These days I'm crazy busy,I was in many troubles during the last past 2 months, and now It's seems that my nightmare is coming to the end, becouse I've finished the 0.5KW~3KW EPS series models and all destroyer test numbers shows the sys works well.
Some part test result as follow,
Machine model: BD-S3KW(EPS-3KW)
Temp:23℃
Humi:80%
-------------------------------------------------
1,inverter status empty loade test
  battery voltage:54V
  output voltage:220V
  frequency:50HZ
  battery current:0.67A
  noise:<40dB
------------------------------------------
2 inverter status full loade test
  loade:600W(resistance)+1.7kw(fluorescence lights,Λ=0.6)+1.5kw(air compressor)
  soft start: OK
full loade concuss test:OK
efficiency:98%
sine wave distortion: bad distortion of course can work
------------------------------------
3 charge test
totale time<20h ,When the battery charged to 95%

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Inner structure design in 3D which make us easy to control the details!!!!

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Main inverter sys module struture! And We own the patent right,which make the after service very convenience and easy!!
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the finished product appearance!
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外觀沒什么好看.一種設(shè)計(jì)理念.關(guān)鍵性能表現(xiàn):3KW-48V的EPS能帶600W+1.7KW(功率因數(shù)為0.6應(yīng)急燈)+1.5KW空氣壓縮機(jī)器.試問哪一臺(tái)機(jī)器能輕松做到?

主變是工頻變壓器還是高頻變壓器?

是工頻隔離變壓器輸出

工頻變壓器只是隔離不升壓?jiǎn)?還是既升壓又隔離?

都有.目前是按照載波16KHZ頻率設(shè)計(jì).
xzszrs兄,假如我把SPWM載頻提高到100KHZ可以大幅度降低變壓器體積.
你說呢?

我說嘛,變壓器輸入的是兩種信號(hào)成分:工頻和載頻,輸出的是工頻,也就是說傳遞的功率信號(hào)是工頻,所以它必需按照工頻變壓器的標(biāo)準(zhǔn)設(shè)計(jì),另一方面,它又要考濾載頻的輸入損耗,包擴(kuò)銅損和鐵損,這里忽略銅損,主要考濾鐵損,鐵損隨載頻的升高并不是線性減小的,在5K以下下降曲線較陡,5K-20K下降緩慢,20K以上還會(huì)從某個(gè)點(diǎn)緩慢增加.所以說提高載頻很難大幅度減小工頻變壓器的體積.提高載頻到一定成度就只能白白地增加開關(guān)損耗了.SPWM工頻變壓器是工頻變壓器,但又比工頻變壓器要求高,要減小體積除了要合理選擇載頻外,更要選擇高導(dǎo)磁率高飽和點(diǎn)的鐵芯,
    要大幅度減小EPS整機(jī)的體積只有做高頻機(jī),徹底地革除工頻主變!

我指的變壓器設(shè)計(jì)是采用鐵氧體磁心的EE-70的高頻變壓器.
假如任然按照工頻設(shè)計(jì)顯然會(huì)硅剛片飽和,損耗增加,溫度直線上升!
必須按照200KHZ的頻率設(shè)計(jì)高頻變壓器.
結(jié)果主要考慮是否會(huì)帶載性能下降.
假如結(jié)果只能帶一些容阻性負(fù)載,那也沒多大意義.

你想用EE70做SPWM輸出變壓器?

呵呵,只是想象!沒試過.
這幾天一直在考慮如何把那笨重的家伙去掉.

千萬別試,會(huì)短路的.你有沒有看明白我上面那段話,你要減小體積就先DC/DC到360V,再DC-AC到220C,主變就可用高頻的了.要隔離就做DC-DC隔離,還有驅(qū)動(dòng)隔離.

!!!
這個(gè)辦法我可考慮過.顯然帶載性能不行呢!

誰說帶載不行,我?guī)展鉄粼囘^,也沒看到正弦波有明顯畸變.

按照功率1:1的配比能帶電機(jī)+節(jié)能燈的混合負(fù)載嗎?

現(xiàn)在我的3KWEPS,600W(電阻負(fù)載)+1.5KW空機(jī)+1.7KW(人=0.6)節(jié)能燈,DC啟動(dòng),滿負(fù)荷沖擊,轉(zhuǎn)換隨便怎么搞都非常穩(wěn)定.
我想按照你那種設(shè)計(jì)的高頻不可能做到這些.當(dāng)然帶感性負(fù)載時(shí)候會(huì)目前還有些畸變.

目前測(cè)試的空載DC電流損耗在0.65A

只單獨(dú)帶過風(fēng)扇,沒問提.

0.65A還是比較大,我做了一個(gè)12V500W帶工頻變壓器的SPWM.DC空載0.3A.變壓器變比為:12V/220V/390V.

目前也正在優(yōu)化.功率增大空載電流也會(huì)增加.應(yīng)該適當(dāng)?shù)靥幚硪幌骂l率和驅(qū)動(dòng)的GND布局對(duì)空載損耗值會(huì)得到很大改善!之前我測(cè)過其他同等功率的機(jī)器有的達(dá)到1A電流!

減低空載損耗主要在變壓器.