What is meant by phase controlled rectifier?

What is meant by phase controlled rectifier?
by

1 Answer

Answer :

It converts fixed ac voltage into variable dc voltage.
by

Related questions

What is delay angle or what is firing angle of phase controlled rectifier?

Description : What is delay angle or what is firing angle of phase controlled rectifier?

Last Answer : The delay angle is the angle at which thyristors are triggered after zero crossing. After zero crossing of supply voltage, one pair of thyristors is forward biased. After delay angle(α) these SCRs are triggered.

What are the advantages of freewheeling diodes in a controlled in a controlled rectifier?

Description : What are the advantages of freewheeling diodes in a controlled in a controlled rectifier?

Last Answer : a. Input power factor is improved. b. Load current waveform is improved and thus the load performance is better.

What is the function of freewheeling diodes in controlled rectifier?

Description : What is the function of freewheeling diodes in controlled rectifier?

Last Answer : It serves two process. a. It prevents the output voltage from becoming negative. b. The load current is transferred from the main thyristors to the freewheeling diode, thereby allowing all of its thyristors to regain their blocking states.

Mention some of the applications of controlled rectifier.

Description : Mention some of the applications of controlled rectifier.

Last Answer : a. Steel rolling mills, printing press, textile mills and paper mills employing dc motor drives. b. DC traction c. Electro chemical and electro-metallurgical process d. Portable hand tool drives e. Magnet power supplies f. HVDC transmission system

What are the advantages of free wheeling diode in rectifier circuit?

Description : What are the advantages of free wheeling diode in rectifier circuit?

Last Answer : The input power factor is improved. It prevents the output voltage from becoming negative. Load current waveform is improved.

Why thyristor is considered as Charge controlled device?

Description : Why thyristor is considered as Charge controlled device?

Last Answer : During the triggering process of the thyristor from forward blocking state to forward conduction state through the gate signal, by applying the gate signal (voltage between gate and cathode) increases the ... By controlling the amount of charge we can control the turning on time of the scr.

Power BJT is a current controlled device. Why?

Description : Power BJT is a current controlled device. Why?

Last Answer : Because the output (collector) current can be controlled by base current.

Power MOSFET is a voltage controlled device. Why?

Description : Power MOSFET is a voltage controlled device. Why?

Last Answer : Because the output (drain) current can be controlled by gate-source voltage.

IGBT is a voltage controlled device. Why?

Description : IGBT is a voltage controlled device. Why?

Last Answer : Because the controlling parameter is gate-emitter voltage.

Name some of the voltage driven ( Voltage controlled) devices

Description : Name some of the voltage driven ( Voltage controlled) devices

Last Answer : IGBT, MCT, IGCT, SIT, MOSFET

Name some of the current controlled (current driven) devices…

Description : Name some of the current controlled (current driven) devices…

Last Answer : SCR, GTO, GTR , BJT

What is meant by negative converter group in a cycloconverter?

Description : What is meant by negative converter group in a cycloconverter?

Last Answer : The part of the cycloconverter circuit that permits the flow of current during negative half cycle of output current is called negative converter group.

What is meant by positive converter group in a cycloconverter?

Description : What is meant by positive converter group in a cycloconverter?

Last Answer : The part of the cycloconverter circuit that permits the flow of current during positive half cycle of output current is called positive converter group.

What is meant by step-down cyclo-converters?

Description : What is meant by step-down cyclo-converters?

Last Answer : In these converters, the output frequency is more than the supply frequency.

What is meant by step-up cyclo-converters?

Description : What is meant by step-up cyclo-converters?

Last Answer : In these converters, the output frequency is less than the supply frequency.

What is meant by cyclo-converter?

Description : What is meant by cyclo-converter?

Last Answer : It converts input power at one frequency to output power at another frequency with one-stage conversion. Cycloconverter is also known as frequency changer.

What is meant by sequence control of ac voltage regulators?

