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Single-stage PFC converter post-stage ripple elimination circuit

A ripple elimination and converter technology, applied in the direction of converting DC power input to DC power output, instruments, electrical components, etc., can solve the problems of high cost, complex circuit, lower efficiency of the whole machine, etc. The efficiency of the whole machine, the effect of reducing the working voltage and converting the power

Pending Publication Date: 2020-07-28
张朝辉
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main disadvantage of the two-stage conversion topology scheme is that ① the circuit is complex
② The efficiency of the whole machine is reduced
③Higher cost

Method used

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  • Single-stage PFC converter post-stage ripple elimination circuit
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  • Single-stage PFC converter post-stage ripple elimination circuit

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Embodiment Construction

[0023] Hereinafter, the present invention will be described and analyzed in detail with preferred embodiments in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of them.

[0024] One more point, the descriptions of "first", "second" and "third" involved in the present invention are only used for indicative purposes, and cannot be understood as expressing their relative importance or implicitly specifying technical features. Quantity.

[0025] 1. Preferred embodiment of the present invention

[0026] Such as figure 1 , figure 2 As shown, the rear-stage ripple elimination circuit of a single-stage PFC converter is composed of a single-stage PFC converter (1), a DC-DC converter (2), filter capacitors (C1, C2, C3) and output capacitors (Co) . The single-stage PFC converter (1) has three sets of outputs or two sets of outputs, which are connected to a common ground or a common ano...

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Abstract

The invention designs a single-stage PFC converter post-stage ripple elimination circuit. The single-stage PFC converter post-stage ripple elimination circuit is composed of a single-stage PFC converter (1), a DC-DC converter (2), a filter capacitor and an output capacitor. The single-stage PFC converter (1) has three or two groups of outputs. When the single-stage PFC converter (1) has three groups of outputs, voltage difference between the first group of output and the second group of output is used as the input of the DC-DC converter (2), and the output of the DC-DC converter (2) is superposed with the third group of output. The AC component output by the DC-DC converter (2) is controlled to just offset second harmonic waves of the third group of output, so ripple-free DC output is obtained. When the power of the whole machine is small, the third group of output of the single-stage PFC converter (1) can be removed, and the working voltage of the DC-DC converter (2) is not changed, so the output is ripple-free direct current. The circuit has the advantages that the working voltage and conversion power of the DC-DC converter (2) are remarkably reduced, a low-voltage power device can be adopted, efficiency is improved, and cost is reduced. The circuit of the invention is a novel technical scheme of single-stage PFC&DC conversion, and can be widely applied to a high-power-factorswitching power supply.

Description

Technical field [0001] The invention relates to a single-stage PFC converter rear-stage ripple elimination circuit, which is a switching power supply technology and belongs to the technical field of power electronics. Background technique [0002] At present, there are two types of technical solutions for isolated AC-DC converters with high power factor, one is a single-stage conversion topology, and the other is a two-stage conversion topology. [0003] Single-stage conversion topologies mainly include single-stage PFC (Power factor Correction) converters such as flyback and bridge, as well as combined single-stage conversion composed of PFC conversion and DC-DC conversion (shared a set of switching tubes and control circuits) Device. The single-stage PFC converter is characterized by high power factor, but the DC output terminal contains second harmonic ripple. The characteristic of the combined single-stage converter is that the ripple at the DC output end and the power factor...

Claims

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Application Information

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IPC IPC(8): H02M1/14H02M1/42H02M3/158H02M3/155
CPCH02M1/14H02M1/4208H02M3/155H02M3/158H02M1/0048Y02B70/10
Inventor 张朝辉
Owner 张朝辉