| 摘要 |
<p>The invention relates to a circuit (25) for providing a freewheeling current to a coil (17) of an electromagnetic switching device, wherein the circuit (25) comprises a freewheeling diode (27) connectable in parallel to the coil (17) in a reverse direction with respect to a polarity of a dc supply source (20) supplying electrical power to the coil (17), and a switch (30) connected in parallel to the freewheeling diode (27), wherein the switch (30) is controllable responsive to a voltage across the freewheeling diode (27).</p> |
