PWM璋冨厜甯歌鏁呴殰鍙?qiáng)瑙ｅ啗_姙娉?/p>
PWM錛堣剦鍐插搴﹁皟鍒訛級璋冨厜浣滀負(fù) LED銆佹樉紺哄睆銆佺數(shù)鏈烘帶鍒剁瓑棰嗗煙鐨勬牳蹇冭皟鍏夋妧鏈紝鍏舵晠闅滄湰璐ㄥ涓?span style="border: 0px solid; box-sizing: border-box; margin: 0px; padding: 0px; -webkit-font-smoothing: antialiased; -webkit-tap-highlight-color: ; outline: none; font-weight: 600; line-height: 26.25px; color: rgba(0, 0, 0, 0.95) !important;">淇″彿浼犺緭寮傚父銆佺‖浠跺弬鏁頒笉鍖歸厤銆佸共鎵板獎鍝?/span>鐩稿叧銆備互涓嬩粠 鈥滃父瑙佹晠闅滅幇璞♀�濃�滄牴鏈師鍥犫�濃�滈拡瀵規(guī)�цВ鍐沖姙娉曗�?涓変釜緇村害灞曞紑錛岀粨鍚堟妧鏈師鐞嗘彁渚涘彲钀藉湴鐨勬帓鏌ユ柟妗堬紝鍚屾椂琛ュ厖棰勯槻寤鴻銆?/p>
鐜拌薄錛氭棤璁哄浣曡皟鑺?PWM 淇″彿鍗犵┖姣旓紝璐熻澆錛堝 LED 鐏級濮嬬粓涓嶄寒銆佷寒搴︿笉鍙橈紝鎴栦粎淇濇寔鏈�澶?/ 鏈�灝忎寒搴︺�?br class="container-utlnW2 wrapper-d0Cc1k undefined" style="border: 0px solid; box-sizing: border-box; margin: 1em; padding: 0px; -webkit-font-smoothing: antialiased; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); outline: none; font-size: 18.75px; content: ""; display: block;"/>鏍稿績鍘熷洜錛?/p>
淇″彿閾捐礬涓柇錛圥WM 淇″彿鏈�佽揪椹卞姩鑺墖錛夛紱
椹卞姩鑺墖鎹熷潖鎴栦緵鐢?shù)寮傚父锛?/p>
璐熻澆涓庨┍鍔ㄥ弬鏁頒笉鍖歸厤錛堝 LED 棰濆畾鐢墊祦瓚呰繃椹卞姩杈撳嚭鑳藉姏錛夈�?/p>
瑙ｅ喅姝ラ錛?/p>
鎺掓煡渚涚數(shù)錛氱敤涓囩敤琛ㄦ祴閲忛┍鍔ㄨ姱鐗囩殑 VCC錛堜緵鐢電數(shù)鍘嬶級鍜?GND錛岀‘璁ょ數(shù)鍘嬬鍚堣姱鐗?datasheet 瑕佹眰錛堝 5V/12V錛夛紝鑻ョ數(shù)鍘嬩負(fù) 0 鎴栬繃浣庯紝媯�(gè)鏌ョ數(shù)婧愰�傞厤鍣ㄣ�佺數(shù)婧愮嚎鏄惁鏂礬 / 鎺ヨЕ涓嶈壇銆?/p>
媯�(gè)嫻?PWM 淇″彿錛氱敤紺烘嘗鍣紙鎴栭�昏緫鍒嗘瀽浠級鎺㈠ご鎺ラ┍鍔ㄨ姱鐗囩殑 PWM 杈撳叆寮曡剼錛岃皟鑺傝皟鍏夋棆閽?/ 淇″彿婧愶紝瑙傚療鏄惁鏈夐珮浣庣數(shù)騫寵剦鍐詫紙姝ｅ父搴旈殢璋冭妭鍙樺寲鍗犵┖姣旓紝濡?0%-100%錛夈�傝嫢鏃犱俊鍙鳳細(xì)
