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Inverters
Inverters
Inverters
Inverters
Inverters
Inverters
Inverters
Inverters
Inverters
Inverters
Inverters
Inverters
Inverters
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Inverters

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  • 1. InvertersInverters take dc from a battery (etc) and convert it electronically to ac power. Revision 01 1
  • 2. Revision 01 2
  • 3. Block diagram of and inverter AC OutDC In Switches Transformer Rectifier Filter DC Out DC to AC Output is sampled to adjust switching for voltage regulation Revision 01 3
  • 4. Inverter OPERATION• Inverters are classified by their ac output waveform. – Square wave – Modified sine wave – True sine wave Revision 01 4
  • 5. Inverter operationSine Wave Square Wave Modified Square Wave Revision 01 5
  • 6. Inverter operation• Most smaller inverters are either square wave (cheap) or modified square wave. Revision 01 6
  • 7. Inverter operationBy closing and opening the switch rapidly, a square wave supply tothe transformer is achieved. This used to be done mechanically witha “vibrator”. (Yeah! I know…) Revision 01 7
  • 8. Inverter operationThe switches close in turn, producing a pseudo-AC in the primary.Not that rectification is centre-tapped, full wave, with an L filter. Revision 01 8
  • 9. Inverter operationHere the rectifier is a full wave, bridge, with L filter. Revision 01 9
  • 10. Inverter operationA single winding is used here on the primary, with the switchesclosing is sequence to provide AC to the primary. Revision 01 10
  • 11. Vibrator Vibrator Here is what one looks like. Inside are vibrating mechanical contact points that oscillate and generate a low voltage AC signal from the DC voltage applied to it from the battery. The AC signal then feeds a transformer where the voltage is increased. AC Out Revision 01 11
  • 12. Revision 01 12
  • 13. Square waves• Cheap• Very poor regulation• Produce large amounts of RFI• Very rough AC• Large amounts of harmonics• Often used for small appliances eg; fluro lightsVery few but the very cheapest inverters any more are square wave. A square wave inverter will run simple things like tools with universal motors with no problem - but not much else. These are seldom seen any more except in small, very cheap or very old inverters. Revision 01 13

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