CN205017224U - Power circuit of PFC flyback LED power supply for converting alternating current into direct current - Google Patents
Power circuit of PFC flyback LED power supply for converting alternating current into direct current Download PDFInfo
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- CN205017224U CN205017224U CN201520726655.7U CN201520726655U CN205017224U CN 205017224 U CN205017224 U CN 205017224U CN 201520726655 U CN201520726655 U CN 201520726655U CN 205017224 U CN205017224 U CN 205017224U
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- 238000001514 detection method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
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Abstract
The utility model provides a power supply circuit of PFC flyback LED power of interchange commentaries on classics direct current, includes AC input, rectification filter circuit and DC output, still includes high frequency transformer circuit and EMC circuit, rectification filter circuit is including inputing rectification filter circuit and exporting rectification filter circuit, and AC input is connected with EMC circuit, inputing rectification filter circuit, high frequency transformer circuit, exports rectification filter circuit and DC output electricity in proper order. The power circuit of the alternating current-to-direct current PFC flyback LED power supply also comprises an input overvoltage and undervoltage protection circuit and a PFC quasi-resonance control circuit, wherein the input rectification filter circuit is respectively and electrically connected with the input overvoltage and undervoltage protection circuit and the PFC quasi-resonance control circuit; the input overvoltage and undervoltage protection circuit is electrically connected with the PFC quasi-resonance control circuit. The PFC quasi-resonance control circuit is electrically connected with the high-frequency transformer circuit through the power switch circuit. The utility model has the characteristics of simple structure is reasonable, control is sensitive.
Description
Technical field
The utility model relates to the power circuit that the power circuit that a kind of instrument transformer does PFC flyback LED power, particularly a kind of interchange turn the PFC flyback LED power of direct current.
Background technology
Chinese patent literature CN104113223A discloses a kind of AC-DC change-over circuit on October 22nd, 2014, comprising: input module, for input ac voltage; Rectification module, is converted to direct voltage for the alternating voltage inputted by described input module; Voltage changing module, for carrying out transformation process to described direct voltage; Output module, for exporting the direct voltage after described transformation process; Voltage detection module, for detecting the direct voltage that described rectification module exports; And control module, for the testing result according to described voltage detection module, control described AC-DC change-over circuit and whether carry out work.
Utility model content
The purpose of this utility model aim to provide a kind of simple and reasonable, control the power circuit that sensitive interchange turns the PFC flyback LED power of direct current, to overcome weak point of the prior art.
A kind of interchange designed by this object turns the power circuit of the PFC flyback LED power of direct current, comprise AC input, current rectifying and wave filtering circuit and DC to export, its architectural feature also comprises high frequency transformer circuit and EMC circuit, described current rectifying and wave filtering circuit comprises input rectifying filter circuit and output rectifier and filter, and AC input exports with EMC circuit, input rectifying filter circuit, high frequency transformer circuit, output rectifier and filter and DC successively and is electrically connected.
Further, described interchange turns the power circuit of the PFC flyback LED power of direct current, also comprise input over-and under-voltage protective circuit and PFC quasi-resonance control circuit, input rectifying filter circuit is electrically connected with input over-and under-voltage protective circuit, PFC quasi-resonance control circuit respectively; Input over-and under-voltage protective circuit is electrically connected with PFC quasi-resonance control circuit.
Further, described interchange turns the power circuit of the PFC flyback LED power of direct current, and also comprise power switch circuit, PFC quasi-resonance control circuit is electrically connected with high frequency transformer circuit by power switch circuit.
Further; described interchange turns the power circuit of the PFC flyback LED power of direct current; also comprise sampling voltage, voltage stabilizing loop and short circuit overvoltage crowbar, DC is exported and is electrically connected with PFC quasi-resonance control circuit by sampling voltage, voltage stabilizing loop and short circuit overvoltage crowbar.
Further, described interchange turns the power circuit of the PFC flyback LED power of direct current, also comprise instrument transformer current limliting, overcurrent feedback and output power adjusting circuit, DC is exported and is electrically connected with PFC quasi-resonance control circuit by instrument transformer current limliting, overcurrent feedback and output power adjusting circuit.
Further, described interchange turns the power circuit of the PFC flyback LED power of direct current, also comprises Intelligent adjustment output power circuit, and this Intelligent adjustment output power circuit feeds back with instrument transformer current limliting, overcurrent and output power adjusting circuit connects.
