Vehicle Power Supply System with Segmented Voltage Converters
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Solution Overview
Problem
Conventional power supply systems for vehicles face challenges in achieving high efficiency operation for motors of different characteristics, leading to increased power loss due to equal voltage supply across all motors.
Innovation Solution
A power supply system that includes a high-voltage battery, a first and second power converter, and corresponding drive electric motors, allowing for voltage stepping and efficient power distribution based on motor characteristics, with optional accessories and charging units for optimized power management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single voltage converter is used to supply power to multiple drive motors, then the system cost is reduced and structure is simplified, but the power loss increases because all motors receive equal voltage regardless of their different characteristics
Solution Approach 1:
The patent divides the single voltage converter into multiple separate voltage converters, with each converter dedicated to a specific drive motor. This segmentation allows each motor to receive customized voltage according to its characteristics, reducing power loss while maintaining system functionality.
Solution Approach 2:
The patent implements local quality by providing different voltage levels to different motors based on their specific requirements. Each voltage converter is configured to output voltage optimized for its associated motor, rather than using a uniform voltage for all motors.
2Loss of energy
If multiple voltage converters are used to supply optimized voltage to each drive motor, then the power loss is reduced and motor efficiency is improved, but the system cost and complexity increase
Solution Approach 1:
The patent designs the voltage converters with universal functionality to handle multiple operations including voltage conversion, power supply, and regenerative braking. Each converter can operate in different modes (boost, buck, regenerative) making the system more efficient without requiring entirely separate systems for each function.
Solution Approach 2:
The patent merges the voltage conversion and regenerative braking functions into the same power converter system. The converters handle both power delivery to motors and power recovery during regenerative braking, reducing the need for separate components and mitigating the complexity increase.
3Ease of manufacture
If all motors operate at equal voltage from a single converter, then the system is simpler and lower cost, but motors of different characteristics cannot operate at high efficiency
Solution Approach 1:
The patent implements dynamic voltage control where each voltage converter can independently adjust its output voltage based on the real-time operating conditions and characteristics of its associated motor. This dynamic adaptation allows motors to operate at peak efficiency across varying load conditions.
Solution Approach 2:
The patent changes the voltage parameter for each motor based on its specific characteristics and operating requirements. Each voltage converter adjusts its output voltage parameter to optimize motor efficiency, rather than maintaining a fixed uniform voltage for all motors.
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 low-cost, low-loss electric power supply tailored to each motor's characteristics, improving marketability through enhanced traction, acceleration, and regenerative capabilities, while reducing overall system losses and handling infrastructure costs effectively.
Implementation Method 1
a voltage converter (for example, the high-voltage DCDC converter 22 described later) which is connected to the storage battery and steps down voltage of the storage battery
Data Source
AI summary
To provide a system of low cost and low loss capable of the supply of electric power according to characteristics of each of a plurality of motors from a single battery. A power supply system for a vehicle of the present invention includes: a high-voltage battery; a first inverter which connects with the high-voltage battery; a motor described later which connects with the first inverter; a high-voltage DCDC converter which is connected to the high-voltage battery and steps down the voltage of the high-voltage battery; a second inverter which connects with the high-voltage battery; and a motor described later which connects with the second inverter.