Switching powersupply?

[Marks256]

How do the switching powersupplys work? Like if you have a device that is hooked up to household current, and the powergoes out, then the battery back-up kicks in, how does that work? Or when you unplug a laptop from the wall, and the battery will kick on, with-out disturbing the actual system?

 

[OutToLunch]

How do the switching powersupplys work? Like if you have a device that is hooked up to household current, and the powergoes out, then the battery back-up kicks in, how does that work?

That would be an uninterruptible power supply (UPS). A UPS will continue to supply AC when the AC from the There are a few different ways that the UPS can be used. The two most basic are offline and online.

In an offline UPS, the AC is fed directly into the load. If the service is interrupted, the electronics can quickly detect the interruption and start the inverter, which converters the DC battery voltage to AC which is then stepped up through a transformer whose output is connected to the load. These type of UPS will allow glitches to go through to the load and when the AC is interrupted, the transition is usually not smooth, though most loads don't care too much.

In an online UPS, the AC is converted into two high voltage DC rails (one positive and one negative). The DC is then used to create an AC voltage that is connected to the load. If the AC service is interrupted, the battery supplies the energy to maintain the DC rails. These UPS continually supply a clean AC to the load. No glitches will get through and if the service is interrupted, the load will never know it.

Or when you unplug a laptop from the wall, and the battery will kick on, with-out disturbing the actual system?

This is basically an AC to DC converter. The DC voltage is OR'd through a diode or semiconductor switch which will immediately allow the battery to supply the necessary power if the AC is removed.

 

[Marks256]

I knew what a UPS was, but i didn't know what it stood for. What does the circuit for the "quick switch" consist of?

 

[srimannarayanakarthik]

How do the switching powersupplys work? Like if you have a device that is hooked up to household current, and the powergoes out, then the battery back-up kicks in, how does that work? Or when you unplug a laptop from the wall, and the battery will kick on, with-out disturbing the actual system?

dont stess urself witha ll tat crab.its pretty simple. just understand the workin of a capacitor. it will hold the charge till a potential i fed to it and once it is removed it maintains the same potential.the UPs works on the same principle.it ha a chargin circuit which gets charged when the power is fed to it and feeds an another circuit when the supply is cut out.thats all

 

[Marks256]

I figured a capacitor would hold the power long enough to change the power sources. Thanks!