闂�(gu膩n)閸靛瓧锛氶枊闂�(gu膩n)闆绘簮 EMI 婵炬尝鍣� 閬�(y霉n)绠楁斁澶у櫒 缍�(w菐ng)绲�(lu貌)鍙冩暩(sh霉)

1 寮曡█

      鍌崇当(t菕ng)鐨勯枊闂�(gu膩n)闆绘簮澶у浣跨敤鐢卞垎绔嬬殑鍏辨ā闆绘劅銆佸樊妯￠浕鎰熷拰X锛孻闆诲绛夋(g貌u)鎴愬柈绱�(j铆)鎴栧绱�(j铆)鐨勭劇婧愭烤娉㈠櫒锛岄€欎簺婵炬尝鍣ㄧ劇涓€渚嬪鍦板潎鎳�(y墨ng)鐢ㄤ簡杓冨鐨勭劇婧愬厓浠�锛屽婵炬尝闆绘劅鍜岄浕瀹�銆傝€屼笖鐢变簬鍦嬮殯涓婂皪(du矛)闆荤鍏煎鐨勬(bi膩o)婧�(zh菙n)瓒婁締瓒婂毚(y谩n)鏍硷紝瑷卞鏅�(sh铆)鍊欎竴绱�(j铆)婵炬尝鍣ㄤ笉鑳芥豢瓒抽浕纾佸吋瀹圭殑瑕佹眰锛岃€屽繀闋堜娇鐢ㄥ叐绱�(j铆)鎴栬€呭绱�(j铆)锛岄€欏氨澧炲ぇ浜嗙劇婧愭烤娉㈠櫒鐨勯珨绌嶏紝寰炶€屼篃澧炲ぇ浜嗘悕鑰椼€傛澶�锛岀敱浜庣劇婧愮祫浠剁殑鍒嗗竷闆诲鍜屽紩绶氶浕鎰熺瓑鍒嗗竷鍙冩暩(sh霉)锛堝宸�銆佸叡妯￠浕鎰熺殑绻炵祫鍒嗗竷闆诲鍜屾烤娉㈤浕瀹圭殑涓茶伅(li谩n)绛夋晥闆绘劅绛夛級灏�(du矛)婵炬尝鏁堟灉褰遍熆閮藉緢澶�锛岀壒鍒ユ槸鍦ㄩ珮闋诲崁(q奴)鍩熸锛岄€欎簺鍒嗗竷鍙冩暩(sh霉)鐨勫奖闊挎渻(hu矛)鏇村姞鍤�(y谩n)閲�锛屼笖闆ｄ互鎺у埗锛屽緸鑰屽ぇ澶ц“娓涗簡楂橀牷婵炬尝鐗规€�銆備綔鐐哄叡妯″拰宸ā婵炬尝闆绘劅鐨勪富瑕佸厓浠垛€斺€旂鑺�锛屽叾闆荤鍙冩暩(sh霉)鍏锋湁闋昏畩鐗规€�锛屽苟涓旂鑺湰韬殑鎬ц兘涔熷彈鍒板伐钘濇按骞冲強鍒朵綔鏉愭枡鐨勯檺鍒�锛岄€欑郸瀹冪殑鎳�(y墨ng)鐢ㄥ付渚嗕簡璜稿闄愬埗銆傚洜姝わ紝濡備綍鍦ㄦ彁楂橀枊闂�(gu膩n)闆绘簮鐨勫姛鐜囧瘑搴﹀拰闁嬮棞(gu膩n)闋荤巼锛屽(sh铆)鐝�(xi脿n)闁嬮棞(gu膩n)闆绘簮妯″鍖栧拰闆嗘垚鍖栫殑鍚屾檪(sh铆)锛岃В姹虹敱姝ゅ紩璧风殑鏇村姞鍤�(y谩n)閲嶇殑闆荤骞叉摼鍓囨槸闆诲姏闆诲瓙鎶€琛�(sh霉)鐮旂櫦(f膩)浜哄摗闈㈣嚚鐨勯棞(gu膩n)閸靛晱椤屻€�

