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Harmonic

About: Harmonic is a research topic. Over the lifetime, 44833 publications have been published within this topic receiving 495922 citations. The topic is also known as: overtone & partial.


Papers
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Proceedings ArticleDOI
18 Jun 2006
TL;DR: This paper deals with carrier-based PWM, where harmonic injection enables an improvement in the dc bus utilisation without moving into the over-modulation region, while still providing sinusoidal output phase voltages.
Abstract: Application of power electronics in electric drives enables utilisation of ac machines with a phase number higher than three Such multi-phase motor drives are nowadays considered for various applications Multi-phase drives are invariably supplied from multi-phase voltage source inverters (VSIs) and adequate methods for VSI pulse width modulation (PWM) are therefore required This paper deals with carrier-based PWM, where harmonic injection enables an improvement in the dc bus utilisation without moving into the over-modulation region, while still providing sinusoidal output phase voltages A generalised concept of n th harmonic injection for n-phase inverters is presented The viability of the proposed concept is proved by simulation taking five-phase VSI as an example The method of fifth-harmonic injection in five-phase VSIs enables operation with pure sinusoidal voltages up to a certain reference voltage value which is smaller than the maximum achievable with the given dc link voltage Sinusoidal PWM is further modified, by injecting other harmonics, in order to enable full utilisation of the dc bus voltage The correlation of this PWM scheme with space vector PWM, based on utilisation of large vectors only, is established in this way Some experimental results, illustrating application of the sinusoidal PWM in series-connected five-phase two-motor drives, are included

139 citations

Patent
02 May 1994
TL;DR: In this paper, a system and method for control and delivery of radio frequency power in plasma process systems is presented, which monitors the power, voltage, current, phase, impedance, harmonic content and direct current bias of the radio frequency energy being delivered to the plasma chamber.
Abstract: The present invention relates to a system and method for control and delivery of radio frequency power in plasma process systems. The present invention monitors the power, voltage, current, phase, impedance, harmonic content and direct current bias of the radio frequency energy being delivered to the plasma chamber. In addition, the plasma mode of operation may be controlled by creating either a capacitively or inductively biased radio frequency source impedance. A radio frequency circulator prevents reflected power from the plasma chamber electrode to damage the power source and it further dissipates the reflected power in a termination resistor. The termination resistor connected to the circulator also effectively terminates harmonic energy caused by the plasma non-linearities. Multiple plasma chamber electrodes and radio frequency power sources may be similarly controlled.

139 citations

Journal ArticleDOI
TL;DR: In this article, a power divider integrated with high-selectivity bandpass resoponses is proposed to realize the dual functions of the power division and filtering, where two transmission zeros are generated near the passband edges and another one is created at the second harmonic frequency which enhances the rejection levels.
Abstract: This letter presents a compact power divider integrated with high-selectivity bandpass resoponses. A novel topology is proposed to integrate five resonators and a resistor to realize the dual functions of the power division and filtering. Two transmission zeros are generated near the passband edges and another one is created at the second harmonic frequency which enhances the rejection levels. For validation, a filtering power divider operating at 920 MHz is implemented with more than 20 dB isolation. The circuit size is 0.15 λg×0.14 λg, featuring compact size.

139 citations

Journal ArticleDOI
TL;DR: In this paper, a fuzzy logic based robust active power filter is proposed to minimize the harmonics for wide range of variations of load current under stochastic conditions, which is also capable of maintaining the compensated line currents balanced, irrespective of the unbalance in load currents.

139 citations

Journal ArticleDOI
TL;DR: A low Terahertz frequency generator is realized in 90 nm CMOS by linearly superimposing quadruple (N=4) phase shifted fundamental signals at one fourth of the output frequency by linear superposition (LS) technique.
Abstract: A low Terahertz (324 GHz) frequency generator is realized in 90 nm CMOS by linearly superimposing quadruple (N=4) phase shifted fundamental signals at one fourth of the output frequency (81 GHz). The developed technique minimizes the fundamental, second and third order harmonics without extra filtering and results in a high fundamental-to-4 th harmonic signal conversion ratio of 0.17 or -15.4 dB. The demonstrated prototype produces a calibrated -46 dBm output power when biased at 1 V and 12 mA with 4 GHz tuning range and extrapolated phase noise of -91 dBc/Hz at 10 MHz frequency offset. The linear superposition (LS) technique can be generalized for all even number cases (N=2k, where k=1,2,3,4,...,n) with different tradeoffs in output power and frequency. As CMOS continues to scale, we anticipate the LS N=4 VCO to generate signals beyond 2 Terahertz by using 22 nm CMOS and produce output power up to -1.5 dBm with 1.7% power added efficiency with an LS VCO + Class-B Power Amplifier cascaded circuit architecture.

139 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
20231,223
20222,724
20211,878
20202,330
20192,612
20182,495