• Title/Summary/Keyword: Pulse Transformer

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Series Resonant ZCS- PFM DC-DC Converter using High Frequency Transformer Parasitic Inductive Components and Lossless Inductive Snubber for High Power Microwave Generator

  • Kwon, Soon-Kurl;Saha, Bishwajit;Mun, Sang-Pil;Nishimura, Kazunori;Nakaoka, Mutsuo
    • Journal of Power Electronics
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    • v.9 no.1
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    • pp.18-25
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    • 2009
  • Conventional series-resonant pulse frequency modulation controlled DC-DC high power converters with a high-frequency transformer link which is designed for driving the high power microwave generator has the problem of hard switching commutation at turn-on and turn-off of active power switching devices. This problem is due to the influence of the magnetizing current of the high-frequency transformer. This paper presents a novel prototype for a high-frequency transformer using parasitic parameters with a lossless inductive snubber and a series resonant capacitor assisted series-resonant zero current switching pulse frequency modulated DC-DC power converter, which is designed using a high power magnetron for microwave ovens. In order to implement a complete and efficient soft switching commutation, the performance of the new converter topology is practically confirmed and evaluated in the prototype of a power microwave generator.

Study for the Design and Measurement of the High Voltage Pulse Generator Using Transformers (트랜스포머를 이용한 고전압 펄스 발생 장치의 설계와 측정평가에 관한 연구)

  • Kim, Young-Ju
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.1
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    • pp.82-86
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    • 2012
  • High-capacity high-voltage pulse generator that can be used for environmental clean-up was developed using transformers. High-voltage pulse is consists of the primary wave and the harmonic wave which are increased as a series circuit using transformers to make pulses. Each transformer has a band-pass characteristics. The output voltage of the pulse width 50[%] was decided. The output voltage of high-voltage pulse generator device was measured as 1.4[kV] (Peak-to-Peak).

A Study on Optimization of Compact High-voltage Generator Based on Magnetic-core Tesla Transformer

  • Jeong, Young-Kyung;Youn, Dong-Gi;Lee, Moon-Qee
    • Journal of Electrical Engineering and Technology
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    • v.9 no.4
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    • pp.1349-1354
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    • 2014
  • This paper presents a compact and portable high-voltage generator based on magnetic-core Tesla transformer for driving an UWB high power electromagnetic source. In order to optimize the performance of the high-voltage generator, a novel open-loop cylindrical magnetic-core adopting the quad-division lamination structure is proposed and manufactured. The designed high-voltage generator using the proposed magnetic core has a battery-powered operation and compact size of $280mm{\times}150mm$ in length and diameter, respectively. The high-voltage generator can produce a voltage pulse waveform with peak amplitude of 450 kV, a rise time of 1.5 ns, and pulse duration of 2.5 ns at the 800 V input voltage.

Harmonic Reduction of Three Phase Multi-Pulse Converter Circuit without Input Transformer (입력 변압기 없는 3상 멀티-펄스 콘버터의 고조파 저감)

  • Park, Hyun-Chul;Kim, Yeong-Min;Hwang, Jong-Sun;Kim, Jong-Man
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2002.05b
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    • pp.128-131
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    • 2002
  • In this paper, a new method for reducing harmonic in input AC line currents of converter presents, which is the multi-pulse converter circuit without the input transformer. This system can reduce the harmonic like conventional 12-pulse converter. Both the bridge circuits are controlled with the shifted firing angle and connected 2 tap inter-phase reactor. Using 2 tap changing on inter-phase reactor, the input current is controlled with the different two values in order to make the input current waveform 12 pulses.

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Bi-polar High-voltage Pulse Generator Using Semiconductor switches (반도체 스위치를 이용한 양방향 고압 펄스 발생기)

  • Kim J.H.;Ryu M.Y.;Jung I.W.;Shenderey S.;Kim J.S.;Rim G.H.
    • Proceedings of the KIPE Conference
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    • 2003.07a
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    • pp.291-293
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    • 2003
  • A semiconductor switch-based fast hi-polar high voltage pulse generator is proposed in this paper The proposed pulse system is made of a thyristor based-rectifier, DC link capacitor, a push-pull resonant inverter, a high voltage transformer. secondary capacitor, a high voltage IGBT & diode stacks, and a variable capacitor. The proposed system makes hi-polar high voltage sinusoidal waveform using resonance between leakage inductance of the transformer and secondary capacitor and transfers energy to output load at maximum of the secondary capacitor voltage. Compared to previous hi-polar high voltage pulse power supply using nonlinear transmission line, the proposed pulse power system using only semiconductor switches has simple structure and gives high efficiency

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A Zigzag Connected Auto-Transformer Based 24-Pulse AC-DC Converter

  • Singh, Bhim;Gairola, Sanjay
    • Journal of Electrical Engineering and Technology
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    • v.3 no.2
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    • pp.235-242
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    • 2008
  • In this paper, a 24-pulse AC-DC converter is designed, modeled, simulated, and developed to feed non-isolated varying loads. The proposed AC-DC converter configuration consists of an auto-transformer based on zigzag connection to overcome current harmonic problems in AC mains. It improves power quality at AC mains and it meets IEEE-519 standard requirements at varying loads. A set of power quality indices on input AC mains and on DC buses for a load fed from 6-pulse and 12-pulse AC-DC converters is also given to compare their performance. It is observed that input current total harmonic distortion(THD) of less than 8% is possible with the proposed topology of AC-DC converter at varying loads.

