| 摘要 |
<P>PROBLEM TO BE SOLVED: To continue power supply to an amplifier, even if power exceeding maximum supply power is consumed temporarily in the amplifier. <P>SOLUTION: Power from an USB terminal 1 is stepped up to 100 V by a switching regulator 10 before being charged into an electrolytic capacitor 30. After the electrolytic capacitor is charged, the power is stepped down to a power of 5 V for an amplifier 12 by a switching regulator 11. When power consumed in the amplifier 12 exceeds the maximum supply power of the USB standard, charges stored in the electrolytic capacitor 30 are discharged and stepped down to 5 V by a switching regulator 11 and then is used. Consequently, the driving of the amplifier 12 is continued with no trouble, even when the maximum supply power of the USB terminal 1 is exceeded. <P>COPYRIGHT: (C)2008,JPO&INPIT |
