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SANAA
UREMBO NA USTAWI
UJANJA
UTAMADUNI NA HISTORIA
BURUDANI
MAZINGIRA
CHAKULA NA VINYWAJI
UHANDISI WA KINYUME
SAYANSI
MICHEZO
TEKNOLOJIA
VAZI
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.
Juu
Unknown
Maagizo
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.
Vifaa kwa hatua hii:
Sanduku la alumini1 kipande
Waya laini yenye plagi1 kipande
Swichi ya mpini1 kipande
Fyuzi1 kipande
Transfoma ya Kushusha Volteji2 vipande
Dayodi6 rectifiers
Kapasita ya elektroliti3 filters
Diodi ya Zener2 biasZana zinazohitajika:
Kekee cha mkono
Seti ya bisibisi2
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.
Vifaa kwa hatua hii:
Transista ya nguvu1 series pass
Kipozaji joto1 kipandeDiodi ya Zener1 current reference
Reostati1 current control
Ukinzani1 sensing, reference, trim set
Nguzo ya kuunganisha2 output + and -Zana zinazohitajika:
Chuma cha kulehemia3
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.
Vifaa kwa hatua hii:
Diodi ya Zener1 voltage referenceReostati1 voltage controlUkinzani1 reference, trim, compensation setZana zinazohitajika:
Chuma cha kulehemia4
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.
Vifaa kwa hatua hii:
Bamba la mzunguko lililochapishwa1 kipande
Mchanganyiko wa transista1 error amplifiers, cross-over pair, drivers, clampUkinzani1 seti
Potenshiomita1 clamp divider
Waya wa Lehemu1 as neededZana zinazohitajika:
Chuma cha kulehemia5
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.
Vifaa kwa hatua hii:
Mchanganyiko wa transista1 two lamp drivers
Soketi ya balbu2 vipande
Balbu ya taa2 vipandeZana zinazohitajika:
Seti ya bisibisiVifaa
19- 1 kipandeKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
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- 1 kipandeKishikilia Nafasi
- 2 vipandeKishikilia Nafasi
- 6 rectifiersKishikilia Nafasi
- 3 filtersKishikilia Nafasi
- 1 voltage referenceKishikilia Nafasi
- 1 series passKishikilia Nafasi
- 1 kipandeKishikilia Nafasi
- 1 voltage controlKishikilia Nafasi
- 1 setiKishikilia Nafasi
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- 1 kipandeKishikilia Nafasi
- 1 two lamp driversKishikilia Nafasi
- Kishikilia Nafasi
- 1 as neededKishikilia Nafasi
- 2 vipandeKishikilia Nafasi
- 2 vipandeKishikilia Nafasi
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