Abstract
In recent years, induction heating (IH) applications aided by electronic power control have gained significance. Particularly, for cooking applications, an appropriate control technique is required to feed power from a single source to multiple loads with minimum switching losses. Additionally, when multiple loads are used, it requires independent control and operation for each of the loads. The main idea of this work is to develop a single-stage AC-AC converter topology to feed power to multiple loads independently with a single source, with a reduced number of switching devices and with minimum switching losses. The proposed topology uses a frequency bifurcation concept to feed power to multiple loads by placing the transmitting coil and work coil at a distance of 3 cm. The source is resonated at a 25 kHz switching frequency, with the designed bifurcated frequencies of 20 kHz and 33 kHz. The resonant capacitors are appropriately chosen to operate at those frequencies. For real-time applications, simultaneous and independent power control are inevitable in multi load-fed IH applications. This is achieved through a pulse density modulation scheme with minimum switching losses. The simulation of the proposed system is performed in MATLAB/Simulink, and also the 1 kW system is validated using a PIC16F877A microcontroller. The real-time thermal variation in the load is also recorded using a FLIR thermal imager. The experimental and simulation results are observed, and the obtained efficiency of the system is plotted for various duty cycles of pulse density modulation control.
Highlights
In the new era, domestic Induction Heating applications are replacing the traditional electric and gas heating technology
The induction heating system has the inherent benefits of higher conversion efficiency with a lower time constant to achieve the required cleaner heating
Phase Shift Control (PSC) is constant frequency control, in which output power control is performed by adjusting the phase shift of the inverter pulses [17,18]
Summary
Domestic Induction Heating applications are replacing the traditional electric and gas heating technology. Phase Shift Control (PSC) is constant frequency control, in which output power control is performed by adjusting the phase shift of the inverter pulses [17,18] Though this method possesses smooth power control without an EMI problem, the source side power is found to be much lesser. The resonant frequency of the load was varied by connecting additional capacitors using electro-mechanical switches to control the output power This resulted in higher costs with a complex control. Inverter (SRI) was proposed by Burdio et al A high-frequency inverter was developed to feed power to two loads with the output power control using the AVC control technique. This work proposes the frequency bifurcation phenomena for feeding power to multiple loads with an AC-AC converter and controlling the output power with PDM control logic.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
