Voltage Converter Startup Control to Limit Inrush Voltage Drop
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Solution Overview
Problem
Voltage converters in electrical systems experience significant voltage drops and oscillations due to inrush currents during startup, causing electromagnetic noise and compatibility issues, which existing filtering solutions like Pi filters do not fully address.
Innovation Solution
An external control circuit is used to selectively activate and deactivate the voltage converter during startup, using a hysteresis comparator to manage the inrush current and minimize voltage drops and oscillations, allowing for a smaller smoothing filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the voltage converter is activated during startup, then power supply to the secondary network is enabled, but large inrush current causes voltage drop and oscillations on the primary network
Solution Approach 1:
The external control circuit is configured to selectively activate the voltage converter before full power operation is required, enabling progressive startup that limits inrush current while still providing necessary power to the secondary network
Solution Approach 2:
The voltage converter's operation is dynamically controlled by the external control circuit, which adjusts activation based on real-time voltage conditions on the primary network, allowing the system to adapt between full power operation and limited operation modes
2Object-affected harmful factors
If a Pi filter is used to reduce transients, then electromagnetic noise is reduced over a wider frequency spectrum, but the filter size and complexity increase
Solution Approach 1:
The external control circuit combines multiple control functions (voltage monitoring, converter activation, and filter control) into a single integrated circuit, reducing overall system complexity while maintaining effective noise reduction
Solution Approach 2:
The external control circuit acts as an intermediary between the primary and secondary networks, managing power flow and filtering requirements without requiring a large, complex Pi filter structure
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 approach significantly reduces voltage drops and oscillations during startup, improving electromagnetic compatibility and enabling a more efficient and cost-effective electrical system design.
Implementation Method 1
the external control circuit for controlling the converter takes the form of wired logic and comprises a hysteresis comparator
Implementation Method 2
the first supply line comprising at least one smoothing filter
Data Source
AI summary
The invention relates to an on-board electrical system, comprising at least one main battery (1), a primary network (VR1) directly supplied with power from the main battery, a voltage converter (3) supplying power to a secondary network (VR2), the voltage converter being supplied with power from the main battery via a first supply line (2), the first supply line comprising at least one smoothing filter (22), the system being characterized in that it comprises an external control circuit (4) for controlling the converter, which circuit is configured to selectively activate or deactivate the operation of the voltage converter so as to minimize the voltage drop on the primary network when the voltage converter is started up.