A fault diagnosis device is configured to diagnose a fault in a light emitting unit that emits light of a color according to an operating state of a robot by individually energizing and lighting a plurality of types of LEDs of different emission colors. The fault diagnosis device includes an energization control unit that controls energization of the LEDs, a voltage detection unit that detects a diagnostic voltage that varies depending on a terminal voltage of the LEDs, and a fault detection unit that detects a fault in the light emitting unit based on a control state of energization by the energization control unit and a detected value of the diagnostic voltage by the voltage detection unit.

A fault diagnosis device is configured to diagnose a fault in a light emitting unit that emits light of a color according to an operating state of a robot by individually energizing and lighting a plurality of types of LEDs of different emission colors. The fault diagnosis device includes an energization control unit that controls energization of the LEDs, a voltage detection unit that detects a diagnostic voltage that varies depending on a terminal voltage of the LEDs, and a fault detection unit that detects a fault in the light emitting unit based on a control state of energization by the energization control unit and a detected value of the diagnostic voltage by the voltage detection unit.

There is provided a production management apparatus including: a memory section configured to memorize component data in which ranks of LED components stored in the stocker are associated with identification information of the LED components; a rank input section configured to accept a rank of the LED component in the LED components of the multiple types as a designated rank, the LED component being used in producing the board product; and a component group generating section configured to generate a component group into which the LED components of the multiple ranks including the designated rank are combined so as to satisfy a required specification of the board product, based on the ranks of the LED components which are included in the component data.

There is provided a production management apparatus including: a memory section configured to memorize component data in which ranks of LED components stored in the stocker are associated with identification information of the LED components; a rank input section configured to accept a rank of the LED component in the LED components of the multiple types as a designated rank, the LED component being used in producing the board product; and a component group generating section configured to generate a component group into which the LED components of the multiple ranks including the designated rank are combined so as to satisfy a required specification of the board product, based on the ranks of the LED components which are included in the component data.

A controller circuit for a set of light emitting diodes (LEDs) includes a linear current source, channel circuitry, and supervisor circuitry. The linear current source is configured to regulate a first current from a supply along a first series path to the set of LEDs. The channel circuitry is configured to control a second current from the supply along a second series path to the set of LEDs, the second series path being in parallel with the first series path and the second series path comprising a drop element coupled in series with the supply and the set of LEDs. The supervisor circuitry is configured to regulate a total current supplied to the set of LEDs using the linear current source and the channel circuitry, the total current comprising the first current and the second current.

A LED driver having a current sensing resistor arrangement with two parallel current sensing branches, each comprising at least two series resistors connected at a respective sensing node. The voltages at the two sensing nodes are processed to detect a component failure. The normal current control is based on the voltage across the overall resistor arrangement.

A LED driver having a current sensing resistor arrangement with two parallel current sensing branches, each comprising at least two series resistors connected at a respective sensing node. The voltages at the two sensing nodes are processed to detect a component failure. The normal current control is based on the voltage across the overall resistor arrangement.

Provided is a buck-boost converting circuit including an LED current regulator and bypass switches. The buck-boost converting circuit includes switches coupled in a matrix form in order to individually control a plurality of LEDs connected in series, an LED current regulator, and a circuit capable of buck-boost conversion.

Provided is a buck-boost converting circuit including an LED current regulator and bypass switches. The buck-boost converting circuit includes switches coupled in a matrix form in order to individually control a plurality of LEDs connected in series, an LED current regulator, and a circuit capable of buck-boost conversion.

An apparatus for powering a light-emitting diode (LED) is provided including: a circuit board having an input portion, a power portion, a protection portion, and an output portion; the input portion of the circuit board including an alternating current line and a neutral current line, where the alternating current received across the alternating current line and neutral line supply two distinct, alternative paths, where each of the two distinct alternative paths include a combination of capacitors, inductors, and rectifiers to mitigate signal noise; the power portion of the circuit configured to receive power from the input portion of the circuit along the two distinct, alternative paths, to regulate the current received from the two distinct, alternative paths, and to provide power to an LED driver; and the protection portion of the circuit may be configured to mitigate voltage surges and to regulate the voltage supplied to the LED driver.