High-end trim control of lighting fixtures

摘要

A device and system for controlling a light source. The device has a positive terminal and a negative terminal for setting the high-end trim of a light source, the device includes several zener diodes each having a different zener voltage; and a selector having a plurality of positions, positioning the selector in each of the plurality of positions couples a corresponding one of the zener diodes between the positive terminal and the negative terminal. The cathode of the selected zener diode is coupled to the positive terminal and the anode of the selected zener diode is coupled to the negative terminal. The selected zener diode limits the voltage across the positive terminal and the negative terminal to set the high-end trim of a 0-10 volt lighting control signal.

主权项

1. An apparatus for controlling a light source, the apparatus comprising:
a driver having a control channel, the driver powers the light source based on a first voltage across the control channel; a plurality of zener diodes each having a corresponding zener voltage; a selector is configured to select a selected one of the plurality of zener diodes across the control channel such that the voltage across the control channel is limited by the selected zener diode, the control channel having a positive terminal and a negative terminal, the selected zener diode having an anode and a cathode, the cathode of the selected zener diode being coupled to the positive terminal and the anode of the selected zener diode being coupled to the negative terminal; and a variable resistor across the control channel.