Mobile EV Charging Using the Vehicle Inverter for Fast Portable Power
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Solution Overview
Problem
Existing mobile vehicle charging systems face challenges with large volume, high weight, poor portability, high cost, and slow charging speeds due to the inclusion of power conversion devices and on-board chargers.
Innovation Solution
A mobile vehicle charging system that eliminates the power conversion device by using an electric vehicle's motor and inverter as a power conversion unit, enabling fast charging without the need for a separate power conversion device, and includes a controller, battery management units, and a bidirectional charging cable for efficient energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a power conversion device is included in the mobile charger, then charging functionality is provided, but volume and weight increase making the system less portable
Solution Approach 1:
The patent extracts the power conversion device from the mobile charger and relocates it to the vehicle's existing power conversion unit (motor controller). This removal eliminates the need for separate power conversion hardware in the mobile charger, significantly reducing its volume and weight while maintaining charging functionality through the vehicle's integrated power conversion capabilities.
2Ease of manufacture
If a power conversion device is included in the mobile charger, then charging functionality is provided, but manufacturing cost increases
Solution Approach 1:
The patent makes the vehicle's power conversion unit serve dual functions: motor control during vehicle operation and power conversion during charging operations. This multi-functionality eliminates the need for separate power conversion devices in both the mobile charger and vehicle charging system, reducing overall device complexity and manufacturing costs while maintaining full charging functionality.
3Productivity
If an on-board charger is used for charging, then charging infrastructure is simplified, but charging speed decreases
Solution Approach 1:
The patent utilizes the vehicle's existing power conversion unit (originally designed for motor control) to perform power conversion during charging. By copying the functionality of a dedicated power conversion device through the existing motor controller, the system achieves fast charging capabilities without adding new hardware, thereby increasing charging speed while maintaining simplified system configuration.
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 reduces the volume and weight of the mobile charger, improves charging speed, and decreases manufacturing costs while enhancing heat management, allowing for more efficient and convenient electric vehicle charging.
Implementation Method 1
a first battery storing electrical energy for charging a vehicle
Implementation Method 2
a power conversion unit including a motor and an inverter, while converting the voltage supplied from the first battery to the magnitude of voltage that charges the second battery
Implementation Method 3
controlling current and voltage of charging and output by detecting temperature, current, and voltage in each module of a first battery
Data Source
AI summary
An embodiment system includes a mobile charger and a vehicle. The vehicle includes a connection port designed to interface with the mobile charger and a vehicle battery. A vehicle battery management unit is configured to control a current and a voltage of charging and output by detecting a temperature, a current, and a voltage in each module of the vehicle battery. A power conversion unit includes a motor and an inverter and is configured to convert a voltage received at the connection port to a magnitude of voltage that charges the vehicle battery. A charging management unit is coupled to the second battery management unit and the power conversion unit.