Description : What is meant by sequence control of ac voltage regulators?

Last Answer : It means that the stages of voltage controllers in parallel triggered in a proper sequence one after the other so as to obtain a variable output with low harmonic content.

What is meant by high frequency carrier gating?

Description : What is meant by high frequency carrier gating?

Last Answer : Thyristor is turned on by using a train of pulses from αto π. This type of signal is called as high frequency carrier gating.

What is meant by PWM control?

Description : What is meant by PWM control?

Last Answer : In this method, a fixed dc input voltage is given to the inverter and a controlled ac output voltage is obtained by adjusting the on and off periods of the inverter components. This is the most popular method of controlling the output voltage and this method is termed as PWM control.

What is meant by McMurray inverter?

Description : What is meant by McMurray inverter?

Last Answer : It is an impulse commutated inverter which relies on LC circuit and an auxiliary thyristor for commutation in the load circuit.

What is meant a parallel inverter?

Description : What is meant a parallel inverter?

Last Answer : An inverter in which the commutating elements are connected in parallel with the load is called a parallel inverter.

What is meant a series inverter?

Description : What is meant a series inverter?

Last Answer : An inverter in which the commutating elements are connected in series with the load is called a series inverter.

What is meant by inverter?

Description : What is meant by inverter?

Last Answer : A device that converts dc power into ac power at desired output voltage and frequency is called an inverter.

What is meant by load commutation?

Description : What is meant by load commutation?

Last Answer : In this process, the load current flowing through the thyristor either becomes zero or is transferred to another device from the conducting thyristor.

What is meant by current commutation?

Description : What is meant by current commutation?

Last Answer : In this process, a current pulse is made to flow in the reverse direction through the conducting thyristor and when the net thyristor current becomes zero, it is turned off.

What is meant by voltage commutation?

Description : What is meant by voltage commutation?

Last Answer : In this process, a charged capacitor momentarily reverse biases the conducting thyristor and turn it off.

What is meant by PWM control in dc chopper?

Description : What is meant by PWM control in dc chopper?

Last Answer : In this control method, the on time Ton is varied but chopping frequency is kept constant. The width of the pulse is varied and hence this type of control is known as PulseWidth Modulation (PWM).

What is meant by FM control in a dc chopper?

Description : What is meant by FM control in a dc chopper?

Last Answer : In frequency modulation control, the chopping frequency f (or the chopping period T) is varied. Here two controls are possible. a. On-time T onis kept constant b. Off period T offis kept constant.

What is meant by TRC?

Description : What is meant by TRC?

Last Answer : In TRC, the value of Ton/ T is varied in order to change the average output voltage.

What is meant by duty-cycle?

Description : What is meant by duty-cycle?

Last Answer : Duty cycle is defined as the ratio of the on time of the chopper to the total time period of the chopper. It is denoted by α.

What is meant by step-up and step-down chopper?

Description : What is meant by step-up and step-down chopper?

Last Answer : In a step- down chopper or Buck converter, the average output voltage is less than the input voltage. In a step- up chopper or Boost converter, the average output voltage is more than the input voltage.

What is meant by dc chopper?

Description : What is meant by dc chopper?

Last Answer : A dc chopper is a high speed static switch used to obtain variable dc voltage from a constant dc voltage.

What is meant by delay angle?

Description : What is meant by delay angle?

Last Answer : The delay angle is defined as the angle between the zero crossing of the input voltage and the instant the thyristor is fired.

What is meant by chopper?

Description : What is meant by chopper?

Last Answer : Chopper converts fixed dc voltage into variable dc voltage

What is meant by four quadrant operation?

Description : What is meant by four quadrant operation?

Last Answer : A motor operate in two modes-motoring and braking. In motoring, it converts electrical energy into mechanical energy, which supports its motion. In braking, it works as a generator converting ... the motion. Motor can provide motoring and braking operations for both forward and reverse directions.

What is meant by Electrical Drives?

