Secondary side parallel LCD forward converter capable of avoiding reverse charging of energy storage capacitor

Abstract

The invention discloses a secondary side parallel LCD forward converter capable of avoiding the reverse charging of an energy storage capacitor. The forward converter comprises a forward converter main circuit and an energy transfer and transmission circuit; the forward converter main circuit comprises a high-frequency transformer T, a switching tube S, a diode D1, a diode D2, an inductor L1 and acapacitor C1, and the energy transfer and transmission circuit comprises a diode D3, a capacitor C2, an inductor L2 and a diode D4. The forward converter is simple in circuit structure and high in reliability, the diode D4 ensures that C2 cannot be reversely charged, reactive power loss of the converter is reduced, the reverse recovery problem of the D4 can be eliminated, diode loss is reduced, excitation energy can be transferred to a load side, forward excitation energy can be transmitted, energy transmission efficiency is improved, and the circuit is suitable for high-power transmission.

Description

technical field [0001] The invention belongs to the technical field of switching power supplies, and in particular relates to a secondary parallel LCD forward converter capable of avoiding reverse charging of an energy storage capacitor. Background technique [0002] In many isolated switching power supply conversion topologies, compared with the flyback converter, the power of the forward converter is not limited by the ability of the transformer to store energy; compared with the half-bridge and full-bridge converters, the forward converter As far as it is concerned, it uses fewer components, simpler circuits, lower cost, and higher reliability. Therefore, due to its relatively simple structure, low cost, input and output isolation, and high operational reliability, the forward converter circuit is more suitable for applications in small and medium power conversion applications, and has received high attention from the industry. [0003] But for the single-transistor forw...

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Problems solved by technology

[0011] The technical problem to be solved by the present invention is to provide a secondary parallel LCD forward converter that can avoid reverse charging of the energy storage capacitor in view of the above-mentioned deficiencies in the prior art, so as to solve the problem of low excitation energy utilization rate of the existing magnetic reset circuit Problems such as complex circuit composition, large loss, and low efficiency

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