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Problem 1 [Maximum Possible Points 34) A power controller is used supply the required power to...
Single phase square to supply an ac load from dc power supply with source voltage VS = 20 volts wave full bridge inverter will be designed. The load resistance is R = 24 ohms and L = 240 milliHenry. Exit the frequency of its voltage will be 25 Hz. With the minimum value of the load current at t = 12ms and t = 30ms Calculate the values.
I. The ac voltage controller in Figure 1 uses on-off control for heating a resistive load of R-4Ω and the input voltage is Vs-208V(rms),60Hz. If the desired output power is Po=3kW, determine (a) the duty cycle D, and (b) the input power factor Triac vin ) Figure 1
NAME IIl. (34 pts).) The circuit below is a power amplifier. It should provide a power output of 12 Watts to an 8 Ohm load. The input resistance of the power amp (as seen by the signal source Vs) should be 20k Ohms. The maximum value of the signal source Vs is 0.5v rms Determine (a) The minimum values of the power supply voltages needed (+Vcc and-Vcc), (b) The values of resistors R1 and R2, (c) The minimum slew rate...
Variable frequency electronic generation of sinusoids first requires the grid AC to be rectified into DC. Next the DC is converted to high f AC by an inverter circuit. The entire process is at 95% efficiency. Below you are required to refresh your understanding of AC to DC rectifiers. Diode rectifiers are non-linear loads so grid power factor and harmonic generation are again a consideration. The total power factor is composed of two parts: the distortion power factor due to...
1 Determine an equation for the efficiency (power out/power in) of a four diode bridge AC rectifier circuit. Approximate the load as one large resistor and do not assume the diode resistance is negligible. Make sure to solve the equation so only known quantities (load resistance, source voltage, ect) and not unknown quantities (currents ect) appear in it. 2. Modify your equation to include a capacitor in parallel with the load that will smooth out the resultant DC voltage and...
It is required to use a FULL-wave rectifier to design a dc power supply that provides an average dc output voltage of 15 V. A maximum ripple voltage of ±1 V is allowed on the output voltage. The output voltage will feed a load resistance of 250 Ω. Assume a sinusoidal input voltage with the frequency of 60 Hz. Do not include a Zener diode in your design. (Assume V_D0)* = 0.7 V). a) Draw the circuit diagram. b) Calculate...
Problem 1: The secondary winding of a transformer has a terminal voltage of v, (t) 282.8 sin 377t V. The turns ratio of the transformer is 100:200 (a0.50) The impedances of this transformer referred to the primary side are The equivalent circuit is shown below lf (a) If the secondary current of the transformer is i,()-7.07sin(3771-36.87) A, what is the primary current of this transformer? (20 points) HINTS: I. Peak values of the secondary voltage and current are specified in...
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...
Problem 2 A 1.5 volt energy source is to used to power a 5 volt, 1 amp load. A buck-boost converter is used for this application. A suitable transistor is found with an on-resistance of 35 mQ, and a Schottky diode is found with a forward drop of 0.5 volts. The on resistance of the Schottky diode may be ignored. The circuit is shown in the following figure. 1 A 100 HH 5 V Load 1.5 V DT T f,...
Problem 2 A separately excited DC motor is characterized by the followng intormation Armature resistance Ra-5 2 armature inductance La . very large, Field resistance RS200 Ω, ted voltage Vt 200 V, and an inertia constant J-12 kg m Neglecting friction losses and assuming no-saturation in the machine magnetic core system, answer the folowing questions: Part 1: (6 marks) he motor a as shown in figure 2a. The motor drives a constant power load of vaue 1 40375 hp (ie...