| 摘要 |
PURPOSE:To perform an accurate battery check independently of the capacity and the state of the battery, by operating a DC-DC converter to supply power to an actual load and a dummy load resistance corresponding to the load of a control operation circuit. CONSTITUTION:When a battery checking switch 110 is closed, a DC-DC converter 109 is turned on because a terminal A is grounded, and power is supplied to a load 111. An NPN transistor TR 112 is turned off because the base terminal of the TR becomes low-level, and a PNP TR 113 is turned on, and therefore, power is not supplied to a control operation circuit 104. The voltage of a battery 101 deflects the needle of a meter 108 through the TR 113 and a meter deflection angle adjusting resistance 106 to display the battery check. Since the DC-DC converter 109 is turned on to the supply power to the load 111 and a dummy load resistance 107, a load approximately equal to the actual load in the camera operation time is applied to the battery 101. |
