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INVERTERS: The Investigation to the Presenter: Dr Gawie van der Merwe static as well as mobile applications sinewave inverter range for the use in optimal.

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Presentation on theme: "INVERTERS: The Investigation to the Presenter: Dr Gawie van der Merwe static as well as mobile applications sinewave inverter range for the use in optimal."— Presentation transcript:

1 INVERTERS: The Investigation to the Presenter: Dr Gawie van der Merwe static as well as mobile applications sinewave inverter range for the use in optimal topology to the designing of a

2 Copyright: Dr Gawie van der Merwe www.planmypower.co.za Background Investigation towards: –Efficiency –Cost –Reliability –Manufacture (Complexity/Simplicity) Investigations done in order to search for the optimal topology. Various Topologies exist. PV and Mobile Inverters with a sinewave output is the optimal requirement.

3 Copyright: Dr Gawie van der Merwe www.planmypower.co.za Sinewave Inverter Topologies CVT (Constant Voltage Transformer) 50Hz Transformer –Push Pull Primary- –Full Bridge switching in Primary with series line Inductor High Frequency Isolation Transformer and Secondary H-Bridge Control Series or Parallel Transformer switching

4 Copyright: Dr Gawie van der Merwe www.planmypower.co.za A) Constant Voltage Transformer (Ferro Resonant Transformer)

5 Copyright: Dr Gawie van der Merwe www.planmypower.co.za B) 50Hz - Transformer Topology Various 50Hz transformer topologies exist 3Full Bridge Inductor in primary 1Push-pull - Inductor in primary 2Push-pull - Inductor in secondary

6 Copyright: Dr Gawie van der Merwe www.planmypower.co.za

7 Topology B1 1Push-pull - Inductor in primary

8 Copyright: Dr Gawie van der Merwe www.planmypower.co.za Topology B1 Disadvantages –Voltage overshoot over devices - leads to voltage rating increase - Reduction in efficiency –No-, or limited control over free running inductor current –Skewing of transformer often occur. Advantages –Simple manufacture & design –Mosfet drive circuit referred to ground 1Push-pull - Inductor in primary

9 Copyright: Dr Gawie van der Merwe www.planmypower.co.za Primary side Push-pull, series inductor in secondary Topology B2 2Push-pull - Inductor in secondary

10 Copyright: Dr Gawie van der Merwe www.planmypower.co.za Topology B2 Advantages –Simple manufacture & design –Mosfet drive circuit referred to ground Disadvantages –Voltage overshoot over devices - leads to voltage rating increase - Reduction in efficiency –No-, or limited control over free running inductor current –Skewing of transformer often occur. 2Push-pull - Inductor in secondary

11 Copyright: Dr Gawie van der Merwe www.planmypower.co.za Most popular used topology Topology B3 3Full Bridge Inductor in primary

12 Copyright: Dr Gawie van der Merwe www.planmypower.co.za Advantages –Complete control over primary side inductor current –Uni-as well as bi-polar pwm control strategy possible –Simple manufacturing Topology B3 Disadvantages –System design is more complex –Inverter efficiency is load dependent 3Full Bridge Inductor in primary

13 Copyright: Dr Gawie van der Merwe www.planmypower.co.za C) High Frequency Isolation

14 Copyright: Dr Gawie van der Merwe www.planmypower.co.za High frequency isolation reduce physical size –Direct output control leads to better output waveform control and reduced distortion C) High Frequency Isolation Transformer with full H-bridge Control on Secondary

15 Copyright: Dr Gawie van der Merwe www.planmypower.co.za

16 Advantages –Units generally more mobile –Possible to limit battery current drawn to a smooth DC –Good efficiency with a non linear load High Frequency Isolation Transformer Disadvantages –Design is complex –Manufacture is complex –High cost

17 Copyright: Dr Gawie van der Merwe www.planmypower.co.za A wide range of topologies exist D) Transformer - series and/or parallel switching A combination of various Transformer switching topologies –Transformer secondary is in series –Separate output voltage & frequency for each transformer

18 Copyright: Dr Gawie van der Merwe www.planmypower.co.za Transformer-series and/or parallel switching

19 Copyright: Dr Gawie van der Merwe www.planmypower.co.za

20 Advantages –High running to overload ratio is –Very popular design –Advantages for motor startup –High efficiency Transformer -series and/or parallel switching Disadvantages –Control complex –Manufacturing is complex –Inverter is big and bulky

21 Copyright: Dr Gawie van der Merwe www.planmypower.co.za Summary Different topologies have advantages for different applications Both topology A, B1&B2, (50Hz topology) are outdated High frequency option, has mobility & weight advantage –Output distortion under all conditions low Matrix transformer topology –Physical dimensions restrains mobility –Ideal for short period overload power peak/Mass ratio is good

22 Copyright: Dr Gawie van der Merwe www.planmypower.co.za Estimated Inverter Manufacturing Costs (Same Input Power Stage) Input power stage same for comparing Calculation done on continues rating without forced air cooling Cost calculated on discreet units

23 Copyright: Dr Gawie van der Merwe www.planmypower.co.za Non linear load as a % of total power consumption Non linear loads - high percentage on power application below 1Kva typical loads, computer, fluorescent lights, video Higher power application, more resistive, i.e. Microwave, Hairdryer etc. < 1Kva most sensitive to PV applications

24 Copyright: Dr Gawie van der Merwe www.planmypower.co.za

25 Topology Suggestions for Power Levels Power Rating High Frequency Full Bridge 50Hz Matrix Config. 100-600W Mobile (most cost efficient) 50% Advantage on perm installation 60% Too expensive 10% 400W-1500W Mobile General 70% PV-Permanent 100% PV-Permanent 40% 1000W-2,5Kw PV-Permanent 70% PV & Mobile Stackable units in parallel 70% PV Permanent Best choice 80% 2Kw-5Kw Stackable parallel combination 100% Stackable Units 80% Mobile 30% (Percentage indicates topology choice for the application)


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