Secondary side series LCD excitation energy transfer forward converter capable of suppressing output energy backflow
A forward converter and energy transfer technology, which is applied in the direction of output power conversion device, high-efficiency power electronic conversion, DC power input conversion to DC power output, etc., can solve the problem of affecting the working mode of forward excitation inductor and the low utilization rate of excitation energy , complex circuit composition and other issues, to achieve the effect of eliminating reverse recovery problems, improving utilization, and high overall efficiency
Active Publication Date: 2020-09-18
XIAN UNIV OF SCI & TECH
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Problems solved by technology
[0007] The technical problem to be solved by the present invention is to provide a secondary side series LCD excitation energy transfer forward converter capable of suppressing the reverse flow of output energy in order to solve the problem of low utilization rate of excitation energy in the existing magnetic reset circuit. The circuit composition is complex, the loss is large, the efficiency is low, and the problem that the existing secondary side reset affects the working mode of the forward inductor
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[0040] Such as figure 1As shown, the secondary side series LCD excitation energy transfer forward converter capable of suppressing output energy backflow of the present invention, a secondary side series LCD excitation energy transfer forward converter capable of suppressing output energy backflow includes a forward converter main circuit 1, and an energy transfer and transmission circuit 2 connected to the main circuit of the forward converter 1; wherein, the main circuit 1 of the forward converter includes a high-frequency transformer T, a switch tube S, a diode D1, a diode D2, an inductor L1 and Capacitor C1, the terminal with the same name on the primary side of the high-frequency transformer T is the positive voltage input terminal IN+ of the main circuit 1 of the forward converter and is connected to the positive output terminal of the external power supply, the terminal with the same name on the primary side of the high-frequency transformer T Connected to the drain of ...
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The invention discloses a secondary side series LCD excitation energy transfer forward converter capable of suppressing output energy backflow. The forward converter comprises a forward converter maincircuit and an energy transfer and transmission circuit connected with the forward converter main circuit, wherein 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 a capacitor C1; and the energy transfer and transmission circuit comprises a diode D3, a capacitor C2, a diode D4 and an inductor L2. The forward converter is simple in circuit structure and high in reliability, the diode D4 ensures that energy at the output end does not flow back, and reactive power loss of the converter is reduced; excitation energy can be transferred to a load side, so that the energy transmission efficiency is improved; in addition, soft turn-off or soft turn-on of the switching tube can be realized, the reverse recovery problem of the diode is eliminated, the loss of the switching tube and the diode is further reduced, and the overall efficiency is improved.
Description
technical field [0001] The invention belongs to the technical field of switching power supplies, and in particular relates to a secondary-side serial LCD excitation energy transfer forward converter capable of suppressing backflow of output energy. Background technique [0002] Isolated switching power supplies include: flyback converters, half-bridge / full-bridge converters and forward converters. Compared with flyback converters, the power of forward converters is not limited by the ability of the transformer to store energy; For half-bridge, full-bridge converters, and forward converters, they use fewer components, simpler circuits, lower costs, and higher reliability. [0003] 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. However, f...
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Patent Timeline
Login to View More IPC IPC(8): H02M3/335
CPCH02M3/33523H02M1/0038H02M1/0051H02M1/0058H02M3/33538Y02B70/10
Inventor 刘树林安博琛刘旭王文强吴星严纪志
Owner XIAN UNIV OF SCI & TECH