datasheet

SKHIT 01 (R) ...
Absolute Maximum Ratings
Symbol Conditions
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Characteristics
Symbol Conditions
SEMIDRIVER
TM
Thyristor driver for three
phase half controlled
bridge
SKHIT 01 (R)
Preliminary Data
Features
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Typical Applications
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Units
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1
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Values
min.
typ.
max.
Units
.-8
606
78
7
80
1
!3
9
(<
.
6
.
.06
1
!3
!3
.0.
1
1
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.
1
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707
0
'0.
.
1
1
6
1
This technical information specifies semiconductor devices but promises no
characteristics. No warranty or guarantee expressed or implied is made regarding
delivery, performance or suitability.
25-05-2007 MHW
© by SEMIKRON
PIN array
Interface
(Power connectors: Plug connector RM 2,54 mm for soldering onto the PCB)
PIN
Signal
Description
X1
+UG
Ground connection secondary circuit
X2
TG1
Gate SCR / thyristor 1
X3
TG2
Gate SCR / thyristor 2
X4
TG3
Gate SCR / thyristor 3
X6
L1
Line voltage L1
X8
L2
Line voltage L2
X10
L3
Line voltage L3
X17
+ 15 V
X18
NC
X19
BSS
System ground connection
X20
BSS
System ground connection
X22
THO
SCR / thyristor trigger enable
X24
BB
+ 15 V - supply voltage
Error indication
Fig. 1 Block diagram of SKHIT 01
2
2007-05-25
© by SEMIKRON
17
6,5
38
84
5,08
17,78
2,54
2,0
drilling diameter: 0,8 mm
Fig. 2 Dimension drawing and PIN array of SKHIT 01
© by SEMIKRON
2007-05-25
3
SCR / Thyristor Trigger Module
Description of the block diagram (Fig. 1)
SKHIT 01
The SCR / thyristor trigger module SKHIT 01 has been
designed for triggering half controlled bridges.
Application range
When switching on a DC-link voltage converter the
DC-link capacitors are uncharged and are, thus,
signalizing a short circuit situation to the applied supply
voltage. Therefore, the charge current has to be limited to
the rated value by switching suitable circuits; SEMIKRON
prefers to realize those circuits without electromagnetic
components such as relays or contactors. Instead of an
uncontrolled B6-diode input bridge (B6U), a half-controlled
diode thyristor bridge is used (B6H).
A cycle generator (4) and a decimal counter (5) generate
square-wave signals, which are to each other
time-delayed with a cyclic duration factor of 10µs and a
frequency of 10kHz. These pulses are directed to the
single thyristor gates via comparators and output
amplifiers (6) as well as series resistors (7). If the voltage
applied to the thyristor is negative or if there is no release
signal, the trigger pulse signals will be suppressed. The
phase relationship of the driver pulses is independent of
the phase relationship of the line voltage.
The trigger enable signal (THO) is transmitted to the
process logic via an optocoupler (3).
The ground connection of the control logic of an inverter is
not identical with the ground connection of the thyristors.
The ground connection potential of the secondary circuit
of the thyristor trigger stage (BSU) is identical with the
positive rectifier output voltage "+UG", while the input
ground connection potential normally is identical with the
logic potential "BSS". The required supply voltage is
transmitted via a DC/DC-converter (1).
The feedback signal "ready for operation" (BB) is set to
LOW, if the thyristor trigger enable signal is not applied
(THO=Low).
Mounting instructions
• The SKHIT 01 thyristor driver has been designed for
vertical mounting (soldering) to PCBs.
• The driver should be placed as close as possible to the
thyristors.
• The necessary creepage paths on the PCB have to be
dimensioned according to the application-specific
voltage ratings.
Fig. 3 Charge circuit
At the beginning of the switch-on process the thyristors
are blocked, the DC-link capacitors are charged via diodes
D1 - D3 and Rcharge (fig. 3). After having finished the
charging process, the thyristors have permanently to be
triggered by a driver stage such as the SKHIT 01.
Technical explanations
Further application notes
The PCB-mountable thyristor driver SKHIT 01 is delivered
as a subcomponent for a driving system dimensioned by
the user. The responsibility for proper system operation,
especially with view to keeping the valid standards, is
taken only by the user.
Conventional thyristor drivers use to trigger the thyristors
in synchronization with the line voltage, i.e. the trigger
signal is given out at a (variable) phase angle of the line
voltage. However, such an angle control is only necessary
for controlling the rectifier output voltage.
The SKHIT 01 fades out the trigger pulses at negative
thyristor voltage.
This technical information specifies devices but promises no characteristics. No warranty or guarantee expressed or
implied is made regarding delivery, performance or suitability.
4
2007-05-25
© by SEMIKRON