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Isolated driving circuit

An isolated drive circuit and isolated drive technology, applied to electrical components, output power conversion devices, etc., can solve problems such as misconduct of power switch tubes

Active Publication Date: 2015-04-22
ANHUI DYNAMIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide an isolated drive circuit that can avoid the resonance caused by the DC blocking capacitor and the excitation inductance of the drive transformer, and solve the problem that the existing isolation drive circuit may cause shutdown due to the resonance of the DC blocking capacitor and the excitation inductance of the drive transformer. The technical problem of misconduct of the power switch tube

Method used

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Embodiment Construction

[0067] The following descriptions of the various embodiments refer to the accompanying drawings to illustrate specific embodiments in which the present invention can be practiced. The directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", etc., are for reference only The orientation of the attached schema. Therefore, the directional terms used are used to illustrate and understand the present invention, but not to limit the present invention.

[0068] In the figures, structurally similar units are denoted by the same reference numerals.

[0069] Please refer to image 3 , image 3 It is a block diagram of the first preferred embodiment of the isolated driving circuit of the present invention. The isolated drive circuit includes an isolated drive transformer 32 , a double-terminal excitation signal drive control circuit 31 and a pulse drive signal conversion circuit 33 . Wherein the isolati...

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Abstract

The invention relates to an isolated driving circuit, which comprises an isolated driving transformer, a double-end excitation signal driving and controlling circuit and a pulse-driving signal conversion circuit, wherein the double-end excitation signal driving and controlling circuit is used for generating a first pulse driving signal and a second pulse driving signal; and the pulse-driving signal conversion circuit is used for converting an output signal of a secondary winding into a driving signal which is used for driving a corresponding power switching tube. The isolated driving circuit provided by the invention can avoid resonance oscillation caused by the magnetic inductances of a blocking capacitor and a driver transformer.

Description

technical field [0001] The invention relates to the field of drive circuits, in particular to an isolated drive circuit capable of avoiding resonance due to DC blocking capacitors and excitation inductance of drive transformers. Background technique [0002] The pulse transformer isolation drive circuit is a common power switch tube drive circuit. Because of its simple circuit structure, no need to provide an isolated power supply, low cost, and no transmission delay for pulse signals, it can meet the requirements of the power switch tube drive circuit. Requirements for electrical isolation, rapidity, and strong driving force. [0003] Such as figure 1 as shown, figure 1 It is an existing pulse transformer isolation drive circuit, the isolation drive circuit includes a resistor R1, a DC blocking capacitor C1 and an isolation drive transformer T1, and the isolation drive transformer T1 includes a primary winding and a secondary winding. When the driving pulse from the cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/088
Inventor 胡祖荣
Owner ANHUI DYNAMIC POWER