Detector for magnetic field and method thereof
A detection device and detection method technology, applied in the detection field, can solve the problems of increased circuit cost, sensitive directionality, complex processing circuit, etc., and achieve the effects of simple circuit, flexible setting and low cost
Active Publication Date: 2012-04-18
SHENZHEN KAIFA TECH (CHENGDU) CO LTD
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Problems solved by technology
[0003] The current magnetic field detection is usually realized by reed switch, Hall sensor element, etc., but the detection effect is not ideal
Among them, the reed switch is very sensitive to the directionality of the magnetic field, and since the reed switch is a switch output, the sensitivity is not easy to control
The Hall sensing element also has the problem of being too sensitive in direction, and cannot detect accurate magnetic field strength values in certain directions and angles, so that the detection device cannot accurately detect the possible presence of an externally strengthened magnetic field.
If multiple Hall devices are used to detect the magnetic field strength values in different directions, the processing circuit will be very complicated, and the cost of the circuit will increase accordingly
Method used
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[0027] figure 1 It is a schematic diagram of the structure of the magnetic field detection device of the present invention. like figure 1 As shown, the magnetic field detection device introduced in the present invention mainly includes a pulse generator 1 , a pulse driver 2 , a voltage converter T and an output rectifying and filtering unit 3 . Wherein, the pulse generator 1 can be generated by an oscillator circuit, a dedicated IC (integrated circuit) circuit or software for pulse generation; the pulse driver 2 further includes a first transistor Q1, a second transistor Q2, a bias resistor R2 and a DC power supply DC , as an option, the pulse driver 2 may further include a first resistor R1 for limiting current. The function of the pulse driver 2 is to amplify the AC current generated by the pulse generator 1, that is, when the pulse generator 1 outputs a high level, the first transistor Q1 is turned on, and the amplified current is output at its emitter. 1 When the output...
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The invention discloses a magnetic field testing device, which comprises the following parts: pulse generator, voltage transformer, output commutation and filter unit, wherein the original winding of voltage transformer is connected on the pulse generator; the secondary winding of the voltage transformer is connected on the output commutation and filter unit. The invention also provides a magnetic field testing method to judge whether the external magnetic field exists through the output signal generated by voltage transformer, which is flexible to set the input driving signal without blind testing angle in the testing course.
Description
technical field [0001] The present invention relates to detection technology, and more particularly, to a magnetic field detection device and method. Background technique [0002] The externally strengthened magnetic field may affect the normal operation of the product. For example, placing magnetic devices (such as electromagnets) around metering equipment such as electricity meters and gas meters or strengthening the externally enhanced magnetic field generated by increasing the current to the coil will cause the metering equipment to work abnormally or stop working. related unit losses. Therefore, many products need to be equipped with magnetic field detection devices. [0003] The current magnetic field detection is usually realized by reed switches, Hall sensing elements, etc., but the detection effect is not ideal. Among them, the reed switch is very sensitive to the directionality of the magnetic field, and because the reed switch is a switch output, the sensitivity...
Claims
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IPC IPC(8): G01R33/02
Inventor 李长波王龙和何乐涛
Owner SHENZHEN KAIFA TECH (CHENGDU) CO LTD