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Buck converter and control method thereof

A step-down converter and control signal technology, which is applied in the circuit field, can solve problems such as complex gate drivers and circuit design difficulties, and achieve the effect of stable voltage control and smooth switching

Pending Publication Date: 2021-05-25
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This control mechanism of the flying capacitor involves complex gate driver, pre-charging circuit and monitoring circuit, which brings difficulties to the circuit design

Method used

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  • Buck converter and control method thereof
  • Buck converter and control method thereof
  • Buck converter and control method thereof

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Embodiment Construction

[0019] The following description is of the best contemplated mode of carrying out the invention. This description is made to illustrate the general principles of the invention and should not be considered in a limiting sense. The scope of the invention is determined by the appended claims.

[0020] The inventive concept is fully described hereinafter with reference to the accompanying drawings, in which exemplary embodiments of the inventive concept are shown. Advantages and features of the inventive concept and methods of achieving them will become apparent from the following exemplary embodiments, which will be described in more detail with reference to the accompanying drawings. It should be noted, however, that the inventive concept is not limited to the following exemplary embodiments, and may be implemented in various forms. Therefore, the exemplary embodiments are provided only to disclose the inventive concept and to let those skilled in the art know the category of ...

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Abstract

The invention discloses a buck converter which includes an output stage, a FCVB control circuit and a driver. The output stage includes a plurality of switches and a flying capacitor, wherein the switches are connected in series, the flying capacitor is coupled between two of the switches, and the output stage is configured to receive an input voltage to generate an output voltage. The FCVB control circuit is configured to compare a voltage of the flying capacitor with half of the input voltage to generate a comparison result, and the FCVB control circuit further responds to the comparison result to generate a first control signal and a second control signal based on a first PWM signal and a second PWM signal. The driver is configured to generate a plurality of diving signals according to the first control signal and the second control signal, wherein the driving signals are arranged to control the switches, respectively. The buck converter realizes smoother switching of the switch, and voltage controlling of the flying capacitor is more stable.

Description

technical field [0001] The invention relates to the field of circuit technology, in particular to a step-down converter and a control method thereof. Background technique [0002] Compared with ordinary buck converters, three-level or three-level (3-level) buck converters divide the input voltage by using flying capacitors, and three-level buck converters have Efficient conversion ratio and low switching loss. However, in order to maintain the performance of the three-level buck converter, the voltage of the flying capacitor should be controlled to be half of the input voltage (ie, the voltage difference between the two terminals of the flying capacitor is preferably half of the input voltage). This control mechanism of the flying capacitor includes complex gate driver, pre-charging circuit and monitoring circuit, which brings difficulties to the circuit design. Contents of the invention [0003] In view of this, the object of the present invention is to provide a step-d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/06H02M3/135H02M1/088
CPCH02M3/06H02M3/135H02M1/088H02M3/158H02M3/07H02M7/4833H02M7/4837H02M1/08
Inventor 曾俊彥洪浩评林志伟
Owner MEDIATEK INC