CN104426353A - Switching power circuit, lighting device, and charger - Google Patents
Switching power circuit, lighting device, and charger Download PDFInfo
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- CN104426353A CN104426353A CN201310378687.8A CN201310378687A CN104426353A CN 104426353 A CN104426353 A CN 104426353A CN 201310378687 A CN201310378687 A CN 201310378687A CN 104426353 A CN104426353 A CN 104426353A
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- 238000001914 filtration Methods 0.000 claims abstract description 25
- 239000003990 capacitor Substances 0.000 claims description 29
- 230000000087 stabilizing effect Effects 0.000 claims description 10
- 238000004804 winding Methods 0.000 claims description 9
- 239000004065 semiconductor Substances 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 abstract 3
- 230000000452 restraining effect Effects 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 4
- 230000001629 suppression Effects 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 229910052710 silicon Inorganic materials 0.000 description 3
- 239000010703 silicon Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007704 transition Effects 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
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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
- H02M1/44—Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
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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
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- H02J2007/10—
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
Abstract
Embodiments of the invention disclose a switching power circuit, a lighting device, and a charger. The switching power circuit comprises a rectifier filtering module, an absorption circuit module, a high-frequency transformer, a switching control module, and an output rectifier filtering module. The rectifier filtering module is connected with the absorption circuit module. The absorption circuit module is connected with the switching control module and the high-frequency transformer. The high-frequency transformer is connected with the switching control module and the output rectifier filtering module. Using the switching power circuit, electromagnetic interference is effectively restrained and the circuit is purified, thereby achieving an objective of restraining conducted interference. The switching power electromagnetic interference rejection circuit has few changes, and is simple in structure and low in cost.
Description
Technical field
The present invention relates to power circuit design field, particularly relate to a kind of switching power circuit, lighting device and charger.
Background technology
EMC(Electro Magnetic Compatibility, Electro Magnetic Compatibility), refer to that equipment or system normally can work and any equipment in its environment do not produced to the ability of intolerable electromagnetic interference in its electromagnetic environment.It comprises the requirement of two aspects: have certain repellence under the electromagnetic interference that the equipment that refers on the one hand produces at residing environment, can normally run; Refer to that equipment can not exceed certain limit value to the electromagnetic interference that place environment produces in normal course of operation on the other hand, the normal work of other equipment can not be affected.
In prior art; mainly add X electric capacity, common mode inductance filter, differential mode inductance, piezo-resistance, thermistor, Y capacitance etc. at power input stage, form the suppression that the functional circuit such as filtering and protection is realized electromagnetic interference in switching power circuit.The relative traditional switch power circuit of the method changes comparatively large, and structure is comparatively complicated, and cost is relatively high.
Summary of the invention
Embodiment of the present invention technical problem to be solved is, provides a kind of switching power circuit, and this circuit structure is relatively simple, effectively can realize the suppression to electromagnetic interference in circuit.
In order to solve the problems of the technologies described above, embodiments provide a kind of switching power circuit, comprise rectification filtering module, absorbing circuit module, high frequency transformer, switch control module and output rectification filter module, described rectification filtering module and described absorbing circuit model calling, described absorbing circuit module is connected with described switch control module and described high frequency transformer respectively, described high frequency transformer respectively with described switch control module and described output rectification filter model calling;
Described absorbing circuit module comprises resistance R2, resistance R4, electric capacity C5 and diode D2, wherein, described resistance R2 and described electric capacity C5 is connected in parallel, one end of described resistance R2 is connected with described high frequency transformer, the other end of described resistance R2 is connected with one end of described resistance R4, the other end of described resistance R4 is connected with the negative electrode of described diode D2, and the anode of described diode D2 is connected with described switch control module.
Wherein, described rectification filtering module comprises:
Rectifier bridge D1, inductance L 1, filter capacitor C1 and filter capacitor C2;
The output of described rectifier bridge D1 is connected with described filter capacitor C1, the input incoming transport power supply of described rectifier bridge, one end of described inductance L 1 is connected with the anode of described filter capacitor C1, the other end of described inductance L 1 is connected with the anode of described filter capacitor C2, the minus earth of described filter capacitor C2.
