Dual Crystal Forward Active Clamp Switching Power Supply

A clamping switch and clamping capacitor technology, which is applied in the field of dual-crystal forward active clamping switching power supplies, can solve the problems of low core utilization, power and efficiency limitation, damage, etc., and achieve the improvement of core utilization, The effect of voltage stress reduction and volume reduction
CN101325375BInactive Publication Date: 2012-02-01DONGGUAN YIHENG ELECTRONICS
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Patents(China)
Current Assignee / Owner
DONGGUAN YIHENG ELECTRONICS
Publication Date
2012-02-01
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

A dual crystal forward active clamp switching power supply of the present invention includes a primary part, a transformer and a secondary part, wherein the primary part includes a first main switching tube, a clamping switching tube, a clamping capacitor and a second main switching tube, The D pole of the second main switching tube is connected to the input power supply, the S pole is connected to the same-named end of the primary winding of the transformer, the D pole of the first main switching tube is connected to the different-named end of the transformer primary winding, and the S pole is connected to the input One end of the clamping capacitor is connected to the same-named terminal of the transformer, the other end is connected to the D pole of the clamping switch tube, and the S pole of the clamping switch tube is connected to the different-named terminal of the transformer.
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Description

technical field

[0001] The invention relates to a switching power supply, in particular to a double crystal forward active clamping switching power supply. Background technique

[0002] Existing switching power supplies mainly include dual crystal forward and single crystal forward active clamp. Among them, the dual-crystal forward adopts a double-tube forward converter, which has a simple structure, low voltage stress of the switch tube, automatic reset of the magnetic core, and returns the energy of the leakage inductance to the input power supply, with high reliability, and can be used in high-voltage, medium-power, and high-power applications. Wide range of applications. However, it also has some disadvantages: the transformer is unidirectionally magnetized, the utilization rate of the magnetic core is low, and the volume is too large. At the same time, due to the reset of the magnetic core, its duty cycle cannot be greater than 0.5, and the frequency of the switch tube...

Claims

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