Multi-mode relaxation oscillator

Details Multi-mode relaxation oscillator Multi-mode relaxation oscillator

1978-07-03

1981-02-10

Grimm, Siegfried H.

Oscillators

With device responsive to external physical condition

331111, 331143, 340521, G08B 1900, G08B 2300, H03K 302

Patent

active

042504643

ABSTRACT:
In a relaxation oscillator where the oscillation frequency is proportional to the charge rate of a capacitor, independent current sources are connected through separate switches to change the charge rate of the capacitor and thus the oscillation frequency. Each switch is controlled by signals from a separate detector of a condition which requires that the oscillation frequency be changed. An oscillation frequency increase between the standby and alarm modes of a smoke detector is accomplished in one disclosed embodiment and duty cycle means for controlling the operative period of the alarm indicator during each cycle of the increased oscillator frequency is disclosed in a more particular embodiment.

REFERENCES:
patent: 3487404 (1969-12-01), Midkiff
patent: 3559098 (1971-01-01), Chandos
patent: 3566301 (1971-02-01), Grangaard, Jr.
patent: 3694672 (1972-09-01), Buyak
patent: 3824484 (1974-07-01), Gillette
patent: 3886485 (1975-05-01), Takahashi
patent: 3986143 (1976-10-01), Nutz
patent: 4147996 (1979-03-01), Gontowski, Jr.

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