CN204442190U - A kind of doubleway output step-down controller circuit - Google Patents
A kind of doubleway output step-down controller circuit Download PDFInfo
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- CN204442190U CN204442190U CN201520152554.3U CN201520152554U CN204442190U CN 204442190 U CN204442190 U CN 204442190U CN 201520152554 U CN201520152554 U CN 201520152554U CN 204442190 U CN204442190 U CN 204442190U
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Abstract
The utility model discloses a kind of doubleway output step-down controller circuit, comprise chip U1, diode D1, fuse FU, inductance L 1, electric capacity C1 and triode Q1.The utility model doubleway output step-down controller circuit adopts buck topology structure technology, realizes two output voltages and without the need to transformer, circuit structure is simple, reduce the volume of step-down controller greatly, cost is low, and output voltage stabilization, be applicable to very much promoting the use of.
Description
Technical field
The utility model relates to a kind of converter circuit, specifically a kind of doubleway output step-down controller circuit.
Background technology
Along with the development of power electronic technology, the work of power electronic equipment and people, the relation of life are day by day close, and electronic equipment all be unable to do without reliably power supply.Step-down controller utilizes modern power electronics technology, the time ratio of control switch transistor ON and shutoff, and maintain a kind of power supply of regulated output voltage, step-down controller is generally made up of pulse width modulation control IC box Mos pipe.Step-down controller high frequency is the direction of its development, and high frequency makes step-down controller enter application widely, particularly in the application of high-technology field, has promoted the miniaturization of new high-tech product, lighting.How guarantee is stable export while, reduce step-down controller volume, alleviate its weight, become the direction of research in industry.
Utility model content
The purpose of this utility model is to provide that a kind of volume is little, the doubleway output step-down controller circuit of stable output, to solve the problem proposed in above-mentioned background technology.
For achieving the above object, the utility model provides following technical scheme:
A kind of doubleway output step-down controller circuit, comprises chip U1, diode D1, fuse FU, inductance L 1, electric capacity C1 and triode Q1, described fuse FU one end connects 220V alternating current, the fuse FU other end connects diode D1 positive pole, diode D1 negative pole connects inductance L 1 and electric capacity C1 respectively, inductance L 1 other end connects electric capacity C2 and chip U1 pin D respectively, chip U1 pin FB respectively contact resistance R1 and resistance R2, chip U1 pin BP connects electric capacity C3, and chip U1 pin S connects the electric capacity C3 other end respectively, the resistance R1 other end, diode D2 negative pole, electric capacity C4, inductance L 2 and resistance R3, the electric capacity C4 other end is the contact resistance R2 other end and diode D3 negative pole respectively, and diode D3 positive pole connects inductance L 2 other end respectively, electric capacity C5, resistance R4, resistance R7, resistance R6 and output V1, the resistance R6 other end is contact resistance R5 respectively, diode D4 positive pole, the electric capacity C5 other end, the resistance R3 other end, diode D2 positive pole, the electric capacity C2 other end, the electric capacity C1 other end and the 220V alternating current other end ground connection, diode D4 negative pole contact resistance R8, the resistance R8 other end is the contact resistance R7 other end and triode Q1 base stage respectively, the triode Q1 collector electrode contact resistance R4 other end, triode Q1 emitter is the contact resistance R5 other end and output V2 respectively.
As further program of the utility model: described chip U1 model is LNK304DN.
As further program of the utility model: described output V1 voltage is 12V.
As the utility model further scheme: described output V2 voltage is 3.3V.
Compared with prior art, the beneficial effects of the utility model are: the utility model doubleway output step-down controller circuit adopts buck topology structure technology, realize two output voltages and without the need to transformer, circuit structure is simple, reduce the volume of step-down controller greatly, cost is low, and output voltage stabilization, be applicable to very much promoting the use of.
Accompanying drawing explanation
Fig. 1 is the circuit diagram of doubleway output step-down controller circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1, in the utility model embodiment, a kind of doubleway output step-down controller circuit, comprises chip U1, diode D1, fuse FU, inductance L 1, electric capacity C1 and triode Q1, fuse FU one end connects 220V alternating current, the fuse FU other end connects diode D1 positive pole, diode D1 negative pole connects inductance L 1 and electric capacity C1 respectively, inductance L 1 other end connects electric capacity C2 and chip U1 pin D respectively, chip U1 pin FB respectively contact resistance R1 and resistance R2, chip U1 pin BP connects electric capacity C3, and chip U1 pin S connects the electric capacity C3 other end respectively, the resistance R1 other end, diode D2 negative pole, electric capacity C4, inductance L 2 and resistance R3, the electric capacity C4 other end is the contact resistance R2 other end and diode D3 negative pole respectively, and diode D3 positive pole connects inductance L 2 other end respectively, electric capacity C5, resistance R4, resistance R7, resistance R6 and output V1, the resistance R6 other end is contact resistance R5 respectively, diode D4 positive pole, the electric capacity C5 other end, the resistance R3 other end, diode D2 positive pole, the electric capacity C2 other end, the electric capacity C1 other end and the 220V alternating current other end ground connection, diode D4 negative pole contact resistance R8, the resistance R8 other end is the contact resistance R7 other end and triode Q1 base stage respectively, the triode Q1 collector electrode contact resistance R4 other end, triode Q1 emitter is the contact resistance R5 other end and output V2 respectively.
