An Inductance Measuring Device Based on Resonance Principle

A technology of inductance measurement and inductance, which is applied in the field of measurement, can solve problems such as the measurement accuracy of ordinary resonance methods, and achieve the effects of reducing measurement costs, easy popularization, and simple circuit structure

Inactive Publication Date: 2019-05-10
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In order to avoid the deficiencies of the prior art, the present invention proposes an inductance measurement device based on the principle of resonance, which does not need to use frequency-adjustable AC signal sources and high-peak detection circuits, and solves the problem of measurement accuracy of ordinary resonance methods. Compared with the bridge method and the impedance phase angle method, the measurement circuit of this method is very simple, the measurement process is very fast, the measurement cost is reduced and the measurement efficiency is improved.

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  • An Inductance Measuring Device Based on Resonance Principle

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Embodiment Construction

[0013] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0014] Using two identical MOS tubes, RFC is an inductive choke coil, which is equivalent to a constant current source, L 3 is the inductance to be measured. Diode D 3 ,D 4 The existence of these two MOS tubes makes the two MOS transistors work in a complementary state. At the same time, one is in the on state, and the other is in the off state. D. 1 ,D 2 is the parasitic diode of the MOS tube, C 1 , C 2 It is the sum of the parasitic output capacitance of each MOS transistor and the parallel capacitance of the drain and source in the circuit. When Q 1 tube off, Q 2 When the tube is turned on, C 2 The voltage across both ends is zero, C 1 , C 3 and L 3 Parallel resonance occurs. When Q 1 tube open, Q 2 tube off, C 1 The voltage across both ends is zero, C 2 , C 3 and L 3 Parallel resonance occurs. Order C 1 =C 2 , during resonance, C 1 , C...

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Abstract

The invention relates to an inductance measurement device based on the resonance theory. An inductor to be measured and a capacitor in a circuit form a parallel oscillation system, the work frequency of an inverter circuit is automatically kept consistent with the oscillation frequency of the parallel oscillation system, no matter how high the magnitude of the to-be-measured inductor is, the parallel oscillation system is in a resonant state all the time, the mistermination problem of inductance measurement of a resonance method is solved, a frequency-adjustable alternate-current drive signal and resonance detecting device does not need to be used, and the whole circuit is simple in structure, low in design cost and easy to popularize.

Description

technical field [0001] The invention belongs to the technical field of measurement and relates to an inductance measurement device based on the resonance principle. Background technique [0002] With the development of the electronics industry, people have higher requirements for the measurement occasions, measurement accuracy, measurement cost and difficulty of measurement methods of electronic components. Inductance components have been widely used in oscillation, filtering, delay, notch and other occasions. At present, there are many inductance measurement methods. The common ones are AC bridge method, impedance phase angle method and resonance method. They have their own advantages and disadvantages. The principle of measuring inductance by AC bridge method is the same as that of measuring resistance by Wheatstone bridge method. There are four bridge arms. AC power is used during the measurement process. By adjusting one of the four bridge arms, the bridge is balanced. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R27/26
CPCG01R27/26
Inventor 王尧皇甫宜耿
Owner NORTHWESTERN POLYTECHNICAL UNIV
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