Soft-start switch with voltage regulation and current limiting

Details Soft-start switch with voltage regulation and current limiting Soft-start switch with voltage regulation and current limiting

1997-07-11

1999-01-19

Hecker, Stuart N.

Electricity: power supply or regulation systems

Output level responsive

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

323238, 323901, 363 49, G05F 140

Patent

active

058617370

ABSTRACT:
A MOSFET, an op-amp, a comparator circuit, and voltage dividers with capacitors are employed in combination to effectuate a soft-start switch with current limiting. The transconductance of the MOSFET is employed so that no sense resistor is required. The MOSFET and op-amp are configured as a closed-loop feedback circuit in which the output of the op-amp is coupled to the gate of the MOSFET and the inverting input of the op-amp is coupled to the output of the soft-start switch via a voltage divider. A first RC circuit provides a voltage to the non-inverting input of the op-amp which can be triggered to gradually rise from a value close to zero to some reference voltage so as to soft-start a load. Current limiting means are effectuated by a comparator circuit and voltage dividers with capacitors. The current limiting means brings the MOSFET to an OFF state and the non-inverting input of the op-amp close to zero volts if the op-amp charges a second RC circuit so that the voltage drop across its capacitor exceeds a pre-determined limit-reference, and also, once the current limiting means brings the MOSFET to the OFF state, the current limiting means allows the soft-start switch to begin a soft-start power-up after a pre-determined time dependent upon the time constant of the second RC circuit.

REFERENCES:
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patent: 4924170 (1990-05-01), Henze
patent: 5015921 (1991-05-01), Carlson et al.
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patent: 5528132 (1996-06-01), Doluca
patent: 5619127 (1997-04-01), Warizaya
"Programmable Electronic Circuit Breaker" UNITRODE, UCC 3912, pp. 6-437 6-441.

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