| 摘要 |
<p>The filter (1) has an X-capacitor (CX) connected between phase and neutral lines (Ph, N) and a discharge resistor provided for discharging the X-capacitor. The discharge resistor is arranged in series with switching elements (Q1, Q2) e.g. p-channel MOSFETs. The switching elements are closed by the discharge resistor for discharging the X-capacitor during detection of network separation by a detector circuit (2). The detector circuit has a low pass filter for detection of alternating voltage of a power supply network. A rise in voltage in the X-capacitor is limited by diodes (D1, D3).</p> |
