Converter With Segmented Switching Circuits For Non-Integer Voltage Ratios
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Solution Overview
Problem
Conventional converters face inefficiencies in achieving non-integer voltage conversion ratios, leading to excessive winding losses and difficulty in designing resonant parameters due to the need for adjusting transformer turns ratios or switching frequencies.
Innovation Solution
A converter design with a transformer turns ratio of N:1, where N is a positive integer, achieves a non-integer voltage conversion ratio by adjusting the connection arrangement of the switching circuit at the high voltage side, maintaining efficient winding losses and aligning switching frequency with resonant frequency for optimized resonant parameter design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the turns ratio of the transformer is adjusted to achieve a non-integer voltage conversion ratio (N+0.5), then the voltage conversion requirement is met, but the total number of turns increases to (2N+3), resulting in excessive winding losses and reduced efficiency
Solution Approach 1:
The patent divides the transformer into two separate windings with integer turns ratios (N:1), and achieves the non-integer voltage conversion ratio by segmenting the control function to the switching circuit. The switching circuit is divided into two independent switching circuits that can be controlled separately, allowing the voltage conversion ratio to be adjusted without changing the physical turns ratio of the transformer.
Solution Approach 2:
The patent introduces a switching circuit as an intermediary between the input and output of the transformer. This switching circuit acts as a mediator that adjusts the effective voltage conversion ratio by controlling the switching timing and duty cycle, rather than directly changing the transformer's physical turns ratio. The switching circuit enables flexible voltage conversion while keeping the transformer structure simple and efficient.
2Adaptability or versatility
If the switching frequency is adjusted away from the resonant operating point to achieve a non-integer voltage conversion ratio, then the voltage conversion requirement is met, but the resonant parameters become difficult to design and the inductance of the resonant inductor increases, reducing the magnetizing inductance of the transformer
Solution Approach 1:
The patent makes the voltage conversion ratio dynamically adjustable through the switching circuit's duty cycle control, rather than requiring a fixed non-integer turns ratio. By dynamically controlling the switching timing and duty cycle of the two switching circuits, the system can achieve different voltage conversion ratios including non-integer values, while maintaining optimal resonant operating conditions and avoiding the need to redesign resonant parameters for each conversion ratio.
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 approach reduces winding losses and increases magnetizing inductance, enhancing the conversion efficiency of the converter while allowing for convenient resonant parameter optimization.
Implementation Method 1
The transformer is between the first side switching circuit and second side switching circuit. The transformer includes a first side winding coupled to the first side switching circuit and a second side winding coupled to the second side switching circuit.
Data Source
AI summary
A converter includes a first end, a second end, a first side and a second side switching circuits and a transformer. The first end includes a first positive terminal and a first negative terminal. The second end includes a second positive terminal and a second negative terminal. The first side switching circuit is coupled to the first end and includes a first bridge arm and a second bridge arm. Two terminals of the first bridge arm are coupled to the first positive terminal and the first negative terminal respectively. Two terminals of the second bridge arm are coupled to the first positive terminal and the second positive terminal respectively. The transformer includes a first side winding coupled to the first side switching circuit and a second side winding coupled to the second side switching circuit. The turns ratio of the first side winding and the second side winding is N:1.