EMC (Electromagnetic Compatibility) filters are used to ensure that electrical and electronic equipment does not generate, or is not affected by, electromagnetic disturbance. EMC filters are produced using deceptively simple combinations of inductors, capacitors and resistors.
Why EMC filter is used?
EMC components such as filters and chokes are used to limit conducted electromagnetic interfer- ence to a level specified in EMC plans, or to reduce it below the limits set in the standards. EPCOS offers EMC components for both power lines and for signal and control lines in a wide range of voltages and currents.
How does an EMC filter work?
The idea is that the interfering signals generally have a frequency above that of the signals normally travelling along the wire or line. By having what is termed a low pass filter as the EMC filter, only the low frequency signals are allowed to pass, and the high frequency interference signals are removed.
Why do VFD cause harmonics?
The voltage harmonics generated by VFDs are due to the flat-topping effect caused by a weak ac source charging the dc bus capacitor without any intervening impedance. The distorted voltage waveform gives rise to voltage harmonics, which is of more importance than current harmonics.
What is EMC stands for?
Electromagnetic Compatibility
Electromagnetic Compatibility (EMC) and Radio Frequency (RF) Testing. Electromagnetic Compatibility, also known as EMC, is the interaction of electrical and electronic equipment with its electromagnetic environment, and with other equipment. All electronic devices have the potential to emit electromagnetic fields.
Can an EMI filter go bad?
The types of disturbances that can damage an EMI filter are not limited to overvoltages such as voltage surges, voltage transients, temporary overvoltages, and voltage swells. Voltage distortion, voltage notching, and various types of undervoltages can also cause permanent damage to EMI filters.
What is the difference between RC and LC filters?
RC is fine for filtering low power signals. LC is fine for filtering high power signals.
What is L type filter?
Definition: Choke filter consists of an inductor connected in series with rectifier output circuit and a capacitor connected in parallel with the load resistor. It is also called L-section filter because the inductor and capacitor are connected in the shape of inverted L. Thus, ripples get filtered through choke coil.
What is 12-pulse VFD?
12-pulse vfd 12-pulse VFDs, as shown in figure 2, consists of 12-pulse rectifier, formed by connecting two six-pulse rectifiers in parallel to feed the same dc bus voltage. These rectifiers are fed through a transformer with two secondary windings: one ∆ and one y.
Do VFDs create harmonics?
The voltage harmonics generated by VFDs are due to the flat-topping effect caused by a weak ac source charging the dc bus capacitor without any intervening impedance. The distorted voltage waveform gives rise to voltage harmonics, which is of more importance than current harmonics. The reason is simple.
What does the C stand for in EMC?
An equation derived by the twentieth-century physicist Albert Einstein, in which E represents units of energy, m represents units of mass, and c2 is the speed of light squared, or multiplied by itself. (See relativity.)
