Over-current timer modulator

Details Over-current timer modulator Over-current timer modulator

1987-04-02

1989-04-04

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 18, 361 87, H02H 710

Patent

active

048191221

ABSTRACT:
A modulator circuit for providing a modulating signal to the timing circuit in a constant off time current mode controller so as to extend the off time in response to an overload condition. A switch connects the output voltage from a current sense amplifier to the modulator circuit when the current mode controller requests maximum current. An overload condition exists when the voltage from the current sense amplifier exceeds a first threshold. The off time is extended to approach infinity when a second threshold is exceeded.

REFERENCES:
patent: 3914667 (1975-10-01), Waldron
patent: 4180842 (1979-12-01), Keeney
patent: 4236187 (1980-11-01), Mochizuki et al.
patent: 4386384 (1983-05-01), Moran
patent: 4428016 (1984-01-01), Brarfield
patent: 4528608 (1985-07-01), Andersson et al.
patent: 4570199 (1986-02-01), Morishita et al.
patent: 4631653 (1986-12-01), Small

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