Philips KMZ52 Manuals

Manuals and User Guides for Philips KMZ52. We have 2 Philips KMZ52 manuals available for free PDF download: Application Note, General Manual

Philips KMZ52 Application Note (38 pages)

Electronic Compass Design

Brand: Philips | Category: Accessories | Size: 0.3 MB

Table of Contents
5
Introduction
7
Earth´s Magnetic Field
8
Figure 1 Earth´s Magnetic Field
8
Figure 2 Earth Field Vector
9
Building Blocks of an Electronic Compass
10
Figure 3 Functional Block Diagram of an Electronic Compass
10
Magnetoresistive (Mr) Sensors for Compass Applications
12
The Magnetoresistive Sensor Element
12
The Magnetoresistive Effect
12
Figure 4 the Magnetoresistive Effect in Permalloy
12
Optimization of Sensor Characteristic Using Barber Pole Structures
13
Bridge Configuration
13
Figure 5 A) R-H Characteristic of a Standard Sensor, B) R-H Characteristic of Barber Pole Sensors
13
Figure 6 Barber Pole Sensor
13
Set/Reset and Compensation Coils
14
Figure 7 Bridge Configuration of Barber Pole Sensors
14
Figure 8 Fields Generated by Set/Reset and Compensation Coil
14
Philips MR Sensors for Compass Systems
15
Figure 9 Simplified Circuit Diagram of KMZ 51
15
Signal Conditioning Unit (Scu)
16
Requirements
16
Offset Compensation
17
Figure 10 Effect of Flipping on Sensor Characteristic
17
Figure 11 Block Diagram of Flipping Circuit
17
Figure 12 Timing Diagram for Flipping Circuit
18
Sensitivity Difference (∆S) Compensation
19
Figure 13 Typical MR Sensor Output Characteristic (KMZ10)
19
Non-Orthogonality Compensation
20
Figure 14 Block Diagram of Flipping and Electro-Magnetic Compensation Circuit
20
Circuit Design
21
Supply Voltage Considerations
21
Figure 15 Signal Conditioning Circuit for One Sensor
21
Flipping Generator (Block1)
22
Figure 16 Flip Circuit with Active Current Limiting
22
Pre-Amplifier (Block 2)
23
Offset Compensation (Block 3)
23
Synchronous Rectifier (Block 4)
23
Integral Controller (Block 5)
23
Compensation Coil Driver (Block 6)
23
SCU Without Electro-Magnetic Feedback
24
SCU with Microcontroller
24
Figure 17 Signal Conditioning Circuit with Microcontroller
24
Direction Determination Unit (Ddu)
25
8-Segment Compass
25
Figure 18 Direction Determination for 8-Segment Compass
25
Figure 19 Circuit for 8-Segment Compass
25
High Resolution Compass
26
Interference Field Calibration
27
Figure 20 Typical Test Diagrams Showing Hard Iron and Soft Iron Effects
27
Figure 21 Principle of Bidirectional Calibration
28
True North Calibration
30
Tilt Compensation
31
Figure 22 Tilt Error
31
Figure 23 Tilt Error Magnitudes
32
Figure 24 Definition of Pitch and Roll
32
Figure 25 Electronically Gimbaled Compass
33
System Accuracy
34
Application Examples
35
Figure 26 Analog 8-Segment Compass
35
Figure 27 Analog High Resolution Compass
35
Figure 28 8-Segment Compass with Microcontroller
36
Figure 29 High-End Compass with Microcontroller
36
References
37
APPENDIX 1 List of Abbreviations
38
APPENDIX 2 Unit Conversions
38

Philips KMZ52 General Manual (29 pages)

Magnetoresistive sensors for magnetic field measurement

Brand: Philips | Category: Accessories | Size: 0.66 MB

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Philips KMZ52 Application Note (38 pages)

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Philips KMZ52 General Manual (29 pages)

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