Siemens Aktiengesellschaft

Patrick Woehrle

Adolf Habock

Paul F Muller

A control unit for a converter has a circuit for the formation of a periodic control signal having a given pulse pattern including a memory in which code words designating the position of the switching pulses (flanks) of the control signals in one period or subperiod of the converter voltage, divided into a number of increments, are stored. Address input of the memory is connected to an addressing unit which generates addresses associated with the pulse pattern of the control signal and with the switching pulses within the pulse pattern. A digital comparator compares the code words at the output of the memory with the count of a counter. Whenever the code word and the count are in agreement, the comparator triggers a pulse stage generator whose output signal represents the control signal and advances the addressing unit to the next address. The invention makes possible the formation of control signals independent of circuit for different converter types and converter circuits is thus made possible.

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Erlangen, Germany

Patrick Woehrle