Calculate the number of LEDs from known power sources
Example: The rated output power is 10W power supply, using the rated forward current 20mA, how many LEDs can be configured under the condition of dissipating power of 70mW? According to the above formula (that is, the integer of the obtained data)
1: For constant voltage drive mode:
Calculate the number of LEDs in series and the number of parallel branches per branch from the known output supply voltage
(1) Calculate the number of LEDs per branch
(2) Calculate the number of parallel branches
Note: The VLED values ​​vary according to the different illuminating colors. When driving the LED with a regulated power supply, in order to control the current, a series resistor is usually required.
Example: A rated output voltage is DC24V, power is 10W power supply, rated forward current is 20mA, and the power dissipation is 70mW. The rated forward voltage is 1.8V. How many LEDs can be configured? (integer of the obtained data)
It can carry 10 groups of branches, 14 circuits of LEDs connected in series for each branch, a total of 140 LEDs.
2: For Constant Current drive mode
Calculate the number of parallel branches and the number of each branch from the known power output current and the current value of the LED
(1) Calculate the number of branches in parallel
(2) Calculate the number of LEDs connected in series:
Example: A rated output current is DC0.35A, rated power is 10W power supply, drive dissipated power is 70mW, forward current is 0.02A LED, how can it be configured?
Parallel count circuit:
(integer of the obtained data)
Number of connections per branch: number
That is, you can bring 17 groups, each group of 8 LEDs connected in series, a total of 136 LEDs.
Line loss and line voltage drop calculation
P wire = IRV wire = IR
R wire = σ (remark: L is the wire length; S is the wire cross-sectional area; σ is the wire conductivity) can also be found in the electrician manual.
Example: With a length of 10 meters (5 meters for each of the positive and negative wires), 24AWG copper core wire, the current is 2A, what is the power loss and line voltage drop?
Check the electrician manual to know: R wire = 0.3737W
V wire = 2 × 0.737 = 1.474V
P wire = 2 × 0.737 = 2.948W
It can be seen from the above calculations that when the line current is large, it is necessary to pay attention to selecting a suitable conductor cross section, otherwise the line loss and line voltage drop are quite large.
Only by fully understanding the basic characteristics of LED and LED power supplies can we properly design and use LED light sources.
Industrial Low High Bay Lighting Led Driver
Constant current LED driver, UL Dimmable Transformer, With global manufacturing standards and various certifications including CE, UL and FCC, our lighting products are sold in domestic market and are exported to various international markets including US, UK, France, Germany, Australia, Africa, Korea etc. We offer a wide range of Led Lighting Solutions which includes LED Linear Lighting or System, , LED Lams, LED High bay lights etc. Maximize beauty of your workplace with our beautiful Warehouse Lighting, Warehouse Lights Driver, Workshop Lighting, Supermarket Lighting and Factory lighting solutions.
Application: Specifically for high bay light, High Power Led Driver above 100W,normal for outdoor for waterproof, AC100-277V, 0-10V/PWM/RX dimming,short circuit protection,class 2 satety output design, passed the UL/FCC/TUV/RCM/CB/CE Certified. Europe and North America market.
Parameter:
Input voltage: 100-277vac
output voltage: 25-143vdc
current: 0.1A- 3.3A.
Power:108W
Power factor: >0.9
IP degree: IP65
Dimming:0-10V / PWM / RX / DALI.
>=50000hours, 5 years warranty.
certificate: UL CE FCC TUV SAA ect.
FAQ:
Question 1:Are you a factory or a trading company?
Answer: We are a factory.
Question 2: Payment term?
Answer: 30% TT deposit + 70% TT before shipment,50% TT deposit + 50% LC balance, Flexible payment
can be negotiated.
Question 3: What's the main business of Fahold?
Answer: Fahold focused on LED controllers and dimmers from 2010. We have 28 engineers who dedicated themselves to researching and developing LED controlling and dimming system.
Question 4: What Fahold will do if we have problems after receiving your products?
Answer: Our products have been strictly inspected before shipping. Once you receive the products you are not satisfied, please feel free to contact us in time, we will do our best to solve any of your problems with our good after-sale service.
Industrial Low High Bay Lighting Led Driver
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