Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
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:
patent: 4161760 (1979-07-01), Valentine
patent: 4924170 (1990-05-01), Henze
patent: 5015921 (1991-05-01), Carlson et al.
patent: 5045771 (1991-09-01), Kislovski
patent: 5063303 (1991-11-01), Sackman et al.
patent: 5257156 (1993-10-01), Kirkpatrick
patent: 5376831 (1994-12-01), Chen
patent: 5528132 (1996-06-01), Doluca
patent: 5619127 (1997-04-01), Warizaya
"Programmable Electronic Circuit Breaker" UNITRODE, UCC 3912, pp. 6-437 6-441.
Goerke Ulrich B.
Pieper Mark S.
Data General Corporation
Hecker Stuart N.
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