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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.
Abantado
Unknown
Mga Tagubilin
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.
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 Transformer2 piraso
Diode6 rectifiers
Electrolytic capacitor3 filters
Zener diode2 biasMga kailangang kasangkapan:
Barenang de-kamay
Set ng mga distornilyador2
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.
Mga materyales para sa hakbang na ito:
Power transistor1 series pass
Heat sink1 pirasoZener diode1 current reference
Rheostat1 current control
Resistensya1 sensing, reference, trim set
Binding post2 output + and -Mga kailangang kasangkapan:
Panghinang3
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.
Mga materyales para sa hakbang na ito:
Zener diode1 voltage referenceRheostat1 voltage controlResistensya1 reference, trim, compensation setMga kailangang kasangkapan:
Panghinang4
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.
Mga materyales para sa hakbang na ito:
Printed circuit board (PCB)1 piraso
Sari-saring transistor1 error amplifiers, cross-over pair, drivers, clampResistensya1 set
Potensiyometro1 clamp divider
Kawad na Panghinang1 as neededMga kailangang kasangkapan:
Panghinang5
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.
Mga materyales para sa hakbang na ito:
Sari-saring transistor1 two lamp drivers
Sokete ng bombilya2 piraso
Bombilya2 pirasoMga kailangang kasangkapan:
Set ng mga distornilyadorMga Materyales
19- 1 pirasoPlaceholder
- 1 pirasoPlaceholder
- Placeholder
- 1 pirasoPlaceholder
- 2 pirasoPlaceholder
- 6 rectifiersPlaceholder
- 3 filtersPlaceholder
- 1 voltage referencePlaceholder
- 1 series passPlaceholder
- 1 pirasoPlaceholder
- 1 voltage controlPlaceholder
- 1 setPlaceholder
- Placeholder
- 1 pirasoPlaceholder
- 1 two lamp driversPlaceholder
- Placeholder
- 1 as neededPlaceholder
- 2 pirasoPlaceholder
- 2 pirasoPlaceholder
Mga Kinakailangang Kasangkapan
3- Placeholder
- Placeholder
- 2 vendors sell this, none ship to you yetPlaceholder
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