Ubufatanye
UBUHANZI
UBWIZA N'UBUZIMA
UBUKORIKORI
UMUCO N'AMATEKA
IMYIDAGADURO
IBIDUKIKIJE
IBIRIBWA N'IBINYOBWA
UBWUBATSI BUSUBIRA INYUMA
UBUMENYI
SIPORO
IKORANABUHANGA
IBYAMBARWA
Adjustable Bench Power Supply: Constant Voltage / Constant Current with Cross-Over Lamps (Gately, Forbro, US 3,303,411, 1967)
An all-transistor bench supply with two knobs: one sets the voltage, the other the current. It holds the set voltage until the load tries to draw more than the set current, then switches at once to holding the current, and back again, with no in-between state. Two lamps show which mode is in control.
Result: an adjustable constant-voltage / constant-current DC supply with mode lamps.
Source: J. R. Gately (Forbro Design), US 3,303,411 (1967). Unknown: all component values and ratings. Builds on the same inventor's 1966 current-limited supply. Picture: the patent drawing.
Hejuru
Unknown
Amabwiriza
1
1
Build the raw supplies
Build the raw supplies
In a case, wire the cord through a switch and fuse to two power transformers, each with rectifiers and a filter: one gives the main power to be regulated, the other the bias supplies, held steady by Zener diodes. Not given: the voltages. Ours: the case, switch and fuse.
Ibikoresho by'iyi ntambwe:
Agasanduku ka alumini1 igice
Umugozi w'amashanyarazi woroshye ufite purize1 igice
Buto y'agati1 igice
Fuzibule1 igice
Transiforumateri Imanura Voltage2 ibice
Diyodi6 rectifiers
Kondenseri ya elegitorolitike3 filters
Diyode ya Zener2 biasIbikoresho bikenewe:
Igikoresho cyo gutobora gikoreshwa n'intoki
Ikusanyirizo ry'ibitorezi2
2
Fit the pass transistor and current bridge
Fit the pass transistor and current bridge
Put a power transistor on a heat sink in series with the output: collector to the negative supply, emitter through a current-sensing resistor to the negative output terminal. Make the current bridge from the sensing resistor, a reference Zener, a reference resistor and the adjustable current-control resistor: the output current is proportional to its setting. A small trimming resistor sets the maximum current. Not given: the values.
Ibikoresho by'iyi ntambwe:
Tranzisitori y’ingufu1 series pass
Igikoresho gikonjesha1 igiceDiyode ya Zener1 current reference
Rewositati1 current control
Ubukomezi bw'amashanyarazi1 sensing, reference, trim set
Inkingi y'ihuza2 output + and -Ibikoresho bikenewe:
Icyuma cyo gusudira3
3
Build the voltage bridge
Build the voltage bridge
Make the voltage bridge from a reference Zener, a reference resistor, the adjustable voltage-control resistor and the load itself across the output. A small trimming resistor sets the maximum voltage. Add two resistors that feed the current bridge enough extra to cover the voltage bridge's own current and any voltmeter across the output, so low currents are still held exactly.
Ibikoresho by'iyi ntambwe:
Diyode ya Zener1 voltage referenceRewositati1 voltage controlUbukomezi bw'amashanyarazi1 reference, trim, compensation setIbikoresho bikenewe:
Icyuma cyo gusudira4
4
Build the amplifiers and cross-over
Build the amplifiers and cross-over
Give each bridge an error amplifier. Feed the two amplified errors to the bases of a pair of transistors sharing one emitter resistor: whichever base is the more negative takes control and cuts the other off, so the supply is always cleanly in voltage mode or current mode. Amplify the shared emitter signal through two more transistors to drive the pass transistor's base. Add an emitter-follower clamp on the bias line. Not given: the transistor types.
Ibikoresho by'iyi ntambwe:
Ikibaho cy'umuzunguruko cyacapwe1 igice
Transisitori zinyuranye1 error amplifiers, cross-over pair, drivers, clampUbukomezi bw'amashanyarazi1 ikirundo
Potensiyometero1 clamp divider
Urusinga rw'isudire1 as neededIbikoresho bikenewe:
Icyuma cyo gusudira5
5
Fit the mode lamps and use it
Fit the mode lamps and use it
From the cross-over pair, drive two lamp transistors, each lighting one lamp: one for voltage mode, one for current mode. In use, set the voltage and the current limit. With a light load the voltage lamp is lit and the voltage holds; if the load tries to draw more than the set current, the supply switches to holding the current and the current lamp lights.
Ibikoresho by'iyi ntambwe:
Transisitori zinyuranye1 two lamp drivers
Soketi y'itara2 ibice
Itara2 ibiceIbikoresho bikenewe:
Ikusanyirizo ry'ibitoreziIbikoresho
19- 1 igiceUmwanya
- Umwanya
- Umwanya
- 1 igiceUmwanya
- Umwanya
- 6 rectifiersUmwanya
- 3 filtersUmwanya
- 1 voltage referenceUmwanya
- 1 series passUmwanya
- 1 igiceUmwanya
- 1 voltage controlUmwanya
- 1 ikirundoUmwanya
- Umwanya
- Umwanya
- 1 two lamp driversUmwanya
- Umwanya
- 1 as neededUmwanya
- 2 ibiceUmwanya
- 2 ibiceUmwanya
Ibikoresho bikenewe
3- Umwanya
- 2 vendors sell this, none ship to you yetUmwanya
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