• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2008.05a
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• pp.325-328
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• 2008

This paper presents a new conceptual electromagnetic induction eddy current-based stainless steel plate spiral type heater for heat exchanger or dual packs Heater in hot water system boiler steamer and super heated steamer, which is more suitable and acceptable for new generation consumer power applications. In addition, an active clamped quasi resonant PWM high frequency inverter using trench gate IGBTs power module can operate under a principle of zero voltage soft commutation with PWM is developed and demonstrated fora high efficient induction heated hot water system and boiler in the consumer power applications This consumer induction heater power appliance using active clamp soft switching PWM high-frequency inverter is evaluated and discussed on the basis of the simulation and experimental results.

• Proceedings of the KIPE Conference
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• 2006.06a
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• pp.128-130
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• 2006

We introduce 2[MVA] 3300[V] 7-level voltage source inverter system developed by POSCON and describe the main characteristics of inverter system i.e. PWM converter, H-bridge power module, phase shifted carrier PWM The PWM converter is a three-phase boost converter, which operates in a 4-quadrant and in a nearly unit displacement power factor. Experimental waveforms are also presented to verify the proposed method and performance of the developed system.

• The Transactions of the Korean Institute of Power Electronics
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• v.3 no.4
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• pp.382-387
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• 1998

The adaptive hysteresis band current control method using neural network is proposed to hold the switching frequency of PWM inverter constant at any operating points of ac motor. The adaptive hysteresis band equation is derived as the teaching signal of neural network. and then the structure and learning algorithm of the neural network a are suggested. The simulation results show that the switching frequency of PWM inverter is held constant at any operating conditions of ac motor and the proposed method has good transient performance of stator current.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.37 no.12
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• pp.862-871
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• 1988

In this paper, a vector control system of current controlled PWM inverter-induction motor drive is proposed for quick response control. As the instantaneous value of the stator current must be controlled to accomplish the superior vector control characteristic, the current controlled PWM inverter with hysteresis controller is adopted. Complex vector rotation and calculation are handled with microprocessor software. The superior characterictic of the proposed system is verified with digital simulation and experiment.

• Proceedings of the KIEE Conference
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• 1998.07f
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• pp.1947-1950
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• 1998

GTO inverter used for traction motor drives includes harmonics in the output current and torque by the limitation of switching frequency. However, the hybrid PWM method, using SPWM in low frequency range and SHE PWM in upper frequency range, can be obtained the relative less harmonic characteristic. The transient reaction, which the magnetic flux and the torque is altered and instantly the large current is flowed, may be produced at the mode change. This paper presents the techniques which can reduce the transient reactions produced in the gear changing of inverter fed traction motor drives operating in the hybrid PWM. The results are verified by the simulations.

• Proceedings of the KIPE Conference
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• 2005.07a
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• pp.248-250
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• 2005

This paper suggests a new type of 4-switch inverter for switched reluctance motor drives. 4-switch Inverter topology is studied to provide possibility for the realization of cost of 3-phase SRM drive system. We used Y-connection and two-phase exciting method. For effective utilization of the developed system, a direct current controlled PWM scheme is designed and implemented to produce the desired dynamic. We solve to balance the neutral point of Y-connection by the direct current controlled PWM and examine the performance of proposed system. With the algorithm and developed control scheme, is expected that the proposed system can be widely used in commercial applications with a reduced system cost.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.37 no.2
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• pp.80-88
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• 1988

As a method to improve harmonics in the voltage source PWM inverter, 5 level stair case wave method is used. The complementary transistor inverter (CTI) bridge circuit has this characteristics. This circuit required synchronous type 3 level PWM signal. In this paper, the 3 phase PWM digital signals within about 10 modulation error of the natural sampling was caculated, and a ROM table out of it for the digital signal of the control system was made. According to this table, the digital control method was proposed, and DTI circuit operated by this method was reviewed. It was confirmed to make V/F control possible by the select modulation ratio to the frequency.

• The Proceedings of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.6 no.1
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• pp.40-48
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• 1992

In this paper, th technique of particular harmonics elimination in three-phase PWM Inverter is discussed. And voltage control technique is derived whereby harmonics elimination is possible in variable voltage variable frequency three-phase I.M.. The required switching patterns are determined on Personal Computer and the results are stored in look-up table in EPROM for controlling the switching of the PWM Inverter. The results show that experiments are in good agreement with simulation based on the theory.

• The Transactions of the Korean Institute of Power Electronics
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• v.4 no.6
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• pp.579-588
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• 1999

This paper presents a technique for predicting the conductLu EMI(Electro Magnetic Interference) produced b by PWM inverter-induction motor drive system. To obtain the simulation models for prediction of conduct떠 n noise, high frequency model of an inverter leg with parasitic elements and multi-coil model of stator winding M are designed. Finally, the results are confirmLu from simulation and experiments.

• Proceedings of the KIEE Conference
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• 1995.07a
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• pp.300-302
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• 1995

This paper describes a current control method for a single-phase PWM inverter. The proposed PWM inverter utilizes the instantaneous control method which is based on the real-time digital feedback control and the microprocessor-based deadbeat control. For the deadbeat current controller, the system's order becomes a high order and increases computation delay time. Therefore, The delay time produces current ripple. To minimize the current ripple, a new method based on deadbeat control theory for current regulation is proposed. It is constructed by a reduced-order state observer which predicts the output current in next sampling instant.