A lithium battery powers the system and several dc-dc converters change the battery voltage into the voltages required by the loads. A buck converter produces low voltage dc required by the microprocessor. A boost converter increases the battery voltage to the level needed by the disk drive. An inverter produces high voltage high frequency ac to drive the lamps that light the display. A transformer isolation converts the ac line voltage into dc to charge the battery. The converter switching frequencies are in the range of several 100 KHz which leads to the substantial reduction in weight and size of the reactive elements. Power management is used to control sleep modes in which power consumption is reduced and battery life is extended.
No comments:
Post a Comment