Engineering, Polytechnic and Vocational Training Equipment-> Power Electronics Experimental Modules

1 [2] 3 [«Back ||Next »]   Click to Enlarge SCR TRIGGER APPLICATIONS TRAINER. MODEL IBL-PE-14 This is an SCR trigger circuits trainer. This consists of ready-made circuits on board. The circuits included on this trainer are for (a) AC regulators scheme, (b) Digital firing circuit scheme, and (c) Op-Amp firing circuit schemes. This can be used as a ready-made firing circuit for SCR applications. This can be used in conjunction with Power device module Model PE-27. This trainer has all the necessary power supplies for on board electronics. See Enlarge Click to Enlarge UJT AND SCR TRIGGER CIRCUITS TRAINER. MODEL IBL-PE-15 This trainer is intended to study the different type of triggering circuits for the SCR applications. The types of trigger are Synchronized firing angle that can be controlled from 0 to 1800, Phase shift triggering in the range of 0 to 1800 and UJT Triggering. In order to provide necessary gate signals to the thyristor, a built-in power transformer with buffer circuit is provided. For the purpose of experimentation, necessary components like resistors, potentiometers, diodes, capacitors are available onboard. The circuits are to be inter-connected using patch cords to study the experiments. This trainer has necessary power supplies, 12V AC transformer for waveform comparison on one channel of oscilloscope. An external dual beam oscilloscope is required to observe the control signals. Specifications: Uni-Junction Transistor ? 1 No Thyristor : 1 No The Thyristor used works on CLIP ASSEMBLY technology with a) An average ON-State current of 10A @ 180? conduction angle. b) Critical rate of rise of on-state current 50 A/ ?sec. c) Peak gate current with 4A. d) Average gate power dissipation 1 Watt. e) Maximum peak reverse gate voltage 5 V. f) Threshold voltage 0.77V. g) Average gate power dissipation 1Watt h) Pulse transformer with two outputs i) Potentiometer: Two numbers of suitable potentiometers j) Buffer transistor: 1 No k) 12 AC transformer for waveform comparison. l) All assembled in an elegant FRP cabinet. See Enlarge Click to Enlarge SCR REGULATED POWER SUPPLY. MODEL IBL-PE-16 This is a DC power supply experimenter. This makes use 4 SCRs in full bridge configuration. This has built in firing circuit and suitable snubbers are provided. The output is 24 V @ 500mA. Using this experimenter it is possible to observe the Load current and voltage waveforms for pure resistive loads. Suitable heat sinks are provided. See Enlarge Click to Enlarge IGBT CHOPPER CIRCUIT. MODEL IBL-PE-17 IGBT chopper driver circuit consists of a PWM waveform generator, and a hybrid driver circuit, with de-saturation detection. The pulse-input circuit is optically isolated from the driver circuit, The output circuit from this driver protects the IGBT module from dangerous transient voltages. The de-saturation trip time can be adjusted by a suitable capacitor in the driver stage. NOTE: It is important to note that, dangerous voltage will exist when IGBTs are connected to this circuit. So all the precautions must be taken to avoid any fatalities while conducting the experiment. Specifications: Pulse input : There is a built in PWM generator. PWM : Repetition rate is adjustable in the range of 100Hz to 1KHz and TTL Duty cycle : Duty cycle is adjustable in the range of 10% to 90% Opto-Isolator : 30kV/uSec. Electrical Isolation : Viso = 2500Vrms for one minute. Recommend for use with: Vces of 600V Facility to connect an external PWM also as input to the driver circuit Input to the driver : internally generated PWM or external PWM can be given as input to this driver and it is optically isolated. See Enlarge Click to Enlarge IGBT TRAINER. MODEL IBL-PE-18 Insulated Gate Bipolar Transistor (IGBT) is a switching transistor that is controlled by voltage applied to the gate terminal. Device operation and structure or similar to those of an insulated gate field effect transistor (IGFET) more commonly known as MOSFET. The principle difference between the two device types is that the IGBT uses conductivity modulation to reduce the ON state conduction losses. The IGBT consists of IGBT power setup along with hybrid driver circuit having isolation between input and output with built-in Opto-coupler. A built-in de-saturation detector provides necessary short circuit protection. An LED will indicate the short circuit activation signal. Using this trainer it is possible to study V-I characteristics of (a) VCE test, (b) Resistive load switching test, and (c) Half bridge switching test circuit. This unit has necessary gate drive circuits. This requires external instruments as support equipment. 