A Universal Serial Bus (USB) key may include an optical transceiver having a USB interface for engagement to an electronic device such as a laptop computer or other USB-configured device. The USB key may include a converter or buffering, isolation, modulation or amplification circuitry. The USB key sends and receives data signals which may be carried upon an optical transmission as generated by an LED light source which in turn is in communication with a host device such as a network processor. The USB key may also include operational amplifiers (op-amps) and transistor amplifiers.

A broadband surge suppression module having an optical coupling channel includes a surge protection circuit unit for eliminating or limiting a surge signal from an input digital signal, a light-emitting circuit unit for receiving an output signal of the surge protection circuit unit, converting the output signal into an optical signal, and transmitting the optical signal, a light-receiving circuit unit for receiving the optical signal from the light-emitting circuit unit, a signal restoration circuit unit for restoring a digital signal from an output signal of the light-receiving circuit unit, and a module casing unit for allowing the surge protection circuit unit, the light-emitting circuit unit, the light-receiving circuit unit, and the signal restoration circuit unit to be located therein, the module casing unit being formed to penetrate through an electromagnetic shielding wall for protecting a control system.

A broadband surge suppression module having an optical coupling channel includes a surge protection circuit unit for eliminating or limiting a surge signal from an input digital signal, a light-emitting circuit unit for receiving an output signal of the surge protection circuit unit, converting the output signal into an optical signal, and transmitting the optical signal, a light-receiving circuit unit for receiving the optical signal from the light-emitting circuit unit, a signal restoration circuit unit for restoring a digital signal from an output signal of the light-receiving circuit unit, and a module casing unit for allowing the surge protection circuit unit, the light-emitting circuit unit, the light-receiving circuit unit, and the signal restoration circuit unit to be located therein, the module casing unit being formed to penetrate through an electromagnetic shielding wall for protecting a control system.

The present invention provides a package framework for a photoelectric conversion module, in which a photoelectric device is mounted on a printed circuit board such as a rigid-flex PCB and a HDI (High Density Interconnect) PCB, and then is connected, via a flexible printed circuit board, to a traditional printed circuit board having a driver chip or a digital signal processing integrated circuit disposed thereon. The present invention can prevent signal transmission interference caused by using bond wire, and can also maintain the stability of mechanical structure.

An optical system, an optocoupler, and an isolation device are provided. The disclosed optical system includes at least one photodetector that receives light energy and converts the light energy into one or more electrical signals. The disclosed optical system further includes a comparator module that receives the one or more electrical signals from the at least one photodetector and compares the one or more electrical signals against two different reference values to determine whether a power supply fault condition has occurred for a light source that emitted the light energy and to determine a logic signal conveyed to the at least one photodetector via the light energy emitted by the light source.

An electrical optical isolation circuit and device characterized by a light source, a light-sensitive sensor, and a variable shield between the light source and the light-sensitive sensor, the variable shield being adjustable after assembly of the electrical circuit, and the variable shield adjustment providing attenuation of the electrical circuit output.

A Universal Serial Bus (USB) key may include an optical transceiver having a USB interface for engagement to an electronic device such as a laptop computer or other USB-configured device. The USB key may include a converter or buffering, isolation, modulation or amplification circuitry. The USB key sends and receives data signals which may be carried upon an optical transmission as generated by an LED light source which in turn is in communication with a host device such as a network processor. The USB key may also include operational amplifiers (op-amps) and transistor amplifiers.

A light receiving circuit includes a light receiving element, a first transistor that includes a control terminal which is connected to the light receiving element through a first node, a first terminal and a second terminal, a first load circuit that is connected between a power supply potential and a second node connected to the second terminal, and outputs a voltage signal to a third node, wherein the voltage signal is based on a current signal in the light receiving element, a first feedback resistor that is connected between the first node and the third node, a first limiter circuit that is connected in parallel with the first feedback resistor, and limits an increase of voltage at both ends of the first feedback resistor, and a first circuit that is connected between the second node and the reference potential, includes a second transistor which is diode-connected.

The alignment accuracy between light emitting elements, light receiving elements, and an insulating film is improved. A photocoupling device manufacturing method includes preparing a first lead frame having a first frame part supporting light receiving elements and a second lead frame having a second frame part supporting light emitting elements. The method also includes superposing the first and the second lead frame such that the light receiving elements and the light emitting elements mutually oppose via a first light-transmissive resin covering the light receiving elements, a second light-transmissive resin covering the light emitting elements, and an insulating film sheet positioned between the first and the second light-transmissive resin. The insulating film sheet includes body parts positioned between the light receiving elements and the light emitting elements, joining parts joined to the body parts, and a third frame part fixed between the first and the second frame part.

An apparatus includes a first terminal, a second terminal, a bi-directional regulator circuit, and functional circuitry. The bi-directional regulator circuit generates a voltage across a first power supply node and a second power supply node in response to an input current flowing through the first terminal and the second terminal with a first polarity. The bi-directional regulator circuit also generates the voltage across the first power supply node and the second power supply node in response to the input current flowing through the first terminal and the second terminal with a second polarity opposite the first polarity. The functional circuitry is powered by the voltage and is configured to generate a signal using the voltage. The signal is indicative of the input current in response to the input current being supplied to the first terminal and is indicative of the input current in response to presence of the input current.