Magnetic Sensor IC Reference Voltage Generation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional magnetic sensor integrated circuits have complex and costly power modules due to the use of internal bandgap reference voltage sources for generating constant reference voltages, which complicates the design and increases costs.
Innovation Solution
A magnetic sensor integrated circuit that generates reference voltage based on an input common-mode voltage, using a power module with a rectifier, voltage regulating unit, and current source generation circuit to simplify the power supply and reduce costs, while maintaining accurate magnet detection signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an internal bandgap reference voltage source is used to generate constant reference voltage, then the reference voltage stability is improved, but the power module complexity and cost increase
Solution Approach 1:
The patent extracts the bandgap reference voltage source from the integrated circuit and relocates it to the external power supply device. This removes the complex internal reference voltage generation circuitry while maintaining stable reference voltage through the external source, directly resolving the contradiction between reliability and device complexity.
2Reliability
If an internal bandgap reference voltage source is used to generate constant reference voltage, then the reference voltage stability is improved, but the manufacturing cost increases
Solution Approach 1:
By extracting the bandgap reference voltage source from the magnetic sensor integrated circuit and placing it in the external power supply, the patent eliminates the need for expensive internal reference voltage generation circuitry. This reduces manufacturing costs while maintaining reference voltage stability through the external source.
3Device complexity
If the reference voltage is generated based on input common-mode voltage, then the power module is simplified and cost is reduced, but the reference voltage may vary with voltage fluctuations
Solution Approach 1:
The patent employs feedback mechanisms where the external power supply device monitors and adjusts the reference voltage based on the input common-mode voltage variations. This feedback control ensures that the reference voltage remains stable and consistent even when input voltage fluctuates, while maintaining the simplified power module 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 simplifies the power module, reduces costs, and ensures accurate magnet detection signals by generating reference voltage based on input common-mode voltage, allowing for reliable and efficient magnetic field detection without the need for complex bandgap reference voltage sources.
Implementation Method 1
a magnetic sensing element configured to sense an external magnetic field and output an electrical detection signal
Implementation Method 2
the rectifier may have an input terminal connected with the input port and may be configured to convert a voltage provided by the external power supply into a first DC voltage
Data Source
AI summary
A magnetic sensor integrated circuit, a motor assembly and an application device are provided. The magnetic sensor integrated circuit includes a magnetic field detection circuit. The magnetic field detection circuit includes a magnetic sensing element configured to sense an external magnetic field and output an electrical detection signal, a signal processing unit configured to perform amplification and interference rejection on the electrical detection signal to generate an analog electrical signal, and a comparator configured to compare the analog electrical signal with a reference voltage, and output magnet detection signal corresponding to the external magnetic field. The reference voltage is generated based on an input common-mode voltage of the magnetic field detection circuit.