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Question 4: Repeat question 3 if the motor is rotating in the reverse direction, with the...
2.9 To reduce the switching harmonics present in the input current of a certain buck converter,...
2.9 To reduce the switching harmonics present in the input current of a certain buck converter, an input filter consisting of inductor Li and capacitor Ci is added as shown in Fig. 2.32. Such filters are commonly used to meet regulations limiting conducted electromagnetic interference (EMI). For this problem, you may assume that all inductance and capacitance values are sufficiently large, such that all ripple magni- tudes are small CI Fig. 2.32 Addition of L-C input filter to buck converter,...
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1. Analysis and design of a buck-boost converter: A buck-boost converter is illustrated in Fig. 1(a),
and a practical implementation using a transistor and diode is shown in Fig. 1(b).
+
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Figure 1 Buck–boost converter
of Problem 1: (a) ideal converter
circuit, (b) implementation using
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power Electronics. Please help Problem 4: (30 points) rect d(r) In the PFC converter shown above,...
power Electronics. Please help
Problem 4: (30 points) rect d(r) In the PFC converter shown above, the DC value of the output voltage is to be regulated at 200 v and the input ac voltage is vs _ 170 sin(2π 60t) V . The output power is 1 kw. Assume steady-state operation and a switching frequency of 200 kHz. (a) Calculate the inductance needed to limit the maximum peak-peak switching frequency ripple in inductor current to 1.2 A. (b) Calculate...
power electronics and divices In one application, a 12V battery is to be used to power up six power LEDs connected a...
power electronics and divices
In one application, a 12V battery is to be used to power up six power LEDs connected as shown in Figure 3. The LED parameter is given Table 1. Using the rated parameters as the basis calculation, design a suitable DC-DC converter for this application whereby the inductor current variation must not exceed 50% of the output current whereas the output voltage ripple must be less than 5%. The system uses 200 kHz switching frequency Vo...
a9a resistive load. Inductor 3-(35 pts) Design a converter that has an input voltage of 24 V DC and supplies 18 V DC to current is desired to be continuous and must not change more than 30 % of i...
a9a resistive load. Inductor 3-(35 pts) Design a converter that has an input voltage of 24 V DC and supplies 18 V DC to current is desired to be continuous and must not change more than 30 % of its average value voltage ripple must be lower than 2 %. Switching frequency is 10 kHz. a) Draw the circuit diagram. Calculate the duty ratio. Calculate values for 2 desired conditions of the inductor current and determine the value of the...
A buck converter is used to have low output voltage from the high input source to...
A buck converter is used to have low output voltage from the high input source to low output voltage. The estimated power output is at 25 kW with the switching frequency of 25 kHz. Design the buck converter as by finding and following specifications consider the ripple of the output is set at 1% (i) Calculate the duty ratio of the buck converter (1 mark) (ii) Determine the minimum requirement for the inductor and the capacitor (5 marks) (iii) Determine...
Question 1 (25 marks) a) A full wave rectifier has 40V peak secondary voltage, 2,000uF capacitor...
Question 1 (25 marks) a) A full wave rectifier has 40V peak secondary voltage, 2,000uF capacitor and 1022 load. You may take the line frequency as 50Hz and voltage drop across a diode as 0.7V. i. Calculate the peak dc voltage (VA). (2 marks) ii. Calculate the dc load voltage (Vdcloed). (4 marks) iii. Calculate the ripple voltage (AVLoad). (4 marks) b) The capacitance, inductance and load resistance of a Buck step-down dc-to-dc converter are 1.0uF, 10uH and 20.022 respectively....
4. A 3-phase full-wave converter drive is feeding power to a 220 V, 20 A, 1000...
4. A 3-phase full-wave converter drive is feeding power to a 220 V, 20 A, 1000 rpm separately excited dc motor. The ac input to the converters are 415 V, 3-phase, 50 Hz, Y-connected supply system. The field is also controlled by a 3-phase full converter and is set to the maximum possible value. The armature resistance is 0.5 Q and the field resistance is 250 12. The motor voltage constant is 1.2 V/A rad/s. Assume continuous conduction and ripple...
3. A controlled single-phase fiull-wave controlled rectifier is connected in a de motor drive in Figure...
3. A controlled single-phase fiull-wave controlled rectifier is connected in a de motor drive in Figure 4. The de motor armature inductance can be assumed large enough such that any motor curent ripple is negligible. (a) Assuming negligible supply reactance, show that the average rectifier output voltage V, in tems of the supply ms voltage E and the firing angle a, is given by 2/2E (6 marks) cos a _ (b) Given that the supply voltage is 230V, 50HZ and...
