CN202364123U - Circuit for improving multi-output cross regulation of switching power supply - Google Patents
Circuit for improving multi-output cross regulation of switching power supply Download PDFInfo
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- CN202364123U CN202364123U CN2011205275591U CN201120527559U CN202364123U CN 202364123 U CN202364123 U CN 202364123U CN 2011205275591 U CN2011205275591 U CN 2011205275591U CN 201120527559 U CN201120527559 U CN 201120527559U CN 202364123 U CN202364123 U CN 202364123U
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Abstract
The utility model discloses a circuit for improving multi-output cross regulation of a switching power supply. The circuit has reliable and practical performances and low cost, is particularly suitable for occasions with low-cost requirements and improves the cross regulation of multi-output well; and each output has high accuracy. According to the utility model, the circuit for improving multi-output cross regulation of switching power supply comprises two optocouplers of D2 and D4, eight resistors of R1, R2, R3, R4, R5, R6, R7 and R8 and two three-terminal adjustable shunt reference sources of D1 and D3.
Description
Technical field
The utility model relates to a kind of circuit, more specifically to a kind of Switching Power Supply multichannel output intersection regulation circuit that improves, belongs to field of power electronics.
Background technology
The Switching Power Supply of multichannel output is widely used in the power supply power supply of various power electronic systems.For the situation of multichannel output, that lower output voltage usually, that the electric current excursion is bigger road is carried out feedback regulation control as main output circuit to it, to guarantee can to keep stable voltage output when input voltage and the load variations.In the ideal case, auxiliary output voltage and main output voltage satisfy the relation of transformer turn ratio, as long as promptly make main output voltage keep stable, then auxiliary output voltage also can keep stable.But in fact owing to receive the influence of the resistance, current circuit parasitic parameter etc. of leakage inductance, winding between each winding of transformer, auxiliary output voltage changes with the variation of output loading.Common fully loaded when main output, when assisting the output underloading, auxiliary output voltage will raise; And when main output underloading, auxiliary output full load, auxiliary output voltage will reduce.The load intersection regulation problem of multichannel that Here it is output.Load intersection regulation is very important performance index in the output of Switching Power Supply multichannel.Existing improvement output intersection regulation circuit kind is a lot, or more complicated, or has only theory significance, in the circuit of reality, be difficult to be applied, and cost is relatively more expensive.Therefore need a kind of brand-new circuit of exploitation to realize improvement to multichannel output intersection regulation.
Summary of the invention
The utility model has well solved deficiency and the problem that exists in the above-mentioned prior art; A kind of circuit that improves Switching Power Supply multichannel output intersection regulation is provided; This circuit performance is reliable and practical, and is with low cost, and each road output all has very high precision; Be particularly suitable for the low-cost occasion that requires, well improved the intersection regulation of multichannel output.
The technical scheme of the utility model is following:
The Switching Power Supply multichannel of improving of the utility model is exported intersection regulation circuit; It includes optocoupler D2 and two optocouplers of optocoupler D4; Resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8 be totally 8 resistance and 2 three end adjustable shunting a reference source D1 and D3; Wherein resistance R 1 one ends link to each other with an end of main output cathode and resistance R 3; One end of the other end of resistance R 1 and resistance R 2 and the light-emitting diode input of optocoupler D2 are connected together; The negative electrode of the output of the reflective diode of the other end of resistance R 2 and optocoupler D2 and the adjustable shunting a reference source of three ends D1 is connected together; The anode of three ends are adjustable shunting a reference source D1 is connected together with the negative terminal of main output, an end of resistance R 4, and the reference edge of an end of the other end of resistance R 4 and resistance R 3 and the adjustable shunting a reference source of three ends D1 is connected together, and the efferent duct collector electrode of optocoupler D2 links to each other with the positive pole of feedback; The efferent duct emitter of optocoupler D2 links to each other with the efferent duct collector electrode of optocoupler D4, and the efferent duct emitter of optocoupler D4 links to each other with the negative pole of feedback; Resistance R 5 one ends link to each other with an end of auxilliary output cathode and resistance R 7; One end of the other end and resistance R 6 and the light-emitting diode input of optocoupler D4 are connected together; The negative electrode of the output of the reflective diode of the other end of resistance R 6 and optocoupler D4 and the adjustable shunting a reference source of three ends D3 is connected together; Three ends are adjustable, and the anode of shunting a reference source D3 and the negative terminal of auxilliary output and an end of resistance R 8 are connected together, and the reference edge of an end of the other end of resistance R 8 and resistance R 7 and the adjustable shunting a reference source of three ends D3 is connected together.
