CN203416169U - Flyback power supply circuit - Google Patents
Flyback power supply circuit Download PDFInfo
- Publication number
- CN203416169U CN203416169U CN201320481034.8U CN201320481034U CN203416169U CN 203416169 U CN203416169 U CN 203416169U CN 201320481034 U CN201320481034 U CN 201320481034U CN 203416169 U CN203416169 U CN 203416169U
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- power supply
- secondary winding
- termination
- flyback
- rectifier diode
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Abstract
The utility model discloses a flyback power supply circuit which comprises a transformer, a primary circuit and a secondary circuit, wherein the secondary circuit is coupled with the primary circuit via the transformer. The secondary circuit comprises a main power supply circuit and an auxiliary power supply circuit, wherein the auxiliary power supply circuit comprises a second secondary winding, a first diode, an energy storing capacitor, a second diode, a second capacitor and a third capacitor; the flyback output end of the second secondary winding is connected with the anode of the first diode, and the cathode of the first diode is connected with the positive output end of the auxiliary power supply circuit; one end of the energy storing capacitor is connected with the cathode of the first diode, and the other end of the energy storing capacitor is grounded; the positive end of the third capacitor is connected with the cathode of the first diode, and the negative end of the third capacitor is connected with the other end of the second secondary winding; the positive end of the second capacitor is connected with the other end of the second secondary winding, and the negative end of the second capacitor is grounded; and the anode of the second diode is connected with the negative end of the second capacitor, and the cathode of the second diode is connected with the anode of a first rectification diode. According to the utility model, voltage of the auxiliary power supply circuit is stable, the circuit structure is simple, and the cost is relatively low.
Description
[technical field]
The utility model relates to equipment power supply circuits, relates in particular to a kind of flyback power supply circuits.
[background technology]
Tradition inverse-excitation converting power supply circuits as shown in Figure 1, comprise transformer, former limit circuit and secondary circuit, and secondary circuit is by transformer and former limit which couple.Secondary circuit comprises main power supply circuits and auxiliary power supply circuit, and main power supply circuits are powered to equipment, and auxiliary power supply circuit is to the components and parts power supply on former and deputy limit.Former limit circuit comprises former limit winding, switching tube, RCD absorption circuit and the switch tube driving circuit of DC supply input, transformer, the first termination DC supply input of transformer primary side winding Np, and the second end is by switching tube Q1 ground connection.Main power supply circuits comprise the first secondary winding Ns, the 3rd rectifier diode D3 and the filter capacitor EC5 of transformer, the anode of a termination the 3rd rectifier diode that the first secondary winding and former limit winding the second end are of the same name, the negative electrode of the 3rd rectifier diode meets the cathode output end Vo of main power supply circuits, the other end ground connection of the first secondary winding.Auxiliary power supply circuit comprises the second secondary winding Nvcc_2, the first rectifier diode D1, storage capacitor EC1, filter capacitor EC4 and the linear voltage-stabilizing circuit of transformer, one end that the second secondary winding and former limit winding the second end are of the same name connects the anode of the first rectifier diode by resistance R 1, the negative electrode of the first rectifier diode meets the cathode output end Vcc2 of auxiliary power supply circuit by the triode Q2 of linear voltage-stabilizing circuit; The other end ground connection of the second secondary winding.Storage capacitor EC1 is connected between the negative electrode and ground of the first rectifier diode.The second secondary winding Nvec_2, resistance R 1, the first rectifier diode D1 and storage capacitor EC1 form flyback output circuit.
Shown in Fig. 1, the shortcoming of traditional inverse-excitation converting power supply circuits is, in the less situation of the change in voltage scope of the cathode output end Vo of main power supply circuits, auxiliary power supply circuit is also to meet the power supply needs of the components and parts on former and deputy limit; But in the larger situation of the change in voltage scope of the cathode output end Vo of main power supply circuits; particularly in the situation of main power supply circuits low pressure output or even output short-circuit; from flyback transformer turn ratio relation, there will be auxiliary power supply circuit to cause interlock circuit to occur the fault that protection is turn-offed to the components and parts electricity shortage on former and deputy limit.
