AC to AC converter triac light dimmer / Zuhailey Mohamed Mustapa and Raja Eddy Sharul Ezwan Raja Mahmood

Mohamed Mustapa, Zuhailey and Raja Mahmood, Raja Eddy Sharul Ezwan (2005) AC to AC converter triac light dimmer / Zuhailey Mohamed Mustapa and Raja Eddy Sharul Ezwan Raja Mahmood. [Student Project] (Unpublished)

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Abstract

The power electronics have proceeded quickly since 1960.Around 1960-1970 thyristors and triacs came to market. Using those components it was quite easy to make small and inexpensive light dimmers which have good efficiency. Electronics controlling also made possible to make them easily controllable from remote location. This type of electronic light dimmers became available after 1970.Nowaday it is used in very many locations like homes, restaurants, conference rooms and in stage lighting.
Solid-state light dimmers work by varying the "duty cycle" (on/off time) of the full AC voltage that is applied to the lights being controlled. For example, if the voltage is applied for only half of each AC cycle, the light bulb will appear to be much less bright than when it get the full AC voltage, because it get less power to heat the filament. Solid- state dimmers use the brightness knob setting to determine at what point in each voltage cycle to switch the light on and off.
Typical light dimmers are built using thyristors and the exact time when the thyristor is triggered relative to the zero crossings of the AC power is used to determine the power level. When the thyristor is triggered it keeps conducting until the current passing though it goes to zero (exactly at the next zero crossing if the load is purely resistive, like light bulb). By changing the phase at which you trigger the triac you change the duty cycle and therefore the brightness of the light.
That is roughly how light dimmer works and we will discuss more detail about the circuit operation in Chapter 2.

Metadata

Item Type: Student Project
Creators:
Creators
Email
Mohamed Mustapa, Zuhailey
2001360645
Raja Mahmood, Raja Eddy Sharul Ezwan
2001127076
Contributors:
Contribution
Name
Email / ID Num.
Thesis advisor
Mohamad Idin, Mohamad Adha
UNSPECIFIED
Subjects: T Technology > TK Electrical engineering. Electronics. Nuclear engineering > Electronics
T Technology > TK Electrical engineering. Electronics. Nuclear engineering > Electronics > Microelectromechanical systems
T Technology > TK Electrical engineering. Electronics. Nuclear engineering > Electronics > Applications of electronics
T Technology > TK Electrical engineering. Electronics. Nuclear engineering > Electronics > Pattern recognition systems
Divisions: Universiti Teknologi MARA, Pulau Pinang > Permatang Pauh Campus > Faculty of Electrical Engineering
Programme: Diploma Of Electrical Engineering
Item ID: 48277
Uncontrolled Keywords: Power Electronics, Light Dimmers, Remote
URI: https://ir.uitm.edu.my/id/eprint/48277

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