KR950012048A - Pyroelectric Sensor Self Diagnosis Circuit and Method - Google Patents

Abstract

A pyroelectric sensor, an amplifier for amplifying and filtering the pyroelectric sensor output, a comparator for generating an object detection signal when the amplification and filtering signals are compared with a predetermined reference value and generating an object detection signal; A circuit having a recognition unit for recognizing the appearance of an object as an input, the circuit comprising a voltage control unit between the pyroelectric sensor and the recognition unit, the voltage control unit in response to the self-diagnosis start signal generated at a predetermined period in the recognition unit Provides a pyroelectric sensor self-diagnosis circuit configured to momentarily cut off the voltage supplied to the pyroelectric sensor, and to recognize the state of the device as an object detection signal generated by the object detection signal.

In the pyroelectric sensor self-diagnosis method comprising a pyroelectric sensor, a microcomputer and a voltage control drive section for temporarily blocking a voltage supplied to the pyroelectric sensor in response to a pulse signal generated from the microcomputer. A first process of setting the feedback detection value, a second process of analyzing the object detection signals input from the first and second ports of the microcomputer, and confirming whether the object is detected by the object; When detecting an object less than the value, check whether the 1 pulse generation period is reached, and if the 1 pulse generation period is reached, a third process of generating 1 pulse to the third port of the microcomputer, and inputting the first and second ports to the microcomputer again after the generation of the 1 pulse. If the object detection signal is smaller than the initial set feedback detection value, the pyroelectric sensor consisting of the fourth step of determining that the device is not normal and generating an alarm It provides a self-diagnosis method.

Description

Pyroelectric Sensor Self Diagnosis Circuit and Method

Since this is an open matter, no full text was included.

1 is a block diagram of an object detection circuit using a pyroelectric sensor,

2 is a configuration diagram of the super-type sensor self-diagnosis circuit according to the present invention,

3 is a flowchart illustrating a pyroelectric sensor self-diagnosis process according to the present invention;

4 is an operating waveform diagram when power is turned on.

Claims (5)

A pyroelectric sensor, means for amplifying and filtering the pyroelectric sensor output, means for generating an object detection signal when the amplification and filtering signals are compared with a predetermined reference value and above the reference value, and as an input of the object detection signal. A furnace having recognition means for recognizing the appearance of an object, comprising: connecting a voltage control means between the pyroelectric sensor and the recognition means, and controlling the voltage in response to a self-diagnosis start signal generated at a predetermined period in the recognition means. And a means for instantaneously interrupting the voltage supplied to the pyroelectric sensor, and the recognition means for diagnosing the state of the device as an object detection signal generated thereby. 2. The pyroelectric sensor self-diagnosis circuit according to claim 1, further comprising an alarm means for alarming a device failure in response to the diagnosis result. 2. The pyroelectric sensor magnet according to claim 1, wherein the voltage control means is a transistor having a collector connected to a power input column of the pyroelectric sensor and a base connected to a self-diagnosis start signal output terminal of the recognition means. Diagnostic circuit. 4. The pyroelectric sensor self-diagnosis circuit according to claim 3, wherein the self-diagnosis start signal is a one-pulse signal that remains high for several ms. A pyroelectric sensor self-diagnosis method of a circuit having a pyroelectric sensor, a microcomputer, and a voltage control drive factor to temporarily block a voltage supplied to the pyroelectric sensor in response to a pulse signal generated from the microcomputer. A first process of setting the feedback detection value, a second process of analyzing the object detection signals input from the first and third ports of the microcomputer, and confirming that the object is actually detected, and the water detection value is not detected or the human body detection value In the case of detecting less than one object, the first pulse generation period is checked. If the first pulse generation period is reached, the third process of generating one pulse to the third port of the microcomputer, and the microcomputer is inputted to the microcomputer first and second ports after the first pulse generation. If the object detection signal is smaller than the initial set feedback detection value, it is determined that the device is not normal, and a fourth process of generating an alarm is made. Pyroelectric sensor self-diagnosis method. ※ Note: The disclosure is based on the initial application.