High-power DALI
A digital addressable lighting interface (DALI) controlled device is arranged to communicate information according to a DALI protocol and powered by electrically coupling the controlled device to a DALI bus. The DALI bus is monitored for initiation of a DALI communication sequence. During a period of non-communication on the DALI bus, a high-current power supply is electrically coupled to the controlled device via the DALI bus. The high-current power supply provides a first high-current power signal to the controlled device. Upon detection of any DALI communication sequence on the DALI bus, the high-current power supply is electrically de-coupled from the controlled device for a determined time period. During the determined time period, a storage element is electrically coupled to the controlled device. The storage element provides a second high-current power signal to the controlled device.
1. A method to power a digital addressable lighting interface (DALI) controlled device, comprising:
electrically coupling the controlled device to a DALI bus, the controlled device arranged to communicate information according to a DALI protocol;
monitoring the DALI bus for initiation of a DALI communication sequence;
during a period of non-communication on the DALI bus, electrically coupling a high-current power supply to the controlled device via the DALI bus, the high-current power supply arranged to provide a first high-current power signal to the controlled device;
upon detection of any DALI communication sequence on the DALI bus, electrically de-coupling the high-current power supply from the controlled device for a determined time period; and
during the determined time period, electrically coupling a storage element to the controlled device, the storage element arranged to provide a second high-current power signal to the controlled device.
2. The method of claim 1 , wherein the determined time period is at least five (5) seconds.
3. The method of claim 1 , wherein the determined time period is less than thirty (30) seconds.
4. The method of claim 1 , wherein the determined time period is based on a detection of non-communication on the DALI bus.
5. The method of claim 1 , wherein the controlled device is an environmental sensor.
6. The method of claim 1 , wherein the high-current signal is a signal that exceeds two hundred fifty milliamps (250 mA).
7. The method of claim 1 , wherein the high-current signal is a signal that exceeds five hundred milliamps (500 mA).
8. The method of claim 1 , wherein an input source voltage on the DALI bus has a first voltage, and an output source voltage of the high-current signal has a second voltage, the second voltage being less than the first voltage.
9. The method of claim 1 , further comprising:
charging the storage element via a low-current signal present on the DALI bus during the period of non-communication on the DALI bus.
10. The method of claim 9 , wherein the low-current signal present on the DALI bus during the period of non-communication on the DALI bus is a signal that does not exceed two hundred fifty milliamps (250 mA).
11. A system, comprising:
a smart lighting device having a digital addressable lighting interface (DALI) controller; and
a controlled device electrically coupled to the smart lighting device via a DALI bus, wherein the controlled device is arranged to receive a first high-current signal from a DC-DC power supply that is electrically coupled to the DALI bus during a non-communication period on the DALI bus, and wherein the controlled device is arranged to receive a second high-current signal from a storage element that is electrically de-coupled from the DALI bus during a communication period on the DALI bus.
12. The system of claim 11 , wherein the controlled device is an environmental sensor device.
13. The system of claim 11 , wherein the first- and second-high current signals exceed, at least some of the time, two hundred fifty milliamps (250 mA).
14. The system of claim 11 , wherein the smart lighting device is electromechanically coupled to a streetlight.
15. The system of claim 11 , wherein the controlled device is further arranged to charge the storage element via current drawn from the DALI bus during the non-communication period.