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DCR current sampling circuit and method and related control circuit

A technology of current sampling and sampling capacitance, which is applied in the direction of control/regulation system, electrical components, and adjustment of electrical variables, etc., which can solve the problems of system stability and dynamic response speed.

Active Publication Date: 2021-07-23
CHENGDU MONOLITHIC POWER SYST
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some high-performance CPU applications using multi-phase switching converters, it is necessary to quickly and accurately report the dynamic current situation, and it is also necessary to take into account the stability of the system. Both the stability of the system and the dynamic response speed must meet strict standards, so it costs More time to compensate and adjust the time constant of the DCR current sampling circuit of each phase circuit, but it is often difficult to balance the stability and dynamic response speed of the system

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  • DCR current sampling circuit and method and related control circuit
  • DCR current sampling circuit and method and related control circuit
  • DCR current sampling circuit and method and related control circuit

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Embodiment Construction

[0021] 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 to avoid obscuring the present invention.

[0022] 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 "in on...

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Abstract

The invention discloses a DCR current sampling circuit and method for a switching converter and a related control circuit. The DCR current sampling circuit converts voltage signals at the two ends of a sampling capacitor into current sampling signals, and mirrors the current sampling signals to generate first mirrored current signals and second mirrored current signals. Meanwhile, the DCR current sampling circuit further comprises a first compensation circuit and a second compensation circuit. The first compensation circuit carries out compensation adjustment on the first mirror current signals according to the dynamic response speed of a switching converter; and the second compensation circuit carries out compensation adjustment on the second mirror current signals according to the stability of the switching converter.

Description

technical field [0001] The present invention relates to electronic circuits, in particular to switching converters and inductor DC resistance (Direct Current Resistance, DCR) current sampling circuits and methods. Background technique [0002] DCR current sampling is a commonly used current sampling method in switching converters. The principle of DCR current sampling is as follows: figure 1 shown. exist figure 1 , the DCR current sampling circuit includes a sampling resistor R S and sampling capacitor C S . where the sampling resistor R S and sampling capacitor C S After being connected in series, it is connected in parallel with the inductor L, wherein the DC resistance of the inductor L is also connected with a DC resistance R connected in series with the inductor L L shown in the form. When the inductor L and the sampling resistor R S and sampling capacitor C S When the time constants of the branches are perfectly matched, the sampling capacitor C S The volta...

Claims

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Application Information

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IPC IPC(8): H02M1/00G01R19/25H02M3/158
CPCH02M1/00G01R19/25H02M3/158H02M1/0009H02M3/1584
Inventor 黄俊狮萧佳峻
Owner CHENGDU MONOLITHIC POWER SYST
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