Apparatus and method for a switching power supply with a power s

Details Apparatus and method for a switching power supply with a power s Apparatus and method for a switching power supply with a power s

1995-01-23

1997-02-04

Wong, Peter S.

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

363 56, H02M 3335

Patent

active

056005458

ABSTRACT:
A switching power supply having a power steering clamp is disclosed. The power supply may suitably include a pulse width modulator controller which controls a first switch for controlling the flow of energy into and out of a transformer. The power steering clamp suitably includes a second switch, clamp diodes, and circuitry for driving the gate of the second switch. The circuitry for driving the gate of the second switch is preferably controlled by the pulse width modulator controller. Use of the power steering clamp permits leakage energy to be rerouted subsequently to the transformer. This feature may improve the efficiency of the circuit and also avoids the need for heat sinks to prevent overheating of circuit components. Such a switching power supply is particularly suitable for use in high density devices, such as a banknote or bill validator.

REFERENCES:
patent: 4639849 (1987-01-01), Noworolski et al.
patent: 5019957 (1991-05-01), Wilkinson
patent: 5079689 (1992-01-01), Gidon et al.
patent: 5331532 (1994-07-01), Iwai et al.
S. Clemente, B. Pelly, R. Ruttonsha, "A Universal 100 kHZ Power Supply Using a Single HEXFET.RTM.," International Rectifier, HEXPET.RTM. Designer's Manual, pp. 15-26, 1993.
Silicon General Product Catalog, "Solutions for Data Conversion and Power Management", pp. 4-191 to 4-208, Dec., 1989.

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