具有负载普适性的高压双极性方波脉冲源研制

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Abstract In order to meet the requirement of microorganism sterilization experiments, a newly high voltage square pulse generator with adjustable polarity is put forward. The main topology circuit is that a half bridge Marx generator cascades a H bridge. Moreover, a DSP control unit takes charge of switch on/off situation of the H bridge namely two loops for outputting negative pulses or positive pulses alternatively. The operation principle of each module on condition of various loads is illustrated in the paper. Moreover, it is tested and verified by PSIM software simulation. In addition, a prototype of pulse generator is self-made, whose output electrical parameters are as follows, peak voltage reachs ±7kV, maximum current attains ±10A, pulse frequency is up to 1kpps, rising edge is 160ns, pulse width is 3.5μs. The pulse generator can work stable at various load conditions, and it is easy to adjust the voltage, frequency, pulse width and polarity. In general, it is easy to realize modularization and miniaturization of manufacture, and the IGBT floating drive technology guarantees its safe and reliable operation.

Key words： Bipolar square pulse rising edge Marx generator H bridge

Received: 16 July 2014 Published: 14 September 2015

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