DC power unit and information processing apparatus with the DC p

Details DC power unit and information processing apparatus with the DC p DC power unit and information processing apparatus with the DC p

1996-12-13

1999-03-23

Wong, Peter S.

Electric power conversion systems

Current conversion

With starting arrangement

363 89, 363 59, 323222, H02M 112, H02M 318, G05F 110

Patent

active

058868852

ABSTRACT:
In order to prevent malfunction resulting from the variation of the output of a boosting converter in a boosting two-converter type dc power unit, a dc power unit includes a boosting converter composed of a control circuit and a rectifying diode connected to an ac input through a switch and an insulating dc-to-dc converter connected at a later stage of the boosting converter. Between the boosting converter and the insulating dc-to-dc converter, there is provided a first control circuit composed of a shunt regulator, a voltage dividing resistor for producing a control voltage for the shunt regulator, a photocoupler to be turned on and off by the shunt regulator, and a resistor. When the dc output voltage Vo of the boosting converter reaches a predetermined value, the photocoupler is enabled to handle a REMOTE.sub.-- ON/OFF signal through a remote control terminal for starting the insulating dc-to-dc converter.

REFERENCES:
patent: 4980811 (1990-12-01), Suzuji et al.
patent: 5258901 (1993-11-01), Fraidlin
patent: 5301095 (1994-04-01), Teramoto et al.
patent: 5436550 (1995-07-01), Arakawa
patent: 5457622 (1995-10-01), Arakawa
"Electronic Technology", Mar. 1995, vol. 37, No. 3, 1995, pp. 36-41 & pp. 96-97.

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