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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.
高级
Unknown
说明
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.
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1 个
二极管2 个
晶闸管（SCR）2 个
滤波扼流圈1 个
电解电容器2 个
接线柱2 output + and -所需工具：
手摇钻
螺丝刀套装2
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.
此步骤所需材料：
齐纳二极管2 个
变阻器2 voltage and current controls
电阻1 sensing and bridge resistors所需工具：
电烙铁3
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.
此步骤所需材料：
印制电路板1 个
晶体管组合1 amplifiers
未知材料1 OR gate and firing-angle circuit
焊锡丝1 as needed所需工具：
电烙铁材料
17- 1 个占位符
- 1 个占位符
- 占位符
- 1 个占位符
- 1 个占位符
- 2 个占位符
- 2 个占位符
- 1 个占位符
- 2 个占位符
- 占位符
- 2 个占位符
- 2 voltage and current controls占位符
- 1 sensing and bridge resistors占位符
- 1 个占位符
- 1 amplifiers占位符
- 1 OR gate and firing-angle circuit占位符
- 1 as needed占位符
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