3 phase full wave controlled rectifier with resistive load ppt

Oday A. Ahmed single phase full wave controlled rectifiers with RL load Full-wave Bridge converter Full-wave Fully-controlled converter.

Rectifying diodes in experience twice the reverse voltage, 2 2Vsas that Full-wave mid-point converter experienced by each of the four diodes in the circuit of2 Vs. Ahmed single phase full wave controlled rectifiers with RL load oad l RL o hl t i w.

The load current is discontinuous for Generally the load current is continuous for low values of load inductance and for large load inductance and for low trigger large values of trigger angles.

Ahmed Discontinuous load current operation average and RMS output voltage. RMS output voltage H. W Comparison between Vdc for half and full wave controlled rectifier Dr. This disadvantage can be overcome by connecting a diode across the load Half-wave controlled Rec.

Ahmed Single-phase full-wave bridge rectifier circuit with a C-filter The average voltage Diodes conducting t t vo t t t. Ahmed ] Single-phase full-wave bridge rectifier circuit with a C-filter The Output voltage Ripple The maximum output voltage occurs at.

Ignoring diode voltage drops and assume the diode start conducting at Ahmed Single-phase full-wave bridge rectifier circuit with input stray inductance Its shown that Tl and T2 are fired outgoing SCRs T3 and T4 get turned off due to the application of reverse voltage and the current shifts to SCRs T l and T2 instantaneously. This is possible only if the voltage source has no internal impedance.

If the source impedance is Rs IoRs voltage drop occur Vo dc reduced by IoRs Single-phase full-wave bridge rectifier circuit with input stray inductance the source impedance could be consist of internal resistance R s and stray inductance Ls Single-phase full-wave bridge rectifier circuit with input stray inductance.

T1T2 are triggered at a firing angle the commutation of already conducting T3, T4 begins Due to Ls the current via outgoing devices T3, T4 decreases gradually to zero from its initial value of io whereas in incoming SCRs T1, T2 ; the current builds up gradually from zero to full value of io Single-phase full-wave bridge rectifier circuit with input stray inductance Overlap Period During overlap period : the full-bridge equivalent circuit during this period is look like the following circuit: The current flow via Ls, T1, Load, and T2.

Thus, output voltage with overlap period Single-phase full-wave bridge rectifier circuit with input stray inductance From load current equation can be obtained. Substitute It can be seen from equation above that the voltage drop due to Ls, is proportional to Io and L s. The single phase controlled rectifiers provide a maximum dc output of The single phase full wave controlled rectifiers provide two output pulses during every input supply cycle and hence still the output voltage has low DC value and high voltage ripple.

Higher DC voltage. Better input power factor pf.

3 phase full wave controlled rectifier with resistive load ppt

Less ripple content in output current; therefore better load performance. Lower size of filter circuit parameters because of higher ripple frequency. What is the output ripple frequency of single-phase rectifier? The output ripple frequency is equal to the twice the ac supply frequency.

Ahmed 3-Phase Rectifier Classifications Three-phase rectifiers Three-phase halfwave rectifier Three-phase midpoint 6-pulse rectifier Three-phase bridge rectifier Three-phase 12pulse rectifier.The 3-phase half wave converter combines three single phase half wave controlled rectifiers in one single circuit feeding a common load. The third thyristor S3 in series with the supply phase winding acts as the third half wave controlled rectifier.

Figure bellow shows three phase fully controlled rectifier. When S2 conducts the phase voltage vbnappears across the load until the thyristor S3 is triggered. The common neutral point of the supply is connected to one end of the load while the other end of the load connected to the common cathode point. The phase voltage Van appears across the load when S3 conducts. The figure shows the 3-phase input supply voltages, the output voltage which appears across the load, and the load current assuming a constant and ripple free load current for a highly inductive load and the current through the thyristor T1.

The frequency of output ripple frequency for a 3-phase half wave converter is fs, where fs is the input supply frequency. The 3-phase half wave converter is not normally used in practical converter systems because of the disadvantage that the supply current waveforms contain dc components.

Lesson 2 Chapter Two Three Phase Uncontrolled Rectifier

Three Phase Full Wave Controlled Rectifier The 3-phase half wave converter combines three single phase half wave controlled rectifiers in one single circuit feeding a common load. Ac dc power converters single phase full wave controlled rectifier single phase half wave controlled rectifier three phase full wave controlled rectifier three phase half controlled rectifier. Amplifier instrumentation amplifier inverting amplifier isolation amplifier non inverting amplifier operational amplifier unity gain buffer.

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You must have JavaScript enabled in your browser to utilize the functionality of this website. Sign up to get notified when this product is back in stock. The Three phase controlled rectifiers provide a maximum dc output of.

The output ripple frequency is equal to the twice the ac supply frequency. The single phase full wave controlled rectifiers provide two output pulses during every input supply cycle and hence are referred to as two pulse converters.