      绺介珨鐪�锛屽偝绲�(t菕ng)鐨勭劇婧怑MI婵炬尝鍣ㄥ瓨鍦ㄤ笅杩颁笉瓒筹細鈶犻珨绌嶅ぇ锛岄€犲児(ji脿)楂�锛屽洜姝や笉鑳芥豢瓒抽枊闂�(gu膩n)闆绘簮鏃ョ泭灏忓瀷鍖�銆侀珮瀵嗗害鍖栫殑闇€瑕�锛涒憽鐒℃簮婵炬尝鍣ㄧ殑琛版笡闋诲付杓冪獎锛屽湪浣庨牷娈佃闈犲澶ч浕鎰熷拰闆诲鍊间締鎻愰珮鍏舵彃鍏ユ悕鑰�锛岃€屽湪楂橀牷娈电敱浜庡垎甯冨弮鏁�(sh霉)鐨勫奖闊挎湁鍙兘寮曡捣涓嶅繀瑕佺殑鎸暕鑰屽奖闊垮埌婵炬尝鐗规€�锛涒憿鐣�(d膩ng)浠婅姹傞枊闂�(gu膩n)闆绘簮鎴愮偤楂旂⿳灏�锛岄噸閲忚紩锛屾晥鐜囬珮锛屽彲闈犳€ч珮锛屽姛鐜囧瘑搴﹂珮鐨勨€滅稜鑹查浕婧愨€�锛屼絾鐢变簬浣滅偤闁嬮棞(gu膩n)闆绘簮閲嶈绲勬垚閮ㄥ垎鐨勬烤娉㈠櫒锛岄珨绌嶇殑娓涘皬鏄湁闄愬害鐨�锛屽洜姝ゅ埗绱勪簡闁嬮棞(gu膩n)闆绘簮鐨勭櫦(f膩)灞�銆�

      鐒℃簮婵炬尝鍣ㄧ殑涓婅堪缂洪粸(di菐n)娉ㄥ畾瀹冨湪闆荤姹℃煋鏃ョ泭鍤�(y谩n)閲嶇殑浠婂ぉ涓嶈兘婊胯冻婵炬尝鎶€琛�(sh霉)鐨勯渶瑕�銆傝€屾湁婧怑MI婵炬尝鍣�锛岄噰鐢ㄤ簡鏈夋簮娑堝幓鎶€琛�(sh霉)锛屽緢濂藉湴鎶戝埗浜咵MI鍣伈闆绘祦锛屽苟鍙皪(du矛)瀹冮€�(j矛n)琛屽嫊(d貌ng)鎱�(t脿i)瑁�(b菙)鍎熷拰瑾�(di脿o)鏁达紝涓斾笉鏈�(hu矛)灏�(du矛)绯荤当(t菕ng)鐨勭┅(w臎n)瀹氭€ч€犳垚涓嶅埄褰遍熆锛涙澶栵紝鑸囩劇婧愭烤娉㈠櫒鐩告瘮锛岀敱浜庢湁婧怑MI婵炬尝鍣ㄩ噰鐢ㄤ簡鍗婂皫(d菐o)楂斿櫒浠跺拰闆诲瓙闆昏矾锛屽洜鑰屽彲浣块珨绌嶈畩灏�锛岄噸閲忚畩杓�锛岄€欐湁鍒╀簬闆嗘垚灏佽锛屾墍浠ュ凡鎴愮偤妤�(y猫)鐣屽皪(du矛)鍏堕€�(j矛n)琛岀爺绌剁殑涓€绋柊瓒ㄥ嫝(sh矛)鍜岀櫦(f膩)灞曟柟鍚慬1-4]銆�

