DESIGN AND CONSTRUCTION OF A PC BASED ELECTRICITY POWER MANAGEMENT SYSTEM
DESIGN AND CONSTRUCTION OF A PC BASED ELECTRICITY POWER MANAGEMENT SYSTEM Department Of Electrical and Computer Engineering, Igbinedion University Okada
ABSTRACT: A PC based electricity power management system has been designed and constructed. The designed PC based electricity power management system were achieved by the use of a timer software which acts as a computer User Interface control and a hardware which acts as a computer interface with the help of a parallel port.
The design was done such that it allows different appliances to be assigned a specific operating time and the use of the OPTO-isolator totally isolates the PC from the hardware, therefore protecting the parallel port from overloading. Firstly the power supply is built, a 240v-15v AC transformer is used, the 15v section of the transformer is solder to the vero board and a bridge rectifier is fixed to the wires on the board, the filtering capacitor (1000uf) is connected to DC output of the rectifier, then a voltage regulator (LM7812) is connected to the output of the rectifier, this steps completes the power supply so the parallel port cable is soldered to the board and the opto-isolator are placed carefully on the board and soldered to the wires of the 25DB cable as shown in the circuit diagram. The current limiting resistors are connected to the isolators, the transistor are connected to the limiting resistor, the transistor collector terminals are connected to the 12v relay and the contacts of the relay are connected to the output port of the device.
The system can be adapted to homes, offices, department of institution etc.
Key words: Bridge rectifier, filter capacitor, limiting resistor, opto- isolator, relay, transformer, user interface, voltage regulator
1. INTRODUCTION
. Power providers constantly deal
ABSTRACT: A PC based electricity power management system has been designed and constructed. The designed PC based electricity power management system were achieved by the use of a timer software which acts as a computer User Interface control and a hardware which acts as a computer interface with the help of a parallel port.
The design was done such that it allows different appliances to be assigned a specific operating time and the use of the OPTO-isolator totally isolates the PC from the hardware, therefore protecting the parallel port from overloading. Firstly the power supply is built, a 240v-15v AC transformer is used, the 15v section of the transformer is solder to the vero board and a bridge rectifier is fixed to the wires on the board, the filtering capacitor (1000uf) is connected to DC output of the rectifier, then a voltage regulator (LM7812) is connected to the output of the rectifier, this steps completes the power supply so the parallel port cable is soldered to the board and the opto-isolator are placed carefully on the board and soldered to the wires of the 25DB cable as shown in the circuit diagram. The current limiting resistors are connected to the isolators, the transistor are connected to the limiting resistor, the transistor collector terminals are connected to the 12v relay and the contacts of the relay are connected to the output port of the device.
The system can be adapted to homes, offices, department of institution etc.
Key words: Bridge rectifier, filter capacitor, limiting resistor, opto- isolator, relay, transformer, user interface, voltage regulator
1. INTRODUCTION
. Power providers constantly deal
References: [1]P.S. Bimbhra ‘Power Electronics’ (Third edition, 1999 November) www.pdf-search engine.com/electrical-machinery-by-dr-p-s-bimbhra-pdf.html (17-02-09) [2] A tutorial on parallel port interfacing.html http://www.logix4u.net & Device switching using a pc’s Parallel port http://www.electrofriend.com (17-02-09) [3] Datasheet http://www.alldatasheet.com (29-06-09)