CN103795232A - Quasi resonant flyback power supply and high voltage starting circuit thereof - Google Patents
Quasi resonant flyback power supply and high voltage starting circuit thereof Download PDFInfo
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- CN103795232A CN103795232A CN201310629172.0A CN201310629172A CN103795232A CN 103795232 A CN103795232 A CN 103795232A CN 201310629172 A CN201310629172 A CN 201310629172A CN 103795232 A CN103795232 A CN 103795232A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention relates to a quasi resonant flyback power supply and a high voltage starting circuit thereof. The high voltage starting circuit of the quasi resonant flyback power supply comprises a bidirectional TVS tube, a quasi resonant controller and a charging capacitor. According to the quasi resonant flyback power supply and the high voltage starting circuit thereof of the invention, current is started through constant high voltage so as to charge the charging capacitor of the quasi resonant controller, such that quick start of the quasi resonant controller can be realized; and the constant high voltage-started current can be cut off effectively after the start of the quasi resonant controller is realized, and therefore, the efficiency of the quasi resonant flyback power supply can be improved, and energy loss of a quasi resonant flyback power supply system when the quasi resonant flyback power supply is in a standby state can be decreased.
Description
Technical field
The present invention relates to power initiation field, be specifically related to a kind of high-voltage starting circuit of quasi-resonance flyback power supply.
Background technology
Constantly bringing forth new ideas of Present Global electronic product, small-power power has reached 70% left and right of global power supply, its overwhelming majority adopts flyback topology to design, the low fatal difficulty that has become design small power supply of flyback power-efficient, therefore there is quasi-resonance flyback power supply, can effectively raise efficiency, in the time of quasi-resonance flyback, power supply constantly brings forth new ideas and has occurred in high voltage situation start-up circuit restriction.For example after three of charger inputs exchange input rectifying, voltage is higher than 500V, and what on every charger, can not lack is exactly accessory power supply, therefore becomes vital link at the high-voltage starting circuit of quasi-resonance high-voltage starting circuit.
At present, a development that hinders quasi-resonance flyback power supply is exactly to be high-voltage starting circuit, conventionally adopt circuit dividing potential drop form to carry out power supply to start at high-voltage starting circuit, but when not turn-offing after quasi-resonance flyback power supply high voltage startup, cause the continuous consumed power of starting resistance, cause the whole efficiency of power module to reduce.
Summary of the invention
The object of this invention is to provide a kind of high-voltage starting circuit of universal quasi-resonance inverse-excitation type, can not turn-off for solving after existing high-voltage starting circuit starts, cause the continuous consumed power of starting resistance, cause the whole efficiency of power module to reduce.
Technology contents of the present invention is: a kind of high-voltage starting circuit of quasi-resonance flyback power supply, it is characterized in that, comprise two-way TVS pipe, quasi-resonance controller and charging capacitor, described two-way TVS pipe one end connects input direct-current bus, and the other end connects the high voltage startup end (HV) of quasi-resonance controller; Described charging capacitor one end connects the power input (VCC) of quasi-resonance controller and the auxiliary winding of flyback transformer, other end ground connection.
Described quasi-resonance controller is PWM chip IC E2QS03G.
A kind of quasi-resonance flyback power supply, comprises high-voltage starting circuit; Described high-voltage starting circuit comprises two-way TVS pipe, quasi-resonance controller and charging capacitor, and described two-way TVS pipe one end connects input direct-current bus, and the other end connects the high voltage input terminal HV of quasi-resonance controller; Described charging capacitor one end connects the power input (VCC) of quasi-resonance controller and the auxiliary winding of transformer, other end ground connection.
Described quasi-resonance controller is PWM chip IC E2QS03G.
Further, be also provided with feedback compensation circuit, described feedback compensation circuit one end connects flyback transformer output winding, and the other end connects quasi-resonance controller feedback compensation terminal (FB).
Further, be also provided with double-transistor flyback circuit.
Described double-transistor flyback circuit connects the gate drivers output (GATE) of described quasi-resonance controller by isolating transformer.