Problem 3: (20 points) Design a suitable power converter (only the power stage) for the following...
Problem 3: (20 points) Design a suitable power converter (only the power stage) for the following specifications Input voltage: 36 V to 72 V; required output voltage: 48 V regulated; load current: 2 A to 10 A Maximum allowable pk-pk output ripple voltage: 0.5 V; maximum allowable pk-pk ripple in any inductor current: 2 A. Assume a switching frequency of 200 kHz. Show a complete schematic and the following details in your answer. L: Minimum L value C: Minimum C...
2.9 To reduce the switching harmonics present in the input current of a certain buck converter, an input filter consisting of inductor Li and capacitor Ci is added as shown in Fig. 2.32. Such filters are commonly used to meet regulations limiting conducted electromagnetic interference (EMI). For this problem, you may assume that all inductance and capacitance values are sufficiently large, such that all ripple magni- tudes are small CI Fig. 2.32 Addition of L-C input filter to buck converter,...
power Electronics. Please help
Problem 4: (30 points) rect d(r) In the PFC converter shown above, the DC value of the output voltage is to be regulated at 200 v and the input ac voltage is vs _ 170 sin(2π 60t) V . The output power is 1 kw. Assume steady-state operation and a switching frequency of 200 kHz. (a) Calculate the inductance needed to limit the maximum peak-peak switching frequency ripple in inductor current to 1.2 A. (b) Calculate...
power electronics and divices
In one application, a 12V battery is to be used to power up six power LEDs connected as shown in Figure 3. The LED parameter is given Table 1. Using the rated parameters as the basis calculation, design a suitable DC-DC converter for this application whereby the inductor current variation must not exceed 50% of the output current whereas the output voltage ripple must be less than 5%. The system uses 200 kHz switching frequency Vo...
a9a resistive load. Inductor 3-(35 pts) Design a converter that has an input voltage of 24 V DC and supplies 18 V DC to current is desired to be continuous and must not change more than 30 % of its average value voltage ripple must be lower than 2 %. Switching frequency is 10 kHz. a) Draw the circuit diagram. Calculate the duty ratio. Calculate values for 2 desired conditions of the inductor current and determine the value of the...
A buck converter is used to have low output voltage from the high input source to low output voltage. The estimated power output is at 25 kW with the switching frequency of 25 kHz. Design the buck converter as by finding and following specifications consider the ripple of the output is set at 1% (i) Calculate the duty ratio of the buck converter (1 mark) (ii) Determine the minimum requirement for the inductor and the capacitor (5 marks) (iii) Determine...
Question 1 (25 marks) a) A full wave rectifier has 40V peak secondary voltage, 2,000uF capacitor and 1022 load. You may take the line frequency as 50Hz and voltage drop across a diode as 0.7V. i. Calculate the peak dc voltage (VA). (2 marks) ii. Calculate the dc load voltage (Vdcloed). (4 marks) iii. Calculate the ripple voltage (AVLoad). (4 marks) b) The capacitance, inductance and load resistance of a Buck step-down dc-to-dc converter are 1.0uF, 10uH and 20.022 respectively....
4. A 3-phase full-wave converter drive is feeding power to a 220 V, 20 A, 1000 rpm separately excited dc motor. The ac input to the converters are 415 V, 3-phase, 50 Hz, Y-connected supply system. The field is also controlled by a 3-phase full converter and is set to the maximum possible value. The armature resistance is 0.5 Q and the field resistance is 250 12. The motor voltage constant is 1.2 V/A rad/s. Assume continuous conduction and ripple...
3. A controlled single-phase fiull-wave controlled rectifier is connected in a de motor drive in Figure 4. The de motor armature inductance can be assumed large enough such that any motor curent ripple is negligible. (a) Assuming negligible supply reactance, show that the average rectifier output voltage V, in tems of the supply ms voltage E and the firing angle a, is given by 2/2E (6 marks) cos a _ (b) Given that the supply voltage is 230V, 50HZ and...
Problem 3: (20 points) Design a suitable power converter (only the power stage) for the following specifications Input voltage: 36 V to 72 V; required output voltage: 48 V regulated; load current: 2 A to 10 A Maximum allowable pk-pk output ripple voltage: 0.5 V; maximum allowable pk-pk ripple in any inductor current: 2 A. Assume a switching frequency of 200 kHz. Show a complete schematic and the following details in your answer. L: Minimum L value C: Minimum C...
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