Filter Circuit Resonant Current Suppression for Energy Supply Feedback
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Solution Overview
Problem
Existing filter circuit elements using line chokes struggle to effectively reduce feedback from consumers on energy supplies while minimizing the risk of overvoltages, which can lead to consumer damage due to limited filtering of high-frequency interferences and resonant currents.
Innovation Solution
Incorporating a resonant current suppression group (RCS group) with bandpass characteristics in parallel to the line choke coils, comprising coils and capacitors, to reduce or suppress voltage increases generated by resonant currents, and additional filter circuit groups to dissipate harmonics, thereby minimizing overvoltages and feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a line choke is used to reduce high-frequency interferences, then feedback is reduced, but resonant currents cause voltage increases and overvoltages
Solution Approach 1:
An RC circuit is introduced as an intermediary element connected in parallel to the line choke. This RC circuit acts as a mediator that suppresses the resonant currents generated by the line choke without affecting its primary filtering function, thereby reducing both feedback and overvoltages simultaneously
Solution Approach 2:
The damping behavior of the line choke is modified by changing the electrical parameters of the parallel RC circuit. By adjusting the resistance and capacitance values, the resonant peak is suppressed while maintaining the line choke's ability to filter high-frequency interferences, resolving the contradiction between feedback reduction and overvoltage prevention
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 solution effectively reduces overvoltages to one-fifth of their original value and significantly minimizes feedback, allowing for a low-loss auxiliary circuit that can suppress resonant currents to less than 1% of the useful current, making the energy supply more stable and reducing harmonic distortion.
Implementation Method 1
a resonant current suppression circuit (RCS circuit) having a bandpass characteristic and configured to resonate with resonant currents generated by the line choke in such a way that voltage increases generated by the resonance circuits are reduced or suppressed
Implementation Method 2
The resonant current suppression circuit (RCS circuit) includes a coil and a capacitor
Implementation Method 3
The resonant current suppression circuit (RCS circuit) includes a coil and a capacitor
Data Source
AI summary
A filter circuit for reducing feedback of a consumer on an energy supply is disclosed. This filter circuit includes a multipolar input, a line choke, and a multipolar output, wherein the input is configured to receive an AC voltage from the energy supply, wherein the output is configured to be connected to the consumer, wherein the line choke includes one coil for each pole of the input, and wherein the coils of the line choke are each connected between one pole of the input and one pole of the output and energy is transferred from the input to the output and/or vice versa. A resonant current suppression (RCS) group is connected in parallel to a coil of the line choke to transmit resonant currents arising at the line choke such that voltage increases generated by the resonant currents are reduced or suppressed by the at least one RCS circuit.