Power Converter Voltage Balancing via Intermediary Capacitor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The stability of power conversion devices, such as Flyback converters, is compromised due to varying parasitic capacitance in high-voltage transistors, leading to unstable voltage drops across electrical switches, limiting component selection flexibility.
Innovation Solution
A power conversion device design featuring a transformer with balanced windings and capacitors, where voltage drops across switches and capacitors are balanced, ensuring stable operation without modifying the internal structures of the switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If high-voltage transistors are used to withstand high voltage in series switches, then the voltage withstanding capability is improved, but the parasitic capacitance varies according to semiconductor process conditions, resulting in unstable voltage drops and reduced circuit stability
Solution Approach 1:
The patent introduces a balanced capacitor as an intermediary component connected between the midpoint of the series high-voltage transistor switches and the transformer primary winding. This balanced capacitor compensates for voltage drops caused by varying parasitic capacitance in the high-voltage transistors, thereby maintaining stable operation of the circuit while preserving the voltage withstanding capability of the series switch configuration.
2Strength
If high-voltage transistors are used in the power conversion device, then the voltage withstanding capability is improved, but the number of semiconductor manufacturers that can supply such components is limited, reducing component selection flexibility
Solution Approach 1:
The balanced capacitor serves as a mediator that enables the use of high-voltage transistors from limited manufacturers by compensating for their varying parasitic capacitance characteristics. This allows designers to select from available high-voltage transistor options without being constrained by the need for perfectly matched components, thereby improving component selection flexibility while maintaining voltage withstanding capability.
3Reliability
If the internal structures of electrical switches are modified to balance voltage drops, then the circuit stability is improved, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
Instead of modifying the internal structures of the electrical switches, the patent introduces an external balanced capacitor as a mediator component. This approach achieves voltage drop balancing and circuit stability improvement without increasing the complexity of the switch internal structures, thereby avoiding increased manufacturing difficulty while maintaining reliability.
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
This design stabilizes the power conversion device and enhances component selection flexibility by balancing voltage drops across switches and capacitors, improving overall performance.
Implementation Method 1
the transformer uses the energy to provide an output voltage for the load
Implementation Method 2
voltage drops across the at least one first voltage-stabilizing capacitor, the at least one second voltage-stabilizing capacitor, the first winding, and the second winding balance each other to balance voltage drops across the first electrical switch and the second electrical switch
Data Source
AI summary
A power conversion device includes a transformer, a first electrical switch, a second electrical switch, at least one balanced capacitor, at least one voltage-stabilizing capacitor, and a power-providing circuit. The first electrical switch, the second electrical switch, the balanced capacitor, and the voltage-stabilizing capacitor are connected to the primary side of the transformer, and the secondary side of the transformer is connected to the power-providing circuit. The primary side has a first terminal, a second terminal, and a third terminal therebetween. The first electrical switch and the second electrical switch are respectively connected to a high-voltage terminal and a low-voltage terminal, and the voltage-stabilizing capacitor is connected between the two voltage terminals. One end of the balanced capacitor is connected to the third terminal, and another end of the balanced capacitor is connected to the voltage-stabilizing capacitor or the voltage terminals.