| Project | Power Control System |
| Date | 2000 - today |
| Goals | Control the electrical power of the computers and its peripherials |
| Dependencies | http://www.vacs.fr/wiki/index.php/VACS:Projects:Software:Gnu68hc1x http://www.vacs.fr/wiki/index.php/VACS:Projects:Software:Gel |
Overview
This is a new project I'm starting. I want to control the electrical power of all computers and peripherials I'm using. It will have 3x 68HC11 organized as follows:
- A first 68HC11 directly manages 8-triacs to control the mains of the local computers and peripherals (PC, screen, printer, scanner, modem, ...). It is directly connected to the 220V mains. It communicates with main 68HC11 using the serial line (opto-isolated). The program will be in the 512-byte EEProm.
- A second 68HC11 controls the remote pheripherals. It is intended to control the mains of a Sun3, a remote PC server, a noisy hard disk, ... (well, few noisy boxes). It communicates with the main 68HC11 using the SPI.
- The third 68HC11 controls everything and gives orders to the above. It is connected to the local PC using the serial line. For the user interface, I'm thinking about the Touch LCD Panel.
In addition to these, 4 separate 9V supplies will be available. Two of them will be used for power supply of my Axiom Manufacturing boards.
Triacs Board
| Status | |
|---|---|
| Schema finished | |
| Validated the schema | |
| Validated the board layout | |
| Board manufactured | |
| Board finished | |
| Board tested | |
The Triacs Power Control module drives 8-triacs using a pulse width modulation system and a zero crossing detection module. The system is driven by a 68HC11 in bootstrap mode and connected to boot from its internal eeprom.
This board was first tested using an Ada95 program that was uploaded using the bootstrap mode. The program was less than 250 bytes. GEL Ada95 Example.
Triacs Power Control Module
Documentation on the chips used by PC Power Triacs board.
| Documentation (1) | |
|---|---|
| M68HC11E | 68HC11E1 |
| L7800 | Positive voltage regulator (7805, 7812, 7815, ...). |
| BC237 | NPN Epitaxial Silicon Transistor |
| BT137.pdf | Triacs (I've used a BT137-600). |
 | Transformer (Myrra). |
| TL072 | Low Noise Dual J-FET Operational Amplifiers |
| MC34064 | Undervoltage Sensing Circuit |
| LM35 | Precision Centigrade Temperature Sensors |
| CNY17 | TRIOS (R) Phototransistor Optocoupler |
| MTC6 | Dual Phototransistor Optocoupler |
| ULN2804 | Eight darlington arrays |
(1) Documentation publicly available on various constructor web sites and copied here for archiving.