Efficient Power Conversion for Multi-Device Systems
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Summary
Problems
Existing power conversion devices face challenges in efficiently transmitting power among three or more electric devices due to conflicting requirements that reduce power transmission efficiency and hinder cost reduction, downsizing, and weight reduction.
Innovation solutions
A power conversion device with a first and second smoothing circuit, a bridge circuit connected to the smoothing circuits, and a transformer with a controller that varies the duty ratio of the bridge circuit at a frequency higher than the cutoff frequencies of the smoothing circuits, allowing for simultaneous power exchange between the electric devices without individual transformers for each device.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If multiple full-bridge circuits and coils are provided for each electric device, then power transmission control among multiple devices is achieved, but device size, weight, and cost increase
Why choose this principle:
The patent merges multiple full-bridge circuits into a single shared full-bridge circuit that serves multiple electric devices. The transformer has multiple secondary coils that can be independently controlled through duty ratio modulation of the single full-bridge circuit, eliminating the need for separate full-bridge circuits for each device. This combining approach reduces the number of power conversion circuits while maintaining the capability to control power transmission among multiple devices independently.
Principle concept:
If multiple full-bridge circuits and coils are provided for each electric device, then power transmission control among multiple devices is achieved, but device size, weight, and cost increase
Why choose this principle:
The single full-bridge circuit is designed to perform multiple functions by serving different secondary coils of the transformer simultaneously. Each secondary coil can be independently controlled to connect to different electric devices, allowing the full-bridge circuit to adaptively serve multiple devices with different power requirements. The controller dynamically assigns the full-bridge circuit to different devices based on power transmission needs.
Application Domain
Data Source
AI summary:
A power conversion device with a first and second smoothing circuit, a bridge circuit connected to the smoothing circuits, and a transformer with a controller that varies the duty ratio of the bridge circuit at a frequency higher than the cutoff frequencies of the smoothing circuits, allowing for simultaneous power exchange between the electric devices without individual transformers for each device.
Abstract
A power conversion device includes: a first smoothing circuit connected to a first electric device; a second smoothing circuit connected to a second electric device; a first bridge circuit connected to the first smoothing circuit; a transformer having a primary side connected to a third electric device and a secondary side connected to the first bridge circuit and the second smoothing circuit; and a controller, wherein the controller varies a duty ratio of the first bridge circuit at a frequency higher than cutoff frequencies of the first and second smoothing circuits, controls a constant component of the duty ratio to control power exchange between the first and second electric devices, and controls a phase of a varying component of the duty ratio to control power exchange to and from the third electric device.