Investigation on Performance of Various Power Control Strategies with Bifilar Coil for Induction Surface Melting Application

Abstract

In recent years, induction heating applications assisted by electronic power control have been very appealing. For melting applications, induction heating is widely used as it seems to be appropriate and provides higher efficiency, zero pollutants, non-contamination of material, etc. in comparison with conventional heating. The conventional variable frequency control scheme is not sufficient for melting applications because of its high switching loss, low efficiency, and lower heat rate. A superlative control technique is required to control the output power smoothly, for a high heating rate with minimum power loss, and to lower the number of components. In this paper, a capacitorless self-resonating bifilar coil is proposed for induction surface melting applications. The performance of the system in terms of modular losses, heat rate, and efficiency is analyzed for various power methods such as pulse duty cycle control, phase shift control, pulse density modulation control, and asymmetric duty cycle control. An experimental validation is performed for the 1 kW prototype, and the heating rate, efficiency, and modular losses are calculated. The control technique is digitally validated using a PIC16F877A microcontroller with 30 kHz switching frequency. The temperature distribution is analyzed using a FLIR thermal imager. Among the tested methods, pulse density modulation-based control provides smooth and varied power control from 0% to 100% with minimum modular losses. The efficiency of the system is 89% at a rated output power and is greater than 85% for pulse density modulation control with a fast heating rate.

Study on the Uniformity of Temperature Distribution of Transverse Flux Induction Heating Based on a New Magnetic Pole

“…Then, the strip is moved forward by 20 mm. Column 1 and column 2 of the strip are at the Q[i] [2], Q[i] [1] (i = 1, 2, . .…”

“…Compared with the traditional open-fire heating method, the induction heating method has the advantages of high heating efficiency, energy saving and environmental protection, and it has become the preferred heating method in the heat treatment industry [1,2]. Based on Faraday's electromagnetic induction law, the eddy current and moreover the eddy current loss can result on the workpiece when the alternating current is applied to its nearby winding, and thus the target workpiece will be heated, which can be called induction heating [3].…”

Energy Consumption in a Smart City

“…In the eighth paper, Sureshkumar et al [8] focus on induction heating for melting applications assisted by electronic power control as appealing technology since it provides higher efficiency, zero pollutants, non-contamination of material, etc. in comparison with conventional heating.…”

Review on single‐phase high‐frequency resonant inverters for current sharing in multiple inverter system

“…Compared to conventional heating technology, IH does not cause pollution, so it is widely used in industry, and it is also favored by domestic cooking. [23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38][39] In microgrid systems, SPHFRI has potential for application because the use of high-frequency voltages makes harmonic filtering easier. 40,41 High-frequency transformers and other passive components are also smaller, which will significantly reduce the system cost of microgrids.…”

“…In IH systems, SPHFRI serves as a key component to convert electrical energy into safe and controllable thermal energy in a contactless and efficient manner. Compared to conventional heating technology, IH does not cause pollution, so it is widely used in industry, and it is also favored by domestic cooking 23–39 . In microgrid systems, SPHFRI has potential for application because the use of high‐frequency voltages makes harmonic filtering easier 40,41 .…”