Power supply with multiple isolated regulators and isolation mod

Details Power supply with multiple isolated regulators and isolation mod Power supply with multiple isolated regulators and isolation mod

1995-07-14

1997-08-19

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Plural supply circuits or sources

Plural converters

3642731, 3642732, 3642733, 3642734, 3642735, 364492, 307 65, 307146, 363 34, 363 65, H02M 721

Patent

active

056592086

ABSTRACT:
A method of operating a redundant power supply is disclosed wherein two or more converters are separately connected to a common output node through separate diodes to isolate the converters and allow the outputs to be separately tested for diagnostic purposes. The diodes are selectively bypassed by connecting drain-to-source paths of P-channel MOS field-effect transistors separately across the diodes. During the diagnostic mode of operation, a controller shuts off the MOS transistors, so the diodes are effective in isolating the converters. During the bypass mode of operation, the transistors are turned on by the controller so the diodes are bypassed and their forward voltage drop does not appear in the circuit and so power dissipation is reduced. It is noted that the P-channel MOS transistor is connected such that it's intrinsic PN-junction diode conducts in a forward direction in parallel with the isolation diode, so that isolation during the diagnostic mode is not cancelled. The controller switches from the diagnostic mode to the bypass mode after a delay allowing the diagnostics routine to complete.

REFERENCES:
patent: 4948997 (1990-08-01), Ohmitsu et al.
patent: 5155672 (1992-10-01), Brown
patent: 5173848 (1992-12-01), Roof

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