Haruhiko Manabe

Next generation high efficiency high power dc-dc converter incorporating active switch and snubbing capacitor assisted full-bridge soft-switching PWM inverter with high frequency transformer for large current output

This paper presents a new circuit topology of dc busline switch-assisted full-bridge soft-switching PWM inverter type dc-dc power converter which is composed of typical voltage source H full-bridge type high frequency PWM inverter in addition to a single dc busline side power semiconductor switching device for PWM scheme and a capacitive lossless snubber. Under the newly-proposed high frequency inverter link dc-dc high power conditioning and processing circuit, all active power switches in the full-bridge arms and dc busline can achieve ZVS/ZVT turn-off commutation operation. On the other hand, although the conduction power loss of dc busline switch increases a little, the total turn-off switching losses of full-bridge type PWM inverter and dc busline switch with the single lossless capacitive snubber parallel with dc busline can be significantly decreased. As a result, the switching frequency of high frequency inverter power stage using IGBTs can be actually selected more than about 10 kHz. The more the switching frequency of full-bridge inverter increases, the more newly-proposed soft-switching dc-dc power converter with a high frequency transformer link has remarkable advantage as for the power conversion efficiency and power density as compared with the conventional hard-switching inverter type dc-dc power converter. The effectiveness of this new converter topology is proved for low voltage and large current dc-dc power supplies from a practical point of views.

Advanced high frequency transformer linked soft switching PWM DC-DC power converter with utility AC dual voltage modes for low voltage and large current applications

This paper presents two new circuit topologies of dc bus line series active snubber assisted soft switching PWM full-bridge dc-dc power converter acceptable for either utility ac 200 V-rms or ac 400 V-rms input voltage source. One of proposed power converters is composed of a typical voltage source full-bridge high frequency PWM inverter using dc bus line side series switching devices with the aid of a parallel capacitive lossless snubber. All the active power switches in the full-bridge arms and dc bus line can achieve ZCS turn-on and ZVS turn-off commutation operation and consequently the total turn-off switching losses can be significantly reduced. As a result, a high switching frequency for used IGBTs can be actually realized more than about 20 kHz. It is proved that the more the switching frequency of full-bridge inverter increases, the more soft switching PWM dc-dc power converter with a high frequency transformer link has remarkable advantages for its power conversion efficiency and power density as compared with the conventional hard switching PWM inverter type dc-dc converter. The effectiveness of this new converter topology is proved for low voltage and large current dc-dc power supplies as arc welding machine from a practical point of view

Selective Dual Utility AC Voltage Link Soft-Switching PWM Controlled DC-DC Power Converter with High Frequency Transformer for 36V-350A DC Loads

This paper presents two new circuit topologies of DC busline series active snubber assisted soft-switching PWM full-bridge DC-DC power converter acceptable for either utility AC 200 V-rms or AC 400 V-rms input voltage source. One of proposed power converters is composed of a typical voltage source full-bridge high frequency PWM inverter using DC busline side series switching devices with the aid of a parallel capacitive lossless snubber. All the active power switches in the full-bridge arms and DC busline can achieve ZCS turn-on and ZVS turn-off commutation operation and consequently the total turn-off switching losses can be significantly reduced. As a result, a high switching frequency for used IGBTs can be actually realized more than about 20 kHz. It is proved that the more the switching frequency of full-bridge inverter increases, the more soft-switching PWM DC-DC power converter with a high frequency transformer link has remarkable advantages for its power conversion efficiency and power density as compared with the conventional hard-switching PWM inverter type DC-DC converter. The effectiveness of this new converter topology is proved for low voltage and large current DC-DC power supplies as arc welding machine from a practical point of view

Dual utility AC voltage line operated soft switching PWM DC-DC power converter with high frequency transformer link for arc welding equipment

This paper presents two new circuit topologies of DC busline series active snubber assisted soft switching PWM full-bridge DC-DC power converter acceptable for either utility AC 200 V-rms or AC 400 V-rms input voltage source. Proposed power converters are composed of a typical voltage source full-bridge high frequency PWM inverter using DC busline side series switching devices with the aid of a parallel capacitive lossless snubber. All the active power switches in the full-bridge arms and DC busline can achieve ZCS turn-on and ZVS turn-off commutation operation and consequently the total turn-off switching losses can be significantly reduced. As a result, a high switching frequency for used IGBTs can be actually realized more than about 20 kHz. It is proved that the more the switching frequency of full-bridge inverter increases, the more soft switching PWM DC-DC power converter with a high frequency transformer link has remarkable advantages for its power conversion efficiency and power density as compared with the conventional hard switching PWM inverter type DC-DC converter. The effectiveness of this new converter topology is proved for low voltage and large current DC-DC power supplies as arc welding machine from a practical point of view

