Power Storage Device Staggered Switching Reverse Flow
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Solution Overview
Problem
Existing power storage devices experience reverse flow of electric power from the power storage unit to the power supply due to individual differences in switch performance, leading to inefficiencies when both switches are in an ON state during transitions between steady and anomaly states.
Innovation Solution
A power storage device configuration with a first circuit that forms a discharge path for backup power supply and a second circuit with a blocking path to prevent reverse flow, where the switching of first and second switches is staggered to prevent simultaneous ON states, using a delay circuit or control circuit to generate a time difference between their switching timings.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both the first switch and second switch are used to enable power supply switching between steady state and anomaly state, then power supply reliability is improved, but reverse flow of electric power occurs due to individual differences in switch performance
Solution Approach 1:
The control circuit turns off the second switch before turning on the first switch during state transitions. This preliminary action ensures that the blocking path is established before the discharge path becomes active, preventing reverse power flow caused by timing differences in switch response. The control circuit proactively manages the switching sequence to eliminate the energy loss issue before it occurs.
2Device complexity
If simple switch configuration is used for power supply switching, then device complexity is reduced, but switching timing control becomes difficult leading to simultaneous ON states
Solution Approach 1:
The control circuit monitors the states of both switches and their response characteristics, using this feedback information to precisely control the switching sequence. By detecting when each switch actually changes state (accounting for individual performance differences), the control circuit ensures the second switch is fully off before the first switch turns on, preventing simultaneous ON states while maintaining reliable power supply switching.
Data Source
AI summary
A power storage device includes an input terminal, an output terminal, a first circuit, and a second circuit. The input terminal is to be electrically connected to a power supply. The output terminal is to be electrically connected to a load. The first circuit and the second circuit are electrically connected in parallel. Each of the first circuit and the second circuit are disposed between the input terminal and the output terminal. The first circuit includes a power storage unit and a discharge path that allows a discharge current from the power storage unit to flow toward the output terminal. The second circuit includes a blocking path that prevents the discharge current from flowing toward the input terminal.