Electronic trip device comprising a power supply control device

Details Electronic trip device comprising a power supply control device Electronic trip device comprising a power supply control device

1994-05-10

1996-07-30

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

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

323277, 323284, G05F 140

Patent

active

055414990

ABSTRACT:
The power supply control device comprises two regulating modes, linear regulation and chopping regulation. A current from a sensor, rectified by diodes, supplies a power supply circuit comprising a storage capacitor and a regulating transistor. A resistor and a control circuit measure the value of the current and select the regulating mode via a selector. If the current is lower than a preset threshold regulation is linear, the base of the transistor is connected to a Zener diode. When the current exceeds a preset threshold regulation is chopped and the base of the transistor is connected to the output of a comparator.

REFERENCES:
patent: 3890537 (1975-06-01), Park et al.
patent: 3913002 (1975-10-01), Steigerwald et al.
patent: 3983473 (1976-09-01), Sanderson
patent: 4350948 (1982-09-01), Meroni
patent: 4502152 (1985-02-01), Sinclair
patent: 4791350 (1988-12-01), Roof
patent: 5034676 (1991-07-01), Kinzalow
patent: 5337205 (1994-08-01), Haun et al.

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