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A d.c. source is switched in steps to synthesize the three-phase output. The basic three-phase bridge inverter can be controlled. The angle through which each switch conducts and at any instant the number of switches conducting simultaneously are, respectively
- a)120° and 02
- b)120° and 03
- c)180° and 02
- d)180° and 04
Correct answer is option 'B'. Can you explain this answer?
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A d.c. source is switched in steps to synthesize the three-phase outpu...
Explanation:
Step 1: Introduction
In this question, we are given that a d.c. source is switched in steps to synthesize the three-phase output. The basic three-phase bridge inverter can be controlled. We need to determine the angle through which each switch conducts and at any instant the number of switches conducting simultaneously.
Step 2: Basic Three-Phase Bridge Inverter
The basic three-phase bridge inverter consists of six switches. The switches are connected in the form of a bridge. The switches can be turned on and off using a control signal. The input to the bridge is a d.c. voltage. The output of the bridge is a three-phase voltage. The three-phase voltage is a sequence of positive and negative voltages. The positive and negative voltages are generated by turning on and off the switches in a specific sequence.
Step 3: Switching Sequence
The switching sequence for the three-phase bridge inverter is given below:
- In the first step, switches S1 and S4 are turned on. The voltage across the load is positive.
- In the second step, switches S2 and S5 are turned on. The voltage across the load is zero.
- In the third step, switches S3 and S6 are turned on. The voltage across the load is negative.
- In the fourth step, the sequence is repeated.
Step 4: Angle through which each switch conducts
The angle through which each switch conducts depends on the frequency of the input voltage. If the frequency of the input voltage is f, then the angle through which each switch conducts is given by:
- S1 and S4 conduct for (360/f) * (1/6) = 60/f degrees
- S2 and S5 conduct for (360/f) * (1/2) = 180/f degrees
- S3 and S6 conduct for (360/f) * (5/6) = 300/f degrees
Step 5: Number of switches conducting simultaneously
At any instant, the number of switches conducting simultaneously depends on the switching sequence. In the first step, two switches conduct simultaneously. In the second step, three switches conduct simultaneously. In the third step, two switches conduct simultaneously. Therefore, the correct option is (b) 120 and 03.
Step 1: Introduction
In this question, we are given that a d.c. source is switched in steps to synthesize the three-phase output. The basic three-phase bridge inverter can be controlled. We need to determine the angle through which each switch conducts and at any instant the number of switches conducting simultaneously.
Step 2: Basic Three-Phase Bridge Inverter
The basic three-phase bridge inverter consists of six switches. The switches are connected in the form of a bridge. The switches can be turned on and off using a control signal. The input to the bridge is a d.c. voltage. The output of the bridge is a three-phase voltage. The three-phase voltage is a sequence of positive and negative voltages. The positive and negative voltages are generated by turning on and off the switches in a specific sequence.
Step 3: Switching Sequence
The switching sequence for the three-phase bridge inverter is given below:
- In the first step, switches S1 and S4 are turned on. The voltage across the load is positive.
- In the second step, switches S2 and S5 are turned on. The voltage across the load is zero.
- In the third step, switches S3 and S6 are turned on. The voltage across the load is negative.
- In the fourth step, the sequence is repeated.
Step 4: Angle through which each switch conducts
The angle through which each switch conducts depends on the frequency of the input voltage. If the frequency of the input voltage is f, then the angle through which each switch conducts is given by:
- S1 and S4 conduct for (360/f) * (1/6) = 60/f degrees
- S2 and S5 conduct for (360/f) * (1/2) = 180/f degrees
- S3 and S6 conduct for (360/f) * (5/6) = 300/f degrees
Step 5: Number of switches conducting simultaneously
At any instant, the number of switches conducting simultaneously depends on the switching sequence. In the first step, two switches conduct simultaneously. In the second step, three switches conduct simultaneously. In the third step, two switches conduct simultaneously. Therefore, the correct option is (b) 120 and 03.
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A d.c. source is switched in steps to synthesize the three-phase output. The basic three-phase bridge inverter can be controlled. The angle through which each switch conducts and at any instant the number of switches conducting simultaneously are, respectively a)120 and 02 b)120 and 03 c)180 and 02 d)180 and 04Correct answer is option 'B'. Can you explain this answer?
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