Part No. UAA Download, UAA Click to view. File Size, Kbytes. Page, 11 Pages. Maker, TEMIC [TEMIC Semiconductors]. Homepage. UAA datasheet, UAA pdf, UAA data sheet, datasheet, data sheet, pdf, Control Circuit for Industrial Applications, Download UAA datasheet from. The UAA is a bipolar integrated circuit, designed to provide phase control for industrial applications. It permits the number of components in thyristor drive.

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UAA (UAA / UAA) Phase Control Circuit Components datasheet pdf data sheet FREE from Datasheet (data sheet) search for integrated circuits (ic), semiconductors and other electronic PDF Download. UAA (PDF) Phase Control Circuit for Industrial Applications UAA Phase Control Circuit for Industrial UAApdf. Download UAA Datasheet. UAA Datasheet, (UAA / UAA) Phase Control Circuit. UAA Search Keywords: UAA, datasheet, pdf, Telefunken Microelectronics, UAA, Semiconductors datasheet search & download site (Privacy Policy & Contact).

Each thyristor turn-on determines the turn-off of another thyristor from the same side of the bridge due to the natural commutation process described above or in Lab no. During the rectifier operation, all commutations occur when, in the opposite side of the bridge, a thyristor is in on-steady-state at the middle of this on-time interval.

The first problem appears when we want to start the converter, when we expect that a thyristor is already in on-state, but in fact it is not. For this reason the gate trigger circuit should generate two pulses simultaneously, electrically isolated: first trigger pulse for the thyristor that has to be in on-state and the second trigger pulse for the thyristor that must be turned on in that moment. For example, if we consider the instant when the thyristor T 1 must be turned on, when a gate trigger pulse is sent for it, another gate trigger pulse must be sent to the thyristor T T 1 T , see Fig Further when T 2 will be turned-on, a trigger pulse should be sent also for the thyristor T 1.

We can observe that the thyristor T 1 received two gate trigger pulses: the first when it must take the current conduction through the natural commutation process and the second trigger pulse, delayed by, that helps starting and operating the B phase-controlled rectifier.

If only a single pair of thyristors e. T 1 and T was turned-on simultaneously, the rectifier would start, but it can t operate with all thyristor combinations in discontinuous conduction mode.

In this mode both thyristors of the six pair combinations are turned off during the time period 11 Lab no. For this reason, to pass the rectifier through all six cycles of operation, it is necessary to use a control circuit which provides for each thyristor two trigger pulses delayed with o, as shown above. This circuit controls the first leg of the three-phase bridge rectifier, respectively the thyristors T 1 and T 4. It is noted that each pulse transformer is equipped with two secondary windings, the first winding for the thyristor that must be turned on at an instant and the second winding for the thyristor that must be in on-state at that instant.

To receive trigger pulses from two directions an OR logic circuit with two diodes is used for each thyristor gate.

In practice, to achieve the gate trigger circuits, specialized integrated circuits are used, such as UAA These circuits can detect only the zero crossing of the synchronization voltage v sync.

If for synchronization, the phase voltages v R, v S, v T are used, the zero crossing occurs with 3 o earlier from the natural commutation point see the zero crossing of the v R voltage and the position of the natural commutation point P 1 shown in Fig.


A solution to this synchronization version would be to limit the control voltage V control so that the gate trigger pulses can appear after a minimum delay of 3 from the zero crossing of the phase voltages.

The solution limits the control range, 12 12 Gheorghe Asachi Technical University of Iasi, Power Electronics Laboratory restraining it to the maximum 15 o el.

To avoid all these difficulties, it is best to synchronize the trigger circuits according to the line-to-line voltages v RT, v SR, v TS which crosses zero exactly in the points of natural commutation position.

Laboratory application To achieve the laboratory setup of the three-phase bridge rectifier B , the same flexible laboratory installation described in the Lab no.

This installation is dedicated to the three-phase rectifiers study. For the present application, there will be made the connections on the panel in order to obtain the B thyristor structure, in a first experiment with resistive-inductive load R-L , as in Fig. In the case of R-L load, an autotransformer ATR will be used as filter inductance L f, while for the load resistance a rheostat will be used.