The present invention charges to the charging capacitor of quasi-resonance controller by constant high voltage startup electric current, thereby realize the quick startup of quasi-resonance controller, after realizing startup, quasi-resonance controller can effectively turn-off constant high voltage startup electric current, improve the efficiency of quasi-resonance flyback power supply, and in the time of the standby of quasi-resonance flyback power supply, reduced the energy loss of quasi-resonance flyback power supply system.High-voltage starting circuit of the present invention, cpable of lowering power loss, and circuit structure is simple.
Accompanying drawing explanation
Fig. 1 is high-voltage starting circuit figure of the present invention;
Fig. 2 is quasi-resonance flyback power supply specific embodiment schematic diagram of the present invention.
Specific embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Fig. 1 is high-voltage starting circuit figure of the present invention, comprises two-way TVS pipe, quasi-resonance controller and charging capacitor, and described two-way TVS pipe one end connects input direct-current bus, and the other end connects the high voltage startup end HV of quasi-resonance controller; Described charging capacitor one end connects the power input VCC of quasi-resonance controller and the auxiliary winding of flyback transformer, other end ground connection.When charging capacitor charging reaches after quasi-resonance control chip starting resistor; quasi-resonance control chip is started working; quasi-resonance control chip is started working; after starting working quasi-resonance flyback power supply, testing circuit turn-offs constant-current source; two-way TVS pipe does not have electric current to flow through, thus protection TVS pipe and other devices.
Fig. 2 is quasi-resonance flyback power supply specific embodiment schematic diagram of the present invention.Quasi-resonance controller adopts PWM chip IC E2QS03G.After 380VAC alternating current is by rectifying and wave-filtering, reach direct current 530VDC left and right, the maximum voltage that itself can bear due to quasi-resonance control chip is 500V, after voltage is higher than 500VDC, if to circuit, the startup that adds high pressure can not cause the damage of device, therefore when voltage reaches after 500VDC-750VDC, the two-way TVS pipe that it is 350V that input voltage bus need connect a cut-ff voltage, two-way TVS pipe is connected with the pin of the inner constant-current source of quasi-resonance controller, and the output of constant-current source is connected with charging capacitor.In the time that voltage exceedes 500VDC, two-way TVS manages conducting, and now voltage is clamped to 480VDC, and chip is not damaged.Utilize the principle of the transient absorption energy of TVS pipe, have in a short period of time certain electric current to flow through, with 1mA constant-current source, charging capacitor is charged.According to making start-up time by oneself,
select the capacity of charging capacitor; When charging capacitor charging reaches after quasi-resonance control chip starting resistor; quasi-resonance control chip is started working; after testing circuit is started working quasi-resonance flyback power supply, turn-off constant-current source, two-way TVS pipe does not have electric current to flow through, thereby protects two-way TVS pipe and other devices.After quasi-resonance flyback power work, switching tube starts to open shutoff, in the time that switching tube turn-offs, by transformer, energy is passed to secondary major loop and auxiliary winding, auxiliary winding provides power supply simultaneously for charging capacitor charges for chip, in the time that switching tube is opened, transformer primary side storage power, now maintains for the voltage of quasi-resonance control chip work is discharged by charging capacitor, so circulation, thereby remove the loss of high voltage startup part, improved efficiency and stability.
Beneficial effect of the present invention also comprises and has improved high voltage startup scope, has solved the defect of chip high voltage startup between 500V-750V; Improve the efficiency of complete machine, the power consumption when having reduced common flyback power supply and quasi-resonance flyback power supply use resistance starting in the time of 500V-750V; The reliability that improves quasi-resonance flyback power supply high-voltage starting circuit makes to input ripple burr when large, and two-way TVS pipe can absorb its burr; Voltage makes two-way TVS pipe end not conducting during lower than 350V, thereby can solve the input undervoltage defencive function of quasi-resonance flyback power supply.
Claims (7)
1. the high-voltage starting circuit of a quasi-resonance flyback power supply, it is characterized in that, comprise two-way TVS pipe, quasi-resonance controller and charging capacitor, described two-way TVS pipe one end connects input direct-current bus, and the other end connects the high voltage startup end (HV) of quasi-resonance controller; Described charging capacitor one end connects the power input (VCC) of quasi-resonance controller and the auxiliary winding of flyback transformer, other end ground connection.
