Surge current-limiting circuit for a large-capacitance load

Details Surge current-limiting circuit for a large-capacitance load Surge current-limiting circuit for a large-capacitance load

1990-07-11

1992-01-07

Zazworsky, John

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307555, 307363, 3072961, 361 11, H03K 508, G05F 156

Patent

active

050794558

ABSTRACT:
A circuit for limiting switch-on surge current to a load including a large capacitance includes a MOSFET whose controlled path is connected in series with the capacitance across power supply terminals. A resistor and a capacitor, having a relatively small capacitance, are also connected in series with the controlled path, and a junction between the resistor and capacitor is connected to a gate of the MOSFET via a further resistor to provide a negative feedback path for charging the load capacitance with a constant current when power is applied. A further capacitor prevents initial turn-on of the MOSFET, and a zener diode limits the gate voltage. An alternative arrangement using a differential amplifier is described. The resistive part of the load can be connected in parallel with the load capacitance, or to the power supply terminals for which it can be separately switched in dependence upon the gate voltage.

REFERENCES:
patent: 3568043 (1971-03-01), Rabus
patent: 3870905 (1975-03-01), Chikazawa
patent: 4254347 (1981-03-01), Ray

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