Inductive Wake-Up Circuit for Low-Power Angular Position Sensing
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Solution Overview
Problem
Employing always-active circuitry to monitor angular position reduces battery life in automotive and industrial applications.
Innovation Solution
A low-power wake-up system that integrates phase signals from angular position sensors using a rotatable sensor and interface circuit to generate a wake-up signal for an external power source, including a driver circuit and signal processor to rectify and integrate phase signals for accurate angular position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If always-active circuitry is employed to monitor angular position, then measurement precision is improved, but use of energy worsens
Solution Approach 1:
The system employs periodic wake-up signals to activate the angular position sensor only when needed, rather than keeping it continuously active. The sensor is triggered by rotor position events (e.g., every revolution or at specific quadrants), allowing accurate position monitoring while dramatically reducing power consumption during idle periods.
Solution Approach 2:
The system pre-conditions the sensor by establishing a wake-up trigger mechanism that automatically activates the sensor when specific rotor position events occur. This preliminary setup allows the sensor to remain in low-power mode until needed, then quickly activate to capture position data before returning to sleep mode.
2Use of energy by moving object
If low-power circuitry is used to periodically monitor angular position, then use of energy is improved, but measurement precision worsens
Solution Approach 1:
The system uses feedback from the rotor position to trigger sensor activation. When the rotor reaches predetermined positions (detected by Hall sensors or other position indicators), this feedback signal wakes up the angular position sensor, ensuring measurements are taken at the correct moments without requiring continuous sensor operation.
Solution Approach 2:
The angular position sensor activates itself in response to rotor position events without requiring external control. The sensor monitors for wake-up triggers (such as rotor revolution markers) and automatically activates to take measurements, then returns to low-power mode, making the system self-regulating and eliminating the need for always-active control circuitry.
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
Enhances battery life by reducing power consumption while accurately monitoring angular position and activating external power sources as needed.
Implementation Method 1
The rotatable sensor is configured to generate a plurality of phase signals
Implementation Method 2
The interface circuit is configured to generate a first rectified signal by rectifying a first phase signal
Implementation Method 3
The interface circuit is configured to generate a wake-up signal for the external power source based on the first integrated signal
Data Source
AI summary
Wake-up systems and wake-up methods for an external power source and interfaces for angular position sensors. The system includes a rotatable sensor and an interface circuit. The rotatable sensor is configured to generate a plurality of phase signals. The interface circuit is configured to generate a first rectified signal by rectifying a first phase signal of the plurality of phase signals. The interface circuit is also configured to generate a first integrated signal by integrating the first rectified signal. The interface circuit is further configured to generate a wake-up signal for the external power source based on the first integrated signal.