銆�銆�闅ㄨ憲鍙嶅悜闆诲�撶殑鎻愰珮锛岀┖闁撻浕鑽峰崁(q奴)鍏�(n猫i)闆诲牬(ch菐ng)澧炲挤(qi谩ng)锛岄�氶亷(gu貌)鍕�(sh矛)澹樺崁(q奴)鐨勮級娴佸瓙鐛插緱鐨勮兘閲忎篃闅ㄤ箣澧炲姞銆傜暥(d膩ng)鍙嶅悜闆诲�撴帴杩戞搳绌块浕澹揢B鏅�(sh铆)锛岄�欎簺鏈夎純楂樿兘閲忕殑杓夋祦瀛愯垏绌洪枔闆昏嵎鍗�(q奴)鍏�(n猫i)鐨勪腑鎬у師瀛愮浉閬囩櫦(f膩)鐢熺�版挒闆婚��锛岀敘(ch菐n)鐢熸柊鐨勯浕瀛�-绌虹┐灏�(du矛)銆傞�欎簺鏂扮敘(ch菐n)鐢熺殑闆诲瓙鍜岀┖绌村張鏈�(hu矛)鍦ㄩ浕鍫�(ch菐ng)鐨勪綔鐢ㄤ笅锛岄噸鏂扮嵅寰楄兘閲忥紝纰版挒鍏跺畠鐨勪腑鎬у師瀛愪娇涔嬮浕闆�锛屽啀鐢�(ch菐n)鐢熸洿澶氱殑闆诲瓙-绌虹┐灏�(du矛)銆傞�欑ó閫ｉ帠鍙嶆噳(y墨ng)绻肩簩(x霉)涓嬪幓锛屼娇绌洪枔闆昏嵎鍗�(q奴)鍏�(n猫i)鐨勮級娴佸瓙鏁�(sh霉)閲忓妵澧烇紝灏卞儚闆�宕╀竴妯�锛屼娇鍙嶅悜闆绘祦鎬ュ妵澧炲ぇ锛岀敘(ch菐n)鐢熸搳绌�銆傛墍浠ユ妸閫欑ó鎿婄┛绋辩偤闆�宕╂搳绌�銆�

銆�銆�闆�宕╂搳绌夸竴鑸�鐧�(f膩)鐢熷湪鎽婚洔婵冨害杓冧綆銆佸�栧姞闆诲�撳張杓冮珮鐨凱N绲�(ji茅)涓�銆傞�欐槸鍥�?y脿n)闁捐�玸婵冨害杓冧綆鐨凱N绲�(ji茅)锛岀┖闁撻浕鑽峰崁(q奴)瀵�搴﹁純瀵�锛岀櫦(f膩)鐢熺�版挒闆婚洟鐨勬��(j墨)鏈�(hu矛)杓冨��銆�

