Parallel DC-DC Converters for Vehicle Power Supply Voltage Stability
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Solution Overview
Problem
Conventional 12 volt on-board power supply systems in motor vehicles struggle to provide sufficient power during rising electrical loads and new safety and comfort functions, leading to potential voltage dips that can compromise safety.
Innovation Solution
The implementation of two DC-to-DC converters connected in parallel, each adjustable to different voltage values, allows for increased power supply and mitigates voltage dips by independently adjusting setpoint voltages via a databus, eliminating the need for additional sensors and wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a conventional 12 volt on-board power supply system is used, then the system structure remains simple, but the system cannot provide sufficient power during rising electrical loads and new safety and comfort functions
Solution Approach 1:
The patent combines two DC-to-DC converters in parallel within the on-board power supply system to increase power supply capacity. This merging approach allows the system to handle rising electrical loads and new safety/comfort functions while maintaining a relatively simple structure by utilizing existing converter components.
2Power
If the power supply system is overloaded, then more power can be supplied, but voltage dips occur that compromise safety
Solution Approach 1:
The patent implements dynamic voltage control by independently adjusting the setpoint voltages of two parallel DC-to-DC converters via databus. This dynamic adjustment allows the system to respond to varying load conditions and prevent voltage dips that could compromise safety, while maintaining reliable power delivery during overload conditions.
3Ease of operation
If additional sensors and wiring are added to control DC-to-DC converters, then synchronized actuation can be achieved, but device complexity increases
Solution Approach 1:
The patent replaces the mechanical/electrical synchronization system (sensors and wiring) with an electronic control system using databus communication. This substitution allows synchronized actuation of the two DC-to-DC converters without the physical complexity of additional sensors and wiring, reducing device complexity while maintaining ease of operation.
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 solution ensures stable power delivery by doubling electrical power capacity and limiting voltage dips within normal fluctuations, maintaining safe operation during peak demands without additional complexity or hardware.
Implementation Method 1
The respective DC-to-DC converter (131, 141) is designed to reduce a high voltage of the high-voltage battery (11) to a voltage to be predetermined
Data Source
AI summary
A motor vehicle has a high-voltage battery and two separate electric machines. Each electric machine is associated with a power electronics unit, and each power electronics unit has a DC-to-DC converter. Each DC-to-DC converter is designed to reduce a high voltage of the high-voltage battery to a predetermined voltage. The two DC-to-DC converters of the two power electronics units are connected electrically in parallel and are set to different voltage values.