Vhiki rino tinoenderera mberi nechinyorwa chesvondo rapfuura.

1.2 Ma capacitor emagetsi

Dielectric inoshandiswa muma capacitors emagetsi ialuminium oxide inoumbwa nekuora kwealuminium, ine dielectric constant ye8 kusvika 8.5 uye simba re dielectric rinoshanda reinenge 0.07V/A (1µm=10000A). Zvisinei, hazvigoneke kuwana ukobvu hwakadaro. Ukobvu hwealuminium layer hunoderedza capacity factor (specific capacitance) yema electrolytic capacitors nekuti aluminium foil inofanira kuchekwa kuti igadzire aluminium oxide film kuti iwane hunhu hwakanaka hwekuchengetera simba, uye pamusoro payo pachaumbwa nzvimbo dzakawanda dzisina kuenzana. Kune rumwe rutivi, resistivity ye electrolyte i150Ωcm yevoltage yakaderera uye 5kΩcm yevoltage yakakwira (500V). Resistivity yakakwira ye electrolyte inoganhurira RMS current iyo electrolytic capacitor inogona kutsungirira, kazhinji kusvika 20mA/µF.

Nekuda kwezvikonzero izvi, ma capacitor emagetsi akagadzirwa kuti akwanise kusvitsa voltage ye450V (vamwe vagadziri vega vega vanogadzira 600V). Saka, kuti uwane voltage yakakwira, zvinodikanwa kuti uzviwane nekubatanidza ma capacitor akatevedzana. Zvisinei, nekuda kwemusiyano wekudzivirira kupinza kwe capacitor yega yega yemagetsi, resistor inofanira kubatanidzwa kune capacitor yega yega kuitira kuti voltage ye capacitor yega yega yakabatana ienzane. Pamusoro pezvo, ma capacitor emagetsi imidziyo ine polarized, uye kana voltage inoshandiswa inodarika 1.5 times Un, electrochemic reaction inoitika. Kana voltage inoshandiswa inodzokera shure yareba zvakakwana, capacitor inodururwa. Kuti udzivise chiitiko ichi, diode inofanira kubatanidzwa padivi pe capacitor yega yega painoshandiswa. Kunze kweizvozvo, voltage inodzokera shure ye electrolytic capacitors inowanzo kuve 1.15 times Un, uye yakanaka inogona kusvika 1.2 times Un. Saka vagadziri havafanire kufunga nezve steady-state working voltage chete asiwo surge voltage pavanoishandisa. Muchidimbu, tafura inotevera yekufananidza pakati pemacapacitor efirimu nemacapacitor emagetsi inogona kudhirowa, ona Mufananidzo 1.

2. Kuongorora Mashandisirwo

Macapacitor eDC-Link semafirita anoda magadzirirwo emagetsi ane simba rakawanda uye ane simba rakawanda. Muenzaniso ndiyo sisitimu huru yekufambisa mota yemotokari itsva ine simba sezvataurwa muMufananidzo 3. Mukushandisa uku, capacitor inoita basa rekuparadzanisa uye dunhu rine simba rakawanda rekushanda. Capacitor yefirimu yeDC-Link ine mukana wekukwanisa kutsungirira magetsi makuru ekushanda (Irms). Tora maparamita emotokari itsva ane simba re50~60kW semuenzaniso, maparamita acho ndeaya anotevera: voltage yekushandisa 330 Vdc, ripple voltage 10Vrms, ripple current 150Arms@10KHz.

Zvadaro simba remagetsi rishoma rinoverengwa seizvi:

Izvi zviri nyore kushandisa pakugadzira macapacitor efirimu. Kana tichifunga kuti macapacitor emagetsi anoshandiswa, kana 20mA/μF ikafungidzirwa, capacitance shoma ye electrolytic capacitors inoverengerwa kuti isvike pamatanho ari pamusoro apa seinotevera:

Izvi zvinoda ma capacitor akawanda e electrolytic akabatana pamwe chete kuti awane capacitance iyi.

