Monitor Circuit for Regulated Voltage Error Detection
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Solution Overview
Problem
In high precision applications such as automobiles, magnetic field sensing circuits face accuracy issues due to variations in detected motion caused by irregularities in target object profiles, and existing monitoring technologies are inadequate for ensuring proper power supply to magnetic field sensors, which is critical for safety and compliance with standards like Automotive Safety Integrity Level (ASIL).
Innovation Solution
A monitor circuit that detects errors in regulated voltages and currents by using comparators powered by separate regulated voltages, generating error signals to indicate overvoltage or undervoltage conditions, thereby ensuring accurate operation and safety in magnetic field sensor ICs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If magnetic field sensing elements and other circuitry are powered by regulated voltages to ensure proper operation, then detection accuracy is improved, but the risk of overvoltage or undervoltage errors affecting safety and compliance increases
Solution Approach 1:
The monitor circuit performs preliminary detection of voltage errors (overvoltage or undervoltage conditions) before they can affect the magnetic field sensing elements. By continuously monitoring the regulated voltages that power the sensing circuitry and generating error signals when voltage levels deviate from acceptable ranges, the system prevents power-related errors from compromising detection accuracy or safety compliance.
2Reliability
If multiple separate devices are used for monitoring voltage and current levels to ensure comprehensive error detection, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent combines voltage monitoring and current monitoring functions into a single integrated monitor circuit. This unified circuit uses multiplexers to selectively connect different voltage sources and sensing elements to a shared comparator, allowing comprehensive monitoring of multiple regulated voltages and currents without requiring separate monitoring devices for each parameter. The integration reduces device complexity while maintaining reliable error detection capability.
Solution Approach 2:
The monitor circuit is designed with universal functionality to monitor multiple different voltage sources (V+, V-, Vreg1, Vreg2) and provide comprehensive error detection for both overvoltage and undervoltage conditions. The use of multiplexers allows a single comparator and control logic to serve multiple monitoring functions, making the circuit adaptable to various power supply configurations without requiring dedicated monitoring hardware for each voltage rail.
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 effectively monitors and corrects voltage and current levels in real-time, reducing the risk of detection inaccuracies and ensuring compliance with safety standards by reducing the number of devices required for error detection, thus enhancing reliability and safety in magnetic field sensor applications.
Implementation Method 1
A monitor circuit that detects errors in regulated voltages and currents by using comparators powered by separate regulated voltages, generating error signals to indicate overvoltage or undervoltage conditions
Data Source
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AI summary
A monitor circuit for monitoring a level of a first and second regulated source may monitor a voltage level of regulated voltages or a current level of regulated currents. In an embodiment, the monitor circuit includes circuitry responsive to a first regulated voltage and to a second regulated voltage. A first circuit responsive to the first regulated voltage and to the second regulated voltage generates a first error signal indicative of at least one of an overvoltage condition of the first regulated voltage and an undervoltage condition of the second regulated voltage. A second circuit responsive to the first regulated voltage and to the second regulated voltage generates a second error signal indicative of at least one of an undervoltage condition of the first regulated voltage and an overvoltage condition of the second regulated voltage. A method for monitoring the levels of first and second regulated sources is also provided.