Novel input DC buslines side active soft- switching cells-assisted symmetrical PWM DC-DC converters with center-rapped HF transformer link rectifier

This paper deals with a new circuit prototype of two active edge resonant cells-assisted soft-switching symmetrical PWM half-bridge inverter type DC-DC high power converter employing a high frequency planar transformer with center-tapped secondary windings and rectifier with choke-input. Its operating principle is described in detail by using switching mode transition equivalent circuits which is determined under particular switching pulse timing pattern scheme as symmetrical PWM strategy, together with its unique inherent features. The performance evaluations of its experimental PCB converter setup using IGBT power modules are actually illustrated on the basis of the power loss analysis vs. switching frequency. The practical effectiveness of new high frequency isolated DC-DC power converter treated here is particularly proved for low voltage and large current DC output implementation as high performance arc welding machines in industry. Moreover, the extended circuit topologies of DC-DC high power converter treated here and selective dual mode symmetrical PWM scheme operating at soft commutation are also demonstrated for not only large current and low voltage setting but also low current low voltage conditions.

An innovative DC busline active snubber-assisted soft switching PWM DC-DC power supply with high frequency transformer for high performance arc welder

This paper presents three novel circuit topologies of voltage source soft switching PWM inverter with full-bridge or half-bridge configurations suitable for either utility ac 200 V-rms or ac 400 V-rms input arid line. The proposed power converters are composed of typical full-bridge or half-bridge inverter and additional power semiconductor switching devices for dc busline PWM series switching with the aid of lossless capacitive snubbers. Under the newly-proposed soft switching PWM dc-dc power converter circuits with high frequency transformer, all the active power switches in the full-bridge arms or half-bridge arm and dc busline can actively achieve ZVS turn-off and ZCS or ZVS/ZCS turn-on commutation operation and consequently the total turn-off switching losses can be significantly reduced. As a result, a high switching frequency for used IGBTs can be actually realized more than about 20 kHz. It is proved that the more the switching frequency of full-bridge or half-bridge inverter increases, the more soft switching PWM dc-dc power converter with a high frequency transformer has remarkable advantages for its power conversion efficiency and power density as compared with the conventional hard switching PWM inverter type dc-dc converters. The effectiveness of this new converter topologies are proved for low voltage and large current dc-dc power supplies as arc welding machine from a practical point of view.

Latest Development of A Novel Half Bridge Soft Switching PWM Inverter-Fed DC-DC Converter for Arc Welding Machines

This paper presents a new DC-DC converter circuit topology using voltage source-fed soft-switching PWM high frequency inverter with half bridge configuration. This type of DC-DC converter circuit has two semiconductor switching devices in series with high and low DC buslines, two lossless snubbing capacitors in parallel with two connected additional diode components. Under the newly proposed high frequency soft-switching PWM inverter link DC-DC converter circuit connected for utility ac 400V-rms input grid on the basis of divided smoothing capacitor type half bridge inverter. Its active power switches (IGBTs) can achieve ZCS turn-on commutation operation and ZVS turn-off commutation operation. Consequently, the total turn-off switching power losses of IGBTs can be significantly reduced for higher frequency. As a result, a high switching frequency operation for IGBTs used in this circuit can be actually implemented at a switching frequency more than about 20 kHz. It is proved that the more the switching frequency of half bridge inverter increases, the more soft switching PWM DC-DC converters with a high frequency transformer have remarkable advantages for its power conversion efficiency and power density as compared with the conventional full-bridge type soft switching PWM DC-DC converter with DC rail side auxiliary edge resonant sunbbers that the authors have proposed previously. The practical effectiveness of these new converter topologies are substantially confirmed for low voltage and large current do power supplies as high performance arc welding machine from a practical point of view. キーワ-ド: ハー フブ リッジ高周波イ ンバー タ, DC-DCコ ンバータ, 高周波 トランス漏れインダクタンス, 直流バ スライン並列追 加部分共振 コンデ ンサ, 直流バスライ ン直列追加 スイ ッチ, ソフ トスイ ッチ ングPWM, 高性能アーク溶接機