CN201805349U - Switch power voltage-stabilizing circuit with soft start function - Google Patents
Switch power voltage-stabilizing circuit with soft start function Download PDFInfo
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- CN201805349U CN201805349U CN201020538521XU CN201020538521U CN201805349U CN 201805349 U CN201805349 U CN 201805349U CN 201020538521X U CN201020538521X U CN 201020538521XU CN 201020538521 U CN201020538521 U CN 201020538521U CN 201805349 U CN201805349 U CN 201805349U
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Abstract
The utility model relates to the technical filed of switch powers, in particular to a switch power voltage-stabilizing circuit with a soft start function, which comprises a voltage-stabilizing unit and a photoelectrical coupling unit, and also comprises a soft start circuit, wherein the soft start circuit comprises diodes D1 and D2 and a capacitor C1, the cathode of the diode D1 is connected with the input end of the photoelectrical coupling unit, the anode of the diode D1 is connected with the cathode of the diode D2 and the anode of the capacitor C1, the anode of the diode D2 is connected with the output end of the photoelectrical coupling unit, and the cathode of the capacitor C1 is grounded. When in the instant of the starting, the utility model can control the feedback of the photoelectrical coupling unit through charging the capacitor C1, the pulse width of the wave shape output by the pulse-width modulation (PWM) drive chip of the forestage of the switch power gradually becomes from small to big, so that the output voltage of the switch power can be prevent from overshooting during the instant of the starting.
Description
Technical field
The utility model relates to the switch power technology field, relates in particular to a kind of Switching Power Supply voltage stabilizing circuit with soft start function.
Background technology
In Switching Power Supply, in order to keep output voltage stabilization, general Switching Power Supply all is provided with the voltage stabilizing circuit that is used for regulated output voltage.
The voltage stabilizing circuit of Switching Power Supply of the prior art, it mainly is made up of voltage regulation unit and photoelectricity coupling unit, the effect of voltage regulation unit is after Switching Power Supply starts, keep the stable of output voltage by sampling to output voltage, the effect of photoelectricity coupling unit is the PWM chip for driving that the ERROR CONTROL amount of output voltage is fed back to the Switching Power Supply prime, by PWM chip for driving output drive waveforms switching tube is carried out control corresponding.But, because the voltage stabilizing circuit of this Switching Power Supply does not have soft start function, starting shooting moment, the photoelectricity coupling unit can be that zero situation feeds back to the PWM chip for driving faithfully with output voltage, the drive waveforms that causes the very big pulsewidth of PWM chip for driving output, so that enough driving energy to be provided, and then the situation (being overshoot) of overtension appears in the output voltage that causes Switching Power Supply in the moment of starting shooting, output voltage is too high not only can to make shorten the useful life of electronic devices and components such as output filter capacitor, switching tube, even can damage load.
Summary of the invention
The purpose of this utility model is to provide a kind of Switching Power Supply voltage stabilizing circuit with soft start function at the deficiencies in the prior art, and its feedback by control photoelectricity coupling unit prevents that the output voltage of Switching Power Supply is at the start overshoot.
The purpose of this utility model realizes by following technical measures: a kind of Switching Power Supply voltage stabilizing circuit with soft start function, it includes voltage regulation unit, photoelectricity coupling unit, the input of the input of voltage regulation unit and photoelectricity coupling unit all is connected with the output voltage of Switching Power Supply, the output of voltage regulation unit is connected with the output of photoelectricity coupling unit, the comparative voltage end of voltage regulation unit is connected with the control end of photoelectricity coupling unit, also comprise soft starting circuit, described soft starting circuit comprises diode D1, D2, capacitor C 1; The negative pole of diode D1 is connected with the input of photoelectricity coupling unit, and the positive pole of diode D1 is connected with the negative pole of diode D2, the positive pole of capacitor C 1, and the positive pole of diode D2 is connected with the output of photoelectricity coupling unit, the minus earth of capacitor C 1.
