銆�銆�Power MOSFET 闈滄厠(t脿i)鐗规�т富瑕佹寚杓稿嚭鐗规�у拰杞�(zhu菐n)绉荤壒鎬�, 鑸囬潨鎱�(t脿i)鐗规�у皪(du矛)鎳�(y墨ng)鐨勪富 瑕佸弮鏁�(sh霉)鏈夋紡妤垫搳绌块浕澹�,婕忔サ椤嶅畾闆诲,婕忔サ椤嶅畾闆绘祦鍜屾煹妤甸枊(k膩i)鍟熼浕澹撶瓑.
銆�銆�1, 闈滄厠(t脿i)鐗规��
銆�銆�(1) 杓稿嚭鐗规�� 杓稿嚭鐗规�у嵆鏄紡妤电殑浼忓畨鐗规��.鐗规�ф洸绶�,濡傚湒 2(b)鎵�绀�.鐢卞湒鎵�瑕�(ji脿n),杓稿嚭 鐗规�у垎鐐烘埅姝�,椋藉拰鑸囬潪椋藉拰 3 鍊�(g猫)鍗�(q奴)鍩�.閫欓噷椋藉拰,闈為＝鍜岀殑姒傚康鑸� GTR 涓嶅悓. 椋藉拰鏄寚婕忔サ闆绘祦 ID 涓嶉毃婕忔簮闆诲 UDS 鐨勫鍔犺�屽鍔�,涔熷氨鏄熀鏈繚鎸佷笉璁�;闈� 椋藉拰鏄寚鍦� UCS 涓�瀹氭檪(sh铆),ID 闅� UDS 澧炲姞鍛堢窔鎬ч棞(gu膩n)绯昏畩鍖�.
銆�銆�(2) 杞�(zhu菐n)绉荤壒鎬� 杞�(zhu菐n)绉荤壒鎬ц〃绀烘紡妤甸浕娴� ID 鑸囨煹婧愪箣闁撻浕澹� UGS 鐨勮綁(zhu菐n)绉荤壒鎬ч棞(gu膩n)绯绘洸绶�, 濡傚湒 2(a) 鎵�绀�. 杞�(zhu菐n)绉荤壒鎬у彲琛ㄧず鍑哄櫒浠剁殑鏀惧ぇ鑳藉姏, 骞朵笖鏄垏 GTR 涓殑闆绘祦澧炵泭 尾 鐩镐技. 鐢变簬 Power MOSFET 鏄鎺у櫒浠�,鍥犳鐢ㄨ法灏�(d菐o)閫欎竴鍙冩暩(sh霉)渚�(l谩i)琛ㄧず.璺ㄥ皫(d菐o)瀹氱京鐐� (1) 鍦栦腑 UT 鐐洪枊(k膩i)鍟熼浕澹�,鍙湁鐣�(d膩ng) UGS=UT 鏅�(sh铆)鎵嶆渻(hu矛)鍑虹従(xi脿n)灏�(d菐o)闆绘簼閬�,鐢�(ch菐n)鐢熸紡妤甸浕娴� ID
銆�銆�2, 鍕�(d貌ng)鎱�(t脿i)鐗规��
銆�銆�鍕�(d貌ng)鎱�(t脿i)鐗规�т富瑕佹弿杩拌几鍏ラ噺鑸囪几鍑洪噺涔嬮枔鐨勬檪(sh铆)闁撻棞(gu膩n)绯�,瀹冨奖闊垮櫒浠剁殑闁�(k膩i)闂�(gu膩n)閬�(gu貌)绋�.鐢变簬瑭插櫒浠剁偤鍠サ鍨�,闈犲鏁�(sh霉)杓夋祦瀛愬皫(d菐o) 闆�,鍥犳闁�(k膩i)闂�(gu膩n)閫熷害蹇�,鏅�(sh铆)闁撶煭,涓�鑸湪绱嶇鏁�(sh霉)閲忕礆(j铆).
銆�銆�Power MOSFET 鐨勫嫊(d貌ng)鎱�(t脿i)鐗规��.濡傚湒鎵�绀�.
