Auxiliary Power Source Charging Timing for Overdischarge Prevention
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Solution Overview
Problem
Auxiliary power sources in power source apparatuses exhibit self-discharge properties, leading to gradual depletion over time, especially when not used for extended periods. This can result in overdischarge, accelerating deterioration and potentially causing system failures.
Innovation Solution
A power source apparatus is designed with an auxiliary power source and a control circuit that performs an initial check upon activation. The control circuit then waits for vehicle traveling preparation to be completed before charging the auxiliary power source. Additionally, it charges the auxiliary power source when both a time threshold and a voltage threshold are met, even before traveling preparation is finished, to prevent overdischarge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the auxiliary power source is not charged for a long period of time, then the available amount of the auxiliary power source gradually decreases due to self-discharge, but charging the auxiliary power source too early may cause overdischarge and deterioration
Solution Approach 1:
The control circuit performs preliminary actions by executing an initial check upon activation and monitoring elapsed time since the check completion. This preliminary time-based monitoring enables the system to determine the appropriate charging timing before actual charging occurs, preventing both overdischarge and unnecessary delays in charging.
Solution Approach 2:
The control circuit continuously monitors the voltage across the auxiliary power source and compares it against a voltage threshold. This feedback mechanism allows the system to dynamically adjust charging operations based on real-time voltage status, ensuring charging occurs only when necessary and preventing overdischarge while maintaining reliability.
2Reliability
If the control circuit waits for traveling preparation to be completed before charging, then the auxiliary power source may reach overdischarged state during waiting period, but charging before traveling preparation completes may consume excessive electricity from main power source
Solution Approach 1:
The control circuit uses multiple parameters (elapsed time since initial check, voltage threshold, and traveling preparation status) to determine charging timing. By dynamically evaluating these parameters together, the system optimizes the balance between maintaining auxiliary power source voltage and minimizing main power source consumption, charging only when both time and voltage conditions are satisfied.
3Object-affected harmful factors
If the auxiliary power source is charged immediately upon activation, then overdischarge is prevented, but the main power source is unnecessarily consumed during initial check and traveling preparation period
Solution Approach 1:
The system performs a preliminary initial check upon activation and starts monitoring elapsed time without immediately charging. This preliminary phase allows the system to assess the actual need for charging based on time elapsed and voltage status, preventing unnecessary energy consumption while still preparing to prevent overdischarge if needed.
Solution Approach 2:
The control circuit continuously monitors voltage across the auxiliary power source and compares it against the voltage threshold. This feedback ensures charging occurs only when the voltage actually drops below the threshold, preventing both overdischarge and unnecessary charging that would waste main power source energy during normal operation periods.
Data Source
AI summary
A power source apparatus includes: an auxiliary power source; and a control circuit configured to control charging and discharging of the auxiliary power source. The control circuit is configured to, after completion of the initial check, charge the auxiliary power source after waiting for traveling preparation of the vehicle to be completed. The control circuit is configured to, after the completion of the initial check, charge the auxiliary power source when both of a first condition and a second condition are satisfied even before the completion of the traveling preparation of the vehicle. The first condition is a condition in which an amount of elapsed time from when the initial check is completed is equal to or more than a time threshold. The second condition is a condition in which voltage across the auxiliary power source is less than a voltage threshold.