Current surge limited power supply

Details Current surge limited power supply Current surge limited power supply

1985-12-13

1986-12-23

Salce, Patrick R.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323222, 323908, 363 56, 361 57, G05F 156

Patent

active

046314709

ABSTRACT:
An inrush current limited power supply includes a regulator with a capacitor coupled across its input terminals. If voltage to be regulated is suddenly applied by a switch to the input terminals of the regulator, an undesirably large current surge occurs as the capacitor charges. The magnitude of the current surge is limited by a surge limiting resistor coupled in series with the switch. This limits the surge current, but undesirably causes power dissipation in the resistor during normal operation. The channel of a FET is connected across the resistor. The FET has a conductivity which is low when the gate-to-source voltage is low, for preventing large inrush current immediately after turn-on. A control voltage generator generates a control voltage by rectifying an alternating voltage, and it is coupled to the gate and source of the FET. In one embodiment, the control voltage generator is referenced to an input terminal of the regulator. In another embodiment it is referenced to output terminal. The alternating voltage may be generated by an oscillator, or it may be derived from operation of a switching regulator.

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