VACS:Projects:Software:LPS:Display

Overview

Power Supply Control

• Voltage
• Current limitation
• Supply ON/OFF
• Ramp up time
• Calibration voltage
• Calibration current

Global Control

• Fan speed

Interface

The LPS interface is composed of a 2x16 LCD display, a set of 5 buttons and 2 selection wheels.

• Voltage (V)
• Current (A)
• Power (W)
• Max, min, mean current
• Max, min, mean voltage

Display on 2x16 LCD.

123456789ABCDEF

1 +12.00V 250mA 2 -11.85V 125mA

3 +5.034V 2.34A 4 -3.033V 1.12A

+12.00V -11.85V +5.034V -3.033V

1:12V 3:-12V 2:5.0V 4:-3.0V

rotateur 1 -> Voltage +/- rotateur 2 -> Current +/-

1 +12.00V 250mA

 I-Max   490mA

 I-Min   125mA
 P-Max   2.34W

1 +12.00V 250mA

 I-Limit 800mA

Voltage Overview

The voltage overview gives a quick overview of the different output voltages currently selected for the power supplies.

123456789ABCDEFG 1:12V 3:-12V 2:5.0V 4:-3.0V

123456789ABCDEFG 1:12V 3:OFF 2:OFF 4:-3.0V

Left wheel

voltage selection on the power supply having the focus.

Right wheel

change the display mode.

Next button

enter in single power supply display mode.

Supply X

set the focus on the power supply X.

Single Supply Display

This mode displays a single power supply. It allows to control and view all the details of the power supply.

123456789ABCDEFG

+5.503V   250mA SEL STAT CAL

Left wheel

voltage selection.

Right wheel

display selection.

Valid button

select the active display selection.

Supply X

select the active power supply.

123456789ABCDEFG +5.503V   250mA I-Max     490mA

123456789ABCDEFG +5.503V   250mA I-Min      30mA

123456789ABCDEFG +5.503V   250mA I-Mean    230mA

123456789ABCDEFG +5.503V   250mA P-Max      5.4W

Voltage and Maximum Current Control

This mode allows to select the power supply voltage and the maximum output current.

123456789ABCDEFG +12.03V   250mA I-Limit   800mA

123456789ABCDEFG -10.23V   2.45A I-Limit   3.50A

Left wheel

voltage selection

Right wheel

current limitation selection

Next button

exit the "Voltage and Max current control"

Supply X

select the power supply for the voltage and current limitation.

Voltage and Current Calibration

Calibration is necessary to increase the precision of the laboratory power supply. It is controlled by the ATmel microcontroller.

• Voltage calibration is achieved by measuring the power supply voltage with a multimeter and entering the measured value in LPS.
• Current calibration is achieved by measuring the output current while the output is under some load. The load has no importance.

The display is the following:

123456789ABCDEFG

Calibrate 1 +12.03V 250mA

The left button is used to calibrate the voltage and the right button to calibrate the output current.