On-Board Charger Harmonic Filtering With Inverter Mode Switching
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Solution Overview
Problem
Existing eco-friendly vehicle charging systems face challenges in removing low-order harmonics without increasing volume and cost, and simultaneous operation with power conversion devices limits charging efficiency.
Innovation Solution
Utilizing existing vehicle components like a motor inverter or high voltage converter as an active filter to remove low-order harmonics without additional elements, employing series or parallel connections with the on-board charger and selecting modes based on filtering requests and capacitor charging states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If an additional filtering element is added to the power conversion device to remove low-order harmonics, then the harmonic removal capability is improved, but the device volume and cost increase
Solution Approach 1:
The patent makes the power conversion device itself perform dual functions: both power conversion and harmonic filtering. The controller enables the power conversion device to operate in different modes - a first mode for power conversion and a second mode for filtering low-order harmonics - eliminating the need for separate filtering elements and reducing device volume.
2Object-generated harmful factors
If an additional filtering element is added to the power conversion device to remove low-order harmonics, then the harmonic removal capability is improved, but the manufacturing cost increases
Solution Approach 1:
The patent makes the power conversion device itself perform dual functions: both power conversion and harmonic filtering. The controller enables the power conversion device to operate in different modes - a first mode for power conversion and a second mode for filtering low-order harmonics - eliminating the need for separate filtering elements and reducing device volume.
3Object-generated harmful factors
If an additional power conversion device is used for filtering, then the harmonic removal capability is improved, but the charging operation is limited due to simultaneous operation requirements
Solution Approach 1:
The patent implements dynamic mode switching capability in the power conversion device. The controller can dynamically switch between a first operating mode for power conversion and a second operating mode for harmonic filtering based on system conditions. This dynamic adaptability allows the single device to handle both functions without requiring simultaneous operation of separate devices, thereby improving charging operation flexibility.
Data Source
AI summary
An embodiment charging power filtering method includes receiving a signal instructing whether or not a filtering request is required from an on-board charger, selecting a mode of a plurality of modes for driving a filter based on the signal instructing whether or not the filtering request is required, and charging a battery using the selected mode.