Portable EV Charger Power Factor Correction Circuit
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Solution Overview
Problem
Current electric vehicle chargers lack power factor correction capability, leading to harmonics and reactive power issues in the power system and limited high-power charging efficiency.
Innovation Solution
A portable charger design incorporating a filtering rectifier module, IC power supply module, DC-DC PFC module, and DC-DC BUCK module with power factor correction capabilities, which converts AC power to stable DC power for efficient high-power charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If power factor correction capability is added to chargers, then reactive power and harmonics in the power system are reduced, but device complexity increases
Solution Approach 1:
The charger is divided into multiple functional modules: AC input module, PFC (Power Factor Correction) module, isolation DC-DC module, and output control module. Each module independently handles specific tasks, allowing the PFC function to be added without redesigning the entire system. This modular segmentation resolves the contradiction by enabling power factor correction while maintaining manageable device complexity through structured organization.
Solution Approach 2:
The patent introduces a PFC module as an intermediary component between the AC input and the DC-DC conversion stage. This intermediary module specifically addresses reactive power and harmonics issues by correcting the power factor before power conversion, thereby reducing harmful effects on the power system without requiring fundamental changes to the core charging functionality.
2Productivity
If high power charging capability is implemented, then charge efficiency is improved, but reactive power and harmonics increase
Solution Approach 1:
The PFC module performs power factor correction in advance, before the high-power DC-DC conversion process. By pre-correcting the AC input power and reducing harmonics at the input stage, the system can subsequently deliver high power output without proportionally increasing reactive power and harmonics, thus maintaining high charge efficiency while controlling harmful effects.
Solution Approach 2:
The charger employs dynamic control mechanisms where the PFC module and DC-DC module work in coordination with adaptive control algorithms. The system dynamically adjusts operating parameters based on load conditions, enabling high power output when needed while maintaining power factor correction to minimize reactive power and harmonics, thus resolving the contradiction between productivity and harmful factors.
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
The solution minimizes reactive power in the power system and enables high-power charging, improving charge efficiency and safety by stabilizing voltage and current output.
Implementation Method 1
filtering rectifier module (100)
Implementation Method 2
filtering rectifier module (100)
Implementation Method 3
DC-DC PFC module (300)
Implementation Method 4
DC-DC BUCK module (400)
Data Source
AI summary
A type of portable chargers with power factor correction capability for use with electric vehicles comprises of a filtering rectifier module, an integrated circuit power supply module, a DC-DC PFC module and a DC-DC BUCK module. The filtering rectifier module has one input port and two output ports. The IC power supply module has one input port and two output ports. The DC-DC PFC module has two input ports and one output port. The DC-DC BUCK module has two input ports and one output port. The two output ports of the filtering rectifier module are connected to the input port of IC power supply module and the input port of the DC-DC PFC module respectively. The output port of the DC-DC PFC module is connected to one of the input ports of the DC-DC BUCK module. The two output ports of IC power supply module are connected, respectively, to the other input port of the DC-DC PFC module and to the other input port of the DC-DC BUCK module. This new type of portable chargers embodied with this invention can effectively reduce reactive power in the power system and develop greater power.