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Induction Cooking Application Based on Class E Resonant Inverter: Simulation Using MATLAB

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Induction Cooking Application Based on Class E Resonant Inverter: Simulation Using MATLAB International Journal of Science and Research (IJSR) ISSN (Online): 2319-7064 Index Copernicus Value (2013): 6.14 | Impact Factor (2013): 4.438 Induction Cooking Application Based on Class E Resonant Inverter: Simulation using MATLAB Hemlata N. Mungikar1, V. S. Jape2 1Electrical Department, PES’s Modern College of Engineering,. Pune, India 2Professor, Electrical Department, PES’s Modern College of Engineering,. Pune, India Abstract: This paper presents simulation of induction cooker circuit using class E resonant inverter in MATLAB. Induction heating is well known technique for producing very high temperature in fraction of time. Induction cooking is an application of induction heating which is used for residential and commercial usage. With the help of class E resonant inverter, high power factor and low line current can be obtained, which are very attractive in terms of commercial production. The induction cooker's parameters using class E resonant inverter are designed properly and details of design are described. Switching technique using pulse density modulation (PDM) is presented for the inverter to control the temperature. Along with the description of system model simulation results are obtained and verified with the system model. Keywords: Class E resonant inverter, Induction cooker, MATLAB Simulink, Pulse density modulation (PDM) 1. Introduction coil, a resonance capacitor is placed in parallel to the coil. Semiconductor switches operate in hard switch mode with a There are three main methods of cooking chemical, electrical very high frequency that’s why pulse density modulation and induction heating. In chemical heating it burns some (PDM) technology is used in system. combustible substance such as wood, coal, gas. Electric heating uses an electrical current through a resistance element. It has disadvantages like poor efficiency, high power loss considering it is a contact heating method. Induction heating is a very efficient technique to produce very high temperature in very less time. In induction heating Figure 1: Induction cooking block diagram AC current is flowing through the heating coil generates flux causing eddy currents to flow in the load to be heated thus The sufficient heat needed to produce useful cooking within electric energy gets converted to heat. It is mainly used for the cookware requires a very high rate of change in the applications like surface hardening, melting, brazing. In magnetic field and a high frequency of alternating current these applications appropriate frequency and skin depth are flowing through the induction coil. Induction cooktops the main factors to be taken into consideration. Due to all contains electronic devices that increase the frequency and advancements in the power electronics, induction heating protects wiring. Frequency at the coil is very large than input technique can be applied for domestic use. Induction cooking frequency. Induction cookware is basically ferrous metals system consists of an inverter for generating AC, inductor because these are relatively poor conductor of electricity so coil, insulator between coil and pan, cooking vessel. High they have high resistance. When a current is run through a frequency resonant inverters are used which consists of half material with a high resistance, much of the current is bridge or full bridge configuration depending on the converted to heat. The heat used to cook food on an requirement of the performance and control capabilities. Half induction cooktop comes from this electrical resistance and bridge topology is used due to its simplicity and compactness changes in the magnetic field of the cookware. where as full bridge is used due to its control capabilities. Initially it employs a centre tapped transformer of high The induction cooker is an application of induction heating frequency at output to provide the impedance matching which is used for commercial and residential usage. Higher function. The transformer must be cooled to remove excess speed, energy efficiency, low wastage of heat, cleanliness, heat generated in the system. Series resonant inverter uniform heating and safety are the main characteristics of an requires transformer for matching output power to the load induction cooker. Due to low switching losses of but it carries very high current so power loss occurs and semiconductor devices and low cost due to simple circuit, efficiency gets reduced. Series resonant inverter impedance induction cook tops have attracted special interest for is very small at the resonant frequency so maximum gain can consumer induction heating appliances. Fig.1 shows the be obtained at resonant frequency. So that use of class E induction cooking block diagram. AC supply is passed resonant inverter is very effective for low conduction loss, through rectifier for getting required DC voltage as inverter’s high efficiency, low total harmonic distortion. input. When current reaches to