• Title/Summary/Keyword: Pulse power

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Development of 60KV Pulsed Power Supply using IGBT Stacks (IGBT 직렬구동에 의한 60KV 펄스 전원장치 개발)

  • Ryoo, Hong-Je;Kim, Jong-Soo;Rim, Geun-Hie;Goussev, G.I.;Sytykh, D.
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.56 no.1
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    • pp.88-99
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    • 2007
  • In this paper, a novel new pulse power generator based on IGBT stacks is proposed for pulse power application. Because it can generate up to 60kV pulse output voltage without any step- up transformer or pulse forming network, it has advantages of fast rising time, easiness of pulse width variation and rectangular pulse shape. Proposed scheme consists of series connected 9 power stages to generate maximum 60kV output pulse and one series resonant power inverter to charge DC capacitor voltage. Each power stages are configured as 8 series connected power cells and each power cell generates up to 850VDC pulse. Finally pulse output voltage is applied using total 72 series connected IGBTs. To reduce component for gate power supply, a simple and robust gate drive circuit is proposed. For gating signal synchronization, full bridge invertor and pulse transformer generates on-off signals of IGBT gating with gate power simultaneously and it has very good characteristics of short circuit protection.

Pulsed Power Modulator based on IGBTs (IGBT 기반 고압 펄스전원장치)

  • Ryoo, H.J.
    • Proceedings of the KIPE Conference
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    • 2007.11a
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    • pp.43-46
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    • 2007
  • In this paper, a novel new pulse power generator based on IGBT stacks is proposed for pulse power application. Proposed scheme consists of series connected 9 power stages to generate maximum 60kV output pulse and one series resonant power inverter to charge DC capacitor voltage. Each power stages are configured as 8 series connected power cells and each power cell generates up to 850VDC pulse. Finally pulse output voltage is applied using total 72 series connected IGBTs. The synchronization of gating signal is important for series operation of IGBTs. For gating signal synchronization, full bridge inverter and pulse transformer generates on-off signals of IGBT gating and specially designed gate power circuit was used. Proposed scheme has lots of advantages such as long lifecyle, compact size, flat topped pulse forming, small weight, protection for arc, high efficiency and flexibility to generate various kinds of pulse output.

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Development of a High Voltage Pulse Power Supply with Battery Source (밧데리 전원을 이용한 고압 펄스 전원 장치 개발)

  • 강유리
    • Proceedings of the KIPE Conference
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    • 2000.07a
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    • pp.95-97
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    • 2000
  • With the increasing demands for clean environment development of air cleaning systems has been received increasing attention. Pulse power systems are widely used for air cleaning in the industrial applications. High voltage pulse power supply affects the performance of the overall environmental system. In this study high voltage micro pulse power supply for removing NOx in diesel engines is developed. The ratings of the pulse voltage is 20kV. The pulse width is 10usec and max. pulse repetition ratio is 1kHz.

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A Pulse Power Supply for Metal Vapor Lasers (금속 증기 레이저용 펄스 전원 장치)

  • Cha Byung Heon;Lee Heung Ho;Jin Jeong Tae
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.54 no.5
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    • pp.190-197
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    • 2005
  • A reliable and compact pulse power supply using a thyratron and a magnetic pulse compression (MPC) circuit was developed for a metal vapor laser. The life time of the pulse power supply is expected to be much longer than that of a conventional thyratron-discharge type pulse power supply. A thyratron generated a long pulse of its conduction pulse width 500 ns and then it was compressed to less than 80 ns of its output voltage rise time by a three stage MPC circuit. This pulse power supply was applied to a laser plasma tube of 30 mm inner diameter and 1.5 m discharge length. It was operated several hundreds hours without any troubles.

A Pulse Power Supply for a Metal Vapor Laser Using IGBTs (IGBT를 사용한 금속증기레이저용 펄스 전원)

  • 진정태;차병헌;김철중;이흥호
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.53 no.8
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    • pp.415-419
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    • 2004
  • A pulse power supply using IGBTs and MPC (magnetic pulse compression) circuit was developed for a metal vapor laser. The life time of the pulse power supply is expected to be much longer than that of a vacuum tube or thyratron type pulse power supply. A series-connected IGBT array generated a long pulse of its pulse width 2 ${\mu}\textrm{s}$ md then it was compressed to less than 100 ns by a three stage MPC circuit. This pulse power supply was applied to a laser plasma tube of 10 mm inner diameter and 0.5 m discharge length. and successfully operated.

