CN104917366A - Quasi-resonant Boost soft start circuit - Google Patents
Quasi-resonant Boost soft start circuit Download PDFInfo
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- CN104917366A CN104917366A CN201510348191.5A CN201510348191A CN104917366A CN 104917366 A CN104917366 A CN 104917366A CN 201510348191 A CN201510348191 A CN 201510348191A CN 104917366 A CN104917366 A CN 104917366A
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Abstract
The present invention provides a quasi-resonant Boost soft start circuit. The circuit comprises an input voltage interface, a working power supply Vcc, a boost circuit, a quasi-resonant control chip, an output voltage detection feedback circuit, a soft start circuit and an output circuit. The input voltage interface is connected with the boost circuit; the output voltage detection feedback circuit is electrically connected with the boost circuit and the output circuit respectively; the quasi-resonant control chip and the soft start circuit are both connected with the working power supply Vcc; the output voltage detection feedback circuit is provided with a detection feedback end; the soft start circuit is provided with a soft start end; the quasi-resonant control chip is provided with a feedback pin; and the detection feedback end of the output voltage detection feedback circuit, the soft start end of the soft start circuit and the feedback pin of the quasi-resonant control chip are connected together. According to the quasi-resonant Boost soft start circuit provided by the present invention, the soft start circuit is added to a quasi-resonant mode boost PFC, so that the overshoot and inductance saturation problems of an electrolytic capacitor are perfectly solved.
Description
Technical field
The present invention relates to a kind of quasi-resonance Boost circuit, refer in particular to a kind of quasi-resonance Boost soft starting circuit.
Background technology
The mode of operation of current quasi-resonance Boost PFC requires that it controls to adopt variable frequency control, when the electric current of rectifier diode drops to 0 time, make main switch open-minded, when electric current reaches certain value time, main switch turns off, this work characteristics makes it not have the same soft start function of other PWM control IC (PWM mode IC reaches the function of soft by controlling duty ratio), and the control quasi-resonance control IC of main flow does not have soft starting circuit controlling functions yet at present, cause occurring following problem during start: 1. due to without soft circuit, during start, there is very large overshoot in output voltage, cause exporting electrochemical capacitor stress to exceed standard, particularly under cryogenic, the capacity of electrochemical capacitor significantly reduces, electrochemical capacitor has very large inefficacy hidden danger, make in actual product design, input voltage 90-305Vac, output voltage generally designs about 440, but the general electrochemical capacitor of existing market is 450V, during start, more than 500V can be reached, there is very large hidden danger, use 500V electric capacity cost high, cycle of getting the raw materials ready is long, performance is also not as good as 450V electrolysis, 2., during start, there is very large electric current in boost inductance.
Summary of the invention
Soft start controlling functions and the easily saturated problem of circuit element is not had in order to solve quasi-resonance Boost PFC work, the present invention proposes a kind of quasi-resonance Boost soft starting circuit, with the addition of soft starting circuit, can be applicable to accurate humorous pattern boost PFC, perfect overshoot and the inductance saturation problem solving electrochemical capacitor.
The technical solution adopted in the present invention is: a kind of quasi-resonance Boost soft starting circuit, comprise input voltage interface, working power Vcc, boost booster circuit, quasi-resonance control chip, output voltage detects feedback circuit, soft starting circuit and output circuit, input voltage interface connects boost booster circuit, output voltage detect feedback circuit respectively with boost booster circuit, output circuit is electrically connected, quasi-resonance control chip, soft starting circuit all connects working power Vcc, output voltage detects feedback circuit and has detection feedback end, soft starting circuit has soft start end, quasi-resonance control chip has feedback pin, output voltage detects the detection feedback end of feedback circuit, the soft start end of soft starting circuit, the present invention that connects together of the feedback pin of quasi-resonance control chip can be applicable to accurate humorous pattern boost PFC, the Voltage Feedback pin of quasi-resonance control chip is made to have certain voltage during start, like this, overshoot voltage is less than the voltage of setting, by a period of time time delay, reduce applied voltage gradually, such output voltage rises to design point voltage gently, perfect overshoot and the inductance saturation problem solving electrochemical capacitor.
