Power Control System

Version 1 by Stephane Carrez
ProjectPower 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


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

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).
Myrra 45000 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.