(source: ) (full schematic ) To be precise, it is about the above CLC filter. I found an example of electronical design that is interesting for me because of something that I cannot understand. Thus we, get the desired pure dc output at the load.Hello! I am trying to analize basic low-pass filters. Inductor L − This inductor offers low reactance to dc components, while blocking the ac components if any got managed to pass, through the capacitor C 1.Ĭapacitor C 2 − Now the signal is further smoothened using this capacitor so that it allows any ac component present in the signal, which the inductor has failed to block. After grounding the ac components present in the signal, the signal passes to the inductor for further filtration. In this circuit, we have a capacitor in parallel, then an inductor in series, followed by another capacitor in parallel.Ĭapacitor C 1 − This filter capacitor offers high reactance to dc and low reactance to ac signal. The figure below shows a circuit for $\pi$ filter (Pi-filter). If needed, several identical sections can also be added to this, according to the requirement. A capacitor in parallel, then an inductor in series, followed by another capacitor in parallel makes this circuit. Here, two capacitors and one inductor are connected in the form of π shaped network. It has capacitor at its input and hence it is also called as a Capacitor Input Filter. This is another type of filter circuit which is very commonly used. The output of this filter is a better one than the previous ones. This filter is also called as a Choke Input Filter as the input signal first enters the inductor. Now, from that signal, few more ac components if any present are grounded so that we get a pure dc output. The rectified output when given to this circuit, the inductor allows dc components to pass through it, blocking the ac components in the signal. The figure below shows the circuit diagram of a LC filter. L-C FilterĪ filter circuit can be constructed using both inductor and capacitor in order to obtain a better output where the efficiencies of both inductor and capacitor can be used. Now, let’s try to use both of them to make a better filter. The above filter types discussed are constructed using an inductor or a capacitor. The remaining dc components present in the signal are collected at the output. The rectified output when passed through this filter, the ac components present in the signal are grounded through the capacitor which allows ac components. Shunt Capacitor FilterĪs a capacitor allows ac through it and blocks dc, a filter called Shunt Capacitor Filter can be constructed using a capacitor, connected in shunt, as shown in the following figure. The rectified output when passed through this filter, the inductor blocks the ac components that are present in the signal, in order to provide a pure dc. The figure below shows the circuit of a series inductor filter. Series Inductor FilterĪs an inductor allows dc and blocks ac, a filter called Series Inductor Filter can be constructed by connecting the inductor in series, between the rectifier and the load. Let us try to construct a few filters, using these two components. We have already studied in Basic Electronics tutorial that The following figure shows the functionality of a filter circuit.Ī filter circuit is constructed using two main components, inductor and capacitor. So, we need a circuit that smoothens the rectified output into a pure dc signal.Ī filter circuit is one which removes the ac component present in the rectified output and allows the dc component to reach the load. This ac component has to be completely removed in order to get pure dc output. The ripple in the signal denotes the presence of some AC component. We have also observed that the ripple factor of a half wave rectifier is greater than that of a full wave rectifier. The outputs of all these rectifier circuits contains some ripple factor. Till now, we have seen different types of rectifier circuits. A rectifier helps in converting a pulsating alternating current to direct current, which flows only in one direction. The power supply block diagram clearly explains that a filter circuit is needed after the rectifier circuit.
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