Three phase converters are 3-phase controlled rectifiers which are used to convert ac input power supply into dc output power across the load. Features of 3-phase controlled rectifiers are. Three phase controlled rectifiers are extensively used in high power variable speed industrial dc drives. Three single phase half-wave converters are connected together to form a three phase half-wave converter as shown in the figure. The thyristor T 1 in series with one of the supply phase windings 'a-n' acts as one half wave controlled rectifier.

The second thyristor T 2 in series with the supply phase winding 'b-n' acts as the second half wave controlled rectifier. The third thyristor T 3 in series with the supply phase winding acts as the third half wave controlled rectifier. The 3-phase input supply is applied through the star connected supply transformer as shown in the figure.

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The common neutral point of the supply is connected to one end of the load while the other end of the load connected to the common cathode point. The load current flows through the supply phase winding 'a-n' and through thyristor T 1 as long as T 1 conducts. The load current flows through the thyristor and through the supply phase winding 'b-n'. When T 2 conducts the phase voltage v bn appears across the load until the thyristor T 3 is triggered. The phase voltage V an appears across the load when T 3 conducts.

When T 1 is triggered again at the beginning of the next input cycle the thyristor T 3 turns off as it is reverse biased naturally as soon as T 1 is triggered. The figure shows the 3-phase input supply voltages, the output voltage which appears across the load, and the load current assuming a constant and ripple free load current for a highly inductive load and the current through the thyristor T 1. The trigger angle is measured from the cross over points of the 3-phase supply voltage waveforms.

Three phase half wave controlled rectifier output voltage waveforms for different trigger angles with RL load. Three phase half wave controlled rectifier output voltage waveforms for different trigger angles with R load.

3 Phase Full Wave Bridge Converter

When the phase supply voltage decreases to zero atthe load current falls to zero and the thyristor T 1 turns off. Hence the average dc output voltage for a 3-pulse converter 3-phase half wave controlled rectifier is calculated by using the equation. All the six thyristors are controlled switches which are turned on at a appropriate times by applying suitable gate trigger signals.

The three phase full converter is extensively used in industrial power applications upto about kW output power level, where two quadrant operations is required.After you enable Flash, refresh this page and the presentation should play. Get the plugin now. Toggle navigation. Help Preferences Sign up Log in.

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To view this presentation, you'll need to allow Flash. Click to allow Flash After you enable Flash, refresh this page and the presentation should play. View by Category Toggle navigation. Products Sold on our sister site CrystalGraphics. Title: Three Phase Controlled Rectifiers. Description: Extensively used in high power variable speed industrial dc drives. Power factor is better than that of 3 phase half wave converter.

Tags: controlled converter inverter phase power rectifiers three. Latest Highest Rated. Madhusudhan Rao, EC Dept. They provide higher dc output voltage. Higher dc output power.

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Higher output voltage ripple frequency. Filtering requirements are simplified for smoothing out load voltage and load current. Three single phase half-wave converters can be connected together to form a three phase half-wave converter. Single quadrant operation is possible. Power factor decreases as the delay angle increases. Known as a 6-pulse converter. Used in industrial applications up to kW output power. Two quadrant operation is possible. The frequency of output ripple voltage is 6fS.

T1 is triggered at? During the interval?

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Used for applications up to 2 mega watt output power level. Dual converter consists of two 3 phase full converters which are connected in parallel in opposite directions across a common load. Circulating current free non circulating mode of operation Circulating current mode of operation 80 Prof. Power flows from ac source to the load 81 Prof. Power flows from load circuit to ac source.

The output load voltage load current reverse when converter 2 is on. Power flows from ac source to the load 83 Prof. Power flows from load to the ac source. Energy is supplied from the load circuit to the ac supply. One converter operates in the rectification mode while the other operates in the inversion mode. Trigger angles? Vdc is positive Idc is positive and Pdc is positive.The average current in AC source is zero in the full-wave rectifier, thus avoiding problems associated with nonzero average source currents, particularly in transformers.

The output of the full-wave rectifier has inherently less ripple than the half-wave rectifier. Uncontrolled and controlled single-phase and threephase full-wave converters used as rectifiers are analyzed. With electrical isolation, only one diode voltage drop between the source and load, suitable for low-voltage, high-current applications. If L is relatively large, the load current is essentially dc. Irms Io Source harmonics are rich in the Filtersreducing the harmonics.

For continuous current operation, the only modification to the analysis that was done for R-L load is in the dc term of the Fourier series. The dc component of current in this circuit is. The sinusoidal terms in the Fourier analysis are unchanged by the dc source, provided that the current is continuous. Discontinuous current is analyzed like section L-C filtered output Fig. Analysis of the controlled full-wave rectifier operating in the discontinuous current mode is identical to that of the controlled half-wave rectifier, except that the period for the output current is.

