OFweek smart home network hearing Hall sensor is a sensor that detects the magnetic field, can be used to detect the presence and change of the magnetic field.
Principle When an energized conductor is placed in a magnetic field, voltages are generated on both sides of the conductor. This phenomenon is called the Hall effect.
First, the conductor is passed through the current I in the illustrated direction (z-axis direction), and then the magnetic field B is applied in the direction perpendicular to the current (y-axis direction), then the voltage UH is generated on both sides of the conductor (x-axis direction). UH is called Hall voltage.
The metal conductor has a Hall effect, but its sensitivity is low, resulting in a low Hall voltage and unsuited to the Hall element. The Hall element is generally made of a semiconductor material (Indium telluride is the most common), and its structure is shown in the figure. It is composed of a substrate, a cross-shaped semiconductor material, an electrode lead, and a magnetic body tip. Among the leads at the four ends of the cruciate indium-telluride material, 1 and 2 are current pins, and 3 and 4 are voltage pins. The role of the top of the magnetic body is to gather the magnetic field lines of magnetic field to improve the sensitivity of the device.
Since the voltage generated by the Hall element is very small, the Hall element and the amplification circuit, the temperature compensation circuit, and the constant voltage power supply are usually integrated on one chip, which is called a Hall sensor.
Switch Hall sensors have the feature that the output voltage can only be level converted when the magnetic induction intensity reaches a certain intensity. It is mainly used to measure the number of revolutions, speed, wind speed, flow rate (outdoor intelligent measurement), or used in proximity switches, magnetic sensors, Alarms and automatic control circuits (indoor doors and windows).
Since AC power cord is output of high voltage electric power, there is a risk of electric shock injury, therefore, All the AC power cord must comply with safety standard to produce. AC (Alternating Current) Power cord is to transmit high voltage. It is used to drive machinery or home appliances.
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