Direct-current power supply device, power supply device for...

Details Direct-current power supply device, power supply device for... Direct-current power supply device, power supply device for...

2011-07-12

2011-07-12

Vo, Tuyet Thi (Department: 2821)

Electric lamp and discharge devices: systems

Pulsating or a.c. supply

With power factor control device

C315S224000, C315S18500S, C315S307000, C315S312000

Reexamination Certificate

active

07977889

ABSTRACT:
Disclosed is a direct-current power supply device, including: an inductor; a switching element to intermittently supply a current to the inductor; an output terminal connected to an external unit; a rectifying element connected between the inductor and the output terminal; a PFM comparator to generate a first pulse signal having a pulse width corresponding to a voltage proportional to an output current of the external unit; a duty control circuit to generate a second pulse signal by controlling a pulse width of an oscillation signal having a predetermined frequency in response to an externally-supplied current control signal; a logic circuit configured to output the second pulse signal during a period when the first pulse signal is at a predetermined level; and a drive circuit to generate a drive signal for driving the switching element based on the second pulse signal.

REFERENCES:
patent: 2009/0160422 (2009-06-01), Isobe et al.
patent: 2009/0237051 (2009-09-01), Saitoh
patent: 2009/0278521 (2009-11-01), Omi et al.
patent: 2007-220855 (2007-08-01), None

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