midarkmind :
Hello, I just moved to Germany and I was going to plug my computer into the wall when I noticed that my PS did not have a red selector switch. Is this normal? Its a new PS so I thought that this was going to be European compatible just like my laptop. Here is the model number:XION Power Real XON-1250P14HE 1250W ATX. I went to the website and it states that the PS runs on mains 110 to 220. I am not sure if that means weather or not it will be adaptive to the German wall outlets, but I don't want to just plug it in to find out ether. =) Please let me know, thanx.
Active PFC ( Power Factor Correction ) has nothing to do with input voltage compatibility. It is the ratio of real power to apparent power in the ciruit. The real power is the capacitive component of the circuit... While the apparent power is the product of current and votage. Higher power factor means higher efficiency of the power supply unit.
Switching supplies are generally LOW Power Factor linear rectifiers. Active PFC (inductive/capacitive networks) are employed to correct or increase the power factor of the circuit. PC Power supplies are switching type that's the reason why Active PFC are employed.
"I has nothing to do with what is Called in the Industry as AUTO VOLT ... Meaning adaptable to All AC Voltage Ratings and Frequency"
"AGAIN ACTIVE PFC HAS NOTHING TO DO WITH VOLTAGE COMPATIBILITY BET US & EU"
Both are electrical AC parameter PFC & Input voltage... PFC is highly dependent on Capacitance, Inductance and Resistance of the circuit or network.
US single phase input voltage is 110V 60 HZ, EU is 220/240 50 HZ....
For a PSU to be compatible for US and EU it must clearly stipulate in minimum as:
100/240V, 50/60HZ.... The input voltage and operating input frequency must be very clear. The US input freq is 60HZ... EU's input freq is 50 HZ. Take note for example that there are other countries that operates 220VAC @ 60HZ and is not compatible with EU.
Here is a simplified PFC concept for understanding of common people PFC concepts of its theory:
http://en.wikipedia.org/wiki/Power_factor
Other than that computations require calculus and differential equation
For the specific PSU you are asking:
If what is posted in NewEgg Details is correct then that PSU will work:
Freq: 47 HZ to 63 HZ
Input Voltage: 115V to 240V
http://www.newegg.com/Product/Product.aspx?Item=N82E16817190026
I question the reliability of XION brand supply.... I don't recommend this specific brand.