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This paper presents the topology selection, design and experimentation of LCC resonant converter with isolated transformer for constant current source. Possible LCC topologies are classified based on the number of elements contribute to the dynamical change in energy. Topologies suitable for constant current source are selected based on the source/sink combination. The current gain transfer function is obtained for the selected topologies using sine-wave approximation method. The LCC resonant converter behaving as a constant current source when operated at a particular resonant frequency is selected. The expressions for converter current gain, component stresses, and the condition for optimized converter design for minimum size of resonant tank is derived. Experimental results of the converter show that Zero-voltage switching is achieved and is suitable for constant current power supply.

Analysis, design and experimentation of series-parallel LCC resonant converter for constant current source