Java 2 Ada

LPS Display

Version 1 by Stephane Carrez

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

Main View

The main view has several display modes that are selected by the right wheel.

Voltage Overview

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

Left wheel: voltage selection on the power supply having the focus.
Right wheel: change the display mode.
Validate button: enter in single power supply display mode.
Supply X: set the focus on the power supply X.

Voltage and Current Display

The voltage and current or the voltage and output power can be displayed for two power supplies at the same time.

Left wheel: voltage selection on the power supply having the focus.
Right wheel: change the display mode.
Validate button: enter in single power supply display mode.
Supply X: set the focus on the power supply X.

Fan Control

Left wheel: fan rpm speed.
Right wheel: change the display mode.
Validate button: ?
Supply X: switch to voltage overview and set the focus on the power supply X.

Temperature Control

Single Supply Display

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

Left wheel: voltage selection.
Right wheel: display selection.
Validate button: select the active display selection.
Supply X: select the active power supply.

Voltage and Maximum Current Control

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

Left wheel: voltage selection
Right wheel: current limitation selection
Validate 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:

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