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Summary of Contents for Scientech Technologies 2703
- Page 1 SCR Triggering Techniques Scientech 2703 Learning Material Ver 1.1 An ISO 9001:2008 company Scientech Technologies Pvt. Ltd. 94, Electronic Complex, Pardesipura, Indore - 452 010 India, + 91-731 4211100, : info@scientech.bz , www.ScientechWorld.com...
- Page 2 Scientech 2703 Scientech Technologies Pvt. Ltd.
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Page 3: Table Of Contents
Table of Contents Safety Instructions Introduction Features Technical Specifications Theory Experiments Experiment 1 To Study the triggering of SCR using UJT Experiment 2 To Study the triggering of SCR using IC 555 Datasheet Warranty List of Accessories Scientech Technologies Pvt. Ltd. -
Page 4: Safety Instructions
Use in proper Atmosphere Please refer to operating conditions given in the manual. 1. Do not operate in wet / damp conditions. 2. Do operate explosive atmosphere. 3. Keep the product dust free, clean and dry. Scientech Technologies Pvt. Ltd. -
Page 5: Introduction
Scientech 2703 is a platform where Students can understand the various thyristor firing techniques by using IC 555 and UJT. This is very useful for understanding of pulse generation. 2703 is provided with in built power supplies, sockets for making interconnection in the circuit and exhaustive learning material. -
Page 6: Features
Easy to operate and understand • Two triggering circuits on single board • Test points to observe output pulses • Sockets to make different connections • On board DC sources of 5 V and 12 V Scientech Technologies Pvt. Ltd. -
Page 7: Technical Specifications
Dimensions (mm) W 420 x D 255 x H 100 Power Supply 110V - 260V AC, 50/60Hz Weight 1 Kg. (approximately) Operating Conditions 0-40 C, 80% RH Learning material CD (Theory, procedure, reference results, etc), Online (optional) Scientech Technologies Pvt. Ltd. -
Page 8: Theory
From the output voltage waveform it is clear that the output pulses has a very small width and that a long relaxation time exists between the two pulses. Therefore it is said that the device is relaxed in this duration and is called the relaxation oscillator. Scientech Technologies Pvt. Ltd. - Page 9 THE OUTPUT PULSE FROM UJT IS CONNECTED TO THE GATE OF SCR. BY USING A POT THE GATE CURRENT CAN BE CONTROLLED AND MONITOR THE ANODE TO CATHODE CURRENT. IT WILL SHOW AT WHICH POINT THE SCR IS GETTING TRIGGERED. Scientech Technologies Pvt. Ltd.
- Page 10 VC1 to rise from Vcc/3 to 2Vcc/3, and the section where the timer output is low is the time it takes for the VC1 to drop from 2Vcc/3 to Vcc/3. When timer output is high, the equivalent circuit for charging capacitor C1 is as follows: Figure 3 Figure 4 Scientech Technologies Pvt. Ltd.
- Page 11 THE OUTPUT PULSE FROM UJT IS CONNECTED TO THE GATE OF SCR. BY USING A POT THE GATE CURRENT CAN BE CONTROLLED AND MONITOR THE ANODE TO CATHODE CURRENT. IT WILL SHOW AT WHICH POINT THE SCR IS GETTING TRIGGERED. Scientech Technologies Pvt. Ltd.
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Page 12: Experiment 1
Scientech 2703 Experiment 1 Objective: To study the triggering of SCR using UJT Equipments Needed: Power Electronics Board Scientech 2703 Oscilloscope-Scientech 803/831, or equivalent 2 mm patch cords. Multi-meters Circuit diagram: The circuit diagram for Triggering of SCR using UJT is shown in figure 6 Figure 6 Scientech Technologies Pvt. - Page 13 To repeat the experiment switch off the power supply and follow the above procedure from step 4. Observation Table: Set V = +12V S.No Gate current Anode cathode Anode cathode (mA) current I (mA) voltage V Scientech Technologies Pvt. Ltd.
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Page 14: Experiment 2
Experiment 2 Objective: To study the Triggering of SCR using 555 IC. Equipments Needed: 1. Power Electronics Board Scientech 2703 2. Oscilloscope-Scientech 803/831, or equivalent 3. 2 mm patch cords. Circuit diagram: The circuit diagram for Triggering of SCR using 555 IC is shown in figure 7 as... - Page 15 Now vary the ‘P , there will not be any effect in the anode-cathode voltage and 1’ current of SCR. To repeat the experiment switch off the power supply and follow the procedure from step 4 Scientech Technologies Pvt. Ltd.
- Page 16 Scientech 2703 Observation Table: Set V = +12V Gate current Anode to cathode Anode to cathode S.No (mA) current I (mA) current V Scientech Technologies Pvt. Ltd.
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Page 17: Datasheet
These devices feature: Low Peak Point Current - 2 µA (Max) Low Emitter Reverse Current - 200 nA (Max) Passivated Surface for Reliability and Uniformity Maximum Ratings (T = 25°C unless otherwise noted.) "Indicates JEDEC Registered Date. Scientech Technologies Pvt. Ltd. - Page 18 Scientech 2703 Notes: Derate 3 mW/°C increase In ambient temperature. The total Power dissipation (available power to Emitter and Base-Two) must be limited by the external circuitry. Capacitor discharge - 10µF or loss, 30 volts or loss. Scientech Technologies Pvt. Ltd.
- Page 19 Scientech 2703 Scientech Technologies Pvt. Ltd.
- Page 20 Scientech 2703 Scientech Technologies Pvt. Ltd.
- Page 21 The TYN / TN16 SCR Series is suitable for general purpose applications. Using clip assembly technology, they provide a superior performance in surge current capabilities. Absolute Ratings (limiting values) TN16 and TYNx16 Series Electrical Characteristics (Tj = 25°C, unless otherwise specified) Scientech Technologies Pvt. Ltd.
- Page 22 Scientech 2703 Thermal Resistances s = Copper surface under tab Product Selector Scientech Technologies Pvt. Ltd.
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Page 23: Warranty
The repair work will be carried out, provided the product is dispatched securely packed and insured. The transportation charges shall be borne by the customer. List of Accessories 2mm Patch cords 16” ................4 Nos. Mains Cord....................1 No. Learning Material (CD) ................1 No. Scientech Technologies Pvt. Ltd. - Page 24 Single Phase Converter Firing Techniques (by TCA 785IC and Triangular Comparator) Scientech 2711 Lamp Dimmer Scientech 2712 Electronics Power Lab Scientech 2713 Single Phase Cyclo-Converter Scientech 2714 Speed Control of Universal Motor using SCR Scientech 2715 Speed Control of AC Motor using TRIAC Scientech Technologies Pvt. Ltd.
- Page 25 Step-Down Chopper (MOSFET,IGBT, Transistor & SCR Based) Scientech 2725 Step-Up Chopper (MOSFET, IGBT, Transistor & SCR Based) Scientech 2726 Buck Converter Scientech 2727 Boost Converter Scientech 2728 Flyback Converter Scientech 2729 Flyback Converter Scientech 2730 Buck Boost Converter and many more….…… Scientech Technologies Pvt. Ltd.
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