Equivalent circuit of inductance element, method of analyzing circuit constant, circuit constant analysis program, device for analyzing circuit constant, circuit simulator

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.