Simple Lossless Inductive Snubbers-Assisted Series Load Resonant Inverter Operating under ZCS-PDM Scheme for High-Frequency Induction Heating Fixed Roller

Abstract

This paper presents a high-frequency pulse-density-modulated (PDM) soft-switching series load resonant inverter for use in induction heating (IH) fixed roller applications, which is used in copy and printing machines. The proposed simple high-frequency resonant inverter uses an asymmetrical pulse pattern PDM control scheme to achieve complete zero-current soft-switching commutations over a wide output range of input power regulation. Additionally, when the printer toner requires operation in very light load conditions, this causes difficulty in achieving zero-voltage or zero-current soft-switching operations in the IH high-frequency resonant inverters with pulse frequency modulation or pulse width modulation control schemes. The proposed resonant inverter demonstrates the capability to accomplish highly efficient power conversions. In this work, a fixed roller for printing machines is developed for doing experiments to verify the efficiency of the proposed circuit topology and its PDM control schemes. The inverter’s steady-state and transient operating principles are analyzed based on the proposed control strategy at a high-frequency PDM. Operating conditions such as power loss analysis, power conversion efficiency and temperature rise characteristics of the proposed inverter are presented and analyzed through experimental results. Finally, from a practical viewpoint, a comparative study of a conventional halogen lamp heater and the proposed IH fixed roller is deliberated.

High-Power-Factor LC Series Resonant Converter Operating Off-Resonance with Inductors Elaborated with a Composed Material of Resin/Iron Powder

“…The use of new semiconductor materials for the creation of integrated circuits and other devices has made it possible to significantly reduce the size of any type of electronic system [3,4]. Regarding losses in semiconductor devices, there are soft-switching techniques that greatly reduce this drawback, allowing them to operate at high frequencies to reduce the size of passive elements [5][6][7]. The problems of losses due to magnetic materials are the most difficult to deal with and have led designers to try different materials in the construction of cores for the magnetic components of power converters [8][9][10].…”

“…The problems of losses due to magnetic materials are the most difficult to deal with and have led designers to try different materials in the construction of cores for the magnetic components of power converters [8][9][10]. Currently, the most commonly used magnetic components for high-frequency applications use ferrite, air, and nanocrystalline magnetic cores [1][2][3][4][5][6][7][8][9][10][11][12][13]. The problem with using ferrite cores is that they have a low saturation flux density, typically between 0.2 and 0.5 T, whereas air-core inductors have drawbacks with unwanted stray inductances, causing electromagnetic interference that can affect nearby devices [14][15][16].…”