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LED switching power supply PCB design how to do it is correct?

LED switching power supply PCB design how to do it is correct?

LED switching power supply R & D speed in recent years has been a significant leap in technology, new product replacement speed also accelerated a lot. As a last design link, LED PCB design is also particularly important, because once in this part of the problem, it is likely that the entire LED switching power supply system to produce more electromagnetic interference, the stability of the power supply and security Will also cause adverse effects. So, what is the design of the PCB is correct?

Through the recent years, LED power supply components layout research and market practice results show that even in the early stages of the design of the circuit schematic is very correct, but once the PCB design problems, but also the reliability of electronic equipment adverse Impact, such as due to power, ground considerations are not thoughtful interference caused by the performance of the product will decline, so the design of the PCB board, you need to use the correct method.

In a switch power supply commonly used in the PCB board, usually every switching power supply has four current loop, they are the input signal source current loop, power switch AC circuit, the output rectifier AC circuit, the output load current loop. The input circuit charges the input capacitor through an approximately DC current, and the filter capacitor acts primarily as a broadband energy storage. Similarly, the output filter capacitor is also used to store the high frequency energy from the output rectifier while eliminating the DC energy of the output load loop. Therefore, it is important to input and output the filter capacitor terminals. The input and output current circuits should be connected to the power supply only from the terminals of the filter capacitor.

Input and output circuit settings and connections for the entire printed circuit board, it is very important, its reasonable or not directly related to the size of electromagnetic interference. If the connection between the rectifier circuit and the power switch can not be directly connected to the terminal of the capacitor, the AC energy will be filtered by the input or output capacitor and radiated into the environment. Power switch AC circuit and rectifier AC circuit contains high trapezoidal current, these currents in the harmonic component is very high, the frequency is much larger than the switching base frequency, the peak amplitude can be as long as the continuous input and output DC current amplitude of 5 times the transition time is usually About 50ns. These two circuits are the most prone to electromagnetic interference, so these wiring circuits must be laid out before the other wiring lines in the power supply.

In the LED switching power PCB supply input and input circuit, each circuit is composed of three main components, these three components are filter capacitors, power switches or rectifiers, inductors or transformers. These three important elements should be placed adjacent to each other, adjusting the position of the elements so that the current path between them is as short as possible. The best way to build a switching power supply layout is similar to its electrical design. The best design flow is as follows: Place the transformer → Design the power switch Current loop → Design the output rectifier Current loop → Connect the control circuit to the AC power supply circuit → Design the input current source circuit and input filter.


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