2銆侀枊闂�(gu膩n)闆绘簮鏈夋簮鍏辨āEMI婵炬尝鍣�

      2.1鏈夋簮鍏辨āEMI婵炬尝鍣ㄥ熀鏈師鐞�

      鏈夋簮EMI婵炬尝鎶€琛�(sh霉)鐨勫(sh铆)璩�(zh矛)鏄皪(du矛)鍣伈淇¤櫉(h脿o)閫�(j矛n)琛屽(sh铆)鏅�(sh铆)瑁�(b菙)鍎熴€傞€欓噷鎻愬嚭鐨勬湁婧愬叡妯MI婵炬尝鍣紙Active Common-mode Filter锛岀啊绋盇CMF锛夊熀鏈師鐞嗘槸鍏堥噰妯ｅ叡妯′俊铏�(h脿o)锛岀劧鍚庨€氶亷鍙嶉锛屽嫊(d貌ng)鎱�(t脿i)杓稿嚭涓€鍊�(g猫)鑸囨墍閲囨ǎ鐨勫櫔鑱查浕娴侊紙闆诲锛夊ぇ灏忕浉绛�銆佹柟鍚戠浉鍙嶇殑瑁�(b菙)鍎熼浕娴侊紙闆诲锛�锛屽叾瀵�(sh铆)璩�(zh矛)鏄偤鍏辨ā闆绘祦鎻愪緵涓€鍊�(g猫)妤典綆闃绘姉鐨勫収(n猫i)閮ㄥ洖璺€傚湒1绀哄嚭鍏跺師鐞嗗湒銆傚叾涓�锛孭ath1鎸囧叡妯″櫔鑱叉簮S1閫氶亷鍒嗗竷闆诲CD娴佸叆鍦扮殑鍏辨ā闆绘祦璺緫锛屽湪鐒℃烤娉㈠櫒鏅�(sh铆)鍏辨ā鍣伈inoise灏囬€氶亷CP鍏ㄩ儴娉ㄥ叆鍦�銆侫CMF灏囩敘(ch菐n)鐢熶竴鍊�(g猫)瑁�(b菙)鍎熼浕娴�锛岀偤inoise鎻愪緵浣庨樆鎶楀垎娴佹敮璺疨ath2锛屽緸鑰屼娇鍏剁洝閲忔部Path2璺緫娴侀亷銆傜悊鎯虫檪(sh铆)icomp=-inoise锛屽彲浣挎祦鍏ュ湴鐨勫叡妯￠浕娴佺偤闆�锛屽緸鑰岄仈(d谩)鍒拌“娓涘叡妯￠浕娴佺殑鐩殑锛屼互婊胯冻闆荤骞叉摼鐨勬(bi膩o)婧�(zh菙n)銆�

      2.2 ACMF瑷�(sh猫)瑷�(j矛)

      鍒嗘瀽浜嗗偝绲�(t菕ng)鐒℃簮闆荤骞叉摼锛圗lectromagnetic Interference锛岀啊绋盓Ml锛夋烤娉㈠櫒鐨勭己榛�(di菐n)锛屾彁鍑烘湁婧愬叡妯℃烤娉㈠櫒鐨勮ō(sh猫)瑷�(j矛)鎬濇兂锛屽苟鍒嗘瀽浜嗗叾宸ヤ綔鍘熺悊銆備互涓€鑷�(t谩i)鍙嶆縺寮忛枊闂�(gu膩n)闆绘簮鐐哄皪(du矛)璞★紝鐮旂┒涓婅堪闁嬮棞(gu膩n)闆绘簮ACMF鐨勮ō(sh猫)瑷�(j矛)鑸囨噳(y墨ng)鐢�銆傚湒2a绀哄嚭ACMF鍦ㄩ枊闂�(gu膩n)闆绘簮绯荤当(t菕ng)涓殑閫ｆ帴銆傚湒涓�锛岀敤铏涚窔閫ｆ帴浜庡弽婵€寮忛浕婧愯畩澹撳櫒鍒濇绱�(j铆)鍦颁箣闁撶殑鍏辨ā婵炬尝闆诲Cy鍏锋湁杓冨ソ婵炬尝鏁堟灉锛屼絾鍥犲彈婕忛浕娴佸畨瑕�(gu墨)瑕佹眰鐨勯檺鍒�锛屽叾鍊间笉鑳藉お澶�銆傚湪姝ゆ摤鐢ㄦ彁鍑虹殑ACMF鍙栦唬Cy锛屼互澧炲挤(qi谩ng)灏�(du矛)鍏辨ā骞叉摼鐨勬烤娉㈡晥鏋�銆傚湒2b绀哄嚭ACMF鐨勫叿楂旈浕璺€傚畠鐢变竴鍊�(g猫)瀵付楂橀€熼亱(y霉n)绠楁斁澶у櫒U鐐烘牳蹇冪殑鍣ㄤ欢妲�(g貌u)鎴�銆�

