MCU-Motor Boost Charging for 800V EV Battery Compatibility
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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 utilizing a motor control unit (MCU) and motor to perform boost or buck conversion on the power supply voltage, ensuring the power battery receives a voltage within its charging range, implemented by multiplexing MCU and motor windings to adapt the power supply voltage to the battery's requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a 500V charging pile is used to charge an 800V power battery, then the charging infrastructure remains compatible with current standards, but the charging cannot be performed directly due to voltage mismatch
Solution Approach 1:
The patent changes the voltage parameter of the power supply by using the MCU and motor windings as a voltage conversion circuit. The circuit performs boost conversion to transform the 500V power supply voltage into an 800V output voltage suitable for charging the high-voltage power battery, thereby resolving the voltage mismatch issue.
Solution Approach 2:
The patent makes the MCU and motor windings serve multiple functions: they continue to perform their original motor control function while simultaneously functioning as a voltage conversion circuit for charging. This multi-functionality allows the same components to adapt to different voltage requirements without adding separate charging equipment.
2Adaptability or versatility
If a dedicated voltage conversion device is added to enable 800V charging, then the charging compatibility is improved, but the system complexity and cost increase
Solution Approach 1:
The patent applies multi-functionality by enabling the existing MCU and motor windings to serve dual purposes: motor control and voltage conversion for charging. This eliminates the need for separate dedicated voltage conversion devices, thereby reducing system complexity and cost while achieving voltage adaptation capability.
Solution Approach 2:
The patent merges the voltage conversion function with the existing motor control system by using the same MCU and motor windings for both motor operation and voltage conversion during charging. This consolidation avoids adding separate components and simplifies the overall system architecture.
3Device complexity
If the power supply voltage is directly applied to the power battery without conversion, then the system remains simple, but the charging cannot proceed when voltages do not match
Solution Approach 1:
The patent enables the MCU and motor windings to function as a voltage conversion circuit, allowing the simple existing system to adapt to different voltage requirements. The same components that control the motor now also convert voltage during charging, maintaining system simplicity while achieving voltage compatibility.
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 efficient charging of high-voltage power batteries by converting the power supply voltage to a suitable level, improving charging convenience and reducing system space and costs.
Implementation Method 1
the N bridge arms and the N motor windings may constitute a voltage conversion circuit. When the power supply voltage is less than a minimum charging voltage of the power battery, the MCU may perform boost conversion on the power supply voltage by using the voltage conversion circuit
Data Source
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.