| 摘要 |
A voltage conversion circuit is provided for efficiently converting the voltage of a DC power source into a lower voltage in accordance with load currents of voltage converters. An electronic apparatus includes: a DC power source for supplying a first DC supply voltage; a first DC voltage converter for converting the first DC supply voltage into a second DC supply voltage which is lower than the first DC supply voltage; a second DC voltage converter for converting either the first DC supply voltage or the second DC supply voltage at an input voltage terminal thereof into a third DC supply voltage which is lower than the second DC supply voltage; a switch for selecting and supplying one of the first DC supply voltage of the DC power source and the second DC supply voltage of the first DC voltage converter to the input voltage terminal of the second DC voltage converter, in accordance with a control signal; a switching controller for providing the control signal to the switch; and a plurality of components, ones of the components receiving the second DC supply voltage, ones of the components receiving the third DC supply voltage.
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