The Switching Power Supply multichannel of improving of the utility model is exported intersection regulation circuit, and its further technical scheme is that described resistance R 1 is 1.6K ohm with R5, and resistance R 2 is 1K ohm with R6, and resistance R 3 is 51K ohm with R7, and resistance R 4 and R8 are 10K ohm.
The Switching Power Supply multichannel of improving of the utility model is exported intersection regulation circuit, and its further technical scheme can also be that the model of described three ends adjustable shunting a reference source D1 and D3 is TL431.
The Switching Power Supply multichannel of improving of the utility model is exported intersection regulation circuit, and its further technical scheme can also be that the model of described optocoupler D2 and D4 is LVC817.
The Switching Power Supply multichannel of improving of the utility model is exported intersection regulation circuit; Its described auxilliary output circuit can have a plurality of; All there is the feedback circuit of oneself on each road; Each feedback element is in series, and described so main output in fact all is the same with the output effect of auxilliary output, can both reach same output accuracy.
The course of work of the utility model entire circuit is following: the reference edge of three ends are adjustable shunting a reference source D1 is output as 2.5V.Setting main output voltage in this circuit is 15V (can adjust through resistance R 3, R4); Be output as when being higher than 15V when main, the electric current that passes through on the resistance R 1 will become greatly, the change of the input current of optocoupler D2 greatly, the voltage difference between the efferent duct collector and emitter of optocoupler D2 will become big; The signal that arrives feedback like this becomes big, regulates the output of pwm signal through Switching Power Supply internal regulation circuit, and main output voltage is diminished, and will get back to 15V.Be output as when being lower than 15V when main, the electric current that passes through on the resistance R 1 will diminish, and the input current of optocoupler D2 diminishes, and the voltage difference between the efferent duct collector and emitter of optocoupler D2 will diminish; Signal to feedback diminishes like this, regulates the output of pwm signal through Switching Power Supply internal regulation circuit, makes main output voltage become big, will get back to 15V.Set auxilliary output voltage in this circuit and also be 15V (can adjust) through resistance R 7, R8; Its course of work is the same with main output.
The utlity model has following beneficial effect:
The circuit performance of the utility model is reliable and practical, and is with low cost, is particularly suitable for low-cost demanding occasion.Its superiority is not only formed in the cheap and simple structure of cost; The more important thing is, realized to play FEEDBACK CONTROL, when power input voltage, power source loads generation great change the output on each road; The output on each road all is very stable, the precision that each Lu Douyou is very high.
Description of drawings
Fig. 1 is the electrical block diagram of the utility model
Embodiment
Below in conjunction with accompanying drawing the utility model technology contents is explained:
As shown in Figure 1; The Switching Power Supply multichannel output intersection regulation circuit that improves of the utility model includes optocoupler D2 and two optocouplers of optocoupler D4; Resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8 be totally 8 resistance and 2 three end adjustable shunting a reference source D1 and D3; Wherein resistance R 1 one ends link to each other with an end of main output cathode and resistance R 3; One end of the other end of resistance R 1 and resistance R 2 and the light-emitting diode input of optocoupler D2 are connected together; The negative electrode of the output of the reflective diode of the other end of resistance R 2 and optocoupler D2 and the adjustable shunting a reference source of three ends D1 is connected together; The anode of three ends are adjustable shunting a reference source D1 is connected together with the negative terminal of main output, an end of resistance R 4, and the reference edge of an end of the other end of resistance R 4 and resistance R 3 and the adjustable shunting a reference source of three ends D1 is connected together, and the efferent duct collector electrode of optocoupler D2 links to each other with the positive pole of feedback; The efferent duct emitter of optocoupler D2 links to each other with the efferent duct collector electrode of optocoupler D4, and the efferent duct emitter of optocoupler D4 links to each other with the negative pole of feedback; Resistance R 5 one ends link to each other with an end of auxilliary output cathode and resistance R 7; One end of the other end and resistance R 6 and the light-emitting diode input of optocoupler D4 are connected together; The negative electrode of the output of the reflective diode of the other end of resistance R 6 and optocoupler D4 and the adjustable shunting a reference source of three ends D3 is connected together; Three ends are adjustable, and the anode of shunting a reference source D3 and the negative terminal of auxilliary output and an end of resistance R 8 are connected together, and the reference edge of an end of the other end of resistance R 8 and resistance R 7 and the adjustable shunting a reference source of three ends D3 is connected together.Wherein resistance R 1 is 1.6K ohm with R5, and resistance R 2 is 1K ohm with R6, and resistance R 3 is 51K ohm with R7, and resistance R 4 is 10K ohm with R8; The model of three ends are adjustable shunting a reference source D1 and D3 is TL43; The model of optocoupler D2 and D4 is LVC817.
