AC input free power source

Details AC input free power source AC input free power source

1987-01-16

1989-06-27

Wong, Peter S.

Electric power conversion systems

Current conversion

With condition responsive means to control the output...

363142, 363143, 323299, H02M 704, G05F 500

Patent

active

048435368

ABSTRACT:
There is disclosed an AC input free power source comprising a power transformer to receive an AC input, a rectifier to convert the AC input into a DC output, and a switching transistor so driven as to produce a stable current by the switching action thereof. In addition to the above, the present invention further includes a primary voltage detection circuit with the switching transistor used as a first switching transistor, wherein the voltage to be applied thereto is obtained substantially from the center of the secondary winding of the power transformer, while the AC input voltage is detected and a control signal is outputted in accordance with the value of the detected voltage. A switching input voltage changeover circuit having a second switching transistor and, in response to the control signal, changing the first and second switching transistors selectively for execution of the switching action.

REFERENCES:
patent: 3260920 (1966-07-01), Shoemaker
patent: 3460023 (1969-08-01), Becker
patent: 3720868 (1973-03-01), Lee
patent: 3979661 (1976-09-01), Matz
patent: 4675801 (1987-06-01), Terada
patent: 4733158 (1988-03-01), Marchione et al.

Affiliated with

Also associated with

Rating

AC input free power source does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with AC input free power source, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and AC input free power source will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-818086