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本装置极为简单,如图1所示。原理简述如下: 当水位低于A点时,探头A、B开路,12V电压经R2、R3为BG提供基极电流,BG饱和,J吸合,开始上水。当探头超过A时,R1开始分流,BG退出饱和进入放大状态,集电极电流减小,但因J已经吸合,只需较小的电流仍能保证它可靠吸合,水泵继续上水。当水位到达探头B时,BG截止,J释放,水泵停止上水。当水位开始下降至B点以下时,BG进入放大状态,但这时的集电极电流太小,不足以使J吸合,只有当水位低于A点时,BG饱和导通,J才吸合上水。图中的R1、R2、R3需耐心调试确定,J建议用JQX—4F。
The device is extremely simple, as shown in Figure 1. The principle is briefly described as follows: When the water level is lower than A point, the probe A, B open circuit, 12V voltage through R2, R3 for the BG to provide base current, BG saturation, J suction, start Sheung Shui. When the probe exceeds A, R1 starts to shunt, BG exits saturation to enter the amplified state, the collector current decreases, but because J has been sucked in, only a small current can still guarantee its reliable pull, the pump to continue the water. When the water level reaches the probe B, BG deadline, J release, the water pump to stop. When the water level starts to drop below the B point, the BG enters the amplification state, but the collector current is too small at this time to pull the J in. Only when the water level is lower than the A point, the BG is saturated and the J is pulled Sheung Shui. Figure R1, R2, R3 need to be patiently determined to determine, J recommended JQX-4F.