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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.
Lanjutan
Unknown
Arahan
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.
Bahan untuk langkah ini:
Kotak kalis aluminium1 keping
Kord fleksibel berpalam1 keping
Suis togol1 keping
Fius1 keping
Transformer Penurun2 keping
Diod6 rectifiers
Kapasitor elektrolitik3 filters
Diod Zener2 biasAlatan diperlukan:
Gerimit tangan
Set pemutar skru2
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.
Bahan untuk langkah ini:
Transistor kuasa1 series pass
Penyerap haba1 kepingDiod Zener1 current reference
Reostat1 current control
Rintangan1 sensing, reference, trim set
Tiang pengikat2 output + and -Alatan diperlukan:
Alat pematerian3
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.
Bahan untuk langkah ini:
Diod Zener1 voltage referenceReostat1 voltage controlRintangan1 reference, trim, compensation setAlatan diperlukan:
Alat pematerian4
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.
Bahan untuk langkah ini:
Papan litar bercetak1 keping
Pelbagai transistor1 error amplifiers, cross-over pair, drivers, clampRintangan1 set
Potensiometer1 clamp divider
Dawai Pateri1 as neededAlatan diperlukan:
Alat pematerian5
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.
Bahan untuk langkah ini:
Pelbagai transistor1 two lamp drivers
Pemegang mentol2 keping
Mentol lampu2 kepingAlatan diperlukan:
Set pemutar skruBahan
19- 1 kepingPemegang Tempat
- 1 kepingPemegang Tempat
- Pemegang Tempat
- 1 kepingPemegang Tempat
- 2 kepingPemegang Tempat
- 6 rectifiersPemegang Tempat
- 3 filtersPemegang Tempat
- 1 voltage referencePemegang Tempat
- 1 series passPemegang Tempat
- 1 kepingPemegang Tempat
- 1 voltage controlPemegang Tempat
- 1 setPemegang Tempat
- Pemegang Tempat
- 1 kepingPemegang Tempat
- 1 two lamp driversPemegang Tempat
- Pemegang Tempat
- 1 as neededPemegang Tempat
- 2 kepingPemegang Tempat
- 2 kepingPemegang Tempat
Alatan Diperlukan
3- Pemegang Tempat
- Pemegang Tempat
- 2 vendors sell this, none ship to you yetPemegang Tempat
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