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Basic design knowledge of DC-DC converter

wallpapers News 2021-04-29
DC-DC converter modules are widely used in consumer electronics, but how do they work and what are the most important criteria when choosing a converter product?
The origin of the DC-DC converter
When Allesandro Volta made batteries out of copper and zinc discs and cardboard soaked in saltwater, it was a novelty, but the low-power direct current (DC) had few practical applications. With a better understanding of electricity, it was discovered that rotating magnets could induce alternating current (AC) in wires, opening up the world of electricity generation. AC power is used for lighting, heating, and driving motors, and its voltage can be raised and lowered by using transformers.
And then DC started to get some use. Unlike AC, DC's charge can be stored in a battery or capacitor. For example, these stored charges were used to power the first telephones, and later telephone designs were designed to capture electricity over wires. If you want a specific DC voltage, you can connect the batteries in series. If you really need high-power DC, you can use a DC motion-generator set with the mechanical transmission in between, which can produce different voltages.
With the advent of new electronic products requiring different DC levels, such as the 150V vacuum tube, engineers began to consider how to convert DC voltage up and down. Thus the concept of DC-DC converter was born.
Today's DC-DC converters
Today's DC-DC converter applications fall into different categories: isolated and non-isolated, boost and buck, or both. Modules with specific power levels and functions are also available on the market, many of which have become general "commercial" components.
Let's first define what "isolated" means: If there is an electrical connection (usually ground) between the input and output, the part is non-isolated. The isolation unit has an internal transformer that magnetically transmits energy between the input and output so that the output can "float" relative to the input.
DC-DC converter indicators
When choosing a DC-DC converter, environmental considerations are usually the first consideration: is isolation required? What level, if any, of the security apparatus? What is the highest ambient temperature? Is there any airflow? The output rating is usually lowered at different operating temperatures. A 10W converter with no significant airflow may produce only 3W at a maximum temperature of 85 ° C.
Efficiency is always a key metric requirement and is related to operating temperature. Efficiency varies with load, which is also important because most users are running at less than 100 percent rating, where efficiency is likely to be much lower.
The impact of EMI varies with the type of the DC-DC converter. AC-DC converters have no legal limit on electromagnetic radiation levels, and additional external filters can be used. DC-DC converters, on the other hand, may not have much appeal if a small, low-cost converter requires a large, expensive filter to reduce noise to an acceptable level.
DC/DC converter supplier
Grasen Power Technologies Co.Ltd. is a professional electric vehicle (EV) charging station manufacturer for EV charging point and EV charging network provider. Grasen DC/DC converter is designed using cutting-edge hardware technology to be safe and reliable, while offering drivers a user-friendly, premium charging experience. Start your EV charging station businesses with Grasen. For a no-obligation quote latest price of DC/DC converter or technical support, please contact us and fill in your details, and we’ll get back to you within 24 hours.
 

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