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Low Power Operating Method of Wireless Passive Infrared Detector to prolong lifetime of Battery and Low Power Operating System thereof
Low Power Operating Method of Wireless Passive Infrared Detector to prolong lifetime of Battery and Low Power Operating System thereof
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机译:无线无源红外探测器的低功耗工作方法及其延长电池寿命的低功耗操作系统
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摘要
Provided is a low power operating method for prolonging lifetime of a battery in a wireless passive infrared (PIR) sensor and a low power operating system using the same. The low power operating system for prolonging lifetime of a battery in a wireless PIR sensor comprises: a PIR element sensing an object, an amplifier amplifying an electrical output signal from the PIR element, a window comparator receiving the output signal from the amplifier, and outputting a square wave when the received output signal has a predetermined voltage or higher, an A/D converter receiving the amplifier output signal and being controlled by an MCU, a temperature sensor sensing and outputting a temperature of ambient air, a second A/D converter receiving an output from the temperature sensor and being controlled by the MCU, and the MCU receiving an output from the window comparator, recognizing the received output as a reliable input in a case where the output is received as having a voltage equal to or higher than a preset voltage of 50 ms by considering ambient temperature, RF noise, and the like, and controlling the A/D converter to operate to determine whether a person has trespassed, and controlling the second A/D converter to operate to receive an output from the temperature sensor at every wake-up time repeated for every 30 minutes or one hours to change the preset voltage according to a change in an ambient temperature to compensate for a temperature.
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