Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1984-11-29
1986-10-28
Wong, Peter S.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 37, 361 92, 318803, H02M 545, H02H 7122
Patent
active
046202960
ABSTRACT:
When a d-c bus voltage is produced by rectifying applied a-c power line voltage in a rectifier bridge (such as a phase-controlled SCR rectifier bridge), controlled by a feedback loop which compares a feedback signal representing the d-c bus voltage with a command signal representing a desired set point level and from the comparison automatically maintains the bus voltage at the set point level, unwanted a-c line voltage interruptions may have a deleterious effect on the rectifier bridge itself and on a load driven by the bus voltage. This occurs because during a power interruption (when the bus voltage drops) the command signal causes the feedback loop to impose a control on the rectifier bridge which attempts to increase the d-c bus voltage back to the magnitude represented by the command signal. When power is subsequently restored, the d-c bus voltage will suddenly increase very sharply and may destroy electrical and/or mechanical components in the system. Immunization against the effects of the power interruptions is obtained by substituting the feedback signal for the command signal, during the occurrence of a power interruption, which will shut the rectifier bridge down and will force it to produce only a minimum amplitude d-c bus voltage when power is later restored. After power resumes, the rectifier bridge will be controlled by an acceleration regulating circuit so that the bus voltage gradually increases, at an adjustable rate, back up to the desired level set by the command signal.
REFERENCES:
patent: 3784846 (1974-01-01), Krick et al.
patent: 3950675 (1976-04-01), Weber et al.
patent: 4027202 (1977-05-01), Tyler et al.
patent: 4060841 (1977-11-01), Allen
patent: 4376968 (1983-03-01), Wueschinski
Dana Corporation
Jones Judson H.
Leonardi Robert M.
Tracy James E.
Wong Peter S.
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