CONSTANT-VOLTAGE SUPPLY SYSTEM, ELECTRONIC APPARATUS, POWER SUPPLY UNIT, AND CONSTANT-VOLTAGE SUPPLY METHOD

摘要

PROBLEM TO BE SOLVED: To notify a power supply unit of fluctuations of a voltage supplied to an electronic apparatus without being affected by external noise, thereby supplying a stable voltage from the power supply unit to the electronic apparatus.SOLUTION: An alternating current of a frequency proportional to a voltage value of a voltage supplied to an electronic apparatus is transmitted to a power supply unit through a power supply line. The power supply unit regulates an output voltage on the basis of the value of the voltage proportional to the frequency of the alternating current.