What is the design principle and process flow of switching power supply?

The design and manufacturing of switching power supplies involve a complex and precise process, requiring adherence to a series of design principles and process flows to ensure stable performance and high reliability. Here is an outline of the basic principles and processes involved:

1. Requirement Analysis: Before designing a switching power supply, it’s essential to clearly define the product’s requirements and specifications. This includes output voltage, current, power, efficiency, size, weight, operating temperature range, etc.
2. Topology Selection: Based on the product requirements and performance specifications, select the appropriate switching power supply topology. Common topologies include single-ended buck, double-ended buck, boost, flyback, forward, etc.

1. Circuit Design: Design the switching power supply circuit according to the selected topology, including switch devices, transformers, inductors, filtering capacitors, control circuits, etc. Consider circuit stability, efficiency, electromagnetic compatibility (EMC), line losses, temperature rise, etc.
2. Component Selection: Choose suitable components, including switch devices, diodes, capacitors, inductors, transformers, control chips, etc., ensuring their parameters meet the design requirements and they have good performance and reliability.
3. PCB Design: Based on the circuit design and layout requirements, carry out PCB (Printed Circuit Board) design. Lay out the circuit reasonably to minimize wire lengths and current loops, improve electromagnetic compatibility, and consider heat dissipation and insulation.

Switching power supply Model Selector

1. Prototype Fabrication: Based on the PCB design, fabricate the prototype of the switching power supply, conduct circuit principle verification, and performance testing. Through prototype testing, validate the feasibility and stability of the design scheme.
2. Sample Testing: Manufacture samples of the switching power supply and conduct rigorous performance and reliability tests, including input-output characteristic tests, load regulation tests, efficiency tests, temperature tests, aging tests, etc.
3. Production Manufacturing: Based on the sample testing results, proceed with mass production. Strictly control the production process to ensure stable product quality that meets design requirements and standards.
4. Quality Control: Establish a comprehensive quality management system to monitor and manage the production process strictly, ensuring stable and reliable product quality.
5. After-sales Service: Provide comprehensive after-sales service and technical support, promptly address customer feedback, issues, and requirements, and continuously improve product performance and quality.

By following these design principles and process flows, switching power supplies can achieve stable performance, high efficiency, good electromagnetic compatibility, and reliable quality, meeting the needs of various application areas.