![]() The circuit diagram of a full wave rectifier with a series inductor filter is given below. All the combinations and their working are explained in detail below. Capacitor is used so as to block the dc and allows ac to pass. Inductor is used for its property that it allows only dc components to pass and blocks ac signals. The filter circuit can be constructed by the combination of components like capacitors, resistors, and inductors. Thus the output of the filter circuit will be a steady dc voltage. The filter is a device that allows passing the dc component of the load and blocks the ac component of the rectifier output. ![]() Thus, the output of the rectifier has to be passed though a filter circuit to filter the ac components. If the rectifier output is smoothened and steady and then passed on as the supply voltage, then the overall operation of the circuit becomes better. For most applications the supply from a rectifier will make the operation of the circuit poor. For most supply purposes constant dc voltage is required than the pulsating output of the rectifier. Such supply is not useful for driving complex electronic circuits. The ripples will be minimum for 3-phase rectifier circuits. These ripples will be the highest for a single-phase half wave rectifier and will reduce further for a single-phase full wave rectifier. Apart from the dc component, this pulsating dc voltage will have unwanted ac components like the components of its supply frequency along with its harmonics (together called ripples). The resulting series and parallel coil configurations make them much more flexible.We have learnt in rectifier circuits about converting a sinusoidal ac voltage into its corresponding pulsating dc. Finally, it is possible to create transformers with multiple primaries and secondaries (via either separate coils or multi-tapped coils). Transformers that decrease the voltage are referred to as step-down while those that increase the voltage are referred to as step-up. In reality, transformers do have voltage and current limits, and they are specified in terms of a volt-amp or VA rating which is simply the product of the nominal secondary voltage and maximum allowed secondary current. It simply transforms the power from high-voltage/low-current to low-voltage/high-current (or vice versa), hence the name. ![]() This implies that in the ideal case there is no power lost within the transformer. For example, if the secondary-side coil has half as many turns as the primary-side coil then the secondary voltage will be half of the primary voltage and its current will be twice as large as the primary current. Ideally, the voltage is decreased and the current is increased by the ratio of the number of loops between these coils. This flux induces a current in the secondary coil. The current in the primary-side coil creates a magnetic flux in the core. Each side is made up of a coil of wire and these coils are wound around a common magnetic core. In simple terms, a transformer has an input side, or primary, and an output side, or secondary. While a complete exploration of transformers is beyond the scope of this chapter, we can present the basics. The aforementioned voltage scaling issue can be addressed through the use of a transformer. The second item involves smoothing the pulsating DC to produce a constant value, much like a battery. In many cases this means lowering the voltage although there are some applications such as high power amplifiers where the voltage will need to be increased. The first item is the issue of scaling the 120 VAC RMS outlet voltage to a more useful level. On a practical note, there are still two items to consider when it comes to converting AC to DC. \): Transient analysis for halfwave rectifier.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |