Integrated Isolated DC-DC Converter for Multiphase Inverters
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Solution Overview
Problem
There is a need for improved multiphase machine systems and components that can provide enhanced functionality and efficient power conversion in applications such as motor vehicles, particularly in converting high voltage DC power to lower voltage DC power for auxiliary systems.
Innovation Solution
An isolated DC-DC power supply system is integrated with a multiphase machine system, comprising an inverter with N machine switch circuits and one or more auxiliary switch circuits, an isolation stage, and a rectifier to convert auxiliary AC output to an isolated DC supply, utilizing transistors and transformers for efficient voltage conversion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an isolated DC-DC converter is integrated with a multiphase machine system, then power conversion efficiency is improved and system functionality is enhanced, but device complexity increases due to the addition of auxiliary switch circuits and isolation stages
Solution Approach 1:
The patent combines the DC-DC converter functionality with the existing multiphase machine inverter by integrating auxiliary switch circuits into the same device housing and control system. The auxiliary switch circuits share the same DC power supply connection and control architecture as the machine switch circuits, merging multiple functions into a single integrated unit rather than separate components.
Solution Approach 2:
The inverter device is designed to perform multiple functions: it provides both machine drive signals through N-phase machine switch circuits and auxiliary AC output through auxiliary switch circuits. The isolation stage and rectifier further enable the system to generate isolated DC supply output, making the single device capable of power conversion, isolation, and multiple output types simultaneously.
2Adaptability or versatility
If auxiliary switch circuits and isolation stages are added to the inverter, then isolated DC supply output is achieved for auxiliary systems, but manufacturing cost and device complexity increase
Solution Approach 1:
The isolation stage and rectifier are integrated into the same device housing as the auxiliary switch circuits, combining isolation and rectification functions with the auxiliary power generation in a single unified component rather than separate modules.
3Measurement precision
If the controller independently generates machine drive commands and auxiliary control commands, then control precision is improved, but processing complexity and loss of time increase
Solution Approach 1:
The controller is designed with self-service capability to handle multiple control tasks independently and simultaneously. The controller autonomously generates both machine drive commands and auxiliary control commands without requiring external intervention or sequential processing, managing its own control signal generation for both functions concurrently.
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 converts high voltage DC power to lower voltage DC power for auxiliary systems, providing isolated and stable power supply for components like instrument systems and batteries in electric vehicles, enhancing system functionality and reducing the need for additional DC sources.
Implementation Method 1
The isolation stage may comprise a transformer. In embodiments, the transformer comprises a step-down transformer.
Implementation Method 2
a rectifier coupled to the isolation stage to rectify the isolated AC output and provide the DC supply output
Data Source
AI summary
A power supply for use with an N-phase multiphase machine comprises an inverter, an isolation stage and a rectifier The inverter is configured to be coupled to a DC power supply and includes N machine switch circuits for providing N-phase machine drive signals to the multiphase machine in response to N-phase machine drive commands, and an auxiliary switch circuit for providing an auxiliary AC output in response to auxiliary control commands. The isolation stage coupled to the auxiliary switch circuit and generates an isolated AC output. The rectifier is coupled to the isolation stage to rectify the isolated AC output and provide an auxiliary DC supply output.