Automatic Power Factor Controller using Microcontroller
The thirst for new sources of energy is unquenchable, but we seldom realize that we are wasting a part of the electrical energy every day due to the lagging power factor in the inductive loads we use. Hence there is an urgent need to avoid this wastage of energy.
Before getting into the details of Power factor correction, lets just brush our 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 closer the value of P.F to unity, better is the utility of energy or lesser is the wastage. In electrical terms Power factor is basically defined as the ratio of the active power to reactive power or it is the phase difference between voltage and current. Active power performs useful work while Reactive power does no useful work but is used for developing the magnetic field required by the device.
Most of the devices we use have power factor less than unity. Hence there is a requirement to bring this power factor close to unity. Here we are presenting a prototype for automatic power factor correction using PIC Microcontroller.
The 230 V, 50 Hz is step downed using voltage transformer and current transformer is used to extract the waveforms of current. The output of the voltage transformer is proportional to the voltage across the load and output of current transformer is proportional to the current through the load. These waveforms are fed to Voltage Comparators constructed using LM358 op-amp. Since it is a zero crossing detector, its output changes during zero crossing of the current and voltage waveforms. These outputs are fed to the PIC which does the further power factor calculations.
Power Factor Correcting capacitor connected parallel to load through relay, if the relay is energized by microcontroller it will connect the capacitor parallel with load, if relay deenergized it will remove the capacitor from the load. When the resistive load is on the power factor will be near to unity so the microcontroller doesn’t energize the relay coil. When the inductive load is on the power factor decrease now the microcontroller energize the relay coil in order to compensate the excessive reactive power. Hence according to the load the power factor is corrected.
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