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SKHIT 01 ...
Absolute Maximum Ratings Symbol Conditions
Isolation test voltage input - output (2 sec. AC) Operating temperature Storage temperature
Ta = 25 unless otherwise specified C, Values
2500 0 ... + 60 - 25 ... + 70
Units
V C C
Characteristics Symbol Conditions
Ta = 25 unless otherwise specified C, min. typ.
480 400 12 8,3 15 60 150
max. Units
528 15 10 15,6 V mA s kHz V mA mA V V mA V mA Veff Veff Veff
SEMIDRIVER
TM
Thyristor driver for three phase half controlled bridge
SKHIT 01 Preliminary Data
Features
* patent DE 197 10 371 * SKHIT 01 can be soldered directly onto a printed circuit board * Isolation by transformers (DC/ DC) and opto couplers (signal)
Operating voltage (phase to phase) Trigger current (output) Trigger current pulse length Pulse current cycling frequency Power supply Supply voltage Supply current (standby) Supply current (max.) Signals Thyristor trigger enable threshold (HIGH) Thyristor trigger enable threshold (LOW) Input current "On" Open collector error output (error = Low) UCE (IC = 4 mA) IC Maximum rating voltages Power to earth (overvoltage cat. III) Power to logic (overvoltage cat. II) Logic to earth
10 6,6 14,4
3,9 -0,5 10
5,5 1
1 5 300 900 60
Typical Applications
* DC-link voltage converter with precharge circuit
1976
Driver Electronic - PCB Drivers
23-02-2004
(c) by SEMIKRON
PIN array
Interface
(Power connectors: Plug connector RM 2,54 mm for soldering onto the PCB)
PIN X1 X2 X3 X4 X6 X8 X10 X17 X18 X19 X20 X22 X24 Signal +UG TG1 TG2 TG3 L1 L2 L3 + 15 V NC BSS BSS THO BB System ground connection System ground connection SCR / thyristor trigger enable Error indication Description Ground connection secondary circuit Gate SCR / thyristor 1 Gate SCR / thyristor 2 Gate SCR / thyristor 3 Line voltage L1 Line voltage L2 Line voltage L3 + 15 V - supply voltage
Fig. 1 Block diagram of SKHIT 01
1976
(c) by SEMIKRON
84
6,5
5,08
17,78
2,54
2,0
drilling diameter: 0,8 mm
Fig. 2 Dimension drawing and PIN array of SKHIT 01
(c) by SEMIKRON
17
1977
38
SCR / Thyristor Trigger Module 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).
Description of the block diagram (Fig. 1) 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 10s 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. 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.
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 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. 1978 (c) by SEMIKRON

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