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图1的线路特点:充电器与蓄电池连接即充电;充电器与蓄电池脱离,充电器输出端无电压;充电器与蓄电池的极性接反,充电器也不被破坏,发光二极管LED发亮表示“接反”。蓄电池和充电器不连接时,三端双向可控硅处在开路状态,充电器输出端1、2无电压而安全。蓄电池按图那样与充电器的接头1、2连接,蓄电池的残余电荷使弛张振荡器工作,驱动晶体三极管Q,三端双向可控硅刀佃被触发。若弛张振荡器的频率选在1K以上,蓄电池在充电时,则BCR必然被触发。
The circuit of Fig. 1 features: the charger is connected with the battery and charged; the charger is disconnected from the battery, the charger has no voltage at the output; the polarity of the charger and the battery is reversed, the charger is not damaged, and the LED is illuminated “Reversed.” When the battery and the charger are not connected, the triac is in an open state, and the charger output 1 and 2 have no voltage and are safe. The battery according to the figure that is connected with the charger connector 1, 2, the residual charge of the battery so that the relaxation oscillator, driving the transistor Q, the triac is triggered. If the frequency of relaxation oscillator is selected above 1K, the battery is charging, then the BCR is bound to be triggered.