance.
Preferably, described second resistance is thermistor.
Preferably, described protective circuit of switch power source also comprises:
NPN type triode, the first diode, the second diode and the 5th resistance;
Wherein, the negative pole of described first diode is connected with the positive pole of described first electric capacity, and positive pole is connected with the first end of described second electric capacity;
The positive pole of described second diode is connected with the second end of described 4th resistance, and negative pole is connected with the second end of described second electric capacity;
The collector electrode of described NPN type triode is connected with the second end of described Switching Power Supply, and base stage is connected with the positive pole of described first diode and is connected with the second end of described 3rd resistance, and emitter is connected with the first end of described 5th resistance;
Second end of described 5th resistance is connected with the negative pole of described rectifier bridge.
Preferably, described 5th resistance is inductive resistance.
Preferably, described second resistance is thermistor.
Preferably, described resistance-capacitance circuit comprises:
First electric capacity, the second electric capacity, the 3rd resistance, the 4th resistance and the 5th resistance;
The positive pole of described first electric capacity is connected with the second end of described 5th resistance, and negative pole is connected with the negative pole of described rectifier bridge;
The first end of described 3rd resistance is connected with the second end of described first resistance, and the second end is connected with the first end of described 4th resistance;
Second end of described 4th resistance is connected with the negative pole of described rectifier bridge;
The first end of described 5th resistance is connected with the first end of described 3rd resistance, and the second end is connected with the first end of described second resistance;
The positive pole of described second electric capacity is connected with the first end of described 4th resistance, and negative pole is connected with the second end of described 4th resistance.
Preferably, described second resistance is inductive resistance.
Therefore, the utility model has following beneficial effect:
The utility model provides a kind of protective circuit of switch power source, between Switching Power Supply and rectification circuit, increase resistance-capacitance circuit.When instantaneous high pressure, high voltage surge or continuous high-pressure; resistance-capacitance circuit absorbs and cushions most of high pressure; protection is formed to whole power circuit; avoid the chip of Switching Power Supply to be that electric current punctures by voltage breakdown developing deeply, finally cause joule's heat energy that switching power source chip increases because of electric current breakdown current thoroughly by chip permanent short or open circuit.
Accompanying drawing explanation
The connection diagram of the protective circuit of switch power source that Fig. 1 one of providing for the utility model is total;
The connection diagram of the protective circuit of switch power source that Fig. 2 one of providing for the utility model is concrete;
The connection diagram of another concrete protective circuit of switch power source that Fig. 3 provides for the utility model;
The connection diagram of another concrete protective circuit of switch power source that Fig. 4 provides for the utility model;
The connection diagram of another concrete protective circuit of switch power source that Fig. 5 provides for the utility model.
Embodiment
Core of the present utility model is to provide a kind of protective circuit of switch power source, when voltage raises suddenly, absorbs high voltage and the voltage of stable switch both ends of power, prevents Switching Power Supply from being damaged by instantaneous high pressure, continuous high-pressure or high voltage surge.
In order to make those skilled in the art person understand the utility model scheme better, below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
In protective circuit of switch power source disclosed in the utility model, see Fig. 1, comprising:
First resistance 101, second resistance 102, resistance-capacitance circuit 20, Switching Power Supply 30 and rectifier bridge 40;
Wherein, the first end of the first resistance 101 is connected with the positive pole of rectifier bridge 40, and the second end is connected with the first end of the second resistance 102.Second end of the second resistance 102 is connected with the first end of Switching Power Supply 30.Second end of Switching Power Supply 30 is connected with the negative pole of rectifier bridge 40.The first end of resistance-capacitance circuit 20 is connected with the second end of described first resistance 101, and the second end is connected with the negative pole of rectifier bridge 40.
In switching power circuit, need rectifier bridge 40 that the alternating current of 220 volts is first converted to the direct current of pulsation, to adapt to the power demands of general household electrical appliances.
In protective circuit of switch power source, two resistance comprised are the first resistance 101 and the second resistance 102 respectively.First resistance 101 can be the cement resistor generally commonly used, and resistance is 22 ohm.Second resistance 102 is general resistance, desirable 10 ohms of resistance value.
The circuit that resistance-capacitance circuit 20 is made up of resistance and electric capacity.In resistance-capacitance circuit, two class devices absorb instant high-voltage or high voltage surge through the mode of series and parallel connections.Concrete principle is that the characteristic that electric capacity both end voltage is not suddenlyd change can keep voltage stabilization, and resistance has certain resistance, thus absorbs a part of voltage.