1. High voltage, high current DC source Model PES-1 2. 10 A DC current meter 3. Variable Resistive Load 4. Variable inductive Load Specifications: IGBT : Collector Emitter voltage :VCES = 600V DC Collector current : IC.nom = 50A Repetitive peak Collector current : ICRMvvvv = 100A Total power dissipation : PTOT = 280Watts Gate emitter peak voltage : VGES = 20V DC forward current : IF = 50A Collector Emitter saturation voltage : VCesat = 2.2V Gate threshold voltage : VGEth = 5.5 V Collector cutoff current : ICES = 1mA This trainer must highlight the following features of an IGBT. measurement of switching losses (IGBT and diode) measurement of on-state losses(IGBT and diode) overall loss evaluation short circuit test evaluation of the driver circuit under different boundary conditions comparison of the IGBT behavior under different conditions (voltage, driving, temperature, freewheeling diode) NOTE: it is important to note that, dangerous voltage will exist when IGBTs are connected to this circuit. So all the precautions must be taken to avoid any fatalities while conducting the experiment. See Enlarge Click to Enlarge SERIES INVERTER EXPERIMENTER. MODEL IBL-PE-19 The circuit that converts DC power into AC power is called as inverter. This is a Thyristor based system. If the thyristor commutation circuit of the inverter is in series with the load, then it is called as series inverter. This works on the resonance frequency of the circuit. This trainer makes use of SCR Trigger Applications Trainer Model PE-14 for SCR applications. This has built in carrier frequency generator, power circuit and required power supply. Using this instrument, it is possible to observe the resonance frequency, carrier frequency, voltage and current waveforms for the applied load conditions using an external oscilloscope. An optional voltmeter and current meters are required to make the necessary measurements. See Enlarge Click to Enlarge PARALLEL INVERTER EXPERIMENTER. MODEL IBL-PE-20 The circuit that converts DC power into AC power is called as inverter. This is a Thyristor based system. This works on the resonance frequency of the circuit. This trainer makes use of SCR Trigger Applications Trainer Model PE-14 for SCR applications. This has built in carrier frequency generator, power circuit and required power supply. All the power devices are mounted on suitable heat sinks. Using this instrument, it is possible to observe the resonance frequency, carrier frequency, voltage and current waveforms for the applied load conditions using an external oscilloscope. An optional voltmeter and current meters are required to make the necessary measurements. See Enlarge Click to Enlarge CURRENT & VOLTAGE COMMUTATION EXPERIMENTER. MODEL IBL-PE- 21 This trainer is intended to experiment and see how the current and voltage commutation circuit performs for different load conditions. This trainer has basic (a) Thyristorised power circuit with necessary commutation, (b) Chopper triggering circuit for SCR applications, and (c) a power supply for the triggering circuit only. This requires an optional variable high voltage DC power supply. It must be in the range of 0 to 240V DC operating at 3A under peak load conditions. This will be used as power source for applying to different types of loads. These loads can be pure resistive or combination of R-L-C. All these are optional. Using this trainer it is possible to observe load voltage, load current, commuting capacitor voltage, commuting capacitor current, for pure resistive loads using an Oscilloscope. For this you need suitable extra Voltmeter and Ammeter. The interconnections are established by using suitable patch cords. All the necessary circuit points are terminated on 4mm banana sockets for interconnections Specifications: Thyristorised power circuit, operating at 230V @ 2A under peak load conditions Chopper Triggering circuit for exciting Thyristor power circuit operating at a frequency