SLAA602A June   2013  – August 2017 AMC1100 , SM72295 , TMS320F2802-Q1 , TMS320F28027 , TMS320F28027-Q1 , TMS320F28027F , TMS320F28027F-Q1 , TPS54202 , TPS54231

 

  1.   800VA Pure Sine Wave Inverter’s Reference Design
    1.     Trademarks
    2. 1 Introduction
    3. 2 Pure Sine Wave Inverter's Design
      1. 2.1 Building Block
        1. 2.1.1 Inverter Mode:
        2. 2.1.2 Main Mode:
      2. 2.2 Switching Waveform Details
      3. 2.3 Schematic of the Design
      4. 2.4 Sections of the Design:
      5. 2.5 Required Steps While Debugging/Working on the Hardware
      6. 2.6 Waveforms and Test Results of 800VA Sine Wave Inverter’s Reference Design:
    4. 3 Comparison of Low-Frequency vs. High-Frequency Inverter
  2.   Revision History

2.6 Waveforms and Test Results of 800VA Sine Wave Inverter’s Reference Design:

1. Inverter Mode Waveform :

waveforms-at-the-gates-of-the-mosfets-in-inverter-mode-slaa602.pngFigure 20. Waveforms at the Gates of the MOSFETs in Inverter Mode (High-Side A MOSFETs and Low-Side B MOSFETs are Conducting).
waveforms-at-the-gates-of-the-mosfets-in-inverter-mode-high-side-b-mosfets-and-a-side-low-mosfets-conducting-slaa602.pngFigure 21. FIG 17: Waveforms at the Gates of the MOSFETs in Inverter Mode (High-Side B MOSFETs and Low-Side A MOSFETs are Conducting).
trilevel-switching-across-the-high-side-a-mosfets-source-hsa-and-high-side-b-mosfets-source-hsb-slaa602.pngFigure 22. Trilevel Switching Across the High-Side A MOSFETS Source (HSA) and High-Side B MOSFETs Source (HSB).

Trilevel Switching Zoomed in:

trilevel-switching-across-hsa-and-hsb-source-waveforms-01-slaa602.pngtrilevel-switching-across-hsa-and-hsb-source-waveforms-02-slaa602.pngtrilevel-switching-across-hsa-and-hsb-source-waveforms-03-slaa602.pngtrilevel-switching-across-hsa-and-hsb-source-waveforms-04-slaa602.pngFigure 23. Trilevel Switching Across the High-Side A MOSFETS Source (HSA) and High-Side B MOSFETs Source (HSB).

Insuring the dead band between complementary waveform to avoid the short-circuit condition:

inverted-waveform-hoa-loa-hob-lob-at-the-gates-of-mosfets-slaa602.pngFigure 24. Inverted Waveform (HOA-LOA and HOB-LOB) at the Gates of MOSFETS.
dead-band-between-complementary-hob-lob-pair-slaa602.pngFigure 25. Dead Band between Complementary HOB and LOB Pair

PWM switching at the gates of the MOSFETs at no load (inverter mode) with 12-V battery input:

maximum-duty-cycle-of-the-pwm-switching-at-no-load-88-percent-slaa602.pngFigure 26. Maximum Duty Cycle of the PWM Switching at No Load (at the Inverter’s Output) is 88 Percent

PWM switching at the gates of the MOSFETs at 400 W (inverter mode) with 12-V battery input:

maximum-duty-cycle-of-the-pwm-switching-at-400w-increased-to-98-percent-slaa602.pngFigure 27. Maximum Duty Cycle of the PWM Switching at 400 W (at the Inverter’s Output) is Increased to 98 Percent to Maintain Voltage regulation at the Inverter’s Output by Sensing the Auxiliary Winding. This Results in Slight clipping of Sinusoidal Waveform at theOutput.
inverters-output-at-no-load-with-12v-battery-input-slaa602.pngFigure 28. Inverter’s Output at No Load With 12-V Battery Input
inverters-output-at-400w-load-with-12v-battery-input-slaa602.pngFigure 29. Inverter’s Output at 400-W Load With 12-V Battery Input

Mains/charging mode waveform:

waveform-during-the-charging-mode-slaa602.pngFigure 30. Waveform During the Charging Mode. The High-Side FET is Switched Off and Both Lower-Side FETs to Ground in the H Bridge are Switched at the Same Time With the Duty Cycle Proportional to the Battery Charge Current