H - Electricity – 02 – H
Patent
H - Electricity
02
H
318/108
H02H 7/122 (2006.01) H02M 1/18 (1980.01)
Patent
CA 1145392
t 21-DSH-2540 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 freguency 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 and the output alternating current (a.c.)of the inverter circuit. This determination is achieved by comparing signals representing the two currents at a fixed ratio, other than unity (e.g., at a fixed percentage of one to the other) so that the actual margin increases as the currents increase. Preferably a bias is also included in the comparison function so that a minimum differential is always required before a shoot- through determination is made.
353453
Company General Electric
Eckersley Raymond A.
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