現代開關電源有兩種(zhong)(zhong)：一種(zhong)(zhong)是(shi)直(zhi)(zhi)流(liu)(liu)(liu)開(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)；另一種(zhong)(zhong)是(shi)交流(liu)(liu)(liu)開(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)。這里主要介紹的(de)(de)(de)只是(shi)直(zhi)(zhi)流(liu)(liu)(liu)開(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)，其功能是(shi)將電(dian)(dian)(dian)(dian)(dian)(dian)能質量較(jiao)差(cha)的(de)(de)(de)原(yuan)生態(tai)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)（粗電(dian)(dian)(dian)(dian)(dian)(dian)），如市電(dian)(dian)(dian)(dian)(dian)(dian)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)或蓄(xu)電(dian)(dian)(dian)(dian)(dian)(dian)池(chi)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)，轉(zhuan)換成滿足設(she)備要求的(de)(de)(de)質量較(jiao)高的(de)(de)(de)直(zhi)(zhi)流(liu)(liu)(liu)電(dian)(dian)(dian)(dian)(dian)(dian)壓（精(jing)電(dian)(dian)(dian)(dian)(dian)(dian)）。直(zhi)(zhi)流(liu)(liu)(liu)開(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)的(de)(de)(de)核(he)心是(shi)DC/DC轉(zhuan)換器。因此直(zhi)(zhi)流(liu)(liu)(liu)開(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)的(de)(de)(de)分(fen)(fen)類(lei)是(shi)依賴(lai)DC/DC轉(zhuan)換器分(fen)(fen)類(lei)的(de)(de)(de)。也(ye)就是(shi)說，直(zhi)(zhi)流(liu)(liu)(liu)開(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)的(de)(de)(de)分(fen)(fen)類(lei)與DC/DC轉(zhuan)換器的(de)(de)(de)分(fen)(fen)類(lei)是(shi)基本(ben)相(xiang)同(tong)的(de)(de)(de)，DC/DC轉(zhuan)換器的(de)(de)(de)分(fen)(fen)類(lei)基本(ben)上就是(shi)直(zhi)(zhi) 流(liu)(liu)(liu)開(kai)(kai)關(guan)電(dian)(dian)(dian)(dian)(dian)(dian)源(yuan)(yuan)(yuan)的(de)(de)(de)分(fen)(fen)類(lei)。

　　直(zhi)流DC/DC轉換(huan)器按輸入與(yu)輸出之間是(shi)否有電(dian)氣隔(ge)離(li)可以分(fen)為兩類：一(yi)類是(shi)有隔(ge)離(li)的稱(cheng)為隔(ge)離(li)式DC/DC轉換(huan)器；另一(yi)類是(shi)沒有隔(ge)離(li)的稱(cheng)為非隔(ge)離(li) 式DC/DC轉換(huan)器。

　　隔離式DC/DC轉(zhuan)換(huan)(huan)器(qi)也可以按有(you)(you)源功率器(qi)件(jian)的個數來(lai)分類。單(dan)管的DC/DC轉(zhuan)換(huan)(huan)器(qi)有(you)(you)正激式（Forward）和反激式（Flyback）兩種。雙管DC/DC轉(zhuan)換(huan)(huan)器(qi) 有(you)(you)雙管正激式（DoubleTransistor Forward Converter），雙管反激式（Double Transistor Flyback Converter）、推挽式（Push-Pull Converter） 和半橋(qiao)式（Half-Bridge Converter）四(si)種。四(si)管DC/DC轉(zhuan)換(huan)(huan)器(qi)就是全橋(qiao)DC/DC轉(zhuan)換(huan)(huan)器(qi)（Full-Bridge Converter）。

非隔離(li)式DC/DC轉換(huan)器，按有源功(gong)率器件(jian)的個(ge)數，可(ke)以分(fen)為(wei)單管、雙(shuang)管和四管三(san)類。
　　單管(guan)DC/DC轉(zhuan)(zhuan)換(huan)器(qi)(qi)(qi)(qi)共有六(liu)種，即(ji)降壓(ya)式（Buck）DC/DC轉(zhuan)(zhuan)換(huan)器(qi)(qi)(qi)(qi) ，升(sheng)壓(ya)式（Boost）DC/DC轉(zhuan)(zhuan)換(huan)器(qi)(qi)(qi)(qi)、升(sheng)壓(ya)降壓(ya)式（Buck Boost）DC/DC轉(zhuan)(zhuan)換(huan)器(qi)(qi)(qi)(qi)、Cuk DC/DC轉(zhuan)(zhuan)換(huan)器(qi)(qi)(qi)(qi)、Zeta DC/DC轉(zhuan)(zhuan)換(huan)器(qi)(qi)(qi)(qi)和SEPIC DC/DC轉(zhuan)(zhuan)換(huan)器(qi)(qi)(qi)(qi)。在這六(liu)種 單管(guan)DC/DC轉(zhuan)(zhuan)換(huan)器(qi)(qi)(qi)(qi)中(zhong)，Buck和Boost式DC/DC轉(zhuan)(zhuan)換(huan)器(qi)(qi)(qi)(qi)是基本(ben)的(de)(de)，Buck-Boost、Cuk、Zeta、SEPIC式DC/DC轉(zhuan)(zhuan)換(huan)器(qi)(qi)(qi)(qi)是從中(zhong)派生出(chu)來的(de)(de)。雙管(guan)DC/DC轉(zhuan)(zhuan)換(huan) 器(qi)(qi)(qi)(qi)有雙管(guan)串(chuan)接的(de)(de)升(sheng)壓(ya)式（Buck-Boost）DC/DC轉(zhuan)(zhuan)換(huan)器(qi)(qi)(qi)(qi)。四管(guan)DC/DC轉(zhuan)(zhuan)換(huan)器(qi)(qi)(qi)(qi)常(chang)用的(de)(de)是全橋DC/DC轉(zhuan)(zhuan)換(huan)器(qi)(qi)(qi)(qi)（Full-Bridge Converter）。

