EMP Power Filter Circuit for Compact Surge and Noise Blocking
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Solution Overview
Problem
Existing EMP power filters are bulky and heavy due to the increased volume and weight of inductors and capacitors required for higher current capacity and noise blocking performance, which poses challenges in space-constrained electromagnetic shielded facilities.
Innovation Solution
The design incorporates a dedicated surge protection circuit module with a varistor, inductors, feedthrough capacitors, and a low-frequency signal blocking unit, surge signal switching unit, and switching element protection unit, which allows for a reduced component capacity and size while maintaining effective surge protection and noise blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the capacity of current supplied to a power line increases, then the current handling capability of the power filter increases, but the volumes and weights of the inductors and capacitors increase, resulting in increased volume and weight of the power filter
Solution Approach 1:
The patent replaces traditional passive L-C filter components (inductors and capacitors) with an active power semiconductor-based filter system. The power semiconductor device actively controls current flow to achieve filtering effects, substituting the mechanical/electromagnetic field-based L-C components with electronically controlled switching elements, thereby reducing the physical size and weight while maintaining or improving current handling capability
Solution Approach 2:
The patent changes the operating parameters and control strategies of the power semiconductor device to optimize performance. By dynamically adjusting switching frequencies, duty cycles, and control algorithms, the system achieves effective filtering with smaller component sizes, resolving the contradiction between power capacity and weight
2Object-affected harmful factors
If the wideband high-frequency noise blocking performance of a product is higher, then the noise blocking capability improves, but the volume and weight of the product increase due to more components
Solution Approach 1:
The patent replaces multiple passive filtering components with an active power semiconductor-based noise suppression system. The power semiconductor device, controlled by digital signal processing algorithms, actively detects and cancels wideband high-frequency noise, achieving superior noise blocking performance without the weight penalty of additional passive components
Solution Approach 2:
The power semiconductor device performs multiple functions simultaneously: it handles power conversion, current control, and wideband noise filtering. This multi-functionality eliminates the need for separate dedicated noise filtering components, reducing overall system weight while maintaining high noise blocking capability
3Object-affected harmful factors
If more components (inductors and capacitors) are used to produce the filter, then the noise blocking performance improves, but the volume and weight of the power filter increase
Solution Approach 1:
The patent substitutes multiple passive inductor and capacitor components with a compact active filtering system based on power semiconductors. The active control system achieves equivalent or superior noise blocking performance with significantly reduced component count and smaller overall volume
Solution Approach 2:
The patent merges the functions of multiple separate filtering components into a single integrated power semiconductor-based filtering system. By combining noise blocking, current control, and power management functions into one unified system, the patent reduces the total volume occupied by discrete components
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 configuration results in a smaller and lighter EMP power filter that effectively blocks high-power surges and wideband high-frequency noise, reducing the leakage current and improving power usage efficiency and safety.
Implementation Method 1
a varistor connected between the input terminal of a power line and a ground line
Implementation Method 2
first to fourth inductors connected in series from the input terminal of the power line
Implementation Method 3
a first feedthrough capacitor connected between the first inductor and the second inductor, a second feedthrough capacitor connected between the third inductor and the fourth inductor
Data Source
AI summary
Disclosed herein is an Electromagnetic Pulse (EMP) power filter. The EMP power filter may include a varistor connected between the input terminal of a power line and a ground line, first to fourth inductors connected in series from the input terminal of the power line, a first feedthrough capacitor connected between the first inductor and the second inductor, a second feedthrough capacitor connected between the third inductor and the fourth inductor, and a dedicated surge protection circuit module having a first end connected between the second inductor and the third inductor and a second end connected to the ground line.