Magnetic Field Detector Circuit Sleep State Power Reduction
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Solution Overview
Problem
Existing magnetic field detectors face challenges in reducing power consumption while maintaining high dielectric strength and load-dump capability, as they often operate continuously, leading to increased current consumption.
Innovation Solution
A method and device that alternate between active and sleep states using a magnetic field measuring device and a wake-up timer, where the magnetic field detector circuit changes states based on predetermined thresholds, allowing the wake-up timer to generate a signal after a set interval, thereby reducing current consumption by switching off the supply voltage during sleep phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the magnetic field detector operates continuously to maintain high dielectric strength and load-dump capability, then the reliability is improved, but the current consumption increases
Solution Approach 1:
The patent applies periodic action by alternating the magnetic field detector between active and sleep states. The detector operates actively for a predetermined interval to maintain reliability capabilities, then enters a sleep state to reduce current consumption. This periodic switching resolves the contradiction by ensuring the detector periodically performs its protective function while minimizing energy consumption during intervals when immediate detection is not critical.
Solution Approach 2:
The patent implements preliminary action through the wake-up timer, which is pre-configured with a predetermined interval before the active state. This timer ensures the detector activates in advance of potential magnetic field events, maintaining readiness and reliability capabilities while allowing the system to remain in low-power sleep mode for extended periods, thus reducing overall current consumption.
2Use of energy by moving object
If the magnetic field detector enters sleep state to reduce power consumption, then the current consumption is reduced, but the response time to detect magnetic fields increases
Solution Approach 1:
The wake-up timer is pre-configured with a predetermined interval that balances power savings with response time requirements. This preliminary timing setup ensures the detector activates before critical events occur, reducing the effective response time while maintaining sleep mode for power conservation. The predetermined interval is optimized to prevent excessive delays in magnetic field detection.
Solution Approach 2:
The periodic switching between sleep and active states creates predictable response intervals. By establishing a fixed predetermined interval for wake-up timing, the system ensures consistent response behavior that balances power consumption reduction with acceptable response time. This periodic pattern allows the system to minimize energy use while maintaining reliable detection capability at predictable intervals.
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 approach significantly reduces average current consumption to less than 100 μA, retaining high dielectric strength up to 24 V and load-dump capability up to 40 V, with adjustable sleep intervals to optimize power savings.
Implementation Method 1
a magnetic field sensor
Data Source
AI summary
A method is provided for operating a magnetic field detector circuit, whereby the magnetic field detector circuit is operated alternately in an active state or in a sleep state and the magnetic field detector circuit has a magnetic field measuring device and a wake-up timer, whereby the magnetic field measuring device comprises a magnetic field sensor. In the active state, the magnetic field measuring device is operated with a supply voltage and an output signal is generated by the magnetic field sensor. The magnetic field detector circuit comprises a wake-up timer, whereby the wake-up timer is operated with the supply voltage in the sleep state and a wake-up signal is generated by the wake-up timer after a predetermined sleep interval, and the magnetic field measuring device changes from the sleep state to the active state.