Detection of optical light power
AssigneeDaimler AG
InventorsUlrich Ensslin, Bärbel Gaiser
Life of this patent
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Abstract
A receiving unit for a controller for reception of input data is disclosed. The input data is transmitted as optical signals in an optical bus system in a vehicle. The receiving unit is coupled to an optical bus system and has a means for conversion of optical signals to electrical signals. A measurement arrangement is provided which measures a characteristic variable for the optical received power. The receiving unit optimizes the dynamic control of the optical level. The measurement arrangement is in the form of a digital circuit. Furthermore, an output port is provided for passing on the digitized measurement data.
Claims13
A receiving unit for a controller for reception of input data which is transmitted in the form of optical signals in an optical bus system in a vehicle, the receiving unit coupled to an optical bus system and comprising a means for conversion of optical signals to electrical signals, wherein the receiving unit and/or the controller includes a measurement arrangement which measures a characteristic variable of the optical received power and generates digitized measurement data, and an output port for passing on the digitized measurement data, a means for determination of the optical received power which has a memory means in which a characteristic is stored, the stored characteristic represents the relationship between the measured characteristic variable and the corresponding optical received power, and wherein the means for determination of the optical received power has an evaluation unit which compares the measured characteristic variable with the characteristic and passes on the determined optical received power to the output port.
A controller, comprising:
- a transmitting/receiving unit that includes a transmitting unit and a receiving unit, the transmitting/receiving unit coupling the controller to an optical bus system in a vehicle, the controller interchanging data using the transmitting/receiving unit via the optical bus system in the form of optical signals, the receiving unit for reception of input data, the receiving unit having a means for conversion of optical signals to electrical signals and having a measurement arrangement which measures a characteristic variable for the optical received power and generates digitized measurement data, the transmitting unit having means for conversion of electrical signals to optical signals for transmission of optical signals to the optical bus system;
- a communication controller with means for conversion of data in accordance with a bus protocol, the receiving unit and the transmitting unit being connected to the communication controller via a respective signal line;
- a microcontroller which is connected via signal lines for reception and transmission of data to the communication controller, wherein the receiving unit has an output port for passing on the digitized measurement data to the communication controller and/or microcontroller;
- a means for determination of the optical received power, which means has a memory means in which a characteristic is stored which represents the relationship between the measured characteristic variable and the corresponding optical received power;
- an evaluation unit which compares the measured characteristic variable with the characteristic, wherein the means for determination and the evaluation unit are components of at least one of the microcontroller and receiving unit;
- and
- a means for controlling the received light power of the receiving photodiode, which uses the transmission unit to transmit to the optical bus system a signal for controlling the light power to the transmitter of the optical power as a function of the discrepancy between the determined optical received power and the received power at an ideal operating point of the receiving photodiode.
A controller, comprising:
- a transmitting/receiving unit that includes a transmitting unit and a receiving unit, the transmitting/receiving unit coupling the controller to an optical bus system in a vehicle, the controller interchanging data packets using the transmitting/receiving unit via the optical bus system in the form of optical signals, the receiving unit for reception of data packets, the receiving unit having a means for conversion of optical signals, corresponding to the data packets, to electrical signals and having a measurement arrangement which measures a characteristic variable for the optical received power and generates digitized measurement data, the transmitting unit having means for conversion of electrical signals to optical signals for transmission of optical signals to the optical bus system;
- a communication controller with means for conversion of data in accordance with a bus protocol, the receiving unit and the transmitting unit being connected to the communication controller via a respective signal line;
- a microcontroller which is connected via signal lines for reception and transmission of data to the communication controller, wherein the receiving unit has an output port for passing on the digitized measurement data to the communication controller and/or microcontroller, the microcontroller comprising
- a means for determination of the optical received power, which means has a memory means in which a characteristic is stored which represents the relationship between the measured characteristic variable and the corresponding optical received power;
- and
- a means for controlling the received light power of the receiving photodiode, which uses the transmission unit to transmit to a transmitter of the data packets, by way of the optical bus system, a signal for controlling the light power of the optical power transmitted by the transmitter as a function of the discrepancy between the determined optical received power and the received power at an ideal operating point of the receiving photodiode.
Dependencies are inferred from the claim text.