銆�銆�鐣�(d膩ng) MOSFET 婕忔サ瀛樺湪澶ч浕娴� Id,楂橀浕澹� Vd 鏅�(sh铆),鍣ㄤ欢鍏�(n猫i)闆婚洟浣滅敤鍔犲妵,鍑虹従(xi脿n)澶ч噺鐨勭┖绌撮浕娴�,缍�(j墨ng) Rb 娴佸叆婧愭サ,灏�(d菐o)鑷村瘎鐢熶笁妤电�� 鍩烘サ闆诲嫝(sh矛) Vb 鍗囬珮,鍑虹従(xi脿n)鎵�璎傜殑"蹇�鍥�(Snap-back)"鐝�(xi脿n)璞�,鍗冲湪 Vb 鍗囬珮鍒颁竴瀹氱▼搴� 鏅�(sh铆),瀵勭敓涓夋サ绠� V2 灏�(d菐o)閫�,闆嗛浕妤�(鍗虫紡妤�)闆诲�撳揩閫熻繑鍥為仈(d谩)鍒版櫠楂旂�″熀妤甸枊璺�鏅�(sh铆)鐨� 鎿婄┛闆诲��(澧炵泭寰堥珮鐨勬櫠楂旂�′腑瑭插�肩浉灏�(du矛)杓冧綆),寰炶�岀櫦(f膩)鐢熼洩宕╂搳绌�,(澶ч噺鐨勭爺绌� 鍜岃│椹�(y脿n)琛ㄦ槑,Ic,SB 寰堝皬.鍙﹀��,鐢变簬瀵勭敓涓夋サ绠＄殑澧炵泭杓冨ぇ,鏁呭湪闆�宕╂搳绌挎��(sh铆), 涓夋サ绠″熀妤甸浕瀛�,绌虹┐閲嶆柊绲�(ji茅)鍚堟墍褰㈡垚鐨勯浕娴�,浠ュ強寰炰笁妤电�￠泦闆绘サ鍒扮��(f膩)灏勬サ绌虹┐ 绉诲嫊(d貌ng)鎵�褰㈡垚鐨勯浕娴�,鍙�鍗犱�� MOSFET 婕忔サ闆绘祦鐨勪竴灏忛儴鍒�;鎵�鏈夌殑鍩烘サ闆绘祦 Ib 娴侀亷(gu貌) Rb;鐣�(d膩ng) Ib 浣垮熀妤甸浕浣嶅崌楂樺埌涓�瀹氱▼搴︽檪(sh铆),瀵勭敓鏅堕珨绠￠��(j矛n)鍏ュ皫(d菐o)閫氱媭鎱�(t脿i),MOSFET 婕忔簮 妤甸浕澹撹繀閫熶笅闄�,鐧�(f膩)鐢熼洩宕╂搳绌挎晠闅�.

