Be careful sufficiently so as not to be
shockedbecause this circuit
handles the commercial power(AC100V or
more).
I introduce the electric power
controller which used the bidirectional triode thyristor(TRIAC). This
circuit can control the electric power with the one variable
resistor.
This circuit is used for the dimmer which
changes the light of the bulb. This circuit changes the quantity of the
electric current which flows through the load with the bidirectional
triode thyristor and controls the electric power. It is only the
alternating voltage that can be controlled with this circuit and it isn't
possible to do the control of the DC voltage.
Because it controls the passing time of the alternating current by
the bidirectional triode thyristor, the electric current which flows
through the load is not the clean sine wave form. Because it is, there is
limitation in the equipment which can be controlled with this
circuit.
The bidirectional triode thyristor is
generally called by the trade name TRIAC.
| The equipment which can be
controlled |
 |
The equipment which works by the
resistance.
Such as the the tungsten-filament
lamp, the soldering iron and so on. |
|
The equipment which is using the AC
series motor(with the brush).
Such as the
drill, the electric fan, the cleaner and so on. |
The equipment which can not do the
control |
|
The fluorescence light. |
|
The synchronous motor(using the
capacitor) |
|
As for the synchronous motor, the number of
rotations is decided by the frequency of the alternating current.
So, basically, it isn't possible to control with the circuit this
time. However, the torque(power to turn) of the motor declines when
the electric current which flows through the synchronous motor
decreases. With it, the revolution can be slowed down. In this case,
with the load which is applied to the axis of the motor, the number
of rotations isn't
constant. | The
electric power which can be controlled is decided by the permission value
of the electric current which can pour into the TRIAC. I used the TRIAC
which can apply the 12-A electric current to the circuit this time. In the
calculation, in case of AC 100V, a maximum of 1200 W can be controlled but
in the actual use, about 700 W or 800 W are safe.
When using the circuit at
more than AC 100V( e.g. AC 200V), the permission voltage of the capacitor
must be considered in addition to the rated voltage of the
TRIAC.
|