[summary of the invention]
The technical problems to be solved in the utility model is to provide the stable flyback power supply circuits of a kind of auxiliary power supply circuit voltage.
In order to solve the problems of the technologies described above, the technical solution adopted in the utility model is, a kind of flyback power supply circuits, comprise transformer, former limit circuit and secondary circuit, secondary circuit is by transformer and former limit which couple, secondary circuit comprises main power supply circuits and auxiliary power supply circuit, main power supply circuits comprise the first secondary winding of transformer, and auxiliary power supply circuit comprises the second secondary winding, the first rectifier diode, storage capacitor, the second rectifier diode, the second electric capacity and the 3rd electric capacity of transformer; The first secondary winding and the output of the second secondary winding flyback; The anode of flyback output termination first rectifier diode of the second secondary winding, the negative electrode of the first rectifier diode connects the cathode output end of auxiliary power supply circuit; The negative electrode of one termination the first rectifier diode of storage capacitor, other end ground connection; The negative electrode of anodal termination first rectifier diode of the 3rd electric capacity, the other end of negative pole termination the second secondary winding; The other end of the anodal termination second secondary winding of the second electric capacity, negative pole end ground connection; The anode of the second rectifier diode connects the negative pole end of the second electric capacity, and negative electrode connects the anode of the first rectifier diode.
Above-described flyback power supply circuits, auxiliary power supply circuit comprises current-limiting resistance, the flyback output of the second secondary winding connects the anode of the first rectifier diode by current-limiting resistance.
Above-described flyback power supply circuits, auxiliary power supply circuit comprises linear voltage-stabilizing circuit, linear voltage-stabilizing circuit comprises triode, voltage-stabiliser tube and the 3rd resistance; The collector electrode of triode connects the negative electrode of the first rectifier diode, and emitter connects the cathode output end of auxiliary power supply circuit, and base stage connects the negative electrode of voltage-stabiliser tube; The plus earth of voltage-stabiliser tube, the collector electrode of a termination triode of the 3rd resistance, the base stage of another termination triode.
Above-described flyback power supply circuits, auxiliary power supply circuit comprises the 4th filter capacitor, the cathode output end of the anodal termination auxiliary power supply circuit of the 4th filter capacitor, negative pole end ground connection.
Above-described flyback power supply circuits, main power supply circuits comprise the 3rd rectifier diode and the 5th filter capacitor, the anode of flyback output termination the 3rd rectifier diode of the first secondary winding, the negative electrode of the 3rd rectifier diode connects the cathode output end of main power supply circuits; The other end ground connection of the first secondary winding; The cathode output end of the main power supply circuits of anodal termination of the 5th filter capacitor, negative pole end ground connection.
Above-described flyback power supply circuits, former limit circuit comprises the former limit winding of transformer, switching tube and RCD absorption circuit, RCD absorption circuit comprises the 4th diode, the first electric capacity and the 5th resistance, after the first electric capacity and the 5th resistance parallel connection, one termination DC power anode input, the negative electrode of another termination the 4th diode; The first termination DC power anode input of former limit winding, the second end is by switching tube ground connection; The anode of the 4th diode connects the second end of former limit winding; The flyback output of the first secondary winding and the second secondary winding is the Same Name of Ends of former limit winding the second end.
Above-described flyback power supply circuits, former limit circuit comprises the 6th filter capacitor, the anodal termination DC power anode input of the 6th filter capacitor, negative pole end ground connection.
The utility model flyback power supply circuits auxiliary power supply circuit voltage is stable, and circuit structure is simple, and cost is lower.
[accompanying drawing explanation]
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail.
Fig. 1 is the schematic diagram of prior art flyback power supply circuits.
Fig. 2 is the schematic diagram of the utility model embodiment flyback power supply circuits.
[embodiment]
The structure of the utility model embodiment flyback power supply circuits and principle as shown in Figure 2, comprise transformer, former limit circuit and secondary circuit, and secondary circuit is by transformer and former limit which couple.
