CN201854187U - Voltage-stabilizing loop of isolation flyback switch power supply - Google Patents
Voltage-stabilizing loop of isolation flyback switch power supply Download PDFInfo
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- CN201854187U CN201854187U CN2010205679923U CN201020567992U CN201854187U CN 201854187 U CN201854187 U CN 201854187U CN 2010205679923 U CN2010205679923 U CN 2010205679923U CN 201020567992 U CN201020567992 U CN 201020567992U CN 201854187 U CN201854187 U CN 201854187U
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Abstract
The utility model relates to a voltage-stabilizing loop of an isolation flyback switch power supply, which comprises an input rectifying filter circuit (11), a high-frequency transformer transmitter-receiver (TR), a flyback type switch power supply pulse width modulation (PWM) chip integrated circuit 1 (IC1), a voltage-stabilizing circuit and an output rectifying filter circuit. The voltage-stabilizing loop is characterized in that the voltage-stabilizing circuit consists of a voltage stabilizer, a current limiter and a photoelectric coupler; the voltage stabilizer is connected with the current limiter to form a voltage-stabilizing and current-limiting passageway which is in bridge joint with the positive voltage output end of the rectifying filter circuit and the positive input end of the photoelectric coupler; the negative input end of the photoelectric coupler is grounded; and the output end of the photoelectric coupler is connected with the feedback signal input end of the flyback type switch power supply PWM chip IC1. By eliminating a three-end voltage stabilizer and a sampling resistor component, the structure of a voltage-stabilizing loop circuit is simplified, so that the beneficial effects of simplifying the circuit structure and reducing the cost can be achieved. The voltage-stabilizing loop is mainly adopted by an isolation flyback switch power supply circuit such as a switch power supply product for home appliances.
Description
Technical field
The utility model relates to a kind of voltage stabilizing loop, particularly relates to a kind of voltage stabilizing loop of isolating reverse exciting switching voltage regulator.Belong to the switch power technology field.
Background technology
At present, Switching Power Supply is widely used.Stablizing of the direct control output voltage of voltage stabilizing loop of isolation reverse exciting switching voltage regulator is related to Switching Power Supply safety, has the voltage stabilizing loop of high stability, can prevent effectively that output voltage is too high or too low, thereby ensures people's personal safety.
Existing Switching Power Supply typical circuit generally selects for use three terminal regulator TL431 to come regulated output voltage.This typical circuit comprises: output rectifier and filter, output voltage sample circuit, inner three terminal regulator a reference source, three terminal regulator external feedback network, optocoupler are formed.As shown in Figure 2, R3, C2 form three terminal regulator external feedback network; R4, R5 output voltage sample circuit; D2, C3 output rectifier and filter.When output voltage rises, R4, R5 mid-point voltage rise, the inner adjustment of IC3 this moment 3 pin voltages descend the electric current that flows through IC2 (1,2) pin are increased, descend through the inner FB pin voltage that makes PWM IC of adjusting of IC2, thereby the output of PWM IC drives duty ratio to be reduced, output voltage descends, and reaches the purpose of stable output.When output voltage descends, R4, R5 mid-point voltage descend, the inner adjustment of IC3 this moment 3 pin voltages rise the electric current that flows through IC2 (1,2) pin are reduced, rise through the inner FB pin voltage that makes PWMIC of adjusting of IC2, thereby the output of PWM IC drives duty ratio to increase, output voltage rises, and reaches the purpose of stable output.Adopt the weak point of above-mentioned voltage stabilizing loop to be: used components and parts are more, circuit more complicated, production failure rate height, components and parts cost height.
The utility model content
The purpose of this utility model, be for the voltage stabilizing loop that overcomes Switching Power Supply of the prior art exists that components and parts are more, circuit more complicated, failure rate height, shortcoming that cost is high, a kind of voltage stabilizing loop of isolating reverse exciting switching voltage regulator is provided, under the constant prerequisite of the voltage stabilizing loop performance that guarantees Switching Power Supply, simplify circuit, reduce cost.
The purpose of this utility model can reach by following measure:
A kind of voltage stabilizing loop of isolating reverse exciting switching voltage regulator comprises input rectifying filter circuit (11), high frequency transformer TR, inverse-excitation type switch power-supply PWM chip IC 1, voltage stabilizing circuit and output rectifier and filter; The output of input rectifying filter circuit (11) connects the power input of inverse-excitation type switch power-supply PWM chip IC 1 by the elementary winding of high frequency transformer TR, two VCC power ends of the secondary winding of high frequency transformer TR by current rectifying and wave filtering circuit connection inverse-excitation type switch power-supply PWM chip IC 1, output rectifier and filter is connected across the two ends of one of high frequency transformer TR secondary winding; It is characterized in that: described voltage stabilizing circuit is made up of pressurizer, flow restricter and photoelectrical coupler, connect into the voltage stabilizing flow-limiting passage by pressurizer, flow restricter and be connected across the positive voltage output end of current rectifying and wave filtering circuit and the positive input terminal of photoelectrical coupler, the negative input end ground connection of photoelectrical coupler, the output of photoelectrical coupler connect the feedback signal input of inverse-excitation type switch power-supply PWM chip IC 1.
