Switching regulator and power supply using the same

Details Switching regulator and power supply using the same Switching regulator and power supply using the same

2005-02-01

2005-02-01

Laxton, Gary L. (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S288000, C323S901000, C323S908000, C363S049000

Reexamination Certificate

active

06850047

ABSTRACT:
The power supply PS includes a voltage detecting circuit VD for detecting a voltage level Vs inputted from an external voltage source, a boot strap circuit BS, andET connected in parallel with BS, a smoothing circuit SM connected with the BS output terminal and a regulating IC connected with BS and FET. The regulating IC includes VD, a transistor Tr and condenser C. Both when a PS switch is turned on and when VD detects that Vs (which once descended) reaches an ascending reference, a high level driving signal generated by VD is changed into a low level signal, thereby turning off Tr connected with C. Thus, until Tr completes charging up C, a duty ratio of a pulse width modulation (PWM) signal dependent on the SM output is made gradually greater, thereby surely preventing a rush current by turning on and off the FET by the PWM signal.

REFERENCES:
patent: 6674272 (2004-01-01), Hwang
patent: 6-250747 (1994-09-01), None
patent: 6-335238 (1994-12-01), None
patent: 9-37545 (1997-02-01), None
patent: 9-285110 (1997-10-01), None
patent: 10-23749 (1998-01-01), None
patent: 10-56776 (1998-02-01), None
patent: 10-215568 (1998-08-01), None

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