4
3.1
Explanation phase angle control Ph
The phase angle control is an electrotechnical method to regulate the electrical power of loads with
single phase current or three phase current. A typical use of this technology is dimming of light bulbs
and various inductive and ohmic components. The effective value of the voltage as well as the
electrical power consumption of the load can be changed by altering the switch-on moment. For many
electrical engines with suitable construction (for example universal motors, asynchronous motors, fan
motors or pump motors) a phase angle control can be used to control speed and torque. Due to the
controllability of the positive and negative half-wave it is possible to adjust exactly the load voltage and
to implement precise control applications. The variation of the phase angle
α
also allows the control of
transformers for softstart- and control applications.
U
LAST
t
α
Thermokon Sensortechnik GmbH - Thyristor controller TS1 3Ph, TS1 SP 3Ph
P
U
I
U V
V
st
=
×
×
æ
è
ç
ö
ø
÷
max
max
[ ]
10
2
U
U
U V
V
st
=
×
max
[ ]
10
I
I
U V
V
st
=
×
max
[ ]
10
U
max
I
max
P
max
Voltage U, current I, active power P with linearized characteristic
Phase angle control
U, I, P
(normalized to maximum values)
Voltage U, current I (normalized)
Active power P (normalized)