Control unit for multi-phase static converter

Details Control unit for multi-phase static converter Control unit for multi-phase static converter

H - Electricity

02

M

321/44

H02M 1/084 (2006.01) H02M 7/515 (2006.01)

Patent

CA 1132196

ABSTRACT A digital control unit has an oscillator driven, binary coded counter, the outputs of which are connected to the first addend inputs of a number of adders. The second addend inputs of the adders are connected to phase angle inputs. The summation outputs of the adders are connected to a logic circuit, which derives timing pulses from the signals at the summation outputs of the adders and interlinks them to form a three-phase system of firing pulses for the controlled valves of the converter. The control unit can be used for fast shutdown of the controlled converter by blocking the firing pulses for the controlled main valves and shifting the firing pulses for the quenching valves as a function of the instantaneous phase of the converter output voltage; also the operating frequency can be increased.

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