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# in circulating current mode dual converters, the circulating current is avoided by

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## [Solved] In a non

Explanation: Dual converter, the name itself says two converters. It is really an electronic converter or circuit which comprises of two converters. One will

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## In a non-circulating current mode dual converters, the circulating current is avoided by

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Connecting a series reactor

Maintaining α1 + α2 = 180°

Operating only one converter

Option 3 : Operating only one converter

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## Detailed Solution

Explanation:

Dual converter, the name itself says two converters. It is really an electronic converter or circuit which comprises of two converters. One will perform as a rectifier and the other will perform as an inverter. Therefore, we can say that double processes will occur at a moment.

In this, the circulating current allows smooth reversal of load current with improved speed of response. The circulating current helps in maintaining continuous conduction of both the converters irrespective of load and the time response to change the operation from one quadrant to other is faster.

Modes of Operation of Dual Converter:

There are two functional modes: Non-circulating current mode and circulating mode.

Circulating Current Mode:

Two converters will be in the ON condition at the same time. So, the circulating current is present.

The firing angles are adjusted such that the firing angle of converter 1 (α1) + firing angle of converter 2 (α2) = 180o.

Converter 1 performs as a controlled rectifier when firing angle be 0 < α1 < 90o and Converter 2 performs as an inverter when the firing angle be 90o < α2 < 180o. In this condition, Vdc and Idc are positive.

Converter 1 performs as an inverter when firing angle be 90o < α1 < 180o and Converter 2 performs as a controlled rectifier when the firing angle be 0 < α2 < 90o in this condition, Vdc and Idc are negative.

Non-Circulating Current Mode:

The circulating current does exist in both the converter circuits, but it is avoided by using a reactor in non-circulating type and by operating only one circuit in case of circulating type.

During the converter 1 operation, firing angle (α1) will be 0 < α1 < 90o; Vdc and Idc are positive.

During the converter 2 operation, firing angle (α2) will be 0 < α2 < 90o; Vdc and Idc are negative.

Conclusion:

In a non-circulating dual converter - One converter is operated at a time.

In circulating current dual converter - reactor + maintaining α1 + α2 = 180°

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Last updated on Nov 9, 2022

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Q1. In a non-circulating current mode dual converters, the circulating current is avoided byQ2. In a dual converter, if the firing angle of one bridge is 30°, then the firing angle of second bridge is ______.Q3. It is required to control the speed and braking operation of a dc shunt motor in both the directions of rotation. The most suitable power electronic circuit will be

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Q1. A bridge rectifier is an alternative for:Q2. The ripples at the output of the rectifier circuit can be remove by connecting:Q3.  A single phase, half wave controlled rectifier contains:Q4. Rectification efficiency and ripple factor of a full wave rectifier _____ and _____ respectively.Q5. What is the total angular period in the circuit shown below for which the diode provides half-wave rectification?Q6. In a single-phase half-wave controlled rectifier the firing angle is 30°. If the load is purely resistive, find the conduction period of the SCR.Q7. Which one of the following converters makes use of four Silicon Controlled Rectifiers?Q8. In a single-phase full-wave bridge circuit and in a three-phase, delta full-wave bridge circuit, what will be the ripple voltage frequency respectively?Q9. The frequency of the 7th harmonic for the fundamental frequency of 50 Hz is:

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## Solved In circulating current mode dual converters, the

Answer to Solved In circulating current mode dual converters, the

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## Dual Conveters Questions and Answers

This set of Power Electronics Multiple Choice Questions & Answers (MCQs) focuses on “Dual Converters-2”. 1. In circulating current mode dual converters, the circulating current is avoided by a) connecting a series reactor b) maintaining α1 + α2 = 180° c) operating only one converter d) adding an extra SCR 2. Choose the correct statement ... Read more

## Power Electronics Questions and Answers – Dual Converters-2

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This set of Power Electronics Multiple Choice Questions & Answers (MCQs) focuses on “Dual Converters-2”.

1. In circulating current mode dual converters, the circulating current is avoided by

a) connecting a series reactor

b) maintaining α1 + α2 = 180°

c) operating only one converter

2. Choose the correct statement

a) Circulating current exists only in circulating current mode

b) Circulating current exists only in non-circulating current mode

c) Circulating current exists in both the circulating and non-circulating current mode

d) none of the mentioned

3. What causes circulating current in dual converters?

a) Temperature issues

c) Out of phase voltages from both the converters

d) none of the mentioned

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4. Name the below given circuit.

a) Single-phase dual converter with circulating current type

b) Single-phase dual converter with non-circulating current type

c) Three-phase dual converter with non-circulating current type

d) Three-phase dual converter with circulating current type

5. In case of three-phase dual converter, one of the converter circuits is fired at an angle of 60°. For both the converter circuits to have equal average output voltage, what is the value of the firing angle for the other converter circuit?

a) 60° b) 120° c) 100°

d) Insufficient data

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6. In case of circulating current type dual converters, the reactor is inserted between

a) supply and converter

c) between the converters

d) no reactor is used in case of circulating type dual converter

7. Choose the correct statement.

a) Circulating current type is faster in operation

b) Non-circulating current type is faster in operation

c) Both the types have the same speed of operation

d) Circulating current improves power factor

8. Circulating current flows

b) from one converter to another converter

c) in the whole circuit

d) none of the mentioned

9. The reactor in circulating current type dual converters

a) increases losses

b) reduces power factor

c) increase the weight of the circuit

10. If V1 and V2 are the instantaneous voltages of the two converter circuits in the dual convert, then the output voltage is

a) V1 + V2 b) (V1 + V2)/2 c) V1 – V2 d) 2(V1 + V2) View Answer

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Mohammed 5 day ago

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