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Switching converter, its current analog circuit, and current detection circuit and method

A technology of current detection circuit and switching converter, which is applied in the direction of measuring current/voltage, converting DC power input to DC power output, and only measuring current. It can solve problems such as low accuracy and affect detection accuracy, and achieve accurate representational effect

Active Publication Date: 2017-05-17
CHENGDU MONOLITHIC POWER SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the uncertainty of the parasitic resistance RI, the accuracy of this detection method is not high, and the capacitance of the capacitor 16 changes with the change of temperature, which will also cause the change of the detection voltage VS, affecting the detection accuracy

Method used

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  • Switching converter, its current analog circuit, and current detection circuit and method
  • Switching converter, its current analog circuit, and current detection circuit and method
  • Switching converter, its current analog circuit, and current detection circuit and method

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Embodiment Construction

[0023] Specific embodiments of the present invention will be described in detail below, and it should be noted that the embodiments described here are only for illustration, not for limiting 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 not to obscure the present invention. Throughout this specification, reference to "one embodiment," "an embodiment," "an example," or "example" means 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 the phrases "one embodiment," "...

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Abstract

The present invention proposes a current detection circuit applied to a switching converter, the switching converter includes a first switch and a second switch; the current sensing circuit senses the second switch current flowing through the second switch to generate a real-time current sensing signal; the current The analog circuit generates the first current according to the current sensing signal, and generates the second current according to the first current, and generates the current analog signal according to the first current and the second current; in the first stage, the current detection signal is proportional to the current analog signal, and in the In the second stage, the current detection signal is proportional to the current sensing signal.

Description

technical field [0001] The present invention mainly relates to electronic circuits, and more specifically, the present invention mainly relates to switching converters and their current simulation circuits and current detection circuits and methods. Background technique [0002] Due to the advantages of high efficiency and large current carrying capacity, switching converters are widely used in the occasions where the input voltage is converted into an output voltage to supply power to the load. The switching converter includes at least one power switch, and the output voltage is obtained by controlling the power switch to be turned on and off. Switching converters include buck converters, boost converters, and flyback converters. [0003] In switching converters, it is usually necessary to detect the current of its output stage. 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 w...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01R19/00H02M3/155
CPCH02M1/08H02M3/156G01R19/0092H02M1/0009
Inventor 詹姆斯·阮法兰西斯·余
Owner CHENGDU MONOLITHIC POWER SYST