| 摘要 |
PROBLEM TO BE SOLVED: To perform normal boosting action by suppressing the improper action of a control circuit 13 caused by the drop of an input DC voltage Vin, in a switched capacitor type stabilization power circuit 11. SOLUTION: This circuit switches the input to a constant voltage circuit 16, which performs power supplying to the control circuit 13, so as to make it as a voltage Vin at a rise of the voltage Vin and as a voltage Vo after the output voltage Vo has risen, by means of a switch S5. Accordingly, once boosting action is started under the condition that the input DC voltage Vin is not less than the action voltage of the control circuit 13, even if the voltage Vin drops, the power voltage to the control circuit 13 is kept not less than the action voltage of the control circuit 13 because it has been switched already into the boosted output voltage Vo, thus this can perform normal boosting action. Moreover, the circuit can be simplified by also using the output of a hysteresis comparator 15, which feeds back the information on the voltage Vo to the control circuit 13 for stabilization of the output voltage, for switching of the switch S5.
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