SMPS with low load switching frequency stabilization

Details SMPS with low load switching frequency stabilization SMPS with low load switching frequency stabilization

1996-06-19

1998-05-05

Sterrett, Jeffrey L.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363 21, 363131, H02M 7539

Patent

active

057484619

ABSTRACT:
A switch-mode power supply has a control device with an input for a control voltage which is coupled to a secondary voltage and an output for controlling a transistor that is connected in series with a primary winding of a switch-mode power supply transformer. The control device additionally includes a device for inhibiting the switching transistor from switching on again when a control error that is formed in the control device is less than a reference value. The control signal input and the output of the control device are coupled through a coupling element having a low-pass filter characteristic. A switching-on pulse for the switching transistor is consequently superimposed on the control voltage, with a time delay. If the load to be supplied is small (standby mode), the switching of the switching transistor is inhibited until the switching-on pulse which is coupled to the control voltage has decayed. A stable switching frequency slightly above the audibility limit can be set for the standby mode. The power loss is accordingly low.

REFERENCES:
patent: 4593347 (1986-06-01), Peruth et al.
patent: 4928220 (1990-05-01), White
patent: 4984145 (1991-01-01), Dungschat et al.
patent: 4985818 (1991-01-01), Niederreiter
patent: 5170333 (1992-12-01), Niwayama
patent: 5317499 (1994-05-01), Brakus
patent: 5448469 (1995-09-01), Rilly et al.
patent: 5497311 (1996-03-01), Hanawaka

Affiliated with

Also associated with

Rating

SMPS with low load switching frequency stabilization does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with SMPS with low load switching frequency stabilization, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and SMPS with low load switching frequency stabilization will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-61329