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Performance characteristics of digital boundary current control sensor-less PFC converter

机译：数字边界电流控制无传感器PFC转换器的性能特性

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摘要

This paper presents a current sensor-less boundary current mode PFC converter. In particular, the ac-dc converter with a boundary current mode control has the following several advantages. One is that it has the capability to achieve the low input current distortion and the unity power factor can be obtained in theory. Another is that it is possible to reduce the switching loss because the inductor current is zero when the switch turns on. The conventional boundary current mode requires the detection of the inductor current using the detection resistor which causes power loss. In the proposed method, the zero-crossing point of the inductor current is predicted by solving the circuit equations. Therefore, it is unnecessary to detect the inductor current. It is able to eliminate the current detection resistor; it contributes the higher power efficiency. As a result, the proposed method operates under the boundary current mode in the steady state and the excellent power factor characteristics and lower total harmonic distortion are obtained without current detection.
机译：本文提出了一种无电流传感器的边界电流模式PFC转换器。尤其是，具有边界电流模式控制的AC-DC转换器具有以下几个优点。其一是它具有实现低输入电流失真的能力，并且在理论上可以获得单位功率因数。另一个是可以减少开关损耗，因为当开关导通时电感器电流为零。传统的边界电流模式要求使用导致功率损耗的检测电阻来检测电感器电流。在所提出的方法中，通过求解电路方程来预测电感器电流的过零点。因此，不需要检测电感器电流。能够消除电流检测电阻;它有助于提高功率效率。结果，所提出的方法在稳定状态下在边界电流模式下工作，并且无需电流检测即可获得优异的功率因数特性和较低的总谐波失真。

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