Inverters

VE2.4.3.3
Inverters
Inverters

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This experiment/set up contains dangerous goods.
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Description

The experiments are carried out on training panels in panel frames.

Objectives

  • Protective measures and electrical safety
  • Circuit assembly and wiring according to circuit diagrams
  • Use of commercial measuring instruments: hand-held multimeters and oscilloscopes

Self commutated inverters are used in frequency converters, uninterruptible power supplies, mains coupling equipment for photovoltaic systems etc. This equipment set makes it possible to construct a single-phase AC inverter to create an AC voltage of variable frequency and amplitude.

The equipment is equally suitable for student experiments in the laboratory with mains voltage (220 V direct current) and - with a mobile trainer - for teacher demonstrations in the classroom.  The experiments are carried out according to the manual.

The target group is made up of commercial apprentices and students of electrical machine construction. The course offers experiments at an intermediate level and also allows for the necessary insight into machine behaviour for scientific interpretation at undergraduate level.

Topics

Single ended forward converters

  • Control of average values for voltage and current using PWM
  • Measurement of voltage and current over time when VI = 30 V
  • Measurement of voltage and current over time when VI = 115 V
  • Measurement of efficiency and voltage stability

Asymmetric half-bridge forward converter

  • Control of average values for voltage and current using PWM
  • Time characteristic when v = 0.75
  • Time characteristic when v = 0.50
  • Time characteristic with duty cycle switch-over
  • Time characteristic for sinusoidal inverter
  • Inverter with VI = 115V
  • Inverter with VI = 115V, f = 5 kHz

Components of equipment sets

1 73402  8  Reference variable generator LD
1 73509  8  Load power electronics LD
1 73518 Fuse threefold super-fast LD
1 726962  4  Function generator 200 kHz LD
1 73419 Gain and offset adjust LD
1 735065  8  Rectifier B6, 3 x 400 V/10 A LD
1 735095  8  Capacitors 2x 1000 µF, 385 V LD
1 735190  8  Phase control noise filter 3 x 4.5 A LD
1 735341  8  Control unit PWM/PFM LD
4 735346  8  IGBT 1000 V/10 A LD
Manuals:
1 565401  4  LIT: Switched-Mode Power Supplies, Power-Factor Correction & Inverters, (in German) LD
1 565402  4  LIT: Switched-Mode Power Supplies, Power-Factor Correction & Inverters,  (in English) LD
1 727100 Power Analyser CASSY LD
1 524222 CASSY Lab 2 for Drives and Power Systems LD
1 531282  8  Multimeter Metrahit Pro LD
Measuring instruments, with digital measurement CASSY:
1 727110  8  Power Analyser CASSY Plus LD
1 575302 Oscilloscope 30 MHz, digital, PT1265 LD
2 575231  8  Probe 100 MHz, 1:1 / 10:1 LD
1 500990 Adapter sockets, set of 2 LD
2 50102  8  BNC cable, 1 m LD
1 531282  8  Multimeter Metrahit Pro LD
Power supply:
1 72686  4  DC-Power Supply ± 15 V/3 A LD
1 72680  4  Transformer, 45/90, 3 N LD
1 72609  4  Panel frame T130, two-level LD
2 50059  8  Safety bridging plugs, black, set of 10 LD
1 500851  4  Safety connecting leads, 32 A, set of 32 LD
1 500852  8  Safety connecting leads, 32 A, yellow/green, set of 10 LD
additionally required:
PC with Windows 7/8/10
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