Abstract
The objective of this paper is to prove the relationship between the Total Harmonics Disturbance emission of lamps network and the number of lamps. In the lighting field the LED lighting emission diode is the absolutely winner. The low power consumption and the characteristics of LED made it ideally for most of indoor and outdoor applications. The dimmability of the LEDs which is between 0% and 100% made it ideally for intelligent lighting applications. This large dimmability range could be obtained only with incandescent and halogen bulbs, compare to CFL compact fluorescent lamps where the maximum dimmability is around of 60%. One of the prices of this positive characteristics of modern lamps, is the electromagnetic compatibility EMC. It is well known that the modern lamps have a common part, and this is the electronic ballast. And as all electronics circuits, the electronic ballasts are an important source of EMC noise emission. The noise emission of electronic ballast is mainly conducted emission type. Start from construction of electronic ballast which contains an AC/DC converter and a buffer capacitor the emission of half harmonics is presented too. The emission of half harmonics is proportionally with the cost of lamps, because the cost of lamps depends by the methods used for noise emission rejection too. Typically the cheaper lamps have a higher noise emission than the expensive lamps. Known of noise emission lamps separately is not enough for characterization of low noise emission from lighting network. The low frequency noise emission of a lighting network is lower than in case of a single lamp. The variation of temperature determines a variation of low frequency noise emission too.
Highlights
INTRODUCTIONThe type of load determines the waveform of the current which should be quite complex, but this fact depend by the interaction between the components of the system too
In case of nonlinear loads, the drawn current is not a sinusoidal current
Harmonic emission of some cheaper LED lamps could be higher than emission of compact fluorescent lamps
Summary
The type of load determines the waveform of the current which should be quite complex, but this fact depend by the interaction between the components of the system too. The results of it is a low frequency noise emission in EMC field [1]. In case when the impedance of the voltage source is low, the voltage harmonics produced by current harmonics will be low level. This is the case when voltage harmonics are small compared to current harmonics. Where Vn is the RMS voltage of k-th voltage harmonic; In is the RMS current of the k-th current harmonic; k=1 fundamental frequency
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