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UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
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.
Hejuru
Unknown
Amabwiriza
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.
Ibikoresho by'iyi ntambwe:
Agasanduku ka alumini1 igice
Umugozi w'amashanyarazi woroshye ufite purize1 igice
Buto y'agati1 igice
Fuzibule1 igice
Transiforumateri Imanura Voltage1 igice
Diyodi2 ibice
Tiristori (SCR)2 ibice
Bobine yo kuyungurura1 igice
Kondenseri ya elegitorolitike2 ibice
Inkingi y'ihuza2 output + and -Ibikoresho bikenewe:
Igikoresho cyo gutobora gikoreshwa n'intoki
Ikusanyirizo ry'ibitorezi2
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.
Ibikoresho by'iyi ntambwe:
Diyode ya Zener2 ibice
Rewositati2 voltage and current controls
Ubukomezi bw'amashanyarazi1 sensing and bridge resistorsIbikoresho bikenewe:
Icyuma cyo gusudira3
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.
Ibikoresho by'iyi ntambwe:
Ikibaho cy'umuzunguruko cyacapwe1 igice
Transisitori zinyuranye1 amplifiers
Ibikoresho bitazwi1 OR gate and firing-angle circuit
Urusinga rw'isudire1 as neededIbikoresho bikenewe:
Icyuma cyo gusudiraIbikoresho
17- 1 igiceUmwanya
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- 2 ibiceUmwanya
- 2 voltage and current controlsUmwanya
- 1 sensing and bridge resistorsUmwanya
- Umwanya
- 1 amplifiersUmwanya
- 1 OR gate and firing-angle circuitUmwanya
- 1 as neededUmwanya
Ibikoresho bikenewe
3- Umwanya
- 2 vendors sell this, none ship to you yetUmwanya
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