INDUCTOR SIMULATION METHOD AND INDUCTOR NONLINEAR EQUIVALENT CIRCUIT MODEL

摘要

An inductor simulation method and nonlinear equivalent circuit model enabling dynamic simulation of nonlinear characteristics when a direct current is superimposed with high precision. An equivalent circuit of an inductor is represented using a series circuit of passive circuit elements. Characteristic change ratios of the passive circuit elements when a direct current is superimposed are expressed as an approximate function on the basis of actually measured values. A reference current measured by each of voltage source models is referred to by a control voltage source connected in series to the passive circuit elements. The characteristic change ratios are calculated in accordance with the reference current Iref. Difference voltages are generated on the basis of the characteristic change ratios and voltages occurring when no direct current is superimposed, they are superimposed on the voltages VL1 and VR1 occurring when no direct current is superimposed, thereby simulating the nonlinear characteristics.

主权项

1. An inductor simulation method for simulating nonlinear characteristics of an inductor, comprising:
representing an equivalent circuit of the inductor by using a passive circuit element; expressing a characteristic change ratio of the passive circuit element when a direct current is superimposed as an approximate function that uses a current as a variable, based on actually measured values; and referring to the current flowing in the inductor, generating a difference voltage between a voltage occurring in the passive circuit element when a direct current is superimposed and a voltage occurring in the passive circuit element when no direct current is superimposed, based on the characteristic change ratio calculated in accordance with the referred current by using the approximate function and based on the voltage occurring when no direct current is superimposed, by using a control voltage source connected in series to the passive circuit element whose characteristics are changed by the superimposition of a direct current, and superimposes the difference voltage on the voltage occurring when no direct current is superimposed, thereby simulating the nonlinear characteristics of the inductor when the direct current is superimposed.