Synchronous rectifying interlocking circuit
A technology of synchronous rectification and interlocking circuit, which is applied in the direction of electrical components, AC power input conversion to DC power output, output power conversion device, etc. It can solve the problems of damaged MOSFET, large loss, high voltage peak, etc., and avoid common problems Effect
Active Publication Date: 2017-06-13
GUANGZHOU SHIYUAN ELECTRONICS CO LTD
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Problems solved by technology
However, there is a problem in the scheme of the above-mentioned synchronous rectification circuit: due to the delay of the circuit and the oscillation of the voltage sampling waveforms of the first rectification input terminal and the second rectification input terminal, the drive of the two dedicated power MOSFETs of the above-mentioned circuit may be high. The level or both of them are low, causing the two dedicated power MOSFETs to share, resulting in excessive voltage spikes, excessive losses, and even damage to the MOSFETs
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[0079] In the first embodiment, if Figure 5 as shown, Figure 5 It is a structural schematic diagram of an embodiment of the first drive module 103 of the synchronous rectification interlock circuit provided by the present invention; the first drive module 103 also includes a first triode Q1, a second triode Q2, a third triode Electrode Q3 and the fourth triode Q4;
[0080] The emitter of the first triode Q1 is connected to the driving detection terminal of the first driving module 103, the collector of the first triode Q1 is connected to the base of the first triode Q1, The power input end of the first driving module 103 is connected to the base of the first triode Q1, and the power input end of the first driving module 103 is also connected to the collector of the second triode Q2 , the emitter of the second triode Q2 is connected to the ground, and the base of the second triode Q2 is connected to the base of the first triode Q1;
[0081] The base of the third transistor...
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The invention discloses a synchronous rectifying interlocking circuit. The synchronous rectifying interlocking circuit comprises a first interlocking module and a second interlocking module, wherein the first interlocking module is used for detecting the level of a first control output end of a first driving module which is used for driving a first rectifying module of the synchronous rectifying loop to work, and is used for controlling the level of a second control output end of a second driving module for driving a second rectifying module of the synchronous rectifying loop to be different from the level of the first control output end according to the level of the first control output end; the second interlocking module is used for detecting the level of the second control output end, and controlling the level of the first control output end to be different from the level of the second output end according to the level of the second control output end. The synchronous rectifying interlocking circuit has the advantage that by controlling the two driving modules of the synchronous rectifying circuit to realize different levels of the rectifying modules, the condition of two MOSFETs (metal-oxide-semiconductor field effect transistor) in the synchronous rectifying loop being common is avoided.
Description
technical field [0001] The invention relates to the technical field of synchronous rectification, in particular to a synchronous rectification circuit with interlock. Background technique [0002] The synchronous rectification circuit generally uses a special power MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor, MOSFET, Metal-Oxide Semiconductor Field Effect Transistor) with extremely low on-state resistance to replace the rectifier diode to reduce rectification loss. technology. [0003] Such as figure 1 As shown, since the power transmitted by the primary side of the transformer of the synchronous rectification circuit is alternating current, the secondary side as the rectification output includes the first rectification module and the second rectification module, the first rectification module is controlled by the first drive module, the second rectification module The rectification module is controlled by the second drive module. The secondary side includes ...
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IPC IPC(8): H02M7/217
CPCH02M7/2173
Inventor 温益军
Owner GUANGZHOU SHIYUAN ELECTRONICS CO LTD