An interleaved parallel flyback led drive power supply and its pfm control circuit

A technology of LED driving and driving power, which is applied in the direction of electric lamp circuit layout, electric light source, control/regulation system, etc. It can solve the problems of large EMI of power supply, large switch stress, large current ripple, etc., and achieves increased conduction time, high The effect of power factor and operating frequency increase
CN103427656BInactive Publication Date: 2015-09-02JIANGSU UNIV
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
JIANGSU UNIV
Publication Date
2015-09-02
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

The invention discloses a staggered parallel flyback LED driving power supply and a PFM (pulse width modulation) control circuit thereof. A main circuit of the driving power supply is formed by staggering and parallel connection of two flyback converters, and comprises an alternating-current input end, an EMI (electromagnetic interference) filter, a bridge rectifier, the two parallel flyback converters, an output rectifier and an LED load. By the aid of the staggered parallel main circuit structure, current stress of switching tubes is reduced, input and output current ripple is reduced, the EMI filter design is simplified, power level of the driving power supply is increased, and the like. A PFM control method is adopted in the control circuit of the driving power supply; compared with a common PWM control method, the PFM control method has the advantages that by the aid of the PFM control circuit, the driving power supply can change in switching tube turning-on time and switching frequency simultaneously when the load changes, working loss during light load of the driving power supply is reduced, and power supply efficiency is improved. The driving power supply is suitable for applications of an LED driving power supply with an automatic dimming function.
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Description

technical field

[0001] The invention belongs to the technical field of power electronics applications, and in particular relates to an interleaved parallel flyback LED drive power supply and a PFM control circuit thereof, which are suitable for switching power supplies, especially in the application field of LED drive power supplies. Background technique

[0002] Switching power supply is an indispensable power electronic device in modern social life, and it has a very wide range of applications in the fields of electronics, communications, electricity, energy, lighting, aerospace, military and home appliances. With the further development of power electronics technology, the society has further increased the requirements for the volume, reliability, cost, energy saving and environmental protection of switching power supply. In recent years, with the maturity of LED lighting technology, LED driving power supply has become a research hotspot. More and more countries and organ...

Claims

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