Power supply circuit and power supply method

A technology of power supply circuit and power supply voltage, applied in the direction of electrical components, conversion equipment without intermediate conversion to AC, output power conversion device, etc., can solve the problem of low power supply efficiency, achieve high charging efficiency, and reduce total harmonics , The effect of low residual voltage

Active Publication Date: 2020-11-10
JOULWATT TECH INC LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a high-efficiency power supply circuit and power supply method to solve the technical problem of low power supply efficiency in the prior art

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  • Power supply circuit and power supply method

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Embodiment Construction

[0025] 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 within the spirit and scope of the present invention.

[0026] 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.

[0027] In the following paragraphs the invention is described more specifically by way of example with reference to the accompanying drawings. It should be noted that all the drawings are in a relatively simplified form and use inaccurate scales to facilitate and clearly assist the purpose of illustrating the embodiments of the prese...

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Abstract

According to a power supply circuit and a power supply method provided by the present invention, an input voltage charges a first capacitor, and the voltage of the first capacitor is a power supply; when the input voltage drops to a first threshold value, the first capacitor is charged; when the voltage of the first capacitor rises to a second threshold value, or when the input voltage rises to athird threshold value, the charging of the first capacitor is cut off; and the first threshold value is adjusted according to the input voltage when the charging of the first capacitor is cut off, oraccording to the capacitor voltage when the first capacitor begins to be charged, or according to the capacitor voltage when the charging of the first capacitor is cut off, so that the power supply circuit works in the highest efficiency state. According to the present invention, the power supply efficiency is high, and the circuit structure is simple.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a power supply circuit and a power supply method. Background technique [0002] The schematic diagram of the traditional high-voltage power supply scheme is as follows: figure 1 As shown in the figure, the power supply to the Flybuck circuit is taken as an example in the figure. In the figure, the MOS transistor Q1 is pulled up by the pull-up resistor R1, and the input voltage Vin and the supply voltage V1 of the auxiliary winding jointly charge the capacitor C1, and the voltage VCC on the capacitor C1 reaches VZ1 When -Vth, the charging ends, and the voltage VCC is maintained at VZ1-Vth, VZ1 is the voltage on the Zener transistor Z1, and Vth is the turn-on voltage of the MOS transistor Q1. If the auxiliary winding supply voltage V1 is higher than VZ1-Vth, the MOS transistor Q1 can be turned off. However, considering that VCC is basically higher than the output voltage V1 of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00H02M3/06H02M3/07H02M1/14
CPCH02M1/00H02M3/06H02M3/07H02M1/14H02M1/0006H02M1/0025Y02B70/10
Inventor 不公告发明人
Owner JOULWATT TECH INC LTD
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