Power Storage Management Device Status Signal Circuit
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Solution Overview
Problem
Existing management systems for power storage units in vehicles, particularly those using only hardware processing, can incorrectly open the contact between the secondary battery and motor drive inverter due to measurement circuit failures, leading to erroneous operation and safety issues.
Innovation Solution
A management device with a drive circuit, status determination circuit, status signal output circuit, and control signal output circuit is implemented, using binary and PWM signals to accurately determine the status of the power storage unit and prevent the switch from being opened due to measurement circuit abnormalities, ensuring safe and reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a redundant measurement system is implemented, then safety is improved through strict management of monitoring parameters, but the system complexity and cost increase
Solution Approach 1:
The measurement and control functions are segmented into two distinct systems with different levels of complexity. The sub control system uses simple hardware processing for critical measurements, while the main control system uses software processing for comprehensive monitoring. This segmentation achieves redundancy without duplicating the entire complex measurement system, thereby improving safety while controlling complexity
Solution Approach 2:
Different parts of the control system are assigned different levels of processing complexity appropriate to their functions. Critical safety-related measurements use simple, fast hardware processing in the sub system, while non-critical monitoring functions use software processing in the main system. This local differentiation of quality optimizes the balance between safety, speed, and complexity
Data Source
AI summary
A status signal output circuit outputs a first status signal indicating with a binary level whether or not power the storage unit is normal in accordance with a determination result of the status determination circuit, and, as a second status signal, a pulse width modulation (PWM) signal according to the status of the power storage unit when a measurement circuit including the status determination circuit is normal, or a signal having a axed level when the measurement circuit including the status determination circuit is abnormal. A control signal output circuit outputs, to a drive circuit, a control signal for control to bring a switch inserted between the power storage unit and a load into an OFF state when the power storage unit has abnormality, in accordance with the first status signal and the second status signal output from the status signal output circuit.