Hitachi new inverters for 1500Vdc rolling stock

[bikkuri bahn]

Nuts and bolts news, some nice info in the article about inverter cooling:

Hitachi introduces smaller EMU inverter

05 June 2012

 

INVERTER: Hitachi has developed a silicon carbide hybrid inverter for electric multiple-units using a 1·5 kV overhead power supply. The inverter uses hybrid modules rated at 3·3 kV, which are approximately two-thirds the size of standard silicon modules.

 

http://www.railwaygazette.com/nc/news/single-view/view/hitachi-introduces-smaller-emu-inverter/archiv/2012/06.html

 

Japanese press release, of interest is the picture at the bottom comparing the new module with the old:

http://www.hitachi.co.jp/New/cnews/month/2012/04/0416.html

[miyakoji]

Hitachi has also developed proprietary soft-gate control technology to counter electromagnetic noise generated during AC/DC switching.  

so no more of that layered ....:::::iiiiiiiIIIIIIIIIIII

                                             ....:::::iiiiiiiIIIIIIIIIIII

                                                        ....:::::iiiiiiiIIIIIIIIIIII

 

noise?

[bikkuri bahn]

Recent inverters are very quiet, the ones on the 733/735 series up here in Hokkaido (they're Hitachi make), hardly make any noise.  The old GTO inverters really make a racket:

[The_Ghan]

Hitachi has also developed proprietary soft-gate control technology to counter electromagnetic noise generated during AC/DC switching.  

so no more of that layered ....:::::iiiiiiiIIIIIIIIIIII

                                             ....:::::iiiiiiiIIIIIIIIIIII

                                                        ....:::::iiiiiiiIIIIIIIIIIII

 

noise?

 

miyakoji,

 

Thanks .... I was wondering how to write that sound !!!     

 

Cheers

 

The_Ghan