H - Electricity – 02 – M
Patent
H - Electricity
02
M
H02M 1/00 (2006.01)
Patent
CA 2158956
The invention relates to a circuit arrange- ment (28) for protecting against switching overvoltages power semiconductor switches (T1, T2) which can be switched on and off via their control input (G) and form a pair (2) of arms in a power converter (4). According to the invention, the circuit arrangement (28) comprises a comparator which has a downstream analog amplifier with a limiting characteristic curve and is connected in an electrically conductive fashion on the output side to a control input (G) of the power semiconductor switch (T1, T2) to be protected, an actual voltage (UCE) and a pre- determined desired voltage (U*CE) Of the main terminal (C) of this power semiconductor switch (T1, T2) being present across the comparator. The result is a circuit arrange- ment (28) for protecting against overvoltages, it being possible to dispense with an RCD wiring network for the power semiconductor switches, since very small voltage deviations are detected immediately and the power semi- conductor switch is switched off in a controlled fashion.
Marquardt Rainer
Seidl Udo
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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