As preferably, described boost booster circuit comprises inductance L 1, diode D1 and field effect transistor Q1, input voltage interface has a end, b end, b holds ground connection, one end of described inductance L 1 connects a end of input voltage interface, the other end of inductance L 1, the drain electrode of field effect transistor Q1 connect the anode of diode D1, and the source electrode of field effect transistor Q1 connects the b end of input voltage interface, and the negative electrode of diode D1 connects output voltage and detects feedback circuit.
As preferably, described field effect transistor Q1 is n channel enhancement type field effect transistor, is connected with diode between the source electrode of field effect transistor Q1, drain electrode.
As preferably, described output voltage detects feedback circuit and comprises resistance unit, resistance R4 and electric capacity C3, one end of one end of resistance unit, one end of resistance R4, electric capacity C3 connects the soft start end of the feedback pin of quasi-resonance control chip, soft starting circuit respectively, the other end of resistance R4, the other end ground connection of electric capacity C3, the other end of resistance unit connects the negative electrode of diode D1.
As further preferred, described resistance unit is formed by several resistant series.
As preferably, described output circuit includes the electric capacity C1 of polarity, the negative electrode of the cathode connecting diode D1 of electric capacity C1, the minus earth of electric capacity C1, and the voltage at electric capacity C1 two ends is output voltage.
As preferably, described soft starting circuit comprises resistance R6, resistance R7, electric capacity C2 and PNP type triode Q2, one end of resistance R6, one end of resistance R7 connect working power Vcc respectively, the other end of the emitter contact resistance R7 of PNP type triode Q2, the other end of the base stage difference contact resistance R6 of PNP type triode Q2, one end of resistance R5, one end of electric capacity C2, the other end of resistance R5, the other end ground connection of electric capacity C2, the current collection very soft start end of PNP type triode Q2.
The invention has the beneficial effects as follows: in the humorous pattern boost PFC of standard, add soft starting circuit, perfect overshoot and the inductance saturation problem solving electrochemical capacitor.
Accompanying drawing explanation
Fig. 1 is a kind of circuit diagram of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.
As shown in Figure 1, a kind of quasi-resonance Boost soft starting circuit, comprise input voltage interface, working power Vcc, boost booster circuit, quasi-resonance control chip, output voltage detects feedback circuit, soft starting circuit and output circuit, input voltage interface has a end, b holds, b holds ground connection, input voltage interface connects boost booster circuit, output voltage detect feedback circuit respectively with boost booster circuit, output circuit is electrically connected, quasi-resonance control chip, soft starting circuit all connects working power Vcc, output voltage detects feedback circuit and has detection feedback end, soft starting circuit has soft start end, quasi-resonance control chip has feedback pin, output voltage detects the detection feedback end of feedback circuit, the soft start end of soft starting circuit, the feedback pin of quasi-resonance control chip connects together.Input voltage Ui enters boost booster circuit by input voltage interface.
Boost booster circuit comprises inductance L 1, diode D1 and field effect transistor Q1, one end of described inductance L 1 connects a end of input voltage interface, the other end of inductance L 1, the drain electrode of field effect transistor Q1 connect the anode of diode D1, the source electrode of field effect transistor Q1 connects the b end of input voltage interface, and the negative electrode of diode D1 connects output voltage and detects feedback circuit.Wherein, field effect transistor Q1 is n channel enhancement type field effect transistor, is connected with diode between the source electrode of field effect transistor Q1, drain electrode.
Output voltage detects feedback circuit and comprises resistance unit, resistance R4 and electric capacity C3, one end of one end of resistance unit, one end of resistance R4, electric capacity C3 connects the soft start end of the feedback pin of quasi-resonance control chip, soft starting circuit respectively, the other end of resistance R4, the other end ground connection of electric capacity C3, the other end of resistance unit connects the negative electrode of diode D1.Wherein, resistance unit is in series by resistance R1, resistance R2 and resistance R3.
Output circuit includes the electric capacity C1 of polarity, the negative electrode of the cathode connecting diode D1 of electric capacity C1, the minus earth of electric capacity C1, and the voltage at electric capacity C1 two ends is output voltage Vo.
