(1) Series-Resonant Converter. (2) Parallel-Resonant Converter. (3) Series-Parallel Resonant Converter. The performance of each of the above topologies is studied with respect to the following features: (1) Full-load to no-load output voltage regulation. (2) Full-load to reduced load conversion efficiency. The following sub-sections present the behaviour and characteristics of each inverter. 4.3.1 Series-resonant Converter Topology. Figure 17 shows a series resonant converter topology. In this converter a quasi-square voltage is produced at the output of the full- bridge inverter using pulse width modulation. The series branch, which is tuned to the operating frequency of the converter, produces a sinusoidal current (Zs) at the output of the inverter. The rectification action of the output diodes converts the resonating current (Zs) into unidirectional current at the output of the rectifier. The rectifier current is filtered by an output capacitor Co to provide a DC output voltage. Figure 18 shows the operating waveforms of the series resonant converter.
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