Power Converter Voltage Step-Down and Step-Up for Motor Vehicle
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Solution Overview
Problem
Existing motor vehicle systems that use power storage devices for energy supply and regeneration require additional power converters to step down output voltage during low-power output, increasing manufacturing costs.
Innovation Solution
A motor vehicle system with a power converter that has both voltage step-down and step-up functions, connected to a power storage device and inverter, allowing it to supply energy during power driving and recover energy during regeneration, while also utilizing a second power storage device with a low-voltage characteristic for auxiliary operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a power converter with voltage step-down function is added to reduce inverter loss during low-power output, then energy efficiency is improved, but manufacturing cost increases
Solution Approach 1:
The power converter is designed to perform multiple functions: voltage step-down during power driving to reduce inverter loss, and voltage step-up during regeneration to recover energy. This multi-functionality eliminates the need for separate converters for each function, reducing overall system complexity and manufacturing cost while maintaining energy efficiency benefits
2Loss of energy
If a power converter is added to step down output voltage during power driving, then energy efficiency is improved, but device complexity increases
Solution Approach 1:
The power converter serves dual purposes by implementing both voltage step-down capability for power driving and voltage step-up capability for regeneration. This eliminates the need for separate dedicated converters, thereby reducing device complexity while achieving energy efficiency improvements
Solution Approach 2:
The patent merges the functions of voltage step-down converter and voltage step-up converter into a single power converter unit. This consolidation reduces the number of components and simplifies the overall system architecture while maintaining the ability to reduce inverter loss during power driving
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
Reduces inverter loss during power driving and securely recovers energy during regeneration, effectively utilizing the power converter and lowering manufacturing costs.
Implementation Method 1
the power converter steps down an output voltage of the power storage device to supply the energy from the power storage device to the inverter
Implementation Method 2
the power converter steps up a DC voltage of the inverter to recover regenerated energy into the power storage device
Implementation Method 3
An inverter converts a direct current into an alternating current
Data Source
AI summary
A motor vehicle has a motor performing power driving and regeneration. The motor includes an inverter, a first power storage device suppling energy to the motor, a power converter and a circuit. The converter has a voltage step down function during the power driving and a voltage step up function during the regeneration. The power converter, with the voltage step down function during the power driving, is connected in the circuit to the first power storage device. During the power driving of the motor, the power converter steps down an output voltage of the first power storage device to supply the energy from the first power storage device to the inverter. During the regeneration in the motor, the power converter steps up a DC voltage of the inverter to recover regenerated energy into the first power storage device.