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(b) Figure Q5(b) shows a rectifier circuit topology that is used for single-phase power factor co...
Question 4 (15 marks) Figure 4 shows a single-phase diode bridge rectifier supplied from the 230...
Question 4 (15 marks) Figure 4 shows a single-phase diode bridge rectifier supplied from the 230 V, 50 Hz mains via a step- down transformer D2 D SW + n: 1 + 230 V 33mF 20 0 Vo 50 Hz D3 D4 Figure 4 (a) Assuming that the switch SW is open, explain the operation of the rectifier in figure 4 with the aid of the waveforms of the input and output voltages (v, and v) [4 marks (b) With...
In this part of the term paper, design a single-phase switch-mode DC power supply with a forward ...
In this part of the term paper, design a single-phase switch-mode DC power supply with a forward converter. Provide answers to the questions below Please combine the single-phase full-wave rectifier from part two of your term paper with a forward converter to produce a switch-mode DC power supply, as shown below. The output of the bridge rectifier serves as input to the forward converter L1 Np: N BH621BH62 D, V1 Load C1 100p 45 Vrms D3 BH62 18H62 D4 Control...
b. Consider the single-phase fully controlled of thyristor bridge rectifier supplies a load consists of R-L...
b. Consider the single-phase fully controlled of thyristor bridge rectifier supplies a load consists of R-L load and Vee in series as shown in Figure Q2 (b). The parameters for this circuit are as follows: supply voltage is 120 Vrms at 60 Hz, DC voltage, Voe equal to 10 v. i. Sketch the waveforms for output voltage, thyristor current, diode current and output current (CO2: PO2 - 5 marks) Calculate the output voltage, Va at a = Tt/2. (CO2: PO2...
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...
(a) Explain physically how ap-n junction functions as a rectifier diode. (5 marks) Figure Q5(b) shows...
(a) Explain physically how ap-n junction functions as a rectifier diode. (5 marks) Figure Q5(b) shows a Voltage divider bias circuit for a BJT. Given that; Vcc 18 V, BDC (b) 120. 18 V 3.3 kQ C2 39.0 kO 10 μF C1 B 120 10 μΕ 1.0 kQ 8.2 kQ Figure Q5(b) Voltage divider bias configuration of BJT Calculate Ic and VCE using exact method. (i) (5 marks) Repeat the calculation of Ic and VCE using approximate method. (ii) (3...
Figure 3 shows a simplified schematic of a single phase equivalent circuit diagram of inverter coupled...
Figure 3 shows a simplified schematic of a single phase equivalent circuit diagram of inverter coupled embedded generation, where Vinv is the voltage at the inverter connection point (assume this to be 240VZ0°) Vpcc is the voltage at the point of common coupling Vgnd is the grid voltage X the reactance in the inverter connection (3.6 m) R the resistance in the inverter connection (55 mO) Xgrid is the reactance of the distribution grid (200 m) Rend is the resistance...
2. Figure 2 shows a 6-pulse thyristor rectifier feeding a DC static load an operating at steady-state. The ac input power supply is a symmetric set of three-phase voltages forming a direct seque...
2. Figure 2 shows a 6-pulse thyristor rectifier feeding a DC static load an operating at steady-state. The ac input power supply is a symmetric set of three-phase voltages forming a direct sequence, having rms line-to-line voltage of Vuns equal to 415 V and angular frequency ω equal to 100π rad/s. The load is sufficiently inductive to smooth out the load current i(t), i.e. i 1, where I is a constant. a. Derive the mathematical expression of the average DC...
Circuit Analysis Zo Is Zi ALi If FIGURE Q3(b) negative feedback network (b) Figure Q3(b) shows...
Circuit Analysis
Zo Is Zi ALi If FIGURE Q3(b) negative feedback network (b) Figure Q3(b) shows an amplifier with a Given Zof 100 kQ, Zo = 10 kQ and A 50 State the feedback topology and the amplifier type (i) (2 marks) (ii) Calculate the gain without feedback, A and the feedback factor, B. (6 marks) (iii) If the low cutoff frequency of the amplifier with feedback network (fL) is 300 Hz, calculate the low cutoff frequency (fi) if the...
