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Classification of Hall switch

release time:2022-03-17Author source:SlkorBrowse:538

1. Unipolar Hall-effect switch (digital output)

Unipolar Hall-effect switches have a magnetic operating threshold (Bop). If the magnetic flux density experienced by the Hall cell is greater than the operating threshold, the output transistor will turn on; when the magnetic flux density falls below the operating threshold (Brp), the transistor will turn off. Hysteresis (Bhys) is the difference between two thresholds (Bop-Brp). This built-in hysteresis page enables net switching of the output even in the presence of external mechanical vibration and electrical noise. The digital output of the unipolar Hall effect can be adapted to various logic systems. These devices are ideal for use with simple magnetic rods or rods. The front and back sides of the unipolar Hall switch will have a magnetic pole induction function. In specific applications, attention should be paid to the installation of the magnetic poles of the magnet, otherwise it will cause unipolar non-inductive output.

2. Bipolar Hall-effect switch (digital output)

Bipolar Hall is further divided into bipolar non-latching Hall switch and bipolar latching Hall switch.

A bipolar Hall-effect switch typically opens with sufficient magnetic field strength at the South Pole and closes with a sufficient magnetic field strength in the North Pole, but if the field is removed, the output is random, either on or off. Bipolar latching Hall-effect switches typically open with a sufficient magnetic field strength at the South Pole and close with a sufficient magnetic field strength in the North Pole, but do not change the output state if the magnetic field is removed. These Hall effect switches can be magnetically actuated using alternating north-south magnetic fields, multi-pole ring magnets.

3. Bipolar latching Hall effect switch (digital output)

When it is placed in the n-pole (or s-pole), it will be turned on, and it will remain on after the magnetic field is removed; and it will only be turned off when it is placed in the s-pole (or n-pole), and it will continue to remain on or off after the magnetic field is removed. until the next magnetic field change. This feature of maintaining the last state is the latch feature, and this type of Hall effect switch is a bipolar latch type Hall effect switch.

4. Omnipolar Hall-effect switch (digital output)

Unlike other Hall-effect switches, these devices turn on as long as a sufficiently strong north or south magnetic field is present; in the absence of a magnetic field, the output turns off.

5. Linear Hall effect sensor IC (analog output)

The voltage output of a linear Hall-effect sensor IC precisely tracks changes in magnetic flux density. At static state (no magnetic field), the output should theoretically be equal to half the supply voltage over the operating voltage and operating temperature range. Increasing the South Pole magnetic field will increase the voltage from its static voltage. Conversely, increasing the North Pole magnetic field will increase the voltage from its static voltage. These components measure the angle, proximity, motion, and magnetic flux of current. They are able to reflect mechanical events in a magnetically actuated manner.

6. Micro-power Hall-effect switch (digital output)

With the popularization of portable devices such as mobile phones, notebook computers, and DVs, the power consumption of Hall ICs is required, resulting in a new class of Hall ICs. It is a separate category of digital Hall ICs based on power consumption. The internal sleep mechanism is used to reduce power consumption, and the average power consumption can reach uA level. It can also be divided into three types: single-stage Hall IC, locking Hall IC, and full-stage Hall IC according to function. This type of system is generally used for long-term battery powered systems.

What are the characteristic parameters of Hall switch? How to measure these characteristic parameters?

1. BOP, BRP (magnetic field on, off point) Operating temperature, operating voltage, maximum output current, temperature drift, mainly these.

2. Before leaving the factory, Hall will be tested by a professional testing machine to ensure the normality of these parameters. It is difficult to measure by yourself. For example, the working voltage is basically normal within the calibration range. If you want to perform a destructive test to test the extreme The value is set up a circuit and slowly increase the voltage to see when it breaks down.

3. Magnetic opening and closing points, temperature drift, etc. are difficult to measure without instruments, and are generally automated tests. There are two types of Hall sensors: switch output type and linear output type.

Switch type: When approaching a magnetic object, the switch is in a fixed state (or high level or low level); when away from the magnetic material, the switch is in another fixed state (or low level or high and low level) ; The sensitivity of the switch depends on the grade of the switch itself and the voltage of the power supply and the magnetism of the magnet. The sensitivity curve can be made by changing the supply voltage, the distance from the magnet, and the magnetism of the magnet.

Linear type: With the distance of the magnetic object, the output signal voltage of the sensor changes continuously. The farther the distance, the lower (or higher) the output. The practical curve can be made by referring to the method of the switch type.

Hall switches have several pins

Generally 3, one positive, one negative, one signal line, do you want a model, generally divided into self-locking type and non-self-locking type, I use 3144 or E44 more, familiar with it! 3144 is non-self-locking type, but it has a direction. When it is magnetic, the signal pin outputs the signal ground! Self-locking type plus positive magnetic pole output signal, reverse magnetic pole, the signal stops! The types of proximity switches include passive proximity switches, eddy current proximity switches, capacitive proximity switches,

Hall proximity switch, photoelectric proximity switch, pyroelectric proximity switch, etc.

Hall switch is a type of proximity switch.

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