Another disadvantage of the parallel-resonant inverter topology is that the output current of the inverter (7S) is relatively constant from full-load to no-load. Therefore the conversion efficiency suffers adversely as the load decreases from full-load to no- load. This makes the inverter unsuitable for pulse power loads. The advantage of this inverter is that it has a self current limiting capability against an output short circuit. This makes the parallel inverter suitable for the applications with severe short circuit requirements. 3.4.2 Series-Parallel Resonant Inverter. The main advantage of the series-parallel resonant inverter is that the output voltage is independent of the load. This simplifies the requirements of the control circuit and does not require a large value of parallel capacitor Cp. Since the series branch is tuned to the operating frequency of the inverter, the voltage gain is high. This results in low conduction losses and volt-ampere rating of the inverter switches. The converter maintains excellent efficiency from full-load to half-load and moderate efficiency at lower loads. The series-parallel inverter topology does not have self-current limiting capability for an output short circuiting. However, it is relatively simple to make the inverter short circuit proof as it takes many cycles before the current can rise dangerously. This gives enough time for control circuit to take corrective action. The main disadvantage of this circuit is that the conduction losses are relatively constant at lower output loads. Therefore, the inverter is not very attractive for pulsepower applications. This limits the use of this inverter for those applications where the ratio of peak power/average power demand is not very large (not greater than 3-4). 3.4.2 Hybrid Resonant Inverter. The hybrid resonant inverter topology has load independent output voltage and maintains an excellent efficiency from full-load to reduced load. The output current of the inverter and therefore the conduction losses decrease as the load is lowered.
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