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.

An apparatus for extending the lifetime of an LED device is provided. In some embodiments, the apparatus includes an LED printed circuit board (PCB) having two or more LED circuits thereon, where each of the two or more LED circuits includes a plurality of LED emitters. The apparatus further includes a module electrically coupled to the LED PCB that has a selector configured to move between two or more positions, each position activating one of the one or more LED circuits and a relay configured to control a movement of the selector between the two or more positions based on a received input. Additionally, the apparatus includes a power supply that is electrically coupled to the relay.

An apparatus for extending the lifetime of an LED device is provided. In some embodiments, the apparatus includes an LED printed circuit board (PCB) having two or more LED circuits thereon, where each of the two or more LED circuits includes a plurality of LED emitters. The apparatus further includes a module electrically coupled to the LED PCB that has a selector configured to move between two or more positions, each position activating one of the one or more LED circuits and a relay configured to control a movement of the selector between the two or more positions based on a received input. Additionally, the apparatus includes a power supply that is electrically coupled to the relay.

A discrete component linear circuit of a line is provided, including a switch S1, a fuse F1, a varistor MOV1, a rectifier DB1, a triode Q1 to a triode Q6, and a resistor R1 to a resistor R6, wherein an input end of the switch S1 is connected to an input end L of a power supply for input, and an output end of the switch S1 is connected to an input end of the fuse F1. When an input voltage increases, a current increases, and resistance values of a thermistor T1, a thermistor T2 and a thermistor T3 increase due to temperature rise. The resistance increases synchronously when the voltage increases, so that the current is maintained in a relatively stable interval. Therefore, the voltage bearing capacity when an LED lamp works is increased, and more LED lamps may be used in parallel.

A discrete component linear circuit of a line is provided, including a switch S1, a fuse F1, a varistor MOV1, a rectifier DB1, a triode Q1 to a triode Q6, and a resistor R1 to a resistor R6, wherein an input end of the switch S1 is connected to an input end L of a power supply for input, and an output end of the switch S1 is connected to an input end of the fuse F1. When an input voltage increases, a current increases, and resistance values of a thermistor T1, a thermistor T2 and a thermistor T3 increase due to temperature rise. The resistance increases synchronously when the voltage increases, so that the current is maintained in a relatively stable interval. Therefore, the voltage bearing capacity when an LED lamp works is increased, and more LED lamps may be used in parallel.

An LED arrangement having a LED string and a smoothing capacitor connected in parallel. A controllable voltage limiter is able to limit a voltage across the LED string to selectively prevent the LED string from outputting light. As the LED arrangement is turned ON, the controllable voltage limiter may activate so that the smoothing capacitor can be charged with a high current without activating the LED string.

An LED arrangement having a LED string and a smoothing capacitor connected in parallel. A controllable voltage limiter is able to limit a voltage across the LED string to selectively prevent the LED string from outputting light. As the LED arrangement is turned ON, the controllable voltage limiter may activate so that the smoothing capacitor can be charged with a high current without activating the LED string.

A source circuit, a power supply and an electric system. The source circuit includes at least one voltage source supplied from a mains circuit and used to provide at least one voltage for at least one device and at least one switch respectively connected to the at least one voltage source and controlled to be turned on according to a voltage of the mains circuit and/or at a timing after the mains circuit being applied corresponding to the device.

A Light Emitting Diode, LED, based lighting device arranged to emit colored light, wherein said LED based lighting device comprises a first LED channel comprising at least one LED arranged for emitting light at a first color, a second LED channel comprising at least one LED arranged for emitting light at a second color, said second color being different to said first color, a controller arranged for activating said first LED channel and said second LED channel based on a color ratio such that said LED based lighting device emits light having a particular color, wherein said controller is further arranged for correcting said color ratio based on aging of said at least one LED in said first LED channel and on said at least one LED in said second LED channel, thereby ensuring color consistency of said particular color of said LED based lighting device over time.