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This paper presents a high efficiency LCCL series resonant inverter for ultrasonic dispersion system with resonant frequency tracking and asymmetrical voltage cancellation control. With the proposed control, the operating frequency of the inverter is automatically adjusted to track the resonant frequency under load parameter variation due to surrounding condition. The zero-voltage switching (ZVS)...
This paper presents a three-phase output power control scheme of an induction heating (IH) system using an automatic variable-frequency symmetrical voltage-cancellation (AVFSVC) control technique. The power control is based on the instantaneous output power, filtered and compared with a reference value. The phase angle a is automatically varied depending on the power requirements where the low-power...
This paper presents a three-phase constant output power control scheme of an induction heating system using an automatic variable-frequency symmetrical voltage-cancellation (AVFSVC) control technique. The control scheme is based on a product of current and voltage in the induction coil. The resulting instantaneous output power is filtered and compared with a reference value. The output power can be...
This paper presents a combined pulse density modulation (PDM) and asymmetrical voltage cancellation (AVC) control for induction cooking appliances. The average output power can be adjusted by the varying output voltage waveform, which achieves the zero-voltage switching (ZVS) condition, and reduced the power losses on the IGBT switches. The proposed control improves the efficiency at the low power...
This paper presents a digital implementation of power control for induction cooking appliances with domestic low-cost vessels. The proposed control strategy is based on the asymmetrical duty-cycle with automatic switching-frequency tracking control employing a digital phase locked-loop (DPLL) control on high performance microcontroller. With the use of a phase locked-loop control, this method ensures...
This paper describes quasi-resonant converter for induction heating in high temperature application. Converter is implemented by using IGBT as its switching. The switching loss is minimized by operating the IGBT in the zero voltage resonance modes. The output power can be adjust by varying the switching frequency of converter. The prototype is tested under load-parameter variation during the heating...
This paper presents a dsPIC-based constant power controller for induction heating applications. The controller keeps the operation in the inductive mode by providing the minimum phase difference between the output voltage and current. The current limiting protection is also applied. The experiment is set up with a steel crucible of 83 mm in diameter and 100 mm in height with aluminum inside. The output...
This paper presents an improved dual output full-bridge series resonant inverter with asymmetrical voltage-cancellation (AVC) control for cooking appliance. The important advantage of the proposed control is that the output power can be adjustable independently while achieving the zero-voltage switching (ZVS) operation. The power loss analysis on the insulated gate bipolar transistor (IGBT) and an...
This paper presents a dual output full-bridge series resonant inverter with improved asymmetrical voltage-cancellation control for induction cooking appliance. The proposed control scheme can adjust the output power separately, and achieves the zero-voltage switching (ZVS) condition with improved efficiency. A laboratory prototype has been implemented on a DSPIC2010 controller. The experimental results...
The variable-frequency asymmetrical voltage-cancellation (VFAVC) control is proposed in this paper to control the output power for a series resonant load with a full-bridge inverter for home appliance as induction cooking. The asymmetrical voltage-cancellation is used for controlling the output power. With the low quality factor loads, a fixed-frequency control might lead to non-zero-voltage-switching...
A class D current source resonant inverter (CSRI) with interleaved buck converter for induction heating power supplies for non-ferromagnetic load is proposed in this paper. The switching devices of CSRI are connected through the common ground and only a single dc power supply is needed for the gate driver circuitry. The maximum output power transferred to the load for the hardware prototype is 1.26...
This paper presents a power control strategy of the full-bridge series resonant inverter based on the asymmetrical voltage-cancellation control with variable-frequency in induction cooking appliances with a load of low Q factor on the domestic markets. The switching frequency of inverter is suitably operated higher than the resonant frequency under zero-voltage-switching (ZVS) condition. The proposed...
This paper presents a design of a 1.5kW half-bridge resonant inverter system for induction heating applications. The inverter operates at a switching frequency range of 20-40 kHz where the zero voltage condition operation is maintained. The rectifier circuit employs a pulse-width modulation (PWM) operating at the switching frequency of 10 kHz. With the proposed system, the output power can be controlled...
A half-bridge resonant inverter with three-phase PWM rectifier for induction heating is proposed in this paper. An adjustable frequency limit is introduced to maintain the inverter's switching frequency at a value higher than the resonant frequency for zero voltage operation. In case of no work piece in the induction coil, the dc bus can be adjusted while the switching frequency of the inverter remains...
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