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Pseudo continuous conductive Buck-Boost bridgeless PFC converter

A technology of pseudo-continuous conduction and converter, applied in high-efficiency power electronic conversion, conversion of AC power input to DC power output, electrical components, etc., can solve the problems of limited output power range, input current distortion, difficult high efficiency, etc., to achieve Improve the dynamic response speed, the circuit structure is simple, and the effect is easy to realize

Active Publication Date: 2018-10-19
SOUTH CHINA UNIV OF TECH
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  • Description
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Problems solved by technology

[0002] The Boost PFC converter operating in the inductor current continuous mode has poor dynamic response to load changes, and the input current is severely distorted near the zero-crossing point of the input voltage when the load is light; the Boost PFC converter switch tube operating in the inductor current discontinuous mode The current stress is relatively large, which limits its output power range, making it only suitable for low power applications
In addition, for the 90-265V AC input voltage RMS range, it is necessary to increase the design margin of the Boost PFC converter, which makes it difficult to achieve high efficiency in a wide input voltage range

Method used

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  • Pseudo continuous conductive Buck-Boost bridgeless PFC converter
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  • Pseudo continuous conductive Buck-Boost bridgeless PFC converter

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Embodiment Construction

[0011] Specific embodiments of the present invention are described below in conjunction with the accompanying drawings, but the implementation of the present invention is not limited thereto. It should be pointed out that if there are symbols or processes that are not specifically described in detail below, those skilled in the art can refer to the prior art realized or understood.

[0012] The basic topology and control block diagram of this example are as follows: figure 1 As shown, the pseudo continuous conduction mode Buck-Boost bridgeless PFC converter includes an AC power supply, a first diode VD 1 , the second diode VD 2 , the third diode VD 3 , the first switch tube S 1 , the second switch tube S 2 , inductance L 1 , output filter capacitor C O and load. One end of the AC power supply and the first diode VD 1 anode and the first switching tube S 1 Emitter connection; the other end of the AC power supply and the second diode VD 2 anode and the second switching...

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Abstract

The invention provides a pseudo continuous conductive Buck-Boost bridgeless PFC converter, comprising an AC power source, a first diode, a second diode, a third diode, a first switching tube, a secondswitching tube, an inductor, an output filter capacitor and a load. One end of the AC power source Vin is connected to the anode of the first diode and the emitter of the first switching tube. The other end of AC power source Vin is connected to the anode of the second diode and the emitter of the second switching tube. The cathode of the first diode is connected to the cathode of the second diode, one end of the inductor and one end of the output filter capacitor. The other end of the inductor is connected to the anode of the third diode, the collector of the first switching tube, and the collector of the second switching tube. The cathode of the third diode is connected to the other end of the output filter capacitor. The load is connected in parallel with the filter capacitor. The pseudo continuous conductive Buck-Boost bridgeless PFC converter is capable of correcting a power factor within a wide voltage input range and has high efficiency.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a pseudo-continuous conduction mode Buck-Boost bridgeless PFC converter. Background technique [0002] The Boost PFC converter operating in the inductor current continuous mode has poor dynamic response to load changes, and the input current is severely distorted near the zero-crossing point of the input voltage when the load is light; the Boost PFC converter switch tube operating in the inductor current discontinuous mode The current stress is relatively large, which limits its output power range, making it only suitable for low-power applications. In addition, for the effective value range of 90-265V AC input voltage, it is necessary to increase the design margin of the Boost PFC converter, which makes it difficult to obtain higher efficiency in a wide input voltage range. Therefore, it is very valuable to study buck-boost PFC converters with fast dynamic response sp...

Claims

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Application Information

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IPC IPC(8): H02M7/217H02M1/42
CPCH02M1/4208H02M7/217Y02B70/10
Inventor 肖文勋胡建雨张波
Owner SOUTH CHINA UNIV OF TECH
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