Some predictions about the national competition questions - about power supply questions

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Some predictions about the national competition questions - about power supply questions [Copy link]

The prediction is for reference only. Whether it makes sense or not, just take it as a reference.

power supply:

The charging and discharging power supply system is to first power the supercapacitor and then use it. Efficiency is very important. First charge the supercapacitor for a period of time, and also carry the load, then disconnect the power supply and measure the voltage. It can also be said that the source of acdc and dcdc is a superpower source, and the superpower source is regarded as a voltage source. But this year, inverter is the focus. In 2013, it was ACDC, in 2015, it was DCDC, and in 2017, it was microgrid inverter. Then there is another question, which is to design a 12V/220V inverter power supply circuit. Can you design this? Then you can add supercapacitors, input 12V, rated output 220V, give a rated power, and add some protection circuits, such as overvoltage protection, current limiting protection (varistor, etc.), where 220V is not necessarily 220V, it may also be 24V. You must pay attention to this question. Recently, someone should talk about inverter on the Internet. Listen carefully, it can be used. The third one is the contactless power supply system, and then add the load, efficiency becomes the key, and variable frequency power supply may also be designed, such as a sine wave variable frequency power supply. If this question is asked, we can refer to the wireless charging in last year's TI Electric, so that we can get started faster. The last one has to be said that there has never been a DC-AC question in the previous electrical competition. Design a DC/AC conversion power supply, input 15V DC, output single-phase effective value 5V sinusoidal AC, DC to AC conversion question type is also a good choice. The power supply question mainly looks at the efficiency, and the error must be within a certain range. In fact, the power supply itself is not difficult, the main thing is whether the efficiency can meet the requirements. Think about it, if the organizing committee asks you to achieve an efficiency of 98%, and you make it 90%, then it is basically 0 points. Sometimes it is useless to build a circuit roughly. Don't forget to add some protection circuits, such as overvoltage, current limiting, and adding capacitors. The use of various components, including inductors, etc. There are still many aspects that students who work on power supplies need to pay attention to.