Following voltage/current regulator

Details Following voltage/current regulator Following voltage/current regulator

1988-01-21

1989-03-21

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

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

323281, 323303, 323907, 323908, G05F 1565

Patent

active

048146870

ABSTRACT:
A following voltage/current regulator includes a field effect transistor (FET) (48) connected in series between an unregulated voltage source (44) and a load, such as a motor bridge circuit (50). The conduction of the FET is controlled by a control circuit (56) which measures the input voltage to the FET source, the output voltage from the FET drain and the current drawn by the load. Initially, when power is turned on, the inrush current to the load is limited until a predetermined voltage differential between the input and output voltages is achieved at steady state. Then, the voltage regulator maintains the predetermined voltage differential to provide a well regulated output voltage to the load despite fluctuations in supply voltage. This "following" action limits the heat disipation and protects the FET. Because the voltage regulator uses no inductors or transformers, there are no saturation problems and the circuit may be compactly packaged. No switching spikes are produced to cause video interference, and due to suppression of ripple current by the voltage regulator, there is little conducted electromagnetic interference (EMI).

REFERENCES:
patent: 3916294 (1975-10-01), Kennedy
patent: 4390828 (1983-06-01), Converse et al.
patent: 4536699 (1985-08-01), Baker
patent: 4580090 (1986-04-01), Bailey et al.
patent: 4704572 (1987-11-01), Melbert
patent: 4717867 (1988-01-01), Forehand

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