When did the power supply industry start?
CURRENTS - VOL. 7, No. 1 The power supply industry dates back to the early 1920s, when crude devices were first developed to serve as "B" battery eliminators to power radios in both the commercial and consumer markets. The market for separate power supplies evaporated around , when most radios manufactured included a built-in power supply.
When did switching power supplies become popular?
In the 1970s, an energy crisis, which affected the entire industrial world, provided the switching power supply with an opportunity to re-surface and establish a significant position in the electronic marketplace. The design and manufacture of switching power supplies can be traced back at least to the 1950s.
What were power supplies schematics like in the early days?
Power supplies schematics were/are like this: In the very early tube days, only the most left schematics was used where the diode was a rectifying tube. Only a half sine is rectified and charging the storage capacitor, causing quite some hum. The transformer is only loaded on the positive sines, so used very inefficiently.
When did a radio need a power supply?
The market for separate power supplies evaporated around , when most radios manufactured included a built-in power supply. The need for stand-alone power supplies remained relatively small in the 1930s and into the 1940s. The dominant technology during this period consisted of vacuum tube linear regulators.
Who invented programmable power supplies?
This same time period also brought us the concept of the first remotely programmable power supplies. A pioneer in this field was Dr. Kenneth Kupferberg, one of the founders of Kepco, who, in his career, was credited with 14 patents. In the 1960s, the world was still analog. Computers were still in their early phase of development.
How do power supplies work?
Power supplies used vacuum tubes for both the power and control elements. Typically, a voltage regulator (VR) tube, the predecessor to today's zener diodes, was used to produce a stable reference. Control was pretty much limited to the manual twisting of knobs. In those days we did not care too much about dissipation.
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