A Wideband Low-Pass Filter for Differential Mode Distortion

This paper deals with the solution for a wideband low-pass filter that can be used for filtering the input currents of switching converters, which are distorted by the switching frequency of PWM. Initially, the filter was proposed for the special type of AC converter, which is described in the paper. However, these solutions can also be used in the inputs of active PFC converters and in the outputs of PWM converters, where there are similar problems with switching frequency.The frequency band of the filter is given by the switching frequency of the filtered device and by the demands of EMC standards. This makes the filter able to work in the frequency band from 10 kHz to 30 MHz. To ensure such a frequency band, the filter should be proposed with two sections, each for a specific part of the band.

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Differential-Mode Low-Pass Filter Using Hybrid CPS and G-CPS With Intrinsic Common-Mode Rejection

IEEE Transactions on Microwave Theory and Techniques ◽

10.1109/tmtt.2019.2903459 ◽

2019 ◽

Vol 67 (5) ◽

pp. 1836-1843 ◽

Cited By ~ 3

Author(s):

Lin-Ping Feng ◽

Lei Zhu ◽

Songbai Zhang

Keyword(s):

Differential Mode ◽

Common Mode ◽

Pass Filter ◽

Low Pass Filter ◽

Low Pass

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Estimation of signal attenuation in the 60 GHZ band with an analog BiCMOS passive filter

International Journal of Microwave and Wireless Technologies ◽

10.1017/s1759078714000956 ◽

2014 ◽

Vol 7 (6) ◽

pp. 645-653

Author(s):

Johannes W. Lambrechts ◽

Saurabh Sinha

Keyword(s):

Frequency Band ◽

Integrated Circuit ◽

Oxide Semiconductor ◽

Oxygen Absorption ◽

60 Ghz ◽

Atmospheric Conditions ◽

Pass Filter ◽

Low Pass Filter ◽

Digital Architecture ◽

Low Pass

Prediction of millimeter(mm)-wave radio signals can be beneficial in recreating and repeating atmospheric conditions in a controlled, laboratory environment. A path-loss model has been proposed that accounts for free-space losses, oxygen absorption, reflection and diffraction losses, and rain-rate attenuation at mm-wave frequencies. Two variable passive low-pass-integrated circuit filter structures for attenuation in the 57–64 GHz unlicensed frequency band have been proposed, designed, simulated, prototyped in a 130-nm SiGe bipolar complementary metal-oxide semiconductor process, and measured. The filters are based on the Butterworth and Chebyshev low-pass filter topologies and investigate the possibility of using the structures to perform amplitude attenuation of mm-wave frequencies over a short distance. Both filters are designed and matched for direct coupling with equivalent circuit models of dipole antennas operating in this frequency band. Full integration therefore allows prediction of atmospheric losses on an analog, real-time, basis without the requirement of down-converting (sampling) to analyze high-frequency signals through a digital architecture. On-wafer probe measurements were performed to limit parasitic interference from bonding wires and enclosed packaging.

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Robust Sliding Mode Control of a Unipolar Power Inverter

Energies ◽

10.3390/en14175405 ◽

2021 ◽

Vol 14 (17) ◽

pp. 5405

Author(s):

Muhammad Awais ◽

Abdul Rehman Yasin ◽

Mudassar Riaz ◽

Bilal Saqib ◽

Saba Zia ◽

...

Keyword(s):

Electromagnetic Interference ◽

Sliding Mode ◽

Practical Implementation ◽

Switching Frequency ◽

Sigmoid Function ◽

Pass Filter ◽

Low Pass Filter ◽

Pulse Width Modulated ◽

Simulation Based ◽

Low Pass

The key issue in the practical implementation of the sliding mode (SM) control–based power inverter is the variable switching frequency. This variable switching frequency not only induces electromagnetic interference (EMI) noise, but also reduces the efficiency of the inverter, as the size of the inductor and capacitor does not alter in tandem with this variable frequency. In this context, fixed switching frequency–based SM control techniques are proposed; however, some of them are too complex, while others compromise the inherent properties of SM control. In this research, a fixed frequency SM controller is proposed, which is based on the novel low-pass filter extraction of the discontinuous control signal. This allows the technique to be implemented with fewer hardware components, thus reducing the complications of implementation, while maintaining the robustness and parametric invariance of SM control. A simulation-based comparison with an existing pulse width modulated (PWM) SM controller is presented as the benchmark. In comparison with the sigmoid function SM controller, an improvement of 50% in the settling time along with zero steady-state errors and a further 37% and 42% improvement in the undershoot and overshoot, respectively, is reported in the simulation. A hardware setup is established to validate the proposed technique, which substantiates the simulation results and its disturbance rejection properties.

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A Multiple Frequency Band Watermarking Algorithm Based on Stripe Image

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.926-930.2893 ◽

2014 ◽

Vol 926-930 ◽

pp. 2893-2897

Author(s):

Bin Bing Liu ◽

Hai Qing Chen

Keyword(s):

Error Correction ◽

Frequency Band ◽

Image Coding ◽

Blind Watermarking ◽

Multiple Frequency ◽

Pass Filter ◽

Low Pass Filter ◽

Low Pass ◽

Embedding Strategy ◽

High Pass

In this paper, a multiple frequency band watermarking algorithm based on stripe image is proposed. The algorithm converts watermark string representing the copyright of image works to stripe image before embedding it to host image. Because of the error correction ability of the stripe image, the algorithm takes on high robustness. This paper also proposed a multiple frequency band embedding strategy through analyzing and classifying various watermark attacking algorithm. Applying this algorithm, watermark can stand several kinds of attacks such as low pass filter and high pass filter. Experimental results show that a blind watermarking algorithm with high robustness to various watermark attacking can be achieved through combining stripe image coding and multiple frequency band strategy.

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