The ac voltage terms are unchanged from the controlled rectifier with an R-L load. The ac current terms are determined from circuit. Power absorbed by the dc voltage is. For inverter operation, power is supplied by the dc source, and power is absorbed by the bridge and is transferred to the ac system. Because of the six transitions that occur for each period of the source voltage, the circuit is called a six-pulse rectifier. Adevantageoutput is inherently like a dc voltage, and the highfrequency low-amplitude harmonics enable filters to be effective.

Harmonics for output voltage remain of order 6k, but amplitude are functions of. The peak output of the twelve-pulse converter occurs midway between alternate peaks of the six-pulse converters.

Three Phase Full Wave Controlled Rectifier

Adding the voltages at that point for 0 gives. Since a transition between conducting SCRs every 30there are a total of 12 such transitions for each period of the ac source. The output has harmonic frequencies which are multiple of 12 times the source fre. More expense for producing high-voltage transformers with the appropriate phase shifts. Used for very long distances of transmission lines.

Advantages 1 2. XC 3 Two conductors required rather than three 4 Transmission towers are smaller. System stability increased.

3 phase full wave controlled rectifier with resistive load ppt

Disadvantagescostly ac-dc converter, filter, and control system required at each end of the line to interface with the ac system. One of the lines is energized at Vdc and the other is energized at - Vdc. In emergency situations, one pole of the line can operate without the other pole, with current returning through the ground path.

Assume that the load current is constant Io. Learn more about Scribd Membership Home. Read Free For 30 Days. Much more than documents. Discover everything Scribd has to offer, including books and audiobooks from major publishers.Operating principle of three phase half wave uncontrolled rectifier The half wave uncontrolled converter is the simplest of all three phaserectifier topologies.

Although not much used in practice it does provide usefulinsight into the operation of three phase converters.

As oshown in Fig. The cathodes of all threediodes are connected together to form the positive load terminal. The negativeterminal of the load is connected to the supply neutral. It should be notedthat for the type of load chosen the converter always operates in the continuousconduction mode. The conduction diagram for the diodes as shown in Fig. Since thediodes can block only negative voltage it follows from the conduction table that aphase diode conducts only when that phase voltage is maximum of the three.

Insignal electronics the circuit of Fig. Once the conduction diagram is drawn other waveforms of Fig. The phase current waveforms of Fig. All ofthem have a dc component which flows through the ac source. This is one reason for which theconverter configuration is not preferred very much in practice. From the waveforms of Fig. The harmonics present in v and i can be found by Fourier series analysis oiof the corresponding waveforms of Fig.

Exercise 1Fill in the blank s with the appropriate word s. Assuming ripple free output current, find out the, displacement factor, distortion factor and power factor of a three phase half wave rectifier supplying an R — L load. With reference to Fig. Three phase full wave uncontrolled converter As has been explained earlier three phase half wave converter suffers fromseveral disadvantages.

Chief among them are dc component in the input ac current,requirement of neutral connection and comparatively lower output voltage. Inaddition the input and output waveforms contain lower order harmonics whichrequire heavy filtering. Most of these disadvantages can be mitigated by using a three phase fullwave bridge rectifier. In this section the operation of a three phase full wave uncontrolled bridge rectifierwith two different types of loads namely the R — L — E type load and the capacitiveload will be described.

Usually fordriving these loads a variable output voltage is required.Three phase converters Three phase converters provide higher average output voltage.

Frequency of ripples on output voltage is higher compared with that of single phase converter. For these reasons, three phase converters are extensively used in high power variable speed drivers. Three single phase half wave converters can be connected to form a three phase half wave converter. In the circuit shown above when any device conducts,line voltage is applied across load.

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Operation of semiconverters with R load With purely resistive load current will be in phase with load voltage.

Depending on value of firing angle, circuit can operate in two different modes. Therefore, line voltage RB is applied to load. Three phase semiconverters Three single phase half wave converters can be connected to form a three phase half wave converter. Ac dc power converters single phase full wave controlled rectifier single phase half wave controlled rectifier three phase full wave controlled rectifier three phase half controlled rectifier. Amplifier instrumentation amplifier inverting amplifier isolation amplifier non inverting amplifier operational amplifier unity gain buffer.

Combinational logic circuits arithmetic logic unit binaryaddersubtractor boolean algebra decoders demultiplexers encoders full adder full subtractor half adder half subtractor multiplexer.

3 phase full wave controlled rectifier with resistive load ppt

Control systems feedback control system transfer function and characteristic equation transfer function of electrical circuit. Dccircuits energy sources kirchhoffs current law kirchhoffs voltage law maximum power transfer theorem mesh analysis nodal analysis nortons theorem source transformations superposition theorem thevenins theorem.

Dc dc converter chopper classification of chopper step down chopper step up chopper switched mode power supplies smps uninterruptible power supply ups. Dc to ac inverter half bridge dc ac inverter single phase full bridge inverter single pwm inverters three phase inverter.

Digital logic families cmos and ttl interfaces cmos logic noise margin ttl logic. Digital logic gates and gate nand gate nor gate not gate or gate xnor gate xor gate.

3 phase full wave controlled rectifier with resistive load ppt

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