Siv multimeter los ntsuas qhov tso zis voltage ntawm LED teeb tsav lub zog: 319V
Cov khoom siv hluav taws xob LED yog qhov tam sim no tsav lub zog hluav taws xob nrog cov zis hluav taws xob ntau ntawm 125V ~ 140V, cov zis tam sim no ntawm 360mA ± 3%, thiab kev siv hluav taws xob txog li 60W. Nws txhais tau hais tias nyob rau hauv qhov voltage ntau ntawm 125V ~ 140V, cov zis tam sim no yog 360mA. Noj 3V / 2W LED teeb hlaws dai ua piv txwv, los ntawm 125/3≈41.7 thiab 140/3≈46.7, nws tuaj yeem pom tau tias LED tsav tsheb fais fab tuaj yeem txuas 42 mus rau 47 LED teeb hlaws hauv series.
Yog vim li cas tus nqi voltage ntsuas ntawm tsis muaj load 319V? Raws li U=IR, txawm tias qhov kev tiv thaiv loj npaum li cas, thaum tam sim no kuv =0, nws tus nqi hluav taws xob kuj yog 0. Yog li ntawd, nyob rau hauv qhov tam sim no qhov chaw, thaum lub load tam sim no yog 0 (tsis muaj load), series tam sim no-limiting resistor los yog tam sim no-limiting circuit xws li lub capacitance kauj ruam-down tsis txo qhov voltage. Tus nqi ntsuas qhov tseeb yog qhov kho thiab lim DC ntawm 220V AC. Qhov hluav taws xob, qhov tsis muaj qhov hluav taws xob tso tawm hluav taws xob ntawm 220V rectifier lim yog 220V * 1. . Daim duab hauv qab no yog LED tsis tu ncua tam sim no tsav lub zog tsim los siv PT4207 high-voltage step-down LED tsav tswj nti. PT4207 muaj ib tug built-in 350mA hloov thiab yog txawm peem rau nrog ib tug sab nraud MOS raj hloov tsav chaw nres nkoj. Rau cov ntawv thov qis dua 350mA, tsis tas yuav tsum tau hloov MOS raj sab nraud. , thaum tsav tsheb tam sim no ntau dua 350mA, tam sim no tuaj yeem nthuav dav los ntawm lub raj MOS sab nraud.