Described voltage regulation unit comprises resistance R 4, R5, R6, voltage stabilizing chip U1; Resistance R 6 one ends are the input of voltage regulation unit, resistance R 6 other ends are the comparative voltage end of voltage regulation unit, the negative electrode of voltage stabilizing chip U1 is the output of voltage regulation unit, the reference utmost point of voltage stabilizing chip U1 is connected with the comparative voltage end of resistance R 4 one ends, resistance R 5 one ends, voltage regulation unit, the anode of voltage stabilizing chip U1, resistance R 4 other ends, the equal ground connection of resistance R 5 other ends.
The model of described voltage stabilizing chip U1 is TL431.
Described photoelectricity coupling unit comprises resistance R 1, R2, R3, capacitor C 2, C3, photoelectrical coupler PC1B; Resistance R 1 one ends are the input of photoelectricity coupling unit, resistance R 3 one ends are the control end of photoelectricity coupling unit, the 2nd pin of photoelectrical coupler PC1B is the output of photoelectricity coupling unit, resistance R 1 other end is connected with the 1st pin, resistance R 2 one ends of photoelectrical coupler PC1B, resistance R 2 other ends are connected with output, capacitor C 2 one ends, capacitor C 3 one ends of photoelectricity coupling unit, capacitor C 2 other ends are connected with resistance R 3 other ends, and capacitor C 3 other ends are connected with the control end of photoelectricity coupling unit.
The model of described photoelectrical coupler PC1B is PC817.
The utility model beneficial effect is: the utility model includes voltage regulation unit, photoelectricity coupling unit, the input of the input of voltage regulation unit and photoelectricity coupling unit all is connected with the output voltage of Switching Power Supply, the output of voltage regulation unit is connected with the output of photoelectricity coupling unit, the comparative voltage end of voltage regulation unit is connected with the control end of photoelectricity coupling unit, also comprise soft starting circuit, described soft starting circuit comprises diode D1, D2, capacitor C 1; The negative pole of diode D1 is connected with the input of photoelectricity coupling unit, and the positive pole of diode D1 is connected with the negative pole of diode D2, the positive pole of capacitor C 1, and the positive pole of diode D2 is connected with the output of photoelectricity coupling unit, the minus earth of capacitor C 1.Starting shooting moment, the utility model can be by controlling the feedback of photoelectricity coupling unit to the charging of capacitor C 1, thereby make the pulsewidth of the PWM chip for driving output drive waveforms of Switching Power Supply prime become big gradually, reach the output voltage that prevents Switching Power Supply purpose at the start overshoot by little.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is the connection diagram of the utility model and PWM chip for driving.
In Fig. 1, Fig. 2, comprise:
11---voltage regulation unit 12---photoelectricity coupling unit
13---soft starting circuit 14---PWM chip for driving.
Embodiment
Below in conjunction with accompanying drawing the utility model is further described, as shown in Figure 1, a kind of Switching Power Supply voltage stabilizing circuit that the utility model provides with soft start function, it includes voltage regulation unit 11, photoelectricity coupling unit 12, the input of the input of voltage regulation unit 11 and photoelectricity coupling unit 12 all is connected with the output voltage (Vout) of Switching Power Supply, the output of voltage regulation unit 11 is connected with the output of photoelectricity coupling unit 12, the comparative voltage end of voltage regulation unit 11 is connected with the control end of photoelectricity coupling unit 12, the utility model also comprises soft starting circuit 13, described soft starting circuit 13 comprises diode D1, D2, capacitor C 1; The negative pole of diode D1 is connected with the input of photoelectricity coupling unit 12, the positive pole of diode D1 is connected with the negative pole of diode D2, the positive pole of capacitor C 1, the positive pole of diode D2 is connected with the output of photoelectricity coupling unit 12, the minus earth of capacitor C 1 (GND).
