Coupling coefficient detection circuit among magnetic coupling inductance coils and method thereof

Abstract

The invention belongs to the coupling coefficient detection technology field among inductance coils and provides a coupling coefficient detection circuit among magnetic coupling inductance coils and a method thereof. The circuit and the method are used to overcome defects that an existing detection method is complex; a calculating expression is not unique and an error is large. The detection circuit comprises a direct voltage power supply, an inverter, a primary series capacitor, a primary variable trimming resistor, a primary inductance coil, a secondary inductance coil, a secondary series capacitor, a secondary variable trimming resistor and a detection resistor. The direct voltage power supply is connected to two input terminals of the inverter. The primary variable trimming resistor, the primary series capacitor and the primary inductance coil are successively connected and then are connected to two output terminals of the inverter so as to form a primary resonance loop. The secondary inductance coil, the secondary series capacitor, the secondary variable trimming resistor and the detection resistor are successively connected so as to form a secondary resonance loop. The detection circuit is simple and is convenient for constructing. An analytical expression of a coupling coefficient is accurate and high-efficient.

Description

technical field [0001] The invention belongs to the technical field of coupling coefficient detection between inductance coils, and relates to a coupling coefficient detection circuit and method for magnetically coupled inductance coils. Background technique [0002] The detection of the coupling coefficient between the existing magnetically coupled inductor coils is usually expressed by a numerical expression, and the numerical solution of the coupling coefficient is obtained. First, the integral formula of the mutual inductance coefficient is derived by using the Biot-Savart law, and then the numerical calculation is performed. Analyze the situation and guess the non-extreme situation, use power series, exponent, logarithm or their combination to test, and then use numerical calculation to verify, and finally try to deduce that the two coils are at any distance (except that the two inductance coils are almost Approximate analytical expressions for mutual inductance and cou...

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Problems solved by technology

[0003] The purpose of the present invention is to provide a coupling coefficient detection circuit and method between magnetically coupled inductor coils for the existing magnetically coupled inductor coil coupling coefficient detection method is complicated, the calculation expression is not unique, and the error is relatively large; The technical solution is:

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