      鐢变簬ACMF缍�(w菐ng)绲�(lu貌)铏曠悊鍏辨ā骞叉摼淇¤櫉(h脿o)鐨勭壒娈婃€�锛屾墍浠ュ皪(du矛)闆昏矾涓竴浜涘厓鍣ㄤ欢鐨勯伕鎿囦篃瀛樺湪涓€浜涚壒娈婅姹�銆侫CMF闆昏矾涓棞(gu膩n)閸靛厓鍣ㄤ欢鐨勯伕鍙栧拰瑷�(sh猫)瑷�(j矛)濡備笅锛�

锛�1锛夐亱(y霉n)绠楁斁澶у櫒U鐨勯伕鎿囧洜?y脿n)妤ｆ潗锛樿摯_鐨勯牷璀滆寖鍦嶈純瀵紝鎵€浠ヨ姹傝檿鐞嗗畠鐨勯亱(y霉n)绠楁斁澶у櫒鐨勯牷甯跺锛岄熆鎳�(y墨ng)閫熷害蹇�锛屽皪(du矛)杓稿叆闆诲涓殑鍏辨ā闆诲鏈夎純楂樼殑鎶戝埗锛屽苟鑳借几鍑鸿純澶х殑闆绘祦銆傞€欓噷閬告搰鍠綅澧炵泭鍙仈(d谩) 200MHz锛岃几鍑洪浕娴佺偤l00mA鐨勯珮閫熼浕澹撳弽楗嬪紡閬�(y霉n)鏀綥M7171锛屽畠鐨勫伐浣滈浕澹撹純瀵�锛岀偤5.5-36V銆傞€氬父鎯呮硜涓�锛岄枊闂�(gu膩n)闆绘簮鐨勯珮闋昏畩澹撳櫒閮芥渻(hu矛)鏈変竴鍊�(g猫)杓斿姪绻炵祫绲WM/PFM鎺у埗鑺墖鎻愪緵闆绘簮锛岄€欐ǎ閬�(y霉n)绠楁斁澶у櫒鐨勫伐浣滈浕澹撳彲鐩存帴寰炶┎杓斿姪绻炵祫缍�(j墨ng)鏁存祦鍚庣嵅寰楋紝濡傚湒2a涓殑#1锛屾帴鑷崇篂绲勫悗锛屽氨鍦�#1鑸�#2涔嬮枔寰堟柟渚垮湴绲﹂亱(y霉n)绠楁斁澶у櫒鎻愪緵宸ヤ綔闆绘簮銆�

锛�2锛夎矤(f霉)鍙嶉缍�(w菐ng)绲�(lu貌)鍙冩暩(sh霉)鐨勭⒑瀹氱敱浜嶢CMF缍�(w菐ng)绲�(lu貌)閲囩敤闆诲妾㈡脯(c猫)銆侀浕娴佽(b菙)鍎�锛屽彲瀵嚭ACMF鐨勫鐩夾iv鐐猴細

瑷�(sh猫)#2锛�#3涔嬮枔鐨勯樆鎶楃偤Z锛屽墖锛�

鐐轰究浜庡垎鏋�锛岃ō(sh猫)

