Active Pfc Power Supply Meaning

Also known as power factor controller is a feature included in some computer and other power supply boxes that reduces the amount of reactive power generated by a computer.

Active pfc power supply meaning.

These pulses can be smoothed out by using active or passive techniques. Your computer uses a power supply that utilizes active power factor correction active pfc to improve efficiency. Although computer power supplies draw only a fraction of their full capacity during it s steady state normal operation pfc power supplies have the potential to draw their full capability during initial inrush. The power supplies offer high efficiency to 94 5 cc cv and cp modes.

They have a built in active pfc function. Pfc power factor correction. Active power factor correction automatically corrects for ac input voltage and is capable of a wide range of input voltage. Power factor correction is a circuit design technique to increase the power factor of a device so that it approaches 1 or unity power factor.

Reactive power operates at right angles to true power and energizes the magnetic field. Power supplies with active pfc may experience incompatibility problems with a ups that does not provide pure sine wave power output when the power supply switches from ac power to ups battery power. Some types of the active pfc are buck boost buck boost and synchronous condenser. A pfc power supply is a device that ensures power for electronic equipment is efficiently used.

Specifications taken from the packaging of a 610 w pc power supply showing active pfc rating. At 602x441x258mm it offers up to 10 outputs and has a built in active pfc function. Active pfc circuits are the most popular are built into the switchmode power supply and can increase the pf to 0 98 or higher. Input voltage is 187 277vac single or 3 phase and an optional 277 480vac 3 phase.

Switching power supplies without power factor correction draw current in short high magnitude pulses. The power factor correction is a technique of increasing the power factor of a power supply. Active pfc is the use of power electronics to change the waveform of current drawn by a load to improve the power factor. Active pfc is comprised of a switching regulator operating at a high switching frequency being able to generate a theoretical power factor of over 95.

The active pfc methods are preferred for power supplies of over 100w. It also reduces the cost of electricity by minimizing the amount of reactive power produced by computers and other devices. One disadvantage of active pfc is. The pfc power supply should be connected to an uninterruptible power supply to ensure the devices have suitable power in case the main power source goes out.

This method provides a more efficient correction is lighter and less bulky. The closer the pf comes to being 1 0 the better the performance of the power supply. A basic active pfc circuit consists of a control circuit that measures the input voltage and current and then adjusts the switching time and duty cycle to ensure that the input voltage and current are in phase.