Principle of human body sensing switch

Probe domestic switch needle KG-300K needle head diameter is 3.0mm normally open switch needle

One-piece inductor

Guide: The human body Sensor switch, as its name implies, controls the state of the switch according to the presence of human beings. Nowadays, the most common one is the voice-activated switch. I believe many of my friends are deeply impressed by the degree of insensitivity. If you switch to a human-sensing switch, you can greatly facilitate our lives. In addition, in conference rooms, basements, restrooms, etc. The place is also suitable to install such a switch, then follow the small series to understand the principle of the human body sensor switch ~

First, the principle of human body sensing switch - - Introduction

The human body sensor switch, the English name is PIR Motion Sensor Switches, also known as infrared smart switch, pyroelectric body sensor switch, is a switch that can automatically recognize the presence of human beings to replace the switch state. When there is a human being in the sensing range, its switch is in an open state, and when the human leaves the sensing range for a period of time, it automatically switches the state to the off state. The human body sensor switch mainly utilizes the principle of infrared induction to identify infrared rays of a specific wavelength emitted by human beings, and has the characteristics of simple structure, good performance and high precision.

Second, the principle of human body sensing switch

The human body sensor switch is mainly composed of a human body pyroelectric infrared sensor. Since the body temperature is constant, the infrared wavelength emitted by the body is constant. When the probe of the infrared sensor receives the infrared rays released by humans, it is focused on the pyroelectric element by the Fresnel lens, the charge balance on the element is broken, and the charge is discharged outward, and the circuit connected to the infrared sensor passes through When the charge is detected to be human, the control switch is in the "on" state to complete the human body induction. When the human is away for a period of time, the switch will remain in the "on" state, and after the set delay time, the infrared sensor does not sense the presence of humans, and the switch state is switched to "off".

Third, the principle of human body sensing switch - application

1. Light switch for use in conference rooms, corridors, basements, etc., when people turn on the lights and people turn off the lights, it can avoid waste of resources.

2, for the disinfection switch of the disinfection room, the person to switch off, in the non-sterilization state, the person to open the switch to open, in a disinfected state, can be very good to avoid the harm of disinfection products to the human body;

3, used in hotels, hotels and other places, replacing the existing card to take power, to add modern, personalized elements;

...

Pseudo-inductive switch principle related articles