A study on the pulse forming of pulsed $CO_2$ laser using active multi-pulse superposition (능동적 다중 펄스 중첩법(AMPS)을 적용한 펄스형 $CO_2$ 레이저의 펄스 성형에 대한 연구)

  • Chung, Hyun-Ju;Park, Sung-Joon;Jung, Yong-Ho;Song, Gun-Ju;Kim, Hee-Je;Kim, Whi-Young
    • Proceedings of the KIEE Conference
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    • 2001.07c
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    • pp.1631-1633
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    • 2001
  • In manufacturing processes, various and suitable pulse shapes are required for the purpose of material processing and the pulseshape is regarded as a dominant factor due to the specific property of processing materials. Therefore, in this study, a variable pulse width, high duty cycle Pulse Forming Network(PFN) is constructed by time sequently. The power supply for this experiment consists of three switching circuits. The PFN elements operate at low voltage and drive the primary of HV leakage transformer. The secondary of the transformer has a full-wave rectifier, which passes the pulse energy to the load in a continuous sequence of properly phased and nested increments. We investigated laser pulse width as various delay time among three switching circuit. As a result, we tan obtain various laser pulse width from about 4ms to 10ms. The maximum laser pulse width obtained at this experiment was about 10ms at delay time of 4ms among each switching circuit.

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Analysis of Harmonic Effects on Substation Power System and its Countermeasure (지하철 전력계통의 고조파 영향 분석 및 그 대책에 관한 연구)

  • Song, Jin-Ho;Hwang, Yu-Mo
    • The Transactions of the Korean Institute of Electrical Engineers B
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    • v.51 no.4
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    • pp.210-220
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    • 2002
  • We analysised the effect of harmonics on electric machines of substation power system barred on quantitatively measured harmonics and proposed the methods for prevention of harmonics through checking on transformer, rectifier and cable's capacities against harmonics with reference to KEPCO's electricity service standard. In order to analysis harmoninics of silicon rectifier that is power source in DC substation, computer simulations for a substation with TR of high voltage distribution switchboard are performed. Simulation results show that the total harmonic distortion factor becomes smaller for TR primary and receiving points in order rather than silicon rectifier which is harmonic generation source so that the harmonics generated frets each rectifier are outflowed to power supply and high voltage distribution switchboard The result of higher distortion factors of voltage and current for rectifier with 100% load than those with 50 % and 30% indicates that the waveform of voltage and current for the real substation power system at the office-going and the closing hours with heavy loads might be more distorted. As proposed methods for harmonic reduction, the conventional 6 pulse-type for substation is required to be replaced by 12 pulse-type for reduction of 5th and 7th harmonics. The active filter rather than the passive filter is more effective due to severe variance of rectifier loads, but the high cost is price to be paid. In view of installation area and costs, the use of 12 pulse-type transformer is desirable and then the parallel transformer and the rectifier within the substation must be replaced at the same time. Other substations with parallel feeder can use 6 pulse-type transformer.

A Study on Pulse Power Suppuy for Microwave Oven Using HVC Embedded High Frequency Transformer (HVC 내장형 고주파변압기를 이용한 Microwave Oven용 펄스전원장치에 관한 연구)

  • Park K.H.;Cho J.S.;Jung B.H.;Mok H.S.;Park H.B.
    • Proceedings of the KIPE Conference
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    • 2001.07a
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    • pp.584-588
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    • 2001
  • A conventional power supply to drive a microwave oven has ferro-resonant transformer and high voltage Capacitor(HVC). Though it is simple, transformer is bulky, heavy and has low-efficiency. To improve this defect a high frequency inverter type power supply has been investigated and developed in recent years. But, because of additional control circuit and switching device, inverter-type power supply is more expensive than conventional one. In this study, A new pulse power supply for Microwave Oven using novel HVC embedded high frequency transformer is proposed for down-sizing, cost reduction, and efficiency emprovement of Inverter type power supply. Also, equivalent circuit model is derived by impedance measurements. And the operation of proposed pulse power supply is verified by simulations and experimental results.

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Sinewave-PWM ZVS Inverter using High-Frequency Transformer for Utility AC Voltage Link

  • Chandhaket S.;Ogura K.;Konishi Y.;Nakaoka M.
    • Proceedings of the KIPE Conference
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    • 2003.07b
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    • pp.511-515
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    • 2003
  • This paper presents a novel prototype of the utility-interfaced sinusoidal pulse width modulated (SPWM) inverter using the high-frequency flyback transformer fur the small-scale solar photo-voltaic power conditioner (1kW - 4kW). The proposed SPWM power conditioner circuit with a high-frequency link has a function of electrical isolation, which is vital fur solar photovoltaic power conditioner systems with the viewpoint of safety and convenience. The discontinuous conduction mode (DCM) operation of the flyback transformer is also maintained to simplify the topology of the inverter circuit and control scheme. First, the operating principle of the proposed circuit is described far the understanding of the circuit parameters establishment. Then, the digitally constructed SPWM control scheme is presented. The proposed circuit is verified by the computer simulation and the prototype experiment.

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