R_10018 Datasheet, PDF (6/10 Pages) NXP Semiconductors – Smart lighting A bright idea whose time has come

NXP Semiconductors
R_10018
Smart lighting: a bright idea whose time has come
Optional features:
• 110 V and 230 V
• Output power and standby power
• TRIAC compatibility
• Regional optimization of power factor
• ElectroMagnetic Interference (EMI) and harmonic regulation requirements
• Fast start-up time from mains power-on
• Open string protection (LED)
The circuitry in the GreenChip platform is small enough to fit inside a standard light bulb. It
can operate on the same wireless sensor network that may already be in place for energy
metering, smart appliances or security systems (see Figure 3).
R_10018
Report
Fig 3. NXP smart lighting module for 15 W SSL retrofit lamps
The advantage of a wireless system over a wired one is that it enables a simple, low cost,
and "aesthetically acceptable" installation, since there is no need for additional cabling.
Using wireless also makes the system more flexible and more scalable, since it is easy to
add new devices, such as lamps, switches or sensors.
3.1 Very low standby power
The lamps spend much of their time in standby mode, waiting for commands. Commands
can come from the user (for example, when someone toggles a wall switch or presses a
button on a remote control) or from the network (for instance, when an occupancy sensor
detects someone entering or exiting a room).
The large amount of time spent waiting means that standby power consumption can be a
serious issue. Consider an LED lamp that consumes 7 W of power when on and 0.5 W of
power when in standby mode. We assume that, within a 24-hour period, the lamp is on for
three hours and off, in standby mode, for 21 hours. In its on-state, the lamp consumes
21 watt-hours (7 W for 3 hours), and in its standby mode, it consumes 10.5 watt-hours
(0.5 W for 21 hours). The conclusion is that the standby mode adds roughly 50 % to the
lamp's daily energy usage, which is too much!
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 20 December 2011
© NXP B.V. 2011. All rights reserved.
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