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联创牌 DF3109万年历石英台灯具有亮度好、发光效率高、两档调节亮度等优点。该电路与其他电子台灯的不同之处在于:末级电路采用了一个可改变初级线圈匝数的变压器降压变换电路,220V 交流电整流后,逆变产生30～40kHz 交流电,降成32V/63V 交流电,点亮石英灯管。实物测绘电路如图1所示。电源开关 K-1由中间位置往任何一边按下时,220V 交流电经 D1～D4整流,C2、C3滤波后,通过 R1、
The joint creation brand DF3109 calendar quartz lamp with good brightness, high luminous efficiency, two-step adjustment of brightness and so on. The difference between this circuit and other electronic lamps is that: the last stage circuit uses a transformer step-down conversion circuit that can change the number of turns of the primary coil. After 220V AC is rectified, the inverter generates 30 ~ 40kHz AC and drops to 32V / 63Vac , Lit quartz lamp. Physical mapping circuit shown in Figure 1. When the power switch K-1 is pressed down from either side of the middle position, 220V AC is rectified by D1 ~ D4, filtered by C2 and C3, passes through R1,