Driving circuit of symmetrical half-bridge resonance open-loop direct-current proportional converter

Abstract

The invention discloses a drive circuit of a symmetrical half-bridge resonance open-loop direct-current proportional converter. The drive circuit is characterized in that the output end of a pulse width controller is connected to the input end of a gate driver, the pulse width controller is used for inputting a control signal to the gate driver, the output end of the gate driver is connected to the primary end of an isolation transformer, the gate driver is used for enhancing the current driving capability of the control signal, the secondary end of the isolation transformer is connected to afirst drive circuit and a second drive circuit, the output end of the first drive circuit is connected to the drive end of a resonance circuit, the first drive circuit is used for sending a first drive voltage signal, the output end of the second drive circuit is connected to the drive end of a rectification circuit, and the second driving circuit is used for sending a second driving voltage signal. By means of the technical scheme, switching of a primary side half-bridge transistor and synchronous rectification of a secondary side full-bridge transistor in a symmetrical half-bridge resonanceopen-loop direct-current proportional converter are achieved.

Description

technical field [0001] The present application relates to the technical field of DC conversion, in particular, to a drive circuit for a symmetrical half-bridge resonant open-loop DC proportional converter. Background technique [0002] With the continuous development of power topology and power semiconductor devices, the switching frequency of switching power supply is getting higher and higher, which reduces the size of the power supply and improves the power density. From the switching frequency of about 20kHz in the 1970s and 1980s to more than MHz now level, the switching frequency has been greatly improved, and the high frequency of the switch drive circuit is becoming more and more important. [0003] The current switch drive circuit generally completes the closed-loop feedback adjustment by sampling the output voltage and comparing the error, controlling the conduction pulse width or conduction phase, frequency, etc. of the drive signal. The feedback control circuit i...

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Problems solved by technology

[0003] The current switch drive circuit generally completes the closed-loop feedback adjustment by sampling the output voltage and comparing the error, controlling the conduction pulse width or conduction phase, frequency, etc. of the drive signal. The feedback control circuit is relatively complicated, and the design of the compensation network is optimized. more complex

The front and rear edges of the transistor drive are adjusted by the resistance of the gate series resistor, and the front and rear edges are adjusted at the same time. There is no way to adjust the front or rear edge separately.

In addition, due to the complex design of the circuit, it is easy to cause the oscillation of the closed-loop feedback when the load step changes or the jitter range of the input power is large. When the anti-interference ability of the drive circuit is poor, these oscillation peak interference signals will cause bridge Transistors in common, resulting in bombing, causing failure

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