The immittance converter is the combined word for the impedance-admittance converter. The immittance converter has an input impedance that is proportional to the admittance of the load connected across output terminals. In this converter, the output current is proportional to the input voltage and the input current is proportional to the output voltage. Consequently, it converts a constant voltage source into a constant current source and a constant current source into a constant voltage source.
It is well known that the quarter-wavelength transmission line shows immittance conversion characteristics. However, it has very long line length for the switching frequency, and is not suitable for power electronics applications. So we proposed immittance converters that consist of lumped L, C and shows improved immittance conversion characteristics at a resonant frequency.
An immittance converter operates at the resonant frequency and is suitable to be inserted into high-frequency link of a power electronics system. Applications of the immittance converter are a utility interactive inverter for photovoltaic system and a non-contact energy transfer system etc.
A constant-current DC power supply is proposed in this paper. It can be simply realized by using a high frequency voltage source, an immittance converter and a rectifier. In this paper, circuit operation, characteristic equations and results of simulation with a sinusoidal voltage input are described.
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