The waveform of DC output signal with a filter and without filter is shown in the below diagram.Ĭharacteristics of Choke filter or L-section filter Waveform of Choke Filter or L-section Filter If the inductor of high inductive reactance (X L), greater than the capacitive reactance at ripple frequency is used than filtering efficiency gets improved. Now, the DC output signal is free from AC components, and this regulated DC can be used in any application. These ripples are then removed by the capacitor connected in parallel to the load resistor. Thus, the AC ripples get blocked by inductor coil.Īlthough the inductor efficiently removes AC ripples, a small percentage of AC ripples is still present in the filtered signal. This is because DC resistance of an inductor is low and AC impedance of inductor coil is high. The inductor has the property to block AC and pass DC. When the pulsating DC signal from the output of the rectifier circuit is feed into choke filter, the AC ripples present in the output DC voltage gets filtered by choke coil. Working of Choke Filter or L-section filter In this article, we will discuss the working of L-section or choke filter and in next article, we will discuss Pi filter in detail. The combination results in two types, i.e. The combination of series inductor filter and shunt capacitor filter is generally used for most of the applications. The voltage stabilization property of shunt capacitor filter and current smoothing property of series inductor filter is utilized for the formation of choke filter or L-section filter. This can be achieved by using the combination of series inductor filter and shunt capacitor filter. Thus, for better performance, we need a filter circuit in which ripple factor is low and do not vary with the variation in load resistance. It implies that in shunt capacitor filter the ripple factor decreases with increase in load resistance and increases with the decrease in load resistance. And in the case of shunt capacitor, the ripple factor is inversely proportional to the value of load resistance. Moreover, the ripple factor of series inductor filter is directly proportional to the load resistance it means as the load resistance increases, ripple factor also starts increasing. The excess of current in a diode may lead to its destruction. And the shunt capacitor filter performs filtering efficiently but increases the diode current. A series inductor filter filters the output current but reduces the output current (RMS value and Peak value) up to a large extent. Design properly damped multi-stage input filters.Significance of Choke Filter or L-section filterĬhoke filter came into existence due to shortcomings of the series inductor and shunt capacitor filter.Design properly damped single-stage input filters.Understand input filter design principles based on attenuation requirements and impedance interactions.Understand conducted electromagnetic interference (EMI) and the need for input filter.Techniques of Design-Oriented Analysis (ECEA 5706)Īfter completing this course, you will be able to:.Averaged-Switch Modeling and Simulation (ECEA 5705).Introduction to Power Electronics (ECEA 5700).We strongly recommend students complete the CU Boulder Power Electronics specialization as well as Courses #1 (Averaged-Switch Modeling and Simulation) and #2 (Techniques of Design-Oriented Analysis) before enrolling in this course (the course numbers provided below are for students in the CU Boulder's MS-EE program): You will be able to design properly damped single and multi-section filters to meet the conducted EMI attenuation requirements without compromising frequency responses or stability of closed-loop controlled power converters. After completion of this course, you will gain an understanding of issues related to electromagnetic interference (EMI) and electromagnetic compatibility (EMC), the need for input filters and the effects input filters may have on converter responses. This is Course #3 in the Modeling and Control of Power Electronics course sequence. This course can also be taken for academic credit as ECEA 5707, part of CU Boulder’s Master of Science in Electrical Engineering degree.
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