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Drive circuit capable of quickly switching off depletion type switching element

A technology of depletion switches and switching devices, which is applied in the direction of instruments, electrical components, and adjustment of electrical variables, etc., to speed up the turn-on speed, ensure reliability, and solve the effects of fast turn-on and fast turn-off

Inactive Publication Date: 2010-07-28
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the prior art, and to provide a driving circuit that can quickly turn off the depletion-type switching device, aiming at solving the controllability of the depletion-type switching device and focusing on solving the problem of its rapid turn-off The second is to solve the fast turn-on of depletion-type switching devices and the safety and reliability of the drive circuit, so that depletion-type switching devices can be better used in switching power supplies and switching converters

Method used

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  • Drive circuit capable of quickly switching off depletion type switching element
  • Drive circuit capable of quickly switching off depletion type switching element
  • Drive circuit capable of quickly switching off depletion type switching element

Examples

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Embodiment 1

[0017] see figure 1 , the drive circuit consists of a P-channel enhanced switching device Q1 (hereinafter referred to as P-channel device) and an N-channel enhanced switching device Q2 (hereinafter referred to as N-channel device) and connected to the gates of the two switching devices Composed of resistors R1 and R2, the drain D of the P-channel device Q1 is connected to the drain D of the N-channel device Q2, and the source S of the P-channel device Q1 is directly connected to the power supply VCC of the driving circuit , the source S of the N-channel device Q2 is connected to the reference ground, the gate G of the P-channel device Q1 is connected to the drive control signal input terminal A through its gate resistor R1, and the gate of the N-channel device Q2 is connected through Its gate resistor R2 is connected to the drive control signal input terminal A, and the control signal input terminal A is connected to the signal output terminal of the external control drive cir...

Embodiment 2

[0021] see figure 2 In this example, on the basis of Embodiment 1, a diode D1 is connected in parallel on the gate resistor R1 of the P-channel enhanced switching device Q1, and the cathode of the diode D1 is connected to the gate of the P-channel enhanced switching device Q1. , the anode of which is connected to the input terminal A of the control signal, another diode D2 is connected in parallel on the gate resistor R2 of the N-channel enhanced switching device Q2, and the anode of the diode D2 is connected to the N-channel enhanced switching device Q2 The gate of the grid is connected, and its cathode is connected to the input terminal A of the control signal.

[0022] Its working principle is: when the control drive circuit 1 outputs a high level, the diode D1 is turned on, and the high level signal is quickly added to the gate of the P-channel device Q1 through the diode D1, so that Q1 is quickly cut off; at the same time, When the diode D2 is turned off, the high-level...

Embodiment 3

[0026] see image 3 , in order to further improve the safety and reliability of the driving circuit, a current limiting resistor R3 is connected in series with the source of the P-channel enhanced switching device Q1 to limit the maximum current flowing through the switching device Q1.

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Abstract

The invention discloses a drive circuit capable of quickly switching off a depletion type switching element. The drive circuit mainly comprises a P-channel enhanced switching element, a N-channel enhanced switching element and resistors connected with the grids of the two switching elements, and moreover, the drain of the P-channel enhanced switching element is connected with the drain of the N-channel enhanced switching element. The two switching elements are alternately switched on under the control of pulse width modulated signals, and the voltage between the drain and the source of the N-channel enhanced switching element is reversely added between the grid and the source of the depletion type switching element to control the on-off of the depletion type switching element. The drive circuit is characterized in that the depletion type switching element can be quickly switched on or off. The invention not only solves the problem on how to drive the depletion type switching element used in the prior switching power supply or the prior switching power converter, but also solves the problem on how to quickly switch off the depletion type switching element.

Description

technical field [0001] The invention relates to a driving circuit of a depletion-type power switching device, which is mainly used in a switching power supply or a switching power converter, specifically a driving circuit capable of quickly turning off the depletion-type switching device. Background technique [0002] In the prior art, field effect power switching devices have been widely used in the field of power conversion due to their characteristics of easy driving and fast switching speed. Field-effect power switching devices can be divided into enhanced type and depletion type, but most of the field-effect power switching devices used in switching power supplies or switching power converters are enhanced switching devices, and their turn-on and turn-off are controlled by It is controlled by the pulse width modulation signal provided by the drive circuit, and the amplitude of the pulse width modulation signal is generally 0-15V. That is to say, when the control drivin...

Claims

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Application Information

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IPC IPC(8): H02M1/088H02M3/155
Inventor 刘树林曹晓生杨波王媛媛
Owner XIAN UNIV OF SCI & TECH
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