楠岃瘉椹卞姩涓庤礋杞藉尮閰嶆�?/span>錛?/p>
鏇存崲鏍稿績鍣ㄤ歡錛氳嫢渚涚數(shù)銆佷俊鍙峰潎姝ｅ父錛屽ぇ姒傜巼鏄┍鍔ㄨ姱鐗囷紙濡?PT4115銆丩M3409錛夋崯鍧忥紝鏇存崲鍚屽瀷鍙瘋姱鐗囧悗閲嶈瘯銆?/p>
鐜拌薄錛氳皟鑺傝繃紼嬩腑璐熻澆浜害鍛ㄦ湡鎬ф嘗鍔紝鎴栦綆浜害鏃墮棯鐑佹槑鏄撅紝楂樹寒搴︽椂緙撹В銆?br class="container-utlnW2 wrapper-d0Cc1k undefined" style="border: 0px solid; box-sizing: border-box; margin: 1em; padding: 0px; -webkit-font-smoothing: antialiased; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); outline: none; font-size: 18.75px; content: ""; display: block;"/>鏍稿績鍘熷洜錛?/p>
PWM 棰戠巼榪囦綆錛堜綆浜庝漢鐪艱瑙夋殏鐣欓槇鍊鹼紝閫氬父 < 100Hz錛夛紱
淇″彿騫叉壈錛堝鐢墊簮綰規(guī)嘗銆佸閮ㄧ數(shù)紓佸共鎵頒鏡鍏?PWM 淇″彿錛夛紱
鍗犵┖姣旇皟鑺傞潪綰挎�э紙濡備俊鍙鋒簮杈撳嚭娉㈠艦澶辯湡錛夈�?/p>
瑙ｅ喅姝ラ錛?/p>
鎻愬崌 PWM 棰戠巼錛?/p>
鑻ョ敱 MCU 鐢熸垚 PWM 淇″彿錛屼慨鏀圭▼搴忎腑瀹氭椂鍣ㄧ殑棰勫垎棰戠郴鏁板拰鑷姩閲嶈鍊鹼紙濡?STM32 鑺墖錛屽皢棰戠巼浠?50Hz 鎻愬崌鑷?200Hz 浠ヤ笂錛屼漢鐪煎熀鏈棤闂儊錛夛紱
鑻ョ敤涓撶敤璋冨厜鑺墖錛岄�氳繃鑺墖寮曡剼閰嶇疆錛堝澶栨帴鐢?shù)闃?/ 鐢?shù)瀹瑰Q夎皟鏁撮鐜囷紝鍙傝�?datasheet 涓殑 鈥滈鐜囪綆楀叕寮忊�濓紙濡傛煇浜涜姱鐗囬鐜?= f=1/(R脳C)錛夈�?/p>
鎶戝埗騫叉壈錛?/p>
鐢墊簮绔細(xì)鍦ㄩ┍鍔ㄨ姱鐗?VCC 寮曡剼騫惰仈 100nF 闄剁摲鐢?shù)瀹?+ 10渭F 鐢?shù)瑙ｇ數(shù)瀹瑰Q堟護(hù)闄ら珮棰戠汗娉㈠拰浣庨鍣０錛夛紝鑻ョ數(shù)婧愭槸寮�鍏崇數(shù)婧愶紝澧炲姞鍏辨ā鐢墊劅鍑忓皯騫叉壈錛?/p>
淇″彿绔細(xì)PWM 淇″彿綰塊噰鐢ㄥ睆钄界嚎錛堝睆钄藉眰鍗曠鎺ュ湴錛岄伩鍏嶅鐐規(guī)帴鍦頒駭鐢熺幆嫻侊級錛岃繙紱誨己鐢墊祦綰匡紙濡傜數(shù)鏈虹數(shù)婧愮嚎錛夛紝綰塊暱瓚呰繃 5 綾蟲椂鍦ㄤ俊鍙風(fēng)涓茶仈 100惟 闄愭祦鐢?shù)闃诲Q屽噺灝戝弽灝勫共鎵般�?/p>
淇娉㈠艦澶辯湡錛?/p>
