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Voltage Sag Ride through Device for Personal Computer
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Voltage sags have emerged as one of the most serious power quality problem. Voltage sag disturbances, which sometimes last less than a fraction of second, can cause sensitive equipment such as personal computers (PCs) to shut down and interrupt PC controlled systems and processes for considerable periods of time, which leads to loss of production and high costs. In order to overcome this problems, an electronic device the enhance the ride through capability of PCs during voltage sag is invited. The proposed device can be connected to the power of supply unit of PC to add a new operational state to the PC???s power supply, in which PC supplied for one second by a capacitor bank in the event of voltage sags. In this case, the capacitor bank acts as an energy storage device. The proposed ride through device consists of sag detection circuit, control circuit, switching circuit and capacitor bank. The device is simple, easy to use and can be built from cheap, commercially available components. Some of the salient features of the proposed device are that it does not require additional uninterruptable power supply for its operation and it does not draw high levels of inrush currents from the mains. Furthermore, the proposed device can be adapted to other voltage sensitive devices such as lamps and contactors.

Industrial Design
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Aetas Intellectual Property Solutions Sdn Bhd
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Faculty of Engineering, Universiti Kebangsaan Malaysia,
43600 Bangi

Full Name [1]
Prof. Dr. Azah Mohamed
Email [1]