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Source electrode drive circuit and controlling method thereof

A technology of source drive and control method, which is applied in the direction of control/regulation system, electrical components, electronic switches, etc., can solve the problem of prolonging power consumption during the disconnection process of the main switch tube, so as to avoid delay and reduce additional power consumption , The effect of slowing down the rate of voltage change

Active Publication Date: 2015-03-11
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adjustment resistor with a large resistance value prolongs the turn-off process of the main switch and generates additional power dissipation

Method used

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  • Source electrode drive circuit and controlling method thereof
  • Source electrode drive circuit and controlling method thereof
  • Source electrode drive circuit and controlling method thereof

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Embodiment Construction

[0034] 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 within the spirit and scope of the present invention.

[0035] 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.

[0036] figure 1It is a schematic block diagram of a BUCK converter using a source drive method. The BUCK converter includes an input terminal Vin and an output terminal Vout, which are respectively used for receiving, for example, a rectified input voltage and supplying power to a load RL. The main switching tube Q1, the in...

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Abstract

The invention discloses a source electrode drive circuit and a controlling method thereof. The source electrode drive circuit comprises controlling transistors, a power supply capacitor and a current feed diode, wherein the controlling transistor are connected between the second end of a main switch pipe and the ground; the two ends of the power supply capacitor receive approximately constant bias voltage; the cathode of the current feed diode is connected to the control end of the main switch pipe; the anode of the current feed diode is connected with the second end of the main switch pipe; the controlling transistors are conducted and switched out periodically to enable the main switch pipe to be conducted and switched out correspondingly along the controlling transistors; the conducting time quantum of the main switch pipe comprises a first stage from starting in switching out state to completely conducting, and a second stage of being in completely conducting state; in the first stage, the controlling transistors provide approximately constant starting current. The source electrode drive circuit prolongs the conducting time of the main switch pipe, so as to restrain EMI greatly; meanwhile, time delay in switching out process of the main switch pipe is avoided, so as to reduce additional power consumption.

Description

technical field [0001] The present invention relates to a power converter, and more particularly, to a source drive circuit for a power converter and a control method thereof. Background technique [0002] The source driving method is widely used in various types of power converters due to its low power consumption and high efficiency. The working principle of the source driving mode is that the gate voltage of the main switching tube is fixed at a certain value, and the source voltage of the main switching tube is changed through the source driving circuit to control the switching state of the main switching tube. [0003] In the source drive circuit, the control transistor is cascaded with the main switch. For example, the drain of the control transistor is connected to the source of the main switching transistor, and the source of the control transistor is connected to the ground. The gate of the control transistor receives a PWM signal to be turned on and off periodica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/08H02M3/156H02M3/335
CPCH02M1/088H02M3/155H02M3/335H02M1/0054H02M3/158H03K17/602H03K17/6871Y02B70/10
Inventor 邓建刘国家
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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