Wherein, the model of voltage stabilizing chip U1 is TL431; The model of photoelectrical coupler PC1B is PC817.Certainly, the model and the parameter of above-mentioned electronic devices and components are only for reference, and when specifically implementing the technical program, its model and parameter value can be made amendment according to actual environment.
Operation principle of the present utility model is as follows: as shown in Figure 2, be connected the photoelectrical coupler PC1A of the 2nd pin of the PWM chip for driving 14 of Switching Power Supply prime, light-receiving device part for photoelectrical coupler PC1, the 6th pin of PWM chip for driving 14 is used to export drive waveforms, and switching tube of switch power supply secondary etc. is carried out control corresponding.When beginning to switch on, Switching Power Supply (starts shooting moment), output voltage begins to rise, because capacitor C 1 voltage at this moment is zero, then output voltage is by resistance R 1, photoelectrical coupler PC1B, diode D2 begins to capacitor C 1 charging, because the conducting voltage of diode D2 is fixed, so, the voltage of photoelectrical coupler PC1B the 2nd pin is lived by institute's stored voltage clamp on the capacitor C 1, make electric current by photoelectrical coupler PC1B by diminishing greatly gradually, and can directly influence the pulsewidth that PWM chip for driving 14 is exported drive waveforms by photoelectrical coupler PC1A by the size of photoelectrical coupler PC1B electric current, be that photoelectrical coupler PC1B becomes big by the pulsewidth that the electric current that diminishes gradually greatly makes the 6th pin of PWM chip for driving 14 export drive waveforms gradually by little, this drive waveforms is carried out control corresponding to switching tube of switch power supply secondary etc., make the output voltage of Switching Power Supply become big gradually by little, prevent overshoot, realize the soft start of Switching Power Supply.
After the voltage on the capacitor C 1 reached certain value, the clamping action of capacitor C 1 began to discharge, and at this moment, the output voltage of Switching Power Supply begins normal output, and voltage regulation unit 11 and photoelectricity coupling unit 12 also begin normal work, the output voltage stabilization of maintained switch power supply.
When shutdown, (as 24V) reduces gradually because of output voltage, and then charge stored begins to discharge rapidly to load by diode D1 on the capacitor C 1, to guarantee also can to realize soft start when starting shooting next time.
In sum, the utility model only need increase the soft starting circuit 13 of diode D1, D2, capacitor C 1 composition, utilize capacitor C 1 can not suddenly change the voltage of clamp photoelectrical coupler PC1B at start its voltage of moment, just realized the soft start of Switching Power Supply, soft starting circuit 13 is simple in structure, and soft start is effective.
Should be noted that at last; above embodiment is only in order to the explanation the technical solution of the utility model; but not to the restriction of the utility model protection range; although the utility model has been done to explain with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can make amendment or be equal to replacement the technical solution of the utility model, and not break away from the essence and the scope of technical solutions of the utility model.
Claims (5)
1. Switching Power Supply voltage stabilizing circuit with soft start function, it includes voltage regulation unit, photoelectricity coupling unit, the input of the input of voltage regulation unit and photoelectricity coupling unit all is connected with the output voltage of Switching Power Supply, the output of voltage regulation unit is connected with the output of photoelectricity coupling unit, the comparative voltage end of voltage regulation unit is connected with the control end of photoelectricity coupling unit, it is characterized in that: also comprise soft starting circuit, described soft starting circuit comprises diode D1, D2, capacitor C 1; The negative pole of diode D1 is connected with the input of photoelectricity coupling unit, and the positive pole of diode D1 is connected with the negative pole of diode D2, the positive pole of capacitor C 1, and the positive pole of diode D2 is connected with the output of photoelectricity coupling unit, the minus earth of capacitor C 1.