The purpose of this utility model can also reach by following measure:
A kind of execution mode of the present utility model is: pressurizer is made of voltage stabilizing didoe ZD1, and flow restricter current-limiting resistance R2 constitutes, and photoelectrical coupler is made of optocoupler diode IC2; The positive pole of voltage stabilizing didoe ZD1 is connected with the end of current-limiting resistance R2, negative pole is connected with filter capacitor C3 is anodal, the other end of current-limiting resistance R2 links to each other with the 1st pin of optocoupler diode IC2, the 2nd pin of optocoupler diode IC2 links to each other with GND, the 3rd pin of optocoupler diode IC2 links to each other with the feedback input end FB pin of PWM integrated circuit (IC) 1, and the 4th pin of optocoupler diode IC2 meets high pressure ground SG.
A kind of execution mode of the present utility model is: output rectifier and filter is made of rectifier diode D2 and filter capacitor C3, be connected across two ends of one of the secondary winding of high frequency transformer TR after rectifier diode D2 and the filter capacitor C3 series connection, the junction of rectifier diode D2 and filter capacitor C3 forms positive voltage output end, filter capacitor C3 minus earth GND and formation negative voltage output.
The beneficial effects of the utility model are:
1, compared with prior art,, thereby simplified voltage stabilizing loop circuit structure, therefore had the beneficial effect of simplifying circuit structure and reducing cost because the utility model has saved a three terminal regulator and sample resistance assembly.
2, the utility model is mainly used in isolating in the inverse-excitation type switch power-supply circuit, in household appliances Switching Power Supply product.
Description of drawings
Fig. 1 is the circuit theory diagrams of the described isolation reverse exciting switching voltage regulator of the utility model specific embodiment.
Fig. 2 is the circuit theory diagrams of isolation reverse exciting switching voltage regulator of the prior art.
Embodiment
Below in conjunction with drawings and Examples the utility model is described in further detail:
Specific embodiment 1:
With reference to Fig. 1, present embodiment comprises input rectifying filter circuit 11, high frequency transformer TR, inverse-excitation type switch power-supply PWM chip IC 1, voltage stabilizing circuit and output rectifier and filter; The output of input rectifying filter circuit 11 connects the power input of inverse-excitation type switch power-supply PWM chip IC 1 by the elementary winding of high frequency transformer TR, two VCC power ends of the secondary winding of high frequency transformer TR by current rectifying and wave filtering circuit connection inverse-excitation type switch power-supply PWM chip IC 1, output rectifier and filter is connected across the two ends of one of high frequency transformer TR secondary winding; Described voltage stabilizing circuit is made up of pressurizer, flow restricter and photoelectrical coupler, connect into the voltage stabilizing flow-limiting passage by pressurizer, flow restricter and be connected across the positive voltage output end of current rectifying and wave filtering circuit and the positive input terminal of photoelectrical coupler, the negative input end ground connection of photoelectrical coupler, the output of photoelectrical coupler connect the feedback signal input of inverse-excitation type switch power-supply PWM chip IC 1.
In the present embodiment, pressurizer is made of voltage stabilizing didoe ZD1, and flow restricter is made of current-limiting resistance R2, and photoelectrical coupler is made of optocoupler diode IC2; The positive pole of voltage stabilizing didoe ZD1 is connected with the end of current-limiting resistance R2, negative pole is connected with filter capacitor C3 is anodal, the other end of current-limiting resistance R2 links to each other with the 1st pin of optocoupler diode IC2, the 2nd pin of optocoupler diode IC2 links to each other with GND, the 3rd pin of optocoupler diode IC2 links to each other with the feedback input end FB pin of PWM integrated circuit (IC) 1, and the 4th pin of optocoupler diode IC2 meets high pressure ground SG.Output rectifier and filter is made of rectifier diode D2 and filter capacitor C3, be connected across two ends of one of the secondary winding of high frequency transformer TR after rectifier diode D2 and the filter capacitor C3 series connection, the junction of rectifier diode D2 and filter capacitor C3 forms positive voltage output end, filter capacitor C3 minus earth GND and formation negative voltage output.
