Bari mu ga yadda muka lissafta resistors for LED

Lissafi na resistors for LEDs - wannan ne mai matukar muhimmanci aiki da cewa ya kamata a da za'ayi kafin ka gama da LED ga wutan lantarki. Wannan zai ƙayyade kwaikwayon na biyu da diode kuma dukan kewaye. A resistor dole ne a kunshe a cikin da'ira a jerin tare da wani LED. Wannan kashi da aka tsara don rage halin yanzu gudãna ta cikin diode. Idan resistor yana da wani maras muhimmanci juriya ƙananan fiye da ake bukata, sa'an nan da ya jagoranci zai kasa (ya ƙone fita), kuma idan da darajar wannan siga zai zama ya fi zama dole, da haske daga semiconductor kashi zai zama ma dushe.

Lissafin lokuttan resistors ga LEDs ya kamata a yi ta da wadannan dabara R = (US - UL) / I, inda:

• Amurka - wadata irin ƙarfin lantarki.
• UL - ƙarfin lantarki diode ikon (yawanci 2 volts da kuma 4);
• I - yanzu na diode.

Tabbata a tabbatar da cewa zaba darajar da lantarki halin yanzu shi ne karami fiye da matsakaicin halin yanzu tamanin da semiconductor kashi. Kafin a ci gaba da lissafi, dole ne ka saita wannan darajar a amps. Yawancin lokaci shi ne a cikin fasfo data kayyade a milliamps. Saboda haka, a sakamakon lissafin da aka samu darajar da maras muhimmanci juriya na resistor a ohms. Idan sakamakon darajar ba zai zama iri ɗaya tare da wani misali resistor, ya kamata ka zaɓa mafi kusa da girma da matsayin da. Ko yana yiwuwa a gama a jerin dama karami maras juriya abubuwa haka cewa jimlar daidai da manufa juriya.

Alal misali, wannan shi ne yadda muka lissafta resistors for LEDs. Bari mu ɗauka cewa muna da ikon samar da wani irin ƙarfin lantarki fitarwa na 12 volts, da kuma wani LED (UL = 4 V). The ake bukata yanzu shi ne 20 Ma. Mun fassara shi zuwa samu 0.02 amps da A. mu iya yanzu ci gaba da lissafi na R = (12 - 4) / 0.02 = 400 ohms.

Yanzu la'akari da yadda lissafi ya kamata a da za'ayi a jerin dangane da wani jam'i na semiconductor abubuwa. Wannan shi ne musamman gaskiya a lõkacin da aiki tare da LED tube. A jerin dangane rage ikon amfani da damar a lokaci guda gama babban adadin abubuwa. Lura, duk da haka, cewa duk cikin jerin-da alaka LEDs dole ne na wannan type, da kuma samar da wutar lantarki - isasshe m. Wannan hanya ya kamata lissafi resistors for LEDs a jerin connection. Ɗauka cewa muna da sarkar na 3 abubuwa (kowane irin ƙarfin lantarki ne 4 volts) da kuma 15-volt samar da wutar lantarki. Mun sanin da irin ƙarfin lantarki UL. Don wannan dole ne a kara wa kowane daga cikin diodes Figures 4 + 4 + 4 = 12 volts. Fasfo LED halin yanzu darajar 0.02 A, mun lissafta R = (15-12) / 0,02 = 150 ohms.

Yana da muhimmanci a tuna cewa a layi daya dangane da LEDs, a saka shi mai laushi, wani mugun ra'ayin. The abu ne cewa wadannan abubuwa suna da wani bambancin da sigogi, kowanne daga abin da bukatar daban-daban voltages. Wannan take kaiwa zuwa gaskiya cewa lissafi na LEDs - shi ne mai aikin banza. Tare da wannan connection, kowane kashi yi haske da hantsinta. A halin da ake ciki za a iya ceto kawai ta mai da iyakance resistor ga kowane diode dabam.

A ƙarshe, mun ƙara da cewa bisa wannan ka'ida an lasafta duk LED taro ciki har da fitilun da LEDs. Idan kana so ka kai-tara da irin wannan tsarin, da data lissafin for za ku zama dacewa.