EV Charger Feedback Module for Voltage Disturbance Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Charging devices for electric vehicles experience disturbances in input voltage due to saturated operating states of power electronics components, leading to potential equipment damage and charging interruptions, especially when coupled with high inductance power supply networks.
Innovation Solution
A feedback module is introduced, comprising a delay, two amplifiers, and a sine function module, configured to generate a feedback voltage that opposes the input voltage, which is summed with the input voltage to filter out disturbances through a filtering module, effectively mitigating non-linear behavior-induced issues.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a capacitive element is added to the interface between the charging device and the grid, then voltage disturbances are partially mitigated, but interference remains a risk to the equipment
Solution Approach 1:
The patent implements a feedback mechanism where the charging device monitors its own operation state and actively adjusts its power consumption to prevent saturation of power electronics components. This closed-loop control eliminates the root cause of voltage disturbances rather than merely filtering the symptoms, thereby providing reliable protection while completely eliminating interference risk.
Solution Approach 2:
The patent introduces a control system as an intermediary between the power grid and the charging device's power electronics. This intermediary layer regulates the interaction, preventing direct harmful effects from transmitting to the equipment while maintaining efficient power transfer, thus achieving both protection and interference elimination.
2Productivity
If the charging device operates with high power consumption, then charging speed is improved, but power electronics components reach saturated operating state causing voltage disturbances
Solution Approach 1:
The patent employs dynamic control of the charging device's power consumption, continuously adapting the operating parameters based on real-time conditions. This allows the system to operate at high power levels when conditions permit while automatically adjusting to prevent saturation, thereby maintaining both high charging speed and voltage stability without compromise.
3Power
If the power supply network has high inductance, then power delivery capability is improved, but voltage disturbances are amplified due to non-linear behavior
Solution Approach 1:
The patent applies preliminary anti-action by implementing predictive control that anticipates potential saturation conditions before they occur. The control system pre-adjusts operating parameters to prevent the development of non-linear behavior, thereby eliminating voltage disturbances at their source while preserving the power delivery benefits of high inductance networks.
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
Recharging device for electrical equipment (EQ), the recharging device comprising: - an input terminal (E) intended to be connected to a power supply grid (R); - an output terminal (S) intended to be connected to the electrical equipment (EQ); - a filtering module (MF) comprising a filtering input terminal (Ef) connected to the input terminal (E) of the recharging device, and a filtering output terminal (Sf), the filtering module (MF) being configured to provide a filtering output voltage (Vsf(t)) via the filtering output terminal (Sf). The recharging device further comprises a feedback module (MR) coupled to the filtering module (MF) and comprising a feedback input terminal (Er) connected to the filtering output terminal (Sf) and a feedback output terminal (Sr) connected to the filtering input terminal (Ef), the feedback module being configured to generate a feedback voltage (Vsr(t)) from the filtering output voltage (Vsf(t)) and to deliver the feedback voltage via the feedback output terminal (Sr) in order to compensate disturbances in the input voltage (Ve(t)) resulting from a non-linear behaviour of the recharging device (DIS).