Resonant inverters are widely used in induction heating applications. Series Resonant Inverter (SRI) fed with voltage source is very much reliable, cost-effective and provides various power control techniques. Different power control schemes like phase shift control (PSC), asymmetrical duty cycle (ADC) control, asymmetrical voltage cancellation (AVC) control, pulse density modulation (PDM) control are normally used at SRI for high frequency induction heating. In this paper a new hybrid control technique by combining PSC and PDM is analyzed. The new control technique overcomes the drawback of individual scheme and provides a wide range of power control. The analyses of all the control techniques are verified through MATLAB simulation results
This paper presents the comparative study of multiple output inverter topologies in terms of their circuit operation, control techniques, output power, number of switches required and their efficiency. It includes the concept of multi-output inverterfor IH applications. Two multi-output topologies are explained for high power and low power applications. These topologiesallowhigher efficiency, low cost and less switching losses as compared to other multiple output techniques such as paralleled power converters and loadmultiplexationtechnique.The control strategy includes asymmetrical voltage cancellation (AVC), Variable frequency duty cycle (VFDC) and Pulse density modulation (PDM) control techniques. The performance of multiple-output inverter topologies is verified using MATLABSimulink.
For medium voltage and high power applications, multilevel inverter has been accepted as a better alternative; as it has better waveform quality, low stresses on switching devices and better performance. Among the various topology of multi level inverter cascaded H-bridge inverter has been found as more reliable, easy to implement and better performance. This paper analyses the performance of cascaded H-bridge inverter for 5level, 7-level, 9-level, 11-level, 13-level and 21-level for single phase and also three phases. The performance of mentioned level has been analyzed through simulation using level-shift PWM technique i.e. for all the levels using In Phase Disposition, Phase Opposition Disposition and Alternate Phase Opposition Disposition. A comparison between total harmonic distortions at modulating frequency 1 KHz and 4 KHz for all levels has been done for various methods of level shifted PWM techniques.
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