Voltage Commutated Thyristorised Chopper with Power Supply Manufacturer,Supplier and Exporter in India
Product Code : SCL-EELE-12907
Indian Lab Suppliers supplies the Voltage Commutated Thyristorised Chopper with Power Supply (Product ID: 12907) as part of its electronics engineering lab equipment range. It is a step-down DC chopper using a main and an auxiliary SCR, in which the main SCR is turned off by applying a reverse voltage from a charged capacitor.
Quick Answer
A UJT relaxation oscillator, op-amp, timer IC and hex inverter generate the gate pulses, which two NPN transistors deliver through two 1:1:1 pulse transformers to the main and auxiliary SCRs. Firing the auxiliary SCR places the commutating capacitor across the main SCR, reverse-biasing it and ending each on-period, so varying the on-time changes the average output. The load is a 12 V, 6 W bulb with inductors and a freewheeling diode, and two SPST switches and a push-to-ON switch set up and start the circuit. Supplies are ±12 V DC and 5 V DC at 100 mA regulated, with a bridge rectifier for the DC input; the board runs from 230 V ±10%, 50 Hz mains.
Key Specifications
| Parameter | Detail |
|---|---|
| Type | Step-down, voltage commutated |
| Power devices | 2 SCRs (main and auxiliary); freewheeling diode; inductors |
| Pulse generation | UJT, op-amp, timer IC, hex inverter; 2 NPN transistors; 2 pulse transformers 1:1:1 |
| Switches | 2 SPST; push-to-ON |
| Load | Bulb, 12 V, 6 W |
| Supplies | ±12 V DC and 5 V DC, 100 mA regulated; bridge rectifier |
| Mains | 230 V ±10%, 50 Hz; ON/OFF switch, fuse and indicator lamp |
| Connections | 4 mm stackable patch cords, 0.5 m |
Where This Is Used
Studied alongside the Current Commutated Thyristorised Chopper with Power Supply (Product ID: 12908) and the D.C. Step down MOSFET Chopper with Power Supply (Product ID: 12922). Browse the full Electronics Engineering Lab Equipment range or related Electronics Lab Equipment products.
Frequently Asked Questions
How is the main SCR turned off?
A charged capacitor switched by the auxiliary SCR applies reverse voltage across it.
What controls the output voltage?
The ratio of on-time to period of the chopper.
What is the load?
A 12 V, 6 W bulb with inductors.
Related Categories
Electronics Engineering Lab Equipment · Electronics Lab Equipment · Engineering Lab Equipment
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