What is a Direct Radiator Loudspeaker?
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Q: What is a Direct Radiator Loudspeaker?
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Topic : Analogous Circuits for Direct Radiator Loudspeaker
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- Análisis de rectificador onda completa Consider the capacitor-filter rectifier circuit as shown in Figure 1. The input is a single-phase source that is derived from a 220 Vrms mains. Tasks for analysis: (a) Rig up the circuit as shown in Figure land plot V andi versus time. (b) Why is there ringing on the current wave-form? (c) What is the series impedance of the circuitệ (d) Plot V and V. versus time. What is the ripple? How does ripple depend on load, capacitor C; and frequency of input wave-form? (e) Measure the current and voltage waveform across the rectifier diode. (f) Estimate the average and ms currents through the rectifier diode, Calculate the diode power dissipation. (g) What should be the peak current rating of the diode? (h) Change the initial charge voltage on the capacitor Cr. What is the effect on the input surge current? (i) Change the phase angle of the input V, at start up. Observe the effect on current i. What happens and why? 1) Under whaf conditions do you get…1. The DC-DC converter has several circuit configurations. a) (Draw a simple connection of IGBT switch, diode and inductor that can discriminate between Buck, Boost and Buck-Boost converter circuits respectively.) b) ('A Boost converter produces an output voltage, Vo that is more than or equal to the input voltage, Vi. Based on this statement develop the equation for the relationship between Vo Viand D. where D represents the duty ratio. You can use any suitable diagram to illustrate your answer.)2. Given the circuit a. State how each switch can be realized using transistors and/or diodes, and whether the realization requires single-quadrant, current/voltage bi-directional two quadrant switch or four quadrant switches then redraw the circuit. b. Solve the converter to determine the inductor currents, capacitor voltages and conversion ratio. Ignore all losses.
- QUESTION 1 Design a high efficiency 3.3 V, 5A d.c.to d.c. power converter from a 4 to 5.5 Vdc source. The maximum allowable inductor current ripple and output voltage ripple are 0.1A and 20 mV, respectively. Assume a switching frequency of 20 kHz. a) Design a suitable converter power circuit using a MOSFET switch, showing all calculation of inductor and capacitor values and drawing a circuit diagram of the final design including component values. Indicate the peak inverse voltage and forward current rating of any diode required, and the maximum drain- source voltage of the MOSFET. b) On the Schematic diagram, draw the path of the current flow during the ON time and the OFF time. c) Describe the effect of changing the values of the inductor and the capacitor in the circuit. d) What is the effect of switching frequency in the circuit? e) Draw the schematic diagram of a circuit with the output voltage higher than the input voltage.Design a voltage regulator circuit to supply a constant voltage of (10 V) across a resistive load of (10 ). The minimum Zener current is (50 mA) and maximum current is (800 mA). AssumeRs=10 andFind:- 1- the maximum and minimum source voltage. 2- at the maximum source voltage, find the minimum load resistance. 3- at the minimum source voltage, find the maximum load resistance. 4- minimum and maximum power dissipated in the Zener diode.Suppose a power supply is energized by an AC source of 119 V RMS. The transformer step-down ratio is 8:1, it uses a full-wave bridge rectifier circuit with silicon diodes, and the filter is nothing but a single electrolytic capacitor. Calculate the unloaded DC output voltage for this supply (assume 0.7 volts drop across each diode). Also, write an equation solving for DC output voltage (Vout), given all these parameters.
- a) Given the choice between a MOSFE Open with for a high voltage application. State your selection with reasons. b) The parameters for the power MOSFET in the circuit shown in the Figure 1 are as follows: rise time, t₁ =2 µs; on resistance, Ros(on) = 0.202; duty cycle, D = 0.7; and switching frequency, f = 30 kHz. Determine: i. the power-loss in the on state. ii. the power-loss during the turn-on interval. Vos 100 V ID D S R₁ = 120 Figure 1 c) Draw a clearly labeled diagram of the thermal equivalent circuit of a transistor. d) The maximum junction temperature of a power transistor is T; = 150 °C and the ambient temperature is T₁ = 25 °C. If the thermal impedances are Rjc = 0.4 C/W, Rcs=0.1 °C/W, and RSA = 0.5 °C/W. Calculate, i. the maximum power dissipation. ii. the case temperature.A single phase, fully controlled bridge rectifier supplies a series connected resistor- inductor load (R = 20, L = 0.02H) from 220V, 50HZ AC supply. The triggering angle of the thyristors is 60°. (Assume the circuit is ideal.) a. Sketch the circuit. b. Develop the load current expression and check the continuity of the load current. c. Sketch the load voltage and load current waveforms. d. Calculate the mean values of the load voltage and load current. e. Sketch the inductor voltage and calculate its mean value. f. Calculate the FF (form factor) and RF (ripple factor) of the load voltage.QUESTION 4 In this voltage divider bias circuit, the input is at the base. Output is at the emitter with a high input resistance and low output resistance. The maximum voltage gain is 1 and the coupling capacitors must have a negligible reactance at the frequency of operation. (use to answer a and b) a. Derive the expression for the voltage gain, current gain, and power gain in terms of power delivered to the load, RL. b. Sketch both the DC and AC equivalent circuits. c. Derive the expression for ripple factor of Half Wave Rectification with a capacitor filter.
- What is the maximum dc voltage you could expect to obtain from a transformer with an 18 Vrms secondary using a bridge rectifier circuit with a filter capacitor? in your own wordsIn this voltage divider bias circuit, the input is at the base. Output is at the emitter with a high input resistance and low output resistance. The maximum voltage gain is 1 and the coupling capacitors must have a negligible reactance at the frequency of operation. (use to answer a and b) a. Derive the expression for the voltage gain, current gain, and power gain in terms of power delivered to the load, R. b. Sketch both the DC and AC equivalent circuits. c. Derive the expression for ripple factor of Half Wave Rectification with a capacitor filter.Create a schematic diagram for building an AC-DC power supply that uses a complete bridge rectifier, filter capacitors, and regulators and has a selectable output voltage. Keep in mind: When a load is attached, the power supply must be able to deliver at least 500mA of output current.