Smart Voltage Stabilizer Using PIC16F877A
Voltage stabilizers are used for many appliances in homes, offices and industries. The mains supply suffers from large voltage drops due to losses on the distribution lines en route. A voltage stabilizer maintains the voltage to the appliance at the nominal value of around 220 volts even if the input mains fluctuates over a wide range. Here is the circuit of an automatic voltage stabilizer that can be adapted to any power rating. Its intelligence lies in the program on PIC16F877A—a low-cost microcontroller that is readily available. The circuit, when used with any appliance, will maintain the voltage at around 220V even if the input mains voltage varies between 180V and 250V. Here the circuit is shown for a 5A stabilizer. It acts within 100ms to produce a smoothly varying output whenever input mains voltage changes. (Servo stabilizers move a variable...