Inverters related question

Discussion in 'General Electronics Chat' started by s2pk, Dec 17, 2011.

  1. s2pk

    Thread Starter Member

    Jul 10, 2010
    my question is why we connect positive of battery to center loop of transformer or in other words I can ask why we invert negative of battery?
  2. Audioguru

    New Member

    Dec 20, 2007
    You did not show the schematic of the inverter circuit you are asking about so your questions are meaningless.

    I have never seen "invert negative of battery" so please show us what it is.
  3. Adjuster

    Well-Known Member

    Dec 26, 2010
    Possibly this relates to the fact that many inverters are built using N-channel FETs (or previously NPN transistors). At present, many of the most suitable switching devices are of these kinds, which are conveniently used with loads returned to the positive supply.

    Other arrangements are possible, e.g. with PMOS transistors, but generally the performance of P-channel is devices is not as good.
  4. crutschow


    Mar 14, 2008
    There is no inversion of the battery voltage, whatever that means. As Adjuster noted, typically NPN or N-MOSFET transistors are used to alternately switch the two sides of the windings to ground which generates the switching waveform in the transformer. These devices work on a positive voltage, so that is the polarity applied to the transformer center-tap. The applied transistor voltage thus has the same polarity as the center-tap. When the transistor turns on there is a positive voltage applied between the center-tap and ground, which is converted by the transformer action and appears on the output winding(s). There is no voltage inversion in the primary.