PROBLEM TO BE SOLVED: To obtain a power supply device capable of preventing generation of ground loop noise without forming a ground loop from, even in a configuration in which a load control unit for transmitting a control signal to a load device and a control power supply generation unit for supplying DC power supply to the load device and load control unit are installed so as to be apart from each other.SOLUTION: Switch means 8a, 8b, 8c which are normally open are provided between an output reference potential point of a first DC power supply circuit 4 for generating first DC power supply supplied to a load control unit 2 and an output reference potential point of second DC power supply circuits 5a, 5b, 5c for generating second DC power supply supplied to load devices 3a, 3b, 3c. The switch means 8a, 8b, 8c are controlled so as to be closed, when a state between both ends of the switch means 8a, 8b, 8c, or a state between the output reference potential point of the first DC power supply circuit 4 and the output reference potential point of the second DC power supply circuits 5a, 5b, 5c, is not conductive.

Power supply device

PURPOSE:To make it possible to control two kinds of independent switching route to adopt a free line constitution, by providing a line group selecting circuit and a switching control circuit which can transmit two kinds of switching command and returning command. CONSTITUTION:Signal 1 of switching command 0 and line group number 6 from switching control circuit 104 are transmitted to switching circuit 107, and #0 line control unit 101 is connected to MODEM 102''. Meanwhile, signal 3 of switching command 1 and non-line group number 7 from switching control circuit 104 are transmitted to switching circuit 106, and #0 line control unit 101 is connected to MODEM 102 and 102'. In the returning operation, returning operations reverse to switching operations can be performed by signal 2 of returning command 0 and line group number 6 and by signal 4 of returning command 1 and non-line group number 7.

Line switching unit

PURPOSE:To prevent deterioration of elements and malfunction of the unit and to improve economy, by making power feed control, in the electronic circuit package using the elements such as MOSIC.

Package power feed system

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Package power feed system