CN204761313U - Voltage feedback control circuit - Google Patents
Voltage feedback control circuit Download PDFInfo
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- CN204761313U CN204761313U CN201520324739.8U CN201520324739U CN204761313U CN 204761313 U CN204761313 U CN 204761313U CN 201520324739 U CN201520324739 U CN 201520324739U CN 204761313 U CN204761313 U CN 204761313U
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- electric capacity
- reference source
- transformer
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- 238000010276 construction Methods 0.000 claims description 2
- 238000004804 winding Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 2
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000035800 maturation Effects 0.000 description 1
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Abstract
The utility model discloses a voltage feedback control circuit, including transformer T1, transformer T1 is connected to high -pressure load end after connecting gradually diode V2, filter circuit, and transformer T1's output still is connected with opto -coupler U1 and reference source U2, and transformer T1's secondary coil N3 is the partly of output winding, and be different from commonly used generally designing secondary coil N3 and be an independent winding, the utility model provides an output voltage that exists among the prior art to be higher than 40V's power internal control structure complicated, problem that feedback effect is poor.
Description
Technical field
The utility model belongs to new electronic component technical field, is specifically related to a kind of Voltage Feedback control circuit.
Background technology
In the development process of power supply, for (below 40V) that low-voltage direct exports, there is the circuit of many maturations, for higher than 40V output voltage, control circuit all seems complex structure, want to go to control higher than 40V output voltage with simple circuit, prior art does not also have this way.
Utility model content
The purpose of this utility model is to provide a kind of Voltage Feedback control circuit, solves the output voltage existed in prior art complicated higher than the power source internal control structure of 40V, the problem of feedback effects difference.
The technical scheme that the utility model adopts is, a kind of Voltage Feedback control circuit, comprises transformer T1, and transformer T1 is connected to high-voltage load end after connecting diode V2, filter circuit successively, and the output of transformer T1 is also connected with optocoupler U1 and a reference source U2.
Feature of the present utility model is also,
The structure of transformer T1 is: comprise primary coil N1 and secondary coil N2, secondary coil N3,3 pins of secondary coil N2 are connected with the positive input of diode V2,4 pins of secondary coil N2 are connected with 2 pins of secondary coil N3, electric capacity C1 and diode V1 is connected with in turn between 1 pin of secondary coil N3 and 2 pins, 1 pin of secondary coil N3 is also connected to node A1, and 2 pins of secondary coil N3 are also connected to node A2.
Filter circuit construction is: comprise the electric capacity C3 be connected between described diode V2 forward output and node A1, the two ends of electric capacity C3 are also parallel with electric capacity C2, and the positive voltage terminal of electric capacity C2 is connected with high-voltage load end, and the negative voltage side of electric capacity C2 is connected to ground.
The concrete connecting circuit of transformer T1 and optocoupler U1 and a reference source U2 is: be connected to node A2 after the 1 pin contact resistance R1 of optocoupler U1, 2 pins of optocoupler U1 are connected with 2 pins of a reference source U2, resistance R4 is connected with between 3 pins of a reference source U2 and 1 pin, the 3 pins also ground connection of a reference source U2 simultaneously, resistance R2 and electric capacity C6 is connected with in turn between 2 pins of a reference source U2 and 1 pin, node A3 is provided with between electric capacity C6 and described resistance R4, electric capacity C5 is also connected with between 2 pins of a reference source U2 and node A3, high-voltage load end is connected to after node A3 contact resistance R3.
The model of optocoupler U1 is PC817.
The model of a reference source U2 is TL431.
The beneficial effects of the utility model are, a kind of Voltage Feedback control circuit, when the AC energy of transformer primary side is sent to secondary by transformer, N2, N3 winding is coupled certain voltage respectively, N2 winding is by diode V1 rectification, electric capacity C1 filtering produces auxiliary power supply VCC, and design makes this voltage lower than 20V, powering for optocoupler U1 and a reference source U2 for rear end.N2 and N3 windings in series is got up, then by diode V2 rectification, and electric capacity C2, C3 filtering, produce the output voltage needed, this voltage by resistance R3 R4 dividing potential drop, the comparison end delivering to a reference source U2 regulates the electric current flowing through optocoupler U1, and then makes output voltage stabilization.