Quasi-resonance control chip U1 can adopt L6563S, and its pin 14 is for connecting working power Vcc, and pin 12 ground connection, pin 1 is as feedback pin.
Soft starting circuit comprises resistance R6, resistance R7, electric capacity C2 and PNP type triode Q2, one end of resistance R6, one end of resistance R7 connect working power Vcc respectively, the other end of the emitter contact resistance R7 of PNP type triode Q2, the other end of the base stage difference contact resistance R6 of PNP type triode Q2, one end of resistance R5, one end of electric capacity C2, the other end of resistance R5, the other end ground connection of electric capacity C2, the current collection very soft start end of PNP type triode Q2.
Working power Vcc has voltage to carry beginning, and quasi-resonance control chip U1 starts working, and the PNP type triode Q2 conducting simultaneously in soft starting circuit, injects certain electric current by PNP type triode Q2, and slowly subtract down to 0.Resistance R6 in soft starting circuit, resistance R5 and electric capacity C2 form delay circuit, and the resistance of resistance R7 determines the size just having started Injection Current.In start-up course, soft starting circuit can form certain voltage and slowly be reduced to 0 on soft start end FB, makes the uphill process of output voltage comparatively mild, there will not be transient overshoot, thus making start inductive current stress less, the problem that inductance is easily saturated is also resolved.
The core of soft starting circuit coordinates quasi-resonance mode of operation and feedback feature and additional soft start controlling functions, described quasi-resonance mode of operation is a kind of variable frequency control and PFM(Pulse Frequency Modulation, frequency modulation pattern), be characterized in switching tube in other words inductive current control switching tube (normal for MOSFET field effect transistor) when near zero-crossing point open-minded, and make it turn off when the electric current of switching tube reaches certain value by certain control mode.
Soft starting circuit when starting by changing the setting voltage of feedback circuit and the mode slowly changing to final set point reaches the function of soft start, realizing circuit has multiple, be not limited to boost circuit, the application such as boost pfc circuit, also comprise distortion or the derivative form of boost circuit, including but not limited to Buck, Buck-boost circuit, Flyback(flyback) isolated variable circuit etc., when these circuit adopt quasi-resonance mode of operation, also can apply above-mentioned soft starting circuit to reach output voltage and slowly rise and the target not causing the hidden danger such as electrochemical capacitor overvoltage and the saturated inefficacy of inductance.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within protection scope of the present invention.
Claims (9)
1. a quasi-resonance Boost soft starting circuit, it is characterized in that: comprise input voltage interface, working power Vcc, boost booster circuit, quasi-resonance control chip, output voltage detects feedback circuit, soft starting circuit and output circuit, input voltage interface connects boost booster circuit, output voltage detect feedback circuit respectively with boost booster circuit, output circuit is electrically connected, quasi-resonance control chip, soft starting circuit all connects working power Vcc, output voltage detects feedback circuit and has detection feedback end, soft starting circuit has soft start end, quasi-resonance control chip has feedback pin, output voltage detects the detection feedback end of feedback circuit, the soft start end of soft starting circuit, the feedback pin of quasi-resonance control chip connects together.
2. quasi-resonance Boost soft starting circuit according to claim 1, it is characterized in that: described boost booster circuit comprises inductance L 1, diode D1 and field effect transistor Q1, input voltage interface has a end, b end, b holds ground connection, one end of described inductance L 1 connects a end of input voltage interface, the other end of inductance L 1, the drain electrode of field effect transistor Q1 connect the anode of diode D1, the source electrode of field effect transistor Q1 connects the b end of input voltage interface, and the negative electrode of diode D1 connects output voltage and detects feedback circuit.
3. quasi-resonance Boost soft starting circuit according to claim 2, is characterized in that: described field effect transistor Q1 is n channel enhancement type field effect transistor, has parasitic diode or is circumscribed with diode between the source electrode of field effect transistor Q1, drain electrode.
4. quasi-resonance Boost soft starting circuit according to claim 2, is characterized in that: described diode D1 is the synchronous rectification form of single diode or multiple Diode series or parallel-connection structure or field effect transistor.
