Drive Power Supply For Mechanical Switch, Power Supply Device, And Method For Diagnosing Degradation

Abstract: A mechanical switch (4) includes a mechanical contact (40) and coils (42, 44) that open and close the mechanical contact (40) by receiving supply of drive currents from a drive power supply (30). The drive power supply (30) comprises capacitors (C1, C2) and switches (320, 340) connected between the capacitors (C1, C2) and the coils (42, 44), respectively. The switches (320, 340) is temporarily turned on to turn on/off the mechanical switch (4) to supply the drive currents from the capacitors (C1, C2) to the coils (42, 44), respectively. The drive power supply (30) further comprises a charge circuit (36) that charges the capacitors (C1, C2) during an off-period of the switches (320, 340), detection circuits (52, 54) that detect the charge currents and voltages of the capacitors (C1, C2), respectively, and a diagnosis circuit (58) that diagnoses a deterioration state of each of the capacitors (C1, C2) from the detected charge current and voltage.

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