#The3rdLiChuangContest#240W high power density and high efficiency LLC power supply

1. Introduction of the work
For example, it may include but is not limited to the following:
1. The appearance of the whole machine or the PCBA picture after welding and assembly;
  2. The research background, purpose, function and market application prospects of the work;
     With the development of power supply technology, the design of power supply is gradually moving towards miniaturization, high power density and high efficiency; Originally, the products in this area were mainly
used in military and aerospace, and with the advancement and popularization of technology, they are gradually moving towards civilian products. The purpose of this design is to design a high-
density and efficiency power supply, which mainly adopts the PFC+LLC+SR architecture, and its current power is constant voltage output; facing the AC-DC field, its application occasions
are very wide, as long as the corresponding output voltage is changed, it can cope with most AC-DC power supplies on the market.
3. What are the highlights of the work in terms of innovation, fun, practicality and even public welfare?
   The main features of this design are reflected in small size, high power density and high efficiency; it has achieved 90-264Vac full voltage input, which
is suitable for voltage use in various regions around the world. ** It further reduces the size, reduces heat, and is convenient for carrying or installation; it also makes a little contribution to energy
saving .
2. System Architecture Diagram
Use a flowchart or mind map to describe the composition structure of your work, that is, the scheme diagram.
 1. Attach pictures or source files of the schematic diagram & PCB physical diagram (the official recommendation is to upload source files as much as possible). If it is a picture, please make sure that the picture is clear and legible;
   schematic diagram and PCB.
 2. Use text to roughly explain the implementation principle of the work and the working process of the system.
The mains input is EMI filtered and rectified, and then goes to PFC boost, using BOOST type APFC; 400V DC is output;
400V DC is converted by LLC topology power conversion to obtain the required AC voltage, and then through synchronous rectification, rectification and filtering; output sampling
, closed-loop feedback, control LLC converter, and output a stable DC voltage.
3. Indicate the name of the EDA tool software used and attach the design link.
    AD17 is used to draw the circuit diagram, and the seamless import of LiChuang EDA is realized.
Project file link: **https://lceda.cn/154600/240w-gao-gong-shuai-mi-du-gao-xiaollc-dian
4. Bill of Materials (BOM List)
List the main components (key components) used in your work, such as microcontrollers & ARM chips, application-specific integrated circuits (ASICs), sensors, functional modules, etc.
If the listed chip is from our LiChuang Mall, it is best to write the product number of the device or attach the corresponding purchase link.
U2-TEA19161 (NXP) -- Click NXP to learn more --
U1-TEA19162 (NXP) **
U3-TEA1995 (NXP)
BD1-KBL608 (C3079) ** -- Click the number to buy --
CK1-120uF 450V (C206153)
D1/D2-STTH3R06S (**C155619**)
Q1/Q3/Q4-TK380P60 (C150118)
Q2/Q5-BSC037N08NS5ATMA1 (C194555)
PH1-EL1019 (C79883)
U4-TL431 (C113312)
C7/C8-680uF 25V (C176310)
C9-330uF 25V（C160677）
CH3-47uF 35V（C99831）
CK2/CS2-47nF(473) ±5% 630VDC**（C178463）
DH1/DH2/DH3/DH4-UF4007-US1M（C142446）
D3/DG1/DG2/DG3-CD4148WSP（C53365）
TR2-NTC Thermistor/ 100KΩ（C92368）
RS2-R080（C76253）
TR1-NTC 5D-7（C5385）
VDR1-10D471K（C8760）
FS1-T2A/250V（C24687）
CX1-X2 Safety capacitor 470nF (C165728)
The key components of the power supply are listed above. For other components, please see the following attachments:
240W high power density and high efficiency LLC power supply BOM.pdf (Downloads: 425)  
5. Description of the software part (optional)
If your work involves software, please list the software workflow diagram corresponding to the work, as well as the routines and source code of the key parts (if you want to open source, please upload all the source code).
Pure hardware design, no software required.
6. Work Demonstration
Please upload the functional demonstration of your work to Tencent Video and edit it to this post (or attach a video link). Uploading a video as required will earn you 10 points. For details, please see the activity rules.
Video test link: [https://v.qq.com/x/page/s0761aly1ik.html**](https://v.qq.com/x/page/s0761aly1ik.html)
VII. Summary
, such as your experience in completing the work, the technical problems or debugging experience you encountered, the future plan of the work, and your suggestions and opinions for our organizers.
I remember that I bought the ticket on June 20th, the last bus for registration. Two months have passed in a blink of an eye. Because I am busy at work, I have been working on this power supply intermittently. I will do it when I have time, so it has been dragged on until now to be basically completed. At first, I saw a master making module power supplies in this area on the power supply website. I also like to tinker with power supplies, so I am ready to tinker with them. This power supply has two versions. The first version is based on UCC28019/L6599/TEA1995. Due to the high PFC standby power consumption, it was abandoned. The second version is the current version, based on NXP's TEA19161/TEA19162/TEA1995. This chip is a relatively popular current-mode LLC. Its standby power consumption can also be relatively low, and all aspects of protection are also complete.
In fact, the adjustment of the resonance parameters was anticipated at the beginning of the design. LLC power supply cannot be made perfect with calculated data. After comprehensive consideration, the series resonant inductor was decisively used for design, rather than the leakage inductance of the main transformer; mainly from the convenience of debugging, dispersing the heat of the main transformer, and reducing the volume of the main transformer. This avoids the tedious process of constantly disassembling the transformer during debugging; it also avoids the problem of transformer interference. At the beginning of debugging, it was not adjusted to the best working state (f=fr). There are also relevant explanations in the post. Friends who want to know can see the detailed explanation below; the day after tomorrow, by adjusting the transformer turns ratio and fine-tuning the input and output voltages, this problem was perfectly solved. The debugging of the power supply has been basically completed. The next step is to optimize the efficiency and equip a suitable shell for glue filling and heat dissipation. In this way, the module power supply is basically completed. The next step is to proof the magnetic components and conduct small-batch trial production. If there are no problems, it will be ready to be put on the market. I would like to thank all netizens for their opinions and suggestions, thank LiChuang for the platform and opportunities provided, and thank LiChuang staff for their hard work. I would like to say to you: You have worked hard! ! There is basically no opinion. The suggestion is that I hope this forum can be better in the future. The forum can be divided into sections and some netizens can be set as moderators (similar to the model of power supply network and 21 power supply network). In this way, the forum will be more dynamic.
For more project details, please see the link: http://club.szlcsc.com/article/details_34382_1.html
This project belongs to the Lichuang community "154600"