Claims (4)
1. one kind is improved Switching Power Supply multichannel output intersection regulation circuit; It is characterized in that including two optocouplers of optocoupler D2 and optocoupler D4; Resistance R 1, resistance R 2, resistance R 3, resistance R 4, resistance R 5, resistance R 6, resistance R 7, resistance R 8 be totally 8 resistance and 2 three end adjustable shunting a reference source D1 and D3; Wherein resistance R 1 one ends link to each other with an end of main output cathode and resistance R 3; One end of the other end of resistance R 1 and resistance R 2 and the light-emitting diode input of optocoupler D2 are connected together; The negative electrode of the output of the reflective diode of the other end of resistance R 2 and optocoupler D2 and the adjustable shunting a reference source of three ends D1 is connected together; The anode of three ends are adjustable shunting a reference source D1 is connected together with the negative terminal of main output, an end of resistance R 4, and the reference edge of an end of the other end of resistance R 4 and resistance R 3 and the adjustable shunting a reference source of three ends D1 is connected together, and the efferent duct collector electrode of optocoupler D2 links to each other with the positive pole of feedback; The efferent duct emitter of optocoupler D2 links to each other with the efferent duct collector electrode of optocoupler D4, and the efferent duct emitter of optocoupler D4 links to each other with the negative pole of feedback; Resistance R 5 one ends link to each other with an end of auxilliary output cathode and resistance R 7; One end of the other end and resistance R 6 and the light-emitting diode input of optocoupler D4 are connected together; The negative electrode of the output of the reflective diode of the other end of resistance R 6 and optocoupler D4 and the adjustable shunting a reference source of three ends D3 is connected together; Three ends are adjustable, and the anode of shunting a reference source D3 and the negative terminal of auxilliary output and an end of resistance R 8 are connected together, and the reference edge of an end of the other end of resistance R 8 and resistance R 7 and the adjustable shunting a reference source of three ends D3 is connected together.
2. the Switching Power Supply multichannel output intersection regulation circuit that improves according to claim 1 is characterized in that described resistance R 1 is 1.6K ohm with R5, and resistance R 2 is 1K ohm with R6, and resistance R 3 is 51K ohm with R7, and resistance R 4 is 10K ohm with R8.
3. the Switching Power Supply multichannel output intersection regulation circuit that improves according to claim 1 is characterized in that the model of described three ends adjustable shunting a reference source D1 and D3 is TL431.
4. the Switching Power Supply multichannel output intersection regulation circuit that improves according to claim 1, the model that it is characterized in that described optocoupler D2 and D4 is LVC817.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205275591U CN202364123U (en) | 2011-12-15 | 2011-12-15 | Circuit for improving multi-output cross regulation of switching power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011205275591U CN202364123U (en) | 2011-12-15 | 2011-12-15 | Circuit for improving multi-output cross regulation of switching power supply |
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| Publication Number | Publication Date |
|---|---|
| CN202364123U true CN202364123U (en) | 2012-08-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011205275591U Expired - Fee Related CN202364123U (en) | 2011-12-15 | 2011-12-15 | Circuit for improving multi-output cross regulation of switching power supply |
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| CN (1) | CN202364123U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102420525A (en) * | 2011-12-15 | 2012-04-18 | 南京亚派科技实业有限公司 | Circuit for improving multi-path output cross regulation rate of switching power supply |
| CN105305826A (en) * | 2014-07-28 | 2016-02-03 | 苏州弗莱希智能科技有限公司 | Multi-output switching power supply circuit |
-
2011
- 2011-12-15 CN CN2011205275591U patent/CN202364123U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102420525A (en) * | 2011-12-15 | 2012-04-18 | 南京亚派科技实业有限公司 | Circuit for improving multi-path output cross regulation rate of switching power supply |
| CN105305826A (en) * | 2014-07-28 | 2016-02-03 | 苏州弗莱希智能科技有限公司 | Multi-output switching power supply circuit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120801 Termination date: 20121215 |