发明名称 DRIVE CIRCUIT OF LED LAMP
摘要 PURPOSE:To enhance the universality with common circuit and to increase the lifetime by stabilizing the intensity of the LED by connecting a constant current circuit to an input terminal of a power source, driving an LED by the constant current from the power source. CONSTITUTION:When LED group are connected between a positive terminal 3 and a ground terminal 10 of a power source, a protection diode 4 is inserted to the terminal 3 side, and a constant current circuit 5 is inserted between the terminals 3 and 10. In this structure, the circuit 5 is formed of resistors 6, 14, current limiting transistors 7, 13, the current supplied to the LED group 8 is detected by the resistor 6, the result is inverted by using the transistor 13, and supplied to the base of the transistor 7. Thus, when the potential E applied to the terminal 3 is raised, the collector current of the transistor 7 increases, the current to the LED group 8 tends to increase, but the collector current of the transistor 13 increases by the large voltage value produced between the ends of the resistor 6, and the base current of the transistor 6, on the contrary, decreases correspondingly.
申请公布号 JPS6054483(A) 申请公布日期 1985.03.28
申请号 JP19830161921 申请日期 1983.09.05
申请人 NIHON DENYOO KK 发明人 MIYAMOTO HITOSHI
分类号 H01L33/00;G08B5/36;H05B33/08;H05B37/02 主分类号 H01L33/00
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