ELECTRONIC APPARATUS AND METHOD OF CONTROLLING ELECTRONIC APPARATUS |
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| 申请号 | EP99959798 | 申请日 | 1999-12-14 | 公开(公告)号 | EP1070998A4 | 公开(公告)日 | 2004-11-24 |
| 申请人 | SEIKO EPSON CORP; | 发明人 | YABE HIROSHI; OKEYA MAKOTO; | ||||
| 摘要 | In making a change from a first state in which an electric charge is being transferred from a secondary power source of large capacity to an auxiliary capacitor through a voltage step-up/down circuit with a step-up/down ratio M' (which is a positive real number other than 1) to a second state in which the secondary power source of large capacity and the auxiliary capacitor are directly electrically connected to each other, the electric energy is transferred from the secondary power source of large capacity to the auxiliary capacitor through the step-up/down circuit in a non-step-up/down state with a step-up/down ratio M = 1, so that the potential difference between the secondary power source of large capacity and the auxiliary capacitor is less than a predetermined potential difference. Therefore, there is no possibility of incurring a sharp power source voltage variation due to a change in step-up ratio, so that malfunction of the electronic apparatus that accompanies a sharp voltage variation of the voltage source can be prevented. | ||||||
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