Virtual DC Voltage Generator Circuit Without Smoothing Capacitors
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Solution Overview
Problem
Conventional power conversion systems require smoothing capacitors to connect DC circuits, which can be bulky and inefficient, especially when handling bidirectional power conversion between DC and AC systems.
Innovation Solution
A power conversion system that includes a third circuit with a transformer and switching elements, generating a virtual DC voltage without the need for smoothing capacitors, allowing multiple circuits to be connected on the DC side by utilizing the flat range of the output voltage waveform.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a smoothing capacitor is used to connect DC circuits, then the circuits can be connected on the DC side, but the system size increases and efficiency decreases
Solution Approach 1:
The invention extracts and eliminates the smoothing capacitor from the DC circuit connection system. By using a virtual DC voltage generator that creates a flat-range voltage waveform, the patent removes the need for bulky smoothing capacitors while maintaining the ability to connect multiple DC circuits, thereby reducing system size without sacrificing adaptability
Solution Approach 2:
The invention introduces a virtual DC voltage generator as an intermediary component between DC circuits. This generator creates a virtual DC voltage with a flat-range waveform that serves as an effective replacement for traditional smoothing capacitors, enabling DC circuit connections without requiring large capacitor components
2Adaptability or versatility
If a smoothing capacitor is used to connect DC circuits, then the circuits can be connected on the DC side, but energy efficiency decreases
Solution Approach 1:
The invention extracts and eliminates the smoothing capacitor from the DC circuit connection system. By using a virtual DC voltage generator that creates a flat-range voltage waveform, the patent removes the need for bulky smoothing capacitors while maintaining the ability to connect multiple DC circuits, thereby reducing system size without sacrificing adaptability
Solution Approach 2:
The invention changes the voltage waveform parameters by generating a flat-range waveform with specific rising, falling, and flat portions. This parameter change enables the virtual DC voltage generator to maintain stable DC voltage without requiring energy-intensive smoothing capacitors, thereby improving energy efficiency while maintaining circuit connectivity
3Power
If conventional power conversion is used, then power can be converted between DC and AC, but the system requires bulky smoothing capacitors
Solution Approach 1:
The invention introduces a virtual DC voltage generator as an intermediary component between DC circuits. This generator creates a virtual DC voltage with a flat-range waveform that serves as an effective replacement for traditional smoothing capacitors, enabling DC circuit connections without requiring large capacitor components
Solution Approach 2:
The invention uses periodic switching action in the virtual DC voltage generator to create the flat-range voltage waveform. By periodically switching the voltage output through controlled rising, falling, and flat ranges, the system achieves effective DC voltage generation without requiring bulky passive components like smoothing capacitors
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
Enables efficient bidirectional power conversion without the need for smoothing capacitors, reducing system size and improving efficiency by using the flat range of the output voltage to generate a stable DC voltage, thus allowing multiple circuits to be connected on the DC side.
Implementation Method 1
The third circuit includes a switching element and a transformer electrically connected to the switching element. The third circuit is configured to provide an output voltage across a secondary winding of the transformer via the switching element and the transformer.
Data Source
AI summary
A power conversion system according to the present disclosure includes a first circuit, a second circuit, and a third circuit. A first internal terminal, a second internal terminal, and a third internal terminal are electrically connected to the same connection unit. The third circuit provides an output voltage across a secondary winding of a transformer via a switching element and the transformer. The secondary winding is electrically connected to the third internal terminal. The output voltage has a waveform including a rising range in which the output voltage changes from a first potential to a second potential, a falling range in which the output voltage changes from the second potential to the first potential, and a flat range in which the output voltage is maintained at either the first potential or the second potential.