Power Converter Transformer Segmentation for Battery Current Sharing
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Solution Overview
Problem
In power conversion systems using multiple batteries in parallel, current sharing is challenging due to varying internal resistance and capacity, leading to inefficient discharge and overheating issues with existing DC converters.
Innovation Solution
A power conversion device and system that utilize a transformer with a primary and secondary winding, where the secondary winding is connected in series with the power supply and load, allowing the switch to generate a second voltage based on the primary voltage, controlled by a control circuit to maintain equal output voltages across multiple devices, reducing component costs and size while improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DC converter is connected to the output of each battery to achieve current sharing, then current sharing is improved, but system size increases and conversion efficiency decreases
Solution Approach 1:
The invention divides the power conversion function into two parts: the DC converter handles only the voltage difference (small portion), while the transformer handles the majority of voltage conversion. This segmentation allows each component to be optimized for its specific function, reducing overall system size while maintaining current sharing capability.
Solution Approach 2:
The invention introduces a transformer as an intermediary component between the DC converter and the load. The transformer assists the DC converter in voltage conversion, enabling the DC converter to operate at lower power levels and improving overall conversion efficiency while maintaining current sharing.
2Reliability
If a DC converter is connected to the output of each battery to achieve current sharing, then current sharing is improved, but conversion efficiency decreases and overheating occurs
Solution Approach 1:
The power conversion task is segmented between the DC converter and transformer, with the DC converter handling only the voltage difference. This reduces the power processing burden on the DC converter, minimizing energy losses and overheating while preserving current sharing functionality.
Solution Approach 2:
The invention changes the operating parameters of the DC converter by having it handle only the voltage difference rather than the full output voltage. This parameter change reduces the converter's power dissipation and improves efficiency while maintaining current sharing through coordinated control.
3Power
If a DC converter is used for high-power discharge, then power output is improved, but component specification requirements increase and system size increases
Solution Approach 1:
The transformer acts as an intermediary that handles the majority of voltage conversion for high-power discharge applications. This allows the DC converter to use smaller, lower-specification components while still achieving high power output through the combined system.
Solution Approach 2:
The high-power voltage conversion function is segmented between the DC converter and transformer, with the transformer handling the bulk of the voltage transformation. This segmentation reduces the specification requirements for the DC converter components while maintaining high power output capability.
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 configuration reduces component costs, system size, and overheating, while enhancing conversion efficiency and extending discharge time by only converting the voltage difference between the supply and target output, ensuring consistent current sharing across batteries.
Implementation Method 1
The transformer includes a primary winding and a secondary winding. The primary winding is connected to the switch in series and configured to receive the first voltage... The secondary winding is connected with the power supply and the load in series... The switch is configured to switch according to the control signal, so that the secondary winding generates a second voltage according to the voltage of the primary winding
Data Source
AI summary
A power conversion device includes a power supply, a converter, a current detection circuit, and a control circuit. The power supply includes positive and negative terminals. The converter includes a primary side and a secondary side. The converter is configured to output a first current to a load. The primary side is electrically connected to the positive terminal and the negative terminal of the power supply in parallel. The secondary side is electrically connected to the positive terminal of the power supply and the load in series. The current detection circuit is coupled between the secondary side and the load, and is configured to detect the first current to output a current detection signal. The control circuit is coupled to the current detection circuit for outputting a control signal to the converter according to the current detection signal and a reference current signal.