S Porpandiselvi

Single Inverter Configuration for Simultaneous Dual Frequency Induction Hardening with Independent Control

Summary Induction hardening is a heat treatment process which selectively heats parts of work-piece with different size and shape. Components like gears require different frequencies with inner core requiring low frequency and outer surface requiring high frequency. Simultaneous application of low and high frequency currents is desirable for proper hardening of gear. This paper proposes a two inverter topology with a load resonant circuit which can provide independent and simultaneous control of low and high frequency currents through the load coil. The load circuit is a combination of two series resonant circuits which operates at the desired low and high frequencies. Power control is achieved with phase modulation of low and high frequency inverters.

Hybrid controlled dual frequency inverter for two load induction cooking application

Abstract Induction heating applications have become more popular due to its advantages like non-contact heating, environment friendly and high efficiency. In this paper, a two load induction heating system is proposed for cooking applications. A single full-bridge inverter is powering the loads at two different frequencies. These loads are controlled independently and simultaneously. The prototype has been built and tested for 115 W of low frequency and 60 W of high frequency power. Phase shift control and pulse density techniques are used for power control. Experimental results presented are in good agreement with simulation results.

A three-output inverter for induction cooking application with independent control

Abstract In Induction Heating (IH) cooking appliances more than one output is highly desirable. A three leg inverter is proposed for three output IH cooking application. It is operating with a constant frequency of 30.5 kHz and allows the power control in loads independently. On-off control technique in cyclic manner is used. The number of switching devices per load is two (i.e. one leg per load). Thus utilization of the switching devices is improved. It can be extended for more number of loads also. A 260 W prototype has been implemented. Experimental results have good agreement with the simulation results.

ADC controlled parallel loaded resonant half-bridge converter for LED lighting

In this paper, a half-bridge parallel resonant converter based LED driver is proposed. ADC control is employed. It operates with ZVS and hence switching losses are reduced. It provides dimming control in LED loads and regulates LED current against input voltage variation. With reduced current ripple, it offers the advantage of eliminating electrolytic capacitor and life span of LED driver is increased. The detailed description, circuit analysis and simulation results of the proposed converter are presented.