| 摘要 |
<p>PURPOSE:To obtain information on the residual capacity of a battery by a single body by providing a voltage detecting means and a voltage display means which are incorporated and by making display when a detected voltage is higher than a prescribed voltage. CONSTITUTION:A switch means 1 is turned ON. When a voltage E of a battery 15 is E1< E, a Zener diode 4 and LED 7 in a voltage detecting means 2 detect this and the LED 7 is lighted. Herein E1=VP+VZ1 is satisfied. When the voltage E is E2<E, a Zener diode 5 and LED 8 detect this and the LED 8 is lighted. Herein E2=VP+VZ2 is satisfied. When the voltage E is E3< E, moreover, a Zener diode 6 and LED 9 detect this and the LED 9 is lighted. Herein E3=VP+ VZ3 is satisfied. In these equations, VP is a forward voltage of the LEDs 7, 8 and 9 and VZ1, VZ2 and VZ3 are Zener voltages of the Zener diodes 4, 5 and 6 respectively. In other words, a display means 3 operates as a kind of level meter. When the voltage E<=E3, no LED is lighted.</p> |
