Magnetoresistive Sensor Circuitry for Two-Wire DC Compatibility
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Solution Overview
Problem
Conventional sensor systems, particularly those using mechanical reed switches, face reliability issues due to fragility and mechanical fatigue, and solid state semiconductor sensors require a three-wire configuration, which is not compatible with two-wire DC connections.
Innovation Solution
The magnetoresistive sensor configuration employs magnetic field detection circuitry with an electrical storage element and isolation circuitry to maintain a minimum operating voltage and current, allowing for a two-wire DC connection by storing energy during logic high states and driving output during logic low states, using components like AMR bridges, dual threshold comparators, and charge pumps to adapt to alternating current patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If mechanical reed switches are used in sensor systems, then the system can operate with two-wire DC connections, but the reliability deteriorates due to fragility and mechanical fatigue
Solution Approach 1:
The patent replaces mechanical reed switches with solid state semiconductor sensors that use magnetic field detection circuitry. This substitution eliminates mechanical moving parts, contacts, and switches, thereby eliminating mechanical fatigue and fragility while maintaining the two-wire DC connection capability through integrated circuitry and feedback mechanisms.
2Reliability
If solid state semiconductor sensors are used, then reliability is improved by eliminating mechanical components, but the device complexity increases due to requiring a three-wire configuration
Solution Approach 1:
The patent merges multiple functions into the solid state semiconductor sensor by integrating magnetic field detection circuitry, feedback connections, and electrical storage elements within a single device. This integration combines the sensing function with power management and signal conditioning, thereby maintaining reliability benefits while reducing the need for separate components and simplifying the overall system configuration to accommodate two-wire DC connections.
Solution Approach 2:
The solid state semiconductor sensor is designed with multi-functionality, serving as both a magnetic field detector and a power management device. The feedback connection and electrical storage element enable the sensor to perform multiple functions including sensing, signal conditioning, and power regulation, thereby reducing the need for additional separate components and simplifying the system architecture.
3Measurement precision
If solid state semiconductor sensors with three-wire configuration are used, then measurement precision is improved, but ease of operation deteriorates due to incompatibility with two-wire DC connections
Solution Approach 1:
The patent implements dynamic operation by using feedback connections that periodically alternate between high and low logic levels. This dynamic feedback mechanism allows the sensor to maintain precise magnetic field detection while adapting to two-wire DC connection requirements, enabling the system to switch between different operational states to achieve both precision and compatibility.
Solution Approach 2:
The feedback connection operates periodically, alternating between high and low logic levels to enable the sensor to function with two-wire DC connections. This periodic action allows the electrical storage element to charge and discharge in sync with the feedback cycles, maintaining measurement precision while accommodating the simplified two-wire configuration.
4Adaptability or versatility
If feedback connections with periodic alternating logic levels are used, then compatibility with two-wire DC connections is improved, but energy loss increases due to periodic charging and discharging
Solution Approach 1:
The electrical storage element is charged during logic high periods in advance of when power is needed during logic low periods. This preliminary action of storing energy during high logic states prepares the system to maintain operation during low logic states without requiring continuous power input, thereby reducing energy loss associated with frequent charging and discharging cycles.
Solution Approach 2:
The feedback connection and electrical storage element work together to maintain continuous useful action by ensuring that power is available during both high and low logic periods. The storage element bridges the gaps between periodic feedback cycles, maintaining continuous operation and reducing energy loss by eliminating idle periods where the sensor would otherwise be powerless.
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 configuration enhances the reliability and compatibility of solid state semiconductor sensors with two-wire DC connections, reducing wear and improving cost and quality by maintaining minimum operating currents and voltages, thus overcoming the limitations of mechanical reed switches.
Implementation Method 1
magnetic field detection circuitry configured to, in the presence of an external magnetic source, provide a periodically alternating high and low logic low level
Implementation Method 2
an electrical storage element in electrical communication with the input feed. During the periodic instances in which the magnetic field detection circuitry is in the logic high level indicating the absence of an external magnetic source, the magnetoresistive sensor configuration may be configured to direct at least a portion of the electrical current received via the input feed to the electrical storage element so as to store electrical energy in the electrical storage element
Implementation Method 3
the magnetic field detection circuitry may also include an anisotropic magneto-resistive (AMR) bridge or hall sensor configured to identify the presence of the external magnetic source
Implementation Method 4
a charge pump configured to increase the voltage of the electrical input feed current. In some cases, the increased voltage may be directed to an electrical storage element in order to minimize the size of the charge pump
Data Source
AI summary
Apparatuses and sensor systems are described with magnetoresistive sensor configurations. An example magnetoresistive sensor configuration includes an input feed that receives an electrical current, magnetic field detection circuitry in electrical communication with the input feed, and a feedback connection in electrical communication with the magnetic field detection circuitry and the input feed. The magnetic field detection circuitry transitions between a released state and an operated state in response to an external magnetic source. The configuration further includes an electrical storage element in electrical communication with the input feed that maintains a minimum operating voltage and current within the magnetoresistive sensor in an instance in which the magnetic field detection circuitry is operated.