28 Pages
English
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Current Measurement Applications Handbook

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28 Pages
English

Description

Current Measurement Applications Handbook Contents Page No. Introduction 2 Chapter 1: Resistive DC current measurement 3 Chapter 2: Zetex ZXCT product description 9 Chapter 3: ZXCT application notes 10 Chapter 4: Magnetic AC and DC current measurement 20 Chapter 5: Zetex ZMC product description 24 Chapter 6: ZMC application notes 25 AN39 - 1 SEMICONDUCTORS ISSUE 4 - FEBRUARY 2004 Application Note 39

  • resistive dc

  • high-side measurement

  • inter-circuit offsets

  • current measurement

  • low- medium

  • page no

  • high yes


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Language English

Exrait

Application Note 39
Current Measurement Applications Handbook
Introduction
Contents
Chapter 1: Resistive DC current measurement
Chapter 2: Zetex ZXCT product description
Chapter 3: ZXCT application notes
Chapter 4: Magnetic AC and DC current measurement
Chapter 5: Zetex ZMC product description
Chapter 6: ZMC application notes
ISSU E 4 - FEBRUARY 2004
AN39 - 1
Page No.
2
3
9
10
20
24
25
S E M I C O N D U C T O R S
Application Note 39
Introduction Currentmeasurementwithinelectronic1)eElqeucitprmoneinctfounsedsi,sitnritbeurtneadlfpaoulwtelirmsiytisntegimns. circuitry is a common requirement in portable, handheld equipment, through to automotive 2) Auto shutdown functions for DC motor applications. This application handbook control (replacing slipping mechanical explores these factors for AC and DC current clutches). measurement and the implications on cost and performance for different approaches. BasicOpen loop systems application topologies are explored including typical example calculations for configuration.tienrrCuresueasmsomeeforrsysotheamedaddnallbvaiaesstllylusuatem,mie Basic application typescritical. 1) Current measurement in instrumentation Closed loop systems(bench power supplies, ammeters, current  probes).Current is measured and is modified to a reference value by some control element. ACresponsecanbecriticalhere.2)Pciorcwueirtryc,onesspuemcipatliloynpomrteaabsleurbeamtteenrty Examples include: powered consumer items. 1) Switching power supplies with current limiting functions or switch mode batteryohtesusddeaFtcrotsahdtteerminethetypeofm charging circuits. 2) PWM control of solenoids (automotiveMagnitude of current valve applications).The need for electrical isolation 3) RF transmit control loops in portableAccuracy cellular equipment, where transmitted power is adapted with distance.AC response 4) Control of bias currents in (RF) powerCost amplifiers.Summary matrix of methods and Current is compared to some preset valueerpmrofecna and is switched off if exceeded. Examples include: Figure 1 below shows the methods described in this handbook and a rough comparison between the most common factors found in current measuring application.
Figure 1 Matrix of common measurement methods
Type
Current Isolated range
Resistive V.low-high No Magnetic Med-v.high Yes rOepstisot-icvoeupledMed-highYes
S E M I C O N D U C T O R S
Accuracy AC response Non-intrusive Cost
-HighhMiegdhium Medium Medium Low- Low-medium medium
AN39 - 2
No Yes No
Low-medium
High Low-medium
ISSU E 4 - FEBRUARY 2004