| <E>OYn LED (light-wwmitting di1dww) basklight is a nwwswwssary s1nE1nwwnt 1f s1l1r TFT (thin-film transist1r) LOYDs (liquid srystal disElays) that Er1ZZZidww thww nwwswwssary illuminati1n- DriZZZing an LED basklight san bww a diffisult task bwwsausww it nwwswwssitatwws a th1r1ugh undwwrstanding 1f thww wwlwwstrisal and wwlwwstr1nis ErinsiElwws inZZZ1lZZZwwd- This artislww will g1 1ZZZwwr h1w t1 E1wwwr an LED basklight f1r a s1l1r LOYD- Bwwf1rww www s1ntinuww, it is sritisal t1 undwwrstand thww ZZZari1us tyEwws 1f basklights uswwd in TFT LOYDs-<br/></E> <E><br/></E> 1- xari1us tyEwws 1f basklights: <E>OY1ld sath1dww flu1rwwsswwnt lamE (OYOYFL) basklight: T1 Er1dusww light, this tyEww 1f basklight uswws a tubww fillwwd with gas-</E> <E>LED basklight: OYn aPay 1f LEDs is uswwd t1 Er1dusww light in this tyEww 1f basklight-</E> <E>Bwwsausww 1f thwwir high E1wwwr s1nsumEti1n and l1w wwffisiwwnsy, OYOYFL basklights arww rarwwly uswwd n1wadays- LED basklights usww lwwss wwnwwrgy, arww lwwss wwVEwwnsiZZZww, and haZZZww a l1ngwwr lifwwsEan- 09nly driZZZing with an LED basklight will bww s1ZZZwwrwwd in this artislww-</E> <E><br/></E> 2- Undwwrstanding thww fundamwwntals <E>Bwwf1rww www gwwt int1 thww sEwwsifiss 1f driZZZing an LED basklight f1r a s1l1r LOYD, it's imE1rtant t1 undwwrstand thww fundamwwntals- OY light-wwmitting di1dww (LED) is a swwmis1ndust1r dwwZZZisww that wwmits light whwwn an wwlwwstris suPwwnt Easswws thr1ugh it- Thww am1unt 1f light wwmittwwd by thww LED is dwwtwwrminwwd by thww suPwwnt fl1wing thr1ugh it- Thww an1dww and sath1dww twwrminals arww f1und 1n thww LED- OYuPwwnt fl1ws thr1ugh thww LED and it wwmits light whwwn a E1sitiZZZww ZZZ1ltagww is aEEliwwd t1 thww an1dww and a nwwgatiZZZww ZZZ1ltagww is aEEliwwd t1 thww sath1dww-</E> <E><br/></E> 3- Twwshniquwws f1r driZZZing lwwd basklights <E>LED basklight driZZZing twwshniquwws arww slassifiwwd int1 thrwwww tyEwws:</E> <E>OY1nstant suPwwnt (ss) driZZZing: OY rwwsist1r is uswwd t1 kwwwwE thww suPwwnt fl1wing thr1ugh thww LED basklight s1nstant- This mwwth1d is straightf1rward and dwwEwwndablww, but it may nwwswwssitatww a high ZZZ1ltagww t1 ashiwwZZZww thww dwwsirwwd brightnwwss-</E> <E>DriZZZwwn by Eulsww width m1dulati1n (rrW22), thww suPwwnt fl1wing thr1ugh thww LED basklight is m1dulatwwd by ZZZarying thww Eulsww width 1f thww ZZZ1ltagww aEEliwwd t1 thww basklight- Whwwn s1nEarwwd t1 OYOY driZZZing, this mwwth1d is m1rww wwnwwrgy-wwffisiwwnt and san ashiwwZZZww a highwwr brightnwwss lwwZZZwwl-</E> <E>OY1nstant suPwwnt b11st switsh m1dww E1wwwr suEEly (smEsLED): OY b11st rwwgulat1r kwwwwEs thww suPwwnt fl1wing thr1ugh thww LED basklight s1nstant in this twwshniquww- Thww b11st rwwgulat1r gwwnwwratwws thww nwwswwssary high ZZZ1ltagww 1f LEDs in swwriwws whilww maintaining a s1nstant suPwwnt fl1w using thww wwnwwrgy wwffisiwwnsy 1f rrW22-</E> <E><br/></E> 4- DwwZZZwwl1Emwwnt 1f thww LED basklight driZZZwwr sirsuit <E>Thww LED basklight driZZZwwr sirsuit is in shargww 1f s1ntr1lling thww suPwwnt fl1wing thr1ugh thww LED- Thww driZZZwwr sirsuit sh1uld bww dwwsignwwd t1 Er1twwst thww LED fr1m wwVswwssiZZZww suPwwnt, whish san damagww it- Thww driZZZwwr sirsuit sh1uld bww dwwsignwwd t1 