. The Bell System technical journal . ud in push-pull Iashion to changes in output \-oltage VI ascovei-ed in Section 3. 31), (2) currents /i and h are amplified by the 2-wattn-p-n transistors {T^) and (7^4), (3) the amplified currents (I3) and (74)flow in control windings (Ci) and (C2) of the magnetic amplifier to con-trol the voltage absorbed by the power winding (LI), (4) this actionregulates the average value of the voltage rectified by the germaniumdiode (Dl), thus completing the feedback loop. Tests show that thiscircuit is capable of ±1 per cent accuracy of the output voltage with azbl5
. The Bell System technical journal . ud in push-pull Iashion to changes in output \-oltage VI ascovei-ed in Section 3. 31), (2) currents /i and h are amplified by the 2-wattn-p-n transistors {T^) and (7^4), (3) the amplified currents (I3) and (74)flow in control windings (Ci) and (C2) of the magnetic amplifier to con-trol the voltage absorbed by the power winding (LI), (4) this actionregulates the average value of the voltage rectified by the germaniumdiode (Dl), thus completing the feedback loop. Tests show that thiscircuit is capable of ±1 per cent accuracy of the output voltage with azbl5 per cent change in the line voltage and with load current variationsof from 10 to 100 per cent of rated output current. 60-Volt, 200-Ampere Germanium Rectifier Fig. 22 is a circuit sketch of a 65-volt, 200-ampere regulated rectifiersuitable for charging and floating central office storage batteries. Thisrectifier employs six of the power rectifying cells with forced air cooling FILTER REGULATINGREACTORS TO 3 PHASE60 CYCLE LINE. HIGH-LEVEL LOW-LEVEL (2 WATTS) (50 MILLIWATTS) Fig. 22rectifier. voH two-hundred amjjore nuigiietic amplifier regulat(!d 856 THE BELL SYSTEM TECHNICAL JOURNAL, JULY 1954 described earlier (Diode IV, Fig. 2), a reference voltage diode (DiodeI, Fig. 2), two 50-milli\vatt, and two 2-watt junction transistors. The dc output voltage of the rectifier is controlled by a high gain selfsaturating magnetic amplifier. High gain in the magnetic amplifier isachieved by using tapewound gapless nickel-iron cores having rectangu-lar hysteresis loops. The control current for the magnetic amplifier isprovided by 2, 2-watt n-p-n transistors acting in push-pull. The 2-watttransistors are driven by 2, 50-milliwatt p-n-p transistors also acting inpush-pull. The circuit is similar to Fig. 21. Again, the reference potentialis furnished by a reference voltage diode. Where the rectifier is connected to storage batteries an additionalfeature kno^vn as current dr
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