| 摘要 |
<p>PURPOSE:To reduce charging cost by charging a battery when the time clocked by a clocking means in a time zone most inexpensive in power rates stored in a storage means. CONSTITUTION:A time zone memory part 31 stores power rates for each time zone and the time when the specified time zone starts. For example, suppose the time zone most inexpensive inpower rates is of a single class, say, from midnight (0000) to six o'clock (0600), 0000 is outputted into a comparison circuit 34 as a starting time for charging. A clock circuit 33 clocks the present time and outputs the clocked time into the comparison circuit 34. When the time clocked by the clock circuit 33 is compared with the starting time for charging from a time zone memory part 31 and is coincided with the starting time, a coincidence signal is outputted into a control part 33. The control part 32 receives the coincidence signal from this comparison circuit 34 and charges the battery.</p> |
