Synchronized DC-AC Inversion to Cut Switch Turn-On Losses
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Solution Overview
Problem
Existing power-conversion systems face inefficiencies due to asynchronous control between DC/DC converters and DC/AC inverters, leading to mismatched power flow and increased switch turn-on losses.
Innovation Solution
Implementing synchronized control of DC/DC converters and DC/AC inverters by aligning power provision and draw times, thereby bypassing the bus capacitor and minimizing switch turn-on losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If asynchronous control is used between DC/DC converter and DC/AC inverter, then independent control flexibility is maintained, but power flow mismatch and increased switch turn-on losses occur
Solution Approach 1:
The patent merges the control of DC/DC converter and DC/AC inverter into a unified synchronized control system. The controller coordinates the switching operations of both converters, aligning their power flow timing to occur simultaneously. This eliminates the power flow mismatch and reduces switch turn-on losses that occur with asynchronous control, while still maintaining operational flexibility through coordinated control strategies.
2Stability of the object's composition
If traditional DC-link capacitor is used for power buffering, then power flow stability is ensured, but system complexity and component count increase
Solution Approach 1:
The patent extracts and eliminates the traditional large DC-link capacitor from the power conversion system. By implementing synchronized control where the DC/DC converter and DC/AC inverter exchange power directly at matched timing, the system removes the need for substantial energy buffering components. This reduces system complexity, component count, and cost while maintaining power flow stability through coordinated switching operations.
3Productivity
If synchronized control is implemented between DC/DC converter and DC/AC inverter, then power conversion efficiency is improved, but control complexity increases
Solution Approach 1:
The patent implements a feedback-based synchronized control mechanism where the controller monitors the operating states of both DC/DC converter and DC/AC inverter. Based on real-time feedback information, the controller dynamically adjusts switching signals to maintain synchronized power flow. This feedback approach enables efficient power conversion while managing control complexity through adaptive, state-dependent control strategies rather than rigid predetermined sequences.
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
Enhances power-conversion efficiency by ensuring equal power exchange between converters and inverters, reducing capacitor size and potentially omitting filtering inductors, and simplifying control signals.
Implementation Method 1
a transformer having a primary winding coupled to the converter switches and a secondary winding coupled to the inverter switches
Data Source
AI summary
Aspects of the disclosure include a power-conversion system including an input, an output, a DC/DC converter coupled to the input, a DC/AC inverter coupled to the DC/DC converter and coupled to the output, and at least one controller coupled to the DC/DC converter and the DC/AC inverter, the at least one controller being configured to control the DC/DC converter to draw input power from the input and provide converted power to the DC/AC inverter, and control the DC/AC inverter to receive the converted power and provide output power to the output in synchronization with the DC/DC converter drawing the input power from the input.