Fuzzy Logic-Based Pulse Density Modulation Scheme for Mitigating Uncertainties in AC–AC Resonant Converter Aided Induction Heating System

2018 ◽  
Vol 28 (02) ◽  
pp. 1950030 ◽  
Author(s):  
Pradeep Vishnuram ◽  
Sridhar Ramasamy
Keyword(s):  
Fuzzy Logic ◽  
Induction Heating ◽  
Single Stage ◽  
Control Technique ◽  
Modulation Scheme ◽  
Resonant Converter ◽  
Switching Loss ◽  
Pulse Density ◽  
Density Modulation ◽  
Pulse Density Modulation

Induction heating (IH) applications aided by power electronic control system have become very attractive in the recent past. The power electronics circuits succumb to severe switching loss, lower power density if proper switching methodology is not adhered. A state of uncertainty is indispensable in IH application as the power required by the load varies depending upon the nature of work piece. This uncertain issue makes the selection of the control algorithm and controller very vital. The mundane controllers may not be compatible to combat the uncertainties and leads to exhibit dynamic problems say transients, peak overshoot and poor response. Henceforth, the IH system requires a superlative converter topology and control scheme in order to have reduced switching loss and to improve the system performance there by negating the uncertainties. Here, in this work, a direct AC–AC boost resonant converter fed by pulse density modulation (PDM) is realized in a single stage mode. A fuzzy logic-based PDM control technique improves the efficiency and provides the versatile power control with reduced time domain specifications for dynamic changes in load. The proposed system has been studied using MATLAB/SIMULINK and validated using a hardware prototype employing dsPIC30F4011 microcontroller. The results reveal that efficient control over power can be accomplished by varying the density of the switching pulses, and thereby the efficiency is enhanced even with reduced component count. Also, the single-stage conversion is effective than its two-stage counterpart.

scholarly journals Pulse Density Modulation Based Series Resonant Inverter Fed Induction Heater System

2018 ◽  
Vol 9 (2) ◽  
pp. 690
Author(s):  
S. Jaanaa Rubavathy ◽  
P. Murugesan
Keyword(s):  
Induction Heating ◽  
Output Voltage ◽  
Control Strategies ◽  
Resonant Inverter ◽  
Pulse Density ◽  
Series Resonant ◽  
Density Modulation ◽  
Simulation Results ◽  
Pulse Density Modulation ◽  
Series Resonant Inverter

This paper deals with implementation of a multi-output Series Resonant Inverter(SRI) for induction heating applications, which uses pulse density modulation(PDM) control for full bridge Series resonant inverters for output voltage and power control. It ensures better efficiency performances than conventional control strategies. The proposed converter can be considered as a two output extension of a full bridge inverter. This full bridge inverter can control the two outputs, simultaneously and independently, up to their rated powers, which reduces the usage of number of components as compared with conventional method. It also ensures higher utilization of switches used for its operation. A two output full bridge series resonant inverter is simulated and implemented. The Experimental results are compared with the simulation results.

scholarly journals Single Source Multi-Frequency AC-AC Converter for Induction Cooking Applications

Energies ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4799
Author(s):  
Pradeep Vishnuram ◽  
Suchitra Dayalan ◽  
Sudhakar Babu Thanikanti ◽  
Karthik Balasubramanian ◽  
Benedetto Nastasi
Keyword(s):  
Power Control ◽  
Real Time ◽  
Control Technique ◽  
Switching Frequency ◽  
Single Source ◽  
Multiple Loads ◽  
Switching Losses ◽  
Pulse Density ◽  
Density Modulation ◽  
Pulse Density Modulation

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.

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