Wherein, described filter capacitor C1 and described filter capacitor C2 adopts low equivalent resistance electric capacity.
Wherein, described switching power circuit also comprises:
Resistance R1 and resistance R3;
One end of described resistance R1 is connected with described rectification filtering module, and the other end of described resistance R1 is connected with one end of described resistance R3, and the other end of described resistance R3 is connected with described switch control module.
Wherein, described switch control module comprises:
Switching power source chip, diode D3, electric capacity C6, electric capacity C7, resistance R6, resistance R7;
The anode of described diode D3 is connected with described high frequency transformer, the negative electrode of described diode D3 is connected with the supply pin of described switching power source chip, built-in metal-oxide-semiconductor drain electrode and the described absorbing circuit model calling of described switching power source chip, one end of described electric capacity C6 is connected with the negative electrode of described diode D3, the other end ground connection of described electric capacity C6, one end of described resistance R6 is connected with the anode of described diode D3, the other end of described resistance R6 is connected with one end of described resistance R7, described electric capacity C7 and described resistance R7 is connected in parallel, described one end of resistance R7 is connected with the feedback pin of switching power source chip, the other end ground connection of described resistance R7.
Wherein, described high frequency transformer armature winding ground connection.
Wherein, described output rectification filter module comprises:
Electric capacity C3, electric capacity C4, electric capacity C8, electric capacity C9, resistance R5, rectifier diode D4 and voltage stabilizing didoe D5;
The anode of described rectifier diode D4 is connected with described high frequency transformer secondary winding, described resistance R5 is connected in parallel with described rectifier diode D4 after connecting with described electric capacity C8 again, the negative electrode of described rectifier diode D4 is connected with the negative electrode of the anode of described electric capacity C3, the anode of described electric capacity C4 and described voltage stabilizing didoe D5 respectively, described electric capacity C3, electric capacity C4, electric capacity C9 and described voltage stabilizing didoe are connected in parallel, the minus earth of described electric capacity C3.
Wherein, described circuit adopts one point earth, and earth terminal converges to the negative electrode of described electric capacity C2.
Correspondingly, the embodiment of the present invention additionally provides a kind of lighting device, comprises switching power circuit and luminous load, and the output of described switching power circuit is connected with described luminous load, wherein, described switching power circuit comprises the switching power circuit described in above-mentioned any one.
Correspondingly, the embodiment of the present invention additionally provides a kind of charger, comprises switching power circuit and charging load, and the output of described switching power circuit is connected with described charging load, wherein, described switching power circuit comprises the switching power circuit described in above-mentioned any one.
Implement the embodiment of the present invention, there is following beneficial effect:
Switching power circuit of the present invention is changed less relative to traditional switch power circuit, and structure is simple, and relative inexpensiveness, can reach and effectively suppress electromagnetic interference, the object of clean circuit.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of switching power circuit that the embodiment of the present invention provides;
Fig. 2 is the circuit diagram of a kind of switching power circuit that the embodiment of the present invention provides;
Fig. 3 is a kind of illuminator structure schematic diagram that the embodiment of the present invention provides;
Fig. 4 is a kind of charger construction schematic diagram that the embodiment of the present invention provides.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
Refer to Fig. 1, it is the structural representation of a kind of switching power circuit that the embodiment of the present invention provides, described switching power circuit 10 comprises rectification filtering module 100, absorbing circuit module 200, switch control module 300, high frequency transformer 400 and output rectification filter module 500, rectification filtering module 100 is connected with absorbing circuit module 200, absorbing circuit module 200 is connected with switch control module 300 and high frequency transformer 400 respectively, and high frequency transformer 400 is connected with switch control module 300 and output rectification filter module 500 respectively.
In embodiments of the present invention, direct for grid alternating current source rectification is first filtered into comparatively level and smooth direct current by rectification filtering module 100, uses for next stage.Be high-frequency alternating current by absorbing circuit module 200, switch control rule film 300 and high frequency transformer 400 by the DC inverter after rectification, finally according to load needs, provide reliable and stable DC power supply through output rectification filter module 500.
