Ukusebenzisana
UBUCIKO
UBUHLE NEMPILO
UBUCIKO BEZANDLA
AMASIKO NOMLANDO
EZOKUZIJABULISA
IMVELO
UKUDLA NEZIPHUZO
REVERSE ENGINEERING
IZAYENSI
EZEMIDLALO
UBUCHWEPHESHE
IZINTO EZIGQOKWAYO
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.
Osezingeni eliphezulu
Unknown
Imiyalelo
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.
Izinto zokwakha zalesi sinyathelo:
Ibhokisi le-aluminium1 ucezu
Intambo egobekayo enepulaki1 ucezu
Isivula esinesikhonkwane1 ucezu
I-fuse1 ucezu
I-Transformer Yokwehlisa1 ucezu
I-diode2 izicucu
I-thyristor (SCR)2 izicucu
I-choke yokuhlunga1 ucezu
I-capacitor ye-electrolytic2 izicucu
Insika yokuxhuma2 output + and -Amathuluzi adingekayo:
Ibhola lesandla
Isethi yezikulufudrayiva2
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.
Izinto zokwakha zalesi sinyathelo:
I-Zener diode2 izicucu
I-rheostat2 voltage and current controls
Ukumelana nogesi1 sensing and bridge resistorsAmathuluzi adingekayo:
Insimbi yokushisela3
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.
Izinto zokwakha zalesi sinyathelo:
Ipuleti le-PCB1 ucezu
Inhlanganisela yama-transistor1 amplifiers
Okokwakha okungaziwa1 OR gate and firing-angle circuit
Ucingo Lwesoda1 as neededAmathuluzi adingekayo:
Insimbi yokushiselaIzinto
17- 1 ucezuIsibambeli
- 1 ucezuIsibambeli
- Isibambeli
- 1 ucezuIsibambeli
- 1 ucezuIsibambeli
- 2 izicucuIsibambeli
- 2 izicucuIsibambeli
- 1 ucezuIsibambeli
- 2 izicucuIsibambeli
- Isibambeli
- 2 izicucuIsibambeli
- 2 voltage and current controlsIsibambeli
- 1 sensing and bridge resistorsIsibambeli
- 1 ucezuIsibambeli
- 1 amplifiersIsibambeli
- 1 OR gate and firing-angle circuitIsibambeli
- 1 as neededIsibambeli
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.