Vehicle Interface Non-Local Ground Noise Compensation
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Solution Overview
Problem
The generation of output signals in vehicle charging systems is compromised by floating ground connections and electrical disturbances, particularly due to non-local grounds, which affect the accuracy and reliability of charging operations.
Innovation Solution
A vehicle interface with a non-local ground configuration, including a shunt between the reference circuit and the vehicle chassis ground, and independent drivers for switches, along with a compensation device featuring a differential amplifier, level shifter, and peak detection unit, is used to mitigate the impact of voltage differentials and common mode noise, ensuring accurate switching and charging control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a ground connection is tied to generate an output signal, then the output signal can be generated, but the ground connection may float or experience electrical disturbances compromising signal accuracy
Solution Approach 1:
The patent introduces a non-local ground as an intermediary reference point that is electrically isolated from the vehicle chassis ground. This mediator ground reference does not float or experience disturbances like the local ground, providing a stable reference for signal generation without being affected by ground connection issues.
Solution Approach 2:
The patent segments the ground reference system into two independent parts: the vehicle chassis ground and the non-local ground. By separating these ground references, the system avoids the problem where a single ground connection must serve multiple functions, eliminating the floating ground issue while maintaining signal generation capability.
2Measurement precision
If a shunt is placed between reference circuit and vehicle chassis ground, then voltage differentials can be compensated, but device complexity increases
Solution Approach 1:
The shunt acts as an intermediary element that provides a controlled electrical connection between the reference circuit and vehicle chassis ground. It allows precise measurement of voltage differentials while maintaining electrical isolation, enabling accurate measurements without requiring complex isolation circuits.
Solution Approach 2:
The shunt enables feedback measurement of voltage differentials between the non-local ground and vehicle chassis ground. This feedback information is used to compensate for ground voltage variations, improving measurement precision through a relatively simple additive component rather than complex system redesign.
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 solution effectively compensates for voltage variations and electrical inconsistencies, ensuring reliable and accurate charging operations by isolating the reference circuit from voltage differentials and providing feedback for monitoring and controlling charging processes.
Implementation Method 1
measuring a voltage difference between a non-local ground and a vehicle chassis ground
Implementation Method 2
A shunt may be included between the reference circuit and the vehicle chassis ground
Data Source
AI summary
A vehicle interface is contemplated to be operable with an Electronic Vehicle Supply Equipment (EVSE) system and a vehicle charging system to facilitate vehicle charging related operations. The vehicle interface may include a noise compensation configured to facilitate compensating for noise within the reference signal resulting from the reference circuit. The vehicle interface may be configured to adapted to common mode interference and other influences resulting from connections between the vehicle interface and EVSE being referenced to earth ground and connections between the vehicle interface and other vehicle electronics being reference to a vehicle chassis ground.