隔離式DC/DC轉換器(qi)在實(shi)現輸(shu)出(chu)與輸(shu)入電(dian)(dian)氣隔離時，通常采用變壓(ya)器(qi)來實(shi)現，由于(yu)變壓(ya)器(qi)具有(you)變壓(ya)的(de)功能(neng)，所以有(you)利于(yu)擴大轉換器(qi)的(de)輸(shu)出(chu)應用 范(fan)圍，也便于(yu)實(shi)現不同(tong)電(dian)(dian)壓(ya)的(de)多(duo)路(lu)輸(shu)出(chu)，或(huo)相同(tong)電(dian)(dian)壓(ya)的(de)多(duo)種輸(shu)出(chu)。
在功率(lv)(lv)開(kai)關(guan)管(guan)的(de)電壓和(he)電流定額相同(tong)時，轉換(huan)器(qi)的(de)輸出功率(lv)(lv)通常與所用(yong)開(kai)關(guan)管(guan)的(de)數量成正比。所以開(kai)關(guan)管(guan)數越多，DC/DC轉換(huan)器(qi)的(de)輸出功率(lv)(lv)越大，四(si)管(guan)式比兩(liang)管(guan)式輸出功率(lv)(lv)大一倍(bei)，單管(guan)式輸出功率(lv)(lv)只有四(si)管(guan)式的(de)1/4。
非隔(ge)離式轉換器(qi)與隔(ge)離式轉換器(qi)的組合，可以(yi)得到單個(ge)轉換器(qi)所(suo)不具備的一些特性(xing)。
按能(neng)量的(de)傳(chuan)輸(shu)來分，DC/DC轉(zhuan)換器(qi)有(you)單向(xiang)(xiang)(xiang)傳(chuan)輸(shu)和雙向(xiang)(xiang)(xiang)傳(chuan)輸(shu)兩種。具有(you)雙向(xiang)(xiang)(xiang)傳(chuan)輸(shu)功能(neng)的(de)DC/DC轉(zhuan)換器(qi)，既可(ke)以從(cong)電源(yuan)側(ce)向(xiang)(xiang)(xiang)負載側(ce)傳(chuan)輸(shu)功率(lv)，也可(ke) 以從(cong)負載側(ce)向(xiang)(xiang)(xiang)電源(yuan)側(ce)傳(chuan)輸(shu)功率(lv)。
DC/DC轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器也(ye)可以分為自(zi)(zi)激(ji)式(shi)和他(ta)控(kong)式(shi)。借助轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器本(ben)身的(de)正反饋信號實現開(kai)關(guan)管(guan)自(zi)(zi)持周(zhou)期性開(kai)關(guan)的(de)轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器，叫做(zuo)自(zi)(zi)激(ji)式(shi)轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器，如洛耶爾 （Royer）轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器就是(shi)一(yi)種典型的(de)推(tui)挽(wan)自(zi)(zi)激(ji)式(shi)轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器。他(ta)控(kong)式(shi)DC/DC轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器中的(de)開(kai)關(guan)器件(jian)控(kong)制信號，是(shi)由外(wai)部專(zhuan)門(men)的(de)控(kong)制電路產生(sheng)的(de)。

按照(zhao)開關(guan)管的開關(guan)條(tiao)件，DC/DC轉換器(qi)又可以分為硬開關(guan)（Hard Switching）
和(he)(he)軟(ruan)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)（Soft Switching）兩(liang)種(zhong)。硬開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)DC/DC轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器(qi)(qi)的(de)(de)(de)(de)(de)(de)(de)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)器(qi)(qi)件(jian)(jian) 是(shi)(shi)在承(cheng)受電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓或(huo)(huo)(huo)流(liu)過(guo)(guo)(guo)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)的(de)(de)(de)(de)(de)(de)(de)情況下(xia)，開(kai)(kai)(kai)(kai)通(tong)或(huo)(huo)(huo)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)斷(duan)(duan)(duan)(duan)(duan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)的(de)(de)(de)(de)(de)(de)(de)，因(yin)(yin)此在開(kai)(kai)(kai)(kai)通(tong)或(huo)(huo)(huo)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)斷(duan)(duan)(duan)(duan)(duan)過(guo)(guo)(guo)程中將會產生(sheng)(sheng)較大的(de)(de)(de)(de)(de)(de)(de)交疊(die)損(sun)(sun)(sun)耗(hao)(hao)(hao)，即(ji)(ji)所謂的(de)(de)(de)(de)(de)(de)(de)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)損(sun)(sun)(sun)耗(hao)(hao)(hao)（Switching loss）。當轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器(qi)(qi)的(de)(de)(de)(de)(de)(de)(de)工作(zuo)狀(zhuang)態(tai)一(yi)定(ding)時(shi)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)損(sun)(sun)(sun)耗(hao)(hao)(hao)也是(shi)(shi)一(yi)定(ding)的(de)(de)(de)(de)(de)(de)(de)，而且開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)頻(pin)率(lv)(lv)越高(gao)，開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)損(sun)(sun)(sun)耗(hao)(hao)(hao)越大，同時(shi)在開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)過(guo)(guo)(guo)程中還會激起電(dian)(dian)(dian)(dian)(dian)(dian)(dian)路(lu)分(fen)布電(dian)(dian)(dian)(dian)(dian)(dian)(dian)感和(he)(he)寄(ji)生(sheng)(sheng) 電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容的(de)(de)(de)(de)(de)(de)(de)振蕩(dang)，帶(dai)來(lai)附加(jia)損(sun)(sun)(sun)耗(hao)(hao)(hao)，因(yin)(yin)此，硬開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)DC/DC轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器(qi)(qi)的(de)(de)(de)(de)(de)(de)(de)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)頻(pin)率(lv)(lv)不(bu)能太高(gao)。軟(ruan)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)DC/DC轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器(qi)(qi)的(de)(de)(de)(de)(de)(de)(de)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)管(guan)，在開(kai)(kai)(kai)(kai)通(tong)或(huo)(huo)(huo)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)斷(duan)(duan)(duan)(duan)(duan)過(guo)(guo)(guo)程中，或(huo)(huo)(huo)是(shi)(shi)加(jia)于(yu) 其上(shang)的(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓為(wei)零(ling)(ling)(ling)，即(ji)(ji)零(ling)(ling)(ling)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)（Zero-Voltage-Switching，ZVS），或(huo)(huo)(huo)是(shi)(shi)通(tong)過(guo)(guo)(guo)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)管(guan)的(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)為(wei)零(ling)(ling)(ling)，即(ji)(ji)零(ling)(ling)(ling)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)（Zero-Current·Switching，ZCS）。這種(zhong)軟(ruan)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)方(fang)式(shi)可(ke)以(yi)(yi)顯著(zhu)地(di)減(jian)(jian)小(xiao)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)損(sun)(sun)(sun)耗(hao)(hao)(hao)，以(yi)(yi)及開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)過(guo)(guo)(guo)程中激起的(de)(de)(de)(de)(de)(de)(de)振蕩(dang)，使(shi)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)頻(pin)率(lv)(lv)可(ke)以(yi)(yi)大幅度提高(gao)，為(wei)轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器(qi)(qi)的(de)(de)(de)(de)(de)(de)(de)小(xiao)型化和(he)(he)模塊化創造 了條(tiao)(tiao)件(jian)(jian)。功(gong)率(lv)(lv)場效(xiao)應(ying)管(guan)（MOSFET）是(shi)(shi)應(ying)用(yong)較多的(de)(de)(de)(de)(de)(de)(de)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)器(qi)(qi)件(jian)(jian)，它有較高(gao)的(de)(de)(de)(de)(de)(de)(de)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)速(su)度，但同時(shi)也有較大的(de)(de)(de)(de)(de)(de)(de)寄(ji)生(sheng)(sheng)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容。它關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)斷(duan)(duan)(duan)(duan)(duan)時(shi)，在外電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓的(de)(de)(de)(de)(de)(de)(de)作(zuo)用(yong)下(xia)， 其寄(ji)生(sheng)(sheng)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)容充(chong)滿電(dian)(dian)(dian)(dian)(dian)(dian)(dian)，如果在其開(kai)(kai)(kai)(kai)通(tong)前不(bu)將這一(yi)部分(fen)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)荷放(fang)掉，則將消(xiao)耗(hao)(hao)(hao)于(yu)器(qi)(qi)件(jian)(jian)內(nei)部，這就是(shi)(shi)容性(xing)開(kai)(kai)(kai)(kai)通(tong)損(sun)(sun)(sun)耗(hao)(hao)(hao)。為(wei)了減(jian)(jian)小(xiao)或(huo)(huo)(huo)消(xiao)除這種(zhong)損(sun)(sun)(sun)耗(hao)(hao)(hao)，功(gong)率(lv)(lv)場 效(xiao)應(ying)管(guan)宜采用(yong)零(ling)(ling)(ling)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓開(kai)(kai)(kai)(kai)通(tong)方(fang)式(shi)（ZVS）。