Magnetic Field Sensor Amplifier Current Path
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Solution Overview
Problem
Conventional magnetic field sensors require extra power to drive magnetoresistance elements, which is undesirable.
Innovation Solution
The design of a magnetic field sensor and electronic circuit that utilizes a magnetoresistance element without requiring additional power, achieved by incorporating transistors and voltage sources to generate current signals related to the resistance value of the magnetoresistance element, allowing for power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional current driving methods are used for magnetoresistance elements, then the magnetoresistance element can be driven properly, but extra power is consumed
Solution Approach 1:
The patent merges the current driving function into the existing amplifier circuit by having the amplifier supply current through the magnetoresistance element. This integration eliminates the need for separate power supply circuits, thereby reducing overall power consumption while ensuring proper operation of the magnetoresistance element.
Solution Approach 2:
The amplifier circuit is designed to serve multiple functions: it provides signal amplification and simultaneously supplies the necessary driving current to the magnetoresistance element. This multi-functionality approach allows the same circuit to perform both sensing and driving tasks, eliminating dedicated power consumption for element driving.
2Ease of operation
If extra power is provided to drive magnetoresistance elements, then the elements can operate with proper current, but the overall energy efficiency of the sensor deteriorates
Solution Approach 1:
The amplifier circuit serves itself by using its own output current to drive the magnetoresistance element. The amplifier's output stage naturally provides the necessary current to the sensing element during normal operation, eliminating the need for external power supply circuits and associated energy losses.
3Reliability
If separate power supply circuits are added to drive magnetoresistance elements, then reliable current driving is achieved, but device complexity increases
Solution Approach 1:
The patent combines the power supply function and signal amplification function into a single integrated amplifier circuit. By merging these functions, the circuit maintains reliable current driving capability while avoiding the complexity of separate power supply circuits, connection paths, and control mechanisms.
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 solution enables the magnetic field sensor to operate without extra power consumption, improving energy efficiency and functionality.
Implementation Method 1
A magnetoresistance element changes resistance in response to a magnetic field
Data Source
AI summary
Electronic circuits used in magnetic field sensors use transistors for passing a current through the transistors and also through a magnetoresistance element.