Optocoupler with multiple photodetectors and improved feedback control of LED
First Claim
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1. An optocoupler package, comprising:
- first and second input signal terminals;
first and second output terminals;
third and fourth output terminals;
a layer of dielectric optically semi-reflective and transmissive material having an upper surface and a lower surface;
a light emitting diode (LED) operably connected to the first and second input signal terminals and configured to emit infrared or near-infrared light in proportion to at least one predetermined characteristic of the input signals;
a first photodetector operably connected to the first and second output terminals and configured to provide LED feedback control signals thereacross, anda second photodetector operably connected to the third and fourth output terminals and configured to provide isolated output signals thereacross;
wherein the LED and the first photodetector are both located above the upper surface of the layer of dielectric semi-reflective material, the second photodetector is located beneath the lower surface of the layer of dielectric semi-reflective material, and the layer of dielectric semi-reflective material is configured to reflect a first portion of light generated by the LED and incident upon the upper surface thereof towards the first photodetector thereby to provide the feedback control signals therefrom and to transmit a second portion of light generated by the LED through the upper and lower surfaces thereof for detection by the second photodetector thereby to provide the isolated output signals therefrom.
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Abstract
Various embodiments of methods and devices are provided for an optocoupler comprising a layer of dielectric optically semi-reflective and transmissive material disposed between an LED and a first photodetector located above an upper surface of the layer, and a second photodetector located beneath the lower surface of the layer. The layer reflects a first portion of light generated by the LED towards the first photodetector to generate LED feedback control signals, and transmits a second portion of light generated by the LED through the layer for detection by the second photodetector to generate isolated output signals.
20 Citations
31 Claims
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1. An optocoupler package, comprising:
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first and second input signal terminals; first and second output terminals; third and fourth output terminals; a layer of dielectric optically semi-reflective and transmissive material having an upper surface and a lower surface; a light emitting diode (LED) operably connected to the first and second input signal terminals and configured to emit infrared or near-infrared light in proportion to at least one predetermined characteristic of the input signals; a first photodetector operably connected to the first and second output terminals and configured to provide LED feedback control signals thereacross, and a second photodetector operably connected to the third and fourth output terminals and configured to provide isolated output signals thereacross; wherein the LED and the first photodetector are both located above the upper surface of the layer of dielectric semi-reflective material, the second photodetector is located beneath the lower surface of the layer of dielectric semi-reflective material, and the layer of dielectric semi-reflective material is configured to reflect a first portion of light generated by the LED and incident upon the upper surface thereof towards the first photodetector thereby to provide the feedback control signals therefrom and to transmit a second portion of light generated by the LED through the upper and lower surfaces thereof for detection by the second photodetector thereby to provide the isolated output signals therefrom. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of operating an optocoupler package, comprising:
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providing input signals across first and second input signal terminals of an LED included in the optocoupler package; generating and emitting, on the basis of the input signals, infrared or near-infrared light signals with the LED; reflecting a first portion of light generated by the LED and incident upon an upper surface of a layer of dielectric semi-reflective material towards a first photodetector thereby to generate and provide LED feedback control signals therefrom, the LED and the first photodetector being located above the upper surface; transmitting a second portion of light generated by the LED through the upper surface and an opposing lower surface of the layer of dielectric semi-reflective material towards a second photodetector thereby to generate and provide isolated output signals therefrom, the second photodetector being located beneath the lower surface. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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Specification