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.

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

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

Mode Selection

123456789ABCDEF
1 +5.503V 250mA
SEL STAT CAL

Voltage and Maximum Current Control

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

left button

voltage selection

right button

current limitation selection

Next button

exit the "Voltage and Max current control"

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:

123456789ABCDEF
Calibrate 1
+12.03V   250mA

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