Thyristor Devices

Introduction to
Thyristor Devices
Outline
 SIDAC Applications
– Gas Ignition Applications
 Operation - High Energy
SIDAC
– HID Lighting Applications
 Operation – High Pressure
Sodium (Std SIDAC)
 Operation - Metal Halide (MP
SIDAC)
 SCR Applications
 AC Power Applications
– Triac Operation (Quadrants &
Variants)
– Triac Packages (High Temp)
– Triac Circuits
 Cascade Heater Control
 Isolated Solid-State Relay
– High Power 2 x SCR Operation
(1.414 X Rating)
– Engine System Voltage Regulator
 High Power SCR
– Animal Control Fencer
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SIDAC Gas Ignition Applications
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SIDAC Gas Ignition Circuit
Gas Igniter Control
Sidac for Gas
Igniter Circuit
Littelfuse High Energy SIDAC devices
offer solid-state performance and
reliability at GDT energy levels:
• Precision Switching Voltage
Charge
Fire
• No Aging Effects
• Lower Power Dissipation
SIDAC
K2200EH
Nominal
Switching
Voltage
Single
Chip
Package
E=TO-92
G=DO-15
S=SMB
High
Energy
SIDAC
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SIDAC HID Lighting Applications
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SIDAC HID Lighting Ignition
High Pressure Sodium Lighting – Standard SIDAC
SIDAC = Voltage Controlled Switch
Charge
Fire
Std SIDAC Starter Circuit Must
Produce 1500V Pulse Every AC
Half Cycle to Strike HPS Lamp
K2200E
SIDAC
Nominal
Switching
Standard
Voltage
SIDAC
Package
E=TO-92
G=DO-15
S=SMB
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SIDAC HID Lighting Ignition
Metal Halide Lighting – Multi-Pulse SIDAC
Ballast
The Multi-Pulse SIDAC Starter
Circuit Must Produce Three
4000V Pulses Every AC Half
Cycle to Strike Metal Halide
Lamp
Package
K2401G
SIDAC
G=DO-15
Nominal
MultiSwitching
Special Note:
Pulse
Voltage
For Combination Starters
SIDAC
Multi-Pulse SIDACs may also
be used in High Pressure
Sodium Applications
Igniter
unit
Lamp
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Outline
 SIDAC Applications
 AC Power Applications
– Gas Ignition Applications
 Operation - High Energy SIDAC
– HID Lighting Applications
 Operation – High Pressure
Sodium (Std SIDAC)
 Operation - Metal Halide (MP
SIDAC)
 SCR Applications
– Triac Operation (Quadrants &
Variants)
– Triac Packages (High Temp)
– Triac Circuits
 Cascade Heater Control
 Isolated Solid-State Relay
– High Power 2 x SCR Operation
(1.414 X Rating)
– Engine System Voltage
Regulator
 High Power SCR
– Animal Control Fencer
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SCR Applications
Engine System Voltage Regulator
 Non-Automotive Gasoline or Diesel Engines > 500cc
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∿
Battery Charge
Control Circuit
Starter &
Electrical
System
SCR = Silicon Controlled Rectifier
1. Blocks all current when off.
2. Conducts forward current when
turned on by injecting gate current.
3. Never conducts reverse current.
-
Engine
Alternator
Battery
+
SCR Engine System
Voltage Regulator
SCR
Part Number Breakdown
S6055R
SCR
·l·
Voltage
Rating 10
Current
Rating
Package
K: TO-218AC (Isolated)
M: TO-218AC
J: TO-218X (Isolated)
W: TO-218X
R:TO-220
N: D2 Pak
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SCR High Voltage Supply
Animal Control Fencer
Timing and
Triggering
Circuit for
Slow
Pulsing
Rate

Features & Benefits

Efficient HV pulsing
supply
Reliable solid-state
components
Easy method to
control energy output
by capacitor selection
High dv/dt capability
for noise immunity
Wide range of SCR
ratings and packages
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Outline
 SIDAC Applications
 AC Power Applications
– Gas Ignition Applications
 Operation - High Energy SIDAC
– HID Lighting Applications
 Operation – High Pressure
Sodium (Std SIDAC)
 Operation - Metal Halide (MP
SIDAC)
 SCR Applications
– Triac Operation (Quadrants &
Variants)
– Triac Packages (High Temp)
– Triac Circuits
 Cascade Heater Control
 Isolated Solid-State Relay
– High Power 2 x SCR
Operation (1.414 X Rating)
– Engine System Voltage Regulator
 High Power SCR
– Animal Control Fencer
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AC Power Applications
Electric Heaters
Water Heaters
Machine Tools
Industrial Battery
Chargers
Compressors
Welders
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Triac Operation
Triac
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Solid-state On/Off Control
Variable Power Control
(Phase Control)
Use on Resistive Loads
(Heaters, Lights, etc.)
Available to 125ºC
Alternistor Triac

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
Notice: Triacs operation use
only two quadrants

Triac Variant
Excellent Commutating
No Quadrant IV Operation
Use on Inductive Loads
(Motors, Coils, etc.)
Available to 150ºC
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Triac Part Numbers and Packages
Triac Part Numbering
Fastpak
HQ: 150ºC Alternistor
7: 100mA
TO-218X
TO-218AC
15: 15A
16: 16A
25: 25A
30: 30A
35: 35A
40: 40A
TO-220AB
TO-263
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Power Triac Driven by Low Current Triac
in Heater Control Circuit
Features & Benefits




Q1 operates in
quadrants 1 and 4
Q2 operates in
quadrants 1 and 3
All Solid-State
PIC Micro Processor
controlled (see App
Note AN1003 for
more details)
Design Constraints
• Controller ground is the AC power neutral line.
• Controller can only output positive signals.
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Isolated Solid State Switch or Relay
Control Circuit
Opto Coupler
Features & Benefits





Power Triac driven by
Opto Coupler
Opto Coupler is isolated
switch for AC line gate
supply
Power Triac operates in
quadrants 1 and 3
All Solid-State
Opto Coupler can be
randon turn-on or zero
crossing turn-on type
(see App Note AN1007
for more details)
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High Power Anti-Parallel SCR Circuit
20HP
Motor
Tachometer
Signal
240VAC
∿
Motor Speed
Control Circuit
Features & Benefits


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
Low Part Count
All Solid-State
No Moving Parts
Immune to
Commutation Issues
High Current Rating
Possible
Synchronized Soft
Start
Current Rating = 1.4 x SCR Current Rating
(e.g. 70A SCR  98A Current Rating)
Opto-Isolated Triac
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Introduction to
Thyristor Devices
Thank You!
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