| 摘要 |
A power supply in accordance with the present invention includes: a resistance voltage-dividing circuit for generating an intermediate voltage, to which a targeted voltage value is allocated, from a supplied voltage; an N-type transistor which causes a current flow into from an outside when the intermediate voltage is higher than the targeted voltage value; a P-type transistor which outputs a current to the outside when the intermediate voltage is lower than the targeted voltage value; differential amplifier circuits having a voltage-follower arrangement, in each of the circuits the fluctuation acceptance range of the intermediate voltage with respect to the targeted voltage value being arranged so as to be equivalent to the difference between the operation-starting voltage of the N-type transistor and the operation-starting voltage of the P-type transistor; and resistances which activate either the P-type transistor or the N-type transistor so as to regulate the intermediate voltage by making the intermediate voltage approximately equal to the targeted voltage value. Thus, it is possible to provide driving electric powers with low power consumption and a stable output voltage, and the voltage fluctuation of the output voltage is promptly adjusted.
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