"What do I need to have theoretical knowledge, practical skills and engineering qualities for DIY switching power supplies?"
“How do you design a switching power supply from a given design specification? What are the specific steps?â€
“How do you make your own inductors and transformers in your switching power supply? How do you choose the control chip?â€
“How to choose the core shape, inverter type, operating frequency, and calculate various parameters?â€
“How to optimize and compromise?â€
......
The power supply is the heart of all electronic devices. Without a power supply, electronic devices cannot work. Although there are many books on the market that introduce switching power supplies, there is still a lack of quick start and experience summary information, so despite the richness of information, there are still many people who do not know how to use them. Of course, this document is just an introduction. In-depth research depends on other monographs.
The alternating current obtained from the grid or the direct current obtained by the battery varies with ambient temperature, time and load, and they cannot directly become the internal power source required for the electronic device. Because electronic equipment has to perform many advanced functions, the accuracy of its power supply varies with the environment, dynamic response capability, and many other indicators have very high requirements. Converting the primary energy of the grid or battery into secondary energy that meets the requirements of electronic equipment, such a conversion device is the power source we are going to talk about here.
With the development of chip-shaped electronic components, surface mount technology and large-scale integrated circuits, electronic products are becoming more and more miniaturized and lighter. How to reduce the weight of the power supply, reduce the weight, improve the conversion efficiency of the power supply, and enhance the adaptability to the grid voltage. It is the focus of people's commitment to research.
A better solution is to replace the bulky power frequency transformer with a lightweight high-frequency transformer, and a DC-DC converter-type regulated power supply using pulse modulation technology, which is the switching power supply that we will talk about soon.
Switching power supply has the advantages of low tube consumption, high efficiency, wide voltage regulation range, small size and light weight. It is currently used in various electronic instruments and equipment, aerospace and spacecraft, transmitters, electronic computers, communication equipment and televisions. It has been widely used in video recorders and the like.
Switching power supplies can be divided into the following four categories according to the conversion method:
1, AC / DC switching power supply
2, DC / DC switching power supply
3, DC / AC inverter
4, AC / AC inverter
At present, only the first two types are called switching power supplies, and the latter two types are called inverters and inverters.
Switching power supplies can be divided into the following three categories according to the application method:
1, external power supply
A power module or power system that is placed separately from the device, such as:
---Communication primary power supply module and system
---Power operation power module and system
---Mobile phone battery charger
---Notebook Adapter
--- All kinds of portable devices, battery chargers for portable devices, etc.
2, built-in power
A power module or power system placed inside the device, such as:
---SilverBox and VRM inside the computer
---Power supply for internal appliances (such as: ordinary TV, plasma TV, LCD TV)
---Industry control equipment internal power supply
---The power supply used in the instrument
---Power modules and systems inside communication equipment
--- Internal power supply for copiers, fax machines, printers, etc.
3, on-board power supply
A power module placed on a board in the device, such as:
---Standard brick power supply (full brick, half brick, 1 / 4 brick, 1 / 8 brick)
---Non-isolated POL (Point of Load) converter
---VRM (Voltage regulator module voltage regulation module) and VRD (Voltage regulator down)
---Small power SMD power supply
---SIP and DIP power supply, etc.
The basic skills required to develop a switching power supply product:
1. Recognize all the components that make up the switching power supply.
2. Master the electrical performance and circuit symbols of various components
3, will make a variety of core components
4, will correctly assemble the various parts of the power supply
5. Understand the meaning of various indicators of power supply and master how to test
6, will use the instrument to correctly debug the power supply after assembly, optimization and compromise
7. Analyze the obtained experimental results and summarize them.
8, will continue to learn power knowledge from different channels and be able to communicate with others
Develop the theoretical knowledge required for a switching power supply product:
1. Topology analysis, control and design of active PFC
2. Topology and steady state analysis of DC/DC power converter
3. Power level parameter design of switching power supply
4. Control and dynamic analysis of switching power supply
5. Small signal analysis and design of switching power supply
6. Large signal analysis and design of switching power supply
7. EMI analysis and design of switching power supply
8. Thermal analysis and design of switching power supply
9. Tolerance analysis and design of switching power supply
10. Various protection technologies for switching power supplies
11. Synchronous rectification technology of switching power supply
12. Module current sharing control technology of switching power supply
Some technologies are very mature, as long as you look up the table or use off-the-shelf circuits or dedicated chips. EMI is difficult because component characteristics can change.
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