The operation principle of present embodiment:
High-frequency alternating current obtains level and smooth DC power supply after rectifier diode D2 rectification, filter capacitor C3 filtering.When output voltage rises, the electric current that flows through voltage stabilizing didoe ZD1 increases, the electric current that flows through photoelectrical coupler IC2 interior light emitting diodes (1,2) pin simultaneously increases, photoelectrical coupler IC2 (3,4) pin pressure drop reduces, the FB pin of inverse-excitation type switch power-supply PWM integrated circuit (IC) 1 (feedback pin) voltage descends the IC1 output duty cycle is reduced, and reaches the purpose of regulated output voltage.
When output voltage descends, the electric current that flows through voltage stabilizing didoe ZD1 reduces, the electric current that flows through photoelectrical coupler IC2 interior light emitting diodes (1,2) pin simultaneously reduces, photoelectrical coupler IC2 (3,4) pin pressure drop increases, the voltage of the FB pin of inverse-excitation type switch power-supply PWM integrated circuit (IC) 1 (feedback pin) increases increases the IC1 output duty cycle, reaches the purpose of regulated output voltage.
The above; it only is the preferable specific embodiment of the utility model; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the scope that the utility model discloses; be equal to replacement or change according to the technical solution of the utility model and utility model design thereof, all belonged to protection range of the present utility model.
Claims (3)
1. a voltage stabilizing loop of isolating reverse exciting switching voltage regulator comprises input rectifying filter circuit (11), high frequency transformer TR, inverse-excitation type switch power-supply PWM chip IC 1, voltage stabilizing circuit and output rectifier and filter; The output of input rectifying filter circuit (11) connects the power input of inverse-excitation type switch power-supply PWM chip IC 1 by the elementary winding of high frequency transformer TR, two VCC power ends of the secondary winding of high frequency transformer TR by current rectifying and wave filtering circuit connection inverse-excitation type switch power-supply PWM chip IC 1, output rectifier and filter is connected across the two ends of one of high frequency transformer TR secondary winding; It is characterized in that: described voltage stabilizing circuit is made up of pressurizer, flow restricter and photoelectrical coupler, connect into the voltage stabilizing flow-limiting passage by pressurizer, flow restricter and be connected across the positive voltage output end of current rectifying and wave filtering circuit and the positive input terminal of photoelectrical coupler, the negative input end ground connection of photoelectrical coupler, the output of photoelectrical coupler connect the feedback signal input of inverse-excitation type switch power-supply PWM chip IC 1.
2. a kind of voltage stabilizing loop of isolating reverse exciting switching voltage regulator according to claim 1, it is characterized in that: pressurizer is made of voltage stabilizing didoe ZD1, and flow restricter current-limiting resistance R2 constitutes, and photoelectrical coupler is made of optocoupler diode IC2; The positive pole of voltage stabilizing didoe ZD1 is connected with the end of current-limiting resistance R2, negative pole is connected with filter capacitor C3 is anodal, the other end of current-limiting resistance R2 links to each other with the 1st pin of optocoupler diode IC2, the 2nd pin of optocoupler diode IC2 links to each other with GND, the 3rd pin of optocoupler diode IC2 links to each other with the feedback input end FB pin of PWM integrated circuit (IC) 1, and the 4th pin of optocoupler diode IC2 meets high pressure ground SG.
3. a kind of voltage stabilizing loop of isolating reverse exciting switching voltage regulator according to claim 1, it is characterized in that: output rectifier and filter is made of rectifier diode D2 and filter capacitor C3, be connected across two ends of one of the secondary winding of high frequency transformer TR after rectifier diode D2 and the filter capacitor C3 series connection, the junction of rectifier diode D2 and filter capacitor C3 forms positive voltage output end, filter capacitor C3 minus earth GND and formation negative voltage output.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205679923U CN201854187U (en) | 2010-10-19 | 2010-10-19 | Voltage-stabilizing loop of isolation flyback switch power supply |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010205679923U CN201854187U (en) | 2010-10-19 | 2010-10-19 | Voltage-stabilizing loop of isolation flyback switch power supply |
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| CN201854187U true CN201854187U (en) | 2011-06-01 |
