Method and apparatus for controlling current type inverters

Details Method and apparatus for controlling current type inverters Method and apparatus for controlling current type inverters

1979-12-26

1982-01-05

Pellinen, A. D.

Electric power conversion systems

Current conversion

Using semiconductor-type converter

H02M 7515

Patent

active

043097510

ABSTRACT:
In an inverter device comprising an inverter bridge connected across a DC source, an auxiliary thyristor bridge connected to AC terminals of the inverter bridge, a condenser connected across cathode and anode electrodes of the auxiliary thyristor bridge which acts as a first switching circuit for charging and discharging the condenser and a second switching circuit including choppers for connecting anode and cathode electrodes of the auxiliary thyristor bridge across the DC source, there is provided a control method which comprises the steps of comparing voltage of the condenser with a reference voltage, controlling respective switching circuits so as to effect commutation of the inverter bridge in a direction to charge the condenser when the voltage thereof is lower than the respective voltage, controlling respective switching circuits so as to effect commutation of the inverter bridge in a direction to discharge the condenser when the voltage thereof is higher than the reference voltage thereby controlling the condenser voltage in accordance with the reference voltage. According to a modification the conduction times of the second switching circuit and the auxiliary thyristor bridge are varied in accordance with the condenser voltage.

REFERENCES:
patent: 3612973 (1971-10-01), Kuniyoshi
patent: 3707668 (1972-12-01), Johnston
patent: 4039926 (1977-08-01), Steigerwald
patent: 4183081 (1980-01-01), Cutler et al.

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