Vehicle Power Output Circuit With Switchable Ground Isolation
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Solution Overview
Problem
Vehicle power feeding systems often introduce noise into the supplied power due to body-earthed voltage applications during power feeding, which can degrade the quality of the electrical output.
Innovation Solution
Incorporating a power conversion circuit and controller in the vehicle that maintains the first and second output terminals ungrounded, allowing the controller to apply a requested voltage between these terminals, and using a ground switch to disconnect the ground terminal from the vehicle body when necessary, thereby reducing noise and ensuring accurate voltage application.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the ground terminal is grounded to the vehicle body, then the vehicle body provides a stable reference potential, but noise from the vehicle body is superimposed on the supplied power
Solution Approach 1:
The patent segments the grounding function by introducing a ground switch that can selectively connect or disconnect the ground terminal from the vehicle body. This allows the system to separate the reference potential stability function from the noise coupling path, enabling stable grounding when needed while preventing noise superposition during power feeding operations.
Solution Approach 2:
The grounding state of the ground terminal is made dynamic rather than fixed. The ground switch enables the system to transition between grounded and ungrounded states based on operational requirements, allowing optimal noise reduction during power feeding while maintaining reference stability when charging or other operations require grounding.
2Device complexity
If the first and second output terminals are grounded to the vehicle body, then the electrical connection is simplified, but accurate voltage application between terminals becomes difficult
Solution Approach 1:
The patent extracts the grounding connection from the voltage application path by keeping the first and second output terminals ungrounded. This separation allows accurate voltage control between the output terminals independent of the vehicle body potential, while the ground terminal provides reference stability through selective grounding via the ground switch.
3Object-affected harmful factors
If the ground switch disconnects the ground terminal from the vehicle body, then noise is reduced, but the system loses a stable reference potential
Solution Approach 1:
The ground switch enables periodic or conditional switching between grounded and ungrounded states. During power feeding operations, the ground terminal is disconnected to reduce noise. During charging or other operations requiring stable reference, the ground terminal is connected. This temporal separation of functions resolves the contradiction between noise reduction and reference stability.
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
This configuration effectively reduces noise in the supplied power and ensures that the vehicle can provide electric power suitable for various discharging assemblies, improving the accuracy and efficiency of power feeding.
Implementation Method 1
a power conversion circuit configured to receive DC power supplied from the power storage device and output the AC power to the discharging port side
Data Source
AI summary
A vehicle includes a power storage device, a discharging port, a power conversion circuit, and a controller. The discharging port includes a first output terminal, a second output terminal and a ground terminal. Each of the first output terminal and the second output terminal is not grounded to a body of the vehicle. The controller is configured to obtain a requested voltage value of a discharging connector connected to the discharging port. When the discharging connector is connected to the discharging port, the controller controls the power conversion circuit such that a voltage corresponding to the requested voltage value of the discharging connector is applied between the first output terminal and the second output terminal.