Abstract
High-voltage solid state pulse modulators are designed to handle voltage levels, which are several times the order of individual device voltage ratings, necessitating series connection of switches. The main challenge in series connection is to ensure equal voltage across all the devices in the stack under steady state and transient conditions. This paper describes the circuit design for static and dynamic voltage equalization in series-connected high-voltage BiMOSFETs operating in the pulsed mode. A generalized expression for voltage equalization circuit parameters has been derived and standby protection is achieved by means of active clamping. The dynamic equalization circuit has low power loss and the designed system has the capability to withstand turn-on/turn-off failure of one or more devices. A prototype 4 kV series switch has been simulated in PSpice, built and tested under deliberate asynchronism and also by removing the gate pulse to the lower device in the stack. This work forms a part of high-voltage pulse modulator development at Pulsed High Power Microwave Division, Raja Ramanna Center for Advanced Technology, Indore.
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