Vehicle Charging Apparatus Current Stabilization via Bandwidth Adjustment
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Solution Overview
Problem
Vehicle charging apparatuses face instability due to unstable AC current and voltage from the power source, leading to potential overcurrent or overvoltage issues, which can damage the on-board battery charger (OBC) and reduce charging efficiency, and existing solutions to address this increase manufacturing costs and efficiency.
Innovation Solution
A current stabilization method that adjusts the current control bandwidth of the power factor corrector in the vehicle charging apparatus, determining when overcurrent occurs and applying downward adjustments to the bandwidth based on predetermined occurrence thresholds, thereby stabilizing current control without altering the circuit configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the input filter is changed to address unstable AC current and voltage, then the reliability of the charging apparatus is improved, but the manufacturing cost increases and efficiency is reduced
Solution Approach 1:
The patent changes the control parameter (current control bandwidth) of the power factor corrector dynamically based on operating conditions rather than changing the physical input filter hardware. This software-based parameter adjustment resolves the contradiction by improving reliability through adaptive control while avoiding the manufacturing costs and efficiency losses associated with hardware modifications.
Solution Approach 2:
The patent replaces the mechanical/hardware solution (changing input filter components) with a control system solution (adjusting current control bandwidth through control signals). This substitution eliminates the need for physical modifications that increase manufacturing costs, while achieving the same reliability improvement through intelligent control.
2Reliability
If the input filter is changed to address unstable AC current and voltage, then the reliability of the charging apparatus is improved, but the charging efficiency is reduced
Solution Approach 1:
The patent dynamically adjusts the current control bandwidth parameter based on real-time operating conditions, allowing the system to maintain high charging efficiency while improving reliability. This avoids the efficiency reduction that would result from fixed hardware filter modifications.
Solution Approach 2:
The patent implements a dynamic control approach where the current control bandwidth is adjusted in real-time based on operating conditions, rather than using a static hardware filter. This dynamic adaptation maintains optimal charging efficiency while providing the reliability benefits of improved input filtering.
3Reliability
If the current control bandwidth is downwardly-adjusted to stabilize current control, then the reliability is improved and manufacturing cost is avoided, but the control response speed may be reduced
Solution Approach 1:
The patent implements dynamic adjustment of the current control bandwidth, allowing the system to optimize between stability and response speed based on real-time operating conditions. The bandwidth is downwardly-adjusted only when necessary for stability, while maintaining higher values when fast response is needed, thus resolving the contradiction through adaptive control.
Solution Approach 2:
The patent changes the control parameter (current control bandwidth) dynamically based on operating conditions, allowing the system to achieve current control stability when needed while maintaining fast response capability when conditions permit. This parameter adaptation resolves the contradiction between stability and response speed.
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 method ensures stable current control performance, preventing damage to the OBC and improving charging efficiency while maintaining manufacturing cost-effectiveness and efficiency, ensuring the vehicle battery can be conveniently charged with enhanced power source quality.
Implementation Method 1
the vehicle charging apparatus converting an AC voltage of the AC power source into a direct current (DC) voltage to charge a vehicle battery
Implementation Method 2
a power factor corrector for correcting a power factor of an alternating current (AC) power source
Implementation Method 3
downwardly-adjusting a current control bandwidth of the power factor corrector when the current control bandwidth of the power factor corrector needs to be adjusted
Data Source
AI summary
A current stabilization method performed by a vehicle charging apparatus, which includes a power factor corrector for correcting a power factor of an alternating current (AC) power source, vehicle charging apparatus converting an AC voltage of the AC power source into a direct current (DC) voltage to charge a vehicle battery, may include downwardly-adjusting a current control bandwidth of the power factor corrector when the adjusting of the current control bandwidth of the power factor corrector is requested.