By changing the position of the ATR cursor it can be adjusted the inductance value and can be induced the discontinued conduction mode. At the limit, when the cursor is in zero position, the rectifier load can be considered purely resistive. On the other hand, by changing the rheostat cursor position we can change the resistance value and therefore the magnitude of the average output current.

Image of the laboratory application. In the active load variant, as a filter inductance we can use the same autotransformer or a fixed value inductance especially designed for laboratory experiments see Fig. By using the autotransformer we can induce the discontinuous conduction mode of rectifier operation.

The load current changing can 13 Lab no. This brake is supplied by a laboratory DC source and through its voltage adjustment the brake torque can be modified and therefore the rectifier output current. To display the waveforms of currents i d and i R, shunts will be used.

UAA145 - Phase Control Circuit for Industrial Applications

The circuit elements connections will be achieved through cables provided with banana plugs. Procedures and objectives 1.

It will be studied the theoretical aspects regarding the operation of the three phase bridge rectifiers with current filter: waveforms, equation of the average output voltage, control characteristic, disturbances introduced into the utility grid, control aspects, etc.

It will be performed with the help of the laboratory installation, the experimental setup with the block diagram shown in Fig. It will be started the control block of the installation and it will be successively displayed using an oscilloscope, the synchronization voltage v sync together with the zero pulses, saw-tooth signal and the gate trigger pulses from the front panel of each control module corresponding to each leg of the three-bridge made with the UAA integrated circuits; 4.

From the front panel of distribution module it will be displayed the trigger pulses for each thyristor before the pulse transformer and it will be noticed that each power device is triggered with two successive current pulses shifted with o.

This aspect can be observed also if we display the trigger pulses directly from the thyristors gate; 5. It will be supplied the power block of the installation B thyristor structure by pushing the START button and it will be displayed the waveforms of u M3p, respectively u M3n voltages provided by the two M3 structures included in the B topology continuous conduction mode high L f ;. It will be displayed the v d and i d waveforms for different control angles, in the rectifier mode.

It will be observed that the voltage v d waveform results from the difference of the v M3p and v M3n waveforms. It will be fixed a control angle over o and it will be decreased, progressively, the filter inductance modifying the position of the autotransformer cursor until 14 14 Gheorghe Asachi Technical University of Iasi, Power Electronics Laboratory the discontinued conduction mode occurs and it will be observed the increase of the average output voltage as this mode is accentuated; 9.

It will be highlighted the motor speed variation with the delay angle adjusting in the range of o 9 o and in the presence of a low load torque imposed by the electromagnetic brake; In the conditions of using a variable filter inductance autotransformer it will be induced the discontinued conduction mode of operation and it will be observed the changing of the voltage waveform v d, the increasing of the output DC voltage and the motor speed increasing after this mode appears; It will be set the value of the filter inductance at the limit of the discontinuous conduction mode and it will be seen the disappearance of this mode if the load torque is increased with the help of electromagnetic brake the increase of the rectifier output current over a threshold corresponding to the L f value ; The waveform of the input phase AC current will be displayed with the help of a shunt inserted on the R phase supply path.

It will be discussed this waveform. The change of this waveform will be highlighted once the filter inductance decreases, both in continuous and also in discontinuous conduction mode.

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Pin The lower the sync voltage, longer is the sync pulse minimum max. Pulse Phasing Limits The pulse phasing front limit is determined by limiting the maximum shift voltage applied to Pin 8 which is thus adjustable by external circuitry. This can be done by connecting a Z-diode between Pin 8 and Pin 3. A1, May Ref. UAA 0.

UAA145 Datasheet (PDF) - TEMIC Semiconductors

Pin 14 V Osat Symbol Min. Pin Pin 14 Pin 10 t 0. Unit 30 mA 9. Unit m s 0.Consequently, an additional filter inductance L f must be used.

Even the frequency of the pulses from the waveform of the output DC voltage f p f 3Hz is three times higher than in the case of a single-phase bridge rectifier B2 , many times the DC load s own inductance is insufficient to filter enough the DC current and to avoid the discontinuous conduction mode of the rectifier operation.

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During the negative half-wave, it also receives a positive trigger pulse from pin 4. Pin Outputs Q and Q 2 supply the inverse signals of Q and Q 2.