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UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
DC Power Supply: SCR-Regulated, Voltage and Current Bridges with Automatic Cross-Over (Kupferberg & Ash, Forbro, US 3,305,763, 1967)
A variable DC supply regulated by controlled rectifiers instead of a series transistor. Two of the four rectifiers in the bridge are silicon controlled rectifiers; how late in each half-cycle they are fired sets the output. A voltage bridge and a current bridge each make an error signal, an analog OR gate passes whichever is larger, and the supply crosses over automatically between holding the voltage and holding the current.
Result: a variable voltage / current regulated DC supply with automatic cross-over.
Source: K. Kupferberg and J. Ash (Forbro Design), US 3,305,763 (1967), Fig. 1. Unknown: component values and the firing-angle circuit. Picture: the patent drawing.
Juu
Unknown
Maagizo
1
1
Build the controlled rectifier bridge
Build the controlled rectifier bridge
In a case, wire the cord through a switch and fuse to a transformer. Feed its secondary into a bridge of two ordinary rectifiers and two silicon controlled rectifiers. Smooth the negative output through a choke and a capacitor, then through a current-sensing resistor (with a second capacitor forming a further filter) to the negative output terminal; the positive goes straight to the positive terminal. Ours: the case, switch and fuse. Not given: the ratings.
Vifaa kwa hatua hii:
Sanduku la alumini1 kipande
Waya laini yenye plagi1 kipande
Swichi ya mpini1 kipande
Fyuzi1 kipande
Transfoma ya Kushusha Volteji1 kipande
Dayodi2 vipande
Thairista (SCR)2 vipande
Koili ya kuchuja1 kipande
Kapasita ya elektroliti2 vipande
Nguzo ya kuunganisha2 output + and -Zana zinazohitajika:
Kekee cha mkono
Seti ya bisibisi2
2
Build the two bridges
Build the two bridges
Current bridge: the sensing resistor, a reference Zener, a fixed resistor and the variable current-control resistor. Voltage bridge: the load across the output, the variable voltage-control resistor, a fixed resistor and a second reference Zener. Feed both Zeners from a small separate supply. Not given: the values, the Zener supply.
Vifaa kwa hatua hii:
Diodi ya Zener2 vipande
Reostati2 voltage and current controls
Ukinzani1 sensing and bridge resistorsZana zinazohitajika:
Chuma cha kulehemia3
3
Build the control chain and use it
Build the control chain and use it
Invert the current bridge's error in a phase-reversing amplifier and feed it, with the voltage bridge's error, to an analog OR gate that passes the larger. Amplify the result and feed it to a firing-angle control circuit that fires the two controlled rectifiers' gates later or earlier in each half-cycle. In use, set the voltage and the current: for any load larger than the cross-over resistance (voltage setting divided by current setting) the supply holds the voltage, for a smaller one the current. Not given: the amplifier, OR-gate and firing circuits in this form.
Vifaa kwa hatua hii:
Bamba la mzunguko lililochapishwa1 kipande
Mchanganyiko wa transista1 amplifiers
Nyenzo isiyojulikana1 OR gate and firing-angle circuit
Waya wa Lehemu1 as neededZana zinazohitajika:
Chuma cha kulehemiaVifaa
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- 2 vipandeKishikilia Nafasi
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- 2 vipandeKishikilia Nafasi
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- 2 vipandeKishikilia Nafasi
- 2 voltage and current controlsKishikilia Nafasi
- 1 sensing and bridge resistorsKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 amplifiersKishikilia Nafasi
- 1 OR gate and firing-angle circuitKishikilia Nafasi
- 1 as neededKishikilia Nafasi
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