of 50 to 300 Hz. Low voltage power supplies suitable for chopper circuit. All the above placed in an ergonomically designed cabinet. Optional: Variable High voltage 0 to 240V DC @ 3A power supply Model PES-1 Loading Rheostat 2A to act as pure resistive load Loading inductor (Air core type) @ 5A Loading Capacitor bank Suitable table top Voltmeter Suitable table top Ammeter See Enlarge Click to Enlarge SCR DC CIRCUIT BREAKER EXPERIMENTER. MODEL IBL-PE-22 A circuit breaker by the very name it suggests that, it is a mechanism, by which the power circuit must be disabled / disconnected if the output exceeds beyond a set current range. This facilitates the saving of men and material from any possible destruction. In this trainer, the circuit breaker is essentially monitors the load current. The sensing circuit determines the maximum load current CUTOFF point, beyond which the circuit should not function. In order to demonstrate this principle, an SCR based SSR is used in this trainer. This trainer comes with load current limiting circuit. This trainer consists of DC power source at 12VDC @ 1A as supply to the load circuit. Suitable current limiting circuit measures the load current. An Ammeter measures the load current. It is possible to preset the load current in the range of 100mA to 800mA at load circuit side. An SCR based switch is used to cutoff the load supply to the loading circuit, when the load current exceeds beyond set current limits. An external loading rheostat NOT more than 1A is required to load the circuit. Specifications: Load current limiting : between 100mA to 800mA Analog Current meter : 1A DC FSD monitors load current. Current limit : By preset potentiometer. Note: An external loading rheostat NOT more than 1A is required See Enlarge Click to Enlarge ZERO CROSSING DETECTOR WITH POWER DRIVER. MODEL IBL-PE-23 A Zero Crossing Detector (ZCD) is one, which transforms the synchronizing signal into a square wave signal. By the very name it suggests that some thing should happen if it crosses 0V or if it crosses any preset voltage levels. One of the following can be obtained. (a) The output should be ON when the incoming signal is positive going and should and the output should be 0V, for the negative going signal. All signals commensurate w.r.t.DC. (b) Alternately output should be 0V when the incoming signal is positive going and the output should be ON, for the negative going signal. This can be accomplished by using diodes in the respective paths. One of the above refered signals are used to activate another output device. It could be a hardware, or a control circuit etc. In this trainer the process of ZCD is experimented. In order to understand better, the experimenter has a variable reference signal to observe how the ZCD output behaves. The instrument is provided with necessary circuits to accomplish this task. See Enlarge Click to Enlarge STUDY CHARACTERISTICS OF SCR, IGBT, MOSFET TRAINER. MODEL IBL-PE-24 This trainer has all the three power electronic components. Using this trainer the VI characteristics of the above can be performed under static conditions. All the terminals of the devices are brought out on the front panel for necessary interconnections to meters, and load. This consists of a Volt and Ammeters to measure the necessary currents. See Enlarge Click to Enlarge SINGLE PHASE THYRISTOR CONTROLLED DC SHUNT MOTOR. MODEL IBL-PE-25 This electrical setup is used in POWER ELECTROINCS LAB to study the No load characteristics of a DC SHUNT motor. A shunt motor is connected in the same way as a shunt generator. The field windings are connected in parallel (shunt) with the armature windings. Once you adjust the speed of a dc shunt motor, the speed remains relatively constant even under changing load conditions. One reason for this is that the field flux remains constant. The DC shunt motor has two windings, namely Armature winding and Field winding. In order to activate the motor, both Field and armature windings have to be given sufficient power to enable them to start under controlled condition. Since the consumption of current by the armature is large compared to field current, when the motor is at rest, it is necessary to excite the armature gradually to enable the motor to start properly. It means, the field winding must provide the starting current, and