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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.
高级
Unknown
说明
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.
此步骤所需材料：
铝制外壳盒1 个
带插头软线1 个
钮子开关1 个
保险丝1 个
降压变压器2 个
二极管6 rectifiers
电解电容器3 filters
齐纳二极管2 bias所需工具：
手摇钻
螺丝刀套装2
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.
此步骤所需材料：
功率晶体管1 series pass
散热器1 个齐纳二极管1 current reference
变阻器1 current control
电阻1 sensing, reference, trim set
接线柱2 output + and -所需工具：
电烙铁3
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.
此步骤所需材料：
齐纳二极管1 voltage reference变阻器1 voltage control电阻1 reference, trim, compensation set所需工具：
电烙铁4
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.
此步骤所需材料：
印制电路板1 个
晶体管组合1 error amplifiers, cross-over pair, drivers, clamp电阻1 套
电位器1 clamp divider
焊锡丝1 as needed所需工具：
电烙铁5
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.
此步骤所需材料：
晶体管组合1 two lamp drivers
灯座2 个
灯泡2 个所需工具：
螺丝刀套装材料
19- 1 个占位符
- 1 个占位符
- 占位符
- 1 个占位符
- 2 个占位符
- 6 rectifiers占位符
- 3 filters占位符
- 1 voltage reference占位符
- 1 series pass占位符
- 1 个占位符
- 1 voltage control占位符
- 1 套占位符
- 占位符
- 1 个占位符
- 1 two lamp drivers占位符
- 占位符
- 1 as needed占位符
- 2 个占位符
- 2 个占位符
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