Method and apparatus for a variable frequency inverter...

Details Method and apparatus for a variable frequency inverter... Method and apparatus for a variable frequency inverter...

H - Electricity

02

M

318/103, 321/46

H02M 7/155 (2006.01) H02P 7/36 (1980.01) H02P 13/20 (1980.01)

Patent

CA 1179012

21-D8H-2524 METHOD AND APPARATUS FOR A VARIABLE FREQUENCY INVERTER SYSTEM HAVING COMMUTATION FAULT DETECTION AND CORRECTION CAPABILITIES ABSTRACT OF THE DISCLOSURE An inverter system including a controlled direct current (d.c.) power source for providing a variable d.c voltage to a variable output frequeny inverter circuit by way of a suitable d.c. link includes suitable circuitry for detecting a commutation fault or shoot-through condition within the inverter circuit and for taking appropriate remedial action to correct such condition. The shoot-through condition is determined as a function of the d.c. input current to the inverter circuit, the output alternating current (a.c.) of the inverter circuit and extent condition of the load. In the particular embodiment of the invention illustrated, the load is an a.c. motor and the load condition sensed is whether the motor is in the running or idle mode of operation.

362550

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