Electric power conversion systems – Current conversion – Having plural converters for single conversion
Patent
1997-01-28
1999-04-13
Wong, Peter S.
Electric power conversion systems
Current conversion
Having plural converters for single conversion
363 65, 363 67, 307 66, 307 43, H02M 700, H02J 100, H02J 700
Patent
active
058944133
ABSTRACT:
The present invention is a method and apparatus for providing a power supply system having a redundant power supply switchover circuit, which maintains a remotely regulated output voltage when the power supply system switches over from the primary power supply to the secondary power supply. The power supply system comprises a secondary power supply that is connected in parallel to a primary power supply. The two power supplies are OR-connected to a load through two diodes, with the primary power supply connected to the diode via a monitor. During normal operating conditions, the primary power supply delivers most of the current because it operates in a "remote sense" configuration which provides a voltage output that is higher, by a diode voltage drop, than that of the secondary power supply, which operates in a "local sense" configuration. When a monitor detects the failure of the primary power supply, it generates a control signal to direct a relay switch to switch the secondary power supply from the "local sense" configuration to the "remote sense" configuration. As a result, the secondary power supply will deliver the full power requirements of the load. During the momentary switchover period, fluctuations in load voltage are minimal and within the range permitted by most logic devices.
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"ASTEC--The Supplier of Choice--AMPSS Application Notes," Jan. 1996.
Sony Corporation
Sony Trans Com Inc.
Vu Bao Q.
Wong Peter S.
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