induction coil, it’s been increased to a frequency 1000 times higher than that of a The objective of this paper is to introduce MATLAB wall socket. Power losses during switching transitions and Simulink for induction cooker based on class E resonant harmonics in the circuit can be reduced by using resonant inverter. The output power can be controlled by varying network. In order to compensate the inductive nature of the switching frequency and inverter operates under zero voltage Volume 4 Issue 5, May 2015 www.ijsr.net Paper ID: SUB154592 Licensed Under Creative Commons Attribution CC BY 1874 International Journal of Science and Research (IJSR) ISSN (Online): 2319-7064 Index Copernicus Value (2013): 6.14 | Impact Factor (2013): 4.438 switching (ZVS) for triggering of devices. In ZVS power is 2. System Model switched ON or OFF when output is zero volts. ZVS ensures minimum heating of the devices making the operation very Fig.2 illustrates the circuit of the proposed zero voltage efficient and effective. The pulse density modulation method switching class E resonant inverter for induction cooking regulates the output power by varying the period in which application. It is made up of a bridge rectifier D1-D2-D3-D4, the inverter supplies high frequency current to the induction an electromagnetic filter L1–C1 and a class E resonant coil. Proposed induction cooker is designed for an operating inverter Q-L2-C2. The pulse density modulation of the gate frequency of 32 kHz, a 220 V line rms voltage, a 50 Hz line signal is controlled to regulate the temperature, in order to frequency and a 1 kW output power [1]. guarantee the zero-voltage switching (ZVS) condition[1][2]. As IGBT is switched at zero voltage, power losses are reduced The paper is organized as follows, Section I gives brief to minimum. introduction and classical approach of the project. Section II contains description about system model with mathematical As shown in Fig.2, the diodes D1, D4 operate during the modelling. Section III has overview of pulse density positive half cycle. Mode 1 is active when switch Q is ON. modulation. Experimental results with simulation model and During mode 1, the active switch Q is turned ON with ZVS, results are explained in section IV. Section V has conclusion the current flow the through L2. The collector current included with references. through Q increases till Q gets off. The diodes D2 and D3 of the bridge rectifier operate during the negative half cycle. Mode 2 is active when Q is turned OFF. Figure 2: Proposed Induction cooker with Class E Resonant Inverter The active switch can be operated under the ZVS condition 3. Pulse Density Modulation due to which conduction losses and harmonic currents can be reduced. Power is switched ON or OFF when output is Control strategies like frequency control and phase shift zero volt which increases life of cooking appliance. High control have disadvantages like switching losses, noise as not efficiency, high power factor and low line current harmonic all the semiconductor devices work on ZVS. These distortion ensures higher efficiency for induction cooker [3]. drawbacks are overcome by another strategy which is pulse density modulation. PDM has fix firing pattern at zero Referring to the equivalent circuit of induction cooker with voltage. Power regulation is done by adjusting the number of class E resonant inverter [4] is shown in Fig.2. For the pulses during ON time. In PDM switching frequency is equal operating frequency of 32 kHz, a 220 V line rms voltage, 50 to the resonant frequency. ON and OFF pattern is obtained Hz line frequency and 1 kW output power[1]. Now, by keeping switching frequency constant. It is relative Equivalent resistance – R, Resonant inductor – L, Resonant density of the pulses that corresponds to the amplitude of the capacitor – C2 Line voltage – V, Output power – Po, signal. Generally pulse width modulation (PWM) is used to Switching frequency – f1 Resonant frequency – f2 , generate an analog output signal using digital Switching angular frequency – w 1.552 V×V microcontroller. It is implemented in hardware itself but if R = (1) Po not then PDM technique is used. It produces comparable 0.065 R results to PWM but with lower interrupt layer. It conveys L2 = (2) f2 0.162 signal by modulating density of the pulses. C2 = (3) f2× R Volume 4 Issue 5, May 2015 www.ijsr.net Paper ID: SUB154592 Licensed Under Creative Commons Attribution CC BY 1875 International Journal of Science and Research (IJSR) ISSN (Online): 2319-7064 Index Copernicus Value (2013): 6.14 | Impact Factor (2013): 4.438 mathematically calculated from (1) (2) (3). The high frequency inverter feeds the load by the required power at 32 KHz from the 50 Hz supply through a diode rectifier. Voltage, current and power measurements are taken at input and output. Figure 3: PDM technique PDM technique can be explained as in Fig.3. For the induction cooking purpose, PDM technique is used for temperature control purpose. As appropriate temperature for Figure 4: Modelling of proposed induction cooker in heating food items is very essential, PDM technique adjusts MATLAB Simulink temperature by controlling duty cycle.
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