Description : What is meant by Electrical Drives?

Last Answer : Answer: Systems employed for motion control are called as Drives and many employ any of the prime movers such as, diesel or petrol engines, gas or steam turbines, hydraulic motors and electric ... about the basics and every part of the electrical drive system and explain as detail as possible.

What is meant by slip power?

Description : What is meant by slip power?

Last Answer : The portion of air gap power, which is not converted into mechanical power, is called slip power. Slip power is nothing but multiplication of slip(s) and airgap power (Pag) Slip power = s. Pag

What is meant by rotor resistance control?

Description : What is meant by rotor resistance control?

Last Answer : In a slip ring induction motor, a variable resistances are connected in the rotor circuit. By controlling the rotor resistance, the motor speed can be controlled as well as increase the ... and reduce the starting current. This method of speed control is called rotor resistance control method.

What is meant by plugging?

Description : What is meant by plugging?

Last Answer : It is one method of braking of induction motor. When phase sequence of supply of the motor running at a speed is reversed, by interchanging connections of any two phases of stator with respect to supply terminals, operations shifts from motoring to plugging region.

What is meant by dynamic braking?

Description : What is meant by dynamic braking?

Last Answer : Dynamic braking of electric motors occurs when the energy stored in the rotating mass is dissipated in an electrical resistance. This requires the motor to operate as a generator to convert this stored energy into electrical.

What is meant by stator current control?

Description : What is meant by stator current control?

Last Answer : The three-phase induction motor speed can be controlled by stator current control. The stator current can be varied by using current source inverter.

What is meant by V/F control?

Description : What is meant by V/F control?

Last Answer : When the frequency is reduced, the input voltage must be reduced proportionally so as to maintain constant flux. Otherwise the core will get saturated resulting in excessive iron loss and magnetizing current. This type of induction motor behaviour is similar to the working of dc series motors.

What is meant by PMDC?

Description : What is meant by PMDC?

Last Answer : PMDC stands for Permanent Magnet DC Motor A Permanent Magnet DC Motor is similar to an ordinary dc shunt motor except that its field is provided by permanent magnets instead of salient-pole ... -earth magnets The major advantages are low noise, small size, high-efficiency, low manufacturing cost.

What is meant by cyclo-converter?

Description : What is meant by cyclo-converter?

Last Answer : It is also known as frequency changer. It converts input power at one frequency to output power at another frequency with one stage conversion.

What is meant by commutation?

Description : What is meant by commutation?

Last Answer : The process of changing the direction of current flow in a particular path of the circuit. It is used to turn off the SCR.

What type of gating signal is used in single phase ac voltage controller with RL load?

Description : What type of gating signal is used in single phase ac voltage controller with RL load?

Last Answer : High frequency carrier gating signal is used for single phase ac voltage controller with RL load.

What is the difference between ON-OFF control and phase control?

Description : What is the difference between ON-OFF control and phase control?

Last Answer : ON-OFF control: In this method, the thyristors are employed as switches to connect the load circuit to the source for a few cycles of the load voltageand disconnect it for another few cycles. Phase ... switches connect the load to the ac source for a portion of each half cycle of input voltage.

What is the main drawback of a single phase half bridge inverter?

Description : What is the main drawback of a single phase half bridge inverter?

Last Answer : It require a 3-wire dc supply.

Give an expression for average voltage of single phase semiconverters.

Description : Give an expression for average voltage of single phase semiconverters.

Last Answer : Average output voltage Vdc= (Vm / π) (1 + cos α).

What are the advantages of single phase bridge converter over single phase mid-point converter?

Description : What are the advantages of single phase bridge converter over single phase mid-point converter?

Last Answer : a. SCRs are subjected to a peak-inverse voltage of 2Vm in a fully controlled bridge rectifier. Hence for same voltage and currnt ratings of SCrs, power handled by mid-point configuration is about ... load power. As such, the transformer rating in mid-point converter is double the load rating.