Transformer Auxiliary Winding Circuit for Power Converter Switching
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Solution Overview
Problem
Existing electrical circuit arrangements for power converters lack flexibility and efficiency in performing multiple functions, often requiring multiple semiconductor switches or thyristors, which increases complexity and cost.
Innovation Solution
An electrical circuit with an auxiliary winding connected to the primary winding of a transformer, allowing a single switching device with anti-parallel thyristors to perform both short-circuiting and pre-charging functions, reducing the voltage level and component requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple semiconductor switches or thyristors are used to perform different functions (short-circuit protection, pre-charging), then the functional reliability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent applies the universality principle by designing a single switching device with anti-parallel thyristors that can perform multiple functions: short-circuit protection of the auxiliary winding and pre-charging of the capacitor. This multi-functional design eliminates the need for separate switching devices for each function, thereby reducing device complexity while maintaining functional reliability.
2Device complexity
If a single switching device is used to perform multiple functions, then the device complexity is reduced, but the voltage level and component requirements increase
Solution Approach 1:
The patent applies the intermediary principle by introducing a transformer with an auxiliary winding. The transformer acts as a mediator that couples the high-voltage primary winding to the low-voltage auxiliary winding. The switching device operates at the lower voltage level of the auxiliary winding, while the transformer handles the voltage transformation, thus reducing the voltage stress on the switching device components.
3Power
If the switching device operates at higher voltage level, then the electrical circuit performance is improved, but the component cost and dielectric strength requirements increase
Solution Approach 1:
The patent applies the dimensionality change principle by separating the voltage levels into different dimensions. The primary winding operates at the high voltage level required for electrical circuit performance, while the auxiliary winding provides a separate low-voltage dimension for the switching device operation. This dimensional separation allows the switching device to use lower-cost components with reduced dielectric strength requirements while the transformer ensures the high-voltage side maintains its performance.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides high flexibility and cost savings by enabling a single switching device to execute multiple functions, such as short-circuit protection and capacitor charging, with lower voltage and simpler component configurations.
Implementation Method 1
a transformer (12) with a primary winding (13) connected to an electric power grid (17) and a magnetically coupled secondary winding (14)
Implementation Method 2
a power converter (19) with a capacitor (20)
Data Source
Figure 1
Figure 2
AI summary
An electrical circuit (10) is described which includes a transformer (12) with primary winding (13) connected to the electric power grid (17) and secondary winding (14) connected to a power converter (19) with a capacitor (20). It includes a circuit arrangement (25) which is connected to the electrical circuit (10). The circuit arrangement (25) has a primary winding (13) coupled to the auxiliary winding (27), which is connected to a switching device (28).