銆�銆�闆欐サ鎬у櫒浠跺湪鐧�(f膩)鐢熶簩娆℃搳绌挎檪(sh铆),闆嗛浕妤甸浕 澹撴渻(hu矛)鍦ㄦ晠闅滅灛闁撳緢鐭�鏅�(sh铆)闁撳収(n猫i)(鍙�鑳藉皬浜� 1ns)琛版笡骞剧櫨浼�.閫欑ó闆诲�撻姵娓涗富瑕佹槸鐢� 闆�宕╁紡娉ㄥ叆寮曡捣鐨�,涓昏�佸師鍥犲湪浜�:浜屾�℃搳绌挎��(sh铆),鍣ㄤ欢鍏�(n猫i)閮ㄩ浕鍫�(ch菐ng)寰堝ぇ,闆绘祦瀵嗗害涔� 姣旇純澶�,鍏╃ó鍥犵礌鍚屾檪(sh铆)瀛樺湪,涓�璧峰奖闊挎�ｅ父鏅�(sh铆)鐨勮�楃洝鍗�(q奴)鍥哄畾闆昏嵎,浣胯級娴佸瓙鐧�(f膩)鐢熼洩 宕╁紡鍊嶅��. 灏�(du矛)浜庝笉鍚岀殑鍣ㄤ欢, 鐧�(f膩)鐢熼洩宕╁紡娉ㄥ叆鐨勬儏娉佹槸涓嶅悓鐨�. 灏�(du矛)浜庨洐妤垫�ф櫠楂旂��, 闄や簡闆诲牬(ch菐ng)鎳�(y墨ng)鍔涚殑鍘熷洜澶�,姝ｅ悜鍋忕疆鏅�(sh铆)鍣ㄤ欢鐨勭啽涓嶇┅(w臎n)瀹氭��,涔熸湁鍙�鑳戒娇鍏堕浕娴佸瘑搴﹂��(d谩) 鍒伴洩宕╁紡娉ㄥ叆鍊�.鑰屽皪(du矛)浜� MOSFET,鐢变簬鏄�澶氭��(sh霉)杓夋祦瀛愬櫒浠�,閫氬父瑾�(r猫n)鐐哄叾涓嶆渻(hu矛)鐧�(f膩)鐢熸�� 鍚戝亸缃�浜屾�℃搳绌�,鑰屽湪鍙嶅悜鍋忕疆鏅�(sh铆),鍙�鏈夐浕姘ｆ柟闈㈢殑鍘熷洜鑳戒娇鍏堕浕娴佸瘑搴﹂��(d谩)鍒伴洩宕� 娉ㄥ叆鍊�, 鑰岃垏鐔辨噳(y墨ng)鍔涚劇(w煤)闂�(gu膩n). 浠ヤ笅灏�(du矛)鍔熺巼 MOSFET 鐨勯洩宕╂搳绌夸綔閫�(j矛n)涓�姝ョ殑鍒嗘瀽. MOSFET 鍦� 鍏�(n猫i)閮ㄥ悇灞ら枔瀛樺湪瀵勭敓浜屾サ绠�,鏅堕珨绠�(涓夋サ绠�)鍣ㄤ欢.寰炲井瑙�瑙掑害鑰岃█,閫欎簺瀵勭敓 鍣ㄤ欢閮芥槸鍣ㄤ欢鍏�(n猫i)閮� PN 绲�(ji茅)闁撳舰鎴愮殑绛夋晥鍣ㄤ欢,瀹冨�戜腑鐨勭┖绌�,闆诲瓙鍦ㄩ珮閫熼枊闂�(gu膩n)閬�(gu貌)绋嬩腑 鍙楀悇绋�鍥犵礌鐨勫奖闊�,鏈�(hu矛)灏�(d菐o)鑷� MOSFET 鐨勫悇绋�涓嶅悓鐨勮〃鐝�(xi脿n).灏�(d菐o)閫氭檪(sh铆),姝ｅ悜闆诲�撳ぇ浜庨杸妾� 闆诲��,闆诲瓙鐢辨簮妤电稉(j墨ng)楂旇〃鍙嶈綁(zhu菐n)灞ゅ舰鎴愮殑婧濋亾閫�(j矛n)鍏ユ紡妤�,涔嬪悗鐩存帴閫�(j矛n)鍏ユ紡妤电瘈(ji茅)榛�(di菐n);婕� 妤靛瘎鐢熶簩妤电�＄殑鍙嶅悜婕忛浕娴佹��(hu矛)鍦ㄩ＝鍜屽崁(q奴)鐢�(ch菐n)鐢熶竴鍊�(g猫)灏忕殑闆绘祦鍒嗛噺.鑰屽湪绌�(w臎n)鎱�(t脿i)鏅�(sh铆),瀵勭敓 浜屾サ绠�,鏅堕珨绠＄殑褰遍熆涓嶅ぇ.闂�(gu膩n)鏂锋檪(sh铆),鐐轰娇 MOSFET 楂旇〃鍙嶈綁(zhu菐n)灞ら棞(gu膩n)鏂�,鎳�(y墨ng)鐣�(d膩ng)鍘绘帀鏌垫サ 闆诲�撴垨鍔犲弽鍚戦浕澹�.閫欐檪(sh铆),婧濋亾闆绘祦(婕忔サ闆绘祦)闁嬪�嬫笡灏�,鎰熸�ц矤(f霉)杓変娇婕忔サ闆诲�� 鍗囬珮浠ョ董鎸佹紡妤甸浕娴佹亽瀹�.婕忔サ闆诲�撳崌楂�,鍏堕浕娴佺敱婧濋亾闆绘祦鍜屼綅绉婚浕娴�(婕忔サ楂� 浜屾サ绠¤�楃洝鍗�(q奴)鐢熸垚鐨�,涓旇垏 dVDS/dt 鎴愭瘮渚�)绲勬垚.婕忔サ闆诲�撳崌楂樼殑姣旂巼鑸囧熀妤垫�� 闆讳互鍙婃紡妤佃�楃洝鍗�(q奴)鍏呴浕鐨勬瘮鐜囨湁闂�(gu膩n);鑰屽悗鑰呮槸鐢辨紡-婧愭サ闆诲��,婕忔サ闆绘祦姹哄畾鐨�. 鍦ㄥ拷鐣ュ叾瀹冨師鍥犳檪(sh铆),婕忔サ闆绘祦瓒婂ぇ闆诲�撴��(hu矛)鍗囬珮寰楄秺蹇�.濡傛灉娌�(m茅i)鏈夊�栭儴閴椾綅闆昏��,婕� 妤甸浕澹撳皣鎸佺簩(x霉)鍗囬珮,鍓囨紡妤甸珨浜屾サ绠＄敱浜庨洩宕╁�嶅�炵��(ch菐n)鐢熻級娴佸瓙,鑰岄��(j矛n)鍏ユ寔绾�(x霉)灏�(d菐o)閫氭ā 寮�(Sustaining Mode).姝ゆ檪(sh铆),鍏ㄩ儴鐨勬紡妤甸浕娴�(姝ゆ檪(sh铆)鍗抽洩宕╅浕娴�)娴侀亷(gu貌)楂斾簩妤电��, 鑰屾簼閬撻浕娴佺偤闆�.鐢变笂杩板垎鏋愬彲浠ョ湅鍑�,鍙�鑳藉紩璧烽洩宕╂搳绌跨殑涓夌ó闆绘祦鐐烘紡闆绘��, 浣嶇Щ闆绘祦(鍗� dVDS/dt 闆绘祦),闆�宕╅浕娴�,涓夎�呯悊璜栦笂閮芥渻(hu矛)婵�娲诲瘎鐢熸櫠楂旂�″��(d菐o)閫�. 瀵勭敓鏅堕珨绠″皫(d菐o)閫氫娇 MOSFET 鐢遍珮澹撳皬闆绘祦杩呴�熼亷(gu貌)娓″埌浣庡�撳ぇ闆绘祦鐙�鎱�(t脿i), 寰炶�岀櫦(f膩)鐢熼洩宕� 鎿婄┛.

