Dual-Storage Vehicle Power Converter for Wider Inverter DC Range
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Solution Overview
Problem
Existing motor vehicles with power driving and regeneration capabilities face limitations in the range of DC voltage setting for inverters due to the step-up ratio limitations of power converters, which restrict the efficient sharing of energy between different types of power storage devices.
Innovation Solution
A motor vehicle system that includes a power converter with both step-down and step-up functions, connecting a large-capacity and high-power power storage device in parallel, allowing energy sharing and voltage control based on motor rotation speed and power storage status, and sharing a ground connection switch and reactor between the power converters for these devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a power converter with voltage step down function is introduced to step down output voltage of the first power storage device, then the minimum output voltage can be zero voltage allowing expansion of DC voltage setting range, but the device complexity increases
Solution Approach 1:
The patent applies universality by designing a single power converter that performs multiple functions: it can step down voltage from the first power storage device, step up voltage from the second power storage device, and provide both voltage transformation directions as needed. This multi-functional design consolidates what would otherwise require separate converters, reducing overall system complexity while enabling expanded DC voltage setting range through the combination of step-down and step-up capabilities.
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 enables the expansion of the DC voltage range for inverters, allowing for efficient energy sharing and reduced current stress on power storage devices, thereby improving energy management and reducing device deterioration during power driving and regeneration.
Implementation Method 1
During the power driving of the motor, the power converter steps down an output voltage of the first power storage device to supply energy from the first power storage device and the second power storage device to the inverter
Implementation Method 2
During the motor power regeneration, the power converter may step up a DC voltage of the inverter to recover the energy into the first power storage device and the second power storage device
Data Source
AI summary
A motor vehicle has a motor, an inverter, a first power storage device, with a large-capacity characteristic, a second power storage device, with a high-power characteristic, a power converter and a circuit. The power converter has a voltage step down function during power driving. In the circuit, the power converter is connected to the first power storage device and the second power storage device. Thus, the first power storage device and the second power storage device are parallel to each other. During the power driving of the motor, the power converter steps down an output voltage of the first power storage device to supply energy from the first power storage device and the second power storage device to the inverter.