Surge current foldback circuit is provided with between described input rectifying filter circuit and high frequency transformer circuit.
AC input in the utility model exports with EMC circuit, input rectifying filter circuit, high frequency transformer circuit, output rectifier and filter and DC successively and is electrically connected, the stability that the DC that can improve output exports and continuity.
Sampling voltage in the utility model, voltage stabilizing loop and short circuit overvoltage crowbar; DC is exported and is electrically connected with PFC quasi-resonance control circuit by sampling voltage, voltage stabilizing loop and short circuit overvoltage crowbar; can according to the sampling result of sampling voltage; real-time adjustment DC exports, to reach the object accurately controlled.
DC in the utility model is exported and is electrically connected with PFC quasi-resonance control circuit by instrument transformer current limliting, overcurrent feedback and output power adjusting circuit, can export to PFC quasi-resonance control circuit by Real-time Feedback DC, improve the control precision that DC exports.
The utility model has can control power output, the feature that efficiency is high, cost is low by instrument transformer feedback.
Accompanying drawing explanation
Fig. 1 is that the circuit of the utility model one embodiment connects block diagram.
Fig. 2 is circuit connection diagram of the present utility model.
In figure: 31 is input rectifying filter circuit; 32 is high frequency transformer circuit; 33 is output rectifier and filter, and 34 is EMC circuit, and 35 is input over-and under-voltage protective circuit; 36 is PFC quasi-resonance control circuit; 37 is power switch circuit, and 38 is sampling voltage, voltage stabilizing loop and short circuit overvoltage crowbar, and 39 is instrument transformer current limliting, overcurrent feedback and output power adjusting circuit; 40 is Intelligent adjustment output power circuit, and 41 is surge current foldback circuit.
Embodiment
Below in conjunction with drawings and Examples, the utility model is further described.
See Fig. 1-Fig. 2, this interchange turns the power circuit of the PFC flyback LED power of direct current, comprise AC input, current rectifying and wave filtering circuit and DC to export, also comprise high frequency transformer circuit 32 and EMC circuit 34, described current rectifying and wave filtering circuit comprises input rectifying filter circuit 31 and output rectifier and filter 33, AC input exports with EMC circuit 34, input rectifying filter circuit 31, high frequency transformer circuit 32, output rectifier and filter 33 and DC successively and is electrically connected.
In the present embodiment, described interchange turns the power circuit of the PFC flyback LED power of direct current, also comprise input over-and under-voltage protective circuit 35 and PFC quasi-resonance control circuit 36, input rectifying filter circuit 31 is electrically connected with input over-and under-voltage protective circuit 35, PFC quasi-resonance control circuit 36 respectively; Input over-and under-voltage protective circuit 35 is electrically connected with PFC quasi-resonance control circuit 36.
Described interchange turns the power circuit of the PFC flyback LED power of direct current, also comprises power switch circuit 37, PFC quasi-resonance control circuit 36 and is electrically connected with high frequency transformer circuit 32 by power switch circuit 37.
Described interchange turns the power circuit of the PFC flyback LED power of direct current; also comprise the output of sampling voltage, voltage stabilizing loop and short circuit overvoltage crowbar 38, DC to be electrically connected with PFC quasi-resonance control circuit 36 by sampling voltage, voltage stabilizing loop and short circuit overvoltage crowbar 38.
Described interchange turns the power circuit of the PFC flyback LED power of direct current, also comprise instrument transformer current limliting, overcurrent feedback and output power adjusting circuit 39, DC output to be electrically connected with PFC quasi-resonance control circuit 36 by instrument transformer current limliting, overcurrent feedback and output power adjusting circuit 39.
Described interchange turns the power circuit of the PFC flyback LED power of direct current, also comprises Intelligent adjustment output power circuit 40, and this Intelligent adjustment output power circuit 40 feeds back with instrument transformer current limliting, overcurrent and output power adjusting circuit 39 connects.
Surge current foldback circuit 41 is provided with between described input rectifying filter circuit 31 and high frequency transformer circuit 32.