eventually the current flowing through the field winding can be minimized, once the rated speed is achieved. Hence this leads to a conclusion that the armature current has to be provided in a controlled atmosphere starting from rest to rated speed. This needs further discussion for considering load conditions. There are several methods adopted for this purpose. The speed control is achieved by varying the firing angle of the thyristor, which is controlling the armature winding. In this experimental setup, the DC Motor is mechanically coupled to a Tachogenerator, to provide necessary feedback for the measurement of speed as set by the speed control potentiometer. This feedback signal is further processed through conditioning circuits and a suitable signal is provided to the triggering controller. The trigger circuit is further processed through pulse transformer, before applying as Gate signal to the Thyristors. This trainer has necessary power supplies, signal conditioners, feedback circuits, pulse triggering circuits, power driver, Ramp generator for smooth starting of drive, necessary current amplifiers and current limiting circuit, SCR firing controller, suitable pulse transformer for isolation and Opto-Isolator circuits. The scope of this trainer is limited to the extent of observing various waveforms at different points along the whole circuit flow, till the DC motor using an external 15MhZ oscilloscope. Specifications: There are two options of Motors are available. You must choose the correct option before placing your purchase order. The options are Option ?1, BENN make DC Motor with the following specifications will be supplied HP =1; RPM = 1500; Excitation voltage: 180V DC, Current handling: 5.1A;Class: B Option ?2, the DC Motor with the following specifications will be supplied. HP =0.25;RPM = 1500;Excitation voltage: 220V DC, Current handling: 1A;Class: B The following are common specifications for the rest of the equipment: ? Tachogenerator : It provides 33V DC / 1000 RPM ? Speed : 1500RPM ? Input voltage to the system : 220 V AC / Single phase ? Speed Indicator : An external Digital meter is supplied to indicate RPM ? Speed variation : 0 to 1500 RPM continuously variable. The Thyristor used works on CLIP ASSEMBLY technology with a) An average ON-State current of 10A @ 180? conduction angle. b) Critical rate of rise of on-state current 50 A/ ?sec. c) Peak gate current with 4A. d) Average gate power dissipation 1 Watt. e) Maximum peak reverse gate voltage 5 V. f) Threshold voltage 0.77V. g) Average gate power dissipation 1Watt. The following test points are available for observations using an Oscilloscope. ? Tachogenerator feedback voltage. ? Signal and summing amplifier. ? Signal conditioner output before the UJT firing circuit ? Relaxation oscillator output ? Pulse transformer output ? Anode and Cathode points of Thyristors for ARMATURE control ? Anode and Cathode points of FIELD windings Using the above trainer, the user can experiment and study 1. Plot the graph of Speed Vs Armature/ Field voltages. 2. Speed Vs No load characteristics. This is a table type model. However the motor assembly, need to be mechanically fastened to the table top with Nut and Screw arrangement for stability of operation at high speeds.The entire system is supplied with functional block diagrams printed on the front panel for easy identification of various blocks of the controller. Various test points are provided on the front panel for observations of signals at various points of the circuit. An external 15MhZ, dual beam Oscilloscope is required to observe the waveforms. See Enlarge Click to Enlarge SPEED CONTROL OF DC MOTOR USING THYRISTOR TRIGGERING. MODEL IBL-PE-26 This trainer is intended to study the speed control of DC Motor using Thyristor Triggering. Using this trainer, it is possible study and observes waveforms at different points of circuit, during study. Additional equipment like a Dual Beam Oscilloscope of 15MHz is required for observation of waveforms. This trainer consists of the following facilities. a. Speed adjustment potentiometer, b. Signal conditioning circuit, c. Pulse triggering circuit, d. Pulse transformer kit, e. Power driver circuit using thyristors, a PMDC Motor, f. Built-in Digital RPM indicator, and g. Necessary power supplies. Specifications: ? PMDC motor operating