For Switching Power Supply, when circuit voltage raises, electric capacity can by voltage stabilization in the voltage range that circuit normally works in its withstand voltage scope.Meanwhile, resistance absorption portion voltage.Like this, Switching Power Supply is caused to damage with regard to preventing Switching Power Supply both end voltage to raise along with instantaneous high pressure, high voltage surge or continuous high-pressure.
In the embodiment of the utility model another protective circuit of switch power source disclosed, see Fig. 2, resistance-capacitance circuit comprises two electric capacity and two resistance.Protective circuit of switch power source specifically comprises following device:
First resistance 101, second resistance 102, Switching Power Supply 30, rectifier bridge 40, first electric capacity 201, second electric capacity 202, the 3rd resistance 203 and the 4th resistance 204;
The first end of the first resistance 101 is connected with the positive pole of rectifier bridge 40, and the second end is connected with the first end of the second resistance 102 and the positive pole of the first electric capacity 201.The negative pole of the first electric capacity 201 is connected with the negative pole of rectifier bridge 40.The first end of the second electric capacity 202 is connected with the positive pole of the first electric capacity 201, and the second end is connected with the negative pole of the first electric capacity 201.The first end of the 3rd resistance 203 is connected with the first end of the second electric capacity 202, and the second end is connected with the first end of the 4th resistance 204.Second end of the 4th resistance 204 is connected with the second end of the second electric capacity 202.Second end of the second resistance 102 is connected with the first end of Switching Power Supply 30.Second end of Switching Power Supply 30 is connected with the negative pole of rectifier bridge 40.
Electrolytic capacitor is widely used in household electrical appliance and various electronic product, and its range of capacity is comparatively large, and be generally 1 microfarad to 1000 microfarads, rated operational voltage scope is 6.3 volts to 450 volts.In the utility model, the first electric capacity 201 can select the electrochemical capacitor that general household electrical appliance are conventional, withstand voltage can be selected to be 450 volts, the electrochemical capacitor of capacity 10 μ F.Electrochemical capacitor, has dividing of both positive and negative polarity, thus both positive and negative polarity can not be connect instead.
Second electric capacity 202 can select withstand voltage hundreds of volt, capacity in 1 microfarad to hundreds of microfarad.
3rd resistance 203 desirable 10 ohm at the present embodiment, the 4th resistance 204 gets 1000 kilohms.
Certainly, in the other cases, electric capacity and the resistance of other parameters can be selected as required.A just concrete value example herein, does not illustrate the numerical value that parameter value can only be taken as the present embodiment and provide.
Under normal circumstances, the alternating current of 220 volts is carried out full-wave rectification by rectifier bridge 40, forms the direct current of the pulsation of 220 volts, after first resistance 101 of 22 ohm, charges to the first electric capacity 201 and the second electric capacity 202.When the voltage rise of the first electric capacity 201 is after certain value, the second electric capacity 202 also rises to certain value.Two electric capacity keep respective both end voltage to stablize, and also namely Switching Power Supply 30 can pass through the second resistance 102 conducting under stable voltage, and Switching Power Supply normally works.
When the both end voltage of rectifier bridge 40 raises, after first the first resistance 101 share certain voltage, the successively charging of the first electric capacity 201 and the second electric capacity 202, the voltage at electric capacity two ends does not all suddenly change, and keeps certain stationary value.3rd resistance 203 and the 4th resistance 204 share portion voltage.The high voltage now raised suddenly is through the charging and voltage stabilizing of two electric capacity, and each resistance can both share portion voltage.Switching Power Supply 30 still normally can work under stable voltage.
In the embodiment of the utility model another protective circuit of switch power source disclosed, see Fig. 3, this circuit comprises:
First resistance 101, second resistance 102, Switching Power Supply 30, rectifier bridge 40, first electric capacity 201, second electric capacity 202, the 3rd resistance 203, the 4th resistance 204, the 5th resistance 50, first diode 601, second diode 602 and PNP type triode 70;
The first end of the first resistance 101 is connected with the positive pole of rectifier bridge 40, and the second end is connected with the first end of the 5th resistance 50 and the positive pole of the first electric capacity 201.
The negative pole of the first electric capacity 201 is connected with the negative pole of rectifier bridge 40.
The first end of the second electric capacity 202 is connected with the positive pole of the first electric capacity 201, and the second end is connected with the negative pole of the first diode 601.The positive pole of the first diode 601 is connected with the negative pole of the first electric capacity 201.
The first end of the 3rd resistance 203 is connected with the first end of the second electric capacity 202, and the second end is connected with the positive pole of the second diode 602.The negative pole of the second diode 602 is connected with the first end of the 4th resistance 204.Second end of the 4th resistance 204 is connected with the positive pole of the first diode 601.
