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PDF AN1003 Data sheet ( Hoja de datos )

Número de pieza AN1003
Descripción Thyristors
Fabricantes Littelfuse 
Logotipo Littelfuse Logotipo



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Teccor® brand Thyristors
AN1003
Phase Control Using Thyristors
Introduction
Due to high-volume production techniques, Thyristors
are now priced so that almost any electrical product can
benefit from electronic control. A look at the fundamentals
of SCR and Triac phase controls shows how this is
possible.
Output Power Characteristics
Phase control is the most common form of Thyristor power
control. The Thyristor is held in the off condition -- that is, all
current flow in the circuit is blocked by the Thyristor except
a minute leakage current. Then the Thyristor is triggered
into an “on” condition by the control circuitry.
For full-wave AC control, a single Triac or two SCRs
connected in inverse parallel may be used. One of two
methods may be used for full-wave DC control -- a bridge
rectifier formed by two SCRs or an SCR placed in series
with a diode bridge as shown in Figure AN1003.1.
Line
Control
Circuit
Load
Two SCR AC Control
Line
Control
Circuit
Load
Triac AC Control
Line
Line
Control
Circuit
Control
Circuit
Load
Load
One SCR DC Control
Two SCR DC Control
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of Phase Control
Figure AN1003.2 illustrates voltage waveform and shows
common terms used to describe Thyristor operation. Delay
angle is the time during which the Thyristor blocks the line
voltage. The conduction angle is the time during which the
Thyristor is on.
It is important to note that the circuit current is determined
by the load and power source. For simplification, assume
the load is resistive; that is, both the voltage and current
waveforms are identical.
Full-wave Rectified Operation
Voltage Applied to Load
Delay (Triggering) Angle
Conduction Angle
Figure AN1003.2
Sine Wave Showing Principles of Phase
Control
Different loads respond to different characteristics of
the AC waveform. For example, some are sensitive to
average voltage, some to RMS voltage, and others to peak
voltage. Various voltage characteristics are plotted against
conduction angle for half- and full-wave phase control
circuits in Figure AN1003.3 and Figure AN1003.4.
HALF WAVE

1.8
1.6
Peak Voltage
1.4
1.2
1.0
RMS
0.8
Power
0.6
0.4
0.2
0
0
AVG
20 40 60
80 100 120 140 160 180
Conduction Angle ()
Figure AN1003.3 Half-Wave Phase Control (Sinusoidal)
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com for current information.
Phase Control Using Thyristors
http://www.Datasheet4U.com

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AN1003 pdf
Teccor® brand Thyristors
AN1003
UJT Triggering Level
Pedestal
UJT Emitter Voltage
Cool
Hot
Load
Ramp
0
Time
D1 D2
R1
120 V
(60 Hz)
D3 D4
R2
R3
D5
R5
Temp
R4 T
R6 "Gain"
R7
D6
C1
R8
Q1
T1
Q2
Triac
R1, R2 = 2.2 k, 2 W
Q1 = 2N2646
R3 = 2.2 k, 1/2 W
Q2 = Q4010L5
R4 = Thermistor, approx. 5 k T1 = Dale PT 10-101
at operating temperature
or equivalent
R5 = 10 k Potentiometer
D1-4 = 200 V Diode
R6 = 5 M Potentiometer
D5 = 20 V Zener
R7 = 100 k, 1/2 W
D6 = 100 V Diode
R8 = 1 k, 1/2 W
C1 = 0.1 μF, 30 V
Figure AN1003.13 Precision Proportional Temperature Control
Several speed control and light dimming (phase) control
circuits have been presented that give details for a
complete 120 V application circuit but none for 240 V.
Figure AN1003.14 and Figure AN1003.15 show some
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operation along with 120 V values for comparison. Even
though there is very little difference, there are a few key
things that must be remembered. First, capacitors and
Triacs connected across the 240 V line must be rated at
400 V. Secondly, the potentiometer (variable resistor) value
must change considerably to obtain the proper timing or
triggering for 180º in each half-cycle.
Figure AN1003.14 shows a simple single-time-constant
light dimmer (phase control) circuit, giving values for both
120 V and 240 V operation.
©2008 Littelfuse, Inc.
Specifications are subject to change without notice.
Please refer to http://www.littelfuse.com for current information.
Load
L1
C1
R2
3.3 k
R3 *
100
AC
Input
R1
D1
Q1
C2 0.1 μF HT-32
100 V
C3 *
Note: L1 and C1 form an
RFI filter that may be eliminated
* dv/dt snubber network
when required
AC AC
Input Load
Voltage Current
R1
C1, C3
L1
Q1
120 V ac 12 A
60 Hz
240 V ac 3 A
50/60 Hz
250 k
500 k
0.1 μF 200 V 100 μH Q4010LH6
0.1 μF 400 V 200 μH Q6004L4
Figure AN1003.14
Single-time-constant Circuit for Incandescent
Light Dimming, Heat Control, and Motor
Speed Control
The circuit shown in Figure AN1003.15 is a double-
time-constant circuit which has improved performance
compared to the circuit shown in Figure AN1003.14. This
circuit uses an additional RC network to extend the phase
angle so that the Triac can be triggered at small conduction
angles. The additional RC network also minimizes any
hysteresis effect explained and illustrated in Figure
AN1003.10 and Figure AN1003.11.
Load
AC
Input
C1
L1
R1
3.3 k
R2
R3
15 k
1/2 W
C2 C3
0.1 μF
100 V
Note: L1 and C1 form an
RFI filter that may be eliminated
R4 *
Q1 100
D1
HT-32
C4 *
* dv/dt snubber network
when required
AC AC
Input Load
Voltage Current
R2
120 V ac 8 A
60 Hz
250 k
240 V ac 6 A
50 Hz
500 k
240 V ac 6 A
60 Hz
500 k
C1, C2, C4
L1
Q1
0.1 μF 200 V 100 μH Q4010LH5
0.1 μF 400 V 200 μH Q6008LH4
0.1 μF 400 V 200 μH Q6008LH4
Figure AN1003.15
Double-time-constant Circuit for
Incandescent Light Dimming, Heat Control,
and Motor Speed Control
Phase Control Using Thyristors

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