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#44700 - 11/10/04 01:26 AM 50hz PC  
Ram  Offline
Junior Member
Joined: Nov 2004
Posts: 2
I am using a desktop pc here in china with a 220 volts/50 hz. power supply.

Is it OK to use that PC in the Philippines which has 220 volts/60 hz. without harming my PC? Since the 2 place have a different frequency standard...

* pc doesnt have any frequency switch selector ;(

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#44701 - 11/10/04 02:04 AM Re: 50hz PC  
hbiss  Offline
Joined: Dec 2003
Posts: 886
Hawthorne, NY USA
Maybe, maybe not. And no, you will never see a "frequency" switch.

The first thing I would do is look at the nameplate and the instruction book. Computers are made for the world market and many will auto switch or have a voltage selector switch. If this is the case the different line frequencies will not matter either.

If you really want to be sure otherwise I would contact the manufacturer. Switching power supplies could have problems with different line frequencies unless they are designed for it.


#44702 - 11/10/04 02:17 AM Re: 50hz PC  
Ram  Offline
Junior Member
Joined: Nov 2004
Posts: 2
i already checked the plate where all the Power supply info is written. It says 50 hz.

I cross-checked some of the machines in the office and some of them has 50hz - 60hz capability. while mine is only at 50hz.

Does this hertz thing matters in this situation? or Is it only the voltage that is important?

#44703 - 11/10/04 07:22 PM Re: 50hz PC  
wa2ise  Offline
Joined: Nov 2002
Posts: 782
Oradell NJ USA
Most PCs use switching power supplies. And most of those power supplies convert the incoming AC into DC, then convert that to high frequency AC to feed a small high frequency transformer, then on the secondary side of that transformer convert it to various DC voltages (12V, 5V and such). Such supplies don't care about powerline frequency as they convert to DC anyway (rectifier diodes and filter caps). Most have a voltage selector switch, this rectifier/cap circuit is a voltage doubler (in 125V mode) or a bridge rectifier (in 250V mode). You could run it off of a DC source of 300VDC if it's set for 250V. The bridge rectifier would just automatically correct the input power's polarity and feed it to the filter caps.

Only if the supply has a circuit that does something about the harmonic content of the current it draws off the powerline could the powerline frequency matter, and most likely it could accomidate 50 or 60Hz anyway. The harmonic currents that tend to overload neutrals in a room full of servers fed by 3 phase 120V power.

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