A Method of Voltage Sharing in Series of Insulated Gate Bipolar Transistors Based on Smooth Sliding Mode Control
A bipolar transistor, series voltage equalization technology, applied in output power conversion devices, electrical components and other directions, can solve the problems of high voltage unbalance, serious chattering, etc., to reduce voltage unbalance, protect IGBT, Small impact effect
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[0025] In order to make the technical means, creative features, goals and effects of the present invention easy to understand, the following embodiments will specifically illustrate the series voltage equalization method involved in the present invention in conjunction with the accompanying drawings.
[0026] The smooth sliding mode is based on the sliding mode control, changing the original discontinuous function into a smooth continuous function to achieve the effect of eliminating chattering. The present invention applies the smooth sliding mode method to the IGBT series voltage equalization problem.
[0027] For IGBTs, set the ideal collector-emitter voltage curve as V ced , the actual collector-emitter voltage is V ce , the voltage error
[0028] e=V ce -V ced (1)
[0029] Derivative of Voltage Error
[0030]
[0031] In the formula, u is the gate control input, ξ is the simplified unknown item, and m is the upper bound value of the unknown item.
[0032] Design...
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