Design of a multi-channel ultra-high efficiency LED driver (PCB schematic)
€30-250 EUR
着払い
I need a design of a multi-channel, ultra-high efficiency switching LED driver (Constant Current) with the following specs:
Topology: AC to DC (CC) single stage with PFC
Vin = 100 VAC to 240 VAC
Output quantity: 4
Vout = 24 V DC to 36V DC
Iout = 0.0 A to 1.4 A (per channel)
CC adjustable: yes, with analog or PWM control voltage
Overall Efficiency: >95% (at all working point with load I > 0.2A)
Power Factor: > 0.95
Size: < 100 mm x 40 mm x 20 mm
Component Cost: < $10 at 1000 pcs
I know, that specification are very difficult to reach and I'm available to discuss exceptions and tradeoffs.
Some hints for topology (not binding, just suggestions):
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Deliverables: a complete schematic with all components and calculated values.
Format: Altium Designer preferred, otherwise a pdf with schematic
Please evaluate well if you are able to do the job and please propose a budget.
UPDATE:
Over the weekend I did some more researches and found a new topology that might apply well to this job.
The topology is called SIMO (Single Inductor Multiple Outputs), where only one inductor is used, saving space and budget. Controlling is a little more difficult, but it is doable with a modern MCU.
Please read the following documents, that explain SIMO:
- https://ir.nctu.edu.tw/bitstream/11536/27787/1/000265092300008.pdf
- http://ims.unipv.it/~franco/ChapterBooks/10.pdf
- http://rincon-mora.gatech.edu/publicat/jrnls/tcasii09_simo.pdf
- http://www.jsts.org/html/journal/journal_files/2014/06/Year2014Volume14_03_05.pdf
So the new architecture will be a two stage:
1) a high efficiency AC to DC converter:
- Vin: 100 VAC to 240 VAC
- Outputs qty: 1
- Vout: 24-36V
- Efficiency: >95%
- Power factor: >0.95
- Power: 100W
This shouldn't be too difficult to achieve...
2) a SIMO DC-DC converter:
- Vin: 24-36V
- Output Qty: 4
- Vout: 24-36V
- Iout: 700mA (please note that I lowered this spec to make it easier)
- Efficiency: >95%
The second stage includes a MCU with PWM outputs that controls 2 FETs at the input and 4 at the outputs. Inductor is shared. By carefully chosing the components, it shouldn't be too difficult to stay in budget and efficiency. The main part is to write the MCU firmware to control the PWM.
Can you please update your offer to reflect this new topology?
Kind regards
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15人のフリーランサーが、平均€483 で、この仕事に入札しています。
Hello! Please contact me for discuss details. ============================== Best regards, Oleksandr
Hello! How are you?! I can help you right away with your project. Please look at my profile and send me a message! I have 6 years experience with pcb design and designed a lot of them including 3 versions of a LED driv もっと
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Hello, Have a great day. I am leading a team for developing Electronic circuits. We will deliver a complete PCB design. Please feel free to contact us. Best Regards, Shahbaz.
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you had mentioned 4 output ,I need to know wheather each channel has individual CC adjustment settings or common for all
Hello, I have many years design experience in various applications. I have designed, high voltage (>1500VDC), high-power (>300W), galvanically isolated designs, IP65, harsh environments, distributed controls and oth もっと
Very small chances to keep that small size for 50watts (per 1 channel!) driver, another bottleneck is unit price, imo it starts from ca 5 usd per channel .