EV DC-DC Boost Inverter for Aging Battery Voltage Stability
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Solution Overview
Problem
Electric vehicle batteries and fuel cells face a decrease in voltage and energy supply as they age, making it challenging to reliably power units within and outside the vehicle, especially for commercial vehicles that require higher voltage for operations like additional drives.
Innovation Solution
An apparatus comprising a DC-DC converter and an inverter, connected via an energy supply interface, which increases the input voltage from a vehicle battery or fuel cell to supply a stable and higher output voltage for internal or external units, including additional drives, through a control device that outputs amplifier signals to maintain a minimum voltage threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vehicle battery or fuel cell is used directly to power units, then the system structure remains simple, but the voltage and energy supply decreases as the battery ages, making it unreliable for high-voltage requirements
Solution Approach 1:
The patent introduces a DC-DC converter as an intermediary device between the vehicle battery/fuel cell and the inverter. This mediator transforms the declining voltage from aging power sources into a stable, amplified voltage output, ensuring reliable power supply to high-voltage units without requiring complete system redesign.
Solution Approach 2:
The DC-DC converter dynamically changes the voltage parameter by amplifying the input voltage from the battery or fuel cell to a higher output voltage. This parameter transformation allows the system to maintain reliable high-voltage supply even as the source voltage degrades over time due to aging.
2Stability of the object's composition
If the input voltage is increased using a DC-DC converter, then the output voltage stability is improved, but the device complexity increases due to additional components
Solution Approach 1:
The DC-DC converter is designed to perform multiple functions: voltage amplification, voltage stabilization, and adaptive control based on load requirements. By consolidating these functions into a single device, the system achieves stable output voltage without proportionally increasing overall system complexity.
Solution Approach 2:
The control device monitors the output voltage and adjusts the DC-DC converter's operation accordingly. This feedback mechanism maintains stable output voltage by automatically compensating for variations, reducing the need for additional stabilization components and simplifying the overall control structure.
3Power
If the DC-DC converter amplifies the voltage continuously, then the power supply capability is improved, but the energy consumption increases
Solution Approach 1:
The DC-DC converter operates dynamically, adjusting its amplification ratio based on real-time power requirements. When high power is needed, it amplifies voltage; when lower power suffices, it reduces amplification. This dynamic operation maintains adequate power supply capability while minimizing unnecessary energy consumption during low-demand periods.
Solution Approach 2:
The system applies voltage amplification only to the extent necessary to meet the minimum power requirements of connected units. Rather than continuously maximizing output power, the converter provides partial amplification sufficient for operational needs, avoiding excessive energy consumption while maintaining adequate power supply capability.
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
Ensures reliable power supply to vehicle units by increasing the input voltage to a stable output, maintaining operational efficiency and supporting additional drives, even when the battery or fuel cell voltage drops below a minimum threshold, thus enhancing the operational capabilities of electric vehicles.
Implementation Method 1
The DC-DC converter (111) has a first connection (116) for connecting the DC-DC converter (111) to the energy supply interface (110) and a second connection (118) for connecting the DC-DC converter (111) to the inverter (112), wherein the DC-DC converter (111) is designed to supply an output voltage (122) at the second connection (118), the output voltage (122) being increased with respect to an input voltage (105)
Implementation Method 2
The inverter (112) has an inverter connection (124) for connecting the inverter (112) to the second connection (118) and has at least one energization interface (126) for energizing at least one unit coupled to the energization interface (126), wherein the inverter (112) is designed to convert a DC voltage applied to the inverter connection (124) to an AC voltage and to supply same to the energization interface (126)
Data Source
AI summary
An apparatus for increasing an input voltage for an electric vehicle has an energy supply interface to a vehicle battery, a DC-DC converter and an inverter. The DC-DC converter has a first connection for connection to the energy supply interface and a second connection for connection to the inverter. The DC-DC converter is designed to supply an output voltage at the second connection in response to an amplifier signal, the output voltage being increased with respect to an input voltage applied to the first connection. The inverter has an inverter connection for connecting the inverter to the second connection and has at least one energization interface for energizing at least one unit coupled to the energization interface, the inverter converts a DC voltage applied to the inverter connection to an AC voltage and to supply same to the energization interface.