Circuit for inhibiting transition phenomenon in power supply uni

Electric power conversion systems – Current conversion – With condition responsive means to control the output...

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363 21, 315387, H02M 324, H02M 3335, H01J 2956

Patent

active

060057890

ABSTRACT:
A circuit for inhibiting a transition phenomenon in a power supply unit is disclosed. When the power supply mode is shifted, a transition phenomenon is made not to appear in the operating power supplied to the load. The circuit includes a microcomputer which judges as to the presence or absence of horizontal and vertical synchronizing signals supplied from the computer system so as to vary the power in a stepwise form when shifting the power supply mode. In accordance with control signals of the microcomputer, a feedback level adjusting section reduces the error detected voltage in a stepwise form when the power is fed back from a second rectifying section through an error detecting section to a pulse width modulator (PWM) control section. Therefore, in accordance with the stepwisely decreasing error detected voltage, the pulse width modulator (PWM) control section reduces its output signals in a stepwise form, so that the power supplied to the load can be reduced in a stepwise form.

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patent: 4634939 (1987-01-01), Dietz
patent: 4980811 (1990-12-01), Suzuji et al.
patent: 5329211 (1994-07-01), Sasaki et al.
patent: 5714843 (1998-02-01), Youn

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