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Double-switch voltage reduction type direct current-direct current switching circuit

A DC conversion and step-down technology, applied in the direction of DC power input conversion to DC power output, high-efficiency power electronic conversion, output power conversion device, etc., can solve the problems of low input power factor, large current distortion, etc., to improve The effect of power factor

Inactive Publication Date: 2013-07-31
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, compared with the Boost PFC circuit, the input power factor is low and the current distortion is large

Method used

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  • Double-switch voltage reduction type direct current-direct current switching circuit
  • Double-switch voltage reduction type direct current-direct current switching circuit
  • Double-switch voltage reduction type direct current-direct current switching circuit

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Embodiment Construction

[0029] The present invention will be described in detail below in conjunction with the accompanying drawings. The features and details of the present invention can be more easily understood by describing specific embodiments of the present invention. Known implementations and operating means are not described in detail herein so as not to confuse the various technical implementations of the present invention. However, for those skilled in the art, the lack of one or more specific details or components does not affect the understanding of the present invention. understand and implement.

[0030] The "embodiment" or "an embodiment" described in this specification refers to the specific features, structures, implementation methods and characteristics included in at least one embodiment of the present invention described in conjunction with the embodiment. Therefore, when "in one embodiment" is mentioned in different places in the specification, they do not necessarily refer to t...

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Abstract

The invention relates to an alternating current-direct current power supply changing circuit, and aims at providing a double-switch voltage reduction type direct current-direct current switching circuit. The switching circuit comprises an output capacitor Co, an inductor L, a diode D1, a first switch tube S1 and a second switch tube S2, wherein the switching circuit is connected with a direct current input; a positive end of the direct current input is connected with one end of the inductor L, and a cathode of the diode D1; the other end of the inductor L is connected with one end of the second switch tube S2, and one end of the output capacitor Co; the other end of the output capacitor Co is connected with an anode of the diode D1, and one end of the first switch tube S1; the other ends of the second switch tube S2 and the first switch tube S1 are connected with a negative end of the direct current input; and direct current outputs are arranged at the two ends of the output capacitor Co, and connected with a load. With the adoption of the switching circuit, the continuous alternating current input current can be realized on the basis of maintaining low direct current output voltage, and a power factor of the alternating current input current can be increased greatly.

Description

technical field [0001] The invention relates to an AC-DC power conversion circuit, in particular to a double-switch step-down DC-DC conversion circuit. Background technique [0002] AC-DC conversion is one of the most basic forms of electrical energy conversion. In order to reduce the harmonic pollution to the power grid, high power factor (PFC) rectification is one of the must-have functions in AC-DC conversion. Therefore, the front stage of AC-DC conversion usually requires a high power factor (PFC) rectifier circuit, also known as PFC converter or PFC current, to meet the regulations on current harmonics in different applications. In a PFC circuit, the ideal input current waveform is to completely follow the sinusoidal AC input voltage without phase difference and distortion, that is, the power factor is 1 and the harmonic distortion (THD) is 0. [0003] The most commonly used PFC circuit is the traditional Boost PFC circuit, such as figure 1 shown. It includes an inp...

Claims

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Application Information

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IPC IPC(8): H02M3/155H02M1/42
CPCY02B70/126Y02B70/10Y02P80/10
Inventor 张军明
Owner ZHEJIANG UNIV
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