銆�銆�鍦ㄩ枊闂�(gu膩n)绠￠洩宕╂搳绌块亷(gu貌)绋嬩腑, 鑳介噺闆嗕腑鍦ㄥ姛鐜� 鍣ㄤ欢鍚勮�楁暎灞ゅ拰婧濋亾涓�,鍦ㄥ瘎鐢熶笁妤电�℃縺娲诲皫(d菐o)閫氱櫦(f膩)鐢熶簩娆℃搳绌挎檪(sh铆),MOSFET 鏈�(hu矛)浼撮毃鎬� 鍔囩殑鐧�(f膩)鐔辩従(xi脿n)璞�,閫欐槸鑳介噺閲嬫斁鐨勮〃鐝�(xi脿n).浠ヤ笅灏�(du矛)闆�宕╂搳绌挎��(sh铆)鑳介噺鑰楁暎鑸囨韩鍗囩殑闂�(gu膩n)绯婚��(j矛n) 琛屽垎鏋�.闆�宕╂搳绌挎��(sh铆)鐨勮�楁暎鑳介噺鑸囨韩鍗囩殑闂�(gu膩n)绯荤偤 闆绘祦鍛堢窔鎬у�為��(zh菐ng),澧為暦(zh菐ng)鐜囩偤

銆�銆�螖胃M鈭�

銆�銆�闆�宕╂搳绌块枊濮嬫��(sh铆), di/dt=VBR/L(13)寮忎腑:VBR 鐐洪洩宕╂搳绌块浕澹�(鍋囪ō(sh猫) 鐐烘亽瀹�);L 鐐烘紡妤甸浕璺�闆绘��.鑻ユ�ゆ��(sh铆) MOSFET 鏈�鐧�(f膩)鐢熸晠闅�,鍓囧湪闂�(gu膩n)鏂锋檪(sh铆)鍒讳箣鍓�,鍏� 鍏�(n猫i)閮ㄨ�楁暎鐨勮兘閲忕偤

銆�銆�E=LIo2(14)

