A non-isolated driver for led lighting
AssigneeSignify Holding B.V.
InventorsGuangyi LUO, Liang SHI, Kang LI, Gang WANG, Zhenyi ZHENG, Bo CAI, Lei ZHOU
Life of this patent
Estimating the term…
Abstract
A non-isolated LED driver has a converter which delivers first and second outputs. A sense circuit is coupled to both the first output and the second output, between the converter and an LED unit. The currents at the first output and the second output are compared to obtain a difference therebetween, and a leakage fault is determined based on an alternating current component of the difference. This avoids the need for an isolated driver, by instead detecting a leakage fault and then taking appropriate safety actions.
Claims15
A non-isolated drive for a LED lighting unit, comprising:
- a non-isolated converter with an input to be connected to a power supply, a converting circuit to convert power from the power supply, and an output arrangement to be connected to the LED lighting unit, wherein said output arrangement comprises a first output for delivering current and a second output for receiving returned current, wherein the output of the non-isolated drive is coupled to the power supply electrically without an electrical isolator;
- a sense circuit coupled to both the first output and the second output;
- a comparing circuit to compare currents at the first output and the second output and obtain a difference therebetween;
- and
- a controller adapted to determine whether there is a ground fault according to whether an alternating current component of the difference is detected.
Dependencies are inferred from the claim text.