Flying-Capacitor Power Conversion Circuit with Adjustable Voltage Gain
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Solution Overview
Problem
Existing power conversion circuits with non-isolated resonant topology have a fixed voltage gain, limiting their applications due to the inability to adjust the ratio of output voltage to input voltage according to practical requirements.
Innovation Solution
A power conversion circuit with an adjustable voltage gain is achieved through a configuration that includes a first and second terminal, switching conversion units, a flying capacitor, and a magnetic element with specific winding interactions, allowing for adjustable turn ratios and operational periods to control voltage gain.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a fixed voltage gain is used in the resonant power conversion circuit, then the circuit structure is simple, but the adaptability to different applications is limited
Solution Approach 1:
The patent applies the dynamics principle by making the voltage gain adjustable through variable parameters. Specifically, the voltage gain can be changed by adjusting the duty cycle of the switching converter or by changing the turns ratio of the magnetic element windings. This allows the circuit to adapt to different application requirements while maintaining a relatively simple basic structure, resolving the contradiction between adaptability and complexity.
2Adaptability or versatility
If the voltage gain is adjusted by changing the turns ratio of windings, then the voltage gain is adjustable, but the device complexity increases due to additional winding configurations
Solution Approach 1:
The patent applies the universality principle by designing a magnetic element where a single set of windings can serve multiple functions. The first and second windings on the same magnetic core can operate in different turns ratio configurations to provide various voltage gain values. This multi-functional design allows voltage adjustment without requiring separate winding sets for each gain value, thereby reducing overall device complexity while maintaining adjustability.
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 adjustable voltage gain expands the applications of the power conversion circuit by enabling flexible voltage ratio adjustment, enhancing energy transfer efficiency and power density while reducing switching losses.
Implementation Method 1
The magnetic element includes two first windings and a second winding. The two first windings and the second winding interact with each other to result in an electromagnetic coupling effect.
Data Source
AI summary
A power conversion circuit includes a first terminal, a second terminal, a first switching conversion unit, a second switching conversion unit, a flying capacitor and a magnetic element. The first switching conversion unit includes a first switch and a third switch. The second switching conversion unit includes a second switch and a fourth switch. The magnetic element includes two first windings and a second winding. A first one of the two first windings is serially connected between the flying capacitor and the second terminal. A second one of the two first windings is serially connected between the second switch and the second terminal. The second winding is serially connected with the flying capacitor and the first one of the two first windings. A turn ratio between the second winding, the first one of the two first windings and the second one of the two first windings is N:1:1.