Temperature sensor probe and sensor detection circuit

Details Temperature sensor probe and sensor detection circuit Temperature sensor probe and sensor detection circuit

1994-06-30

1997-03-18

Paschall, Mark H.

Electric heating

Heating devices

With power supply and voltage or current regulation or...

219481, 219497, 219501, 323369, H05B 102

Patent

active

056119526

ABSTRACT:
A sensor probe and sensor detection circuit used in an electronic temperature control circuit for preventing the control circuit from driving an external device such as a heater when the sensor probe has been disconnected from the control circuit. The sensor probe includes an NTC thermistor and a limiting resistor that are connected in parallel and potted in epoxy. The thermistor and limiting resistor of the sensor probe form part of a lower leg of a voltage divider in the control circuit. The sensor detection circuit compares the voltage signal generated by the sensor voltage divider to a predetermined threshold or ceiling voltage value. During normal operation, when the sensor probe is attached to the control circuit, the resistance of the sensor probe insures that the voltage signal from the sensor voltage divider remains within a predetermined voltage range and does not exceed the predetermined ceiling voltage value. When the sensor probe is disconnected from the control circuit, the resistance of the sensor voltage divider is decreased and the voltage signal exceeds the ceiling voltage value. When the voltage signal exceeds the ceiling voltage value, the sensor detection circuit interrupts the normal operation of the control circuit and shuts down the heater.

REFERENCES:
patent: 3702921 (1972-11-01), Thelen
patent: 4198581 (1980-04-01), Ahmed
patent: 4278872 (1981-07-01), Koether et al.
patent: 4394957 (1983-07-01), Newton, III
patent: 4404462 (1983-09-01), Murray
patent: 4421270 (1983-12-01), Raleigh et al.
patent: 4516543 (1985-05-01), Abe et al.
patent: 4564748 (1986-01-01), Gupton
patent: 4574200 (1986-03-01), Racca et al.
patent: 4604871 (1986-08-01), Chiu et al.
patent: 4633885 (1987-01-01), Du Brucq et al.
patent: 4638135 (1987-01-01), Aoki
patent: 4725713 (1988-02-01), Lehrke
patent: 4745262 (1988-05-01), Larsen
patent: 5043692 (1991-08-01), Sites et al.
patent: 5057669 (1991-10-01), Dennison
patent: 5365040 (1994-11-01), Oka
patent: 5373141 (1994-12-01), Ko

Affiliated with

Also associated with

Rating

Temperature sensor probe and sensor detection circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Temperature sensor probe and sensor detection circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Temperature sensor probe and sensor detection circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1703702