Double-tube flyback switching power supply with clamp protection
A technology of clamping protection and switching power supply, which is applied in the direction of electrical components, regulating electric variables, and output power conversion devices, and can solve problems such as damage
Pending Publication Date: 2019-08-16
ZHEJIANG WELLSUN INTELLIGENT TECH CO LTD
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Problems solved by technology
[0005] The purpose of the present invention is to provide a dual-tube flyback switching power supply with clamp protection, the first switch tube and the second switch tube are connected in series, and the second switch tube follows the first switch tube to conduct synchronous conduction or cut-off. The two ends of the second switching tube are connected in parallel with a switching tube protection circuit, which is used to turn off the drain and source of the second switching tube when the second switching tube is turned on after the first switching tube is turned on. The voltage between them is limited within the safe working voltage range, aiming to solve the problem of excessive voltage that may be caused by the second switch following the conduction of the first switch in the switching power supply when the first switch is turned on. damage problem
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[0024] Such as figure 2 As shown, a dual-tube flyback switching power supply with clamp protection includes: first switch tube Q1, second switch tube Q2, switch tube protection circuit 4, clamp protection circuit 2, resistor R1, Zener diode Z1, control circuit 5, high frequency transformer T1, absorption circuit 1, output rectification and filter circuit 3;
[0025] The switching tube protection circuit 4 is composed of a resistor R2 and a capacitor C3;
[0026] The clamp protection circuit 2 is composed of a transient suppression diode VR1;
[0027] Absorption circuit 1 is composed of diode D1 and transient suppression diode VR2;
[0028] The output rectification and filtering circuit 3 is composed of a diode D2, a capacitor C1, a capacitor C2, and an inductor L1;
[0029] The positive terminal Vin+ of the input terminal of a dual-tube flyback switching power supply with clamp protection is connected to the terminal with the same name of the primary coil winding N1 of the...
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The invention discloses a double-tube flyback switching power supply with clamp protection. The double-tube flyback switching power supply comprises a first switching tube, a second switching tube, aswitching tube protection circuit, a clamp protection circuit, a resistor, a voltage stabilizing diode, a control circuit, a high-frequency transformer, an absorbing circuit, and an output rectifyingand filtering circuit. The first switching tube is connected in series with the second switching tube, the second switching tube is synchronously turned on or off with the first switching tube, and two ends of the second switching tube are connected to the switching tube protection circuit in parallel. After the first switching tube is turned on, the voltage between a drain electrode and a sourceelectrode of the second switching tube is limited in a safe operation voltage range in the process that the second switching tube is turned on from turned off, and the invention aims to solve the problem that the switching power supply is damaged due to excessive voltage during the process of turning on the second switching tube after the first switching tube is turned on.
Description
technical field [0001] The invention relates to the technical field of power switches, in particular to a dual-tube flyback switching power supply with clamp protection. Background technique [0002] The single-tube flyback switching power supply has a simple structure and is suitable for low-power power supplies, but the voltage stress of the main switch tube of the single-tube flyback switching power supply is large, which limits the use of the single-tube flyback switching power supply in high-voltage applications . [0003] Such as figure 1 As shown, the invention patent "a switching power supply" with application number 201410724388.X provides a technical solution for a switching power supply, including: a first switching tube, a second switching tube, a clamp protection circuit, a resistor, and a Zener diode , control circuit, high-frequency transformer, absorbing circuit, output rectification and filter circuit, the first switching tube is connected in series with t...
Claims
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IPC IPC(8): H02M3/335H02M1/32
CPCH02M3/33569H02M1/32Y02B70/10
Inventor 陈德才章为昆李兆刚邬永强刘清俊江华平俞丹为汪向荣韩伟健
Owner ZHEJIANG WELLSUN INTELLIGENT TECH CO LTD