TCM mode control method based on switched capacitor hybrid buck converter

Abstract

This invention relates to a TCM mode control method based on a switched-capacitor hybrid Buck converter, primarily applicable to applications requiring high efficiency and power density, such as data centers or electric vehicles. The converter includes a main power circuit and a control circuit. The control circuit comprises a current sampling circuit, a voltage sampling circuit, a voltage regulator, a current regulator, a start-up control circuit, a frequency limiting circuit, and a drive circuit. The main principle of the TCM mode control method based on the switched-capacitor hybrid Buck converter is as follows: Peak-to-peak current closed-loop control is employed, sampling both the output voltage and the current flowing through the inductor. When the converter is operating at a high frequency, it is kept at a fixed frequency; when the converter is operating at a relatively low frequency, it is kept at a variable frequency. This control method not only enables all switches to achieve zero-voltage switching (ZVS) across the entire frequency range and reduces the frequency variation range, but also exhibits excellent dynamic performance.

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