Front-rear bridge arm multiplexing high-efficiency full-bridge phase shifted converter
A full-bridge phase-shifting, front-rear bridge technology, applied in the field of soft switching converters, can solve the problems of voltage ringing, super-forearm and lagging arm can not be full load range, etc., to reduce conduction loss, improve efficiency, reduce The Effect of Switching Losses
Active Publication Date: 2017-01-04
HUNAN UNIV
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Problems solved by technology
[0007] The technical problem to be solved by the present invention is to provide a high-efficiency full-bridge phase-shifting converter with multiplexed front and rear bridge arms to solve the problem that the super-forearm and lagging arm cannot realize ZVS in the full load range in the prior art. Solve the problem of voltage ringing of the secondary rectifier diode, reduce voltage stress, and effectively reduce the main circuit circulation loss of the phase-shifted full-bridge power converter. It is suitable for charging equipment for large-capacity batteries and related occasions that require high output voltage.
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[0018] like figure 1 As shown, the present invention includes a full-bridge phase-shifting converter unit 1, a first half-bridge LLC resonant converter unit 2 sharing the super-forearm with the full-bridge phase-shifting converter, and a second half of the lagging arm shared with the full-bridge phase-shifting converter Bridge LLC resonant converter unit 3 . The power switching devices Q1-Q4 in the full-bridge phase-shifting conversion unit 1 constitute the four bridge arms of the full-bridge phase-shifting converter, D1-D4 are the body diodes of the power switching devices, and C1-C4 are connected in parallel to the collectors of the power switching devices (drain) and the absorbing capacitance between the emitter (source), where Q1, Q3 constitute the super forearm, Q2, Q4 constitute the lagging arm, C g is the DC blocking capacitor, T is the main power transformer, and L lk is the primary leakage inductance of transformer T, D O1 ~D O4 form the secondary full-bridge rect...
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The invention discloses a front-rear bridge arm multiplexing high-efficiency full-bridge phase shifted converter. The converter comprises a full-bridge phase shifted conversion unit, wherein the full-bridge phase shifted conversion unit comprises a heading arm consisting of a first power switch device and a third power switch device in serial connection, and a lag arm consisting of a second power switch device and a fourth power switch device in serial connection; the heading arm and the lag arm are connected in parallel; the heading arm and the lag arm are both connected with a full-bridge rectification module; the full-bridge phase shifted conversion unit and a first half-bridge LLC resonant converter share the heading arm; the full-bridge phase shifted conversion unit and a second half-bridge LLC resonant converter share the lag arm. Due to the adoption of the first half-bridge LLC resonant converter, ZVS of the heading arm is facilitated, meanwhile, the voltage stress of a secondary rectification diode of the full-bridge phase shifted converter is clamped in relatively small voltage, and the circular current of the full-bridge phase shifted converter in a continuous current period can be reduced, so that the phenomenon of duty cycle loss can be effectively reduced; the highest efficiency of the converter can be greater than 98%.
Description
technical field [0001] The invention relates to a soft-switching converter, in particular to a full-range soft-switching and high-efficiency full-bridge phase-shifting converter, which is suitable for high-power charging equipment. Background technique [0002] With the development of society, the application of energy storage battery power supply system is more and more extensive, such as electric vehicle energy storage battery power supply, island high-power backup energy storage battery power supply system, etc. In order to improve energy utilization, reduce carbon emissions, and improve economic benefits, the charging power supply equipment for charging these energy storage battery power systems should have the highest possible power conversion efficiency. [0003] Full-bridge phase-shift converters are widely used in high-power high-frequency switching power supply equipment. However, the traditional full-bridge phase-shift converter has shortcomings such as narrow swi...
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Login to View More IPC IPC(8): H02M3/335
CPCH02M3/3353H02M1/0058Y02B70/10
Inventor 戴瑜兴赵振兴罗安周乐明陈燕东徐千鸣周小平何志兴伍文华
Owner HUNAN UNIV