Firing Circuit for Three-Phase Thyristor-Bridge Rectifier

Ilango, B.; Krishnan, R.; Subramanian, R.; Sadasivam, S.

doi:10.1109/tieci.1978.351497

Cited by 17 publications

(7 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…By changing the percentage duty cycle of the applied voltage, the average power delivered to an electric motor, and hence the speed, of the motor can be varied accordingly. Typically, the analog signal is connected to the inverting terminal of the comparator while the carrier is connected to the non-inverting terminal The carrier need not be symmetrical, although the linearity of the waveform is important [3].…”

Section: The Pwm Firing Schemementioning

confidence: 99%

See 1 more Smart Citation

Pulse Width Modulation Technique for the Speed Control of M-Phase Ac Motors

Osarumwense

Matthew

2019

JESR

View full text Add to dashboard Cite

Thyristors are now widely used in many power electronics and motor driven applications and all the known methods of control are nothing but variations of either the phase angle firing control (PFC) or the pulse width modulation control (PWM). Each of these methods has its own benefits and disadvantages, but the pulse width modulation control method is, perhaps, by far, the most effective and costly method. Since PWM differs from phase firing control (PFC) in that the control action of PWM takes place only during the time of the firing pulse, this research seeks to develop a combination firing package that maximizes the benefits of the two methods. At first a thyristor is configured as a PNP-type power transistor latch with two ordinary NPN bipolar switching transistors. The power transistor is switched on by zero crossover firing and then switched off by phase angle delay firing. The performance of the model was evaluated and the dynamic characteristics of the motor, such as speed, current, voltage and the total harmonic distortion were carried via simulation. The results shows that by using the Modified PWM firing technique the speed of an m-phase induction motor can be controlled more effectively and reliably. The circuit is easy to implement and cost effective and may be patented and made available for commercial use.

show abstract

Section: The Pwm Firing Schemementioning

confidence: 99%

“…Pulse width modulation allows us to have control over the percentage ON and OFF duty cycle of the applied voltage. With PWM, the speed control of an induction motor has been shown to be more than a match for DC drives [3,4]. This research is primarily concerned with the phase angle control of pulse width modulation.…”

Section: Introductionmentioning

confidence: 99%

Pulse Width Modulation Technique for the Speed Control of M-Phase Ac Motors

Osarumwense

Matthew

2019

JESR

View full text Add to dashboard Cite

show abstract

“…TLP250 needs DC supply which is provided by isolated grounding transformer (230/12V) described in further section. Finally the pulses fed to the thyristor [13] [14].…”

Section: Principle and Operationmentioning

confidence: 99%

Hardware design and implementation of Unity Power Factor Rectifiers using microcontrollers

Mahato

Thakura

Jana

2014

2014 IEEE 6th India International Conference on Power Electronics (IICPE)

View full text Add to dashboard Cite

In this work, a hardware design of phase controlled rectifier has been implemented in an economical manner in power electronics laboratory using microcontroller. Various observations are recorded in this field in centuries but introducing microcontroller in this arena would be a new phase in this field of research, thus making the process more precise with faster response. Microcontroller is used to generate gate pulses to SCR. Zero Crossing Detector is employed for synchronizing the input with firing pulses in order to have controlled DC output. Detailed description and functioning of individual blocks is explained with the relevant waveforms. All waveforms obtained from 200MHz DSO at different stages are included along with the output waveforms obtained on PSIM Software. Phase controlled rectifiers are better than uncontrolled rectifier in the aspect of harmonics generated as well as controlled DC output.

show abstract

“…When power supply is connected to the relaxation circuit, capacitor starts charging through a very high charging resistance and reaches to the peak voltage (Vp) and current starts flowing through the emitter resistance. Assuming voltage drop and resistance offered by the diode negligible, current is given as (6) When UJT goes into the conduction region this value of current starts flowing through the emitter resistance connected at the B1 terminal and some voltage drop across emitter resistance is there which is given by…”

Section: A Relationship For Proposed Parameter Verifying Resemblamentioning

confidence: 99%

“…In power transmission, three phase supply are used and the value of average voltage is controlled with the help of silicon controlled rectifier. Thus three balanced oscillator to fire or trigger the SCR's are required which can be fulfilled with UJT oscillator [5] [6]. However, power controlled devices such as gate turn-off thyristors etc.…”

Section: Introductionmentioning

confidence: 99%

To propose a design parameter γ, resistor transfer parameter for UJT which shows resemblance with BJT

Mittal

Khullar

Kapur

et al. 2012

2012 Students Conference on Engineering and Systems

View full text Add to dashboard Cite

We propose a design parameter (γ), named as resistance transfer parameter, which illustrate a resistance transfer phenomenon among emitter terminal and the base terminal B1, in the unijunction transistor (UJT). To demonstrate the phenomena in UJT, a circuit design is proposed which is based on basic circuit of relaxation oscillator employing UJT. However an additional resistor is employed at the emitter terminal which shows reflection at the base terminal. The proposed resistance phenomena in UJT is observed through simulation results and verified experimentally on the actual hardware by building the proposed relaxation oscillator design on a bread board. The experimental results verify our proposed phenomenon in UJT. We have performed experiments to check variation with supply voltage and to analyze variation with change in Re and Rb1, which verify our proposed phenomenon that the resistance at emitter gets reflected at base B1. Thus we propose a new design parameter for UJT, resistance transfer parameter (γ) which governs the transfer of emitter resistance to the terminal B1 of the UJT. The proposed phenomena and transfer parameter (γ) of UJT resembles with the behavior of bipolar junction transistor (BJT), which in turn verify our proposed phenomenon. Moreover our modified relaxation oscillator generates wide duration pulses which in turn can be used in various applications like SCRs, gate-turn-off thyristor requiring large duration trigger pulses.

show abstract

Firing Circuit for Three-Phase Thyristor-Bridge Rectifier

Cited by 17 publications

References 3 publications

Pulse Width Modulation Technique for the Speed Control of M-Phase Ac Motors

Pulse Width Modulation Technique for the Speed Control of M-Phase Ac Motors

Hardware design and implementation of Unity Power Factor Rectifiers using microcontrollers

To propose a design parameter γ, resistor transfer parameter for UJT which shows resemblance with BJT

Contact Info

Product

Resources

About

Firing Circuit for Three-Phase Thyristor-Bridge Rectifier

Cited by 17 publications

References 3 publications

Pulse Width Modulation Technique for the Speed Control of M-Phase Ac Motors

Pulse Width Modulation Technique for the Speed Control of M-Phase Ac Motors

Hardware design and implementation of Unity Power Factor Rectifiers using microcontrollers

To propose a design parameter &#x03B3;, resistor transfer parameter for UJT which shows resemblance with BJT

Contact Info

Product

Resources

About

To propose a design parameter γ, resistor transfer parameter for UJT which shows resemblance with BJT