Power Distribution Box Wake-Up Circuit for Multi-Source MCU Activation
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Solution Overview
Problem
Current wake-up circuits for microcontrollers in power distribution boxes have only three options for waking up the microcontroller, which is insufficient and desirable to have at least four ways to ensure reliable system operation.
Innovation Solution
A wake-up circuit is introduced that includes a first and second source input, and first and second conversion units, which process signals from electric devices and the CAN line to change the voltage potential of the system basis chip, thereby transmitting a wake-up signal to the microcontroller.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If only three inputs are used in the system basis chip for wake-up signals, then the device complexity is reduced, but the reliability and versatility of the power distribution box is insufficient
Solution Approach 1:
The patent combines multiple wake-up signal sources (first electric device, second electric device, CAN line, and fourth wake-up source) into a single first input of the system basis chip. The conversion units process signals from different sources and generate voltage potential changes that all converge at the same input pin, thereby increasing versatility without proportionally increasing device complexity
Solution Approach 2:
The first input of the system basis chip is designed to serve multiple functions by receiving processed signals from various sources through conversion units. This single input can be triggered by different wake-up sources, making it a universal wake-up interface that handles multiple wake-up scenarios through one dedicated pin
2Reliability
If multiple conversion units are added to process signals from different sources, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The wake-up circuit is segmented into distinct conversion units (first conversion unit, second conversion unit, third conversion unit) that can independently process signals from different sources. Each conversion unit handles a specific signal source and generates the appropriate voltage potential change, allowing modular design that improves reliability through redundancy while managing complexity through functional separation
3Use of energy by moving object
If the microcontroller enters sleep state after predetermined period of inactivity, then energy consumption is reduced, but the response time for wake-up events may be delayed
Solution Approach 1:
The conversion units are designed to detect voltage potential changes and generate wake-up signals in advance of actual wake-up events. By monitoring for voltage changes from various sources and preparing wake-up signals beforehand, the system ensures rapid microcontroller activation when wake-up conditions are met, minimizing response time while maintaining sleep state for energy savings
Data Source
AI summary
A power distribution box having a wake-up circuit for causing a system basis chip to transmit a wake-up signal to wake up a microcontroller is provided. The wake-up circuit combines an input from actuating two different electric devices, the wake-up circuit includes a first conversion unit and a second conversion unit. The first conversion unit is interposed between a first source input and a first input, the first conversion unit configured to process the pulsed signal and ground the voltage potential for a period of time, changing the potential of the system basis chip to wake up the system basis chip. The second conversion unit is interposed between the second source input and the first input and is configured to process the signal to ground the potential of the system basis chip, changing the potential of the system basis chip to wake up the system basis chip.