• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.18 no.5
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• pp.27-34
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• 2004

In this paper, we designed the electronic ballast for the 400[W] hight pressure sodium lamp using the half-bridge inverter Inductance and capacitance in the proposed equivalent LC series resonant circuit are calculated theoretically. We performed the simulation of the LC series half-bridge inverter circuit using the IsSPICE and the electronic ballast for the high pressure sodium lamp were implemented for verifing the simulation results. In the experimental results, the specification of the implemented electronic ballast are almost same with the simulated one. The experimental results show the good performance as PF 99.3[%], $A_{THD}$ 10.01[%], lamp efficiency 119[lm/W] at the output 400[W].].

• Proceedings of the KIPE Conference
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• 2008.06a
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• pp.157-159
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• 2008

Generally, Capacitor charging power supply (CCPS) consist of the full-bridge inverter, LC resonant tank and capacitance load. The multi-connection systems are normally used for high voltage or high power application. In this paper, conventional parallel operation resonant type and proposed series operation PWM type CCPS for pulse corona occurrence of DeSOx, DeNOx system using magnetic pulse compressor make a comparison. The effect of proposed CCPS is verified by circuit characteristics analysis of parallel operation resonant type and series operation PWM type, and it is confirmed by simulation result.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.41 no.2
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• pp.125-134
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• 1992

This paper presents a cycloconverter with an LC resonant circuit for an induction motor drive. The cycloconverter can keep input displacement factor at 1.0 by independently controlling real and reactive power under any load conditions. Furthermore it can keep power factor at about 1.0 since input and output current waveforms are nearly sinusoidal. Since it uses high frequency resonant circuit for commutation source, it can produce an output voltage of hundreds of hertz. Since it is also possible to make a system of high capacity using the cycloconverter, it is appropriate to drive motors with high speed and high capacity as well as general purpose motors, In this paper, we describe the operating principles of the cycloconverter and power control algorithms, and analyze its waveforms and present its characteristics. Expermental results are shown for the volts/hertz control of the induction motor and the validity of the proposed model is verified.

• Proceedings of the KIEE Conference
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• 1997.11a
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• pp.422-425
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• 1997

This paper describes a resonant fly-back converter for high-voltage de distribution system. The proposed converter operates to change high-voltage de into low-voltage de with isolation and large converting ratio. The converter has a thyristor switch with an LC resonant circuit for commutation in the primary side of the gap transformer. The operation of the proposed system was verified through computer simulations and hardware scaled-model tests. The proposed system can be implemented with commercially available components and proven technologies.

• Proceedings of the KIEE Conference
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• 1995.07a
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• pp.209-211
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• 1995

This paper is concerned with High Frequency, High Voltage Generator for X-ray using zero-voltage soft-switching PWM DC-DC high-power converter by Resonant method, which makes the most of the parastic LC parameters of high-voltage transformer link, for diagnostic X-ray power generator. The converter circuit basically utilizes phase-shift pulse width modulated series Resonant full-bridge PWM DC-DC high-power converter operating at a constant frequency;25kHz. The converter output regulation is digitally controlled using DSP (Digital Signal Processor) for obtaining a fast rising time and adjust output voltage within a wide load range.

• Proceedings of the KIPE Conference
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• 2009.11a
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• pp.182-184
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• 2009

본 논문은 램프 점등을 위한 공진회로와 정상상태에서의 저주파수 구형파(low frequency square-wave) 인버터 전류 제어를 실현하는 HID 전자식 안정기에 풀브리지 인버터(FB)와 LC 필터를 제안한다. 점등은 LC필터의 공진주파수에서 풀브리지 인버터 제어에 의한 공진에 의해서 이루어지고, 점등 후에 회로는 풀브리지 제어에 의해 벅컨버터 저주파수 구형파 인버터로 동작한다. 점등이 일어나는 동안의 LC필터의 공진주파수는 ($f_o$=120kHz)이고, 고조파를 감소시키고 음향공명현상을 피하기 위한 벅컨버터스위칭 주파수($f_{sw}$=50kHz)를 선택하였다.

• Proceedings of the KIEE Conference
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• 1992.07b
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• pp.1154-1157
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• 1992

This paper presents a study on the current control method of the cycloconverters with high frequency LC resonant tank circuits for induction heating. The current control algorithms of the cycloconverters are proposed. Since the current waveforms of the cycloconverters have ripple, we proposed the compansation methods for that effects. And the performance of the current control system is considered with the results of the simulation by using the proposed current control algorithms.

• Proceedings of the KIPE Conference
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• 2012.11a
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• pp.25-26
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• 2012

Wireless power transmission introduced by Tesla has instrumented by many scientists of the world. This technique first was utilized as wireless communications such as radio in long range transmission. And contactless transmission using inductive property was used on white goods. In 2007, MIT' lab introduced that new wireless power transmission by magnetic resonance which has about 50% efficiency and 2M transmission distances, it was a chance to refocus a new possibility of wireless power transmission. In this paper, using LC coupling compensate the short distances of contactless transmission, this simple method could transmit about 30cm distances. Using this approach, it can be solved the short transmission distances, a drawback of Electromagnetic inductive coupling method.

• Proceedings of the KIEE Conference
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• 2000.07c
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• pp.2254-2256
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• 2000

This paper presents an implantable telemetry LC resonance-type pressure sensor for the measurement of the ventricle pressure. This sensor consists of a capacitor and an inductor. This resonant circuit is magnetically coupled with an external antenna coil. The resonance frequency of the circuit decreases as the sensor capacitance is increased by the applied pressure. The inductance and the capacitance are 428nH and 0.98${\mu}F$, respectively. The resonance frequency is 245.7MHz when the differential pressure is zero. The sensitivity of the sensor is 9.477kHz/Pa.

• Proceedings of the KIPE Conference
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• 2015.07a
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• pp.181-182
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• 2015

본 논문에서는 태양전지, 연료전지 등 저전압 에너지원 응용에 적합한 고승압 컨버터를 제안한다. 제안하는 토폴로지는 부스트 컨버터를 기반으로 LC 병렬 공진 탱크를 이용함으로써 높은 승압비를 얻을 수 있다. 추가된 스위치와 다이오드는 각각 영전압 스위칭 턴 온과 영전류 스위칭 턴 오프의 특성을 갖는다. 250W(380V, 0.658A)의 시작품을 제작하여 제안하는 회로의 타당성을 검증하였다