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BUCK Converter and frequency locking control circuit thereof

A control circuit and converter technology, which can be applied to conversion equipment without intermediate conversion to AC, DC power input is converted to DC power output, electrical components, etc., and can solve the problems of complex frequency-locking loop stability compensation of buck converters, etc. , to achieve the advantages of fast linear/load response, improve EMI characteristics, and solve the problem of switching frequency fluctuations

Active Publication Date: 2018-07-13
FUZHOU ROCKCHIP SEMICON
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a BUCK converter and its frequency-locking control circuit, which is used to solve the large frequency fluctuation or frequency-locking of the BUCK converter of the ACOT control architecture in the prior art. Loop Stability Compensation Complicated Issues

Method used

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  • BUCK Converter and frequency locking control circuit thereof
  • BUCK Converter and frequency locking control circuit thereof
  • BUCK Converter and frequency locking control circuit thereof

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Embodiment Construction

[0030] Embodiments of the present invention are described below through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific implementation modes, and various modifications or changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention. It should be noted that, in the case of no conflict, the following embodiments and features in the embodiments can be combined with each other.

[0031] see Figure 1 to Figure 4 It should be noted that the diagrams provided in the following embodiments are only schematically illustrating the basic ideas of the present invention, and only the components related to the present invention are shown in the diagrams rather than the number an...

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Abstract

The invention provides a BUCK converter and a frequency locking control circuit thereof. The frequency locking control circuit includes: a frequency-discriminating phase-discriminating logic circuit which generates first and second control logic signals having frequency error information according to a duty ratio signal of the BUCK converter and a frequency error signal of a reference signal; a charge pump connected with the frequency-discriminating phase-discriminating logic circuit and which controls on and off of fan-out current and fan-in current according to the first and second control logic signals and which outputs a voltage signal containing the frequency error information to an adaptive-on time generation circuit; a current source which generates the fan-out current and the fan-in current. The frequency locking control circuit is introduced herein such that the BUCK converter based on ACOT(adaptive continuous on time) structure enables the problem to be well solved that wide0input wide-output in actual application has switching frequency fluctuations, and EMI (electromagnetic interference) characteristic of a system is also greatly improved.

Description

technical field [0001] The invention belongs to the technical field of power electronics, in particular to a BUCK converter and a frequency-locking control circuit thereof. Background technique [0002] Buck converter, also known as step-down converter, is a single-tube non-isolated DC converter whose output voltage is lower than the input voltage. The BUCK converter with constant on-time (COT) control architecture, as an extension of the hysteretic control architecture, has a simple system structure and can achieve fast linear response and load response. However, for a wide range of input and output voltage requirements, constant on-time control will cause large frequency fluctuations when the BUCK converter operates in PWM mode, and the system EMI characteristics are poor. [0003] For the problem of frequency variation, the traditional approach is to generate an adaptive on-time (ACOT) that varies with the input and output voltage, use a current proportional to VIN to ch...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07H02M1/088H02M1/14
CPCH02M1/088H02M1/14H02M3/07H02M3/072
Inventor 吴晓辉胡如波
Owner FUZHOU ROCKCHIP SEMICON
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