I need to use some light dimer IC package with the suggested circuit which will be controlled by the wireless Light sensor using creating the mesh network for a smart street light system.
Any pieces of advice on this will be much help.
Ed WalkerTexas Instruments Online Support - Systems & Tools
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In reply to EdWalker:
Thanks a lot for your reply actually we want to use around 28 LED street lamps which are connected with every home in a row with 50 m Far distance from each other and We are connecting to the power supply individually as per mentioned below specifications
And major Point is we need to control the dimming of LED lamps as per the Wireless Light sensor data through single circuit
Also, at the same time we want to recharge the 24v DC battery used individually should get charged from the circuit (which should be connected with all the 24v Battery)
- After every 50% of consumption, the charging criteria will work automatically.
- The major issue is the wiring problem where I actually need the suggestion to avoid voltage drop in my circuit.
Any suggestions on this will be much useful.
In reply to Robson Jhon:
You cannot modify Ohm’s Law, so resistive drop will always be present.1. PoE, Power Over Ethernet, raised the working voltage above 48V to 57V so less current is drawn, thus less loss.
2. Streetlights could be on a timeshare basis where only a certain number at a time pull current from the 48V. Don’t try to charge them all at once.
3. One great option to help with long loop voltage drop is to go solar.
Here is a seminar paper on the subject. ( http://www.ti.com/ww/en/power_supply_design_seminars/index.html )
My vote here is the digital C2000 method, much more versatility.
Designing a Solar-Cell-Driven LED Outdoor Lighting SystemWhite Paper http://www.ti.com/lit/slup267Presentations http://www.ti.com/lit/slup260
A solar-powered LED light is an obvious application given the growing interest in “green” systems. This topic will use a medium-power solution to illustrate the many considerations of designing a complete system, including the unique demands of both the solar array and the LED lamps, and integrating these with a storage battery, charger, and control circuitry. Both analog and digital power-control solutions will be proposed and compared on the basis of functionality, complexity, and cost.
Reference design:Solar Street Light with Integrated MPPT Charger Reference Design
This design is a 12A Maximum Power Point Tracking (MPPT) solar charge controller with a 700mA LED driver. It is targeted for low power solar charger and LED driver solutions such as solar street lights. This design is capable of charging 12V batteries with up to 10A output current from 12V panels. However, it can be easily adapted to 24V systems by just changing the MOSFETs to 60V rated parts. Also, the design can drive up to 15 LEDs in series with 700mA of current. It is possible to adapt the design for LED currents up to 1.1A with minimum change in hardware. TI provides a complete solar inverting system for low power loads. Additionally this design takes real world considerations in to account, such as reverse battery protection, built-in battery charge profile for 12V Pb-acid batteries, and a highly efficient design. Together these provide new market entrants and faster time to market for their design.
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