| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a power supply circuit, which not only allows quick demagnetization, but also prevents sudden changes in the rate of current change in a coil. <P>SOLUTION: A power supply circuit of the present invention comprises: a power supply line 2 which connects one end of a coil 1 to a power supply Bat and grounds the other end; a power supply switch 3 which is arranged in the middle of the power supply line 2 so as to selectively supply or cut off power to the coil 1; a demagnetization line 4 which is provided in parallel to the coil 1 and is connected to the power supply line 2; a demagnetization resistor 5 which is arranged in the middle of the demagnetization line 4; a diode 6 which is arranged in the middle of the demagnetization line 4 to be connected in series with the demagnetization resistor 5, and which sets a direction from the ground side to the coil 1 side as the forward direction; a bypass 7 which short-circuits both ends of the demagnetization resistor 5; and a bypass switch 8 which is arranged in the middle of the bypass 7 so as to open/close the bypass 7. <P>COPYRIGHT: (C)2012,JPO&INPIT |
