Switching mode power supply controller

Details Switching mode power supply controller Switching mode power supply controller

1995-10-03

1997-10-07

Sterrett, Jeffrey L.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 21, 363 49, H02M 3335

Patent

active

056754850

ABSTRACT:
A controller for a switching mode power supply has connections for receiving direct operating potential, a voltage comparator for comparing a fraction of the direct operating potential to a first direct reference potential for developing a voltage comparator output signal, an oscillator for generating oscillations of a prescribed frequency, a pulse width modulator for supplying pulses at a rate determined by those oscillations and with a width controlled by the comparator output signal, and an under-voltage lock-out circuit producing a controlling signal to selectively disable the output pulse signal. The controller is included in a switching mode power supply receiving input power having a direct input potential. The switching mode power supply has a transformer for transforming an alternating voltage generated from the direct input potential; a rectifier for rectifying transformed alternating voltage to produce a direct output potential; a regulator sinking current responsive to the direct output potential from said rectifier being larger or smaller larger than a second direct reference potential; a photo-coupler conducting as input current the current sunk by the regulator, converting the current into an optical signal, and then converting said optical signal into an electric signal; and a switching controlling unit producing a controlling signal to control selective application of the direct input potential to the transformer in response to output current demanded by the photo-coupler. The switching controlling unit comprises a switching-mode-power-supply controller for performing the function of power supply, feedback and soft-start, in response to an operating voltage signal supplied thereto through external pins thereof; a resistor and capacitor converting the magnitude of the current supplied from the photo-coupler into the operating voltage signal; and a switching transistor cyclically tuned on and off in response to a pulse signal produced from the switching-mode-power-supply controller. The switching transistor selectively applies the direct input potential to the transformer for generating the alternating voltage that is transformed.

REFERENCES:
patent: 4694384 (1987-09-01), Steigerwald et al.
patent: 4837452 (1989-06-01), Peterson
patent: 4862339 (1989-08-01), Inou et al.
patent: 4881014 (1989-11-01), Okochi
patent: 4956761 (1990-09-01), Higashi
patent: 4967332 (1990-10-01), Claydon et al.
patent: 4975623 (1990-12-01), Rilly et al.
patent: 5014178 (1991-05-01), Balakrishnan
patent: 5262933 (1993-11-01), Shyi-Hon
patent: 5297014 (1994-03-01), Saito et al.
patent: 5301095 (1994-04-01), Teramoto et al.
patent: 5313381 (1994-05-01), Balakrishnan
patent: 5335162 (1994-08-01), Martin-Lopez et al.
patent: 5475579 (1995-12-01), John et al.
patent: 5498995 (1996-03-01), Szepesi et al.

Affiliated with

Also associated with

Rating

Switching mode power supply controller does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Switching mode power supply controller, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Switching mode power supply controller will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2362127