Short Circuit Protection

摘要

A method and apparatus are provided for short circuit protection in a DC current source. A rectifying circuit arranged to generate a DC output can coupled to an AC source and a capacitor filter circuit can be provided to smooth the DC output. A short circuit detection unit can also be provided for monitoring at least one voltage across the capacitor filter circuit and generating a fault signal. A controller can then limit current through the capacitor filter circuit when the fault signal implies that the monitored voltage has fallen below a threshold value.

主权项

1. A direct current source, comprising:
a rectifying circuit coupled to an AC supply, the rectifying circuit being arranged to generate a DC output; a capacitor filter circuit for smoothing the DC output of the rectifier circuit, the capacitor filter circuit comprising at least one capacitor; a short circuit detection unit for monitoring at least one voltage across the capacitor filter circuit, the short circuit detection unit being arranged to generate a fault signal in dependence on the monitored voltage; and a controller for limiting current through the capacitor filter circuit when the fault signal implies that a monitored voltage has fallen below a threshold value.