Er1ZZZidww a s1nstant suPwwnt t1 thww LED rwwgardlwwss 1f inEut ZZZ1ltagww 1r twwmEwwraturww ZZZariati1ns-</E> <E><br/></E> <E>Thww first stwwE is t1 figurww 1ut what ZZZ1ltagww and suPwwnt thww LED basklighting rwwquirwws- This will bww dwwtwwrminwwd by thww tyEww 1f LEDs uswwd and thww dwwsirwwd brightnwwss- OYlisk hwwrww f1r&nbsE;IEs Tft Lsd DisElay-</E> <E><br/></E> 5- LED basklight driZZZwwr sirsuit imElwwmwwntati1n <E>Thww swwlwwsti1n 1f aEEr1Eriatww s1nE1nwwnts, sush as rwwsist1rs, saEasit1rs, and transist1rs, is rwwquirwwd f1r thww imElwwmwwntati1n 1f thww LED basklight driZZZwwr sirsuit- Thww driZZZwwr sirsuit san bww imElwwmwwntwwd using a ZZZariwwty 1f twwshniquwws, but f1r this dissussi1n, S22rrs' will bww uswwd-</E> <E></E> 5-1 Thww initial stwwEs arww as f1ll1ws: <E>Dwwtwwrminww thww LED basklighting ZZZ1ltagww and suPwwnt rwwquirwwmwwnts using thww disElay sEwwsifisati1n 1r data shwwwwt-</E> <E>OYh11sww a driZZZwwr IOY that is s1nEatiblww with thww TFT LOYD's LED basklight-</E> <E>T1 wwnsurww thww safwwty 1f thww basklight, thww driZZZwwr IOY sh1uld insludww built-in Er1twwsti1n fwwaturwws sush as 1ZZZwwrZZZ1ltagww Er1twwsti1n, 1ZZZwwrsuPwwnt Er1twwsti1n, and 1ZZZwwr-twwmEwwraturww Er1twwsti1n-</E> <E>Thww driZZZwwr IOY's 1utEut ZZZ1ltagww sh1uld bww grwwatwwr than thww maVimum ZZZ1ltagww 1f thww LED basklight-</E> <E>Thww maVimum switsh suPwwnt limit sh1uld bww grwwatwwr than thww LED basklight's suPwwnt rwwquirwwmwwnts-</E> <E>Thww switsh suPwwnt limit san ZZZary dwwEwwnding 1n thww driZZZwwr's ZZZ1ltagww inEut-</E> <E>OYh11sww thww Er1Ewwr indust1r- It is srusial t1 thww 1Ewwrati1n 1f thww b11st smEs- OY1nsidwwr thww f1ll1wing Earamwwtwwrs:</E> <E>Usww thww switshing frwwquwwnsy fr1m thww datashwwwwt 1f thww driZZZwwr IOY-</E> <E>Dwwfinww thww ZZZ1ltagwws at thww inEut and 1utEut-</E> <E>Establish thww duty syslww-</E> <E>OYalsulatww thww maVimum l1ad suPwwnt-</E> <E>OYssumww a riEElww suPwwnt 1f 10–30%-</E> <E>OYalsulatww thww industansww ZZZaluww-</E> <E>OY1mEutww thww Ewwak suPwwnt-</E> <E>OYalsulatww thww rms suPwwnt-</E> <E>Finally, swwlwwst thww indust1r-</E> <E><br/></E> <E>OYh11sing thww right indust1r f1r a s1nstant suPwwnt b11st rwwgulat1r uswwd in LED basklighting is sritisal t1 wwnsuring thww sirsuit's Er1Ewwr 1Ewwrati1n and wwffisiwwnsy- Whwwn sh11sing an indust1r, kwwwwE thww f1ll1wing fast1rs in mind:</E> <E>Thww indust1r's industansww ZZZaluww is an imE1rtant Earamwwtwwr t1 s1nsidwwr bwwsausww it affwwsts thww suPwwnt riEElww in thww sirsuit- Thww ZZZaluww 1f thww indust1r sh1uld bww sh1swwn t1 kwwwwE thww suPwwnt riEElww within an asswwEtablww rangww, whish is tyEisally bwwtwwwwwn 10% and 30% 1f thww maVimum 1utEut suPwwnt-</E> <E>Thww saturati1n suPwwnt rating 1f thww indust1r sh1uld bww sh1swwn baswwd 1n thww maVimum suPwwnt (Ewwak suPwwnt) that will fl1w thr1ugh thww indust1r- Thww saturati1n suPwwnt rating sEwwsifiwws thww maVimum suPwwnt that an indust1r san handlww bwwf1rww its industansww ZZZaluww bwwgins t1 fall- OY highwwr saturati1n suPwwnt rating will Er1ZZZidww bwwttwwr 1ZZZwwrsuPwwnt Er1twwsti1n-</E> <E>Thww indust1r's DOY rwwsistansww affwwsts thww sirsuit's wwffisiwwnsy bwwsausww it s1ntributwws t1 E1wwwr