Mukushandiswa kwemagetsi akawandisa, senge njanji yemagetsi, mabhazi emagetsi, metro, nezvimwewo. Tichifunga kuti masimba aya akabatana nepantograph yemotokari kuburikidza nepantograph, kubatana pakati pepantograph nepantograph kunoitika panguva yekufamba. Kana zviviri izvi zvisina kubatana, simba remagetsi rinotsigirwa neDC-L ink capacitor, uye kana kubatana kwadzoserwa, over-voltage inogadzirwa. Nyaya yakaipisisa ndeyekuburitsa zvachose neDC-Link capacitor kana yabviswa, uko discharge voltage yakaenzana nepantograph voltage, uye kana kubatana kwadzoserwa, over-voltage inobuda inenge kaviri pane yakayerwa Un inoshanda. Kune macapacitor efirimu, DC-Link capacitor inogona kubatwa pasina kufunga nezvekuwedzera. Kana macapacitor emagetsi akashandiswa, over-voltage i1.2Un. Tora Shanghai metro semuenzaniso. Un=1500Vdc, kuti electrolytic capacitor ifunge nezve voltage ndeiyi:

Zvadaro ma capacitor matanhatu e450V anofanira kubatanidzwa akatevedzana. Kana dhizaini ye capacitor yefirimu ikashandiswa mu600Vdc kusvika 2000Vdc kana kunyange 3000Vdc inowanikwa zviri nyore. Pamusoro pezvo, simba kana richiburitswa zvizere, capacitor inoita discharge ye short circuit pakati pema electrodes maviri, zvichigadzira inrush current yakakura kuburikidza neDC-Link capacitor, iyo inowanzosiyana kuti ma capacitor e electrolytic asvike pazvinodiwa.

Pamusoro pezvo, zvichienzaniswa nemacapacitor emagetsi, macapacitor eDC-Link film anogona kugadzirwa kuti awane ESR yakaderera zvikuru (kazhinji iri pasi pe10mΩ, uye kunyange yakaderera <1mΩ) uye self-inductance LS (kazhinji iri pasi pe100nH, uye mune dzimwe nguva iri pasi pe10 kana 20nH). Izvi zvinobvumira DC-Link film capacitor kuiswa zvakananga muIGBT module kana yaiswa, zvichibvumira bus bar kubatanidzwa muDC-Link film capacitor, nokudaro zvichibvisa kudiwa kweIGBT absorber capacitor yakatsaurirwa pakushandisa macapacitor efirimu, zvichiponesa mugadziri mari yakawanda. Mufananidzo 2. ne3 unoratidza hunyanzvi hwezvimwe zvezvigadzirwa zveC3A neC3B.

3. Mhedziso

Kare kare, macapacitor eDC-Link aive akawanda macapacitor emagetsi nekuda kwemitengo uye saizi.

Zvisinei, ma capacitor emagetsi anokanganiswa nekugona kwemagetsi uye kugona kwemagetsi kumisa magetsi (ESR yakakwira zvikuru kana tichienzanisa nema capacitor efirimu), saka zvakakosha kubatanidza ma capacitor akawanda emagetsi akatevedzana uye akafanana kuitira kuti uwane kugona kukuru uye kusangana nezvinodiwa zvekushandiswa kwemagetsi akawanda. Pamusoro pezvo, tichifunga nezvekusagadzikana kwezvinhu zvemagetsi, zvinofanirwa kutsiviwa nguva nenguva. Mashandisirwo matsva esimba anowanzoda hupenyu hwechigadzirwa hwemakore gumi nemashanu, saka chinofanira kutsiviwa kaviri kusvika katatu munguva ino. Nokudaro, pane mutengo wakakura uye kusagadzikana mubasa remuchina wese mushure mekutengesa. Nekuvandudzwa kwetekinoroji yesimbi uye tekinoroji yecapacitor yefirimu, zvave zvichikwanisika kugadzira ma capacitor eDC filter ane simba rakawanda ane voltage kubva ku450V kusvika ku1200V kana kupfuura nefirimu reOPP rakatetepa zvakanyanya (2.7µm yakatetepa, kunyange 2.4µm) uchishandisa tekinoroji yesafety film vaporization. Kune rumwe rutivi, kubatanidzwa kwemacapacitor eDC-Link nebhazi kunoita kuti dhizaini yemuchina wemagetsi we inverter ive diki uye inoderedza zvakanyanya kudonha kwemuchina wemagetsi we circuit kuti igadzirise circuit.