pstt pc / pstt sc / pstt zc powersem gmbh, walpersdorfer str. 53 91126 d- schwabach phone: 09122 - 9764-0 fax.: 09122 - 9764-20 1/3 ? 2006 powersem reserves the right to c hange limits, test conditions and dimensions active trigger units for thyristors pstt pc - controlled rectifiers, ac controllers, dc motor control, all other applications pstt sc - economic low cost ac controllers pstt zc - zero crossing switching ? heating, welding, power factor correction absolute maximum ratings type pstt pc/12 pstt pc/20 pstt sc/12 pstt sc/20 parameter symbol pstt zc/12 pstt zc/20 unit peak voltage-positive and negative vp 1200 2000 v nominal mains voltage vm 400 690 vrms continuous dc voltage v= 400 690 vdc turn-on delay for gate current >1a tgd 5 5 s input-output isolation vi 5300vrms 60hz 1min vde0884 input-output transient immunity (dv/dt)c 5000 v/s device transient immunity (dv/dt)d 2000 v/s ambient temperature range ta -25 to +85 c external gate cathode short circui t during operation can be destructive a2 g2 k2 g1 k1 k2 g1 k1 g2 the active trigger is an economic replacement o f pulse transformers including all associated circuitry in phase controlled thyristor equi pment. due to the small control current it becomes the ideal link between any size of thyristor and the control intelligence. each a ctive trigger can trigger two thyristors and is intended for mains voltages from 115v to 690vrms. its operation is based on an opt ically activated current source connected betw een anode and gate of the thyristor to be triggered. thus a small electrically isolated control current init iates a large gate current without the necessity of a gate drive power supply. three different applicati on specific types are available. topviewinmm top view in mm height 19 mm pstt pc pstt zc pstt sc height 23 mm pcb hole size 0.8 mm pcb hole size 0.8 mm
pstt pc / pstt sc / pstt zc powersem gmbh, walpersdorfer str. 53 91126 d- schwabach phone: 09122 - 9764-0 fax.: 09122 - 9764-20 2/3 ? 2006 powersem reserves the right to c hange limits, test conditions and dimensions technical data at 25c type pstt pc/12 pstt pc/20 pstt sc/12 pstt sc/20 parameter symbol pstt zc/12 pstt zc/20 unit 200ma gate current threshold vgtl 10 16 v 1.2a gate current threshold vgth 24 36 v 100v 2.5 1.2 a/s 200v 3 2 a/s 400v 4 2.5 a/s 800v 6 3 a/s gate current rise time at anode voltage of 1200v (di/dt)g 4 a/s peak gate current (typical) ip 1.3 1.3 a anode-cathode current at vp in 4.4 5.1 ma maximum off state gate current io 2* 2* a minimum control current icm 7 7 ma recommended control current ic 12 12 ma control input voltage drop at 12ma vi n typ. 1.2<1.5 typ. 1.2<1.5 v maximum reverse control input voltage vinr 6 6 v turn-on delay time at ic=12ma tdi 25 25 s zero crossing threshold for pstt zc vzt <20 <20 v *pstt zc < 40a highlights economic ? very easy to use ? small size ? powerful gate pulse tr iggers large and small thyristors. eliminates gate drive power s upply ? proven reliability in harsh industrial environment. application informations as the gate current is derived from the anode of the thyristor, the control circuit only needs to supply the recommended control current which can be supplied directly from the output of many logic devices. it is advisabl e to maintain the control current over the entire conduction period of the th yristor. once the thyristor is triggered, the gate current ceases to flow because the anode voltage drops below the threshold voltage. the control input consists of the light emitting diode of an optocoupler. any such optical component is subject to aging at elevated temperatures. although the minimum control current icm is well below 7ma, a 12ma cont rol signal is recommended to ensure reliable operation beyond 100?000 hours in a worst case design. the turn-on delay tdi can be reduced by pulse shaping, because it is inversely proportional to the control current. because the device derives its power from the anode of the thyristor, a minimum operating voltage is required before any curr ent can flow from the anode to the gate. this threshold voltage limits the minimum regulated output voltage. for example for a single-phase 115v ac controller triggered by a 1200v unit it is below 0.12%. for a 400v supply it is much less and can safely be neglected in most applications.
pstt pc / pstt sc / pstt zc powersem gmbh, walpersdorfer str. 53 91126 d- schwabach phone: 09122 - 9764-0 fax.: 09122 - 9764-20 3/3 ? 2006 powersem reserves the right to c hange limits, test conditions and dimensions the thyristor is triggered from a current s ource with a maximum vo ltage of 22v. this allows for twisted gate leads of up to 1m while maintaining a high rate of rise of the gate current. note that the envelope of the voltage across the thyristor to be triggered can have any desired shape provided the rms value is below vm and the peak value does not exceed vp. both the pstt sc and pstt zc have one cont rol input only. this means that the thyristor with a positive anode voltage will be tri ggered when a control signal is present. the connection diagrams below show the typica l application of the active trigger in mains operated systems using thyr istors with current ratings from a few amps up to several thousand amps. connecting diagrams +vs a2 g2 k2 g1 k1 + + - - 12ma sink logic output pstt pc +vs k1 g1 g2 k2 + - 12ma sink logic output pstt sc pstt zc
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