Switching power circuit provided by the present invention is changed less relative to traditional switch power circuit, and structure is simple, and cost is low, achieves the effective suppression to powered electromagnetic interference.
Refer to Fig. 2, it is the circuit diagram of a kind of switching power circuit that the embodiment of the present invention provides, described switching power circuit 10 comprises rectification filtering module 100, absorbing circuit module 200, high frequency transformer 400, switch control module 300 and output rectification filter module 500, rectification filtering module 100 is connected with absorbing circuit module 200, absorbing circuit module 200 is connected with switch control module 300 and high frequency transformer 400 respectively, and high frequency transformer 400 is connected with switch control module 300 and output rectification filter module 500 respectively.
Described absorbing circuit module 200 comprises resistance R2, resistance R4, electric capacity C5 and diode D2, wherein, resistance R2 and electric capacity C5 is connected in parallel, one end of resistance R2 is connected with high frequency transformer, the other end of resistance R2 is connected with one end of resistance R4, the other end of resistance R4 is connected with the negative electrode of diode D2, and the anode of diode D2 is connected with switch control module.
In ON-OFF control circuit breaker in middle pipe conducting moment, high frequency transformer armature winding produces very large shoving, and occurs higher surge peak voltage at the two ends of armature winding; Disconnect moment at switching tube, form the attenuated oscillation with spike, be superimposed upon on shutoff voltage, form shutoff voltage spike.Supply voltage interrupts also producing magnetizing inrush current transition the same when connecting with armature winding, this transition is a kind of conducted EMI, both primary was affected, conducted interference also can be made to return distribution system, cause mains by harmonics electromagnetic interference, thus affect safety and the economical operation of other equipment.
In the embodiment of the present invention, resistance R4 is added at traditional RCD absorbing circuit, and the model of diode D2 be preferably recovery time slower IN4007, the absorbing circuit improved can absorb the spike in metal-oxide-semiconductor switching process well, reduce the distortion of primary PWM waveform, effectively can suppress the conduction interference to circuit.
Further alternative, in embodiments of the present invention, described rectification filtering module 100 can comprise:
Rectifier bridge D1, inductance L 1, filter capacitor C1 and filter capacitor C2;
The output of rectifier bridge D1 is connected with filter capacitor C1, the input incoming transport power supply of rectifier bridge, and one end of inductance L 1 is connected with the anode of filter capacitor C1, and the other end of inductance L 1 is connected with the anode of filter capacitor C2, the minus earth of filter capacitor C2.
Described filter capacitor C1 and described filter capacitor C2 adopts low equivalent resistance electric capacity.
Rectification filtering module 100 is connected with power firestreak L, zero-power line N, and rectification filtering module 100 is for being more level and smooth direct voltage by the ac voltage rectifier of power module input, and described rectifier bridge D1 comprises the rectifier bridge of 4 rectifier diode compositions.Invent Shi Lizhong in this reality, this circuit working is at discontinuous conduct mode, and its input peak current is very large, and the filter effect of input stage is very large on EMC impact.When the increase of peak current can cause low pressure to input, output voltage reduces, and the temperature rise of electric capacity C2 also can increase; In order to improve output voltage and reduce the temperature rise of electric capacity C2, the capacity of electric capacity C1 need be improved and use low ESR(equivalent resistance) C1 and C2.Because after improving the capacity of C1, the operating voltage of C1 and C2 can rise, and when power output is constant, the peak current of input will reduce.The existence of L1, actually appears the capacity increasing C1 more effective than the capacity increasing C2 to suppressing EMC.
Further alternative, in embodiments of the present invention, described switching power circuit can also comprise:
Resistance R1 and resistance R3;
One end of described resistance R1 is connected with described rectification filtering module 100, and the other end of described resistance R1 is connected with one end of described resistance R3, and the other end of described resistance R3 is connected with described switch control module 300.
In embodiments of the present invention, add resistance R1 and R3, when can make zero load, circuit output voltage is unlikely to too low, avoids output voltage too low, and causes the band that may occur to carry the situation of just swinging machine.