Chip U1 model is LNK304DN.
Output V1 voltage is 12V.
Output V2 voltage is 3.3V.
Operation principle of the present utility model is: refer to Fig. 1, diode D1 provides AC input rectifying, and electric capacity C1 and electric capacity C2 provides smothing filtering, they form pi type filter together with inductance L 1, by frequency jittering function integrated in chip U1, EMI is reduced further, MOSFET blocking interval within it, electric capacity C4 charges to output voltage (pressure drop of D2 and D3 is offset) by diode D3, this voltage is used for the resitstance voltage divider that consists of resistance R1 and resistance R2 for chip U1 provides feedback, in each switch periods, the pin FB of capital to chip U1 samples, if the electric current flowing into chip U1 feedback pin is less than 49 μ A, by the enable cycle subsequently, in each enable switch periods, the electric current flowing through inductance L 2 and electric capacity C5 is linearly increased.Once reach Internal current limit point, namely MOSFET turns off, inductive current carries out afterflow by diode D2, by adjusting ratio that is enable and disable period, voltage stabilizing can be maintained, by by triode Q1, resistance R4, resistance R5, resistance R7, it is very simple that resistance R8 and diode D4 forms, low cost discrete linear transformer, the voltage stabilizing that 3.3V exports can be maintained, the 10mA electric current set by resistance R7 and resistance R8 with reference to Zener zener diode D4 is biased, select the value of diode D4, make its VBE pressure drop higher than the output voltage required, so that triode Q1 is connected into emitter follower form and obtains 3.3V output, resistance R8 can control more accurately to output voltage set point, resistance R4 can provide protection to triode Q1 under overcurrent condition.
Claims (4)
1. a doubleway output step-down controller circuit, comprises chip U1, diode D1, fuse FU, inductance L 1, electric capacity C1 and triode Q1, it is characterized in that, described fuse FU one end connects 220V alternating current, the fuse FU other end connects diode D1 positive pole, diode D1 negative pole connects inductance L 1 and electric capacity C1 respectively, and inductance L 1 other end connects electric capacity C2 and chip U1 pin D respectively, and chip U1 pin FB is contact resistance R1 and resistance R2 respectively, chip U1 pin BP connects electric capacity C3, and chip U1 pin S connects the electric capacity C3 other end respectively, the resistance R1 other end, diode D2 negative pole, electric capacity C4, inductance L 2 and resistance R3, the electric capacity C4 other end is the contact resistance R2 other end and diode D3 negative pole respectively, and diode D3 positive pole connects inductance L 2 other end respectively, electric capacity C5, resistance R4, resistance R7, resistance R6 and output V1, the resistance R6 other end is contact resistance R5 respectively, diode D4 positive pole, the electric capacity C5 other end, the resistance R3 other end, diode D2 positive pole, the electric capacity C2 other end, the electric capacity C1 other end and the 220V alternating current other end ground connection, diode D4 negative pole contact resistance R8, the resistance R8 other end is the contact resistance R7 other end and triode Q1 base stage respectively, the triode Q1 collector electrode contact resistance R4 other end, triode Q1 emitter is the contact resistance R5 other end and output V2 respectively.
2. doubleway output step-down controller circuit according to claim 1, is characterized in that, described chip U1 model is LNK304DN.
3. doubleway output step-down controller circuit according to claim 1, is characterized in that, described output V1 voltage is 12V.
4. doubleway output step-down controller circuit according to claim 1, is characterized in that, described output V2 voltage is 3.3V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520152554.3U CN204442190U (en) | 2015-03-18 | 2015-03-18 | A kind of doubleway output step-down controller circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520152554.3U CN204442190U (en) | 2015-03-18 | 2015-03-18 | A kind of doubleway output step-down controller circuit |
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| CN204442190U true CN204442190U (en) | 2015-07-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201520152554.3U Expired - Fee Related CN204442190U (en) | 2015-03-18 | 2015-03-18 | A kind of doubleway output step-down controller circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107123229A (en) * | 2017-06-15 | 2017-09-01 | 合肥讯邦网络科技有限公司 | A kind of electronic information communication signal processing system |
-
2015
- 2015-03-18 CN CN201520152554.3U patent/CN204442190U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107123229A (en) * | 2017-06-15 | 2017-09-01 | 合肥讯邦网络科技有限公司 | A kind of electronic information communication signal processing system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C41 | Transfer of patent application or patent right or utility model | ||
| CB03 | Change of inventor or designer information |
Inventor after: Wang Yong Inventor before: Zhang Wanggen |
|
| COR | Change of bibliographic data | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20160907 Address after: 518131, Shenzhen, Guangdong province Longhua New District Guanlan street, Guanlan, Zhang hang Keng Keng Wai Industrial Zone, No. six, No. two, building G, building Patentee after: Shenzhen city science and Technology Co. Ltd. Address before: 315700 Western Zhou Industrial Park, Xiangshan County, Ningbo, Zhejiang Patentee before: Zhang Wanggen |
|
| CB03 | Change of inventor or designer information |
Inventor after: He Shendong Inventor before: Wang Yong |
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| COR | Change of bibliographic data | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150701 Termination date: 20180318 |
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| CF01 | Termination of patent right due to non-payment of annual fee |