This paper describes a design of power supply on the wide range of input voltage for ship's refer-container remote monitoring system(RRMS). Refer-Container manager checked its conditions, like the temperature, humidity & etc. But the refer-container makers didn't using their individualized communication protocol, the manager used several terminal that made by each maker. When the container-ship is at sea, refer-container managers are attended with danger that occurred by weather.
Because these problems, refer-container makers applied Power Line Communication(PLC) to their productions but it shows low rate. So the manager still checks refer-container individually.
RRMS use RF communication and individualized protocol that make communication with most makers refer-container.
RRMS used in container ship's deck, generally, power source on the deck has wide voltage range of 110[V] ~ 440[V. So the power supply of RRMS must have 110[V] ~ 440[V] voltage coverage and as small as it could be installed in the slave terminal.
In operating test the RRMS, some loading place had unstable voltage, up to 470[V], and the power supply was broken. So the power supply demand its voltage range up to 470[V].
This paper proposes a design of very small size buck-converter with 110[V] ~ 470[V] voltage range, and it could be installed the slave modem of RRMS.