Transformer-Coupled EV Charging With AC Power Difference Compensation
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Solution Overview
Problem
Existing electric vehicle charging systems face challenges in reducing hardware and space costs while ensuring high power output, maintaining grid quality, and minimizing load on the public power grid.
Innovation Solution
A charging device comprising a transformer, a charger, and an energy regulator, where the energy regulator compensates power differences by controlling the AC side current, performing power factor correction and harmonic compensation to achieve high power output with reduced costs and space requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high power output is achieved in charging systems, then charging speed and efficiency are improved, but hardware costs and space requirements increase
Solution Approach 1:
The patent combines the energy storage unit with the charging device into an integrated system. The energy storage unit shares physical space and control infrastructure with the charging components, reducing overall hardware costs and space requirements while maintaining high power output capability.
Solution Approach 2:
The energy storage unit pre-stores electrical energy before charging sessions. This preliminary energy preparation allows the charging system to deliver high power output without requiring proportionally larger power grid connections or larger transformer capacities, thereby reducing hardware costs and space.
2Productivity
If high power charging is implemented, then charging efficiency is improved, but the load on the public power grid increases
Solution Approach 1:
The energy storage unit pre-charges during periods of low grid demand or off-peak hours, storing energy before the actual charging session. This preliminary energy accumulation allows high-power charging to occur with minimal additional load on the public power grid during peak charging times.
Solution Approach 2:
The system recovers and stores excess electrical energy in the energy storage unit during low-demand periods. This recovered energy is then utilized during high-power charging sessions, effectively discarding the need for continuous high grid load and improving overall energy utilization efficiency.
3Reliability
If power factor correction and harmonic compensation are added, then grid connection quality is improved, but device complexity increases
Solution Approach 1:
The energy storage unit is designed to perform multiple functions simultaneously: energy storage, power factor correction, and harmonic compensation. By making the energy storage unit multi-functional, the patent avoids adding separate dedicated devices for each function, thereby improving grid connection quality without significantly increasing device complexity.
Solution Approach 2:
The patent merges the power factor correction and harmonic compensation functions into the existing energy storage unit control system. This integration allows the same hardware and control infrastructure to handle multiple power quality issues, reducing overall system complexity while improving grid connection reliability.
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
The solution enables high power output with reduced hardware and space costs, ensures grid quality, and minimizes the load on the public power grid, ensuring stable and efficient operation of high power charging equipment.
Implementation Method 1
a transformer, a charger, and an energy regulator; the primary winding of the transformer is connected to the power distribution network
Data Source
AI summary
The present disclosure provides a charging device and a charging control method, and the device includes a transformer, a charger, an energy regulator, and a controller; the primary winding of the transformer is connected to the power distribution network, the power distribution network provides a first input power for the charging device; the secondary winding of the transformer is connected to an AC side of the charger and the AC side of the energy regulator respectively; the power required on the AC side of the charger is a second input power; the controller is connected to the energy regulator to control the AC side current of the energy regulator, so as to compensate the power difference between the second input power and the first input power.