# Automatic Power Factor Controller using PIC Microcontroller essay

Hence there is an urgent need to avoid this wastage o f energy. Before getting into the details of Power factor correction, lets just brush our k knowledge about the term “power factor’. In simple words power factor basically states how far the energy provided has been utilized. The maximum value of power factor is unity. So CLC user the value of P. F to unity, better is the utility of energy or lesser is the wastage. In electric al terms Power factor is basically defined as the ratio of the active power to reactive power or t is the phase difference between voltage and current.

These outputs are fed to the PICK which does the further power factor calculations. 2/18 Microelectronic Section PICK 16F877A microelectronic is the heart of this Automatic Power Factor Contra leer, it find, displays and controls the Power Factor.. To correct power factor, first we need to find the current power factor. It can be find by taking tangent of ratio of time between zero crossing of cue rent and voltage waveforms and two successive zero crossing of voltage w oviform. Then it displays the calculated power factor in the xx LCD Display and switches O

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N the capacitors if required. Correction Section When load is connected the power factor is calculated by the PICK microelectronic leer. Fifth calculated power factor is less than 0. 9 then the relay switches on the capacity or. The relays are switched using LUNGFUL (HTTPS://electroscope. Com/ uln2003highvoltagecurrentdriver/) which is basically a driver ICC. CLINICAL consists of seven DARLINGTON PAIRS. The current lead in capacitor compensates the corresponding current lag hi chi is usually present in loads. Hence the phase difference between the current and voltage will be reduced.

Power Factor Correcting capacitor connected parallel to load through relay, if the relay is energize by microelectronic it will connect the capacitor parallel with load, if relay denigrated it will remove the capacitor from the load. When the resistive load is on the power factor will be near to unity so the microelectronic doesn’t energize the relay coil. When the inductive load is on the power factor decrease now the microelectronic en regime the relay coil in order to compensate the excessive reactive power. Hence according to the load the power factor is corrected.