Switching power supply for power supply and development equipment - Power supply circuit - Circuit diagram
Circuit principle: The switching power supply circuit is unilateral flyback type, and its core IC-U1 UC3844AN (8) is used as the pulse width controller (PWM). (Note that the drawing of the circuit diagram U1 uses the power and ground implied paintings in Protel. The method is that the {7} pin of U1 is connected to the power supply Vcc, and the {5} pin is grounded. When not oscillating, power is supplied to U1 through R9. When the self-oscillation is formed, the pulse of the {8} pin of T1 is rectified by D3 to supply power to U1. The {6} pin of U1 outputs pulse signals of different widths to control the power FET M1 switch. The sampling signal is taken from the photocoupler U2. Since the reference voltage comparator D5 is connected to the front end of the optocoupler, the output voltage is relatively stable, and the output voltage can be changed by fine-tuning the R14 to change the sampling voltage.
Component and circuit debugging: The component parameters are shown in the circuit diagram. Among them, the switching transformer T1: uses ER28×28 ferrite core, and its primary winding {6}～{7} is wound with 80∮ of 0.39mm enameled wire, winding {8}-{10} is wound around 8 turns with the same wire, and the secondary winding {1}~{5} is wound with 12 turns of ∮ ∮ 0.65mm enameled wire. Two to three layers of yellow wax cloth should be added between the primary and secondary to ensure good insulation. M1 needs to add heat sink, D1 is packaged in T0-220, and small heat sink should be added. The whole circuit is installed, and the T1's same name is correct. After power-on, the voltage can be output. T2 uses a magnetic ring of about 10mm, and is surrounded by high-strength enameled wire (or plastic AWG24~26 wire) for 4-6 turns. R9 is a PTC self-resetting fuse. It can be used for 5~10A or 250VAC. U2 is an optocoupler, but care should be taken that the pins should not be misconnected.
High Bay Light 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, 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: 100mA-8000mA.
Power factor: >0.9
IP degree: IP65
Dimming:0-10V / PWM / RX / DALI.
>=50000hours, 3-5 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.
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ShenZhen Fahold Electronic Limited , https://www.fahold.net