| 摘要 |
<p>A system for providing protection for short circuits in a DC source 200 comprising a rectifying circuit 210, which may be a three phase or full wave rectifying circuit, coupled to an AC source to generate the DC output, a capacitor filter circuit 230 comprising at least one capacitor C1, C2, C3, C4, a short circuit detection circuit 240 which monitors at least one voltage across the filter circuit and is arranged to generate a signal dependent on the measured voltage, and a controller 260 to limit current through the capacitor filter circuit when the fault signal implies that a monitored voltage has fallen below a threshold value. The capacitor filter circuit may comprise a plurality of capacitor arrays, each comprising one or more capacitors in parallel. The DC source may include a soft start circuit 220 comprising a resistor R3 and switch S1 in parallel, which is controlled to limit the current into the circuit if a fault is detected. The short circuit detector may contain opto-couplers U1, U2.</p> |
