Sensor circuit applied on range hood and range hood

Abstract

The invention discloses a sensor circuit applied on a range hood. The sensor circuit comprises a zero setting infrared reception module, a detection infrared reception module, a differential amplification module, an A / D acquisition module, a processor and a temperature acquisition module, wherein both the zero setting infrared reception module and the detection infrared reception module are connected with the processor through the differential amplification module and the A / D acquisition module in sequence; the processor is also connected with the temperature acquisition module; the temperature acquisition module is arranged in the vicinity of the detection infrared reception module and is used for acquiring the environment temperature of the detection infrared reception module; the performance of the zero setting infrared reception module and the detection infrared reception module is similar or same; and the differential amplification module comprises a differential amplification circuit and is used for counteracting the electric signal changes, generated by the environment, received by the zero setting infrared reception module and the detection infrared reception module. The sensor circuit is realizing the automatic zero setting of the circuit when the environment light or temperature changes, thereby reducing the deviation of the signals output by the circuit and correctlyreflecting the detection concentration.

Description

technical field [0001] The invention belongs to the technical field of smoke machine control circuits, and in particular relates to a sensor circuit applied to a smoke machine and the smoke machine. Background technique [0002] The traditional zeroing circuit is usually fixed zeroing, which is not enough for the infrared receiving tube affected by ambient light and ambient temperature. Different ambient light and ambient temperature will affect the output current of the infrared receiving tube, so that the fixed zeroing The method is meaningless; when the infrared receiving tube is affected by ambient light and ambient temperature, the detection range of the infrared receiving tube for the concentration of oil fume will be reduced, so that it cannot reach the proper detection range, thereby affecting the detection effect. Contents of the invention [0003] In view of this, the main purpose of the present invention is to provide a sensor circuit applied to a cigarette mach...

AI Technical Summary

Problems solved by technology

[0002] The traditional zeroing circuit is usually fixed zeroing, which is not enough for the infrared receiving tube affected by ambient light and ambient temperature. Different ambient light and ambient temperature will affect the output current of the infrared receiving tube, so that the fixed zeroing The method is meaningless; when the infrared receiving tube is affected by ambient light and ambient temperature, the detection range of the infrared receiving tube for the concentration of oil fume will be reduced, so that it cannot reach the proper detection range, thus affecting the detection effect

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