Transformerless fast current limiter with symmetry...

Details Transformerless fast current limiter with symmetry... Transformerless fast current limiter with symmetry...

H - Electricity

02

M

321/29

H02M 3/00 (2006.01) H02H 7/12 (2006.01) H02M 3/337 (2006.01)

Patent

CA 1160284

D-22,565C TRANSFORMERLESS FAST-CURRENT LIMITER WITH SYMMETRY CORRECTION FOR A SWITCHED-MODE POWER SUPPLY by John E. R. White ABSTRACT OF THE DISCLOSURE A switched mode power supply employs a pulse width modulation controlled DC-to-DC converter to change a first voltage from a source of DC power into a regulated power source providing direct current at a second DC voltage. A transformerless current-sensing device is adapted for connection in the path between said source and said converter and provides a control signal which is representative of the current flowing in said path. A current-limiter control circuit is responsive to said control signal and provides an enabling output state when the sensed- current exceeds a predetermined value. The enabling state overrides the pulse width modulator control and inhibits the converter, thus terminating the output pulse when the sensed current exceeds said predetermined value.

365812

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