5. quasi-resonance Boost soft starting circuit according to claim 2, it is characterized in that: described output voltage detects feedback circuit and comprises resistance unit, resistance R4, one end of resistance unit, one end of resistance R4 connect the feedback pin of quasi-resonance control chip, the soft start end of soft starting circuit respectively, the other end ground connection of resistance R4, the other end of resistance unit connects the negative electrode of diode D1.
6. quasi-resonance Boost soft starting circuit according to claim 5, is characterized in that: described output voltage detects feedback circuit and also comprises electric capacity C3, and electric capacity C3 is connected in parallel on resistance R4 two ends.
7. quasi-resonance Boost soft starting circuit according to claim 5, is characterized in that: described resistance unit is formed by several resistant series.
8. quasi-resonance Boost soft starting circuit according to claim 1, it is characterized in that: described output circuit includes the electric capacity C1 of polarity, the negative electrode of the cathode connecting diode D1 of electric capacity C1, the minus earth of electric capacity C1, the voltage at electric capacity C1 two ends is output voltage.
9. the quasi-resonance Boost soft starting circuit according to claim 1 to 6 any one, it is characterized in that: described soft starting circuit comprises resistance R6, resistance R7, electric capacity C2 and PNP type triode Q2, one end of resistance R6, one end of resistance R7 connects working power Vcc respectively, the other end of the emitter contact resistance R7 of PNP type triode Q2, the other end of the base stage difference contact resistance R6 of PNP type triode Q2, one end of resistance R5, one end of electric capacity C2, the other end of resistance R5, the other end ground connection of electric capacity C2, the current collection very soft start end of PNP type triode Q2.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510348191.5A CN104917366A (en) | 2015-06-23 | 2015-06-23 | Quasi-resonant Boost soft start circuit |
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| CN201510348191.5A CN104917366A (en) | 2015-06-23 | 2015-06-23 | Quasi-resonant Boost soft start circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109217665A (en) * | 2018-10-25 | 2019-01-15 | 广州金升阳科技有限公司 | A kind of driving signal enhancing circuit |
| US10250146B2 (en) | 2016-10-14 | 2019-04-02 | Boe Technology Group Co., Ltd. | Soft-start power supply circuit, method for controlling the same, and display device |
| CN111725985A (en) * | 2020-07-11 | 2020-09-29 | 青岛鼎信通讯股份有限公司 | Soft start control circuit applied to electric power product |
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| CN104135146A (en) * | 2014-07-29 | 2014-11-05 | 广州金升阳科技有限公司 | Soft starting method and circuit |
| CN104168695A (en) * | 2014-07-23 | 2014-11-26 | 合肥荣事达三洋电器股份有限公司 | LED backlight circuit based on SEPIC topological work |
| CN104660073A (en) * | 2013-11-22 | 2015-05-27 | 罗姆股份有限公司 | Power Supply Control Circuit, Power Supply Device and Electronic Apparatus |
| CN204652212U (en) * | 2015-06-23 | 2015-09-16 | 杭州中恒派威电源有限公司 | Quasi-resonance Boost soft starting circuit |
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| CN2501243Y (en) * | 2001-09-24 | 2002-07-17 | 梁准强 | DC-DC mini boosted circuit |
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| CN1770610A (en) * | 2004-10-14 | 2006-05-10 | 夏普株式会社 | Switching power supply circuit and electronic apparatus provided therewith |
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| CN102098030A (en) * | 2009-12-09 | 2011-06-15 | 罗姆股份有限公司 | Semiconductor device and switching regulator using the device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10250146B2 (en) | 2016-10-14 | 2019-04-02 | Boe Technology Group Co., Ltd. | Soft-start power supply circuit, method for controlling the same, and display device |
| CN109217665A (en) * | 2018-10-25 | 2019-01-15 | 广州金升阳科技有限公司 | A kind of driving signal enhancing circuit |
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| CN111725985A (en) * | 2020-07-11 | 2020-09-29 | 青岛鼎信通讯股份有限公司 | Soft start control circuit applied to electric power product |
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