Vehicle Charger PLL Gain Adaptation for Grid Phase Tracking
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Solution Overview
Problem
Existing vehicle charging devices face issues with phase tracking errors and circuit damage due to changes in grid voltage, frequency, and temperature, leading to inefficiencies and potential malfunctions.
Innovation Solution
A vehicle charging device equipped with an amplitude and frequency detection system that adjusts PLL coefficients based on real-time grid voltage conditions, incorporating a phase detection unit, LPF, and VCO to enhance phase tracking and prevent circuit damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the charger operates without checking for aging and environmental factors, then the device complexity is reduced, but the reliability deteriorates due to high voltage arcs and operational defects
Solution Approach 1:
The patent applies preliminary action by performing inspections of internal components, connection fastenings, and terminal connections before the charger operates. This includes checking for aging, temperature-related shrinkage/expansion, and micro-vibration damage, thereby preventing high voltage arcs and operational defects before they occur.
Solution Approach 2:
The patent implements feedback mechanisms through inspection devices that monitor the charger's internal components and connection states. The inspection results provide feedback to determine whether the charger is suitable for operation, enabling dynamic adjustment of operational status based on real-time component conditions.
2Device complexity
If the PLL unit uses fixed gain values, then the device complexity is reduced, but the phase tracking performance deteriorates when grid voltage conditions change
Solution Approach 1:
The patent applies dynamics by making the PLL unit's gain values adjustable based on grid voltage conditions. The inspection device detects grid voltage parameters and dynamically adjusts the PLL gain values to match current operating conditions, improving phase tracking precision without excessive complexity through structured adjustment mechanisms.
Solution Approach 2:
The patent implements parameter changes by modifying the PLL unit's gain values according to detected grid voltage conditions. The inspection device measures grid voltage parameters and adjusts corresponding PLL parameters to optimize phase tracking performance under varying electrical conditions.
Data Source
AI summary
A vehicle charging device according to the present embodiment comprises: an amplitude detection unit that detects a magnitude of a grid voltage being inputted to the vehicle charging device; a frequency detection unit that detects a frequency of the grid voltage; a PLL (Phase Locked Loop) unit that monitors a phase of the grid voltage; and a gain selection unit that inputs a coefficient calculated using the magnitude and frequency of the grid voltage to the PLL unit, wherein the amplitude detection unit and the frequency detection unit detect a plurality of points at which the state of the grid voltage changes.