銆�銆�Power MOSFET 鐨勫嫊(d貌ng)鎱�(t脿i)鐗规�х敤鍦� 3(a)闆昏矾娓�(c猫)瑭�.鍦栦腑,up 鐐虹煩褰㈣剤娌栭浕澹撲俊 铏�(h脿o)婧�;RS 鐐轰俊铏�(h脿o)婧愬収(n猫i)闃�;RG 鐐烘煹妤甸浕闃�;RL 鐐烘紡妤佃矤(f霉)杓夐浕闃�;RF 鐢ㄤ互妾㈡脯(c猫)婕忔サ 闆绘祦. Power MOSFET 鐨勯枊(k膩i)闂�(gu膩n)閬�(gu貌)绋嬫尝褰�,濡傚湒 3(b)鎵�绀�. Power MOSFET 鐨勯枊(k膩i)閫氶亷(gu貌)绋�:鐢变簬 Power MOSFET 鏈夎几鍏ラ浕瀹�,鍥犳鐣�(d膩ng)鑴� 娌栭浕澹� up 鐨勪笂鍗囨部鍒颁締(l谩i)鏅�(sh铆),杓稿叆闆诲鏈変竴鍊�(g猫)鍏呴浕閬�(gu貌)绋�,鏌垫サ闆诲 uGS 鎸夋寚鏁�(sh霉)鏇茬窔 涓婂崌.鐣�(d膩ng) uGS 涓婂崌鍒伴枊(k膩i)鍟熼浕澹� UT 鏅�(sh铆),闁�(k膩i)濮嬪舰鎴愬皫(d菐o)闆绘簼閬撳苟鍑虹従(xi脿n)婕忔サ闆绘祦 iD.寰� up 鍓嶆部鏅�(sh铆)鍒诲埌 uGS=UT,涓旈枊(k膩i)濮嬪嚭鐝�(xi脿n) iD 鐨勬檪(sh铆)鍒�,閫欐鏅�(sh铆)闁撶ū(ch膿ng)鐐洪枊(k膩i)閫氬欢鏅�(sh铆)鏅�(sh铆)闁� td(on).姝� 鍚�,iD 闅� uGS 鐨勪笂鍗囪�屼笂鍗�,uGS 寰為枊(k膩i)鍟熼浕澹� UT 涓婂崌鍒� Power MOSFET 鑷ㄨ繎椋藉拰鍗�(q奴) 鐨勬煹妤甸浕澹� uGSP 閫欐鏅�(sh铆)闁�,绋�(ch膿ng)鐐轰笂鍗囨檪(sh铆)闁� tr.閫欐ǎ Power MOSFET 鐨勯枊(k膩i)閫氭檪(sh铆)闁�
銆�銆�ton=td(on)+tr(2)
銆�銆�Power MOSFET 鐨勯棞(gu膩n)鏂烽亷(gu貌)绋�:鐣�(d膩ng) up 淇¤櫉(h脿o)闆诲涓嬮檷鍒� 0 鏅�(sh铆),鏌垫サ杓稿叆闆诲涓婂劜(ch菙) 瀛樼殑闆昏嵎閫氶亷(gu貌)闆婚樆 RS 鍜� RG 鏀鹃浕,浣挎煹妤甸浕澹撴寜鎸囨暩(sh霉)鏇茬窔涓嬮檷,鐣�(d膩ng)涓嬮檷鍒� uGSP 绻� 绾�(x霉)涓嬮檷,iD 鎵嶉枊(k膩i)濮嬫笡灏�,閫欐鏅�(sh铆)闁撶ū(ch膿ng)鐐洪棞(gu膩n)鏂峰欢鏅�(sh铆)鏅�(sh铆)闁� td(off).姝ゅ悗,杓稿叆闆诲绻肩簩(x霉) 鏀鹃浕,uGS 绻肩簩(x霉)涓嬮檷,iD 涔熺辜绾�(x霉)涓嬮檷,鍒� uGS<U< SPAN>T 鏅�(sh铆)灏�(d菐o)闆绘簼閬撴秷澶�,iD=0, 閫欐鏅�(sh铆)闁撶ū(ch膿ng)鐐轰笅闄嶆檪(sh铆)闁� tf.閫欐ǎ Power MOSFET 鐨勯棞(gu膩n)鏂锋檪(sh铆)闁�
銆�銆�toff=td(off)+tf (3)
銆�銆�寰炰笂杩板垎鏋愬彲鐭�,瑕佹彁楂樺櫒浠剁殑闁�(k膩i)闂�(gu膩n)閫熷害,鍓囧繀闋堟笡灏忛枊(k膩i)闂�(gu膩n)鏅�(sh铆)闁�.鍦ㄨ几鍏ラ浕 瀹逛竴瀹氱殑鎯呮硜涓�,鍙互閫氶亷(gu貌)闄嶄綆椹�(q奴)鍕�(d貌ng)闆昏矾鐨勫収(n猫i)闃� RS 渚�(l谩i)鍔犲揩闁�(k膩i)闂�(gu膩n)閫熷害. 闆诲姏鍫�(ch菐ng)鏁堟噳(y墨ng)绠℃櫠楂旂鏄鎺у櫒浠�,鍦ㄩ潨鎱�(t脿i)鏅�(sh铆)骞句箮涓嶈几鍏ラ浕娴�.浣嗗湪闁�(k膩i)闂�(gu膩n)閬�(gu貌)绋� 涓�,闇�瑕佸皪(du矛)杓稿叆闆诲閫�(j矛n)琛屽厖鏀鹃浕,鏁呬粛闇�瑕佷竴瀹氱殑椹�(q奴)鍕�(d貌ng)鍔熺巼.宸ヤ綔閫熷害瓒婂揩,闇� 瑕佺殑椹�(q奴)鍕�(d貌ng)鍔熺巼瓒婂ぇ.
