Hall sensor is a kind of magnetic field sensor based on Hall effect, which is widely used in industrial automation technology, detection technology and information processing. The hall coefficient measured by Hall effect experiment can judge the important parameters such as conductive type, carrier concentration and carrier mobility.
Because the potential difference produced by Hall element is very small, Hall element is usually integrated with amplifier circuit, temperature compensation circuit and regulated power supply circuit on one chip, which is called Hall sensor.
Many people know that the higher the degree of automation of cars, the more microelectronic circuits, the more afraid of electromagnetic interference.However, there are many lamps and electrical appliances in the automobile, especially the high-power headlamp, air-conditioning motor and wiper motor, which will produce surge current when switching, which will make the mechanical switch contact produce arc and produce large electromagnetic interference signal.
These phenomena can be reduced by using power Hall switch circuit.The hall device can be used to monitor and measure the changes of the operating parameters of various parts of the car by detecting the change of magnetic field and transforming it into electrical signal output.
For example, position, displacement, angle, angular velocity, rotational speed, etc. these variables can be transformed twice; pressure, mass, liquid level, flow rate, etc. can be measured.The output of hall device is directly connected with electronic control unit to realize automatic detection.
At present, all hall devices can withstand certain vibration, and can work in the range of - 40 ℃ to 150 ℃ above zero. All seals are free from water and oil pollution, and can fully adapt to the harsh working environment of automobiles.
Hall sensor can measure any waveform of current and voltage, such as: DC, AC, pulse waveform, and even the measurement of transient peak value.The secondary current faithfully reflects the waveform of primary current.It can not be compared with the common sine wave transformer
There is good electrical isolation between the primary circuit and the secondary circuit, and the isolation voltage can reach 9600vrms;
High precision: the accuracy is better than 1% in the working temperature area, which is suitable for any waveform measurement; Hall switch device has no contact, no wear, clear output waveform, no jitter, no bounce, high position repetition accuracy (up to μ m level).
Broadband width: the rise time of current sensor with high bandwidth can be less than 1 μ s; however, the bandwidth of voltage sensor is narrow, generally within 15KHz; the rise time of high voltage voltage sensor with 6400vrms is about 500us and the bandwidth is about 700Hz.
Up to 50kA, wide measurement range.
Solid structure, small size, light weight, long service life, easy installation, low power consumption, high frequency (up to 1MHz), vibration resistance, not afraid of dust, oil, water vapor and salt spray pollution or corrosion.