Current-limiting circuit

Details Current-limiting circuit Current-limiting circuit

1986-08-05

1989-02-28

Wong, Peter S.

Electricity: power supply or regulation systems

In shunt with source or load

Using choke and switch across source

323285, 361 18, G05F 146

Patent

active

048089052

ABSTRACT:
A subscriber power controller device for converting a high voltage at a S interface into a stable, regulated low voltage to be used by integrated circuits in an ISDN terminal includes a control logic circuit for generating an output signal to control the duty cycle of an output transistor in an output driver circuit. The control logic circuit is responsive to a ramp signal, an error signal, a high reference voltage signal, a low reference voltage signal and a synchronizing signal for generating the output signal. The output signal is in the form of a pulse train in which each pulse thereof is variable in width dependent upon the error signal. A current-limiting circuit is provided and is responsive to output current of the output transistor for generating a current-limiting signal when the output current exceeds a certain preset limit. The control logic circuit is responsive to the current-limiting signal for automatically terminating each pulse of the pulse train in the output signal on a pulse-by-pulse basis when the output current exceeds the preset limit.

REFERENCES:
patent: 4428015 (1984-01-01), Nesler
patent: 4494178 (1985-01-01), Ishima
Nelson, "Switching Controller Chip Handles 100W from a 5-Pin Package", Electronic Design, Dec. 26, 1985, pp. 73-78.

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