In this paper, a reconfigurable non-isolated buckboost (BB) integrated full-bridge series resonant converter (FBSRC) based LED driver is proposed for wide input voltage automotive lighting applications. The proposed LED driver is derived by the integration of BB operation with FBSRC. It can be reconfigured into three different resonant converter topologies such as BB integrated FBSRC, BB integrated half-bridge series resonant converter (BB-HBSRC) and conventional HBSRC and hence produces 3 levels of voltage gains. By transformation from one topology to other based on the input voltage range and with APWM control, it can operate for wide input voltage range while maintaining the soft switching. The main advantages of the proposed configuration are smooth transformation into 3 different topologies without any additional switching devices, no topological transitions within a switching cycle in steady state, use of simple PI controller, soft switching and wider voltage gain with buck/boost operation. In addition, dimming control is also achieved using PWM technique. Detailed theoretical analysis of the proposed converter is presented. To verify the analysis and performance, a prototype of 22.7 W, 22.5 V LED driver is designed, simulated and tested for a wide input voltage range of 18 V to 120 V.

Induction heating (IH) is a trending technology in the domestic applications due to its advantages related to high efficiency, better control, and fast heating. Present research focuses on developing cost-effective and highly efficient solutions. In this article, a three-switch inverter (3SI) for multiple load IH applications is proposed, which meets previous requirements. Reduced component count and high efficiency are the key benefits of the proposed inverter. Asymmetric duty cycle control is used to obtain independent control over two loads simultaneously. The operation of the proposed 3SI has been verified by rigorous simulations in Orcad PSpice software and by experimenting with designed hardware prototype. The simulation and experimental results are in good agreement with each other, proving the proposed 3SI as a feasible solution for multiple load IH applications.

This paper proposes a soft-switched paralleled boost converter based LED driver for street lighting application. Output of paralleled boost converter (BC) in the form of full-bridge feeds a buck-boost converter (BBC). The outputs of paralleled BC and BBC are added to power LED lamps. The paralleled boost converters help in reducing the source current ripple with small inductors and also can handle large power. Regulation of the load voltage is achieved by BBC which handles small power without significantly affecting the overall efficiency. Soft switching of the devices in boost converters is achieved with a ZVS inductor resulting in high efficiency. PWM based dimming control is employed. The LED driver can be fed from batteries, ultra-capacitor, etc. A prototype of 65 W DC-DC converter for LED lighting is developed. The experimental results are in good agreement with simulation results. The proposed converter offers high efficiency of 93.42%, reduced source current ripple, and dimming control. The efficiency of the proposed converter with SiC MOSFETs is around 95% at all voltage variations.

In heating applications, induction heating (IH) is a dominant technology in the market due to several advantages over conventional heating techniques. Most of the research in the past has focused on heating ferromagnetic material type vessels. Now, there is an increase in research for proposing topologies suitable for heating ferromagnetic (FM) and Non-ferromagnetic (N-FM) type vessels. In this paper, an inverter circuit is proposed for heating FM and N-FM material vessels. A simple ON-OFF control is used for obtaining simultaneous as well as independent control for both the loads. It offers linear power control. The range of power control for N-FM load is increased by using frequency based control. The proposed inverter circuit has been simulated in OrCAD PSpice and experimentally verified with a prototype for 1624 W. It offers a peak experimental efficiency of 94.3%. It can also be extended for multiple loads by adding a low frequency operated switch and a diode combination for additional IH load. A detailed loss analysis for the proposed inverter has been carried out using PSIM software. The simulation and experimentation results are in good accord with each other. Hence, the proposed inverter circuit is a suitable solution for heating FM and N-FM material vessels for multi-load applications.