Bulk filter capacitor discharge in a switching power supply

Details Bulk filter capacitor discharge in a switching power supply Bulk filter capacitor discharge in a switching power supply

1997-12-19

1999-12-07

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 37, 363 56, 307 48, 307 66, H02M 545, H02M 542, H02H 7122, H02J 332

Patent

active

059994290

ABSTRACT:
A discharge control circuit for a power supply switching converter that, in response to a cessation of current from an AC power source, makes conductive a main switching element of the switching converter to discharge the bulk filter capacitor through the main switching element to a charge level that meets safety standards. The discharge control unit includes a current limiting circuit for limiting the discharge current through the main switching element in which the rate of rise of the discharge current is controlled with the use of an RC circuit. The discharge control unit also includes a state machine that activates the current limiting circuit in response to a cessation of the modulation mode of the switching converter. The discharge control circuit also includes a reset circuit for placing the state machine in a known state during the startup of the switching converter.

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patent: 5689409 (1997-11-01), Scharlach et al.
patent: 5771162 (1998-06-01), Kwon

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