Electric Vehicle Control Device AC Power Conversion
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Solution Overview
Problem
Existing electric vehicle control devices with diesel engines require reduction in size and cost while maintaining efficient AC power control.
Innovation Solution
The electric vehicle control device incorporates an AC synchronous generator, a bidirectional converter, an inverter, and an auxiliary power unit, with a CVCF load, and includes features like AC reactors and an accumulator for power redundancy, allowing for optimized converter selection and reduced auxiliary power source capacity, thereby minimizing size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a diesel engine with AC generator is used to generate AC power, then power supply capability is improved, but device size and cost increase
Solution Approach 1:
The patent extracts the auxiliary power source device from the traditional diesel engine system and replaces it with a compact configuration using an AC synchronous generator directly coupled with bidirectional converter and capacitor. This extraction eliminates the need for heavy diesel engine components while maintaining power supply capability through the generator-capacitor combination.
Solution Approach 2:
The patent replaces the mechanical diesel engine system with an electrical system comprising AC synchronous generator, bidirectional converter, and capacitor. This substitution eliminates mechanical combustion components and reduces device size while maintaining power generation capability through electromagnetic conversion.
2Power
If a diesel engine with AC generator is used to generate AC power, then power supply capability is improved, but device cost increases
Solution Approach 1:
The patent extracts the expensive diesel engine component and replaces it with more cost-effective electrical components including AC synchronous generator, bidirectional converter, and capacitor. This extraction reduces manufacturing cost while maintaining power supply capability through the alternative electrical architecture.
Solution Approach 2:
The AC synchronous generator in the patent serves multiple functions: generating AC power for the inverter, providing power to auxiliary equipment, and enabling bidirectional energy flow through the converter. This multi-functionality reduces the need for separate dedicated components, thereby lowering overall device cost.
3Adaptability or versatility
If auxiliary power source device is added to convert DC to AC for auxiliary equipment, then power supply versatility is improved, but device complexity increases
Solution Approach 1:
The patent merges the auxiliary power source function with the main inverter system by using the same AC synchronous generator and bidirectional converter for both primary propulsion and auxiliary power needs. This consolidation eliminates the need for separate auxiliary power conversion equipment, reducing device complexity while maintaining power supply versatility.
Solution Approach 2:
The inverter system in the patent is designed to serve dual purposes: driving the main propulsion motor and supplying power to auxiliary equipment. The AC synchronous generator and bidirectional converter operate in a multi-functional manner, providing both DC to AC conversion for propulsion and AC power for auxiliary loads, thereby reducing 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
This configuration achieves a reduction in size and cost while maintaining efficient AC power control and performance, with improved current ripple reduction and power supply redundancy.
Implementation Method 1
an AC synchronous generator (2C), which performs CVCF operation
Implementation Method 2
a bidirectional converter (3D) connected with the AC synchronous generator (2C)
Implementation Method 3
an inverter (8), which converts DC power supplied from a DC link into AC power
Implementation Method 4
AC reactors and an accumulator for power redundancy, allowing for optimized converter selection and reduced auxiliary power source capacity, thereby minimizing size and cost
Data Source
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AI summary
An electric vehicle control device wherein: AC power generated by an AC synchronous generator is converted to DC power by a converter; the DC power converted by the converter is converted to AC power by an inverter, and is supplied to a vehicle drive motor constituting a motive power source for driving an electric vehicle; the DC power converted by the converter is converted to AC power by an auxiliary power source device and supplied to a CVCF load, an auxiliary device capable of withstanding harmonics being connected in series with the AC synchronous generator.