Electronic switching power supply

Electric power conversion systems – Current conversion – Including d.c.-a.c.-d.c. converter

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Details

363 19, 363 49, H02M 3335

Patent

active

054064694

ABSTRACT:
An electronic switching power supply for supplying power to a load from an input voltage source, including a flyback converter with a transformer having its primary coil connected in series with the collector-emitter circuit of a first transistor in parallel arrangement with the input voltage source, while its secondary coil is connected in series with the load and a first diode, with the emitter of the first transistor being connected to chassis or reference potential through a first resistor while the base of the first transistor is connected to a control circuit (St), with a capacitor in parallel arrangement with the load, with the voltage across the junction (B) of the capacitor at the side remote from reference potential being of the same polarity as the voltage across the junction (A) of the first resistor and the first transistor. The power supply also includes a first circuit, including a second resistor, that is placed between the junction (A) of the first resistor (8) and the first transistor and the junction (B) of the capacitor at the side remote from reference potential, the first circuit serving to reduce a total effective resistance between the emitter of the first transistor and the reference or chassis potential when a voltage across said capacitor is below a predetermined value.

REFERENCES:
patent: 4236198 (1980-11-01), Ohsawa et al.
patent: 4459651 (1984-07-01), Fenter
patent: 4504775 (1985-03-01), Becker
patent: 4510562 (1985-04-01), Maeba
patent: 4864485 (1989-09-01), Rilly et al.
patent: 5200886 (1993-04-01), Shwarz et al.
Electronic Design, vol. 36, No. 20. 8 Sep. 1988, Hasbrouk Heights; New Jersey, p. 111, C. Spearow: "Get Start-And-Run Voltage for Motors".

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