鐢ㄧず娉㈠櫒瑙傚療 PWM 娉㈠艦錛岃嫢鍑虹幇涓婂崌娌?/ 涓嬮檷娌胯繃緙擄紙>1渭s錛夛紝媯�(gè)鏌ヤ俊鍙鋒簮杈撳嚭闃繪姉鏄惁榪囬珮錛堝 MCU 寮曡剼闇�澶栨帴涓婃媺鐢?shù)闃?4.7k惟錛夛紱
鑻ユ嘗褰㈡湁鏉傛嘗錛屽湪椹卞姩鑺墖 PWM 杈撳叆寮曡剼騫惰仈 1nF 鐢?shù)瀹规护鎳L錛堟敞鎰忕數(shù)瀹逛笉鑳借繃澶э紝鍚﹀垯浼?xì)邈^婊戝崰絀烘瘮錛屽鑷磋皟鍏夌簿搴︿笅闄嶏級銆?/p>
鐜拌薄錛氬崰絀烘瘮璋冭妭鑷?0% 鏃惰礋杞戒粛寰寒錛屾垨璋冭妭鑷?100% 鏃朵寒搴︽湭杈炬渶澶у�箋�?br class="container-utlnW2 wrapper-d0Cc1k undefined" style="border: 0px solid; box-sizing: border-box; margin: 1em; padding: 0px; -webkit-font-smoothing: antialiased; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); outline: none; font-size: 18.75px; content: ""; display: block;"/>鏍稿績鍘熷洜錛?/p>
瑙ｅ喅姝ラ錛?/p>
瑙ｅ喅 鈥滄渶浣庝寒搴﹀井浜�?/span>錛?/p>
媯�(gè)鏌ラ┍鍔ㄨ姱鐗囨紡鐢墊祦錛氭煡闃?datasheet 涓殑 鈥淚_OFF鈥?鍙傛暟錛堟甯稿簲 < 1渭A錛夛紝鑻ユ紡鐢墊祦榪囧ぇ錛屾洿鎹綆婕忕數(shù)嫻佽姱鐗囷紙濡傚皢 PT4115 鏇存崲涓?SM2082錛屾紡鐢墊祦鏇翠綆錛夛紱
鎺掓煡瀵勭敓鍥炶礬錛氳嫢 LED 鐏澘鏈夊涓�氶亾錛屾鏌ユ槸鍚﹀瓨鍦ㄨ法閫氶亾鐨勭數(shù)嫻佸洖璺紙濡傛煇涓?LED 鐏彔鍙嶅悜鍑葷┛錛屽鑷寸數(shù)嫻侀�氳繃鍏朵粬璺緞嫻佽繃錛夛紝鐢ㄤ竾鐢ㄨ〃嫻嬮噺 LED 涓ょ鍙嶅悜鐢?shù)闃诲Q岃嫢涓?0 鍒欑伅鐝犳崯鍧忥紝闇�鏇存崲銆?/p>
瑙ｅ喅 鈥滄渶楂樹寒搴︿笉瓚斥�?/span>錛?/p>
紜 PWM 鍗犵┖姣斾笂闄愶細(xì)鐢ㄧず娉㈠櫒嫻嬮噺淇″彿婧愭渶澶у崰絀烘瘮錛岃嫢鏈揪 100%錛堝 MCU 紼嬪簭涓崰絀烘瘮璁＄畻閿欒錛屼笂闄愯涓?90%錛夛紝淇紼嬪簭鎴栬皟鏁磋皟鍏夊櫒鐨勬満姊伴檺浣嶏紱
媯�(gè)鏌ラ┍鍔ㄨ緭鍑鴻兘鍔涳細(xì)鐢ㄤ竾鐢ㄨ〃嫻嬮噺璐熻澆涓ょ鐨勫疄闄呯數(shù)嫻侊紙濡?LED 鐏覆鐨勫伐浣滅數(shù)嫻侊級錛岃嫢浣庝簬棰濆畾鍊鹼紝璋冩暣椹卞姩鑺墖鐨?鈥滅數(shù)嫻佽瀹氱數(shù)闃燴�濓紙濡?PT4115 鐨?R_CS 鐢?shù)闃诲Q屽叕寮忎負(fù) I_OUT=0.1/R_CS錛岄渶鍑忓皬 R_CS 浠ユ彁鍗囩數(shù)嫻侊紝娉ㄦ剰涓嶈秴榪囪姱鐗囨渶澶ц緭鍑猴級銆?/p>
