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Switching converter, and controller and control method thereof

A switching converter and switch control technology, which is applied in the direction of control/regulation system, DC power input conversion to DC power output, instruments, etc., can solve the problem of power switch or other component damage, and achieve the effect of limitation

Pending Publication Date: 2022-08-09
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If a short circuit occurs, if the current flowing through the power switch or other components is greater than the maximum current limit it can withstand, the power switch or other components will be damaged

Method used

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  • Switching converter, and controller and control method thereof
  • Switching converter, and controller and control method thereof
  • Switching converter, and controller and control method thereof

Examples

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Embodiment Construction

[0018] The specific embodiments of the present invention will be described in detail below. It should be noted that the embodiments described herein are only used for illustration and are not used to limit the present invention. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one of ordinary skill in the art that these specific details need not be employed to practice the present invention. In other instances, well-known circuits, materials, or methods have not been described in detail in order to avoid obscuring the present invention.

[0019] Throughout this specification, references to "one embodiment," "an embodiment," "an example," or "an example" mean that a particular feature, structure, or characteristic described in connection with the embodiment or example is included in the present invention in at least one embodiment. Thus, appearances of ...

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PUM

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Abstract

The invention discloses a switching converter and a controller and a control method thereof. The controller comprises a comparison circuit, a valley value current limiting circuit, a peak value current limiting circuit, a conduction duration control circuit and a switch control circuit. The comparison circuit compares a feedback signal representing the output voltage with an output voltage reference value to generate a voltage comparison signal. A valley current limiting circuit compares a sampling signal representing a current flowing through the switching circuit with a first current threshold to generate a valley current comparison signal. The peak current limiting circuit generates an operation signal according to the valley current comparison signal and the switch control signal, and generates a peak current comparison signal according to comparison between the operation signal and a second current threshold. The switch control circuit generates a switch control signal according to the voltage comparison signal, the valley value current comparison signal, the peak value current comparison signal and the conduction duration control signal so as to control the on and off of the switch circuit.

Description

technical field [0001] The present invention relates to an electronic circuit, and more particularly, the present invention relates to a switching converter, its controller and control method. Background technique [0002] Switching converters are widely used in applications where the input voltage is converted into an output voltage to supply power to the load due to the advantages of high efficiency and large current carrying capacity. The switching converter includes at least one power switch, and the output voltage is obtained by controlling the opening and closing of the power switch. Switching converters include buck converters, boost converters, and flyback converters. [0003] In switching converters, it is usually necessary to sense the current in its output stage. If a short circuit condition occurs, if the current flowing through the power switch or other components is greater than the maximum current limit it can withstand, the power switch or other components ...

Claims

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Application Information

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IPC IPC(8): H02M1/08H02M1/00H02M3/158
CPCH02M1/08H02M1/0003H02M3/158Y02B70/10H02M1/0009H02M3/156
Inventor 胡望淼姜礼节张加欣周景海
Owner CHENGDU MONOLITHIC POWER SYST