Vehicle Power Supply Logic for Start Signal-Based Battery Switching
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Solution Overview
Problem
Existing power supply devices for vehicles face challenges in miniaturization and vehicle safety, as they rely on physical switching elements that occupy significant space and do not continuously operate when the vehicle ignition is turned off.
Innovation Solution
A power supply device with a signal receiving unit, communication unit, and on/off determination unit that uses logic to determine the start state of the system based on start signal changes and communication signals, allowing for continuous operation even when the vehicle ignition is off.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a physical switching circuit composed of FETs and BJTs is used to control battery power, then the switching function can be achieved, but the device occupies a large area on the substrate making miniaturization difficult
Solution Approach 1:
The patent replaces the physical switching circuit (mechanical/electrical system using FETs and BJTs) with a logic-based control system that processes signals to determine system state. This substitution eliminates the need for large physical switching elements while maintaining the switching function through logical operations on signal states.
Solution Approach 2:
The patent uses signal copies and state representations to track system status. Instead of physical switches, the system creates logical copies of the start signal state and communicates this information through signal processing, allowing the switching function to be achieved through information processing rather than physical component manipulation.
2Loss of energy
If the system is turned off with vehicle ignition to prevent battery discharge, then battery power conservation is achieved, but the system cannot continuously operate when needed for safety monitoring
Solution Approach 1:
The patent implements a dynamic power management system that can switch between different operational states (fully on, fully off, or partial operation) based on real-time signal analysis. The system dynamically determines whether continuous operation is necessary by processing start signals and communication signals, allowing flexible adaptation between power conservation and continuous monitoring needs.
Solution Approach 2:
The system uses feedback from communication signals and start signal analysis to continuously monitor system state and determine whether power should be supplied. This feedback mechanism allows the system to make intelligent decisions about continuous operation versus power conservation, ensuring safety-critical functions remain operational while preventing unnecessary battery discharge.
3Reliability
If the system always operates using dark current when vehicle ignition is off, then continuous operation is maintained, but it is difficult to distinguish between noise signals and actual start signals
Solution Approach 1:
The patent performs preliminary analysis of the start signal characteristics before making the decision to activate the system. By examining signal patterns, duration, and context in advance, the system can distinguish between noise and genuine start signals, preventing false activations while maintaining continuous operation capability when truly needed.
Solution Approach 2:
The system uses feedback from communication signals to verify the authenticity of detected start signals. By cross-referencing multiple signal sources and analyzing their consistency, the system can accurately distinguish between noise and legitimate activation requests, improving signal detection precision while maintaining reliable continuous operation.
Data Source
AI summary
The present disclosure relates to a power supply device of a system contained inside a vehicle. Specifically, the present disclosure relates to a technique for implementing a switching function in place of a switching circuit which limits the power of a battery. The power supply device, according to the present disclosure, determines the start state of the system using a change in the state of a start signal of the vehicle, and supplies power or stops the supply of power according to the determined start state.