Wire Harness Backup Charging Control for Peak Load Limiting
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Solution Overview
Problem
The load on an on-board power supply system increases when multiple power storage portions are used as backup power supplies, as supplying the same charge current to each would exceed the system's capacity.
Innovation Solution
An on-board backup control apparatus that controls charge units to supply charge current to a subset of power storage portions in a first state during a first period, followed by constant voltage charging, and to another subset in a second state with suppressed charge current during the first period, and increased charge current during the second period, ensuring the total charge current remains within a permissible range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple power storage portions are used as backup power supplies with the same charge current to each, then the redundancy of power supply is increased, but the load on the power storage apparatus increases
Solution Approach 1:
The plurality of power storage portions is divided into two subsets: a first subset charged during a first period, and a second subset charged during a second period. This segmentation allows the charge current to be distributed across different time periods rather than all simultaneously, reducing the peak load on the power storage apparatus while maintaining redundancy.
Solution Approach 2:
The charging operation is divided into periodic phases: a first period where the first subset is charged, followed by a second period where the second subset is charged. This periodic action ensures that not all power storage portions draw charge current at the same time, thereby reducing the overall load on the power storage apparatus while still providing backup capability.
2Manufacturing precision
If charge current is supplied to all power storage portions simultaneously, then each power storage portion is charged adequately, but the total charge current exceeds the permissible range
Solution Approach 1:
The charge units are dynamically controlled to operate in different states at different times. During the first period, charge units corresponding to the first subset operate in a first state, while charge units for the second subset are in a second state. This dynamic control allows adequate charging of each subset without exceeding the total permissible charge current.
Solution Approach 2:
The operating state of charge units is changed over time. Charge units transition from a first state during the first period to a second state during the second period, depending on which subset is being charged. This parameter change in the charge unit states enables proper charge current distribution while maintaining control within permissible limits.
Data Source
AI summary
An adjustment unit of an on-board backup control apparatus controls a first charge/discharge unit corresponding to a first power storage portion such as to supply charge current to the first power storage portion in a first state during a first period and perform constant voltage charging with respect to the first power storage portion during a second period following the first period. The adjustment unit controls a second charge/discharge unit corresponding to a second power storage portion such as to establish a second state with respect to the second power storage portion during the first period and supply charge current to the second power storage portion in a third state during the second period, charge current being suppressed in the second state compared to in the first state and being increased in the third state compared to in the second state.