鐜拌薄錛氳皟鍏夎繃紼嬩腑 LED 鐏彔鐑ф瘉銆佸彂榛戯紝鎴栫數(shù)鏈鴻皟鍏夋椂鍗￠】銆佸紓鍝嶅悗鍋滆漿銆?br class="container-utlnW2 wrapper-d0Cc1k undefined" style="border: 0px solid; box-sizing: border-box; margin: 1em; padding: 0px; -webkit-font-smoothing: antialiased; -webkit-tap-highlight-color: rgba(0, 0, 0, 0); outline: none; font-size: 18.75px; content: ""; display: block;"/>鏍稿績鍘熷洜錛?/p>
瑙ｅ喅姝ラ錛?/p>
鎺掓煡榪囧帇 / 榪囨祦錛?/p>
鐢ㄧず娉㈠櫒鎹曟崏鏁呴殰鐬棿鐨?PWM 淇″彿錛岃嫢鍑虹幇 鈥滃崰絀烘瘮紿佸彉鈥濓紙濡傜獊鐒朵粠 50% 璺寵嚦 100%錛夛紝媯�(gè)鏌ヤ俊鍙鋒簮鏄惁鍙楀共鎵幫紙濡?MCU 紼嬪簭璺戦錛岄渶澧炲姞杞歡婊ゆ嘗綆楁硶錛屽澶氭閲囨牱鍙栧鉤鍧囧�鹼級錛?/p>
鍦ㄩ┍鍔ㄨ緭鍑虹涓茶仈鐢墊祦淇濋櫓涓濓紙棰濆畾鐢墊祦涓鴻礋杞介瀹氱數(shù)嫻佺殑 1.2 鍊嶏級錛屾垨浣跨敤甯﹁繃嫻佷繚鎶ょ殑椹卞姩鑺墖錛堝 LM3409錛岃繃嫻佹椂鑷姩闄愭祦錛夛紝閬垮厤璐熻澆鐑ф瘉銆?/p>
寮哄寲鏁ｇ儹璁捐錛?/p>
椹卞姩鑺墖錛氳嫢鑺墖娓╁崌瓚呰繃 60鈩冿紙鎵嬫懜鐑墜錛夛紝闇�鐒婃帴鍦ㄩ摑鍒舵暎鐑墖涓婏紙鏁ｇ儹鐗囬潰縐牴鎹姛鑰楄綆楋紝涓�鑸瘡 1W 鍔熻�楅渶 10cm虜 鏁ｇ儹闈㈢Н錛夛紝鎴栧湪鑺墖涓庢暎鐑墖涔嬮棿娑傚鐑鑴傦紙瀵肩儹緋繪暟鈮?.5W/m銉籏錛夛紱
璐熻澆绔細(xì)LED 鐏澘闇�棰勭暀鏁ｇ儹絀洪棿錛岄伩鍏嶅瘑灝佸湪瀵嗛棴澶栧３涓紱鐢墊満闇�瀹氭湡娓呯悊鏁ｇ儹椋庢墖錛岀‘淇濋�氶鑹ソ銆?/p>
鍓嶆湡鍙傛暟鍖歸厤錛?/p>
椹卞姩鑺墖涓庤礋杞斤細(xì)涓ユ牸鎸夌収 鈥滆礋杞介瀹氱數(shù)鍘?/ 鐢墊祦 鈮?椹卞姩杈撳嚭涓婇檺鈥?閫夊瀷錛岄伩鍏嶈繃杞斤紙濡?LED 鐏覆鐢?shù)鍘?12V錛岄┍鍔ㄨ緭鍑虹數(shù)鍘嬮渶鈮?2V錛岀數(shù)嫻侀渶鍖歸厤錛夛紱
PWM 棰戠巼錛氫紭鍏堥�夋嫨 100Hz-1kHz錛堝吋欏炬棤闂儊鍜岃皟鍏夌簿搴︼紝棰戠巼榪囬珮浼?xì)澧炲姞椹卞姩鑺墖鍔熻�楋級銆?/p>
紜歡鎶楀共鎵拌璁?/span>錛?/p>
瀹氭湡緇存姢錛?/p>
閫氳繃浠ヤ笂鍒嗙被鎺掓煡錛屽彲瑕嗙洊 90% 浠ヤ笂鐨?PWM 璋冨厜鏁呴殰銆傝嫢鏁呴殰浠嶆湭瑙ｅ喅錛屽緩璁敤 鈥滄浛鎹㈡硶鈥濓紙鏇存崲澶囩敤淇″彿婧愩�侀┍鍔ㄨ姱鐗囥�佽礋杞斤級閫愭瀹氫綅闂鐐癸紝鍚屾椂緇撳悎鍣ㄤ歡 datasheet 涓殑鐢墊皵鍙傛暟鍜屽吀鍨嬪簲鐢ㄧ數(shù)璺紝紜繚姣忎竴姝ユ搷浣滅鍚堟妧鏈鑼冦�?/p>
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