| 摘要 |
<p>An electronic apparatus comprises a main circuit (9) having a main CPU (9a) and a power supply system which includes plural main batteries (1, 2) for supplying operating power to said main circuit, a back-up battery (18), switching means (3-4) connected between each main battery and the main circuit, starting means for enabling the operation of the main circuit (9), detection means (8) for detecting the charging level of each main battery (1, 2), and power control means (7) responsive to the starting means and the detection means and having a sub-CPU (7a) for individually controlling the switching means (3-4) according to either a single-connection mode or a multiple-connection mode. In the single-connection mode only one of the main batteries is connected to said main circuit. In the multiple-connection mode, at least two main batteries, each in series with a respective diode means (4a, 6a), are connected in parallel to the main circuit (9). The back-up battery is connected to supply power to the power control means (7) only when either no main battery is installed or the charging level of each of the installed main batteries is below a predetermined value required for back-up operation. <IMAGE></p> |