Accompanying drawing explanation
Fig. 1 is the circuit structure diagram of a kind of Voltage Feedback control circuit of the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
A kind of Voltage Feedback control circuit of the utility model, circuit structure as shown in Figure 1, comprise transformer T1, the structure of transformer T1 is: comprise primary coil N1 and secondary coil N2, secondary coil N3, 3 pins of secondary coil N2 are connected with the positive input of diode V2, 4 pins of secondary coil N2 are connected with 2 pins of secondary coil N3, electric capacity C1 and diode V1 is connected with in turn between 1 pin of secondary coil N3 and 2 pins, 1 pin of described secondary coil N3 is also connected to node A1, 2 pins of secondary coil N3 are also connected to node A2, electric capacity C3 is connected with between diode V2 forward output and node A1, the two ends of electric capacity C3 are also parallel with electric capacity C2, the positive voltage terminal of electric capacity C2 is connected with high-voltage load end, the negative voltage side of electric capacity C2 is connected to ground, be connected with 1 pin of optocoupler U1 after node A2 contact resistance R1, 2 pins of optocoupler U1 are connected with 2 pins of a reference source U2, resistance R4 is connected with between 3 pins of a reference source U2 and 1 pin, the 3 pins also ground connection of a reference source U2 simultaneously, resistance R2 and electric capacity C6 is connected with in turn between 2 pins of a reference source U2 and 1 pin, node A3 is provided with between electric capacity C6 and resistance R4, electric capacity C5 is also connected with between 2 pins of a reference source U2 and node A3, high-voltage load end is connected to after node A3 contact resistance R3, the model of optocoupler U1 is PC817, the model of a reference source U2 is TL431.
A kind of Voltage Feedback control circuit of the utility model, when the AC energy of transformer T1 primary coil N1 is sent to secondary coil by transformer, secondary coil N2, secondary coil N3 winding are coupled certain voltage respectively, secondary coil N2 winding is by diode V1 rectification, electric capacity C1 filtering produces auxiliary power supply VCC, design makes this voltage lower than 20V, powering for optocoupler U1 and a reference source U2 for rear end.Secondary coil N2, secondary coil N3 windings in series are got up, then by diode V2 rectification, electric capacity C2, C3 filtering, produce the output voltage needed, this voltage by resistance R3 R4 dividing potential drop, the comparison end delivering to a reference source U2 regulates the electric current flowing through optocoupler U1, and then makes output voltage stabilization.
It is a little the secondary current supply circuit that is made up of secondary coil N3 and diode V1, electric capacity C1 that the utility model is mainly protected.Be different from general, this secondary coil N3 exports the part of winding, is different from conventional general secondary coil N3 to be designed to an independently winding.
The utility model, for higher than 40V output voltage, control circuit obviously to be simple and easy to build and also control stability high, when prior art lacks the control method that power circuit controls higher than 40V output voltage, have very large meaning for this area.
Claims (4)
1. a Voltage Feedback control circuit, it is characterized in that, comprise transformer (T1), transformer (T1) is connected to high-voltage load end after connecting diode (V2), filter circuit successively, and the output of described transformer (T1) is also connected with optocoupler (U1) and a reference source (U2).
2. a kind of Voltage Feedback control circuit according to claim 1, it is characterized in that, the structure of described transformer (T1) is: comprise primary coil (N1) and secondary coil (N2), secondary coil N3, 3 pins of described secondary coil N2 are connected with the positive input of described diode (V2), 4 pins of secondary coil N2 are connected with 2 pins of secondary coil N3, electric capacity C1 and diode (V1) is connected with in turn between 1 pin of secondary coil N3 and 2 pins, 1 pin of described secondary coil N3 is also connected to node A1, 2 pins of secondary coil N3 are also connected to node A2.
3. a kind of Voltage Feedback control circuit according to claim 1, it is characterized in that, described filter circuit construction is: comprise the electric capacity C3 be connected between described diode (V2) forward output and node A10, the two ends of electric capacity C3 are also parallel with electric capacity C2, the positive voltage terminal of electric capacity C2 is connected with high-voltage load end, and the negative voltage side of electric capacity C2 is connected to ground.
4. a kind of Voltage Feedback control circuit according to claim 1, it is characterized in that, described transformer (T1) with the concrete connecting circuit of optocoupler (U1) and a reference source (U2) is: be connected to node A2 after 1 pin contact resistance R1 of optocoupler (U1), 2 pins of optocoupler (U1) are connected with 2 pins of a reference source (U2), resistance R4 is connected with between 3 pins of a reference source (U2) and 1 pin, the 3 pins also ground connection of a reference source (U2) simultaneously, resistance R2 and electric capacity C6 is connected with in turn between 2 pins of a reference source (U2) and 1 pin, node A3 is provided with between electric capacity C6 and described resistance R4, electric capacity C5 is also connected with between 2 pins of a reference source (U2) and node A3, high-voltage load end is connected to after described node A3 contact resistance R3, the model of described optocoupler (U1) is PC817, the model of described a reference source (U2) is TL431.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520324739.8U CN204761313U (en) | 2015-05-19 | 2015-05-19 | Voltage feedback control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520324739.8U CN204761313U (en) | 2015-05-19 | 2015-05-19 | Voltage feedback control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204761313U true CN204761313U (en) | 2015-11-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520324739.8U Expired - Fee Related CN204761313U (en) | 2015-05-19 | 2015-05-19 | Voltage feedback control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204761313U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113141120A (en) * | 2020-01-17 | 2021-07-20 | 力林科技股份有限公司 | Voltage conversion device and voltage conversion method thereof |
-
2015
- 2015-05-19 CN CN201520324739.8U patent/CN204761313U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113141120A (en) * | 2020-01-17 | 2021-07-20 | 力林科技股份有限公司 | Voltage conversion device and voltage conversion method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| 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: 20151111 |