Development of 60KV Pulse Power Supply using IGBT Stacks (IGBT 직렬구동에 의한 60KV 펄스 전원장치 개발)

  • Ryoo, H.J.;Kim, J.S.;Rim, G.H.;Sytykh, D.;Gussev, G.I.
    • Proceedings of the KIEE Conference
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    • 2006.07b
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    • pp.917-918
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    • 2006
  • In this paper, a novel new pulse power generatorbased on IGBT stacks is proposed for pulse power application. Proposed scheme consists of series connected 9power stages to generate maximum 60kV output pulse and one series resonant power inverter to charge DC capacitor voltage. Each power stages are configured as 8 series connected power cells and each power cell generates up to 850VDC pulse. Finally pulse output voltage is applied using total 72 series connected IGBTs. The synchronization of gating signal is importantfor series operation of IGBTs. For gating signal synchronization, full bridge inverter and pulse transformer generates on-off signals of IGBT gating and specially designed gate power circuit was used.

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Effect of Pulse Width Modulation Methods on Power Losses and Thermal Loadings of Single-Phase 5-Level NPC Inverters for PV Systems (전압 변조 방법에 따른 단상 5-레벨 NPC 태양광 인버터의 전력 손실 및 열 부하 분석)

  • Ryu, Taerim;Choi, Ui-Min
    • The Transactions of the Korean Institute of Power Electronics
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    • v.27 no.1
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    • pp.56-62
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    • 2022
  • In this paper, the effect of pulse width modulation methods on thermal loadings and power losses of single-phase five-level NPC inverters for photovoltaic systems are analyzed. The pulse width modulation methods affect the power losses of the NPC inverters and thus lead to different thermal loadings of NPC inverters. To identify the reliability-critical power device with respect to thermal stress, the thermal loadings of I- and T-type NPC inverters are analyzed by applying the unipolar pulse modulation method. Then, the effect of the discontinuous pulse width modulation method on power losses and thermal loadings of power devices of I- and T-type NPC inverters are analyzed. Finally, the operation of NPC inverters applying the discontinuous pulse modulation method is confirmed by experiments. The results show that the discontinuous pulse modulation method is able to improve the reliability of NPC inverters by reducing thermal loadings of reliability-critical power devices and it is more effective for T-type NPC inverters than I-type NPC inverters.

Improvement of extinction ratio of amplified pulses by incorporating a nonlinear optical loop mirror (EDFA로 증폭된 고출력 펄스 신호의 소광비 향상)

  • Kim, Byung-Jun;Choi, Hyun-Beom;Lee, Han-Hyub;Lee, Dong-Han;Kim, Dae-Yun;Kwon, Il-Bum
    • Korean Journal of Optics and Photonics
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    • v.14 no.2
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    • pp.189-193
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    • 2003
  • A two-stage erbium-doped fiber amplifier (EDFA) with a band pass filter is used to get optical pulses of high peak value. The pulse signal has a 32 ㏈ extinction ratio, 125 W peak power and 79 ㎽ pulse off power. A nonlinear optical loop mirror (NOLM) is used to lower the pulse off power so as to increase the extinction ratio. The pulse signal after the NOLM has a 50.4 ㏈ extinction ratio, 35 W peak power and 0.3 ㎽ pulse off power.

A Discrete-Amplitude Pulse Width Modulation for a High-Efficiency Linear Power Amplifier

  • Jeon, Young-Sang;Nam, Sang-Wook
    • ETRI Journal
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    • v.33 no.5
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    • pp.679-688
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    • 2011
  • A new discrete-amplitude pulse width modulation (DAPWM) scheme for a high-efficiency linear power amplifier is proposed. A radio frequency (RF) input signal is divided into an envelope and a phase modulated carrier. The low-frequency envelope is modulated so that it can be represented by a pulse whose area is proportional to its amplitude. The modulated pulse has at least two different pulse amplitude levels in order that the duty ratios of the pulse are kept large for small input. Then, an RF pulse train is generated by mixing the modulated envelope with the phase modulated carrier. The RF pulse train is amplified by a switching-mode power amplifier, and the original RF input signal is restored by a band pass filter. Because duty ratios of the RF pulse train are kept large in spite of a small input envelope, the DAPWM technique can reduce loss from harmonic components. Furthermore, it reduces filtering efforts required to suppress harmonic components. Simulations show that the overall efficiency of the pulsed power amplifier with DAPWM is about 60.3% for a mobile WiMax signal. This is approximately a 73% increase compared to a pulsed power amplifier with PWM.