Magnetic-Field Detection Microcomputer with Variable Voltage Reference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional magnetic-field detection systems require complex variable voltage circuits to cancel temperature characteristics, making them difficult to determine magnetic-field intensity without a complicated configuration.
Innovation Solution
A magnetic-field detection microcomputer with a differential amplifier, a variable voltage circuit generating a single reference voltage, a comparator, a voltage controlling register, and a CPU that uses pre-stored tables to determine magnetic-field intensity by comparing output voltages, simplifying the configuration and enabling easy detection of magnetic-field presence or absence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional variable voltage circuit with multiple reference voltages is used to cancel temperature characteristics, then temperature compensation is improved, but device complexity increases
Solution Approach 1:
The patent changes the parameter of reference voltage from multiple fixed voltages to a single variable voltage that can be dynamically adjusted. The variable voltage circuit generates one reference voltage whose level is changed according to temperature, replacing the need for multiple reference voltages with different temperature coefficients. This resolves the contradiction by maintaining temperature compensation capability while reducing circuit complexity.
2Device complexity
If a simple voltage reference circuit is used, then device complexity is reduced, but temperature compensation capability is lost
Solution Approach 1:
The patent introduces dynamics to the reference voltage circuit by making the reference voltage variable rather than fixed. The variable voltage circuit dynamically adjusts the reference voltage level based on temperature conditions, allowing a simple circuit structure to achieve temperature compensation. This resolves the contradiction by adding temporal variability to compensate for temperature effects without increasing structural complexity.
3Measurement precision
If multiple reference voltages are generated to cover different magnetic field intensities, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent makes a single reference voltage circuit universal by enabling it to provide multiple reference voltage levels through dynamic adjustment. The variable voltage circuit can generate different reference voltage levels corresponding to different magnetic field intensity ranges, allowing one circuit to perform the function of multiple circuits. This resolves the contradiction by achieving multi-functionality in a single circuit structure.
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 allows for straightforward determination of magnetic-field intensity without a complex variable voltage circuit, reducing system complexity and enhancing detection accuracy across a wide range of magnetic-field strengths.
Implementation Method 1
a magnetic-field detection device 10 which detects a magnetic field
Data Source
AI summary
A magnetic-field detection microcomputer includes: a magnetic-field detection device; a differential amplifier; a variable voltage circuit which generates a reference voltage that is variable; a comparator which compares an output from the differential amplifier with the reference voltage; a register which outputs a voltage control value to the variable voltage circuit; a ROM which previously store a first table in which a magnetic-field intensity and the voltage control value are associated with each other; and a CPU which sets, to the register, the voltage control value, and determines presence or absence of the magnetic-field intensity associated with the voltage control value based on a result of the comparison by the comparator and the first table.