30 Dec '12, 4pm

Regulate a 0 to 500V, 10-mA power supply in a different way - #Electronic #Engineering #Design #Technology

Regulate a 0 to 500V, 10-mA power supply in a different way - #Electronic #Engineering #Design #Technology

The maximum voltage from a single photodiode working in photovoltaic mode is not sufficient to drive the base; therefore, two photodiodes are connected in series. Photodiodes for infrared light at 870 to 950 nm are used, and two IR LEDs, LD1 and LD2 , illuminate them. The LEDs are standard 5-mm, plastic-encapsulated types. To improve the transfer ratio of the current through the LED versus the current generated by the photodiode, cut off the tops of the LEDs and polish them to form a flat surface. Place the photodiodes in proximity to the surfaces obtained. The transfer ratio of this homemade optocoupler is about 0.05. (The current of 20 mA through the LED causes a current of 1 mA through the photodiode.) Alternatively, you can use a commercially available linear optocoupler—for example, an IL300 , which houses two photodiodes. Its current transfer ratio is only about 0.00...

Full article: http://www.edn.com/design/power-management/4403836/Regula...

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