H - Electricity – 02 – M
Patent
H - Electricity
02
M
H02M 1/08 (2006.01) H02M 1/088 (2006.01) H03K 17/10 (2006.01)
Patent
CA 2131339
A method and a device for driving a series circuit of power semicondutor switches (2) are specified. In this case, the voltage loading of the individual switches of the series circuit is balanced by providing that the voltage (Ucel ... Ucen) across each switch of the series circuit is measured as the controlled variable, and that this measured voltage is used to vary the switching instants in such a way that the voltage loading during switching is essentially equal for all the switches. In addition, the level of the control voltage (Ugeoff1 ... Ugeoffn) in the blocking state can be influenced with the aid of the measured voltage in such a way that the blocking voltages of the switches are essentially equal. The advantage of the invention is to be seen in that the voltage loading of the individual semiconductors can be balanced not only during switching, but also in the blocking state. In addition, the control also balances influences of parameter differences and parameter changes, as well as influences of the circuit. As a result, the switches can be optimally utilized in terms both of power and of frequency.
Gerster Christian
Schob Reto
Abb Management Ag
Abb Schweiz Ag
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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