초록 ▼

A control apparatus for a cycloconverter includes m sets of bridge converters connected between the input terminals of an m-phase load (m≥3) and is applied for a cycloconverter of which the common connection point of the bridge converters is disconnected from a neutral point of the load. The output

A control apparatus for a cycloconverter includes m sets of bridge converters connected between the input terminals of an m-phase load (m≥3) and is applied for a cycloconverter of which the common connection point of the bridge converters is disconnected from a neutral point of the load. The output voltage of each bridge converter is controlled by a reference voltage signal during a 1/m period of one cycle of the load voltage. The center of the 1/m period is located at a positive or negative maximum amplitude point of the load voltage. The output voltage is also controlled during the remaining period of (1-1/m) by a phase control input signal corresponding to a difference between a reference current signal and the load current. The reference voltage signal and the phase control input signal are selected by switching signals from a logic circuit for detecting phase voltages of the load to alternately be applied to the phase control circuits.

대표청구항 ▼

A control apparatus for a cycloconverter which is connected to a multiphase AC power source and includes m sets of bridge converters each of which has a first output terminal connected to a common connection point and a second output terminal connected to a corresponding input terminal of a m-phase

A control apparatus for a cycloconverter which is connected to a multiphase AC power source and includes m sets of bridge converters each of which has a first output terminal connected to a common connection point and a second output terminal connected to a corresponding input terminal of a m-phase load (m≥3) disconnected from said common connection point, and is comprised of silicon controlled rectifier (SCR) elements, said control apparatus comprising: voltage control means for controlling the output voltages of said bridge converters in accordance with a predetermined reference voltage signal; current control means for controlling the output voltages from said bridge converters in accordance with a phase control input signal dependent on a difference between a reference current signal to determine the output currents from said bridge converters and the load currents of said load; and switching means for periodically switching said voltage control means and said current control means in accordance with a phase of the load voltage; wherein said voltage control means controls by said reference voltage signal the output voltage of the bridge converter corresponding to a load voltage during a 1/m period of one cycle of said load voltage, the center of said 1/m period being located at a positive or negative maximum amplitude point of said load voltage, and said current control means controls by said phase control input signal the output voltage of said bridge converter during the remaining (1-1/m) period of said one cycle of said load voltage.