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Control method, controller and switching converter

A technology of switching converters and control methods, applied in control/regulation systems, conversion of DC power input to DC power output, instruments, etc., can solve problems such as the generation of audio noise, avoid audio noise, improve efficiency, and ensure stability. Effect

Active Publication Date: 2018-11-16
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem is that in light load or no load mode, if the switching frequency is lower than 20kHz, there will be audible noise, which is not acceptable for portable equipment

Method used

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  • Control method, controller and switching converter
  • Control method, controller and switching converter
  • Control method, controller and switching converter

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Embodiment Construction

[0057] The present application is described below based on examples, but the present application is not limited only to these examples. In the following detailed description of the application, some specific details are set forth in detail. The present application can be fully understood by those skilled in the art without the description of these detailed parts. To avoid obscuring the essence of the present application, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0058] Additionally, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.

[0059] Meanwhile, it should be understood that in the following description, "circuit" refers to a conductive loop formed by at least one element or sub-circuit through electrical connection or electromagnetic connection. When an element or circuit is said to be "connected to" ano...

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Abstract

The invention discloses a control method, a controller and a switching converter. By controlling a rectifier switch to be on for first time and then, triggering a power switch to be on for second timein each switching period under a superaudio mode, and adjusting the first time according to a regulation signal corresponding to the output voltage to enable the switching period of the switching converter to be kept in a set period, the switching converter can be prevented from having audio noise under the superaudio mode, and meanwhile, stability of the system is enhanced, and efficiency of thesystem is improved.

Description

technical field [0001] The present invention relates to power electronics technology, and more specifically, to a control method, a controller and a switching converter. Background technique [0002] Portable devices have high requirements for efficiency in light-load mode. Buck switching converters usually turn off the power switch when the inductor current crosses zero, thereby reducing the switching frequency of the power switch and reducing the power consumption. The switching loss of the switch, thereby improving the efficiency of the entire circuit system. The problem is that in light-load or no-load mode, if the switching frequency is lower than 20kHz, it will generate audible noise, which is unacceptable for portable equipment. In order to avoid audio noise while improving light-load efficiency, a super-audio mode between the traditional light-load high-efficiency mode and forced continuous mode is usually designed. The super audio mode refers to the working mode i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
CPCH02M3/1584Y02B70/10
Inventor 李国旺
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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