UPS Bypass Circuit Semiconductor Switch Control
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Solution Overview
Problem
Conventional uninterruptible power supplies with bypass circuits are complex due to the inclusion of both semiconductor and mechanical switches, leading to delays in switching operations and increased configuration complexity.
Innovation Solution
An uninterruptible power supply design that eliminates the mechanical switch by using a semiconductor switch with a controller and signal generator to continuously drive the semiconductor switch during bypass operation, reducing configuration complexity and maintaining the on-state of the semiconductor switch without the need for a mechanical switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If both a semiconductor switch and a mechanical switch are provided in the bypass circuit, then the AC power can be supplied reliably from the bypass circuit to the load, but the configuration of the uninterruptible power supply becomes complex
Solution Approach 1:
The patent replaces the mechanical switch with a semiconductor switch in the bypass circuit. The semiconductor switch is controlled by a control signal generated from the abnormality detection signal, enabling the bypass circuit to supply AC power to the load without requiring a mechanical switch. This substitution eliminates the complexity associated with mechanical switches while maintaining the reliability of power supply during abnormal conditions.
2Device complexity
If a mechanical switch is used in the bypass circuit, then the configuration is simpler, but it takes time for the switch to turn on causing delays in power supply
Solution Approach 1:
The patent replaces the mechanical switch with a semiconductor switch that can be turned on rapidly without the mechanical delay inherent in conventional switches. The semiconductor switch responds immediately to the control signal generated from the abnormality detection, eliminating the time delay associated with mechanical switch operation while keeping the configuration relatively simple.
3Reliability
If the semiconductor switch is turned on until the mechanical switch is reliably turned on, then the switching is reliable, but the semiconductor switch remains on longer than necessary increasing power loss
Solution Approach 1:
The patent uses the abnormality detection signal to generate the control signal for the semiconductor switch. When the abnormality detection signal indicates that the converter and inverter are abnormal, the control signal is generated to turn on the semiconductor switch. When the abnormality is resolved, the control signal is cancelled, turning off the semiconductor switch. This feedback mechanism ensures the semiconductor switch remains on only as long as necessary, reducing power loss while maintaining switching reliability.
Data Source
AI summary
In an uninterruptible power supply, a signal generator generates a semiconductor switch drive signal for driving a semiconductor switch and continuously generates the semiconductor switch drive signal while AC power is being supplied via a bypass circuit.