The role of a power electronic interface (PEI) is to match the requirements of l

Question

The role of a power electronic interface (PEI) is to match the requirements of load(s) to the source.

For this system, the source is a single AC Voltage Source with the following specifications: Single phase, a magnitude of 120 [Vrms], with a frequency of 60 [Hz].

This system has two (2) loads.

The first load requires an AC (like) voltage waveform and has an equivalent circuit model of a series Resistive - Inductive load (R = 8W and L = 30mH). I recommend using a single phase Voltage Source Inverter. Your PEI needs to be capable of meeting a range of output voltage operating points. The minimum operating point is as follows: 100 [Vp] at 300 [Hz], and a maximum: 230 [Vp] at 110 [Hz]. The total harmonic distortion of the load current must be less than 8% for both settings.

The second load is for the gate drivers and micro-controllers needed for the system. Let us assume this stage requires 8 [Vdc] (± 0.1 [Vdc]) at 5[W]. Let us assume a resistor is a good approximation for this stages load. Be sure to pick the value of the load resistor such that the stage draws the specified output power.

Minimum Requirements for Presentation of Your Design:

Please present a general block diagram of your Final System. The following figure is a suggested block diagram. Feel free to select a different topology as there are many solutions with many correct approaches.

For Load #1: Inverter Stage

Specify the required DC bus voltage

Determine a switching frequency for the design.

Specify the ma for each operating point.

Specify the mf for each operating point.

Specify the switching scheme for the design.

Provide a table similar to that of Table 8-4 in your book for your design for each operating point.

Use a circuit simulation to validate your inverter design for each operating point.

Assume the components for this stage are ideal, so no Power Loss calculations are required.

State the Blocking Voltage and Passing Current for the inverters switching components.

For Load #2: Design a DC power supply

Pick a circuit topology.

Design your circuit for that provides power to this load.

Provide a circuit simulation which validates your design of this stage.

Select parts for this stage that meet the required Blocking Voltage and Passing Current.

Design of any additional PEI Stages.

Pick a topology

Design your PEI for this stage.

Hint: Make sure this stage can supply the power required at it’s output(s).

A circuit simulation validating your design (considering only this stage, you can size a passive resistor that draws the same power at the output of this stage).

Select parts for this stage that meet the required Blocking Voltage and Passing Current.

Explanation / Answer

Load 2:

The minimun voltage has to be choosen as DC voltage for designing of resistance value

i.e.,8-0.1=7.9volts

The power delivered across resistor is 5watts

Therefore power,P=(V^2)/R

#R=(V^2)/P

#R=(7.9*7.9)/5

#R=12.482 ohms

8

8-0.1=7.9

12.8

12.482

For gate driving requirement,we need to design the circuit for worst possible case i.e.,less resistance value

So that it can carry min gate current in all cases of the above voltage values

Therefore current through the resistance when circuit is under conduction is I=7.9/12.482

#I=0.6329amp

Gate circuit can block the voltage max when the circuit is not in conduction i.e.,8.1 volts

8

8-0.1=7.9

12.8

12.482

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