Battery Power Relay Control for Dark Current Interruption
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Solution Overview
Problem
Existing power supply control devices waste energy by continuing to supply power to interruption control circuits when battery voltage drops, leading to potential battery exhaustion, as they stop power to all loads but not the control circuits.
Innovation Solution
A power supply control device with a control unit, relay, and detection unit that switches between drive, standby, and interruption modes, interrupting dark current flow when the battery charge level reaches a threshold, and allowing manual switching to resume power without control unit intervention.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply control device stops power to all loads when battery voltage is low, then battery exhaustion is prevented, but the control unit continues to consume power causing energy waste
Solution Approach 1:
The patent segments the power supply system into two independent parts: load units and control units. By providing separate power supply paths and control mechanisms for each, the system can selectively stop power to load units while maintaining or stopping power to control units independently, thus preventing energy waste in control units while still protecting against battery exhaustion
Solution Approach 2:
The control unit is extracted from the general load category and given separate power management. The patent creates an independent power supply path for control units through the second relay, allowing the control unit to be taken out of the automatic power cutoff system and managed separately, enabling it to maintain operation or be independently controlled without affecting the main load power cutoff function
2Duration of action of stationary object
If the relay interrupts dark current flow to prevent battery depletion, then battery life is extended, but the control unit loses ability to manage power resumption
Solution Approach 1:
The system performs preliminary action by maintaining the control unit in a standby state with minimal power supply even when load units are powered off. The control unit remains pre-positioned and ready to manage power resumption without requiring full system reinitialization, enabling quick and easy power resumption when needed
Solution Approach 2:
The control unit serves as an intermediary between the battery and load units. Even when load units are powered off to extend battery life, the control unit remains active as a mediator that can detect battery status and control power resumption to load units, thus maintaining operational control while extending battery duration
Data Source
AI summary
In a power supply control device, a control unit is switchable between a drive mode, in which a drive current flows from a battery to load units and the control unit, a standby mode, in which the drive current is interrupted and a dark current flows, and an interruption mode, in which the dark current is interrupted. When a charge level of the battery detected by a battery sensor is lower than or equal to a dark current interruption threshold in the standby mode, a relay control unit of the control unit switches a relay to interrupt the dark current flowing from the battery to the load units and the control unit and switch from the standby mode to the interruption mode.