Frequency control of a current-fed inverter for induction heating

Khan, Imran; Tapson, Jonathan; Vries, I. De

doi:10.1109/isie.2000.930537

Cited by 10 publications

(8 citation statements)

References 4 publications

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“…The signal generated from the latter is filtered by RC low pass filter to get an average value of voltage. The average voltage conforms to different of phase between voltage and current at load [14]. The DC voltage input to the oscillator, which is proportional to the phase difference between the inverter output voltage and inductor current, is compared with a value corresponding to 90° degrees and the switching frequency is adjusted so that this difference is made zero, when parameters of load are varied.…”

Section: Power Resonant Invertermentioning

confidence: 99%

Efficient digital adaptive control for full-bridge series resonant inverter for surface metal heating

Meziane

Zeroug

2014

7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014)

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Induction heating is a well-known technique to produce very high temperature at reduced time for well specific applications such as in melting steel, brazing, and hardening. Series resonant converter proves to suit better to surface metals treatment and hardening. Efficiency reaches its highest level in the resonant mode, where switching losses are minimized by operating the IGBT at a resonant frequency for switching at the zero crossing point of current or voltage. However, as heat rises during hardening metal process, the metal exhibits parameter variations, which ultimately affects the overall system performances. Therefore, the inverter system with an effective load-adaptive control circuit with short response time is highly sought to let the system operate efficiently regardless of any variation of the load parameters. This will bring back the system under resonant mode to allow the system to operate at its optimal performances.In this paper, an analysis of a series resonant inverter performance is conducted, in which the control frequency is monitored and continuously adapted using phase-locked loop aimed to metal hardening. The control technique is characterized by its flexibility, low cost hardware, and short response time. The system comprises analogue and digital circuits, microcontroller based. The experimental bench is built for the purpose in the range of 1 to 5 kW power, with 01 to 50 kHz operating frequency. First, the process principle and the design procedure of the inverter system with the proposed control scheme are described through modelling and simulation. Then, experimental results are presented to show the validity of this technique, and to evaluate the system performances.

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Section: Power Resonant Invertermentioning

confidence: 99%

Efficient digital adaptive control for full-bridge series resonant inverter for surface metal heating

Meziane

Zeroug

2014

7th IET International Conference on Power Electronics, Machines and Drives (PEMD 2014)

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“…The system can be controlled using a self-adaptive loop and must have an operating frequency slightly greater than the resonant frequency of the tank circuit, which comprises an induction-coil-heated piece in series with a resonant capacitor. The high-frequency induction heating inductor current can be controlled by adjusting either the output current or output voltage of the inverter, and the high-frequency control loop is sufficient to control these two output parameters [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

A closed-loop power controller model of series-resonant-inverter-fitted induction heating system

Pal¹,

Roy²,

Datta³

et al. 2016

Archives of Electrical Engineering

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This paper presents a mathematical model of a power controller for a high-frequency induction heating system based on a modified half-bridge series resonant inverter. The output real power is precise over the heating coil, and this real power is processed as a feedback signal that contends a closed-loop topology with a proportional-integral-derivative controller. This technique enables both control of the closed-loop power and determination of the stability of the high-frequency inverter. Unlike the topologies of existing power controllers, the proposed topology enables direct control of the real power of the high-frequency inverter.

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“…Among them current source topology has short circuit protection capability, and power switches can be driven with a simple gate drive circuit. Current source parallel resonant topology is used in many applications such as induction heaters [1]- [5], inverters [6]- [10], dc-dc converters [11]- [13], electronic ballasts [14], battery chargers [15] etc.…”

Section: Introductionmentioning

confidence: 99%

Simulink Model of Parallel Resonant Inverter with DSP Based PLL Controller

Öncü

Özbay

2015

ElAEE

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Resonant converters can operate at high switching frequencies with low switching losses. However, in order to reduce switching losses resonant frequency has an important role in the design. In this study, a DSP based closed loop phase locked loop (PLL) control algorithm for parallel resonant inverter is designed and simulated with MATLAB/Simulink. The validity of the Simulink model of current source inverter is tested for different loads and gain values obtained from Jury's stability. The developed DSP controlled parallel resonant inverter tracks the resonant frequency and achieves soft switching.

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Frequency control of a current-fed inverter for induction heating

Cited by 10 publications

References 4 publications

Efficient digital adaptive control for full-bridge series resonant inverter for surface metal heating

Efficient digital adaptive control for full-bridge series resonant inverter for surface metal heating

A closed-loop power controller model of series-resonant-inverter-fitted induction heating system

Simulink Model of Parallel Resonant Inverter with DSP Based PLL Controller

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