Patent ID: 11991802

Abstract:
An LED driver control circuit suitable for a LED driver operating under the Line Switch dimming protocol. The LED driver control circuit generates a control signal that can switch between a voltage level at a first node and a voltage level at a second node. The first node is connected to a three-phase input by a first voltage control circuit and the second node is connected to the three-phase input a second voltage control circuit. The first voltage control circuit controls the voltage level at the first node to be, in a first embodiment, greater than or, in a second embodiment, less than a voltage level of each phase of the 3-phase input for at least part of a cycle of the respective phase. The second voltage control circuit controls the voltage level at the second node to be, in the first embodiment, less than or equal to or, in the second embodiment, greater than or equal to a voltage level of each phase of the 3-phase input for the entirety of the cycle of the respective phase.