In-Vehicle Backup Power Supply Control Device
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing in-vehicle backup power supply systems face challenges in reliably notifying external devices about the state of the power storage unit without increasing cost and size, especially when the charging/discharging unit fails, leading to potential power supply disruptions.
Innovation Solution
An in-vehicle backup power supply control device is designed with a voltage detection unit and a signal interruption unit that interrupts a predetermined signal to external devices if the charging voltage falls below a threshold, allowing for state notification without additional communication lines or ports, ensuring reliable state indication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If components are added to ensure higher reliability of power storage unit state notification, then reliability is improved, but cost and size increase
Solution Approach 1:
The existing signal transmission path between the control unit and external device is made to serve dual purposes: transmitting control signals and notifying the state of the power storage unit. By utilizing the existing communication interface for both control and status notification, the system achieves reliable state notification without adding dedicated communication components, thereby avoiding increases in cost and size while improving reliability
Solution Approach 2:
The control unit itself performs the notification function by outputting predetermined signals that indicate the state of the power storage unit. Instead of requiring a separate notification device or additional communication module, the existing control unit is configured to self-notify the external device of the power storage unit's state through its existing signal transmission capability
2Reliability
If a dedicated notification system is added for power storage unit state, then reliability is improved, but device complexity increases
Solution Approach 1:
The notification function for power storage unit state is merged with the existing control signal transmission path. The same communication interface and signal lines used for control purposes are also used to convey the state information, eliminating the need for separate dedicated notification hardware and reducing overall device complexity while maintaining reliable notification
Data Source
AI summary
Provided is an in-vehicle backup power supply control device or an in-vehicle backup power supply configured to generate a notification indicating the state of a power storage unit to an external device. When a main power supply fails, a control device applies a voltage to a backup target load from a power storage unit. The control device is provided with a charging/discharging unit for charging the power storage unit and discharging the power storage unit, a voltage detection unit for detecting a voltage of the power storage unit, a control unit for controlling the operation of the charging/discharging unit, and a signal interruption unit for interrupting the output of the predetermined signal to a device external to the control device in a case where the voltage value (Vout) of the power storage unit detected by the voltage detection unit is smaller than a predetermined first threshold.