Super audio mode control circuit, switching converter and control circuit thereof

A mode control, super audio technology, applied in the direction of adjusting electrical variables, control/regulating systems, converting DC power input to DC power output, etc., can solve the problem of audio noise, and achieve the effect of maintaining stable and accurate output voltage.

Active Publication Date: 2017-05-24
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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  • Super audio mode control circuit, switching converter and control circuit thereof
  • Super audio mode control circuit, switching converter and control circuit thereof
  • Super audio mode control circuit, switching converter and control circuit thereof

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Embodiment Construction

[0049] The present invention is described below based on examples, but the present invention is not limited to these examples. In the following detailed description of the invention, some specific details are set forth in detail. The present invention can be fully understood by those skilled in the art without the description of these detailed parts. In order not to obscure the essence of the present invention, well-known methods, procedures, procedures, components and circuits have not been described in detail.

[0050] 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.

[0051] 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" another eleme...

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Abstract

A super audio mode control circuit and a switching converter using the same are disclosed. A rectifier switch of the switching converter is forced to be switched on according to a predetermined frequency in a low-load or no-load mode, and the on-time of the rectifier switch is controlled according to a compensation signal and the duty ratio of the switching converter. Thus, the switching converter does not produce audio noise in a low-load or no-load mode, and can work normally in a large parameter range. The on-time of the rectifier switch is continuously adjustable with the error signal and the duty ratio in a super audio mode. The accuracy and stability of output voltage at very wide duty ratio are ensured.

Description

technical field [0001] The present invention relates to power electronics technology, in particular to a super-audio mode control circuit, a switching converter and a control circuit thereof, wherein the control circuit is suitable for controlling the power of the switching converter in a light-load or no-load mode level circuit. Background technique [0002] Portable equipment has high requirements for efficiency at light loads. The switching converter of the synchronous buck topology (BUCK) will turn off the power tube when the inductor current crosses zero, thereby reducing the switching frequency of the power tube, reducing the switching loss of the power tube, and 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 dorman...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/158
CPCH02M3/158H02M3/1566
Inventor 李国旺
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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