Former limit circuit comprises the former limit winding Np of transformer, metal-oxide-semiconductor Q1 and RCD absorption circuit, RCD absorption circuit comprises diode D4, capacitor C 1 and resistance R 5, after capacitor C 1 and resistance R 5 parallel connections, one termination DC power anode input Vin_DC, the negative electrode of another terminating diode D4.The first termination DC power anode input Vin_DC of former limit winding Np, the second end is by metal-oxide-semiconductor Q1 and resistance R 2 ground connection.The anode of diode D4 connects the second end of former limit winding Np.The anodal termination DC power anode of filter capacitor EC6 input Vin_DC, negative pole end ground connection.
Secondary circuit comprises main power supply circuits and auxiliary power supply circuit.
Main power supply circuits comprise the first secondary winding Ns, rectifier diode D3 and filter capacitor EC5 of transformer.The anode of the flyback output termination rectifier diode D3 of the first secondary winding Ns, the negative electrode of rectifier diode D3 meets the cathode output end Vo of main power supply circuits.The other end ground connection of the first secondary winding Ns.The cathode output end Vo of the main power supply circuits of anodal termination of filter capacitor EC5, negative pole end ground connection.The flyback output of the first secondary winding Ns is the Same Name of Ends of former limit winding Np the second end.
Auxiliary power supply circuit comprises the second secondary winding Nvcc_2, rectifier diode D1, storage capacitor EC1, rectifier diode D2, electric capacity EC2, electric capacity EC3 and the linear voltage-stabilizing circuit of transformer.Linear voltage-stabilizing circuit comprises triode Q2, voltage-stabiliser tube U1 and resistance R 3.
The flyback output of the second secondary winding Nvcc_2 connects the anode of rectifier diode D1 by current-limiting resistance R1. and the negative electrode of rectifier diode D1 connects the collector electrode of triode Q2, and the emitter of triode Q2 meets the cathode output end Vcc2 of auxiliary power supply circuit.
The negative electrode of a termination rectifier diode D1 of storage capacitor EC1, other end ground connection.The negative electrode of the anodal termination rectifier diode D1 of electric capacity EC3, the other end of negative pole termination the second secondary winding Nvcc_2.The other end of anodal termination the second secondary winding Nvcc_2 of electric capacity EC2, negative pole end ground connection.The anode of rectifier diode D2 connects the negative pole end of electric capacity EC2, and negative electrode connects the anode of rectifier diode D1.
The flyback output of the second secondary winding Nvcc_2 is the Same Name of Ends of former limit winding Np the second end, and the other end is the normal shock output of the second secondary winding Nvcc_2.
The base stage of triode Q2 connects the negative electrode of voltage-stabiliser tube U1.The plus earth of voltage-stabiliser tube U1, the collector electrode of a termination triode Q2 of resistance R 3, the base stage of another termination triode Q2.
The cathode output end Vcc2 of the anodal termination auxiliary power supply circuit of filter capacitor EC4, negative pole end ground connection.
During the second secondary winding Nvcc_2 flyback output, diode D1 conducting is to electric capacity EC1 charging, and during the second secondary winding Nvcc_2 normal shock output, electric capacity EC2 charges, diode D2 conducting, and last, the voltage above electric capacity EC3 is the superimposed voltage of positive flyback process.
When former limit DC power anode input Vin_DC is definite value, when the change in voltage of the cathode output end Vo of main power supply circuits is little, the voltage of auxiliary power supply circuit capacitance EC1 is the voltage that positive flyback overlap power supply forms; When the change in voltage of the cathode output end Vo of main power supply circuits very large, (output voltage is very low, or even output short-circuit) time, auxiliary power supply circuit mainly be take normal shock power supply as main, now normal shock voltage is: Vin_DC * (n2/n0), wherein, n2 is the number of turn of the second secondary winding Nvcc_2, and n0 is the number of turn of former limit winding Np.If the Voltage-output of the cathode output end Vo of main power supply circuits is not 0, the voltage on electric capacity EC3 is the magnitude of voltage of normal shock voltage while adding flyback.Voltage during the second secondary winding Nvcc_2 flyback output: (Vo+Vf) * (n2/n1), wherein, n1 is the number of turn of the first secondary winding Ns, and n2 is the number of turn of the second secondary winding Nvcc_2, and Vo is main supply power voltage, and Vf is diode drop.
