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Novel isolation driving circuit

An isolation drive circuit and isolation drive technology, applied in electrical components, adjusting electrical variables, instruments, etc., can solve the problems of uncontrollable turn-on and turn-off levels, weak driving ability, large distortion, etc., to increase driving and anti-interference. capability, increased drive capability, low distortion turn-on and turn-off levels

Pending Publication Date: 2019-11-19
佛山市格正电源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0002] Conventional transformer isolation drive mode has disadvantages such as large distortion, uncontrollable turn-on and turn-off levels, and weak drive capability due to direct drive.

Method used

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  • Novel isolation driving circuit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Such as figure 2 The shown half-bridge drive and LLC isolation drive scheme is consistent with the principle of single-tube drive. When the drive signal of the upper tube is turned off, the isolated drive is turned off. When the lower switch is turned on, the totem pole induces a negative voltage, and the drive is clamped at zero voltage. The pipe repeats the process of putting on the pipe to form a process that goes round and round.

Embodiment 2

[0024] Such as image 3 The high-voltage synchronous rectification drive shown is similar to the half-bridge drive. Due to the DC blocking characteristics of the capacitor, the drive transformer couples half of the drive voltage to the main power tube and synchronous rectifier. , so the same driving signal can be used, which greatly simplifies the practical application circuit.

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PUM

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Abstract

A novel isolation driving circuit is disclosed. The negative electrode of a second capacitor E1 is connected to the opposite ends of the secondary winding of an isolation driving transformer T1 and the collector of a second transistor Z2. The corresponding ends of the secondary winding of the isolation driving transformer T1 are connected in parallel with a first resistor R1. The other end of thefirst resistor R1 is connected to the base of a first transistor Z1 and the base of a second transistor Z2. Compared with a traditional isolation driving circuit, the novel isolation driving circuit is greatly improved in driving capability, has low distortion and constant on / off levels, is greatly improved in driving and anti-interference capability at a very low cost, and can be used for high-power transistors and complex circuit architecture. Compared with traditional circuits, the novel isolation driving circuit well suppresses the driving distortion caused by the transformer's coupling and leakage inductance, so that the drive switch level can be controlled without a clamp diode D1.

Description

technical field [0001] The invention relates to the field of synchronous rectification driving for half-bridge and full-bridge circuits requiring isolation driving, and more specifically relates to a novel isolation driving circuit. Background technique [0002] Due to the direct drive, the conventional transformer isolation drive method has the disadvantages of large distortion, uncontrollable turn-on and turn-off levels, and weak drive capability. Contents of the invention [0003] The present invention improves the existing technology in view of the above-mentioned shortcomings, and provides a new type of isolated driving circuit, which utilizes the characteristics of capacitor energy storage, plus a totem pole driving mode, and has strong anti-interference ability when the MOS is turned off, and the driving ability is also enhanced at the same time , the technical scheme is as follows: [0004] A new type of isolated drive circuit, including an isolated drive transfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335
CPCH02M3/33523H02M3/33592
Inventor 查本智
Owner 佛山市格正电源科技有限公司
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