銆�銆�寮忎腑:E 鐐鸿�楁暎鑳介噺;Io 鐐洪棞(gu膩n)鏂峰墠鐨勬紡妤甸浕娴�. 闅ㄨ憲鑳介噺鐨勯噵鏀�,鍣ㄤ欢婧�搴︾��(f膩)鐢熻畩鍖�,鍏剁灛鏅�(sh铆)閲嬫斁鑳介噺鍊肩偤

銆�銆�P(t)=i(t)v=i(t)VBR

銆�銆�寮忎腑: i(t)=Io-t (16) 鍒颁换鎰忔檪(sh铆)鍒� t 鎵�鑰楁暎鐨勮兘閲忕偤 (17)鍦ㄤ竴瀹氭檪(sh铆)闁� t 鍚�,涓�瀹氱殑鑰楁暎鍔熺巼涓�,婧�鍗囩�� 鏂规硶琛ㄧず婧�鍗囩�� E=Pdt=L(Io2-i2) 螖胃=PoK(18)寮忎腑:K=,

銆�銆�鍏朵腑 蟻 鐐哄瘑搴�;k 鐐洪浕灏�(d菐o)鐜�;c 鐐虹啽瀹归噺.瀵�(sh铆)闅涗笂鑰楁暎鍔熺巼涓嶆槸鎭掑畾鐨�,鐢ㄧ枈鍔犵殑

銆�銆�螖胃=PoK-未PnK(19)

銆�銆�寮忎腑:Pn=未inVBR=VBR未t; Po=IoVBR; 未t=tn-tn-1;tm=t=.鍓囨韩鍗囧彲浠ヨ〃绀虹偤

銆�銆�螖胃(t)=PoK-K未t(20)

銆�銆�鍙�浠ヨ〃绀烘�� 绌嶅垎褰㈠紡鐐�

銆�銆�螖胃(t)=PoK-Kd蟿(21)

銆�銆�鍦ㄦ煇涓�鏅�(sh铆)鍒� t 婧�鍗囪〃閬�(d谩)寮忕偤

銆�銆�螖胃(t)=PoK- K(22)

銆�銆�灏囨韩鍗囪〃閬�(d谩)寮忚��(gu墨)鑼冨寲铏曠悊,寰� =(23)寮忎腑:tf=,鐐洪浕娴� i=0 鐨勬檪(sh铆)鍒�;螖胃M 鐐烘韩鍗�(t=tf/2 鏅�(sh铆)).鍓囩敱寮�(22)寰� 螖胃=PoK=IoVBRK(24)

銆�銆�鐢变笂闈㈢殑鍒嗘瀽閬�(gu貌)绋� 鍙�浠ョ湅鍑�,鍦ㄥ姛鐜� MOSFET 鐧�(f膩)鐢熼洩宕╂搳绌挎檪(sh铆),鍣ㄤ欢婧�搴﹁垏鍒濆�嬮浕娴�,浠ュ強鍣ㄤ欢鏈�韬�鐨� 鎬ц兘鏈夐棞(gu膩n).鍦ㄩ洩宕╂搳绌垮悗濡傛灉娌�(m茅i)鏈夐仼鐣�(d膩ng)?sh霉)鏈ㄥ綄_,鎶戝埗鎺�鏂�,闅ㄨ憲闆绘祦鐨勫�炲��,鍣ㄤ欢 鐧�(f膩)鏁ｅ収(n猫i)閮ㄨ兘閲忕殑鑳藉姏瓒婁締(l谩i)瓒婂樊,婧�搴︿笂鍗囧緢蹇�,寰堝彲鑳藉皣鍣ㄤ欢鐕掓瘈.鍦ㄧ従(xi脿n)浠ｅ姛鐜囧崐 灏�(d菐o)楂旀妧琛�(sh霉)涓�,MOSFET 瑷�(sh猫)瑷�(j矛),鍒堕�犵殑涓�鍊�(g猫)寰堥噸瑕佹柟闈㈠氨鏄�鍎�(y艒u)鍖栧柈鍏冪祼(ji茅)妲�(g貌u),淇冮��(j矛n)闆�宕╂�� 绌挎檪(sh铆)鐨勮兘閲忚�楁暎鑳藉姏