Power Conversion Device for Simultaneous Wired and Wireless Charging
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Solution Overview
Problem
Existing power conversion devices for electric vehicles cannot simultaneously charge batteries from both wired and wireless paths due to voltage constraints, leading to inefficiencies and increased power loss, especially when the AC supply voltage is high.
Innovation Solution
A power conversion device with integrated bus connectivity and capacitors that allows simultaneous power supply through both wired and wireless methods by adjusting DC voltages across converter circuits to minimize losses, using a control circuit to manage power distribution and optimize voltage levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the PFC unit is used as a boost circuit to handle high AC supply voltage, then the wired path can operate at high voltage, but the wireless path cannot receive sufficient voltage to operate simultaneously
Solution Approach 1:
The patent divides the power conversion system into separate wired path and wireless path segments, each with its own PFC unit. This allows independent voltage regulation in each path, enabling simultaneous operation despite different voltage requirements. The wired path PFC handles high AC supply voltage while the wireless path PFC handles the rectified voltage from the power receiving coil, resolving the voltage incompatibility issue.
Solution Approach 2:
The patent implements a universal power conversion architecture where both wired and wireless paths can independently perform power supply functions. Each path is equipped with complete power conversion components including PFC units, allowing the system to adapt to different charging scenarios (wired only, wireless only, or simultaneous charging) without functional limitations.
2Loss of energy
If the system operates with high AC supply voltage through the wired path, then power conversion efficiency is improved, but the wireless path voltage becomes insufficient for operation
Solution Approach 1:
By segmenting the power conversion system into independent wired and wireless paths with separate PFC units, the patent allows each path to optimize its own voltage levels. The wired path can operate at high voltage for efficiency while the wireless path receives appropriate voltage through its own PFC regulation, eliminating the voltage conflict.
3Reliability
If the system is designed to handle voltage variations in one path, then reliability is improved for that path, but the other path cannot operate simultaneously due to fixed voltage requirements
Solution Approach 1:
The patent divides the power system into independent wired and wireless paths, each with its own voltage regulation capabilities. This segmentation allows the wired path to handle voltage variations reliably while the wireless path maintains its own voltage stability, enabling prolonged simultaneous operation of both paths.
Solution Approach 2:
The patent implements dynamic voltage regulation in each path through dedicated PFC units that can adapt to varying input conditions. The wired path PFC handles AC supply voltage variations while the wireless path PFC handles rectified voltage variations, allowing both paths to operate dynamically and simultaneously under different conditions.
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
Enables efficient simultaneous power supply via both wired and wireless methods regardless of voltage values, improving workability and reducing power loss by dynamically adjusting voltage levels across the power conversion circuits.
Implementation Method 1
a power receiving coil as a first end for receiving power in a non-contact manner by magnetically coupling with a power transmission coil of a power transmission device
Data Source
AI summary
An output terminal of a contact type charger connected to an AC power supply 1 and being for boosting or stepping down an input voltage, and an output terminal of a non-contact type charger for receiving power in a non-contact manner are connected to an input terminal of a DC/DC converter via an integrated bus, a DC link capacitor is connected between an AC/DC converter and an isolated DC/DC converter included in the contact type charger, an integrated capacitor is connected to the integrated bus, and a control circuit adjusts a DC voltage of the DC link capacitor or the integrated capacitor such that at least one of power losses or a total power loss of the contact type charger, the non-contact type charger, and the DC/DC converter is reduced.