Inverter

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(Components)
(Components)
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The system consists of
 
The system consists of
* an [[Inverter#H-bridge power board|H-bridge power board]]
+
* an [[Inverter#H-bridge power board|H-bridge power board]] together with a [[Inverter#Power LC lowpass board|power LC lowpass board]]
* a [[Inverter#transformer board|Transformer board]]
+
* a [[Inverter#Transformer board|transformer board]]
 
* an [[Inverter#FPGA_board|FPGA prototyping board]]
 
* an [[Inverter#FPGA_board|FPGA prototyping board]]
* an [[Inverter#LC lowpass board|LC lowpass board]]
+
* an [[Inverter#Buttons and LEDs I/O board|buttons and LEDs I/O board]] for the control
* an [[Inverter#Buttons and LEDs I/O board|Buttons and LEDs I/O board]] for the control
+
* a [[Inverter#Logic-level LC lowpass board|logic-level LC lowpass board]]
  
 
=== H-bridge power board ===
 
=== H-bridge power board ===
Line 46: Line 46:
 
The 12 V power supply from this board is brought to the ribbon cable connector and is used to power the [[Inverter#FPGA_board|FPGA board]] as well.
 
The 12 V power supply from this board is brought to the ribbon cable connector and is used to power the [[Inverter#FPGA_board|FPGA board]] as well.
  
=== LC lowpass board ===
+
=== Power LC lowpass board ===
 
The LC lowpass board is used in conjunction with the H-bridge power board.
 
The LC lowpass board is used in conjunction with the H-bridge power board.
 
It smooths the PWM signal into a sine wave.
 
It smooths the PWM signal into a sine wave.
  
The default LC cutoff frequency is something like 20 kHz as this board is also used for an audio amplifier.
+
The default LC cutoff frequency is something like 20 kHz, as this board is also used for an audio amplifier.
  
 
=== Transformer board ===
 
=== Transformer board ===
 
The transformer board allows to reference the differential output to any common voltage.
 
The transformer board allows to reference the differential output to any common voltage.
  
The board at our disposal transforms 7.5 V tp 115 V.
+
The board at our disposal transforms 7.5 V to 115 V.
 
As it provides a high voltage, it should be handled with great care.
 
As it provides a high voltage, it should be handled with great care.
  
Line 63: Line 63:
 
=== Buttons and LEDs I/O board ===
 
=== Buttons and LEDs I/O board ===
  
The [http://wiki.hevs.ch/uit/index.php5/Hardware/Parallelport/heb_lcd Buttons and LEDs board] is used in conjunction with the FPGA board.
+
The [http://wiki.hevs.ch/uit/index.php5/Hardware/Parallelport/heb_lcd buttons and LEDs board] is used in conjunction with the FPGA board.
  
 
It has 4 buttons and 8 LEDs.
 
It has 4 buttons and 8 LEDs.
 
It can hold an optional LCD display.
 
It can hold an optional LCD display.
 +
 +
=== Logic-level LC lowpass board ===
 +
The logic-level LC lowpass board is used to verify the content of the PWM signals in the two H-bridge branches.
 +
It smooths the two FPGA output PWM signals into the components of a differential sine wave.
 +
 +
On this board too, the default LC cutoff frequency is something like 20 kHz.
  
 
== Getting started ==
 
== Getting started ==

Revision as of 11:21, 29 October 2015

Contents

The Filière Energie et Techniques environnementales (FET) has the digital systems course and labs in the 3rd (autumn) semester. The semester counts 15 weeks and ends with a little project. The aim of the inverter project is to generate a 50 Hz AC power supply from a DC input.

Inverter 110 V generator setup.JPG

Specification

Function

The 12 V power supply is chopped by the power switches of an H-bridge in order to generate a sine wave. The resulting voltage is filtered by a passive LC filter to provide a smooth sine wave. The digital system generates the PWM controls of the 4 power switches.

Inverter system.svg

An I/O board with 4 switches and 8 LEDs allows to control the operating mode and to display information about the system's state.

Inverter boards.JPG

PWM modes

Different PWM modes are to be investigated:

  • a two-level mode switching between 0 V and 12 V
  • three-level modes switching between -6 V, 0 V and 6 V

Components

The system consists of

H-bridge power board

The H-bridge board is powered with 12 V. The 4 MOS transistors are driven by 2 IR2110 driver circuits. The PWM controls are brought to the board via a ribbon cable.

This board is also used for an audio amplifier student project.

The 12 V power supply from this board is brought to the ribbon cable connector and is used to power the FPGA board as well.

Power LC lowpass board

The LC lowpass board is used in conjunction with the H-bridge power board. It smooths the PWM signal into a sine wave.

The default LC cutoff frequency is something like 20 kHz, as this board is also used for an audio amplifier.

Transformer board

The transformer board allows to reference the differential output to any common voltage.

The board at our disposal transforms 7.5 V to 115 V. As it provides a high voltage, it should be handled with great care.

FPGA board

The main board is the school's FPGA-EBS lab development board. It hosts a Xilinx Spartan xc3s500e FPGA and features many different interfaces.

Buttons and LEDs I/O board

The buttons and LEDs board is used in conjunction with the FPGA board.

It has 4 buttons and 8 LEDs. It can hold an optional LCD display.

Logic-level LC lowpass board

The logic-level LC lowpass board is used to verify the content of the PWM signals in the two H-bridge branches. It smooths the two FPGA output PWM signals into the components of a differential sine wave.

On this board too, the default LC cutoff frequency is something like 20 kHz.

Getting started

In order to start the projects you should do the following:

  • Read carefully the specifications above
  • Draw the architecture of the circuit in the form of a block diagram
  • Consult the guides for the first steps into the design software

Additional Information

Additional informations for teachers.

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