Power Supply Controller Relay Timing Optimization
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Solution Overview
Problem
In power supply systems using parallel connections of secondary batteries with relays, simultaneous relay activation leads to excessive surge currents, increasing output current and posing a risk of overcurrent, which existing solutions attempt to mitigate by adding additional relays, thereby increasing costs.
Innovation Solution
Implementing a power supply control apparatus that sets a time difference in the ON/OFF timings of relays to manage surge currents without the need for additional relays, using a surge current calculating device to determine optimal delay times based on the amplitude and frequency of surge currents, thereby preventing overcurrent while reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If two relays are connected in parallel at the output of each secondary battery to prevent overcurrent, then overcurrent protection is improved, but device complexity and cost increase
Solution Approach 1:
The control device calculates surge currents in advance before relay switching, determines the appropriate delay time based on these calculations, and then controls the relay switching timing accordingly. This preliminary calculation and planning prevents overcurrent without requiring additional relays.
Solution Approach 2:
The invention changes the timing parameter of relay switching by introducing a calculated delay time. Instead of simultaneous switching or using more relays, the system adjusts the time parameter to stagger relay activation, thereby controlling surge current effects.
2Speed
If relays are switched on simultaneously, then power supply response speed is improved, but overcurrent occurs due to surge current superposition
Solution Approach 1:
The control device performs preliminary calculation of surge currents and determines optimal delay timing before executing relay switching. This advance preparation enables the system to achieve fast response while avoiding overcurrent by pre-planning the switching sequence.
Solution Approach 2:
The control device calculates surge currents based on battery states and uses this feedback information to determine appropriate delay times for relay switching, creating a closed-loop control system that balances speed and safety.
Data Source
AI summary
A power supply device (1) includes a parallel connection of a plurality of series circuits each including a secondary battery (11A, 11B) and a relay (12A, 12B) connected in series with the secondary battery. A control apparatus for controlling ON/OFF timings of the relays (12A, 12B) includes a control device (2) to set a time difference between the ON/OFF timings of the relays (12A, 12B) to control the supply of power at optimum timings.