| 摘要 |
A direct-current power jack includes an insulative housing, a hole defined in a front face of the housing for insertion of a complementary power plug thereinto, a ground contact, a center contact, two switch contacts, two conductive contacts, and a joining member. When the plug is inserted into the power jack, the plug electrically connects firstly with the ground contact. The plug then electrically connects with the center contact. The plug then pushes the first switch contact to cause the first conductive contact to electrically connect with the joining member, and then pushes the second switch contact to cause the second conductive contact to electrically connect with the joining member. An electrical circuit electrically connecting with the power jack includes a ground circuit, a resistor, a capacitor and a load. The power jack prevents in-rush current sparking when it is engaged with the plug.
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