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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.
Erfahren
Unknown
Anweisungen
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.
Materialien für diesen Schritt:
Aluminiumgehäuse1 Stück
Anschlussleitung mit Stecker1 Stück
Kippschalter1 Stück
Schmelzsicherung1 Stück
Abwärtstransformator2 Stück
Diode6 rectifiers
Elektrolytkondensator3 filters
Z-Diode2 biasBenötigte Werkzeuge:
Handbohrer
Schraubendreher-Satz2
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.
Materialien für diesen Schritt:
Leistungstransistor1 series pass
Kühlkörper1 StückZ-Diode1 current reference
Regelwiderstand1 current control
Widerstand1 sensing, reference, trim set
Polklemme2 output + and -Benötigte Werkzeuge:
Lötkolben3
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.
Materialien für diesen Schritt:
Z-Diode1 voltage referenceRegelwiderstand1 voltage controlWiderstand1 reference, trim, compensation setBenötigte Werkzeuge:
Lötkolben4
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.
Materialien für diesen Schritt:
Leiterplatte1 Stück
Transistorsortiment1 error amplifiers, cross-over pair, drivers, clampWiderstand1 Set
Potentiometer1 clamp divider
Lötdraht1 as neededBenötigte Werkzeuge:
Lötkolben5
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.
Materialien für diesen Schritt:
Transistorsortiment1 two lamp drivers
Lampenfassung2 Stück
Glühbirne2 StückBenötigte Werkzeuge:
Schraubendreher-SatzMaterialien
19- 1 StückPlatzhalter
- 1 StückPlatzhalter
- Platzhalter
- 1 StückPlatzhalter
- 2 StückPlatzhalter
- 6 rectifiersPlatzhalter
- 3 filtersPlatzhalter
- 1 voltage referencePlatzhalter
- 1 series passPlatzhalter
- 1 StückPlatzhalter
- 1 voltage controlPlatzhalter
- 1 SetPlatzhalter
- Platzhalter
- 1 StückPlatzhalter
- 1 two lamp driversPlatzhalter
- Platzhalter
- 1 as neededPlatzhalter
- 2 StückPlatzhalter
- 2 StückPlatzhalter
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