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Control circuit and switching converter using it

A switching converter and control circuit technology, applied in the direction of adjusting electrical variables, control/regulating systems, output power conversion devices, etc. Effects of Voltage Adaptive Applications

Active Publication Date: 2022-04-29
SILERGY SEMICON TECH (HANGZHOU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Usually the minimum on-time t ON_MAX is less than the period Ts of the fixed frequency, so the minimum and maximum conversion ratios of the existing technical solutions increase with the fixed f S limited by the heightened

Method used

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  • Control circuit and switching converter using it
  • Control circuit and switching converter using it
  • Control circuit and switching converter using it

Examples

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Embodiment Construction

[0040] 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.

[0041] 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.

[0042] 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

The application discloses a control circuit and a switching converter using the same. The technical solutions of the embodiments of the present invention can dynamically adjust the cut-off time of the switching cycle in response to changes in output power to change the length of the switching cycle, so that when the conversion ratio is large or small, the operating frequency of the switch is automatically reduced to widen the conversion ratio range, enabling switching converters to achieve wide input voltage and wide output voltage adaptive applications.

Description

technical field [0001] The invention relates to power electronics technology, in particular to a switch converter and its control circuit. Background technique [0002] A switching converter is a power conversion circuit that can convert an input voltage into another fixed output signal or an adjustable output signal through different forms of architecture, so it is widely used in electronic products such as mobile devices. Constant off-time (CFT) control technology is a pulse frequency modulation (PFM) control technology, which regulates the output voltage by controlling the power transistor of the switching converter to turn off for a fixed time in each switching cycle. [0003] In the prior art, the IR LED driver used for security monitoring usually has a wide input voltage range and a wide output voltage range, so an adaptive control scheme with a wide conversion ratio of the switching converter has very strong application requirements . The commonly used technical sch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/156
CPCH02M3/156
Inventor 许小强王建新许火明
Owner SILERGY SEMICON TECH (HANGZHOU) CO LTD
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