| 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: An electrical power system 1 comprises: a positive side main switch 3a; a negative side main switch 3b; a pre-charge resistor 4; a pre-charge switch 3c; a first electromagnetic coil 5a; a second electromagnetic coil 5b; and a control circuit part 6. When electric current is supplied to only the first electromagnetic coil 5a in two electromagnetic coils 5a, 5b, the negative side main switch 3b and the pre-charge switch 3c become ON-states. In addition, electric current is supplied to the second electromagnetic coil 5b, the positive side main switch 3a becomes ON-state. Then when supply of the electric current to the first electromagnetic coil 5a is stopped, the pre-charge switch 3c becomes OFF-state while two main switches 3a, 3b are kept ON-states by magnetic force generated from the second electromagnetic coil 5b. |
