Electronic Circuits
Bahram Rashidi; Ali Mirzajani Nooshabadi
Abstract
Background and Objectives: This paper presents a high-performance and efficient circuit based on low-cost coils for induction heating applications. We design the coils specifically for induction sealing and induction cooker applications. The proposed circuit utilizes two parallel sets of MOSFET transistors ...
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Background and Objectives: This paper presents a high-performance and efficient circuit based on low-cost coils for induction heating applications. We design the coils specifically for induction sealing and induction cooker applications. The proposed circuit utilizes two parallel sets of MOSFET transistors to increase the current flow and output power.Methods: Three types of coils have been developed in square and rectangular designs on the printed circuit board (PCB). In this case, the construction process is simple and requires minimal time. Induction coils designed for induction sealing applications have a rectangular structure that effectively seals a wide range of bottles.Results: The flexibility of the proposed circuit is one of its advantages; the output frequency can be adjusted by increasing or decreasing the number of capacitors in the capacitor bank. Performance comparisons (e.g., efficiency, power density, cost) between the proposed method and other studies show that the implementation cost of the proposed circuit is lower than that of others. The proposed circuit achieves 95% efficiency. Thermal imaging confirms the circuit's performance. Based on the electromagnetic interference results, the circuit's performance is not affected by an external magnetic field.Conclusion: The proposed circuit has been tested with different capacitor banks using two power supplies of 24 V and 12 V. The peak-to-peak output voltage is 181 V and 92 V for the 24 V and 12 V power supplies, respectively. The results demonstrate that the circuit and coils are suitable for induction heating applications.
Electronic Circuits
M. A. Latifzadeh; P. Amiri; H. Allahyari; H. Faezi
Abstract
Background and Objectives: Many applications use boost converters as front-end circuits, including power factor correction (PFC), solar power generation, fuel cell power conversion, battery chargers, and uninterruptible power supply. In addition, boost converters have a simple structure with low component ...
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Background and Objectives: Many applications use boost converters as front-end circuits, including power factor correction (PFC), solar power generation, fuel cell power conversion, battery chargers, and uninterruptible power supply. In addition, boost converters have a simple structure with low component counts, which makes them a convenient choice.Methods: This article proposes a coupled-inductor active auxiliary circuit to create a new low-stress boost converter with soft-switching. The proposed auxiliary circuit supplies the main switch and diode with soft-switching ZVC turn-on and ZCS turn-off states. The main switch and diode are not deal with any extra stress of voltage or current. Furthermore, the soft switching condition is also provided for auxiliary circuit components.Results: The proposed auxiliary circuit also has a simple structure, low circulating current losses, low cost, and simplicity in control. The operation state and performance of the proposed soft-switching boost converter are examined, and the design procedure is presented. Finally, a 200W prototype is implemented and tested to validate the theoretical results. The offered experimental data verified the theoretical analysis.Conclusion: This paper provides a new low-stress soft-switching boost converter using a simple coupled-inductor in the auxiliary circuit. Moreover, the auxiliary part consists of two diodes, one switch, one resonance capacitor, and a coupled inductor. The suggested auxiliary circuit provides soft switching condition for the main switch, which provides ZVS in the turn-on transient and ZCS in the turn-off transient, while in this situation, the soft-switching condition is provided for the auxiliary switch, which turns on under ZCS and also turns off with practically ZVS conditions. The auxiliary circuit does not impose additional voltage or current stress on the main switch. A 200 W prototype is implemented to validate the performance of this snubber cell. The experimental data reported here support the theoretical analysis. The best point of efficiency is 95.9% which is occurred at maximum load, and is 6.3% greater than the traditional counterparts.
