2.2.2. Control by Phase angle:
Definition : 2.2.2.1. Controlled law
The switch is controlled on half period (
From 0 to à
=>
From t2 to T/2 (
=>
From T/2 to t2+T/2 (
=>
From t2+T/2 to T (
=>
In this case , Voltage and Current are not sinusoidal |  |
2.2.2.2. Calculation
DC Voltage:
RMS Voltage :
|  |
The RMS value of the current is:
The mean power in R is:
Method : 2.2.2.3. Use of the dimmer
This type of Dimmer is used mainly to control lighting or induction motor starter for small power.
Note : 2.2.2.4. Design
The switch is :
Thyristors or Triac.
This technology is also used to control the starting of Induction motor (Altisart)
