A Bridgeless Power Factor Correction Circuit Based on Resonant Switched Capacitor Converter
A technology of power factor correction and switched capacitors, which is applied in the direction of conversion equipment without intermediate conversion to AC, high-efficiency power electronic conversion, output power conversion devices, etc., and can solve problems such as converter efficiency limitations
Active Publication Date: 2021-09-14
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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[0003] Aiming at the above-mentioned deficiencies in the prior art, a bridgeless power factor correction circuit based on a resonant switched capacitor converter provided by the present invention solves the problem of limited converter efficiency in the prior art
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[0036] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.
[0037] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.
[0038] Such as figure 1 As shown, a bridgeless power factor correction circuit based on a resonant switched capacitor converter is characterized in that it includes an AC voltage source V AC and input filter inductor L 1 ;
[0039] The AC voltage source V AC One end of the input filter inductor ...
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The invention discloses a bridgeless power factor correction circuit based on a resonant switched capacitor converter, which belongs to the field of power electronics. By switching the connection relationship of the circuit in the positive and negative half cycles of the power frequency input voltage, the input side of the traditional converter is cancelled. The rectifier bridge helps to improve the energy conversion efficiency. The control of the present invention is not complicated, and it only needs to apply corresponding complementary switching signals to the two high-frequency switching tubes, and apply a switching signal tracking the input voltage to the power frequency switching tubes. The invention solves the problem of converter efficiency and power density limitation by realizing the zero-current switch of the switch tube, and cancels the rectifier bridge in the structure, which can further improve the efficiency of the converter.
Description
technical field [0001] The invention belongs to the field of power electronics, and in particular relates to a bridgeless power factor correction circuit based on a resonant switched capacitor converter. Background technique [0002] With the development of consumer electronics and portable devices, people put forward higher requirements on the efficiency of power adapters. In order to avoid bringing a large amount of current harmonics to the power grid when the equipment is connected to the power grid, the PFC circuit is often used as the front-end circuit in the power adapter. Usually, the PFC circuit is constructed by PWM converters such as Buck, Boost, Buck-Boost, etc. However, this type of converter is not conducive to improving the efficiency of the adapter due to its hard switching characteristics, and the existence of large inductance also greatly limits the power density. improvement. At the same time, because of its simple structure and convenient control, the br...
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IPC IPC(8): H02M1/42H02M3/07
CPCH02M1/4241H02M3/07Y02B70/10
Inventor 陈章勇韩雨伯刘翔宇吴云峰冯晨晨
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA