Power Switching Circuit Zero-Voltage Transfer Control
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Solution Overview
Problem
Automatic transfer switches currently consume significant electric energy to remain ready for power switching, leading to inefficiencies and increased costs.
Innovation Solution
A power switching device comprising a primary and backup power source, coupled with a power switching circuit that includes switching modules and a control module, utilizing latching and non-latching relays and bidirectional thyristors to efficiently switch between power sources, minimizing energy consumption by disconnecting and reconnecting at zero voltage and controlling the relays and thyristors to manage power transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the automatic transfer switch remains continuously ready to switch power, then the switching capability is maintained, but significant electric energy is consumed
Solution Approach 1:
The system uses periodic monitoring instead of continuous operation. The control module periodically checks the status of the primary power source and only activates switching components when a failure is detected, rather than maintaining constant readiness. This converts continuous energy consumption into periodic, event-driven operation.
Solution Approach 2:
The patent extracts the power consumption function from the switching readiness function. By separating the monitoring function (low power) from the actual switching operation (high power), the system can maintain readiness capability while minimizing energy consumption by keeping switching components inactive until needed.
2Speed
If rapid switching between power sources is achieved, then power supply continuity is improved, but energy loss during switching increases
Solution Approach 1:
The control module performs preliminary detection of power source status before switching is needed. By monitoring and identifying failures in advance, the system can prepare for switching without rushing the actual power transfer, allowing energy-efficient switching at optimal moments rather than forced rapid switching.
Solution Approach 2:
The control module acts as an intermediary that manages the timing and execution of switching operations. It coordinates between the primary and backup power sources, ensuring switching occurs at appropriate moments (such as when voltage is zero or stable) to minimize energy loss, rather than direct instantaneous switching.
Data Source
AI summary
A power switching device includes a primary power source, a backup power source, and a power switching circuit, and the power switching circuit can switch rapidly between the two or more power sources. The power switching circuit includes a first switching module, a second switching module, and a control module. The first switching module includes first through fourth relays, and first through fourth driving units. The first switching module also includes a first bidirectional thyristor and a second bidirectional thyristor. A power switching circuit is also provided.