H - Electricity – 02 – M
Patent
H - Electricity
02
M
321/24
H02M 5/45 (2006.01) H02H 7/12 (2006.01) H02M 7/162 (2006.01)
Patent
CA 1184244
PROTECTION SYSTEM FOR IMMUNIZING AN INVERTER SYSTEM AGAINST A-C LINE VOLTAGE DISTURBANCES Abstract: When a-c power line voltage is rectified by a phase-controlled SCR rectifier bridge to develop an adjustable d-c bus voltage which is then con- verted by an inverter back to a-c for driving a load, such as a motor, line voltage disturbances, resulting from momentary power outages or major power reductions, will have a deleterious effect on the operation of the inverter system. Such disturbances will cause improper firing of the SCR's and the d-c bus voltage may increase con- siderably, disrupting the normal operation of the inverter system and possibly destroying the switching devices in the inverter. Immunization against the effects of the line voltage disturbances is obtained by shutting down or disabling (37,65-92) the phase-controlled SCR SCR rectifier bridge (10) anytime such a disturbance occurs. In this way, while the output voltage of the rectifier bridge is effectively interrupted during the ocrurrence of each. line voltage disturbance, the inverter (26) will continue to operate in near normal manner in response to the d-c voltage provided by the filter capacitor (19). At the conclusion of each dis- turbance, the operation of the rectifier bridge (10) will be slowly restored to normal to avoid overshoot of the d-c bus voltage.
395351
Siemon Edward C.
Wueschinski Russel P.
Borg-Warner Corporation
Macrae & Co.
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