The Importance of PCB Design in LED Switching Power Supply
The advancement in LED switching power supply technology in recent years has led to a rapid pace of new product development. The final design stage, PCB design, is crucial as any issues in this phase can result in increased electromagnetic interference in the entire power supply system, impacting stability and safety.
Correct PCB Design Method
Research and market practice show that a correct circuit schematic is not enough if PCB design is flawed. Considerations like power supply and ground wire are essential to ensure product reliability and performance. Adopting the correct PCB design method is crucial for success.
Key Current Loops in PCB Design
- Input Signal Source Current Loop
- Power Switch AC Loop
- Output Rectifier AC Loop
- Output Load Current Loop
Proper connection of input and output loops is vital, directly impacting electromagnetic interference levels. Connecting these loops to filter capacitor terminals is crucial to prevent AC energy radiation. The design should prioritize routing AC loops before other traces.
Component Placement
In LED switching power supplies, the input and output loops consist of filter capacitors, power switches/rectifiers, and inductors/transformers. Placing these components close together with short current paths is essential. The layout should follow a structured approach: place transformer → design power switching current loop → design output rectifier current loop → connect control circuit → design input current source loop and input filter.
