| 摘要 |
PROBLEM TO BE SOLVED: To provide a DC-DC converter capable of obtaining a proper droop action corresponding to an operation condition by switching the constant voltage control and the current control according to the condition of temperature, output current and output voltage. SOLUTION: In the DC-DC converter, the pulse width control amount is obtained from the output voltage sent from the output voltage detecting section detecting the output voltage while the pulse width control amount is obtained from the output current sent from the output current detecting section detecting the output current. A setting current value (droop action start current) is obtained from the output voltage, output current and temperature each sent from the output voltage detecting section, output current detecting section each at a control method selecting section and the temperature detecting section detecting the temperature. Immediately when updating is performed, a control mode of the constant voltage control and the current control (droop action state) is discriminated, and the pulse width control amount obtained from the voltage deviation in case of the constant voltage control or the pulse width control amount obtained from the current deviation in case of the current control is used, corresponding to the discriminated control mode, to update the pulse width at the pulse width generating section to output the pulse to the switching section. COPYRIGHT: (C)2007,JPO&INPIT
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