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Full-time inductor current monitoring method by sensing low side switch

A technology of inductive current and sensing circuit, applied in the direction of voltage/current isolation, measuring current/voltage, high-efficiency power electronic conversion, etc., can solve the problems of high switching frequency, short on-time period, etc.

Active Publication Date: 2018-10-26
ALPHA & OMEGA SEMICON CAYMAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Sensing current information realistically in such systems is a challenge due to the high switching frequency, short on-time periods, and noise generated when the switches are turned on and off

Method used

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  • Full-time inductor current monitoring method by sensing low side switch
  • Full-time inductor current monitoring method by sensing low side switch
  • Full-time inductor current monitoring method by sensing low side switch

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Embodiment Construction

[0056] In the following descriptions, use or refer to signal-related variables such as V IN , V OUT i L . It should be noted that a large signal is a DC signal (or an AC signal at a point in time), one or more orders of magnitude larger than a small signal, and is used to analyze circuits containing nonlinear parts and calculate the operating point of these parts (bias). Large-signal DC quantities are denoted by capital letters with capital subscripts. Small semaphores are denoted by lowercase letters with lowercase subscripts. An example of a small signal is an AC signal superimposed on a circuit containing a large signal. Aggregates containing small and large semaphores are indicated in lowercase letters with uppercase subscripts.

[0057] introduction

[0058] As mentioned above, actual current monitoring is critical in systems operating in current mode since the system requires current information for power supply modulation. Various designs have been proposed fo...

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PUM

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Abstract

Aspects of the present disclosure describe a SMPS system, comprising a SMPS and an inductor current sensing device. The SMPS comprise a high-side (HS) switch and a low-side (LS) switch coupled in series and an output filter including an inductor and a capacitor coupled to a switch node formed by the HS and LS switches. An inductor current is supplied by the inductor to a load. The inductor currentsensing device coupled across the LS switch has a first input configured to receive a node signal indicating a voltage level at the switch node, a second input configured to receive an input voltageof the system and a third input configured to receive an output voltage of the system. The inductor current sensing device is configured to obtain a first constant DC slope information, a second constant DC slope information and a valley current information based on the first input, second and third inputs, and generate an output signal based on the first constant DC slope information, the secondconstant DC slope information and the valley current information. The output signal has a triangular waveform including a rising slope and a falling slope proportional to rising and falling slopes ofthe inductor current.

Description

technical field [0001] The present invention relates to integrated circuits, more specifically to current sensing devices used in Switch Mode Power Supplies (SMPS). Background technique [0002] Integrated circuits such as microprocessors and memory devices include multiple metal-oxide-semiconductor field-effect transistors (MOSFETs) that provide basic switching functions and are used to configure logic gates, data storage, power switches, and other devices. In one application, MOSFETs have been widely used in switch-mode power supplies (SMPS) due to their power efficiency and thermal efficiency. In addition to MOSFET switches, SMPS also include energy-saving devices such as inductors or capacitors. [0003] The power supply is a critical component in any electronic device, and its performance can affect power efficiency, production safety, and product performance. Therefore, it is imperative for a power supply to include a power monitoring system that monitors and / or modu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M1/00
CPCH02M1/0009H02M3/1588G01R31/40G01R19/16552G01R15/18Y02B70/10G01R19/003
Inventor 李承柱
Owner ALPHA & OMEGA SEMICON CAYMAN