A Compact High-Efficiency Rectifier With a Simple Harmonic Suppression Structure

2020 ◽  
Vol 30 (12) ◽  
pp. 1177-1180
Author(s):  
Zhongqi He ◽  
Hang Lin ◽  
Huacheng Zhu ◽  
Changjun Liu
Keyword(s):  
High Efficiency ◽  
Harmonic Suppression

The Application of Active Power Filter in Harmonic Suppression and Reactive Power Compensation with Medium and Small Capacity

2012 ◽  
Vol 485 ◽  
pp. 239-244
Author(s):  
Wei Shi ◽  
Chuan Jin Huang ◽  
Chun Xiang Xu
Keyword(s):  
High Efficiency ◽  
Reactive Power ◽  
Reactive Power Compensation ◽  
Active Power ◽  
System Structure ◽  
Harmonic Suppression ◽  
Power Conservation ◽  
Three Phase ◽  
Practical Field ◽  
Small Capacity

Focusing on the harmonic suppression and reactive power compensation with the medium and small capacity, the paper gives the solution based on the economical three-phase four-switch APF which uses the instruction current detecting algorithm based on the active power conservation to achieve the detection in real time mode. The whole system structure, the hardware implementation and software workflow analysis for the control system are presented. Application in the practical field project proves that the designed product works in high efficiency steadily.

scholarly journals Design of 0.8–2.7 GHz High Power Class-F Harmonic-Tuned Power Amplifier with Parasitic Compensation Circuit

2017 ◽  
Vol 2017 ◽  
pp. 1-8 ◽  
Author(s):  
Zhiqun Cheng ◽  
Xuefei Xuan ◽  
Huajie Ke ◽  
Guohua Liu ◽  
Zhihua Dong ◽  
...  
Keyword(s):  
Power Amplifier ◽  
High Power ◽  
High Efficiency ◽  
Impedance Matching ◽  
Harmonic Suppression ◽  
Compensation Circuit ◽  
Third Harmonic ◽  
The Third ◽  
Saturated Output Power ◽  
Class F

The design, implementation, and measurements of a high efficiency and high power wideband GaN HEMT power amplifier are presented. Package parasitic effect is reduced significantly by a novel compensation circuit design to improve the accuracy of impedance matching. An improved structure is proposed based on the traditional Class-F structure with all even harmonics and the third harmonic effectively controlled, respectively. Also the stepped-impedance matching method is applied to the third harmonic control network, which has a positive effect on the expansion bandwidth. CGH40025F power transistor is utilized to build the power amplifier working at 0.8 to 2.7 GHz, with the measured saturated output power 20–50 W, drain efficiency 52%–76%, and gain level above 10 dB. The second and the third harmonic suppression levels are maintained at −16 to −36 dBc and −16 to −33 dBc, respectively. The simulation and the measurement results of the proposed power amplifier show good consistency.

Compact high efficiency circularly polarized rectenna based on artificial magnetic conductor

2019 ◽  
Vol 11 (9) ◽  
pp. 975-982
Author(s):  
Lin Li ◽  
Xue-Xia Yang ◽  
Geliang Zhu ◽  
Qi Luo ◽  
Steven Gao
Keyword(s):  
Conversion Efficiency ◽  
High Efficiency ◽  
Harmonic Suppression ◽  
Magnetic Conductor ◽  
Compact Structure ◽  
Pass Filter ◽  
Low Pass Filter ◽  
Circularly Polarized ◽  
Artificial Magnetic Conductor ◽  
Transmitting Antenna

AbstractA compact circularly polarized (CP) rectenna with low profile and high efficiency based on the artificial magnetic conductor (AMC) is proposed in this paper. The receiving CP antenna is a coplanar stripline fed dual rhombic loop with an AMC reflector. The proposed AMC reflector not only improves the antenna gain to 9.8 dBi but also decreases the profile to 0.1 λ0. The AMC reflector also makes the antenna have a harmonic suppression function so the low pass filter between the rectifying circuit and the antenna could be omitted and the rectenna has a compact structure. According to the measured results, the rectenna has the highest conversion efficiency of 76% on the load of 240 Ω with the received power of 117.5 mW. When the linearly polarized transmitting antenna is rotated, the conversion efficiency of the CP rectenna maintains a constant high conversion efficiency of 74%. The compact structure and CP operation of the rectenna made it a good candidate of the wireless battery for some electronic devices and far-distance microwave power transmission.

Study of Harmonic Suppression Method Based on the Class D Amplifier

2013 ◽  
Vol 273 ◽  
pp. 384-388
Author(s):  
Yu Guo ◽  
Wei Li
Keyword(s):  
Power Amplifier ◽  
Integrated Circuit ◽  
High Efficiency ◽  
Harmonic Distortion ◽  
Harmonic Suppression ◽  
Output Terminal ◽  
Class D Amplifier ◽  
Class D ◽  
Small Distortion ◽  
Harmonic Components

Class D power amplifier has the advantages of simple structure, small volume, high efficiency, large output power, and small distortion, therefore is applied widely in the audio power amplifier integrated circuit. But because of existing higher harmonic components, the total harmonic distortion (THD) is high. In this paper, for the characteristics of class D amplifier, a feed-forward control circuit is added to the amplifier output terminal, and a composite filter is used to inhibit output harmonics further. The simulation results show that, the method can reduce the system THD effectively and improve the performance of the amplifier.

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