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a buck converter

A technology of converters and capacitors, which is applied in the field of BUCK converters, can solve problems such as output voltage jitter, and achieve the effect of improving reliability

Active Publication Date: 2022-04-05
WEICHAI POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

That is, when the input voltage is greater than the set output voltage, but the voltage drop does not meet the requirements, it will cause the output voltage to jitter

Method used

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Embodiment Construction

[0054] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0055] In this application, the term "comprises", "comprises" or any other variation thereof is intended to cover a non-exclusive inclusion such that a process, method, article, or apparatus comprising a set of elements includes not only those elements, but also includes none. other elements specifically listed, or also include elements inherent in such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "com...

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Abstract

The present invention provides a BUCK converter. When the difference between the input voltage minus the output voltage of the main circuit of the BUCK converter is less than or equal to the first preset voltage and greater than zero, the collector provided on the switching tube is controlled by its auxiliary control circuit. The voltage difference across the energy storage capacitor between the charge pump and the charge pump is a first preset voltage, so as to maintain the output stability of the main circuit. That is, even if the voltage drop of the main circuit does not meet the conditions, as long as the input voltage is greater than the output voltage, the output of the main circuit can be guaranteed to be stable, which improves the reliability of the BUCK converter. Moreover, when the input voltage of the main circuit is less than or equal to the output voltage, the voltage difference between the two ends of the energy storage capacitor can also be controlled to a first preset voltage, so that the output voltage of the main circuit is equal to the input voltage.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a BUCK converter. Background technique [0002] Due to the advantages of stable output voltage and high efficiency, DC-DC converters are more and more widely used in the fields of computers, automation or electronic instruments. The BUCK converter is a common DC-DC converter, and the BUCK converter is also called a step-down converter, that is, the output voltage is always lower than the input voltage. [0003] In the prior art, the structural diagram of the BUCK converter is as follows figure 1 As shown, its working principle is: drive the charge pump through the PWM (Pulse Width Modulation) signal output by the auxiliary control circuit, and then control the on-off of the switch tube, and suppress the harmonics of the input voltage through the voltage dividing resistor and capacitor The component passes through, that is, the output voltage is the DC component of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156
CPCH02M3/156
Inventor 杨英振孙博王允铄宁璐平李相宜
Owner WEICHAI POWER CO LTD
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