Further alternative, in embodiments of the present invention, described switch control module 300 comprises:
Switching power source chip, diode D3, electric capacity C6, electric capacity C7, resistance R6, resistance R7;
The anode of diode D3 is connected with high frequency transformer 400, the built-in metal-oxide-semiconductor drain D rain of the negative electrode of diode D3 and the supply pin VDD switching power source chip of switching power source chip and absorbing circuit model calling, one end of electric capacity C6 is connected with the negative electrode of diode D3, the other end ground connection of electric capacity C6, one end of resistance R6 is connected with the anode of diode D3, the other end of resistance R6 is connected with one end of resistance R7, electric capacity C7 and resistance R7 is connected in parallel, one end of resistance R7 and the feedback pin FB of switching power source chip, the other end ground connection of described resistance R7.In embodiments of the present invention, switching power source chip can select OB2535, the product of the built-in metal-oxide-semiconductor such as CE5335.
Described high frequency transformer armature winding ground connection.
Further alternative, in embodiments of the present invention, described output rectification filter module 500 comprises:
Electric capacity C3, electric capacity C4, electric capacity C8, electric capacity C9, resistance R5, rectifier diode D4 and voltage stabilizing didoe D5;
The anode of rectifier diode D4 is connected with high frequency transformer secondary winding, resistance R5 is connected in parallel with rectifier diode D4 after connecting with electric capacity C8 again, the negative electrode of rectifier diode D4 is connected with the negative electrode of the anode of electric capacity C3, the anode of electric capacity C4 and voltage stabilizing didoe D5 respectively, electric capacity C3, electric capacity C4, electric capacity C9 and voltage stabilizing didoe D5 are connected in parallel, the minus earth of electric capacity C3.
Described circuit adopts one point earth, and earth terminal converges to the negative electrode of described electric capacity C2.
In embodiments of the present invention, the circulation formed because of earthed circuit is larger to interference effect, filter capacitor common port should be coupled to unique tie point of the AC deposition of big current as other earth point, adopt one point earth, all link on the grounding leg of filter capacitor C2 by the ground wire in mains switch current circuit, the ground wire of output rectifier current circuit is received on the grounding leg of corresponding filter capacitor C2 too, and such power work is more stable, not easily self-excitation.
In the embodiment of the present invention, in rectification filtering module 100, rectification is first carried out in grid alternating current source by rectifier bridge D1, and by the filter structure that filter capacitor C1 and C2 and inductance L 1 form, this AC power is filtered into comparatively level and smooth direct current.By giving switching power source chip breaker in middle pipe or controllable silicon, the conducting of Switching Power Supply and cut-off add that pulse signal has come, the positive half cycle of pulse signal arrives, switching tube or controllable silicon are with regard to conducting, and the voltage exported after rectifying and wave-filtering, with regard to conducting, passes to secondary by high frequency transformer; Oscillating impulse negative half period arrives, switching tube or controllable silicon cut-off, and power supply is turned off, and switch transformer is secondary does not have voltage, the operating voltage at this moment needed for each circuit, just maintains by the filter capacitor electric discharge after this road rectification secondary.In the moment of switching tube turn-on and turn-off, create a large amount of due to voltage spikes, the absorbing circuit module 200 of the improvement be made up of resistance R2, resistance R4, electric capacity C5 and diode D2 can absorb the spike in switching process well, reduce the distortion of primary PWM waveform, effectively inhibit the conduction interference to circuit.After DC inverter after rectifying and wave-filtering is high-frequency alternating current, according to load needs, the half-wave rectifying circuit be made up of rectifier diode D4, resistance R5 and electric capacity C8 in output rectification filter module 500, because diode D4 works in HF switch state, therefore the electromagnetic interference source of output rectification circuit mainly D4, resistance R5 and electric capacity C8 connects into the absorbing circuit of rectifier diode D4, the due to voltage spikes produced during for absorbing switch motion, and consume on resistance R5 in the form of heat.Then through electric capacity C3, C4, C9 and the reliable DC power supply of voltage stabilizing didoe D5 stable output.
Switching power circuit of the present invention is changed less relative to traditional switch power circuit, and structure is simple, and relative inexpensiveness, can reach and effectively suppress electromagnetic interference, the object of clean circuit.
