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FEGURÐ OG VELLÍÐAN
HANDVERK
MENNING OG SAGA
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UMHVERFI
MATUR OG DRYKKUR
ÖFUGVERKFRÆÐI
VÍSINDI
ÍÞRÓTTIR
TÆKNI
KLÆÐANLEG TÆKNI
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.
Lengra kominn
Unknown
Leiðbeiningar
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.
Efni fyrir þetta skref:
Álkassi1 stykki
Sveigjanleg snúra með kló1 stykki
Stangarrofi1 stykki
Vartappi1 stykki
Niðurstigsspennir1 stykki
Díóða2 stykki
Þýristor (SCR)2 stykki
Síuspóla1 stykki
Rafgreiningarþéttir2 stykki
Tengipóstur2 output + and -Nauðsynleg verkfæri:
Handbor
Skrúfjárnasett2
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.
Efni fyrir þetta skref:
Zener-díóða2 stykki
Stilliviðnám2 voltage and current controls
Viðnám1 sensing and bridge resistorsNauðsynleg verkfæri:
Lóðbolti3
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.
Efni fyrir þetta skref:
Prentplata1 stykki
Smárasúrval1 amplifiers
Óþekktur efniviður1 OR gate and firing-angle circuit
Lóðtinsvír1 as neededNauðsynleg verkfæri:
LóðboltiEfni
17- 1 stykkiStaðgengill
- 1 stykkiStaðgengill
- frá$3.53
- 1 stykkiStaðgengill
- 1 stykkiStaðgengill
- 2 stykkiStaðgengill
- 2 stykkiStaðgengill
- 1 stykkiStaðgengill
- 2 stykkiStaðgengill
- frá$0.51
- 2 stykkiStaðgengill
- 2 voltage and current controlsStaðgengill
- 1 sensing and bridge resistorsStaðgengill
- 1 stykkiStaðgengill
- 1 amplifiersStaðgengill
- 1 OR gate and firing-angle circuitStaðgengill
- 1 as neededStaðgengill
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CC0 opinbert ríki
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