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DC Power Supply: SCR-Regulated, Voltage and Current Bridges with Automatic Cross-Over (Kupferberg & Ash, Forbro, US 3,305,763, 1967)
Kenneth Kupferberg and Jaime Ash · Public domain (US patent drawing)
Ed

Dicipta oleh

Ed

3. November 2026FI
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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.
Lanjutan
Unknown

Arahan

1

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.

Bahan untuk langkah ini:

Kotak kalis aluminiumKotak kalis aluminium1 keping
Kord fleksibel berpalamKord fleksibel berpalam1 keping
Suis togolSuis togol1 keping
FiusFius1 keping
Transformer PenurunTransformer Penurun1 keping
DiodDiod2 keping
Tiristor (SCR)Tiristor (SCR)2 keping
Pencekik penapisPencekik penapis1 keping
Kapasitor elektrolitikKapasitor elektrolitik2 keping
Tiang pengikatTiang pengikat2 output + and -

Alatan diperlukan:

Gerimit tanganGerimit tangan
Set pemutar skruSet pemutar skru
2

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.

Bahan untuk langkah ini:

Diod ZenerDiod Zener2 keping
ReostatReostat2 voltage and current controls
RintanganRintangan1 sensing and bridge resistors

Alatan diperlukan:

Alat pematerianAlat pematerian
3

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.

Bahan untuk langkah ini:

Papan litar bercetakPapan litar bercetak1 keping
Pelbagai transistorPelbagai transistor1 amplifiers
Bahan tidak diketahuiBahan tidak diketahui1 OR gate and firing-angle circuit
Dawai PateriDawai Pateri1 as needed

Alatan diperlukan:

Alat pematerianAlat pematerian

Bahan

17
  • 1
    Kotak kalis aluminium
    1 keping
    Pemegang Tempat
  • 1
    Kord fleksibel berpalam
    1 keping
    Pemegang Tempat
  • 1
    Suis togol
    1 keping
    1 vendor sell this, none ship to you yet
    Pemegang Tempat
  • 1
    Fius
    1 keping
    Pemegang Tempat
  • 1
    Transformer Penurun
    1 keping
    Pemegang Tempat
  • 1
    Diod
    2 keping
    Pemegang Tempat
  • 1
    Tiristor (SCR)
    2 keping
    Pemegang Tempat
  • 1
    Pencekik penapis
    1 keping
    Pemegang Tempat
  • 1
    Kapasitor elektrolitik
    2 keping
    Pemegang Tempat
  • 1
    Tiang pengikat
    2 output + and -
    2 vendors sell this, none ship to you yet
    Pemegang Tempat
  • 2
    Diod Zener
    2 keping
    Pemegang Tempat
  • 2
    Reostat
    2 voltage and current controls
    Pemegang Tempat
  • 2
    Rintangan
    1 sensing and bridge resistors
    Pemegang Tempat
  • 3
    Papan litar bercetak
    1 keping
    Pemegang Tempat
  • 3
    Pelbagai transistor
    1 amplifiers
    Pemegang Tempat
  • 3
    Bahan tidak diketahui
    1 OR gate and firing-angle circuit
    Pemegang Tempat
  • 3
    Dawai Pateri
    1 as needed
    Pemegang Tempat

Alatan Diperlukan

3

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Blueprint berkaitan

Blueprint ini berkongsi pengetahuan — teknik, bahan atau prinsip

Bench Power Supply: Regulated, with Adjustable Current Limit and a Pentode Pass Tube (Gately, Forbro, US 3,243,690, 1966)

Bench Power Supply: Regulated, with Adjustable Current Limit and a Pentode Pass Tube (Gately, Forbro, US 3,243,690, 1966)

oleh EdFI

Elektronik

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