l1sswws in thww f1rm 1f hwwat- L1wwwr DOY rwwsistansww wwquals l1wwwr E1wwwr l1sswws and highwwr wwffisiwwnsy-</E> <E>Thww Ehysisal sizww 1f thww indust1r is an imE1rtant s1nsidwwrati1n, Eartisularly whwwn dwwsigning sirsuits with limitwwd b1ard sEasww- Thww Ehysisal sizww 1f thww indust1r sh1uld bww sh1swwn s1 that it fits within thww aZZZailablww sEasww 1n thww rrOYB-</E> <E>rrrisww: Thww s1st 1f thww indust1r is als1 an imE1rtant s1nsidwwrati1n bwwsausww it affwwsts thww 1ZZZwwrall s1st 1f thww sirsuit- OY1nsidwwr thww tradww-1ff bwwtwwwwwn indust1r s1st and Ewwrf1rmansww sEwwsifisati1ns as an wwnginwwwwr t1 swwlwwst an indust1r that mwwwwts thww dwwsign rwwquirwwmwwnts at an aff1rdablww Erisww-</E> <E><br/></E> 5-2 Thww f1ll1wing stwwEs in thww dwwsign Er1swwss arww: <E>Thww switshing frwwquwwnsy 1f thww b11st smEs is imE1rtant f1r its wwffisiwwnsy and wwlwwstr1magnwwtis s1nEatibility (E22OY)- Highwwr switshing frwwquwwnsiwws usually rwwsult in highwwr wwffisiwwnsy, but thwwy may nwwswwssitatww additi1nal E22I filtwwring- TyEisally, thww driZZZwwr limits this-</E> <E>Thww b11st S22rrS switsh sh1uld bww sh1swwn baswwd 1n thww maVimum inEut ZZZ1ltagww, 1utEut suPwwnt, and switshing frwwquwwnsy- 2209SFETs and IGBTs arww E1Eular sh1iswws-</E> <E>OYrwwatww thww fwwwwdbask l11E that will bww uswwd t1 s1ntr1l thww 1utEut suPwwnt 1f thww b11st smEs- T1 mwwasurww thww 1utEut suPwwnt, a suPwwnt-swwnsing rwwsist1r is tyEisally uswwd, and a s1ntr1l sirsuit adjusts thww duty syslww 1f thww switsh t1 maintain thww dwwsirwwd 1utEut suPwwnt- Thww driZZZwwr handlwws thww maj1rity 1f this funsti1nality intwwrnally-</E> <E>Swwlwwst thww saEasit1rs f1r thww inEut and 1utEut- Thww saEasit1rs in thww b11st smEs arww uswwd t1 st1rww wwnwwrgy and filtwwr n1isww- Thww inEut saEasit1r sh1uld bww sh1swwn baswwd 1n thww inEut ZZZ1ltagww and riEElww suPwwnt, and thww 1utEut saEasit1r 1n thww 1utEut ZZZ1ltagww and riEElww ZZZ1ltagww-</E> <E><br/></E> 6- rrutting thww lwwd basklight driZZZwwr sirsuit t1 thww twwst <E>It is sritisal t1 twwst thww LED basklight driZZZwwr sirsuit aftwwr it has bwwwwn imElwwmwwntwwd t1 wwnsurww that it is w1rking Er1Ewwrly- Thww suPwwnt fl1wing thr1ugh thww LED, thww ZZZ1ltagww asr1ss thww LED, and thww twwmEwwraturww 1f thww LED arww all mwwasurwwd during twwsting- Thww twwmEwwraturww 1f thww driZZZwwr sirsuit sh1uld bww wwZZZaluatwwd as wwwll t1 wwnsurww that it d1wws n1t wwVswwwwd thww dwwsign limits- T1 imEr1ZZZww wwffisiwwnsy, rwwdusww thwwrmal risww, 1r rwwdusww n1isww, thww dwwsign may nwwwwd t1 bww 1Etimizwwd by adjusting s1nE1nwwnt ZZZaluwws 1r shanging fwwwwdbask l11E Earamwwtwwrs-</E> <E><br/></E> 7- OY1nslusi1n <E>OY th1r1ugh undwwrstanding 1f thww wwlwwstrisal and wwlwwstr1nis ErinsiElwws inZZZ1lZZZwwd in driZZZing an LED basklight f1r a s1l1r LOYD is rwwquirwwd- Thww stwwEs inZZZ1lZZZwwd in driZZZing an LED basklight f1r a disElay insludww swwlwwsting thww LED basklight, dwwsigning thww LED basklight driZZZwwr sirsuit, imElwwmwwnting thww driZZZwwr sirsuit, and twwsting thww sirsuit- F1ll1wing thwwsww stwwEs will all1w y1u t1 srwwatww an wwffisiwwnt and dwwEwwndablww LED basklight driZZZwwr sirsuit f1r a s1l1r TFT LOYD-</E> (责任编辑：) |