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With the rapid development of science and technology products, PCB design of power supply is facing greater challenges, including power conversion efficiency, thermal analysis, power plane integrity and EMI (electromagnetic interference), etc.
With the development of high-frequency, high-frequency and high-frequency power supply, it is becoming more and more popular. At the same time, the packaging structure and dimensions of power supply products are also increasingly standardized to meet the requirements of the integrated market.
power PCB design
The first is power conversion efficiency. Conversion efficiency refers to the ratio of the output power of the power supply to the actual input power consumption. In practical application, electric energy can not be completely transformed, and there will be a certain amount of energy consumption in the middle. Therefore, no matter what kind of circuit, there must be efficiency problems in power conversion. For linear power supply, the heat dissipation of LDO should be considered; for switching power supply, the loss of switch tube should be considered.
Secondly, there is energy loss will inevitably produce heat, which involves the problem of heat dissipation. In addition, as the load becomes heavier, the power consumption of the power chip increases. Therefore, the thermal distribution in the power supply design has to be considered.
The other is the power plane integrity design. To maintain the integrity of the power supply is to keep the power supply stable. In practical systems, there are always noises with different frequencies. For example, PWM natural frequency or PFM variable frequency control signal, fast di / dt will produce current fluctuation signal, so a low impedance power plane design is necessary.
It's EMI. Switching power supply will produce switching noise when switching on and off continuously. If the loop inductance is not considered in the design process, too large return path will cause EMI problem.
The industry has been looking for ways to improve the success rate of Power PCB design. The experience of ipcb company shows that in the design process, if the possible risks can be predicted and avoided in advance, the success rate will be greatly improved. Therefore, it is very important to choose a suitable design simulation tool.
