Transformer Power Conversion Circuit With Variable Voltage Gain
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Solution Overview
Problem
Conventional buck circuits have a fixed gain ratio of input to output voltage, limiting their applicability due to the inability to vary the voltage at the connection point between switches, which restricts their use to specific applications.
Innovation Solution
A power conversion circuit with a variable gain ratio is achieved by adjusting the turns ratio of the transformer's windings, allowing the circuit to be applied in various applications with different gain ratio requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional buck circuit with fixed capacitor capacitance is used, then the circuit structure is simple, but the gain ratio of input to output voltage cannot be changed, limiting applicability
Solution Approach 1:
The patent applies the dynamics principle by making the capacitor capacitance variable rather than fixed. The capacitor is constructed with adjustable parallel plate structures that can change their effective capacitance value dynamically, allowing the buck circuit to adapt different gain ratios for different application requirements while maintaining a relatively simple overall circuit topology.
Solution Approach 2:
The patent implements parameter changes by modifying the capacitance parameter of the capacitor in the buck circuit. By changing the capacitance value through adjustable plate configurations, the circuit can achieve different voltage gain ratios, thereby improving applicability without significantly increasing device complexity.
2Adaptability or versatility
If the capacitance of the capacitor in the buck circuit is fixed, then the circuit is easy to manufacture, but the voltage at the connection point between switches cannot be varied, restricting the gain ratio to a single value
Solution Approach 1:
The capacitor is designed with dynamic adjustability, allowing its capacitance to be changed after manufacturing. The adjustable plate structure enables the same manufactured component to serve multiple gain ratio requirements, combining manufacturing simplicity with operational flexibility.
Solution Approach 2:
The capacitor is designed to perform multiple functions by varying its capacitance value. A single capacitor component can support different gain ratios (e.g., 4:1, 3:1, 2:1) by adjusting its effective capacitance, making the buck circuit universally applicable to different voltage conversion requirements without requiring multiple specialized components.
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 power conversion circuit can now be used in a wide range of applications by flexibly adjusting the gain ratio of input to output voltage, enhancing its applicability and adaptability.
Implementation Method 1
The transformer includes a first winding, a second winding and a third winding. The first winding is coupled between the first and third connection points, and the second and third windings are coupled between the second and fourth connection points.
Data Source
AI summary
The present disclosure provides a power conversion circuit including input positive and negative terminals, output positive and negative terminals, an input inductor, two bridge arms, a transformer, an output capacitor and an auxiliary capacitor. The input and output negative terminals are connected. A first terminal of the input inductor is coupled to the input positive terminal. Each bridge arm includes three switches connected in series and two connection points between the switches. The winding of the transformer is coupled in series between the connection points of the two bridge arms, and two windings of the transformer are connected and form a connection point coupled to the output positive terminal. Two terminals of the output capacitor are electrically connected to the output positive and negative terminals respectively. Two terminals of the auxiliary capacitor are electrically connected to a second terminal of the input inductor and the output terminal respectively.