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| CN2010205679923U Expired - Fee Related CN201854187U (en) | 2010-10-19 | 2010-10-19 | Voltage-stabilizing loop of isolation flyback switch power supply |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102916420A (en) * | 2012-11-09 | 2013-02-06 | 深圳市安科讯实业有限公司 | Circuit for preventing PWM chip from error protection |
| CN103219880A (en) * | 2012-01-18 | 2013-07-24 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Transformer circuit provided with voltage feedback circuit with improved starting performance |
| CN103607114A (en) * | 2013-11-23 | 2014-02-26 | 大连尚能科技发展有限公司 | Special power source of wind power converter control system |
| CN104185333A (en) * | 2013-05-20 | 2014-12-03 | 海洋王（东莞）照明科技有限公司 | Constant-current constant-voltage circuit and illuminating device |
| CN108712089A (en) * | 2018-06-07 | 2018-10-26 | 当阳市宏焱科教仪器有限公司 | A kind of AC conversion circuit based on experiment instruments used for education |
| CN108964226A (en) * | 2018-10-10 | 2018-12-07 | 大连海思琪科技有限公司 | A kind of charging module and the charging unit containing the charging module |
| CN109188065A (en) * | 2018-09-28 | 2019-01-11 | 青岛海尔洗衣机有限公司 | Inverse-excitation type switch power-supply and its input voltage detection circuit, detection method is isolated |
| CN109256967A (en) * | 2018-10-26 | 2019-01-22 | 佛山市华全电气照明有限公司 | The constant voltage power supply circuit that power stability exports when a kind of starting |
| CN112783254A (en) * | 2020-12-23 | 2021-05-11 | 南京交通职业技术学院 | Auxiliary voltage source capable of automatically adjusting output and suitable for building safety |
| CN113114211A (en) * | 2021-04-26 | 2021-07-13 | 石家庄通合电子科技股份有限公司 | Voltage-frequency conversion circuit and sensor |
| CN106921303B (en) * | 2017-03-13 | 2023-08-11 | 深圳市安姆伯科技有限公司 | Switching power supply transformer |
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2010
- 2010-10-19 CN CN2010205679923U patent/CN201854187U/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103219880A (en) * | 2012-01-18 | 2013-07-24 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Transformer circuit provided with voltage feedback circuit with improved starting performance |
| CN103219880B (en) * | 2012-01-18 | 2015-07-08 | 伊顿制造（格拉斯哥）有限合伙莫尔日分支机构 | Transformer circuit provided with voltage feedback circuit with improved starting performance |
| CN102916420A (en) * | 2012-11-09 | 2013-02-06 | 深圳市安科讯实业有限公司 | Circuit for preventing PWM chip from error protection |
| CN104185333A (en) * | 2013-05-20 | 2014-12-03 | 海洋王（东莞）照明科技有限公司 | Constant-current constant-voltage circuit and illuminating device |
| CN104185333B (en) * | 2013-05-20 | 2016-09-28 | 海洋王（东莞）照明科技有限公司 | Constant-current constant-voltage circuit and illuminator |
| CN103607114A (en) * | 2013-11-23 | 2014-02-26 | 大连尚能科技发展有限公司 | Special power source of wind power converter control system |
| CN106921303B (en) * | 2017-03-13 | 2023-08-11 | 深圳市安姆伯科技有限公司 | Switching power supply transformer |
| CN108712089A (en) * | 2018-06-07 | 2018-10-26 | 当阳市宏焱科教仪器有限公司 | A kind of AC conversion circuit based on experiment instruments used for education |
| CN109188065A (en) * | 2018-09-28 | 2019-01-11 | 青岛海尔洗衣机有限公司 | Inverse-excitation type switch power-supply and its input voltage detection circuit, detection method is isolated |
| CN108964226A (en) * | 2018-10-10 | 2018-12-07 | 大连海思琪科技有限公司 | A kind of charging module and the charging unit containing the charging module |
| CN109256967A (en) * | 2018-10-26 | 2019-01-22 | 佛山市华全电气照明有限公司 | The constant voltage power supply circuit that power stability exports when a kind of starting |
| CN109256967B (en) * | 2018-10-26 | 2024-03-19 | 佛山市华全电气照明有限公司 | Constant voltage power supply circuit for stable power output during starting |
| CN112783254A (en) * | 2020-12-23 | 2021-05-11 | 南京交通职业技术学院 | Auxiliary voltage source capable of automatically adjusting output and suitable for building safety |
| CN113114211A (en) * | 2021-04-26 | 2021-07-13 | 石家庄通合电子科技股份有限公司 | Voltage-frequency conversion circuit and sensor |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: GUANGDONG REAL-DESIGN INTELLIGENT TECHNOLOGY CO., Free format text: FORMER NAME: FOSHAN SHUNDE REALDESIGN ELECTRONICS INDUSTRY CO., LTD. |
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| CP03 | Change of name, title or address |
Address after: 528300 Shunde, Guangdong, Daliang Industrial Park, Fengxiang, Xiang Xiang Road, No. 1 Patentee after: GUANGDONG REAL-DESIGN INTELLIGENT TECHNOLOGY CO., LTD. Address before: 528300 Guangdong province Foshan city Shunde District Daliang Industrial Park Fengxiang Huaye Road No. 1 Patentee before: Foshan Shunde Realdesign Electronics Industry Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110601 Termination date: 20151019 |
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| EXPY | Termination of patent right or utility model |