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speed control of dc shunt motor vdc the output of rectifying circuit which is applied to the motor field as shown in figure for
speed control of dc series motora half wave circuit for the speed control of dc series motor is shown in figure and
speed control using phase controlled converters phase controlled converters converts a constant ac voltage into variable
speed control of dc motor the dc motor are versatile motors among the available electrical motors due to their
fields winding it produces the working flux this is also called exciting
dc motor the motor which require dc supply to drive them are called dc motors dc motor consist two types of windingsafields
normal 0 false false false en-in x-none x-none motor control
normal 0 false false false en-in x-none x-none high frequency electronic ballast
normal 0 false false false en-in x-none x-none life interactive ups systems
off line ups systemagain the two switches are used in this type of ups as online ups the difference is that here the
on line ups systemsin this ups there are two switches one is main static switch and another is ups static switch in
uninterruptable power supply an uninterruptible power supply provides emergency power when utility power is not available
mode1when the positive pulse from pwm is applied to the transistor q shown in figure it gets turned on in this
buck boost converter the output of buck boost regulator may be less than or greater than the input voltage since the
mode 2 in this mode transistor gets turned off by the negative output of pwm current flows through inductance l diode
mode 1 in this mode transistor q gets turned on by the positive output of the pwm after that current flows through inductor
boost converter the boost converter has its output voltage always greater than input voltage like a buck converter
mode 1 0 lttlt t1 by applying a positive output pulse of the pulse width modulator to the transistor q1 it gets turned
buck converterin buck converters the output voltage is always less than the input voltage the basic circuit of buck
fly back converterin fly back converter an inductor is used is primary winding of transformerinductor stores the energy
switched mode power supply smpsswitching mode power supply converts an unregulated dc voltage to a regulated dc output voltage
two quadrant type a chopper or class c chopper or reversible chopper the quadrant type a chopper is also known as reversible
second quadrant or class b chopperclass b chopper is shown in figure in this type of chopper load must contain a dc source e
chopper configuration chopper are classified in five different classes according to their operating capability in particular quadrant
step up chopper in this chopper average output voltage is greater than input voltage the circuit different mode of