Multi-Phase DC Charging for Auxiliary Power Across 400V/800V
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Solution Overview
Problem
Existing charging systems for vehicles with secondary batteries face inefficiencies when switching between 400 V and 800 V charging equipment, and the use of voltage converters for voltage conversion leads to reduced charging efficiency and auxiliary device operation.
Innovation Solution
A charging system with a DC voltage conversion unit and control unit that includes coils of multiple phases, allowing for selective phase driving based on auxiliary device requirements, enabling efficient voltage conversion to drive auxiliary devices without converters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a voltage converter is used to convert DC voltage for charging with 400V class charging equipment, then the vehicle can be charged with both 400V and 800V class equipment, but charging efficiency deteriorates
Solution Approach 1:
The patent extracts the voltage conversion function from a separate voltage converter and integrates it into the DC-DC converter that already exists in the vehicle for auxiliary device power supply. This eliminates the need for a dedicated voltage converter during charging, reducing energy loss while maintaining compatibility with both 400V and 800V charging equipment.
Solution Approach 2:
The DC-DC converter is designed to perform multiple functions: it supplies power to auxiliary devices during normal operation and performs voltage conversion during charging operations. This multi-functionality eliminates the need for separate voltage conversion equipment, improving charging efficiency while maintaining versatility.
2Ease of operation
If a DC-DC converter is added to convert electric power for auxiliary devices during charging, then auxiliary devices can operate during charging, but system complexity increases
Solution Approach 1:
The existing DC-DC converter used for auxiliary device power supply is made multi-functional by enabling it to perform voltage conversion during charging operations. This eliminates the need for additional voltage conversion equipment, maintaining auxiliary device operation capability while avoiding increased system complexity.
Solution Approach 2:
The patent merges the voltage conversion function with the auxiliary power supply function in a single DC-DC converter unit. This consolidation avoids adding separate equipment, thereby maintaining ease of operation for auxiliary devices without increasing overall system complexity.
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 system efficiently supplies electric power to auxiliary devices with minimal loss, supporting high-efficiency operation across different charging voltages without the need for voltage converters.
Implementation Method 1
a DC voltage conversion unit configured to convert a DC voltage at a charging equipment side to an auxiliary device side voltage different from a battery voltage
Data Source
AI summary
A charging system has a battery, an auxiliary device driven by electric power supplied from the battery when the battery supplies the electric power, a DC voltage conversion unit which converts a DC voltage at a charging equipment side to an auxiliary device side voltage different from a battery voltage and supplies the auxiliary device side voltage to the auxiliary device, and a control unit which controls the DC voltage conversion unit. The DC voltage conversion unit includes coils of a plurality of phases, and conversion units provided for every phases. The control unit includes a phase number selection unit which determines the auxiliary device side voltage based on operation required information of the auxiliary device, determines the number of phases to be driven based on the auxiliary device side voltage, and drives the determined number of phases to supply electric power to the auxiliary device.