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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.
Abantado
Unknown
Mga Tagubilin
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.
Mga materyales para sa hakbang na ito:
Kahon na aluminyo1 piraso
Malambot na kordon na may plug1 piraso
Toggle na switch1 piraso
Piyus1 piraso
Step-Down Transformer1 piraso
Diode2 piraso
Tiristor (SCR)2 piraso
Filter choke1 piraso
Electrolytic capacitor2 piraso
Binding post2 output + and -Mga kailangang kasangkapan:
Barenang de-kamay
Set ng mga distornilyador2
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.
Mga materyales para sa hakbang na ito:
Zener diode2 piraso
Rheostat2 voltage and current controls
Resistensya1 sensing and bridge resistorsMga kailangang kasangkapan:
Panghinang3
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.
Mga materyales para sa hakbang na ito:
Printed circuit board (PCB)1 piraso
Sari-saring transistor1 amplifiers
Hindi kilalang materyal1 OR gate and firing-angle circuit
Kawad na Panghinang1 as neededMga kailangang kasangkapan:
PanghinangMga Materyales
17- 1 pirasoPlaceholder
- 1 pirasoPlaceholder
- Placeholder
- 1 pirasoPlaceholder
- 1 pirasoPlaceholder
- 2 pirasoPlaceholder
- 2 pirasoPlaceholder
- 1 pirasoPlaceholder
- 2 pirasoPlaceholder
- Placeholder
- 2 pirasoPlaceholder
- 2 voltage and current controlsPlaceholder
- 1 sensing and bridge resistorsPlaceholder
- 1 pirasoPlaceholder
- 1 amplifiersPlaceholder
- 1 OR gate and firing-angle circuitPlaceholder
- 1 as neededPlaceholder
Mga Kinakailangang Kasangkapan
3- Placeholder
- Placeholder
- 2 vendors sell this, none ship to you yetPlaceholder
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