Ultra-low power Bluetooth controlled, cost-effective, dimmable smart lighting solution
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The Internet of Things is growing rapidly. In its sub-segment, smart home and building automation applications, smart lighting plays a pivotal role in achieving energy saving and power saving, reducing electricity costs, and making people's lives more convenient. To design a competitive smart lighting solution, it is necessary to consider LED driving, communication, energy efficiency and other aspects. ON Semiconductor provides a smart lighting solution based on Bluetooth low energy, integrating the scalable power linear LED AC direct driver NCL30170, the industry's lowest power Bluetooth 5 system-on-chip (SoC) RSL10 and the high-voltage linear regulator NCP786A, eliminating the switching power supply (SMPS), the analog dimming range from 5% to 100%, the power factor (PF) of 0.99, the total harmonic distortion (THDi) of only 11% under full load conditions, and the standby power consumption of less than 200 mW, which helps designers to achieve ultra-low power Bluetooth controlled dimmable smart lighting solutions with high cost performance.
[ Figure 1: Bluetooth low energy smart lighting solution demonstration NCL30170 + RSL10 + NCP786A]
How to drive smart dimming?
An obvious advantage of the AC direct drive topology is that it eliminates the traditional switching power supply, reduces bill of materials (BoM) cost, reduces board space, improves EMI performance, and extends LED life.
ON Semiconductor's NCL30170 AC direct-drive LED driver integrates a high-voltage startup current source for fast startup and is used in smart lighting and phase-cut dimming applications. The controller manages the current of multiple LEDs in series and uses ON Semiconductor's proprietary auto-commutation topology to generate a smooth sinusoidal current, making the LED constant current accuracy reach ±1% and THD less than 10%, thereby ensuring that the LED brightness remains unchanged and providing an industry-leading power factor (0.99).
[Figure 2: NCL30170 achieves high-precision constant current]
[Figure 3: NCL30170 provides excellent PF and THD]
The NCL30170 is also the first product on the market capable of driving multiple external MOSFET switches to support the connection of multiple LED strings, with power scalable from 5 W to 300 W. The total number of connected LED strings and external switches is limited only by the highest power level.
The NCL30170 can achieve analog dimming from 5% to 100% and maintain voltage regulation throughout the dimming range, ensuring that the LED brightness remains constant even at low power. For phase-cut dimming using TRIAC, the NCL30170 can achieve good thyristor compatibility.
In addition, NCL30170 also integrates protection features such as input overvoltage protection, Rcs short-circuit protection, and thermal shutdown to ensure high reliability.
Control smart lighting with Bluetooth Low Energy
RSL10 is a Bluetooth 5 certified radio system-on-chip that supports Bluetooth low energy and 2.4 GHz proprietary/custom protocols, with a data rate of 2Mbps. It uses different packages to provide the industry's lowest Bluetooth power consumption for multi-field IoT applications, with a power consumption of only 62.5 nW in deep sleep mode and a peak reception power consumption of only 7 mW. Its high energy efficiency has been awarded the industry's highest EEMBC® ULPMark™ score, and supports a wide power supply voltage range of 1.1 V to 3.3 V. It uses 384 kB flash memory, a dual-core processor (ARM Cortex-M3 processor, 32-bit Dual-Harvard DSP system), and supports the CEVA Bluetooth stack. When there is no high-voltage power supply, the RSL10 has a connection interval of 50 ms, providing a fast response when interacting with the user, with a peak current of 8 mA and an average current of only 42 µA.
[Figure 4: RSL10 block diagram ]
Adjustable Output Buck Regulator
NCP786A is a high-performance high-voltage linear regulator with an input voltage range of 55 V to 450 VDC and an output current of 10 mA. The output voltage can be set by a resistor divider in the range of 1.27 V to 15 V. It is extremely suitable for high input voltage applications. It provides ultra-low quiescent current (typical value 10 µA), ultra-high power supply rejection ratio (PSRR: 70 dB@60 Hz, 90 dB@100 kHz), self-consumption does not exceed 25 µA, and the power consumption is only 8 mW, which is much lower than the commonly used switching power supply buck regulator.
Power consumption of RSL10 + NCP786A for dimming application
At 300 VDC input, we measured an average current of 38 µA for the RSL10+ NCP786A dimmer when unconnected and 57 µA to 67 µA when connected, dissipating only 22 mW.
[Figure 5: Dimmer power consumption – Vin 300 VDC]
Standby power consumption
The measured standby power consumption (NCL30170+RSL10) at 230 V AC input is about 140 mW to 150 mW, of which NCL30170 consumes about 125 mW. The standby power consumption of the whole solution is less than 200 mW.
Summarize
This Bluetooth low-power dimmable smart lighting solution adopts an innovative AC direct drive topology, which does not require a traditional SMPS. It has advantages in cost, size, service life and reliability, and can flexibly expand the power range as needed. It is based on ON Semiconductor's proprietary active constant power dimming control technology. The dimming range is from 5% to 100%, the power factor is 0.99, and the THDi at full power is only 11%. Even when dimming, the lighting brightness can be maintained uniformly. It integrates the industry's lowest power Bluetooth 5 SoC RSL10, providing advanced wireless functions without affecting the system size. The high-voltage linear regulator NCP786A provides ultra-high PSRR, improves the performance of wireless applications, and realizes high-performance, ultra-low power Bluetooth controlled dimmable smart lighting solutions with high cost performance.
ON Semiconductor will demonstrate this solution live at the 12th International Internet of Things Expo. You are welcome to visit the exhibition site to experience it in person.
The 12th International Internet of Things Expo
Time: July 30 to August 1, 2019
Location: Shenzhen Convention and Exhibition Center
Booth number: Hall 1, Booth 1A67
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