115/220v Switch?

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  • Dan81
    SNES-powered
    • Oct 2013
    • 1865
    • Romania
    #1

    115/220v Switch?

    Okay,so to keep it short here goes:

    I've got an KME PSU here without any case,no AC plug and no fan. I found out it has a 115/220v switch,and I want to ask you all: can I safely remove it? I'm installing it into a old Delux casing (which originally stored a crappy Sun Pro inside,which went up in nice sparks ) which does not have the space to install the switch and to install it in the small space between the primary heatsink and the transformer is too dangerous for me.

    So,if you have any ideas,I'm here to listen.
    Main rig:
    Gigabyte B75M-D3H
    Core i5-3470 3.60GHz
    Gigabyte Geforce GTX650 1GB GDDR5
    16GB DDR3-1600
    Samsung SH-224AB DVD-RW
    FSP Bluestorm II 500W (recapped)
    120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
    Delux MG760 case
    Tags: None
    • kaboom
      "Oh, Grouchy!"
      • Jan 2011
      • 2507
      • USA
      #2
      Re: 115/220v Switch?

      Desolder the leads, from each side of the switch, from the PCB. Do not replace with a jumper wire.

      You'll then have an ordinary rectifier- just what you need for 240V AC input.
      Last edited by kaboom; 02-21-2016, 05:53 AM.
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        Comment

        • japlytic
          Badcaps Legend
          • Oct 2005
          • 2086
          • Australia
          #3
          Re: 115/220v Switch?

          Does the 115/230V switch have only two wires, and are these two wires shorted when the switch is in the 115V position?
          My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.

            Comment

            • Dan81
              SNES-powered
              • Oct 2013
              • 1865
              • Romania
              #4
              Re: 115/220v Switch?

              japlytic - it has only two wires,both connected between one of the primary 560uF HEC caps. I don't know if 115 equals with the wires being shorted.
              Main rig:
              Gigabyte B75M-D3H
              Core i5-3470 3.60GHz
              Gigabyte Geforce GTX650 1GB GDDR5
              16GB DDR3-1600
              Samsung SH-224AB DVD-RW
              FSP Bluestorm II 500W (recapped)
              120GB ADATA + 2x Seagate Barracuda ES.2 ST31000340NS 1TB
              Delux MG760 case

                Comment

                • mariushm
                  Badcaps Legend
                  • May 2011
                  • 3799
                  #5
                  Re: 115/220v Switch?

                  The switch connects a point between the two large capacitors ( between + of one cap and - of the other) to line input (on the rectifier) and you basically have two capacitors in parallel...

                  When the switch is made, psu is configured in 115v. When switch is off (wires not shorted), the psu is in 230 v mode (and you have the two large capacitors in series and that's how two 200-250v rated capacitors don't blow up when they see 350v+ from the rectifier.



                  Just desolder the wires from the pcb if you want to make the psu 230v only.
                  Attached Files

                    Comment

                    • japlytic
                      Badcaps Legend
                      • Oct 2005
                      • 2086
                      • Australia
                      #6
                      Re: 115/220v Switch?

                      Originally posted by Dan81
                      japlytic - it has only two wires,both connected between one of the primary 560uF HEC caps. I don't know if 115 equals with the wires being shorted.
                      Typically, both wires on the 115/230V switch become shorted when the switch is in the 115V position, but you should confirm this after the large filter capacitors have been safely discharged.
                      My first choice in quality Japanese electrolytics is Nippon Chemi-Con, which has been in business since 1931... the quality of electronics is dependent on the quality of the electrolytics.

                        Comment

                        • budm
                          Badcaps Legend
                          • Feb 2010
                          • 40746
                          • USA
                          #7
                          Re: 115/220v Switch?

                          When switch is closed in 115VAC mode, the circuit become Voltage doubler circuit so the DC primary (about 325VDC) will stay about the same as when it is feeding by the 230VAC.
                          Last edited by budm; 02-23-2016, 09:43 AM.
                          Never stop learning
                          Basic LCD TV and Monitor troubleshooting guides.
                          http://www.badcaps.net/forum/showthr...956#post305956

                          Voltage Regulator (LDO) testing:
                          http://www.badcaps.net/forum/showthr...999#post300999

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                          http://www.badcaps.net/forum/showthr...er+testing+cfl

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                          http://www.badcaps.net/forum/showthread.php?t=24809

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