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本文介绍一款大功率轿车电瓶代用器,其电路原理如附图所示。该电路给轿车维修时提供一个经济实用、稳定且有保护功能的直流电源。电路工作原理:变压器 X1初级线圈输入220V 交流电压,次级输出30V交流电压,经 D1～D4桥式整流,C1、C2两只4700μ F 大容量电容滤波,经保险丝 F1将未稳压的直流电压送至 T1。LM7806(IC)输出端与 T1基极相接,其输入端与 T1集电极相连,公共端与ZDI、LED 串接至地。通过 ZD1和 LED 给IC 公共端提供偏压,从而使 IC 输出电压升高到约13.8V,该电压亦为 T1的
This article describes a high-power car battery replacement device, the circuit as shown in the figure. This circuit provides a cost-effective, stable and protected DC power supply for car repairs. The circuit works: transformer X1 primary coil input 220V AC voltage, the secondary output 30V AC voltage, D1 ~ D4 bridge rectifier, C1, C2 two 4700μ F bulk capacitor filter, the fuse F1 unregulated DC voltage Send to T1. The output of the LM7806 (IC) is connected to the base of T1 and its input is connected to the T1 collector. The common is connected in series with the ZDI and LED. By ZD1 and LED IC to provide public side bias, so that the IC output voltage increased to about 13.8V, the voltage is also T1