Refer to Fig. 3, it is the structural representation of a kind of lighting device 1 that the embodiment of the present invention provides, described lighting device 1 comprises switching power circuit 10 and luminous load 20, the output of switching power circuit 10 is connected with luminous load 20, wherein, described switching power circuit comprises the switching power circuit described in above-described embodiment.This lighting device 1 comprises emergency light, mine lamp, LED product etc.
The embodiment of this lighting device 1 and the embodiment of switching power circuit are above based on same design, and its beneficial effect brought is also identical, and particular content please refer to the embodiment of switching power circuit, repeats no more herein.
Refer to Fig. 4, it is the structural representation of a kind of charger 2 that the embodiment of the present invention provides, described charger 2 comprises switching power circuit 10 and charging load 30, the output of switching power circuit 10 is connected with charging load 30, wherein, described switching power circuit comprises the switching power circuit described in above-described embodiment.
The embodiment of this charger 2 and the embodiment of switching power circuit are above based on same design, and its beneficial effect brought is also identical, and particular content please refer to the embodiment of switching power circuit, repeats no more herein.
Switching power circuit provided by the present invention is changed less relative to traditional switch power circuit, and structure is simple, relative inexpensiveness, achieves the effective suppression to powered electromagnetic interference.
Above disclosedly be only present pre-ferred embodiments, certainly can not limit the interest field of the present invention with this, therefore according to the equivalent variations that the claims in the present invention are done, still belong to the scope that the present invention is contained.
Claims (10)
1. a switching power circuit, it is characterized in that, comprise rectification filtering module, absorbing circuit module, high frequency transformer, switch control module and output rectification filter module, described rectification filtering module and described absorbing circuit model calling, described absorbing circuit module is connected with described switch control module and described high frequency transformer respectively, described high frequency transformer respectively with described switch control module and described output rectification filter model calling;
Described absorbing circuit module comprises resistance R2, resistance R4, electric capacity C5 and diode D2, wherein, described resistance R2 and described electric capacity C5 is connected in parallel, one end of described resistance R2 is connected with described high frequency transformer, the other end of described resistance R2 is connected with one end of described resistance R4, the other end of described resistance R4 is connected with the negative electrode of described diode D2, and the anode of described diode D2 is connected with described switch control module.
2. switching power circuit as claimed in claim 1, it is characterized in that, described rectification filtering module comprises:
Rectifier bridge D1, inductance L 1, filter capacitor C1 and filter capacitor C2;
The output of described rectifier bridge D1 is connected with described filter capacitor C1, the input incoming transport power supply of described rectifier bridge, one end of described inductance L 1 is connected with the anode of described filter capacitor C1, the other end of described inductance L 1 is connected with the anode of described filter capacitor C2, the minus earth of described filter capacitor C2.
3. switching power circuit as claimed in claim 2, it is characterized in that, described filter capacitor C1 and described filter capacitor C2 adopts low equivalent resistance electric capacity.
4. switching power circuit as claimed in claim 2, is characterized in that, also comprise:
Resistance R1 and resistance R3;
One end of described resistance R1 is connected with described rectification filtering module, and the other end of described resistance R1 is connected with one end of described resistance R3, and the other end of described resistance R3 is connected with described switch control module.
5. switching power circuit as claimed in claim 4, it is characterized in that, described switch control module comprises:
Switching power source chip, diode D3, electric capacity C6, electric capacity C7, resistance R6, resistance R7;
The anode of described diode D3 is connected with described high frequency transformer, the negative electrode of described diode D3 is connected with the supply pin of described switching power source chip, built-in metal-oxide-semiconductor drain electrode and the described absorbing circuit model calling of described switching power source chip, one end of described electric capacity C6 is connected with the negative electrode of described diode D3, the other end ground connection of described electric capacity C6, one end of described resistance R6 is connected with the anode of described diode D3, the other end of described resistance R6 is connected with one end of described resistance R7, described electric capacity C7 and described resistance R7 is connected in parallel, one end of described resistance R7 is connected with the feedback pin of described switching power source chip, the other end ground connection of described resistance R7.
