SKHIT 01 ... Absolute Maximum Ratings Symbol Ta = 25 °C, unless otherwise specified Conditions Isolation test voltage input - output (2 sec. AC) Operating temperature Storage temperature Characteristics Symbol 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) Values Units 2500 V 0 ... + 60 - 25 ... + 70 °C °C Ta = 25°C, unless otherwise specified Conditions 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 min. typ. 528 10 6,6 480 400 12 8,3 15 60 150 15,6 V mA mA 5,5 1 V V mA 1 5 V mA 14,4 3,9 -0,5 max. Units 15 10 10 300 900 60 V mA µs kHz Veff Veff Veff Typical Applications • DC-link voltage converter with precharge circuit 1976 Driver Electronic – PCB Drivers 23-02-2004 © 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 1976 © 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 1977 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 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). 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 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. 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 © by SEMIKRON