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Hybrid closed-loop/open-loop magnetic current sensor

A technology of current sensor and magnetic sensor, which is applied in the direction of voltage/current isolation, current only measurement, current/voltage measurement, etc., which can solve problems affecting cost and system complexity, power consumption, and high cost

Active Publication Date: 2015-02-11
TEXAS INSTR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, closed-loop current sensing is generally limited to the ability of the compensation coil driver circuit, and accommodating high sensed current ranges is expensive and consumes a significant amount of power
Therefore, closed loop techniques are not economical for some high current sensing applications, while open loop techniques may not provide the required level of current sensing accuracy at nominal or expected current levels
In addition, some current sensing applications require redundancy and / or self-test capability to ensure correct measurements, but the provision of two or more current sensors in parallel significantly impacts cost and system complexity and occupies a relatively small area in the host system. multi-space

Method used

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  • Hybrid closed-loop/open-loop magnetic current sensor
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  • Hybrid closed-loop/open-loop magnetic current sensor

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Embodiment Construction

[0020] One or more embodiments or implementations are described below with reference to the drawings, wherein like reference numerals are used to refer to like elements throughout and wherein the various features are not necessarily drawn to scale.

[0021] refer to Figure 1-3 , figure 1 is shown for measuring the primary current I flowing in the primary coil or conductor 4 magnetically interacting with the magnetic core 6 PRI An exemplary integrated closed-loop / open-loop current sensor device 2 . The conductor 4 may be magnetically interfaced with the core 6 in any suitable manner whereby the core structure 6 receives the current I in the conductor 4 PRI The magnetic influence of , and the conductor 4 can be as figure 1 A single electrical conductor passing through the core 6 is shown in , or there may be a winding with one or more turns around a portion of the core 6, or a current I flowing in the conductor 4 PRI Other suitable magnetic interaction configurations wher...

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Abstract

Hybrid magnetic current sensors and sensing apparatus are presented with closed-loop and open-loop circuitry employs first and second integrated magnetic sensors to sense a magnetic field in a magnetic core structure gap to provide high accuracy current measurement via a closed-loop magnetic circuit with the first sensor in a nominal current range as well as open-loop current measurement using the second sensor in an extended second range to accommodate over-current conditions in a host system as well as to provide redundant current sensing functionality.

Description

[0001] Related Application Cross Reference [0002] This application claims priority over U.S. Provisional Patent Application No. 61 / 863,294, filed August 7, 2013, and entitled "HYBRID CLOSED-LOOP / OPEN-LOOP MAGNETIC CURRENT SENSOR" right and interest, the entire contents of said provisional application are incorporated herein by reference. technical field [0003] The present invention relates to current sensors, and more particularly to closed loop non-contact current sensing systems. Background technique [0004] Contactless current sensing is used in a variety of applications to safely measure current, especially high current levels. Open-loop current sensing provides a cost-effective solution, where the magnetic field generated by the current passing through an electrical conductor is concentrated inside the magnetic core and a magnetic sensor measures the field and provides an output signal for estimating the current. The open-loop approach typically consumes little ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/00
CPCG01R19/00G01R33/07G01R15/20G01R15/185G01R19/0092
Inventor 马蒂杰·弗里杜斯·斯诺埃薇奥拉·谢弗
Owner TEXAS INSTR INC