DC Filter Device Coil Configuration for Oscillation Damping
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Solution Overview
Problem
Existing DC filter devices in vehicle on-board power systems face challenges in reducing oscillations and electromagnetic interference, particularly when compensating for leakage currents, which can lead to tripping of fault current circuit breakers and compromise electromagnetic compatibility.
Innovation Solution
A DC filter device configuration featuring a coil core with multiple coils and a circuit device including a resistor and an additional coil connected in series, which influences the transfer function to reduce or eliminate oscillations, and is enhanced by capacitors for electromagnetic interference reduction and a compensation device for generating a compensation current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DC filter device is used in vehicle on-board power systems, then electromagnetic compatibility is improved, but oscillations and electromagnetic interference still occur that can lead to tripping of fault current circuit breakers
Solution Approach 1:
A compensation device is introduced as an intermediary element between the DC filter device and the power system. This compensation device generates a compensation current that counteracts the oscillations and leakage currents, thereby reducing electromagnetic interference without compromising the filter device's functionality. The compensation current acts as a mediator to cancel out the harmful oscillations that would otherwise cause circuit breaker tripping.
Solution Approach 2:
The patent modifies the electrical parameters of the filter device by adding a third coil with a circuit device containing a resistor. This changes the transfer function of the DC filter device, allowing it to reduce oscillations. The resistor value and coil configuration are specifically designed to dampen oscillations and alter the frequency response, thereby reducing electromagnetic interference while maintaining filtering effectiveness.
2Object-generated harmful factors
If a third coil with a circuit device containing a resistor is added to the DC filter device, then oscillations are reduced, but device complexity increases
Solution Approach 1:
The third coil with the circuit device containing the resistor is merged with the existing DC filter device structure. Rather than adding a completely separate oscillation reduction system, the solution integrates the damping components directly into the filter device's coil assembly. This merging approach reduces oscillations while minimizing the increase in device complexity by sharing the magnetic core and structural framework.
Solution Approach 2:
The third coil serves multiple functions: it participates in the filtering action along with the first and second coils, and simultaneously provides oscillation damping through the circuit device with the resistor. This multi-functionality allows the added component to address oscillation issues without proportionally increasing complexity, as it contributes to both filtering and stabilization purposes.
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
The proposed configuration effectively reduces oscillations and improves electromagnetic compatibility, ensuring reliable and low-interference behavior in on-board power systems, particularly at charging columns, by damping currents and regulating compensation currents precisely.
Implementation Method 1
at least one first coil arranged on the coil core, the at least one first coil being connected in between the first filter device connection and the third filter device connection; at least one second coil arranged on the coil core
Implementation Method 2
a third coil arranged on the coil core, the third coil having a first coil connection and a second coil connection, wherein the first coil connection and the second coil connection are connected to one another via a circuit device, which circuit device has a resistor
Data Source
AI summary
A DC filter device includes: a first filter device connection; a second filter device connection; a third filter device connection; a fourth filter device connection; a coil core; at least one first coil arranged on the coil core, the at least one first coil being connected in between the first filter device connection and the third filter device connection; at least one second coil arranged on the coil core, the at least one second coil being connected in between the second filter device connection and the fourth filter device connection; and a third coil arranged on the coil core, the third coil having a first coil connection and a second coil connection. The first coil connection and the second coil connection are connected to one another via a circuit device, which circuit device has a resistor.