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转(2) Desigh idea: What switching frequency to choose for a power supply? ? 如何选择频率

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eric.wentx
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  • 2012-8-22 20:56:58
转(2) Desigh idea: What switching frequency to choose for a power supply? ? 如何选择频率

What switching frequency to choose for a power supply?


  • It is assumed that the design will use some kind of "Soft Switching", and/or "Low Losses/Non Dissipative Snubbers". Today, for a new, competitive power supply design, just using "Hard Switching" is no longer an option.
  • We believe that choosing the switching frequency must be done at the beginning of a new design, taking in consideration: power level, cooling method, application specifics.

  • Power levels 0-50W: any switching frequency between 100kHz and 1MHz may be a good choice, depending of application.
  • Power levels 50W-500W: best choice would be between 200kHz and 500kHz. Use 200kHz for a higher efficiency and 500kHz for a higher density and easier filtering.
  • Power levels 500W-5kW: best choice would be between 100kHz and 200kHz. Use 100kHz for a higher efficiency; otherwise 200kHz is the best choice.
Choosing a much different switching frequency than those suggested above, may work for a while, but soon you will discover that your competitor has a product with a higher power density, or better efficiency. Do not find out too late that your power supply is not competitive.

大意:
假设基于软开关或是无损吸收之类的拓扑.
频率必须在电源设计开始就要考虑,同时考虑功率水平,冷却方式,应用环境等.
1. 0-50W, 依不同的应用方式,100K-1M的频率均是可行的.
2. 50W-500W,频率200K-500K, 200K可以得到更高的效率而500K可以实现更高的功率密度.
3. 500-5KW,频率100K-200K,100K可以得到更高的效率.
(以上来源早期网络)
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  • 2012-8-25 15:11:35
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