| 摘要 |
<p>This invention relates to a magnetic card type watthour meter and its automatic calculating and controling system. According to the demand, the power supply department encode on the card that customer purchased the amount purchased power, the time of the peak period, the time of the valley period and the limited amount of the maximum current. The customer input the information written in the card into a single chip microprocessor by passing the card through the cards slot in the watthour meter, the control system of the watthour meter commanded by the microprocessor then controls the power supply automatically, calculates and collects the rate respectively according to different time periods.</p> |
