2021-01-17

## How does a dual converter work?

In a dual converter, two converters are connected together back to back. One of the bridge works as a rectifier (converts AC to DC), another half bridge works as an inverter (converts DC to AC) and connected commonly to a DC load.

### What is the function of circulating current reactor in dual converter?

Explanation: Reactor (inductance) is added in circulating current mode between both the converters. The reactor limits the current to a reasonable value.

#### What happens if there is no circulating current in dual converter?

1) Dual Converter Operation without Circulating Current In this type of dual converter, only one converter is in conduction and another converter is temporarily blocked. So, at a time one converter operates and the reactor is not required between the converters.

What are the advantages of dual converter?

Explanation: Dual converters provide four quadrent operation, which means voltage can be positive or negative and so can be the current. Hence, AC-DC, DC-AC any converter configuration can be used.

How many thyristors are required for full converter?

Clarification: Full converter requires 4 thyristors.

## What is meant by semi converter?

7.1 (a) shows a single-phase half-controlled (semiconverter) rectifier. This configuration consists of a combination of thyristors and diodes and used to eliminate any negative voltage occurrence at the load terminals.

### What is the principle of phase control?

Phase-fired control (PFC), also called phase cutting or “phase angle control”, is a method for power limiting, applied to AC voltages. It works by modulating a thyristor, SCR, triac, thyratron, or other such gated diode-like devices into and out of conduction at a predetermined phase of the applied waveform.

#### What is the use of inductor in a dual converter?

Protecting the load from over voltage.

How many thyristors does a semi converter need?

Explanation: Semi-converter requires two thyristors. Thyristor Th1 is fired at angle of α and Th2 at angle π+α with respect to the supply voltage v and the process is repeated continuously.

How many thyristors are required for half converter?

How many thyristors does we need in half wave converter? Clarification: Only one thyristor is sufficient for the half wave converter purpose, this is employed for small motors only. This thyristor is connected to the single-phase AC supply and with parallel combination of free-wheeling diode with motor armature.

## What are the applications of semi converter?

Phase controlled rectifier applications include paper mills, textile mills using DC motor drives and DC motor control in steel mills.

• AC fed traction system using a DC traction motor.
• electro-metallurgical and Electrochemical processes.
• Reactor controls.
• Magnet power supplies.
• Portable hand instrument drives.

### How does a three phase dual converter work?

In three phase dual converter, we make use of three phase rectifier which converts 3 phase AC supply to DC. The structure of the converter is same as single phase dual converter. The output of three phase rectifier is fed to filter and after filtering the pure DC is fed to the load.

#### How does a dual phase rectifier work?

The processes are similar to single-phase dual converter. The three-phase rectifier will do the conversion of the three-phase AC supply to the DC. This DC is filtered and given to the input of the second converter. It will do the DC to AC conversion and the output that we get is the three-phase AC.

Can a single phase dual converter be used with four quadrants?

The single phase full converters allow only two quadrant operation with inductive loads to extent the operation to four quadrant the dual converters are used. –> Dual converters are suitable for high power applications but not for low power applications. *The below circuit explains 1-φ dual converters with circulating current.

When do you use a 3 phase inverter?

A 3 phase inverter is used to convert a DC i/p into an AC output. It includes three arms which are usually delayed through 120° of an angle to produce a 3 phase AC supply.