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BRX44 thru BRX47 BRX 2. Motorola Thyristor Device Data. THERMAL CHARACTERISTICS. Characteristic. Symbol. Max. Unit. Thermal Resistance, Junction. BRX49 SCR datasheet, cross reference, circuit and application notes in pdf format. BRX49 Datasheet, BRX49 PDF, BRX49 Data sheet, BRX49 manual, BRX49 pdf, BRX49, datenblatt, Electronics BRX49, SILICON CONTROLLED RECTIFIER.

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For full wave dc control, two methods are possible. Two SCRs may be used in a bridge rectifier see Figure 2.

Figure 2. Delay Motorola Thyristor Device Data angle is the time, measured in electrical degrees, during which the SCR is blocking the line voltage. The period during which the SCR is on is called the conduction angle.


It is important to note that the SCR is a voltage controlling device. The load and power source determine the circuit current.

Now we arrive at a problem. Different loads respond to different characteristics of the ac waveform. Some loads are sensitive to peak voltage, some to average voltage and some to rms voltage.

Figures 2. These voltages have been normalized to the rms of the applied voltage. To determine the actual peak, average or rms voltage for any conduction angle, we simply multiply the normalized voltage by the rms value of the applied line voltage.

These normalized curves also apply to current in a resistive circuit. Since the greatest majority of circuits are either or volt power, the curves have been redrawn for these voltages in Figures 2.

A relative power curve has been added to Figure 2.

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Incandescent lamps and motors do not follow this curve precisely since their relative impedance changes with applied voltage. To use the curves, we find the full wave rated power of the load, then multiply by the fraction associated with the phase angle in question.

For example, a conduction angle in a half wave circuit provides 0.

An interesting point is illustrated by the power curves. A conduction angle of 30 provides only three per cent of full power in a full wave circuit, and a conduction angle of provides 97 per cent of full power. Thus, the control circuit can provide 94 per cent of full power control with a pulse phase variation of only Sound 2. Sl for the PV of the control switch voltage meter.


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It is essential that all cells assembled in the pack are at an identical stateof-charge voltage before charging. This works because the F capacitor will be seen as a low impedance to a voltage spike. Turnon of the SCR is thus accomplished with a short, high current pulse. Two SCRs may be used in a bridge rectifier see Figure 2.