Transformer isolation complementation driving circuit with adjustable dead zone

Abstract

The invention discloses a transformer isolation complementation driving circuit with an adjustable dead zone. The transformer isolation complementation driving circuit comprises a driver transformer, a blocking capacitor, a bootstrap circuit, a switching-off accelerating circuit, a dead-zone circuit and a shoot-through preventing circuit. The dead-zone circuit works when the level of a driving pulse becomes high to delay driving of output responses, and therefore the problems that according to a traditional transformer isolation complementation driving circuit, a dead zone circuit can not be additionally arranged and the dead time can not be regulated are effectively solved. In addition, to avoid the phenomena that the energy of a blocking capacitor and a bootstrap capacitor of the traditional driving circuit can not be released in time and shoot-through of a power switch tube occurs in the driving stopping process, the shoot-through preventing circuit is additionally arranged to avoid the shoot-through problem. The transformer isolation complementation driving circuit has very high practical value.

Description

technical field [0001] The invention relates to a transformer isolation complementary drive circuit, in particular to a transformer isolation complementary drive circuit with adjustable dead zone. Background technique [0002] Switching power supply has been widely used, and the driving circuit is a very important part of switching power supply. Due to the needs of the power topology itself or for safety considerations, it is often necessary to isolate the driving pulse from the control circuit from the power switch tube. [0003] Pulse transformer isolation is a commonly used form of isolation for power device drive circuits. It not only has a simple structure, does not need to provide an isolated power supply, but also can transmit pulse signals without delay, which meets the electrical isolation, rapidity and drive capability of the drive circuit. Requirements, so it is widely used in isolated drive circuits. [0004] In some common active clamp circuit topologies, it i...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to overcome the problem in the prior art that the dead time of the transformer isolation complementary drive cannot be adjusted and the problem that the power switch tube is passed through when the driving pulse of the driving circuit is turned off

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