| 摘要 |
PROBLEM TO BE SOLVED: To provide an electrical power system capable of reducing the number of electromagnetic coils rather than that of switches.SOLUTION: Two switches 3a, 3b in three switches 3a to 3c are opened/closed by a first electromagnetic coil 5a, and an other switch 3c is opened/closed by a second electromagnetic coil 5b. Only one switch (a negative side main switch 3b) in two switches 3a, 3b becomes ON-state by applying a relatively low voltage to the first electromagnetic coil 5a, and both of two switches (a positive side main switch 3a and the negative main switch 3b) become ON-state by applying a high voltage being higher than the low voltage to it. |