Second end of the 5th resistance 50 is connected with the emitter of PNP type triode 70.The collector electrode of PNP type triode 70 is connected with the first end of the second resistance 102, and base stage is connected with the second end of the second electric capacity 202 and is connected with the negative pole of the second diode 602.Second end of the second resistance 102 is connected with the first end of Switching Power Supply 30.Second end of Switching Power Supply 30 is connected with the negative pole of rectifier bridge.
Wherein, the first resistance 101 adopts general cement resistor, resistance 22 ohm.Second resistance 102 can use thermistor, can guarantee like this to cause adstante febre at big current, and the second resistance raises, and absorbs big current.3rd resistance 203 can adopt resistance to be the resistance of 10 ohm.4th resistance 204 adopts resistance to be the resistance of 1000 kilohms, shares certain voltage when high voltage, maintenance circuitry stable.5th resistance 50 is inductor resistance, and after the branch road conducting of the 3rd resistance and the second diode composition, the just conducting of the 5th resistance 50, to the effect through the voltage that resistance-capacitance circuit 20 absorbed above with buffering.
First diode 601 and the second diode 602 are rectifier diode, the wherein anti-phase series connection of the first diode 601, can also absorb self induction voltage and the electric current of Switching Power Supply 30 self generation.
After the conducting of PNP type triode 70 forward bias, through the second resistance 102 just by Switching Power Supply 30.In the present embodiment, the parameter selecting amplification factor of triode is 50 times, and withstand voltage is hundreds of volt.
When continuous high-pressure; the branch road of the 3rd resistance 203, second diode 602 and the 4th resistance 204 composition can absorb a part of voltage in the mode of approximate pure resistance; and the PNP type triode 70 being in magnifying state also can share a part of high pressure; the electric current that continuous high-pressure is formed is by the second resistance 102; the second resistance 102 is caused to generate heat; its sensitive characteristic causes its resistance to increase, thus protection switch power supply 30.
After this protective circuit of switch power source connects civil power, the line voltage of 220 volts forms Rectified alternating current after rectifier bridge 40 full-wave rectification.After the first resistance 101, charge first to the first electric capacity 201.After the both end voltage of the first electric capacity 201 rises to particular value, the second electric capacity 202 forms loop by the 4th resistance 204 and charges and rise to certain value.After this, the branch road conducting of the 3rd resistance 203, second diode 602 and the 4th resistance 204 composition.After aforementioned branch road conducting, because the 5th resistance 50 is inductive resistance, thus the 5th resistance 50 just conducting after the 3rd resistance 203 conducting.Now the emitter of PNP type triode 70 and base stage form forward PN and save, and triode is forward bias conducting.Switching Power Supply 30 through PNP type triode 70 and the second resistance 102 conducting, Switching Power Supply work.
Above-mentioned resistance-capacitance circuit, diode, triode, thermistor and inductive resistance have different protective effects to Switching Power Supply respectively, prevent high voltage, surge voltage, big current and continuous high-pressure to the impact of Switching Power Supply.
The present embodiment provides each period, parameter was only as a kind of concrete Selecting parameter, in varied situations, needed to select other parameters according to difference.
In the embodiment of the utility model another protective circuit of switch power source disclosed, see Fig. 4, this protective circuit comprises:
First resistance 101, second resistance 102, Switching Power Supply 30, rectifier bridge 40, first electric capacity 201, second electric capacity 202, the 3rd resistance 203, the 4th resistance 204, the 5th resistance 50, first diode 601, second diode 602 and NPN type triode 80;
The first end of the first resistance 101 is connected with the positive pole of rectifier bridge 40, and the second end is connected with the first end of the second resistance 102 and the positive pole of the first electric capacity 201.The negative pole of the first electric capacity 201 is connected with the negative pole of rectifier bridge 40.
The negative pole of the first diode 601 is connected with the positive pole of the first electric capacity 201, and negative pole is connected with the first end of the second electric capacity 202.Second end of the second electric capacity 202 is connected with the negative pole of the first electric capacity 201.
The first end of the 3rd resistance 203 is connected with the second end of the first resistance 101, and the second end is connected with the first end of the 4th resistance 204.Second end of the 4th resistance 204 is connected with the positive pole of the second diode 602.The negative pole of the second diode 602 is connected with the second end of the second electric capacity 202.
Second end of the second resistance 102 is connected with the first end of Switching Power Supply 30.Second end of Switching Power Supply 30 is connected with the collector electrode of NPN type triode 80.The base stage of NPN type triode 80 is connected with the positive pole of the first diode 601 and is connected with the second end of the 3rd resistance 203, and emitter is connected with the first end of the 5th resistance 50.Second end of the 5th resistance 50 is connected with the negative pole of rectifier bridge 40.