A Single-phase halfwave controlled rectifier is used for a heating system whose rated power is 15kW at 220V. The SCR is connected to a 220 VAC system. 1. Determine the rated equivalent resistance of the heater 2. Determine the maximum that the rectifie
A Single-phase halfwave controlled rectifier is used for a heating system whose rated power is 15kW at 220V. The SCR is connected to a 220 VAC system. 1. Determine the rated equivalent resistance of the heater2. Determine the maximum that the rectifier can provide to the heater3. When the SCR is fired at angle of p/3, determinea. Waveform of the voltages across the load, the SCRb. Waveform of the currents flow through the SCR, drawn by the load and supplied...
a) Discuss the main role of per-unit systems. (CO3:P01 - 3 marks) b) A single phase...
a) Discuss the main role of per-unit systems. (CO3:P01 - 3 marks) b) A single phase two winding transformer rated at 20 kVA, 415/230 volts 50 Hz is subjected to open and short circuit test. Table Q3 (a) summarize the results of the test; Table Q3 (a) Open Circuit Test 12 = 12 A P2 = 200 W Short Circuit Test V1 = 35 V P1 = 300 W I. Based on the short circuit test, determine the equivalent series...
Question 4 (15 marks) Figure 4 shows a single-phase diode bridge rectifier supplied from the 230 V, 50 Hz mains via a step- down transformer D2 D SW + n: 1 + 230 V 33mF 20 0 Vo 50 Hz D3 D4 Figure 4 (a) Assuming that the switch SW is open, explain the operation of the rectifier in figure 4 with the aid of the waveforms of the input and output voltages (v, and v) [4 marks (b) With...
In this part of the term paper, design a single-phase switch-mode DC power supply with a forward converter. Provide answers to the questions below Please combine the single-phase full-wave rectifier from part two of your term paper with a forward converter to produce a switch-mode DC power supply, as shown below. The output of the bridge rectifier serves as input to the forward converter L1 Np: N BH621BH62 D, V1 Load C1 100p 45 Vrms D3 BH62 18H62 D4 Control...
b. Consider the single-phase fully controlled of thyristor bridge rectifier supplies a load consists of R-L load and Vee in series as shown in Figure Q2 (b). The parameters for this circuit are as follows: supply voltage is 120 Vrms at 60 Hz, DC voltage, Voe equal to 10 v. i. Sketch the waveforms for output voltage, thyristor current, diode current and output current (CO2: PO2 - 5 marks) Calculate the output voltage, Va at a = Tt/2. (CO2: PO2...
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...
(a) Explain physically how ap-n junction functions as a rectifier diode. (5 marks) Figure Q5(b) shows a Voltage divider bias circuit for a BJT. Given that; Vcc 18 V, BDC (b) 120. 18 V 3.3 kQ C2 39.0 kO 10 μF C1 B 120 10 μΕ 1.0 kQ 8.2 kQ Figure Q5(b) Voltage divider bias configuration of BJT Calculate Ic and VCE using exact method. (i) (5 marks) Repeat the calculation of Ic and VCE using approximate method. (ii) (3...
Figure 3 shows a simplified schematic of a single phase equivalent circuit diagram of inverter coupled embedded generation, where Vinv is the voltage at the inverter connection point (assume this to be 240VZ0°) Vpcc is the voltage at the point of common coupling Vgnd is the grid voltage X the reactance in the inverter connection (3.6 m) R the resistance in the inverter connection (55 mO) Xgrid is the reactance of the distribution grid (200 m) Rend is the resistance...
2. Figure 2 shows a 6-pulse thyristor rectifier feeding a DC static load an operating at steady-state. The ac input power supply is a symmetric set of three-phase voltages forming a direct sequence, having rms line-to-line voltage of Vuns equal to 415 V and angular frequency ω equal to 100π rad/s. The load is sufficiently inductive to smooth out the load current i(t), i.e. i 1, where I is a constant. a. Derive the mathematical expression of the average DC...
Circuit Analysis
Zo Is Zi ALi If FIGURE Q3(b) negative feedback network (b) Figure Q3(b) shows an amplifier with a Given Zof 100 kQ, Zo = 10 kQ and A 50 State the feedback topology and the amplifier type (i) (2 marks) (ii) Calculate the gain without feedback, A and the feedback factor, B. (6 marks) (iii) If the low cutoff frequency of the amplifier with feedback network (fL) is 300 Hz, calculate the low cutoff frequency (fi) if the...
a) Discuss the main role of per-unit systems. (CO3:P01 - 3 marks) b) A single phase two winding transformer rated at 20 kVA, 415/230 volts 50 Hz is subjected to open and short circuit test. Table Q3 (a) summarize the results of the test; Table Q3 (a) Open Circuit Test 12 = 12 A P2 = 200 W Short Circuit Test V1 = 35 V P1 = 300 W I. Based on the short circuit test, determine the equivalent series...
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