Photovoltaic isolator and process of manufacture thereof

Details Photovoltaic isolator and process of manufacture thereof Photovoltaic isolator and process of manufacture thereof

1990-01-29

1991-02-26

Sikes, William L.

H01L 2714, H01L 3100

Patent

active

049965778

ABSTRACT:
A photovoltaic isolator consists of a stack of semiconductor wafers which are alloyed together by an aluminum silicon alloy foil. Each of the wafers consists of a very high resistivity P-type body having P+ and N+ diffusions on its opposite surfaces. The wafers are stacked with the same forward conduction polarity. Individual photoisolator stacks are sliced from the completed stack to any desired dimension. Each individual stack is mounted with a light source, preferably an LED, which is arranged to illuminate the edge of each wafer within the stack. The LED and stack are spaced by about 30 mils so that high dielectric isolation exists between the LED and photovoltaic stack. Energization of the LED will produce a relatively high output short circuit current from the stack and a high output voltage which can turn a power MOSFET on very quickly after the energization of the LED.

REFERENCES:
patent: 4244750 (1981-01-01), Chenevas-Paule et al.
patent: 4255211 (1981-03-01), Fraas
patent: 4256513 (1981-03-01), Yoshida et al.
patent: 4268843 (1981-05-01), Brown et al.
patent: 4409422 (1983-10-01), Sater

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