at 40V DC mounted on a stand and securely fastened. ? Maximum SPEED of the motor is 1440 RPM. ? Built-in Digital RPM indicator to observer the motor speed. ? Built in power supplies. The test points include observation of the following: a) Adjustable speed control voltage in the range of 0 to 5V DC. b) Waveforms to observe RAMP generator c) Trigger waveform produced by the triggering circuit d) Transformed pulse output e) GATE triggering of G1 and G2, f) Anode and Cathode points of SCRs. Thyristor: The Thyristor used works on CLIP ASSEMBLY technology with a) An average ON-State current of 10A @ 180? conduction angle. b) Critical rate of rise of on-state current 50 A/ ?sec. c) Peak gate current with 4A. d) Average gate power dissipation 1 Watt. e) Maximum peak reverse gate voltage 5 V. f) Threshold voltage 0.77V. g) Average gate power dissipation 1Watt. Uni-Junction Transistor (UJT) specifications: (Maximum ratings): a) Base 1 ? Emitter voltage 30V, b) Base 2 ? Emitter voltage 30V, c) RMS Emitter current 50mA, d) Emitter peak current 2A, e) Total Power dissipation 300Mw See Enlarge Click to Enlarge POWER ELECTRONICS DEVICE MODULE. MODEL IBL-PE-27 This is a general-purpose power circuit development panel. This consists of six numbers of thyristors and three numbers of power diodes. Using these devices, one can assemble any combination of SCR power circuits. This unit requires an external SCR trigger circuit with proper conditioning for gate firing. This unit has three fuse holders. The AC power required for enabling the power devices must be routed through fuses as a protective measure for the circuit board components. NOTE: The circuit developer must take adequate precautions while handling this board, as high voltages do exist when high voltage AC power is connected to this device circuit panel. For safety of the operator, it is necessary to have an external circuit breaker as part of AC power inlet connections. Specifications: Thyristors used : 6 Nos. Power diodes : 3 Nos. Fuse protection : on 3 lines Terminals : 4mm colored terminals for each device Patch cords : 4mm banana patch cords required. Thyristor: The Thyristor used works on CLIP ASSEMBLY technology with a) An average ON-State current of 10A @ 180? conduction angle. b) Critical rate of rise of on-state current 50 A/ ?sec. c) Peak gate current with 4A. d) Average gate power dissipation 1 Watt. e) Maximum peak reverse gate voltage 5 V. f) Threshold voltage 0.77V. g) Average gate power dissipation 1Watt. h) Snubber circuit is connected across each thyristor. Diode: 16Amps with PIV of NOTE: Suitable External SCR trigger circuit required as per your circuit design. Alternately SCR TRIGGER APPLICATIONS TRAINER Model PE-14 can be used. See Enlarge Click to Enlarge STUDY CHARACTERISTICS OF SCR, TRIAC, DIAC & MOSFET. MODEL IBL-PE-28 This trainer is intended to study the characteristics of SCR, TRIAC, DIAC and MOSFET devices. In order to facilitate the experimental procedure, necessary support peripheral components like lamp load is provided on the system for interconnections. In order the observe various waveforms of the devices on oscilloscope, an external 12 AC reference is available on board. This trainer has all the necessary components like potentiometers, switches, Transformer, lamp load etc is provided. These are required to conduct all the experiment of the devices. Note: (a) An external current meter in the range of 25mA AC to 2A is required to measure respective currents, (b) a dual beam oscilloscope, and (c) a high impedance volt meter are essential requirements. Specifications: Thyristor : 1 No The Thyristor used works on CLIP ASSEMBLY technology with a) An average ON-State current of 10A @ 180? conduction angle. b) Critical rate of rise of on-state current 50 A/ ?sec. c) Peak gate current with 4A. d) Average gate power dissipation 1 Watt. e) Maximum peak reverse gate voltage 5 V. f) Threshold voltage 0.77V. g) Average gate power dissipation 1Watt. MOSFET : 1 No DIAC : 1 No TRAIC : 1 No Lamp load : 230 AC @ 100Watts and 12 DC @ 100mA lamp ? 1 each Potentiometers : Wire wound ? 3 Nos. Transformer : 12 AC @ 100mA for waveform synchronization. Resistor, capacitor, diode of assorted values Power :230 V AC @ 50 Hz The entire instrument is housed in an elegant FRP cabinet. See Enlarge 1 [2] 3 [«Back ||Next »] Go to Top