Hall Device Phase Control for Offset Voltage Removal
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Solution Overview
Problem
Existing magnetic measuring apparatuses face challenges in accurately measuring magnetic fields due to offset voltages generated by Hall devices and amplifiers, which hinder the performance of analog to digital converters and result in increased remaining offset voltages, especially during rising and falling times.
Innovation Solution
A magnetic detection apparatus that includes a Hall device, a Hall output controller, an amplifier, and an amplifier output controller, which controls the output phase of the Hall device to ensure symmetrical phase alteration orders in a control cycle, making rising and falling time losses identical to remove offset voltages and improve converter performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If alternative technology is used to remove prospective offset voltage of Hall device and amplifier, then offset voltage removal is achieved, but remaining offset voltage increases due to power dissipation during rising and falling time
Solution Approach 1:
The patent applies periodic action by implementing a control method that alternates between different measurement modes (first measurement mode and second measurement mode) in a cyclic manner. The Hall device performs measurements at different phases during rising time and falling time periodically, allowing offset voltages to be identified and removed through differential processing of these periodic measurements.
Solution Approach 2:
The patent implements preliminary action by performing offset voltage compensation measurements before the actual magnetic field measurements. The control method first measures offset voltages during rising and falling phases, then uses these preliminary measurements to compensate for offset voltages in subsequent actual measurements, thereby preventing remaining offset voltage from affecting measurement accuracy.
2Measurement precision
If control method of Hall device is implemented to remove prospective offset voltage, then offset voltage is reduced, but performance of analog to digital converter is hindered due to remaining offset voltage
Solution Approach 1:
The patent implements feedback by using the offset voltage measurements obtained during rising and falling phases to dynamically adjust and compensate for offset voltages in the analog to digital converter. The control method continuously monitors offset voltages and applies compensation based on these feedback measurements, thereby maintaining converter performance while removing offset voltages.
Solution Approach 2:
The patent introduces an intermediary compensation mechanism that mediates between the Hall device output and the analog to digital converter. This intermediary processing stage calculates offset voltages from periodic measurements and applies compensation before the signal reaches the analog to digital converter, thereby protecting converter performance while achieving offset voltage removal.
3Measurement precision
If Hall device output phase is controlled for symmetrical phase alteration, then rising and falling time losses are made identical, but device complexity increases
Solution Approach 1:
The patent applies dynamics by implementing a dynamic control method that adjusts the output phase of the Hall device in real-time during operation. The control mechanism dynamically switches between different measurement modes and adjusts timing parameters to achieve symmetrical phase alteration, rather than relying on fixed static configurations, thereby managing complexity through adaptive control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively removes offset voltages and enhances the performance of analog to digital converters by ensuring symmetrical phase alterations, thereby improving the accuracy and precision of magnetic field measurements.
Implementation Method 1
a Hall device configured to include terminals and to generate an electromotive force based on a magnetic field
Data Source
AI summary
A magnetic detection apparatus includes a Hall device configured to include terminals and to generate an electromotive force based on a magnetic field, a Hall output controller configured to control an output of the Hall device such that an output phase alteration order of a first section of the output is symmetrical to an output phase alteration order of a second section of the output on the basis of half cycle of a control cycle of the Hall device, an amplifier configured to be connected to output terminals of the Hall device to amplify the output of the Hall device, and an amplifier output controller configured to control an output polarity of the amplifier based on the output of the Hall device.