OBC 車載充(chong)(chong)電(dian)(dian)機是新(xin)能(neng)源汽(qi)車將電(dian)(dian)網交(jiao)流電(dian)(dian)轉換為(wei)適(shi)配動力電(dian)(dian)池(chi)直流電(dian)(dian)的(de)關(guan)(guan)鍵設(she)備，其效(xiao)率直接影(ying)響充(chong)(chong)電(dian)(dian)速度與(yu)能(neng)耗，關(guan)(guan)乎用戶(hu)使用成本與(yu)車輛性能(neng)，因此 OBC 車載充(chong)(chong)電(dian)(dian)機效(xiao)率測(ce)試意(yi)義重大。
測(ce)(ce)試(shi)(shi)(shi)原理基于能(neng)(neng)量(liang)守恒定律，通過測(ce)(ce)量(liang)充(chong)(chong)電(dian)(dian)(dian)(dian)機輸(shu)(shu)入的(de)(de)(de)電(dian)(dian)(dian)(dian)能(neng)(neng)與輸(shu)(shu)出給(gei)電(dian)(dian)(dian)(dian)池的(de)(de)(de)電(dian)(dian)(dian)(dian)能(neng)(neng)，二者比值即為(wei)充(chong)(chong)電(dian)(dian)(dian)(dian)機效率。目前常用(yong)的(de)(de)(de)測(ce)(ce)試(shi)(shi)(shi)方法(fa)是直(zhi)接(jie)測(ce)(ce)量(liang)法(fa)，需搭建專業的(de)(de)(de)測(ce)(ce)試(shi)(shi)(shi)平臺，平臺包括高精度功率分析儀、可編程交流電(dian)(dian)(dian)(dian)源(yuan)、電(dian)(dian)(dian)(dian)子負載等(deng)設備。測(ce)(ce)試(shi)(shi)(shi)時(shi)，先將(jiang) OBC 車載充(chong)(chong)電(dian)(dian)(dian)(dian)機連(lian)接(jie)至測(ce)(ce)試(shi)(shi)(shi)平臺，設定不同的(de)(de)(de)輸(shu)(shu)入電(dian)(dian)(dian)(dian)壓、頻(pin)率以及(ji)輸(shu)(shu)出電(dian)(dian)(dian)(dian)流、電(dian)(dian)(dian)(dian)壓工況，模擬實際使用(yong)場景。在每個(ge)工況下，利用(yong)功率分析儀精確測(ce)(ce)量(liang)充(chong)(chong)電(dian)(dian)(dian)(dian)機的(de)(de)(de)輸(shu)(shu)入功率和輸(shu)(shu)出功率，計(ji)算效率值。
實際測試(shi)流程(cheng)中，需全面覆(fu)蓋充(chong)電(dian)(dian)(dian)機(ji)的工作范圍，如從低功率(lv)(lv)涓流充(chong)電(dian)(dian)(dian)到高功率(lv)(lv)快速(su)充(chong)電(dian)(dian)(dian)的不同階段。同時，考慮溫(wen)度(du)對充(chong)電(dian)(dian)(dian)機(ji)效(xiao)(xiao)率(lv)(lv)的影響，在測試(shi)過程(cheng)中監(jian)測充(chong)電(dian)(dian)(dian)機(ji)的溫(wen)度(du)變化(hua)，分析效(xiao)(xiao)率(lv)(lv)隨溫(wen)度(du)的波動情況(kuang)。根據行(xing)業標(biao)準，OBC 車(che)載充(chong)電(dian)(dian)(dian)機(ji)在額定工況(kuang)下的效(xiao)(xiao)率(lv)(lv)一般(ban)需達到 90% 以上 ，通(tong)過效(xiao)(xiao)率(lv)(lv)測試(shi)，可評估充(chong)電(dian)(dian)(dian)機(ji)性能是否達標(biao)，為產品優(you)化(hua)與(yu)選型提供依據。
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