Temperature sensing circuit using thermopile sensor
AssigneeLG Electronics Inc.
InventorsKoon Seok Lee, Jeong Hyun Lim
Life of this patent
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Abstract
A temperature sensing circuit using a thermopile sensor is provided which includes a thermopile sensor generating a voltage corresponding to an incidence amount of infrared rays, means for amplifying the output of the thermopile sensor, means for compensating for an offset of the amplifying means, and means for removing the output of the offset compensating means from the output of the amplifying means, to detect the temperature of an object.
Claims25
A temperature sensing circuit using a thermopile sensor, comprising:
- a thermopile sensor generating a voltage corresponding to an incidence amount of infrared rays;
- means for amplifying the output of the thermopile sensor;
- means for compensating for an offset value of the amplifying means;
- and
- a micro-computer for adjusting the output of the amplifying means based on the offset value, to detect the temperature of an object.
A temperature sensing circuit using a thermopile sensor, comprising:
- a thermopile sensor generating a voltage corresponding to an incidence amount of infrared rays;
- surrounding temperature compensating means being placed adjacent to the thermopile sensor, for generating a compensation voltage for removing the effect of surrounding temperature;
- means for amplifying the output of the thermopile sensor using the compensation voltage generated by the surrounding temperature compensating means as a reference voltage;
- and
- offset compensating means for controlling the reference voltage of the amplifying means according to an offset of the amplifying means.
A temperature sensing circuit using a thermopile sensor, comprising:
- a thermopile sensor generating a first voltage corresponding to an incidence amount of infrared rays;
- surrounding temperature compensating means for generating a second voltage corresponding to a variation in the surrounding temperature of the thermopile sensor;
- amplifying means for amplifying the first voltage using the second voltage as a reference voltage;
- and
- offset compensating means being composed of a first offset compensator, connected between a power supply terminal and reference voltage terminal, for compensating for an offset of the amplifying means and a second offset compensator, connected between the reference voltage terminal and a ground terminal, for compensating for the offset of the amplifying means, the offset compensating means controlling the second voltage selectively using the first or second offset compensator according to a level of the offset of the amplifying means.
A temperature sensing circuit using a thermopile sensor, comprising:
- a thermopile sensor generating a voltage corresponding to an incidence amount of infrared rays;
- means for amplifying the output of the thermopile sensor, the amplifying means uses a first voltage varying with a surrounding temperature as a reference voltage;
- means for generating a second voltage corresponding to an offset value of the amplifying means;
- and
- micro-computer detecting a temperature of an object by subtracting the second voltage from the first voltage.
A temperature sensing circuit comprising:
- a sensor that generates a first signal indicative of a temperature of a target object;
- a temperature compensator that outputs a second signal indicative of ambient temperature;
- an amplifier having a prescribed offset value and having first and second inputs and an output, the first input coupled for receiving the first signal and the second input being coupled for receiving the second, said amplifier amplifying the first signal of the sensor using the second signal of the temperature compensator as a reference signal;
- and
- an offset circuit that compensates for the prescribed offset value of said amplifier.
Dependencies are inferred from the claim text.