2. the high-voltage starting circuit of a kind of quasi-resonance flyback power supply according to claim 1, is characterized in that, described quasi-resonance controller is PWM chip IC E2QS03G.
3. a quasi-resonance flyback power supply, is characterized in that, comprises high-voltage starting circuit; Described high-voltage starting circuit comprises two-way TVS pipe, quasi-resonance controller and charging capacitor, and described two-way TVS pipe one end connects input direct-current bus, and the other end connects the high voltage input terminal (HV) of quasi-resonance controller; Described charging capacitor one end connects the power input (VCC) of quasi-resonance controller and the auxiliary winding of transformer, other end ground connection.
4. a kind of quasi-resonance flyback power supply according to claim 3, is characterized in that, quasi-resonance controller is PWM chip IC E2QS03G.
5. according to a kind of quasi-resonance flyback power supply described in claim 3 or 4, it is characterized in that, also be provided with feedback compensation circuit, described feedback compensation circuit one end connects flyback transformer output winding, and the other end connects quasi-resonance controller feedback compensation terminal (FB).
6. according to a kind of quasi-resonance flyback power supply described in claim 3 or 4 or 5, it is characterized in that, described quasi-resonance flyback power supply is two-tube quasi-resonance flyback power supply.
7. according to a kind of quasi-resonance flyback power supply described in claim 3 or 4 or 5 or 6, it is characterized in that, the gate drivers output (GATE) of described quasi-resonance controller connects described switching tube by isolating transformer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310629172.0A CN103795232A (en) | 2013-11-30 | 2013-11-30 | Quasi resonant flyback power supply and high voltage starting circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310629172.0A CN103795232A (en) | 2013-11-30 | 2013-11-30 | Quasi resonant flyback power supply and high voltage starting circuit thereof |
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| CN103795232A true CN103795232A (en) | 2014-05-14 |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11135290A (en) * | 1997-10-28 | 1999-05-21 | Matsushita Electric Works Ltd | Lighting device for discharge lamp |
| CN200956551Y (en) * | 2006-09-27 | 2007-10-03 | 尼克森微电子股份有限公司 | Quasi-resonant control circuit for power supply system |
| CN201414084Y (en) * | 2009-03-31 | 2010-02-24 | 深圳市安邦信电子有限公司 | Switch power supply based on quasi-resonance |
| CN201839208U (en) * | 2010-10-20 | 2011-05-18 | 苟迎娟 | PFC/PWM two-in-one switching power supply circuit |
| JP4873370B2 (en) * | 2007-04-17 | 2012-02-08 | 岩崎電気株式会社 | High pressure discharge lamp lighting device |
| CN202282885U (en) * | 2011-03-30 | 2012-06-20 | 浙江大学宁波理工学院 | LED road lamp driving power supply |
| CN203027133U (en) * | 2012-12-17 | 2013-06-26 | 宁波新尚智能电气有限公司 | Starting circuit based on quasi-resonance controller |
-
2013
- 2013-11-30 CN CN201310629172.0A patent/CN103795232A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11135290A (en) * | 1997-10-28 | 1999-05-21 | Matsushita Electric Works Ltd | Lighting device for discharge lamp |
| CN200956551Y (en) * | 2006-09-27 | 2007-10-03 | 尼克森微电子股份有限公司 | Quasi-resonant control circuit for power supply system |
| JP4873370B2 (en) * | 2007-04-17 | 2012-02-08 | 岩崎電気株式会社 | High pressure discharge lamp lighting device |
| CN201414084Y (en) * | 2009-03-31 | 2010-02-24 | 深圳市安邦信电子有限公司 | Switch power supply based on quasi-resonance |
| CN201839208U (en) * | 2010-10-20 | 2011-05-18 | 苟迎娟 | PFC/PWM two-in-one switching power supply circuit |
| CN202282885U (en) * | 2011-03-30 | 2012-06-20 | 浙江大学宁波理工学院 | LED road lamp driving power supply |
| CN203027133U (en) * | 2012-12-17 | 2013-06-26 | 宁波新尚智能电气有限公司 | Starting circuit based on quasi-resonance controller |
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Application publication date: 20140514 |