Intermediate Circuit Capacitor Charging With Low-Voltage Power Control
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Solution Overview
Problem
Charging an intermediate circuit capacitor in a high-voltage network from a low-voltage network can cause voltage dips due to the limited capacity of the low-voltage battery, potentially leading to faults or malfunctions in other electrical consumers.
Innovation Solution
A device with a DC/DC converter and control means that determines operating parameters of the low-voltage network, such as voltage or battery status, to adjust the power flow to the intermediate circuit capacitor, ensuring a stable supply voltage by limiting energy draw and deactivating non-critical consumers if necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the intermediate circuit capacitor is charged from the low-voltage network, then the intermediate circuit capacitor can be charged without external power sources, but voltage dips occur in the low-voltage network due to limited battery capacity
Solution Approach 1:
The charging power from the low-voltage network is dynamically adjusted based on the determined operating parameter (state of charge, power capability, or temperature). The control means continuously monitors the battery status and adapts the power extraction rate, transitioning from static charging to dynamic power management that responds to real-time battery conditions, thereby preventing voltage dips while maintaining charging functionality
Solution Approach 2:
A feedback control loop is established where the control means determines the operating parameter of the low-voltage battery and uses this information to adjust the charging power. The system continuously monitors battery status and feeds this information back to the power conversion device, which then modulates the power extraction to keep the battery operating within safe and stable parameters, preventing voltage instability
2Productivity
If high power is drawn from the low-voltage battery to charge the intermediate circuit capacitor quickly, then charging speed increases, but voltage dips and potential malfunctions of other electrical consumers occur
Solution Approach 1:
The charging power parameter is changed and optimized based on the determined operating parameter of the low-voltage battery. Instead of using fixed high power charging, the system adjusts the power parameter dynamically according to battery state of charge, temperature, or power capability, finding the optimal balance between charging speed and voltage stability that prevents harmful voltage dips while maintaining acceptable charging performance
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
Maintains a stable supply voltage in the low-voltage network during charging, preventing voltage dips and ensuring continuous operation of sensitive components, even when the low-voltage battery is depleted or old.
Implementation Method 1
The DC/DC converter (11) is designed to be coupled to a low-voltage network (3) on one input side and to be coupled to the intermediate circuit capacitor (23a) at an output connection and to provide a charging voltage for charging the intermediate circuit capacitor (23a)
Data Source
AI summary
The invention relates to the charging of an intermediate circuit capacitor in a high-voltage network by means of electrical energy from a low-voltage network. According to the invention, it is provided that the power flow from the low-voltage network into the high-voltage network is adjusted using an operating parameter of the low-voltage network, such as electrical voltage in the low-voltage network.