鍓嘮鍙€�(j矛n)涓€姝ヨ〃绀虹偤锛�

      鑻ヨ兘浣縕=0锛屽墖UAB=0锛屽緸鑰屽(sh铆)鐝�(xi脿n)浜嗗湒2涓弽婵€寮忛浕璺垵娆＄礆(j铆)鍦癆銆丅鍏╅粸(di菐n)闁撶悊璜栦笂鐨勭煭璺�锛屾鏅�(sh铆)鐐烘渶鐞嗘兂鐨勬儏娉�銆傜敱寮忥紙3锛夊彲鐭�锛岃瀵�(sh铆)鐝�(xi脿n)鐞嗘兂鎯呮硜锛屽氨瑕佹眰鍙嶉缍�(w菐ng)绲�(lu貌)鐨勫鐩婄洝鍙兘澶э紝澧炵泭瓒婂ぇ锛孼瓒婂皬锛岃(b菙)鍎熸晥鏋滆秺濂�锛涗絾鍚屾檪(sh铆)鍦ㄥ(sh铆)闅涢亱(y霉n)鐢ㄤ腑锛屽緸绯荤当(t菕ng)鐨勭┅(w臎n)瀹氭€у嚭鐧�(f膩)锛岀偤閬垮厤鎸暕锛岀壒鍒ユ槸楂橀牷鎯呮硜涓嬬殑鐠�(hu谩n)璺鐩婁笉鍙兘澶ぇ锛屾墍浠ュ線寰€鏄湪绌�(w臎n)瀹氭€у拰澧炵泭闁撴姌琛烽伕鎿囥€傝│椹�(y脿n)涓�锛屽弽楗嬬恫(w菐ng)绲�(lu貌)鍙朢f=470k惟锛� R4=10惟銆�

锛�3锛夐浕瀹圭殑閬告搰杓稿嚭鑰﹀悎闆诲C6鎶婅几鍑洪浕澹撹€﹀悎鍒伴浕璺腑锛屽悓鏅�(sh铆)涔熻捣鍒癆CMF鑸囦富闆昏矾闁撶殑闅旈洟浣滅敤銆傞€欓噷锛孋6閬稿彇楂橀牷鐗规€уソ鐨勯珮闋婚浕瀹�銆�

銆€銆€鍦ˋCMF缍�(w菐ng)绲�(lu貌)涓紝鐢变簬閬�(y霉n)绠楁斁澶у櫒宸ヤ綔鏅�(sh铆)鍙嶇浉绔垏鍚岀浉绔箣闁撶殑鈥滆櫅鐭€�锛孋4鍜岃畩澹撳櫒鍒濇绱�(j铆)涔嬮枔鐨勮€﹀悎闆诲Cps涓茶伅(li谩n)锛屾晠鍙€氶亷C4閲囨ǎ鍒板叡妯￠浕澹�锛屽苟杓稿叆鑷抽亱(y霉n)绠楁斁澶у櫒鐨勫弽鐩哥锛屽啀缍�(j墨ng)閬庣敱Rf,R4,C4绲勬垚鐨勯亱(y霉n)绠楁斁澶у櫒鍙嶉缍�(w菐ng)绲�(lu貌)浠ュ強C6鍜孯5锛�锛屽嵆鍙几鍑轰竴鍊�(g猫)鍙嶆柟鍚戠殑鍕�(d貌ng)鎱�(t脿i)瑁�(b菙)鍎熼浕娴�锛屽緸鑰屼娇鍏辨ā闆绘祦鍦� ACMF缍�(w菐ng)绲�(lu貌)鍏�(n猫i)閮ㄥ惊鐠�(hu谩n)锛岄€欏ぇ澶ф笡灏戜簡娴佸叆鍦扮殑鍏辨ā闆绘祦锛岄仈(d谩)鍒颁簡琛版笡锛岀敋鑷虫秷鍘诲叡妯￠浕娴佺殑鐩殑銆�

銆€銆€鐢变簬ACMF璺ㄦ帴鍦ㄨ畩澹撳櫒鐨勫垵娆＄礆(j铆)涔嬮枔锛屼笖瀹冧唬鏇跨殑Cy涓€绔渶鎺ュ湴锛屾晠瑷�(sh猫)瑷�(j矛)鐨凙CMF闆昏矾蹇呴爤婊胯冻璁婂鍣ㄥ垵娆＄礆(j铆)闅旈洟瑕佹眰鍙婂皪(du矛)鍦版紡闆绘祦鐨勫畨瑕�(gu墨)瑕佹眰銆�

銆€銆€涓婅堪鍏╅粸(di菐n)鍦ㄩ浕璺ō(sh猫)瑷�(j矛)涓彲閫氶亷涓嬭堪鎺柦浜堜互淇濊瓑銆�

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3銆佺祼(ji茅)璜�
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