Ukusebenzisana
UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
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.
Osezingeni eliphezulu
Unknown
Imiyalelo
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.
Izinto zokwakha zalesi sinyathelo:
Ibhokisi le-aluminium1 ucezu
Intambo egobekayo enepulaki1 ucezu
Isivula esinesikhonkwane1 ucezu
I-fuse1 ucezu
I-Transformer Yokwehlisa2 izicucu
I-diode6 rectifiers
I-capacitor ye-electrolytic3 filters
I-Zener diode2 biasAmathuluzi adingekayo:
Ibhola lesandla
Isethi yezikulufudrayiva2
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.
Izinto zokwakha zalesi sinyathelo:
I-transistor yamandla1 series pass
Isipholisi sokushisa1 ucezuI-Zener diode1 current reference
I-rheostat1 current control
Ukumelana nogesi1 sensing, reference, trim set
Insika yokuxhuma2 output + and -Amathuluzi adingekayo:
Insimbi yokushisela3
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.
Izinto zokwakha zalesi sinyathelo:
I-Zener diode1 voltage referenceI-rheostat1 voltage controlUkumelana nogesi1 reference, trim, compensation setAmathuluzi adingekayo:
Insimbi yokushisela4
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.
Izinto zokwakha zalesi sinyathelo:
Ipuleti le-PCB1 ucezu
Inhlanganisela yama-transistor1 error amplifiers, cross-over pair, drivers, clampUkumelana nogesi1 isethi
I-potentiometer1 clamp divider
Ucingo Lwesoda1 as neededAmathuluzi adingekayo:
Insimbi yokushisela5
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.
Izinto zokwakha zalesi sinyathelo:
Inhlanganisela yama-transistor1 two lamp drivers
Isokhethi yebhalbhu2 izicucu
Ilambu2 izicucuAmathuluzi adingekayo:
Isethi yezikulufudrayivaIzinto
19- 1 ucezuIsibambeli
- 1 ucezuIsibambeli
- Isibambeli
- 1 ucezuIsibambeli
- 2 izicucuIsibambeli
- 6 rectifiersIsibambeli
- 3 filtersIsibambeli
- 1 voltage referenceIsibambeli
- 1 series passIsibambeli
- 1 ucezuIsibambeli
- 1 voltage controlIsibambeli
- 1 isethiIsibambeli
- Isibambeli
- 1 ucezuIsibambeli
- 1 two lamp driversIsibambeli
- Isibambeli
- 1 as neededIsibambeli
- 2 izicucuIsibambeli
- 2 izicucuIsibambeli
Amathuluzi Adingekayo
3- Isibambeli
- Isibambeli
- 2 vendors sell this, none ship to you yetIsibambeli
Le blueprint yenza
Ama-blueprint ahlobene
Lama-blueprint abelana ngolwazi — amasu, izinto noma izimiso
CC0 Isizinda Somphakathi
Le blueprint ikhishwe ngaphansi kwe-CC0. Ukhululekile ukukopisha, ukuguqula, ukusabalalisa, nokusebenzisa ngaphandle kwemvume.
Sekela uMenzi ngokuthenga imikhiqizo nge-Blueprint yabo IKhomishane Yomenzi kumiswe ngabathengisi, noma dala inguqulo entsha yale Blueprint bese uyifaka njengoxhumaniso ku-Blueprint yakho ukuze wabelane ngemali engenayo.