Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1993-01-25
1995-07-18
Pascal, Leslie
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359161, 250551, 375238, H04B 1004
Patent
active
054346940
ABSTRACT:
A signal isolating device, such as used in a signal conditioner which converts an output signal from a temperature sensor, or the like, in a process control system, comprising a pulse width signal outputting means, which receives a pulse width modulated signal and produces differentiated pulses at a leading edge and at a trailing edge of the pulse width modulated signal; a first photo-coupler activated by the differentiated pulse produced at the leadinge edge; a second photocoupler activated by the differentiated pulse produced at the trailing edge; a differential pulse reception means comprising a reception resistor for receiving output pulses from the first photocoupler and the second photocoupler and which produces a set pulse or a reset pulse according to the signal generated at the reception resistor; and a flip-flop circuit which is set or reset by the pulse signal produced by the differential pulse reception means. Advantageously, use of electric power is reduced and signal isolation is attained with stability and without being affected by extraneous noise.
REFERENCES:
patent: 3794841 (1974-02-01), Consentino
patent: 4140980 (1979-02-01), Cummings
patent: 4546262 (1985-10-01), Huggins
patent: 4678937 (1987-07-01), Price
patent: 4812815 (1989-03-01), Miyakoshi
patent: 5043587 (1991-08-01), Miki
Kajitani Takao
Saito Hitoshi
Yamaguchi Kenji
Yoshino Akio
Kojima Moonray
Pascal Leslie
Yokogawa Electric Corporation
LandOfFree
Signal isolating device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Signal isolating device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Signal isolating device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2420949