絕(jue)緣(yuan)柵雙極性(xing)晶(jing)體管(guan)（Insulated Gate Bipolar tansistor，IGBT）是(shi)(shi)一(yi)種(zhong)復合開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)器(qi)(qi)件(jian)(jian)，關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)斷(duan)(duan)(duan)(duan)(duan)時(shi)的(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)拖 尾(wei)會導致較大的(de)(de)(de)(de)(de)(de)(de)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)斷(duan)(duan)(duan)(duan)(duan)損(sun)(sun)(sun)耗(hao)(hao)(hao)，如果在關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)斷(duan)(duan)(duan)(duan)(duan)前使(shi)流(liu)過(guo)(guo)(guo)它的(de)(de)(de)(de)(de)(de)(de)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)降(jiang)到(dao)零(ling)(ling)(ling)，則可(ke)以(yi)(yi)顯著(zhu)地(di)降(jiang)低開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)損(sun)(sun)(sun)耗(hao)(hao)(hao)，因(yin)(yin)此IGBT宜采用(yong)零(ling)(ling)(ling)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)（ZCS）關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)斷(duan)(duan)(duan)(duan)(duan)方(fang)式(shi)。IGBT在 零(ling)(ling)(ling)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓條(tiao)(tiao)件(jian)(jian)下(xia)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)斷(duan)(duan)(duan)(duan)(duan)，同樣也能減(jian)(jian)小(xiao)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)斷(duan)(duan)(duan)(duan)(duan)損(sun)(sun)(sun)耗(hao)(hao)(hao)，但是(shi)(shi)MOSFET在零(ling)(ling)(ling)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)條(tiao)(tiao)件(jian)(jian)下(xia)開(kai)(kai)(kai)(kai)通(tong)時(shi)，并(bing)不(bu)能減(jian)(jian)小(xiao)容性(xing)開(kai)(kai)(kai)(kai)通(tong)損(sun)(sun)(sun)耗(hao)(hao)(hao)。諧(xie)(xie)振轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器(qi)(qi)（ResonantConverter ，RC）、準(zhun)諧(xie)(xie)振轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器(qi)(qi)（Qunsi-Tesonant Converter，QRC）、多諧(xie)(xie)振轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器(qi)(qi)（Multi-ResonantConverter，MRC）、零(ling)(ling)(ling)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)PWM轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器(qi)(qi)（ZVS PWM Converter）、零(ling)(ling)(ling)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)PWM轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器(qi)(qi)（ZCS PWM Converter）、零(ling)(ling)(ling)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)壓轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)（Zero-Voltage-Transition，ZVT）PWM轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器(qi)(qi)和(he)(he)零(ling)(ling)(ling)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)流(liu)轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)（Zero- Voltage-Transition，ZVT）PWM轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器(qi)(qi)等，均屬于(yu)軟(ruan)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)直流(liu)轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器(qi)(qi)。電(dian)(dian)(dian)(dian)(dian)(dian)(dian)力電(dian)(dian)(dian)(dian)(dian)(dian)(dian)子開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)器(qi)(qi)件(jian)(jian)和(he)(he)零(ling)(ling)(ling)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)轉(zhuan)(zhuan)(zhuan)換(huan)(huan)(huan)器(qi)(qi)技術的(de)(de)(de)(de)(de)(de)(de)發(fa)展，促使(shi)了高(gao)頻(pin)開(kai)(kai)(kai)(kai)關(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)(guan)電(dian)(dian)(dian)(dian)(dian)(dian)(dian)源的(de)(de)(de)(de)(de)(de)(de)發(fa)展。