Motor Winding Boost Charging for 500V-to-800V EV Batteries
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Solution Overview
Problem
Current fast direct current charging piles with an output voltage of 500 V cannot directly charge electric vehicles equipped with 800 V high-voltage power batteries, hindering charging speed improvements and user experience.
Innovation Solution
A charging system that performs boost conversion on the 500 V power supply voltage to achieve an output voltage of 960 V or higher, enabling effective charging of the high-voltage power battery by utilizing the motor windings and MCU in the electric vehicle to create a voltage conversion circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a 500V charging pile is used to charge an 800V high-voltage power battery, then the charging infrastructure compatibility is maintained, but the charging voltage is insufficient to meet the battery requirements
Solution Approach 1:
The patent changes the voltage parameter by using the motor winding as an inductor in a boost conversion circuit. The MCU controls the switching of the voltage conversion circuit to transform the 500V input voltage into a higher voltage (960V or above) that meets the 800V high-voltage power battery charging requirements, thus resolving the voltage mismatch problem
Solution Approach 2:
The patent introduces a voltage conversion circuit as an intermediary between the 500V charging pile and the 800V power battery. This circuit uses the motor winding and switching devices to perform boost conversion, acting as a mediator that transforms incompatible voltage levels into compatible ones for effective charging
2Adaptability or versatility
If a dedicated voltage conversion device is added to enable 500V to 800V conversion, then the charging voltage compatibility is improved, but the system complexity and cost increase
Solution Approach 1:
The patent makes the motor winding serve multiple functions: it acts as both the motor component and the inductor in the boost conversion circuit. The switching devices and control circuitry are used for both motor control and voltage conversion, eliminating the need for separate dedicated voltage conversion components and reducing system complexity
Solution Approach 2:
The patent merges the voltage conversion function with the existing motor control system. The motor winding, switching devices, and control circuitry are combined to perform both motor operation and voltage conversion tasks, consolidating multiple functions into a single integrated system rather than adding separate components
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 charging system efficiently charges high-voltage power batteries by boosting the voltage to a level compatible with the battery requirements, improving charging convenience and reducing system space and costs.
Implementation Method 1
utilizing the motor windings and MCU in the electric vehicle to create a voltage conversion circuit that performs boost conversion on the 500 V power supply voltage to achieve an output voltage of 960 V or higher
Data Source
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AI summary
This application provides a charging system and an electric vehicle. The charging system mainly includes an MCU and a motor. N bridge arms in the MCU and N motor windings in the motor are multiplexed to constitute a voltage conversion circuit. When a power supply voltage is less than a minimum charging voltage of a power battery, the MCU may perform boost conversion on the power supply voltage by using the voltage conversion circuit, and output the power supply voltage obtained after boost conversion to the power battery as a first output voltage, where the first output voltage is not less than the minimum charging voltage. In this application, space occupied by the charging system and costs of the charging system can be reduced while the charging system is used to perform boost conversion on the power supply voltage.