Multi-Transformer DC Converter for Flexible Power Exchange
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Solution Overview
Problem
Existing converter apparatuses can only output power to two other voltages based on an arbitrary selected voltage, but not to one voltage based on two arbitrarily selected voltages.
Innovation Solution
A converter apparatus with multiple transformers and switching circuits, along with a control unit that executes phase control and power conversion between three or four DC power supplies, allowing power exchange between any combination of the supplies by controlling phase differences and magnitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional DC-DC converter with a single transformer and multiple main circuits is used, then power can be output to two other voltages based on an arbitrary selected voltage, but it is not possible to output power to one voltage based on two arbitrarily selected voltages
Solution Approach 1:
The converter apparatus divides the power conversion function into multiple independent switching circuits (first, second, and third switching circuits), each capable of independent on/off control. This segmentation allows any combination of power supplies to serve as input or output, enabling flexible bidirectional power exchange between multiple DC power supplies with different voltages
Solution Approach 2:
Each switching circuit is designed with universal functionality to handle multiple operating modes. The switching circuits can operate in bidirectional power conversion mode, allowing any DC power supply to serve as either input or output depending on control signals, thus achieving multi-functional power exchange capability
2Adaptability or versatility
If multiple switching circuits with full bridge configuration are used to enable flexible power exchange, then power can be freely exchanged between any combination of power supplies, but the device complexity increases
Solution Approach 1:
The converter apparatus employs dynamic on/off control of switching elements within each switching circuit through independent control signals. This dynamic control allows the system to adapt its configuration in real-time, enabling any combination of power supplies to exchange power bidirectionally while maintaining a relatively fixed physical structure
Solution Approach 2:
The converter apparatus uses DC-DC conversion circuits as intermediary components between different DC power supplies. These intermediary circuits facilitate controlled power transfer between power supplies with different voltages, enabling flexible power exchange while isolating the complexity of voltage matching from the overall system architecture
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 flexible and independent power control between multiple DC power supplies, allowing power to be freely exchanged between any combination of them, enhancing power management and efficiency.
Implementation Method 1
a first transformer 2 in which a pair of first windings 2a and 2b that are magnetically coupled are formed
Data Source
AI summary
A converter apparatus includes: a first transformer with two windings; a first full-bridge circuit with four switches, DC input/output units connected to a first DC power supply, and AC input/output units connected via an inductor to one winding of the first transformer; a second full-bridge circuit with four switches, DC input/output units connected to a second DC power supply, and AC input/output units connected via an inductor to another winding of the first transformer; a second transformer with two windings, one being connected via an inductor to the AC input/output units of the first circuit; a third full-bridge circuit with four switches, DC input/output units connected to a third DC power supply, and AC input/output units connected via an inductor to another winding of the second transformer; and a control unit for controlling the switches to supply power between the first to third DC power supplies.