Phase Locked Loop based Pulse Density Modulation Scheme for the Power Control of Induction Heating Applications

Booma Nagarajan; Rama Reddy Sathi

Phase Locked Loop based Pulse Density Modulation Scheme for the Power Control of Induction Heating Applications

Booma Nagarajan

Rama Reddy Sathi

Vol. 15, No. 1, pp. 65-77, Jan. 2015

10.6113/JPE.2015.15.1.65

Class-D inverter

Induction heating

Phase locked loop

Pulse density modulation

Zero voltage switching

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Abstract

Resonant converters are well suited for induction heating (IH) applications due to their advantages such as efficiency and powerdensity. The control systems of these appliances should provide smooth and wide power control with fewer losses. In this paper, asimple phase locked loop (PLL) based variable duty cycle (VDC) pulse density modulation (PDM) power control scheme for use inclass-D inverters for IH loads is proposed. This VDC PDM control method provides a wide power control range. This controlscheme also achieves stable and efficient Zero-Voltage-Switching (ZVS) operation over a wide load range. Analysis and modelingof an IH load is done to perform a time domain simulation. The design and output power analysis of a class-D inverter are done forboth the conventional pulse width modulation (PWM) and the proposed PLL based VDC PDM methods. The control principles ofthe proposed method are described in detail. The validity of the proposed control scheme is verified through MATLAB simulations. The PLL loop maintains operation closer to the resonant frequency irrespective of variations in the load parameters. The proposedcontrol scheme provides a linear output power variation to simplify the control logic. A prototype of the class-D inverter system isimplemented to validate the simulation results.

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Cite this article

[IEEE Style]

B. Nagarajan and R. R. Sathi, "Phase Locked Loop based Pulse Density Modulation Scheme for the Power Control of Induction Heating Applications," Journal of Power Electronics, vol. 15, no. 1, pp. 65-77, 2015. DOI: 10.6113/JPE.2015.15.1.65.

[ACM Style]

Booma Nagarajan and Rama Reddy Sathi. 2015. Phase Locked Loop based Pulse Density Modulation Scheme for the Power Control of Induction Heating Applications. Journal of Power Electronics, 15, 1, (2015), 65-77. DOI: 10.6113/JPE.2015.15.1.65.