Semiconductor Transfer Switch Circuit for Seamless AC/DC Power Switching
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Solution Overview
Problem
Existing power supply systems struggle with slow mechanical switching times in automatic transfer switches (ATS) and inefficiencies in ATS+on-line UPS systems, which are not suitable for high continuity of system power supply and are not adaptable to both AC and DC power sources and loads, leading to transient voltage changes and inefficiencies.
Innovation Solution
A quick automatic transfer switch device with semiconductor switches and a control circuit that enables seamless switching between AC and DC power sources by controlling switch elements and a power source transfer circuit to maintain zero power loss and adapt to varying power source states, ensuring compatibility with both AC and DC loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If mechanical switches are used in automatic transfer switches (ATS), then the device structure is simple and reliable, but the switching time is slow and causes transient voltage changes
Solution Approach 1:
The patent replaces mechanical switches with semiconductor switches (IGBTs or MOSFETs) to eliminate mechanical switching delays and transient voltage changes. The semiconductor switches enable electronic-level switching speeds while maintaining system reliability through controlled gate signals from the control circuit.
Solution Approach 2:
The patent changes the switching mechanism from mechanical movement to electronic parameter control. By controlling the gate-source voltage of semiconductor switches, the system achieves rapid on/off transitions without mechanical wear or contact bounce, directly improving switching speed while reducing complexity.
2Reliability
If ATS+on-line UPS system is used, then power supply continuity is improved, but system complexity increases and efficiency decreases
Solution Approach 1:
The patent merges the functions of ATS and on-line UPS into a single integrated circuit. The power source transfer circuit combines switching operations and voltage regulation in one unit, eliminating the need for separate ATS and UPS devices while maintaining power supply continuity and improving overall efficiency.
Solution Approach 2:
The power source transfer circuit is designed to perform multiple functions: switching between different power sources, regulating output voltage, and providing seamless transfer. This multi-functional design replaces multiple dedicated devices, reducing system complexity while maintaining reliability.
3Adaptability or versatility
If traditional ATS system is used, then AC power source compatibility is achieved, but adaptability to DC power sources and loads is limited
Solution Approach 1:
The patent designs the power source transfer circuit to universally handle both AC and DC power sources and loads. The circuit can detect input power type and adjust switching operations accordingly, enabling seamless operation with either AC or DC inputs without requiring separate systems, thus improving adaptability while maintaining efficiency.
Data Source
AI summary
There is provided a quick automatic transfer switch device and an operating method thereof, including: a first power source input end; a second power source input end; output end; a first switch element coupled between the first power source input end and a third switch element; a second switch element coupled between the second power source input end and the third switch element; the third switch element coupled between the first and second switch elements and the output end; a fourth switch element coupled with the first power source input end and the second power source input end and coupled to a power source transfer circuit; the power source transfer circuit coupled with the fourth switch element and the output end; and a control circuit.