Bidirectional EV Inverter Charging Via Motor Neutral Point
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Solution Overview
Problem
Existing systems require separate power converters for converting AC to DC and DC to AC when exchanging electric power between a vehicle with a storage battery and a house or facility, necessitating a complex configuration.
Innovation Solution
An electrical power system with a storage battery, electric motor, and a power converter connected to both, using a first power line from the motor's neutral point for power exchange, and a power connection part to facilitate simple power exchange between the vehicle and a house or facility, allowing charging and discharging via alternating current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate power converters are provided for AC to DC conversion and DC to AC conversion, then reliable power exchange between vehicle and house is achieved, but device complexity increases
Solution Approach 1:
The patent combines the AC to DC converter and DC to AC converter into a single bidirectional power converter that can operate in both conversion modes. This single converter unit integrates the functionality of two separate converters, reducing device complexity while maintaining the reliability of power exchange between the vehicle's storage battery and the house power supply system.
Solution Approach 2:
The bidirectional power converter is designed with multi-functionality, capable of performing both AC to DC conversion (when charging the storage battery from the house) and DC to AC conversion (when discharging the storage battery to the house). This universal converter eliminates the need for separate dedicated converters for each conversion direction, simplifying the overall system configuration.
2Adaptability or versatility
If separate power converters are provided for AC to DC conversion and DC to AC conversion, then complete power conversion capability is achieved, but cost increases
Solution Approach 1:
By merging the AC to DC converter and DC to AC converter into a single bidirectional power converter, the patent reduces the total number of components that need to be manufactured and assembled. This integration lowers manufacturing costs while preserving complete power conversion capability for both charging and discharging operations.
Solution Approach 2:
The universal bidirectional converter design eliminates the need to manufacture and stock two separate types of converters, reducing production complexity and cost. The single converter unit performs both conversion functions, providing complete adaptability for power exchange in both directions without the expense of dual converter systems.
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 and simplified power exchange between a vehicle and a house or facility using a single power converter, reducing complexity and cost by eliminating the need for separate converters.
Implementation Method 1
it is necessary to convert an alternating current into a direct current when charging the storage battery by the electric power of the house or the like, and it is necessary to convert the direct current into the alternating current when discharging the electric power of the storage battery to the electric load in the house or the like
Data Source
AI summary
An electrical power system includes a high voltage battery and an electric motor provided in a vehicle, an inverter device to convert an output of the high voltage battery into an alternating current to drive the electric motor, a power line extending from a neutral point of an armature of the electric motor, a charge and discharge port provided on the vehicle and connected to a tip end of the power line, a power supply system provided in a house, and a charging and discharging cable having a tip end electrically connectable to the charge and discharge port, wherein the high voltage battery is chargeable with the electric power supplied from the power supply system via the inverter device, the neutral point, the power line, and the charging and discharging cable, and the electric power is dischargeable from the high voltage battery to the power supply system.