More than show and describe general principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; what describe in above-described embodiment and specification just illustrates principle of the present utility model; under the prerequisite not departing from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall within the scope of claimed the utility model.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (7)
1. an interchange turns the power circuit of the PFC flyback LED power of direct current, comprise AC input, current rectifying and wave filtering circuit and DC to export, it is characterized in that also comprising high frequency transformer circuit (32) and EMC circuit (34), described current rectifying and wave filtering circuit comprises input rectifying filter circuit (31) and output rectifier and filter (33), and AC input exports with EMC circuit (34), input rectifying filter circuit (31), high frequency transformer circuit (32), output rectifier and filter (33) and DC successively and is electrically connected.
2. interchange according to claim 1 turns the power circuit of the PFC flyback LED power of direct current, it is characterized in that also comprising input over-and under-voltage protective circuit (35) and PFC quasi-resonance control circuit (36), input rectifying filter circuit (31) is electrically connected with input over-and under-voltage protective circuit (35), PFC quasi-resonance control circuit (36) respectively; Input over-and under-voltage protective circuit (35) is electrically connected with PFC quasi-resonance control circuit (36).
3. interchange according to claim 2 turns the power circuit of the PFC flyback LED power of direct current, it is characterized in that also comprising power switch circuit (37), PFC quasi-resonance control circuit (36) is electrically connected with high frequency transformer circuit (32) by power switch circuit (37).
4. interchange according to claim 2 turns the power circuit of the PFC flyback LED power of direct current; it is characterized in that also comprising sampling voltage, voltage stabilizing loop and short circuit overvoltage crowbar (38), DC is exported and is electrically connected with PFC quasi-resonance control circuit (36) by sampling voltage, voltage stabilizing loop and short circuit overvoltage crowbar (38).
5. the interchange according to claim 3 or 4 turns the power circuit of the PFC flyback LED power of direct current, it is characterized in that also comprising instrument transformer current limliting, overcurrent feedback and output power adjusting circuit (39), DC is exported and is electrically connected with PFC quasi-resonance control circuit (36) by instrument transformer current limliting, overcurrent feedback and output power adjusting circuit (39).
6. interchange according to claim 5 turns the power circuit of the PFC flyback LED power of direct current, it is characterized in that also comprising Intelligent adjustment output power circuit (40), this Intelligent adjustment output power circuit (40) with instrument transformer current limliting, overcurrent feeds back and output power adjusting circuit (39) connects.
7. interchange according to claim 1 turns the power circuit of the PFC flyback LED power of direct current, it is characterized in that being provided with surge current foldback circuit (41) between described input rectifying filter circuit (31) and high frequency transformer circuit (32).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520726655.7U CN205017224U (en) | 2015-09-18 | 2015-09-18 | Power circuit of PFC flyback LED power supply for converting alternating current into direct current |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520726655.7U CN205017224U (en) | 2015-09-18 | 2015-09-18 | Power circuit of PFC flyback LED power supply for converting alternating current into direct current |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205017224U true CN205017224U (en) | 2016-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520726655.7U Active CN205017224U (en) | 2015-09-18 | 2015-09-18 | Power circuit of PFC flyback LED power supply for converting alternating current into direct current |
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| Country | Link |
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| CN (1) | CN205017224U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107465352A (en) * | 2017-09-11 | 2017-12-12 | 沈阳铁路信号有限责任公司 | Five tunnels export microcomputer monitoring Switching Power Supply |
| CN108649670A (en) * | 2018-04-11 | 2018-10-12 | 湖北三江航天万峰科技发展有限公司 | A kind of shelter accumulator group electric power controller |
| CN112928806A (en) * | 2021-01-28 | 2021-06-08 | 湖南炬神电子有限公司 | Subminiature power supply implementation method |
-
2015
- 2015-09-18 CN CN201520726655.7U patent/CN205017224U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107465352A (en) * | 2017-09-11 | 2017-12-12 | 沈阳铁路信号有限责任公司 | Five tunnels export microcomputer monitoring Switching Power Supply |
| CN108649670A (en) * | 2018-04-11 | 2018-10-12 | 湖北三江航天万峰科技发展有限公司 | A kind of shelter accumulator group electric power controller |
| CN112928806A (en) * | 2021-01-28 | 2021-06-08 | 湖南炬神电子有限公司 | Subminiature power supply implementation method |
| CN112928806B (en) * | 2021-01-28 | 2022-09-13 | 湖南炬神电子有限公司 | Subminiature power supply implementation method |
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