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| Amplification is the control of a larger output quantity by the variation of a smaller input quantity. Such amplification can be performed by amagnetic device called magnetic amplifier or Magamp. This set up is designed to study the basic characteristics of such amplifier. The set up consists magnetic amplifier, ac and dc power supply, two meters for load and controlcurrents and a fixed value RL. |
| This set up is designed to study of speed control(in open & close loop) of DC motor using SCRphase control system. It has inbuilt trigger source, SCR phase control circuit, P & PI controller. A fractionHP dc motor coupled with a small permanent magnetDC motor as tacho generator and an ac inductionmotor is used to impose load upon the dc motor tofound characteristics of controller |
| In ac circuits the phase controlledrectifier can be turned on at any anglewith respect to the applied voltagepolarity. The angle a is oftenly calledthe firing angle. These circuits arecharacterized as controlled rectifiers orconverters. In present model study ofsuch controlled rectifier in bridgeconfiguration is performed.The primeaim of firing circuit to produce triggerpulses to the thyristors at different firingangles. |
In ac circuits the phase controlled
rectifier can be turned on at any angle a
with respect to the applied voltage
polarity. The angle a is oftenly called
the firing angle. These circuits are
characterized as controlled rectifiers or
converters. In present model study of
such controlled rectifier in bridge
configuration is performed.The prime
aim of firing circuit to produce trigger
pulses to the thyristors at different firing
angles.
A flip - flop is a bistable circuit inwhich the one's
output remain in stable state till the complement
stage is triggered to change the state. A bistable
is also called the latch. The commonSCRis a good
latch device and useful to make bistables.
| In ac circuits the phase controlled rectifiercan be turned on at any angle a with respectto the applied voltage polarity. The angle a isoftenly called the firing angle. These circuitsare characterized as controlled rectifiers orconverters. In present model study of suchcontrolled rectifier in bridge configuration isperformed. |
The low voltage ac voltage ( S1 of T ) is applied
to the pair of two SCRs, CR1 and CR2,
connected antiparallel with in series RL. These
are the main SCRs. As the SCR is being
commutated at the crossover points of ac cycle,
but then it becomes a simple phase control circuit.
To commutate them earlier at required time two
auxiliary SCRs, CR3 and CR4 are used.
The control of dc power in a load is carried out
by two means, either by regulating it through a
series resistance ( it may be in form of passive
or an active device ) or by mean of pulsating
currents such as chopper. The advantage of
chopper upon series components is small
loss of power through it. hence small loss of
controlled amount and lesser dissipation in it (
in form of heat ). The provided chopper is
SCR Morgan chopper in which an active
device is made ON by trigger pulse and OFF
by commutation current.
