The ULK-INV4 is a flexible 4-phase leg inverter system developed for the Power Electronics teaching environment. It provides both undergraduate and postgraduate students with a complete digitally controlled (up to) 2kW inverter platform.
The system has at its core a standalone inverter controller that interfaces to a 2kW rated four-phase leg IGBT based power stage.
The ULK-INV4 controller is powered from a universal single-phase input (85 - 265VAC), which is separate to the power stage connections.
External interfaces provide expansion capability for user programmed applications.
The ULK-INV4 is controlled via an isolated USB Serial Port interface. The PC user interface can be acccessed via the dedicated ULK-INV4 graphical interface software, or alternatively through a standard terminal serial program.
|Configuration||4 phase leg, TO-247 IGBT’s|
|Input Voltage||0 - 265VAC single-phase; 0 - 400VDC|
|DC Bus Voltage Range||0 - 400V maximum|
|Input Current||15A (maximum)|
|Switching Frequency||500Hz - 10kHz (maximum)|
|Power||2kW, with either single or 3/4-Phase operation|
|Bus Capacitance:||DC Bus 1 (1320uF), DC Bus 2 (2970uF)|
|Ambient Temperature||-5°C to 55°C|
|Configuration||Independent isolated Control logic power|
|Input Voltage||85-265V /50-60 Hz AC input.|
|Start/Stop||Buttons available on Top Panel|
|Communications||Isolated USB serial interface|
|Isolated Clocked Serial Interface Port (user programmable)|
|Position Encoder||Isolated Digital Quadrature Encoder Input (user programmable)|
|User Programmable||Yes - Isolated JTAG Interface (requires JTAG Programmer)|
|MCU Processor||Texas Instruments TMS320F2810 (CPT-DA2810)|
|Digital Output Interfaces|
|Relays||Two off Changeover Contacts (user programmable)|
|MOSFET||One off Digital Output (user programmable)|
|Currents (internal)||DC Input Current (when operated from a DC input)|
|Switched phase leg A, B and C.|
|Voltages (internal)||DC Bus 1 Voltage|
|DC Bus 2 Voltage|
|Voltages (external)||DC Voltage|
|2 off AC Voltages (common neutral).|
|Control Signal Isolation||Yes|
|Power Stage Isolation||Yes - from all control interfaces|
|Power Stage Connectors||Safety Shrouded 4mm Socket|
|Protection||DC Bus Over Voltage|
|Fuse Protection - Power Stage|
|Fuse Protection - Controller|
|Dimensions (WxLxH) mm||390 x 495 x 275|
To simplify the use of the inverter within the teaching laboratory Creative Power has developed a GUI that allows the focus to remain on the teaching of power electronic concepts, rather than the configuration of the inverter. When an operating mode is selected the Inverter Status box displays the appropriate phase legs to be used for the output.
The graphical user interface software is available as standard with the ULK-INV4. It provides a consolidated display showing the Inverter Status, selected operating mode and the value of the PWM parameters relevant to that mode. The user can modify these settings, as appropriate, through the graphical interface.
The following pictures provides an example of the mode selection process within the ULK-INV4 graphical interface. In this instance the mode of operation to be selected is Three Phase PWM, with Sinusoidal PWM and Phase Control.
In addition, there is a detailed Analog Measurements mode which displays the value of all available analog quantities. Note that this display should be used in conjunction with appropriate external measurement equipment, such as oscilloscopes and multimeters.
GUI Software compatible with Windows 7 and above