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该种不间断电源电路简单容易制作,且具有充电自动控制电路,供电电池保护功能的特点。本种装置可以与一些低电压供电设备配合使用(如低电压照明、黑白电视机备用电源等)。一、充电过程图1中,当有市电220V供电时,变压器次级输出17.5V电压,经D_1半波整流出脉动直流电压,通过R_1、D_2触发可控硅KG_1,使KG_1导通实现对蓄电池大电流充电。随充电时间的增长,电池两端电压逐渐上升(12V升高到15V),此时R_2、R_3分压所得电压使D_3
This kind of uninterruptible power supply circuit is simple and easy to make, and has a charge automatic control circuit, power supply battery protection features. The device can be used with some low voltage power supply equipment (such as low voltage lighting, black and white TV backup power supply, etc.). First, the charging process Figure 1, when the city 220V power supply, the transformer secondary output voltage of 17.5V, D_1 half wave rectified pulsating DC voltage through R_1, D_2 trigger thyristor KG_1, KG_1 conduction to achieve Battery high current charging. With the increase of charging time, the voltage across the battery gradually rises (12V rises to 15V). At this moment, the voltage obtained from the partial pressure of R_2 and R_3 makes D_3