文件列表:

数字电源\lcdtest.c (790, 2005-06-16)
数字电源\Makefile (4027, 2005-06-17)
数字电源\analog.c (5068, 2005-06-26)
数字电源\analog.h (653, 2005-06-08)
数字电源\avr_compat.h (1108, 2005-05-26)
数字电源\dac.c (881, 2005-06-05)
数字电源\dac.h (375, 2005-06-05)
数字电源\ddcp.c (5453, 2005-06-15)
数字电源\ddcp.hex (15817, 2005-06-26)
数字电源\ddcp_pre.hex (15817, 2005-06-26)
数字电源\hardware_settings.h (1425, 2005-06-11)
数字电源\kbd.c (1829, 2005-06-07)
数字电源\kbd.h (470, 2005-06-05)
数字电源\lcd.c (6586, 2005-06-05)
数字电源\lcd.h (4922, 2005-06-05)
数字电源\lcd_hw.h (1974, 2005-06-05)
数字电源\数字电源.pdf (658781, 2005-09-27)
数字电源 (0, 2005-09-27)

Digital DC Power ================ Compile the software and program the microcontroller: 1) edit and adapt the file hardware_settings.h 2) load and compile: make wrfuse4mhz make make load The make wrfuse4mhz needs to be done only once unless you change the Atmega8 chip. make/make load need to be repeated everytime you change something in the software (e.g update of hardware_settings.h). The poweresupply must be powered up during programming but nothing should be connected to the output. Make also sure that you do not accidently press any button during the programming (loading the software into the uC). --------------------------------------------------------------- Overview ======== This is the software and hardware description for the tuxgraphics.org electronic power supply. A microncontroller controlled DC power supply. All of the control logic is implemented in software. This saves a lot of parts compared to conventional lab-power supplies. This means it is cheaper, easier to build and offers more functionallity. Note however that this means also that the short circuit protection is implemented in software. So be careful when you change something in the software. If the microcontroller is not running properly due to a software fault then there might not be any short circuit protection. The software is prepared for 2 versions: - 0-24V 0-2A - 0-30V 0-2.5A It is possible to build a different version without major re-design. Check the article details for hardware limits and to extend them. The hardware has as of this release features which are not yet supported by the software: - store settings to survive a power off - i2c driver interface to linux PC The plan is that both features will be added in future versions of the software. It will be software only changes. --------------------------------------------------------------- How the software works ====================== I have added a lot more comments to the software than usual. It should be possible even for somebody with little experience in C programming to understand how this software works. The circuit uses as internal units ADC steps. All external values (Volt, Ampere) are converted to steps of the analog to digital converter (ADC). When you change the voltage then this is first converted to ADC steps and then it will be further processed. ddcp.c -- this is the main program. All initialisation starts here. It contains a infinite while loop which will execute the slow tasks one by one: + Convert ADC results to display values + Update the LCD + Check push buttons analog.c -- the analog to digital converter and the main control loop for the power supply. Everything is interrupt based here as it needs to be fast. Voltage control, current limitation and short circuit protection are all implemented here. dac.c -- the digital to analog converter. Initalized from ddcp.c but used exclusivly from analog.c kbd.c -- the keyboard driver lcd.c -- the LCD driver. This is a special version which will not need the rw pin of the display. It uses instead an internal timer which should be long enough for the display to finish its task. The RW pin which is normally used to poll the display to see if it is ready is not needed. ------------------------------------------------------------------- Copyright: GPL Author: Guido Socher Homepage: http://www.tuxgraphics.org/electronics/ ------------------------------------------------------------------- Change history: digitaldcpower-0.2.2 -- first public version 2005-06-16 limitations: no i2c, no permanent storage of settings digitaldcpower-0.2.3 -- 2005-06-25 update of circuit diagram -------------------------------------------------------------------

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