If there is no diode D2, electric capacity EC1, EC2, when the altering a great deal of Vo (output voltage very low or even output short-circuit), by the known Nvcc_2 winding of anti exciting converter principle no-voltage almost, cannot guarantee that auxiliary power supply circuit Vcc2 has enough voltage to supply with relevant control circuit.
Known by above operation principle, the circuit of the above embodiment of the utility model can solve the problem of the change in voltage that the traditional VCC of flyback power supply cannot accomplish main power supply circuits Vo very large (output voltage very low or even output short-circuit), if the modes such as additional accessory power supply face the problems such as cost is higher, complex circuit designs.So, the utility model circuit by appropriate design, apply in a flexible way, can obtain relatively good effect, solve the above-mentioned problem, reach object cost-saving, simplified design.
Claims (7)
1. flyback power supply circuits, comprise transformer, former limit circuit and secondary circuit, secondary circuit is by transformer and former limit which couple, secondary circuit comprises main power supply circuits and auxiliary power supply circuit, main power supply circuits comprise the first secondary winding of transformer, auxiliary power supply circuit comprises the second secondary winding, the first rectifier diode and the storage capacitor of transformer, the first secondary winding and the output of the second secondary winding flyback; The anode of flyback output termination first rectifier diode of the second secondary winding, the negative electrode of the first rectifier diode connects the cathode output end of auxiliary power supply circuit; The negative electrode of one termination the first rectifier diode of storage capacitor, other end ground connection; It is characterized in that, auxiliary power supply circuit comprises the second rectifier diode, the second electric capacity and the 3rd electric capacity, the negative electrode of anodal termination first rectifier diode of the 3rd electric capacity, the other end of negative pole termination the second secondary winding; The other end of the anodal termination second secondary winding of the second electric capacity, negative pole end ground connection; The anode of the second rectifier diode connects the negative pole end of the second electric capacity, and negative electrode connects the anode of the first rectifier diode.
2. flyback power supply circuits according to claim 1, is characterized in that, auxiliary power supply circuit comprises current-limiting resistance, and the flyback output of the second secondary winding connects the anode of the first rectifier diode by current-limiting resistance.
3. flyback power supply circuits according to claim 1, is characterized in that, auxiliary power supply circuit comprises linear voltage-stabilizing circuit, and linear voltage-stabilizing circuit comprises triode, voltage-stabiliser tube and the 3rd resistance; The collector electrode of triode connects the negative electrode of the first rectifier diode, and emitter connects the cathode output end of auxiliary power supply circuit, and base stage connects the negative electrode of voltage-stabiliser tube; The plus earth of voltage-stabiliser tube, the collector electrode of a termination triode of the 3rd resistance, the base stage of another termination triode.
4. flyback power supply circuits according to claim 1, is characterized in that, auxiliary power supply circuit comprises the 4th filter capacitor, the cathode output end of the anodal termination auxiliary power supply circuit of the 4th filter capacitor, negative pole end ground connection.
5. flyback power supply circuits according to claim 1, it is characterized in that, main power supply circuits comprise the 3rd rectifier diode and the 5th filter capacitor, the anode of flyback output termination the 3rd rectifier diode of the first secondary winding, the negative electrode of the 3rd rectifier diode connects the cathode output end of main power supply circuits; The other end ground connection of the first secondary winding; The cathode output end of the main power supply circuits of anodal termination of the 5th filter capacitor, negative pole end ground connection.