6. switching power circuit as claimed in claim 5, is characterized in that, described high frequency transformer armature winding ground connection.
7. switching power circuit as claimed in claim 6, it is characterized in that, described output rectification filter module comprises:
Electric capacity C3, electric capacity C4, electric capacity C8, electric capacity C9, resistance R5, rectifier diode D4 and voltage stabilizing didoe D5;
The anode of described rectifier diode D4 is connected with described high frequency transformer secondary winding, described resistance R5 is connected in parallel with described rectifier diode D4 after connecting with described electric capacity C8 again, the negative electrode of described rectifier diode D4 is connected with the negative electrode of the anode of described electric capacity C3, the anode of described electric capacity C4 and described voltage stabilizing didoe D5 respectively, described electric capacity C3, electric capacity C4, electric capacity C9 and described voltage stabilizing didoe D5 are connected in parallel, the minus earth of described electric capacity C3.
8. switching power circuit as claimed in claim 7, is characterized in that, described circuit adopts one point earth, and earth terminal converges to the negative electrode of described electric capacity C2.
9. a lighting device, is characterized in that, comprises switching power circuit and luminous load, and the output of described switching power circuit is connected with described luminous load, and wherein, described switching power circuit is the switching power circuit described in any one of claim 1 to 8.
10. a charger, is characterized in that, comprises switching power circuit and charging load, and the output of described switching power circuit is connected with described charging load, and wherein said switching power circuit is the switching power circuit described in any one of claim 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310378687.8A CN104426353A (en) | 2013-08-27 | 2013-08-27 | Switching power circuit, lighting device, and charger |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310378687.8A CN104426353A (en) | 2013-08-27 | 2013-08-27 | Switching power circuit, lighting device, and charger |
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| CN104426353A true CN104426353A (en) | 2015-03-18 |
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| CN201310378687.8A Pending CN104426353A (en) | 2013-08-27 | 2013-08-27 | Switching power circuit, lighting device, and charger |
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Cited By (4)
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| CN106899198A (en) * | 2017-03-30 | 2017-06-27 | 北京精密机电控制设备研究所 | A kind of feedback winding multiplex circuit of high frequency transformer |
| CN108024420A (en) * | 2018-01-08 | 2018-05-11 | 江西美的贵雅照明有限公司 | LED low-voltage driving circuits and LED lamp |
| CN109462920A (en) * | 2017-09-06 | 2019-03-12 | 深圳市海洋王照明工程有限公司 | A kind of lighting apparatus and its control circuit |
| CN113676066A (en) * | 2021-08-31 | 2021-11-19 | 深圳市雅晶源科技有限公司 | EMI shielding system of gallium nitride quick charging source |
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| CN201550033U (en) * | 2009-10-30 | 2010-08-11 | 深圳市福瑞康电子有限公司 | Switch power supply based on PWM control and charger provided with same |
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| CN106899198A (en) * | 2017-03-30 | 2017-06-27 | 北京精密机电控制设备研究所 | A kind of feedback winding multiplex circuit of high frequency transformer |
| CN106899198B (en) * | 2017-03-30 | 2019-04-09 | 北京精密机电控制设备研究所 | A kind of feedback winding multiplex circuit of high frequency transformer |
| CN109462920A (en) * | 2017-09-06 | 2019-03-12 | 深圳市海洋王照明工程有限公司 | A kind of lighting apparatus and its control circuit |
| CN109462920B (en) * | 2017-09-06 | 2021-07-06 | 深圳市海洋王照明工程有限公司 | Lighting device and control circuit thereof |
| CN108024420A (en) * | 2018-01-08 | 2018-05-11 | 江西美的贵雅照明有限公司 | LED low-voltage driving circuits and LED lamp |
| CN108024420B (en) * | 2018-01-08 | 2023-07-28 | 美智光电科技股份有限公司 | LED low-voltage driving circuit and LED lamp |
| CN113676066A (en) * | 2021-08-31 | 2021-11-19 | 深圳市雅晶源科技有限公司 | EMI shielding system of gallium nitride quick charging source |
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Application publication date: 20150318 |