Patent ID: 8620612
Filing Date: 2013-12-31
Classification: G01R,G06F

Abstract:
1. A circuit constant analysis method for an inductance element for analyzing circuit constants of an equivalent circuit of the inductance element, said equivalent circuit including: a parallel circuit connecting in parallel an inductance Ls, a capacitance Cp, and a resistance Rp; a capacitance Cr connected in series to said resistance Rp; an inductance Lr connected in parallel to said resistance Rp; a resistance Rs connected in series to said parallel circuit; a plurality of closed circuits including a resistance Rmi and an inductance Lmi magnetically coupled with a coupling coefficient ki by a mutual inductance Mi to said inductance Ls; and a resistance Rc connected in series to said capacitance Cp, the circuit constant analysis method comprising executing the following steps via a processor: determining a value of said resistance Rs from a measured value of DC resistance of the inductance element; determining a value of said inductance Ls from a measured value of the impedance when the impedance of said inductance element becomes nearly equal to the reactance; determining a value of said resistance Rp by measurement of the resistance of said inductance element at a resonance point; determining a value of said capacitance Cp from an actually measured value of a resonance frequency; determining a value of said inductance Lr from an increase of the resistance part of the impedance of said inductance element; determining a value of said capacitance Cr from a frequency at which said reactance part of said inductance element becomes maximum; determining values of said inductance Lmi and said resistance Rmi from a frequency of inflection of the Q value at a frequency less than or equal to said resonance frequency; determining a value of said coupling coefficient ki based on said determined frequency of inflection of the Q value at a frequency less than or equal to said resonance frequency, and based on said actually measured the Q value at said determined frequency; and determining a value of said resistance Rc from an actually measured value of the Q value at a frequency greater than or equal to the resonance frequency.