Human-body infrared induction device

Abstract

The invention provides a human-body infrared induction device. A thermopile chip converts infrared radiation energy of the human body into a continuously output voltage signal, a thermistor chip forms a voltage dividing signal in a circuit loop, an induction module body processes the voltage signal and the voltage dividing signal, whether the thermopile chip and the thermistor chip include a temperature difference caused by infrared radiation is calculated according to the voltage signal and the voltage dividing signal, and whether the human body exists in the surrounding is determined. Use of a time-delay control chip of low flexibility and pre-estimation of a time delay parameter are avoided, the human body induction accuracy and the using convenience are improved, a bright / dark-field Fresnel lens chopping device is not needed, the complex degree of the module is reduced, and the reliability is improved.

Description

technical field [0001] The invention relates to the technical field of infrared detection, in particular to a human body infrared sensing device. Background technique [0002] In the traditional pyroelectric infrared human body sensing module, a delay control chip is usually used to realize the continuous operation of lamps, automatic doors and other peripherals within a certain continuous period of time. Due to the uncertainty of lighting time, automatic door opening time, faucet running time, etc. required by people's activities in specific actual scenarios, and the delay parameter of the delay control chip depends entirely on the size of the delay capacitor, so the pyroelectric infrared human body Once the sensor module is installed, it is difficult to adjust the delay parameters. If the delay is too long, it is not conducive to energy saving, environmental protection and automatic control. If the delay is too short, it is easy to switch peripherals frequently, which will...

AI Technical Summary

Problems solved by technology

Due to the uncertainty of lighting time, automatic door opening time, faucet running time, etc. required by people's activities in specific actual scenarios, and the delay parameter of the delay control chip depends entirely on the size of the delay capacitor, so the pyroelectric infrared human body Once the sensor module is installed, it is difficult to adjust the delay parameters. If the delay is too long, it is not conducive to energy saving, environmental protection and automatic control. If the delay is too short, it is easy to switch peripherals frequently, which will cause inconvenience to people's activities and affect the working life of peripherals.

At the same time, the pyroelectric infrared human body sensing module also needs to be equipped with a bright and dark field Fresnel lens chopper device to generate an alternating "blind zone" and "visible zone" in front of the sensor. The emitted infrared radiation will be intermittently received by the pyroelectric element, so that the polarity of its charge is continuously switched, and a pulse signal can be output, so it cannot detect the infrared radiation signal of the human body that is still or has a small range of motion.

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