In the present embodiment, change PNP type triode 70 into NPN type triode 80, its principle is same as the previously described embodiments, certainly, because the difference of triode, ensure that triode normally works, so symmetric change is carried out in the connection that corresponding device comprises the 3rd resistance 203, second diode 602 and the 4th resistance 204.
In the present embodiment, the parameter of each device can be consistent with above-described embodiment, also can according to the corresponding change of different situations.
In the embodiment of the utility model another protective circuit of switch power source disclosed, see Fig. 5, this circuit comprises:
First resistance 101, second resistance 102, Switching Power Supply 30, rectifier bridge 40, first electric capacity 205, second electric capacity 206, the 3rd resistance 207, the 4th resistance 208 and the 5th resistance 209;
The first end of the first resistance 101 is connected with the positive pole of rectifier bridge 40, and the second end is connected with the first end of the 3rd resistance 207.
Second end of the 3rd resistance 207 is connected with the first end of the 4th resistance 208.Second end of the 4th resistance 208 is connected with the negative pole of rectifier bridge 40.The positive pole of the second electric capacity 206 is connected with the first end of the 4th resistance 208, and negative pole is connected with the second end of the 4th resistance 208.
The first end of the 5th resistance 209 is connected with the first end of the 3rd resistance 203, and the second end is connected with the first end of the second resistance 102.
Second end of the second resistance 102 is connected with the first end of Switching Power Supply 30.Second end of Switching Power Supply 30 is connected with the negative pole of rectifier bridge.
The positive pole of the first electric capacity 205 is connected with the second end of the 5th resistance 209, and negative pole is connected with the negative pole of rectifier bridge 40.
Here, first electric capacity 205 and the second electric capacity 206 are electrochemical capacitor, and the first electric capacity 205 can adopt withstand voltage to be 450 volts, the electrochemical capacitor of capacity 10 μ F, second electric capacity 206 can adopt resistance to pressure energy to reach hundreds of volt, and capacity is at the electrochemical capacitor of 10 microfarads to hundreds of microfarad.And select the capacity of the second electric capacity to be not less than the first capacitance.
Second resistance 102 adopts inductor resistance, and resistance is 200 ohms.
Other resistance each uses conventional, electric-resistance, and the design parameter of each resistance is:
First resistance is 101 general cement resistors, resistance 22 ohm.3rd resistance 207 adopts resistance to be the resistance of 50 ohms, and the 4th resistance 208 can adopt resistance to be the resistance of 1000 kilohms.5th resistance 209 can adopt resistance to be the resistance of 100 ohm.
Certainly, each device parameters that the present embodiment adopts is only a kind of concrete scheme, does not represent the Selecting parameter that can only adopt the present embodiment.In a practical situation, other Selecting parameter can be made.
The alternating current of 220 volts is carried out full-wave rectification by rectifier bridge 40, forms the direct current of the pulsation of 220 volts, after first resistance 101 of 22 ohm, charges to the first electric capacity 205 and the second electric capacity 206.Because the 5th resistance 209 is greater than the 3rd resistance 207, second electric capacity 206 capacity and is not less than the first electric capacity 205, cause the branch road that most of electric current consists of the 3rd resistance 207 and the second electric capacity 206.When the second electric capacity 206 both end voltage rises to maximum, the first electric capacity 205 both end voltage does not also reach maximum.After the first electric capacity 205 both end voltage rises to maximum, the first electric capacity 205 discharges through the second resistance 102.Switching Power Supply 30, by the second resistance 102 conducting, forms loop with rectifier bridge 40, switching power circuit work.
Above utility model provided by the utility model is described in detail.Apply specific case herein to set forth principle of the present utility model and execution mode, the explanation of above embodiment just understands the utility model and core concept thereof for helping.Should be understood that; for those skilled in the art; under the prerequisite not departing from the utility model principle, can also carry out some improvement and modification to the utility model, these improve and modify and also fall in the protection range of the utility model claim.
Claims (10)
1. a protective circuit of switch power source, is characterized in that, comprising:
Rectifier bridge, the first resistance, the second resistance, resistance-capacitance circuit and Switching Power Supply;
Wherein, the first end of described first resistance is connected with the positive pole of described rectifier bridge, and the second end is connected with the first end of described second resistance;
Second end of described second resistance is connected with the first end of described Switching Power Supply;
Second end of described Switching Power Supply is connected with the negative pole of described rectifier bridge;
The first end of described resistance-capacitance circuit is connected with the second end of described first resistance, and the second end is connected with the negative pole of described rectifier bridge.
