Optically isolated signal coupler with linear response
First Claim
1. Apparatus for optically isolating electric signals, said apparatus for use with an electrical input system and an electrical output system, said apparatus comprising:
- a light emitting diode made of silicon carbide, said light emitting diode responsive to electric input signals from said input system and converting said electric input signals to light signals; and
means in spaced relationship to said light emitting diode for receiving light, said light receiving means responsive to said light signals and converting said light signals to electrical output signals, said electric output signals proportional to said electric input signals, said light receiving means in electrical communication with said output system.
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Accused Products
Abstract
An optocoupler for isolating electrical signals that translates an electrical input signal linearly to an electrical output signal. The optocoupler comprises a light emitter, a light receiver, and a light transmitting medium. The light emitter, preferably a blue, silicon carbide LED, is of the type that provides linear, electro-optical conversion of electrical signals within a narrow wavelength range. Correspondingly, the light receiver, which converts light signals to electrical signals and is preferably a cadmium sulfide photoconductor, is linearly responsive to light signals within substantially the same wavelength range as the blue LED.
32 Citations
18 Claims
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1. Apparatus for optically isolating electric signals, said apparatus for use with an electrical input system and an electrical output system, said apparatus comprising:
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a light emitting diode made of silicon carbide, said light emitting diode responsive to electric input signals from said input system and converting said electric input signals to light signals; and means in spaced relationship to said light emitting diode for receiving light, said light receiving means responsive to said light signals and converting said light signals to electrical output signals, said electric output signals proportional to said electric input signals, said light receiving means in electrical communication with said output system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An optocoupler for isolating electrical signals between an electrical input system and an electrical output system, said apparatus comprising:
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a blue light emitting diode made of silicon carbide, said light emitting diode responsive to input signals from said input system and converting said input signals to light signals having an intensity and a wavelength within the range from approximately 415 nanometers to approximately 565 nanometers; a photoconductive cell in spaced relationship to said light emitting diode, said photoconductive cell made of cadmium sulfide and linearly responsive to said intensity of said light signals having a wavelength of no more than approximately 513 nanometers and converting said light signals to electrical output signals, said electric output signals proportional to said electric input signals, said photoconductive cell in electrical communication with said output system; and means for transmitting light between said light emitting diode and said photoconductive cell, said light transmitting means in optical communication with said light emitting diode and said photoconductive cell and positioned therebetween. - View Dependent Claims (15, 16, 17, 18)
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Specification