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Power supply circuit of switch power supply and power supply method thereof

A switching power supply and power supply circuit technology, applied in electrical components, adjusting electrical variables, output power conversion devices, etc., can solve the problem of many peripheral devices in the controller, and achieve self-power supply, simplify peripheral circuits, and reduce losses. Effect

Active Publication Date: 2015-08-12
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this circuit still needs the resistor R1 to supply power to the switch tube S1 at start-up, and the diode D1 to supply power to the control unit after start-up, so that there are many peripheral components of the controller

Method used

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  • Power supply circuit of switch power supply and power supply method thereof
  • Power supply circuit of switch power supply and power supply method thereof
  • Power supply circuit of switch power supply and power supply method thereof

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Embodiment Construction

[0054] 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.

[0055] refer to Figure 4 Shown is a power supply circuit of a switching power supply according to the present invention. The switching power supply is an example of a flyback switching power supply. The switching power supply includes a rectifier bridge (not shown) connected in sequence, an inductive element (including A transformer com...

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Abstract

The present invention discloses a power supply circuit of a switch power supply and a power supply method thereof. Through setting a power switch tube as a depletion type transistor, when a circuit is started, DC input voltage is used to charge a charging capacitor through the power switch tube such that the voltage rises to the starting voltage of a control chip. When the circuit works normally, through controlling the switch action of the power switch tube and a first switch tube, the charging voltage signal of the charging capacitor is maintained to the expected working value of the control chip. Compared with the prior art, the additional high voltage starting resistor and high starting transistor are not needed, the loss is greatly reduced, the self power supply can be realized, the power supply of a winding, a diode and other components is not needed, a peripheral circuit can be simplified, and the cost is reduced.

Description

technical field [0001] The present invention relates to the field of power supply, and more specifically, relates to a power supply circuit and a power supply method of a switching power supply. Background technique [0002] In switching power supplies, the commonly used main power switching tube is an N-channel enhancement transistor. When the circuit is started, a high-voltage start-up resistor or other start-up circuit is required to supply power to the control unit, and when the circuit starts to work normally, it needs to be assisted by a transformer. Winding or output to supply power to the control unit. [0003] The following takes the flyback switching power supply controlled by the primary side as an example to illustrate. The traditional flyback switching power supply controlled by the primary side is as follows: figure 1 As shown, among them, U1 is the primary side control unit; S1 is an N-channel enhancement transistor as the main power switch tube; R1 is a high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M1/36H02M3/335
CPCH02M3/33507H02M1/36
Inventor 张少斌胡志亮白永江金津
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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