Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Four Quadrant Chopper or Class E chopper
Figure class E chopper circuit
Mode I
When SW1 is ON with SW4 V0 = Vs and load current flows as shown in figure when SW1 is OFF V0 = 0 but current will continuously be flowing through SW$ and diode D2. Here both V0 and I0 will be positive hence it is first quadrant operation as shown in figure.
Mode II
When SW2 is ON with diode D4 V0= 0 but the direction of current will be negative. When SW2 is OFF diode D1 and D4 will be conducting in this period power flows from load to source because V0 = E+ L di/dt exceeds Vs. Hence Vo is positive but current is negative. This give the second quadrant operation as show in figure.
Mode III
In this mode the polarity off must be reverses so that third quadrant operation can be obtained. Now when SW2 is ON with SW2 , V0 = -Vs and current will be flowing in reverse direction. Both Vo and Io will be negative. When SW3 is OFF D2 will conduct with SW2 therefore both V0 and Io will be negative. Hence third quadrant operation is obtained.
Mode IV
Diode D2 must be conducting with SW4 On E have opposite polarity to that shown in figure now the voltage V0= 0 whenSW4 is ON and current 10 will be positive when SW4 is OFF V0 will be negative but current remains in same direction. In this condition power flows from load to source and V0 = -( E+ L di/dt) exceeds Vs.
Factors Affecting Choice of Observation: Observers are influenced by a number of factors in the process of observation. Black and champion have identified three such factors.
Explain Intrinsic Semiconductor. Intrinsic Semiconductor: An extremely pure semiconductor is termed as intrinsic semiconductor. But at absolute zero temperature its valence b
emf equation
Merits and Demerits of Stepper Motor Followings are the merits and demerits of stepper motors. Merits : a.They are compatible with digital systems b.For the co
Q. Draw the circuit of a two stage RC coupled amplifier?
Why dummy coils are used in generators
Binary Coded Decimal to Decimal Conversions • Step1. Break up the Binary Coded Decimal number into 4 bit binary number, starting from the least significant binary bit. • Step2
Consider the circuit shown in Figure with R 0 , (b) the quality factor Q, and (c) the maximum impedance Z m . Comment on the applicability of the universal resonance curve.
Q. A 60-Hz, six-pole, wye-connected, three-phase induction motor, with the parameters R 1 = R 2 = 0.025 and Xl 1 = Xl 2 = 0.125 , is controlled by variable-frequency control
Q. Show the Overall output limitations of Speed Control? The overall output limitations are as shown in Figure. With base speed defined as the full-field speed of themotor at t
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +1-415-670-9521
Phone: +1-415-670-9521
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd