Magnetic Sensor Voltage Regulation via Series Resistor Network
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Solution Overview
Problem
Magnetic sensors with high sensitivity magnetic detection elements often produce output voltages that exceed the input voltage range of impedance matching devices, leading to potential erroneous signals and increased design costs due to the need for voltage range adjustments.
Innovation Solution
A magnetic sensor design incorporating a magnetic detection element circuit with two magnetoresistance effect elements connected in series, an impedance matching device, and resistors with specific resistance values and temperature coefficients to control the output voltage within the impedance matching device's range, even when current supply systems for the detection element and impedance matching device are separate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high sensitivity magnetic detection elements (GMR, TMR) are used to increase output voltage, then measurement precision is improved, but the output voltage exceeds the input voltage range of the impedance matching device
Solution Approach 1:
A voltage dividing circuit is introduced as an intermediary between the magnetic detection element circuit and the impedance matching device. This circuit divides the high output voltage from the magnetic detection element to produce a reduced voltage signal that falls within the input voltage range of the impedance matching device, thereby resolving the voltage range mismatch while preserving the high sensitivity of the magnetic detection element
Solution Approach 2:
The invention changes the voltage parameter by introducing a voltage dividing circuit with specific resistance ratios. The circuit transforms the high voltage output from the magnetic detection element into a lower voltage signal suitable for the impedance matching device, allowing the system to maintain high sensitivity while operating within safe voltage ranges
2Reliability
If the impedance matching device is changed to one with a larger input voltage range to accommodate high output voltage, then reliability is improved, but device complexity and design cost increase
Solution Approach 1:
The invention segments the system into distinct functional blocks: the magnetic detection element circuit, the voltage dividing circuit, and the impedance matching device. By separating the voltage adjustment function into its own dedicated circuit, the impedance matching device can remain simple and unchanged, while the voltage dividing circuit handles the voltage range adaptation
Solution Approach 2:
The voltage dividing circuit serves as an intermediary that bridges the high-voltage magnetic detection element and the standard impedance matching device. This intermediary component allows the use of conventional, simple impedance matching devices without requiring changes to the power source IC or the impedance matching device itself
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
This design effectively regulates the output voltage within the impedance matching device's range, preventing erroneous signals and reducing design costs by allowing separate current supply systems without requiring changes to the power source IC.
Implementation Method 1
a first magnetic detection element and a second magnetic detection element, which are connected in series
Data Source
AI summary
A magnetic sensor includes a magnetic detection element circuit that includes first and second magnetic detection elements, which are connected in series, and an output terminal, which is positioned between the first and second magnetic detection elements; an impedance matching device, which has a prescribed input voltage range and is connected to an output terminal of the magnetic detection element circuit; a first current supply source, which supplies an electric current to the magnetic detection element circuit; and a second current supply source, which supplies an electric current to the impedance matching device. A resistor is provided between the output terminal of the magnetic detection element circuit and the first current supply source and/or a reference electric potential point.