Current Commutated Thyristorised Chopper with Power Supply Manufacturer,Supplier and Exporter in India
Product Code : SCL-EELE-12908
Indian Lab Suppliers supplies the Current Commutated Thyristorised Chopper with Power Supply (Product ID: 12908) as part of its electronics engineering lab equipment range. It is a step-down DC chopper in which the main SCR is turned off by a resonant current pulse that forces its current to zero.
Quick Answer
When the auxiliary SCR is fired, an LC circuit drives a current pulse opposite to the load current through the main SCR; once the net current falls to zero it turns off, and the gentler turn-off compared with voltage commutation is the point of study. Gate pulses come from a UJT relaxation oscillator, op-amp, timer IC and hex inverter, delivered by two NPN transistors through two 1:1 pulse transformers. Two potentiometers set the chopping frequency and the reference voltage. Supplies are ±12 V DC and 5 V DC at 100 mA regulated, with a bridge rectifier for the DC input, and the board runs from 230 V ±10%, 50 Hz mains. A load is not listed; please confirm it at quotation.
Key Specifications
| Parameter | Detail |
|---|---|
| Type | Step-down, current commutated |
| Power devices | 2 SCRs (main and auxiliary); inductors |
| Pulse generation | UJT, op-amp, timer IC, hex inverter; 2 NPN transistors; 2 pulse transformers 1:1 |
| Controls | Frequency and reference-voltage potentiometers |
| 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 Voltage Commutated Thyristorised Chopper with Power Supply (Product ID: 12907) and the Step down & Step up transistor chopper (Product ID: 12924). Browse the full Electronics Engineering Lab Equipment range or related Electronics Lab Equipment products.
Frequently Asked Questions
How does current commutation work?
A resonant pulse opposes the load current in the main SCR until its current reaches zero.
What can be adjusted?
Chopping frequency and reference voltage.
How is it different from the voltage commutated chopper?
The SCR turns off at zero current instead of being hit with a sudden reverse voltage.
Related Categories
Electronics Engineering Lab Equipment · Electronics Lab Equipment · Engineering Lab Equipment
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