Chained single bridge self-coupling boost topology

Abstract

The invention relates to a chained single bridge self-coupling boost topology circuit, comprising a power switch MOS Q1, a power switch MOS Q2, two capacitors C2 and C3, a no-coupling high frequency chain positive boost transformer B, a secondary full bridge rectification circuit D1, D2, D3, and D4, an output filtering inductor L, and an output filtering capacitor C4. The capacitors C2 and C3 and the MOS Q1 and Q2 form a half bridge. When C2=C3, and one switch MOS is conducted, the voltage of the transformer B is only half of the voltage of a power supply. The technology reduces the size of a positive boost power supply by 75%, doubles the output power, increases the efficiency by 10%, and realizes the efficiency as high as 96%.

Description

technical field [0001] The invention relates to a chain-type single-bridge self-coupling boost topology circuit. Background technique [0002] At present, there are BOOST booster circuits and flyback-based booster circuit topologies commonly used in forward boost switching power supply circuits at home and abroad. [0003] The main circuit diagram of the BOOST boost circuit is as follows: figure 1 As shown, its working principle is: the input power stores the energy in the energy storage inductance L through the on and off of the power switch tube Q and superimposes it with the input voltage, and then transfers it to the output capacitor C through the isolation diode D to complete the boosting process. [0004] The main circuit diagram of the boost topology based on flyback is as follows: figure 2 As shown, when the switch tube Q is turned on, the primary coil of the transformer B stores energy, and when the switch tube is turned off, the primary energy storage is coupled...

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the defects of low output power, large volume, low efficiency and low reliability of the forward step-up DC converter in the prior art, and provide a chain-type single-bridge self-coupling booster Voltage topology conversion circuit, which realizes the positive step-up power supply under the same power and electrical parameters requirements, the volume is reduced by 50%, the output power is doubled, the efficiency is increased by 10%, and the highest efficiency can reach 96%.

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