Circuit arrangement for limiting the switch-on current and for p

Details Circuit arrangement for limiting the switch-on current and for p Circuit arrangement for limiting the switch-on current and for p

1987-12-02

1990-01-02

Shoop, Jr., William M.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

323276, H02H 904

Patent

active

048917281

ABSTRACT:
A circuit arrangement for limiting the switch-on current and for providing an over voltage protection in switch mode power supply devices. The circuit arrangement has an input-end storage capacitor which forms a low-ohmic voltage source for a connected power supply arrangement. A power supply device of this type is to be provided with a circuit which both limits the switch-on current and also provides a protection against over voltages across the storage capacitor. This is achieved with the assistance of a field-effect transistor which is arranged between the supply voltage source and the storage capacitor and which is controlled both by an amplifier in terms of current limitation and by a delay element in terms of delayed switch-on. The power supply device is particularly suitable for plug-in assemblies having voltage inverters for the supply of electrical communications transmission technology equipment.

REFERENCES:
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patent: 3917980 (1975-11-01), Weisbrod
patent: 3935527 (1976-01-01), Michelet et al.
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patent: 4428016 (1984-01-01), Brasfield
patent: 4438473 (1984-03-01), Cawley et al.
J. E. Buchanan, Limiting A Filter Capacitor's Turn-On Inrush Current, Electronics International, vol. 56, no. 23, p. 133, Nov. 1983.
Nathan O. Sokal, Circuits Eliminate Power-Supply Surge Currents, E.D.N. Electrical Design News, vol. 30, no. 20, Sep. 1985, pp. 141-146.

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