High-efficiency and low-loss AC/DC (Alternating Current/Direct Current) power supply circuit and control method thereof

A technology of AC-DC power supply and AC power supply, which is applied in the direction of high-efficiency power electronic conversion, control/regulation system, output power conversion device, etc. It can solve the problems of large resistance loss, waste of electric energy, and difficulty in reducing switching loss, etc., and achieve reduction Effects of bus voltage, low loss, and reduced switching loss

Active Publication Date: 2015-05-13
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of this, the object of the present invention is to provide a high-efficiency, low-loss AC-DC power supply circuit and its control method to solve the problems in the prior art that the loss of the sampling resistor is too large under the high-voltage bus and the switching loss is difficult to reduce under light load. Small enough to cause unnecessary waste of electric energy

Method used

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  • High-efficiency and low-loss AC/DC (Alternating Current/Direct Current) power supply circuit and control method thereof
  • High-efficiency and low-loss AC/DC (Alternating Current/Direct Current) power supply circuit and control method thereof
  • High-efficiency and low-loss AC/DC (Alternating Current/Direct Current) power supply circuit and control method thereof

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Embodiment Construction

[0033] Several preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, but the present invention is not limited to these embodiments. The present invention covers any alternatives, modifications, equivalent methods and schemes made on the spirit and scope of the present invention. In order to provide the public with a thorough understanding of the present invention, specific details are set forth in the following preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details.

[0034] refer to figure 2 , shows the circuit diagram of the first embodiment of an AC-DC power supply circuit according to the present invention; wherein the AC-DC power supply circuit rectifies the DC input voltage V of the AC power supply AC g It is converted into a DC signal V through the first-stage voltage conversion circuit and th...

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Abstract

Disclosed herein are high efficiency, low loss AC-DC power supply circuits, and associated control methods. In one embodiment, an AC-DC power supply circuit can include: (i) a rectifier configured to rectify an AC power supply to generate a DC input voltage; (ii) a first stage voltage converter configured to convert the DC input voltage to a first output voltage, and to convert a first control signal to a feedback signal that represents the first output voltage; and (iii) a second stage voltage converter configured to convert the first output voltage to a constant DC output signal, where the first control signal represents a duty cycle of the second stage voltage converter.

Description

technical field [0001] The invention relates to the field of switching power supplies, more specifically, to a high-efficiency, low-loss AC-DC power supply circuit and a control method thereof. Background technique [0002] The schematic block diagram of the traditional AC and DC power supply circuit is as follows: figure 1 As shown, the DC input voltage V obtained after the AC power supply is processed by the rectifier bridge and the filter capacitor g It is converted into a DC voltage output through a step-up circuit and a flyback converter in turn. Wherein the boost circuit has a power factor correction function, and its power factor correction control circuit receives the input voltage V g and the bus voltage V obtained by voltage sampling BUS To obtain the current reference, the current loop control circuit controls the switch tube Q according to the current reference and the sampled input current 1 The switching action to convert the DC input voltage to the bus vol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/335H02M1/42H02M1/00
CPCH02M1/4225H02M3/33523Y02B70/10Y02P80/10H02M1/0025H02M1/007H02M3/33507
Inventor 赵晨姚杰
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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