Active Pfc Power Supply Meaning

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.

Active pfc power supply meaning.

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. Pfc power factor correction. They have a built in active pfc function. 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. A pfc power supply is a device that ensures power for electronic equipment is efficiently used. 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. 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.

Your computer uses a power supply that utilizes active power factor correction active pfc to improve efficiency. Switching power supplies without power factor correction draw current in short high magnitude pulses. The power supplies offer high efficiency to 94 5 cc cv and cp modes. This method provides a more efficient correction is lighter and less bulky.

These pulses can be smoothed out by using active or passive techniques. For any power supply design over 100w the preferable type of pfc is active power factor correction active pfc since it provides a lighter and more efficient power factor control. At 602x441x258mm it offers up to 10 outputs and has a built in active pfc function. But active pfc is also more efficient in the use of power compared to passive pfc.

Reactive power has no real value for an electronic device but electric companies charge for both true and reactive power resulting in unnecessary charges. One disadvantage of active pfc is. It also reduces the cost of electricity by minimizing the amount of reactive power produced by computers and other devices. 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.

The closer the pf comes to being 1 0 the better the performance of the power supply. The active pfc methods are preferred for power supplies of over 100w. Specifications taken from the packaging of a 610 w pc power supply showing active pfc rating. Active pfc circuits are the most popular are built into the switchmode power supply and can increase the pf to 0 98 or higher.

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. Active power factor correction automatically corrects for ac input voltage and is capable of a wide range of input voltage. Input voltage is 187 277vac single or 3 phase and an optional 277 480vac 3 phase.