6. flyback power supply circuits according to claim 1, it is characterized in that, former limit circuit comprises the former limit winding of transformer, switching tube and RCD absorption circuit, RCD absorption circuit comprises the 4th diode, the first electric capacity and the 5th resistance, after the first electric capacity and the 5th resistance parallel connection, a termination DC power anode input, the negative electrode of another termination the 4th diode; The first termination DC power anode input of former limit winding, the second end is by switching tube ground connection; The anode of the 4th diode connects the second end of former limit winding; The flyback output of the first secondary winding and the second secondary winding is the Same Name of Ends of former limit winding the second end.
7. flyback power supply circuits according to claim 6, is characterized in that, former limit circuit comprises the 6th filter capacitor, the anodal termination DC power anode input of the 6th filter capacitor, negative pole end ground connection.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320481034.8U CN203416169U (en) | 2013-08-07 | 2013-08-07 | Flyback power supply circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320481034.8U CN203416169U (en) | 2013-08-07 | 2013-08-07 | Flyback power supply circuit |
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| CN203416169U true CN203416169U (en) | 2014-01-29 |
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| CN201320481034.8U Expired - Fee Related CN203416169U (en) | 2013-08-07 | 2013-08-07 | Flyback power supply circuit |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106059307A (en) * | 2015-04-10 | 2016-10-26 | Pr电子股份公司 | Universal input voltage dc-dc converter employing low voltage capacitor power bank |
| CN106208747A (en) * | 2016-08-31 | 2016-12-07 | 杭州乾龙电器有限公司 | Isolated form authigenic power supply circuit |
| CN110266195A (en) * | 2019-07-23 | 2019-09-20 | 上海麟荣电子技术有限公司 | A kind of circuit of reversed excitation |
| CN110608493A (en) * | 2019-09-27 | 2019-12-24 | 东莞网田机电工程有限公司 | Hotel air conditioner host control system |
| CN113179026A (en) * | 2021-05-17 | 2021-07-27 | 上海南芯半导体科技有限公司 | Flyback power supply circuit and control method thereof |
| CN113589005A (en) * | 2021-07-27 | 2021-11-02 | 捷蒽迪电子科技(上海)有限公司 | Voltage detection circuit with blanking time |
| WO2022161066A1 (en) * | 2021-01-26 | 2022-08-04 | 合肥美的电冰箱有限公司 | Xenon lamp power supply, purification device and refrigeration device |
-
2013
- 2013-08-07 CN CN201320481034.8U patent/CN203416169U/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106059307A (en) * | 2015-04-10 | 2016-10-26 | Pr电子股份公司 | Universal input voltage dc-dc converter employing low voltage capacitor power bank |
| EP3079252A3 (en) * | 2015-04-10 | 2016-12-14 | PR Electronics A/S | Universal input voltage dc-dc converter employing low voltage capacitor power bank |
| CN106208747A (en) * | 2016-08-31 | 2016-12-07 | 杭州乾龙电器有限公司 | Isolated form authigenic power supply circuit |
| CN110266195A (en) * | 2019-07-23 | 2019-09-20 | 上海麟荣电子技术有限公司 | A kind of circuit of reversed excitation |
| CN110608493A (en) * | 2019-09-27 | 2019-12-24 | 东莞网田机电工程有限公司 | Hotel air conditioner host control system |
| WO2022161066A1 (en) * | 2021-01-26 | 2022-08-04 | 合肥美的电冰箱有限公司 | Xenon lamp power supply, purification device and refrigeration device |
| CN113179026A (en) * | 2021-05-17 | 2021-07-27 | 上海南芯半导体科技有限公司 | Flyback power supply circuit and control method thereof |
| CN113589005A (en) * | 2021-07-27 | 2021-11-02 | 捷蒽迪电子科技(上海)有限公司 | Voltage detection circuit with blanking time |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160526 Address after: 412000 No. 1728, Taishan Road, Tianyuan District, Hunan, Zhuzhou Patentee after: ZHUZHOU MEGMEET ELECTRIC CO.,LTD. Address before: 518000 Shenzhen science and technology zone, Nanshan District Province, North District, road, No. 13, Thunis science and Technology Park, layer 5 Patentee before: SHENZHEN MEGMEET ELECTRICAL Co.,Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140129 |