2. protective circuit of switch power source as claimed in claim 1, it is characterized in that, described resistance-capacitance circuit comprises:
First electric capacity, the second electric capacity, the 3rd resistance and the 4th resistance;
Wherein, the positive pole of described first electric capacity is connected with the second end of described first resistance, and negative pole is connected with the negative pole of described rectifier bridge;
The first end of described second electric capacity is connected with the positive pole of described first electric capacity, and the second end is connected with the negative pole of described first electric capacity;
The first end of described 3rd resistance is connected with the first end of described second electric capacity, and the second end is connected with the first end of described 4th resistance;
Second end of described 4th resistance is connected with the second end of described second electric capacity.
3. protective circuit of switch power source as claimed in claim 2, it is characterized in that, described protective circuit of switch power source also comprises:
PNP type triode, the first diode, the second diode and the 5th resistance;
Wherein, the negative pole of described first diode is connected with the second end of described second electric capacity, and positive pole is connected with the negative pole of described first electric capacity;
The positive pole of described second diode is connected with the second end of described 3rd resistance, and negative pole is connected with the first end of described 4th resistance;
The first end of described 5th resistance is connected with the second end of described first resistance, and the second end is connected with the emitter of described PNP type triode;
The collector electrode of described PNP type triode is connected with the first end of described second resistance, and base stage is connected with the second end of described second electric capacity and is connected with the negative pole of described second diode.
4. protective circuit of switch power source as claimed in claim 3, it is characterized in that, described 5th resistance is inductive resistance.
5. protective circuit of switch power source as claimed in claim 3, it is characterized in that, described second resistance is thermistor.
6. protective circuit of switch power source as claimed in claim 2, it is characterized in that, described protective circuit of switch power source also comprises:
NPN type triode, the first diode, the second diode and the 5th resistance;
Wherein, the negative pole of described first diode is connected with the positive pole of described first electric capacity, and positive pole is connected with the first end of described second electric capacity;
The positive pole of described second diode is connected with the second end of described 4th resistance, and negative pole is connected with the second end of described second electric capacity;
The collector electrode of described NPN type triode is connected with the second end of described Switching Power Supply, and base stage is connected with the positive pole of described first diode and is connected with the second end of described 3rd resistance, and emitter is connected with the first end of described 5th resistance;
Second end of described 5th resistance is connected with the negative pole of described rectifier bridge.
7. protective circuit of switch power source as claimed in claim 6, it is characterized in that, described 5th resistance is inductive resistance.
8. protective circuit of switch power source as claimed in claim 6, it is characterized in that, described second resistance is thermistor.
9. protective circuit of switch power source as claimed in claim 1, it is characterized in that, described resistance-capacitance circuit comprises:
First electric capacity, the second electric capacity, the 3rd resistance, the 4th resistance and the 5th resistance;
The positive pole of described first electric capacity is connected with the second end of described 5th resistance, and negative pole is connected with the negative pole of described rectifier bridge;
The first end of described 3rd resistance is connected with the second end of described first resistance, and the second end is connected with the first end of described 4th resistance;
Second end of described 4th resistance is connected with the negative pole of described rectifier bridge;
The first end of described 5th resistance is connected with the first end of described 3rd resistance, and the second end is connected with the first end of described second resistance;
The positive pole of described second electric capacity is connected with the first end of described 4th resistance, and negative pole is connected with the second end of described 4th resistance.
10. protective circuit of switch power source as claimed in claim 9, it is characterized in that, described second resistance is inductive resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420621135.5U CN204145287U (en) | 2014-10-23 | 2014-10-23 | Switching power supply protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420621135.5U CN204145287U (en) | 2014-10-23 | 2014-10-23 | Switching power supply protection circuit |
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| Publication Number | Publication Date |
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| CN204145287U true CN204145287U (en) | 2015-02-04 |
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| CN201420621135.5U Expired - Fee Related CN204145287U (en) | 2014-10-23 | 2014-10-23 | Switching power supply protection circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114123787A (en) * | 2021-11-09 | 2022-03-01 | 珠海格力电器股份有限公司 | Switching power supply circuit and switching power supply |
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2014
- 2014-10-23 CN CN201420621135.5U patent/CN204145287U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114123787A (en) * | 2021-11-09 | 2022-03-01 | 珠海格力电器股份有限公司 | Switching power supply circuit and switching power supply |
| CN114123787B (en) * | 2021-11-09 | 2023-10-10 | 珠海格力电器股份有限公司 | Switching power supply circuit and switching power supply |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
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Granted publication date: 20150204 Termination date: 20211023 |