2. the Switching Power Supply voltage stabilizing circuit with soft start function according to claim 1, it is characterized in that: described voltage regulation unit comprises resistance R 4, R5, R6, voltage stabilizing chip U1; Resistance R 6 one ends are the input of voltage regulation unit, resistance R 6 other ends are the comparative voltage end of voltage regulation unit, the negative electrode of voltage stabilizing chip U1 is the output of voltage regulation unit, the reference utmost point of voltage stabilizing chip U1 is connected with the comparative voltage end of resistance R 4 one ends, resistance R 5 one ends, voltage regulation unit, the anode of voltage stabilizing chip U1, resistance R 4 other ends, the equal ground connection of resistance R 5 other ends.
3. the Switching Power Supply voltage stabilizing circuit with soft start function according to claim 2 is characterized in that: the model of described voltage stabilizing chip U1 is TL431.
4. the Switching Power Supply voltage stabilizing circuit with soft start function according to claim 1 is characterized in that: described photoelectricity coupling unit comprises resistance R 1, R2, R3, capacitor C 2, C3, photoelectrical coupler PC1B; Resistance R 1 one ends are the input of photoelectricity coupling unit, resistance R 3 one ends are the control end of photoelectricity coupling unit, the 2nd pin of photoelectrical coupler PC1B is the output of photoelectricity coupling unit, resistance R 1 other end is connected with the 1st pin, resistance R 2 one ends of photoelectrical coupler PC1B, resistance R 2 other ends are connected with output, capacitor C 2 one ends, capacitor C 3 one ends of photoelectricity coupling unit, capacitor C 2 other ends are connected with resistance R 3 other ends, and capacitor C 3 other ends are connected with the control end of photoelectricity coupling unit.
5. the Switching Power Supply voltage stabilizing circuit with soft start function according to claim 4 is characterized in that: the model of described photoelectrical coupler PC1B is PC817.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020538521XU CN201805349U (en) | 2010-09-21 | 2010-09-21 | Switch power voltage-stabilizing circuit with soft start function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201020538521XU CN201805349U (en) | 2010-09-21 | 2010-09-21 | Switch power voltage-stabilizing circuit with soft start function |
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| Publication Number | Publication Date |
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| CN201805349U true CN201805349U (en) | 2011-04-20 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201020538521XU Expired - Fee Related CN201805349U (en) | 2010-09-21 | 2010-09-21 | Switch power voltage-stabilizing circuit with soft start function |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103677048A (en) * | 2013-12-03 | 2014-03-26 | 京东方科技集团股份有限公司 | Drive circuit and electronic device |
| CN106329902A (en) * | 2016-09-18 | 2017-01-11 | 深圳市华星光电技术有限公司 | Voltage output buffer circuit, power supply circuit and display device |
| CN109067166A (en) * | 2018-09-19 | 2018-12-21 | 西安微电子技术研究所 | A kind of Discrete control soft starting circuit of DC/DC converter |
| CN110113845A (en) * | 2019-06-06 | 2019-08-09 | 湖南凯上电子科技有限公司 | A kind of LED illumination power supply eyeshield SS (soft start) control circuit |
-
2010
- 2010-09-21 CN CN201020538521XU patent/CN201805349U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103677048A (en) * | 2013-12-03 | 2014-03-26 | 京东方科技集团股份有限公司 | Drive circuit and electronic device |
| CN106329902A (en) * | 2016-09-18 | 2017-01-11 | 深圳市华星光电技术有限公司 | Voltage output buffer circuit, power supply circuit and display device |
| CN109067166A (en) * | 2018-09-19 | 2018-12-21 | 西安微电子技术研究所 | A kind of Discrete control soft starting circuit of DC/DC converter |
| CN110113845A (en) * | 2019-06-06 | 2019-08-09 | 湖南凯上电子科技有限公司 | A kind of LED illumination power supply eyeshield SS (soft start) control circuit |
| CN110113845B (en) * | 2019-06-06 | 2024-03-22 | 湖南凯上电子科技有限公司 | Eye protection soft start control circuit of LED illumination power supply |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110420 Termination date: 20150921 |
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| EXPY | Termination of patent right or utility model |