6 Three-phase, delta connected, 50Hz, bridge inverter for 180° mode 1 of conduction with a per phase-balanced load of (10+j5) ohms has a supply voltage of 400V. Find a. RMS value of per phase output voltage and current, and b. The total power absorbed by the load. c. Also draw the per phase voltage and current waveforms appropriately.

The following three phase inverter in Figure 1 below is supplied by a DC voltage of VDc = 1000V and connected to the star connection of resistive load, R=60n. The load frequency is 50HZ. Assume that three switches are conducted at each interval. State the sequence number of conducting transistor for each interval and illustrate the equivalent circuit connection of load for each interval. Based on the equivalent circuit connection of load, determine the value of line voltage VRy and value of phase voltage VRN. Provide your answers in Table 1. (C3,CLO1) Duration Switch VRN VyN VRY Mode 0°-60° 60°-120° 120°-180° 180°-240° 240°-300° 300°-360° Table 1

Q2 (a) A single-phase full-bridge square-wave voltage source inverter has R and L load of 25 n and 15 mH, respectively and the load is connected in parallel. The inverter output frequency is 50 Hz while the transistor switching scheme is complementary bipolar (i) Define the expression of the RMS output voltage at the fundamental frequency. (ii) If the fundamental output voltage is 240 Vrms, identify the required DC input voltage for the inverter. (iii) Calculate the instantaneous load current by considering until the 7th harmonics number. (iv) Sketch the harmonic spectrum for output current. 2

In motor control of train, IGBT control AC motor save more energy than GTO due to less switching loss. State THREE more reasons why IGBT use in motor control has many advantages over GTO. If one of the freewheeling diode in your single phase inverter in above settings has reverse recovery failure. Describe what would happen to the circuit.

Thanks for the help This is about the integrated fabrication process for microelectronic devices for a bipolar n-p-n transistor; . Please work out the fabrication process flow. In each step of fabrication process, please illustrate the cross-section of the structure and indicate the material of each layer, the patterning of each layer and the process used.

(i) Draw the circuit diagram of the single phase full wave controlled rectifier (RL load) with center-tapped transformer and compare its performance with uncontrolled rectifier operation. (ii) A single phase fully controlled bridge rectifier circuit has DC output voltage 165 V for an AC supply voltage of 230 V rms. Find the firing angle delay of the circuit for the following cases (a) Converter mode (b) Inverter mode Converter mode delay angle Inverter mode delay angle