FAQ

The Hall effect was discovered by Edwin Hall in 1879, which defines the relationship between the magnetic field and the induced voltage. If the biased Hall element is placed in a magnetic field with flux lines at right angles to the bias current, the voltage output changes in direct proportion to the magnetic field’s strength. As the magnetic field increases, the Hall voltage also increases. People call this voltage the Hall voltage. This phenomenon is called the Hall effect.

About 100 years after the discovery of the Hall effect, German physicist Klaus von Klitzing (1943-) discovered the integer quantum Hall effect while studying semiconductors in extremely low temperatures and strong magnetic fields. After that, Chinese Americans Physicist Cui Qi (Daniel Chee Tsui, 1939-), American physicists Laughlin (Robert B. Laughlin, 1950-) and Störmer (Horst L. Störmer, 1949-) study quantum in a stronger magnetic field The fractional quantum Hall effect was discovered during the Hall effect. The half-integer quantum Hall effect in graphene was discovered in 2005, and the quantized spin Hall effect was discovered in 2007. The quantum anomalous Hall effect makes it possible to apply the quantum Hall effect under zero magnetic field conditions. These effects may play a special role in future electronic devices and can be used to prepare low-energy high-speed electronic devices.

The Hall effect ICs made according to the Hall effect uses the magnetic field as the working medium to convert the motion parameters of the object into the form of digital voltage output, so that it has the functions of sensing and switching.

Hall-effect ICs combine Hall voltage generators, signal amplifiers, Schmitt trigger circuits, and transistor output cir­cuits on a single integrated circuit chip. The output is clean, fast, and switched without bounce.

We use The Hall effect ICs to monitor and measure position, displacement, angle, angular, velocity, rotational speed, pressure, quality, liquid level, velocity, and flow. By detecting changes in the magnetic field, Hall effect ICs convert them into electrical signal output.

You could find them in the following applications:

• ignition systems,
• speed controls,
• security systems,
• alignment controls,
• micrometers,
• mechanical limit switches,
• computers,
• printers,
• disk drives,
• keyboards,
• machine tools,
• key switches,
• pushbutton switches.

They are also used as tachometer pickups, current limit switches, position detectors, selector switches, current sensors, linear potentiometers, rotary encoders, and brushless DC motor commutators.

Hall effect ICs are small but essential. They contribute to simplify and improve electrical and mechanical systems.

• A Hall effect IC is used in the high accuracy, long time, and compact designs of various systems and costs less than many standard electromechanical switches.
• A Hall effect IC is contactless and magnetically activated, suitable for use under severe service conditions.
• A Hall-effect switch oper­ates typically at up to a 100 kHz repetition rate; it directly interfaces with the electronic control unit.

In a word, the hall ICs are sensitive and provide reliable, repetitive operation in close-tolerance applications.

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