Buck同步整流电路MOSFET损耗的计算

The Loss Calculation of the MOSFET in Synchronous Buck Circuit

在推导计算公式的基础上,对Buck同步整流电路中MOSFET管的损耗进行了细致的理论计算,并通过对CPU供电电路损耗的计算,验证了计算公式的正确性。虽然验证结果没有100%的吻合,但考虑实验条件及无法计算的因素,可以说结果还是可以接受的。

The synchronous buck circuit is in widespread use to provide high current ,low voltage power for CPU＇s, chipsets,peripherals etc.Typically,it is used to convert supply from a 12V or 5V,to an outputs as low as 0.7V for low voltage CPUs made in sub-micron technologies.The majority of the power losses in the conversion process is the losses in the power MOSFET switches.The profiles of loss for the high-side and low-side MOSFET are quite different.These low output voltage converters have low duty cycles, and the majority of the conduction loss concentrates in the low-side MOSFET. For the high side MOSFET,the loss is caused by the switches,named the switching loss.At the end of the thesis,we use the formulas and conclusion drawn before to calculate the loss of the CPU circuit on the server board,which will be compared to the test results in order to validate the correctness.