Example embodiments relate to improved luminaire drivers. One embodiment includes a luminaire driver for driving a light module of a luminaire. The luminaire driver includes a driver housing. The driver housing includes a first and second power supply input connector element, for connection to an electrical distribution grid. The driver housing also includes output connector elements for connection to the light module. The luminaire driver also includes a driver circuitry arranged inside the driver housing, between the first and second power supply input connector elements and the output connector elements. The driver housing is provided with an equipotential connecting part available at an external surface of said driver housing and intended for being connected to an equipotential part of the luminaire. The luminaire driver further includes a resistive circuitry arranged inside the driver housing and connected between the equipotential connecting part and the first power supply input connector element.

Alighting system may include: at least one controller which may be configured to: obtain lighting logging data including feature information related to features of the lighting system and obtained from a plurality of feature spaces; determine lighting prediction data which predicts at least one component failure in the lighting system at a future time in accordance with the lighting logging data and include at least one complex feature; model predicted component failures which are predicted to occur at a future time in accordance with the lighting prediction data and maintenance cost; and/or store the predicted component failures model in a memory.

A voltage adaptable driving signal converter is disclosed, including a rectifying device, a pre-stage energy storing device, a DC-DC conversion device, a post-stage energy storing device, a control conversion device and a switch control device. The rectifying device, the pre-stage energy storing device, the DC-DC conversion device and the post-stage energy storing device are sequentially connected. The pre-stage energy storing device is coupled to a positive electrode of a power supply or to a grounding electrode. The post-stage energy storing device is coupled to and adapted to supply electrical power to a load to be driven. The control conversion device is coupled to the control line and the switch control device respectively. The switch control device is coupled to the post-stage energy storing device and the load respectively. With the above voltage adaptable driving signal, a low-voltage load can be driven by a high-voltage control signal, and a high-voltage load can be driven by a low-voltage control signal, or a load which is not convenient to be made into a high-voltage load can incorporate the voltage adaptable driving signal converter to become a high-voltage load, to achieve the matching between the switch control signal and the load.

A method and system for automatically determining a utility light malfunction is provided. The method includes receiving, from a first hardware device, luminance data specifying current luminance levels associated with utility light apparatuses. Location data specifying a geographical location for each utility light apparatus is retrieved and the luminance data and location data are analyzed with respect to historical luminance data and historical location data associated with the utility light apparatuses. The analysis results in determining that a group of utility light apparatuses include first current luminance levels differing from previous luminance levels of the group. A list and associated map specifying a group of geographical locations associated with the group is generated. A control signal enabling control of a vehicle is transmitted to the vehicle and associated video data is retrieved via the vehicle during travel in accordance with the map.

An LED driver is provided with transient protection circuitry to satisfy dielectric testing requirements. An embodiment of the driver includes a fuse coupled between an AC input and a DC power source, and first and second electrolytic capacitors coupled across the DC power source. Respective circuits including a transient voltage suppressor and a current limiting resistor are coupled in series across each of the electrolytic capacitors. The transient voltage suppressors have breakdown voltage thresholds slightly below a full rated output for the DC source, wherein a sensed short condition across one of the first and second electrolytic capacitors causes a short circuit across the DC source and thereby disabling of the LED driver prior to failure of the other electrolytic capacitor. The current limiting resistors further are configured to avoid causing the LED driver to be disabled for transient overvoltage conditions in which neither of the electrolytic capacitors is shorted.

A street light management method includes: receiving from a server at predetermined intervals and updating at least one of information about a node that is at least one street light, information about a gateway that communicates with the node and the server, and information about a communication channel between the node and the gateway; displaying the node in a corresponding position on a digital map displayed on a screen using position information included in the information about the node and displaying the gateway in a corresponding position on the digital map using position information included in the information about the gateway; and displaying corresponding information in at least one of information display windows on the screen according to the received information or a user operation.

The present invention discloses a system and method for active power factor correction and current regulation in led circuit. The system (100) used in the LED driver circuit performs active PFC and current regulation through the dynamic input current wave shaping by limiting peak currents. The dynamic wave 5 shaping scheme is realized through hardware and firmware and is used to strike an optimal balance between current accuracy, Power factor, THD and peak inductor currents. The system (100) is versatile enough to improve PF and current accuracy in LED circuits and indimmers circuits.

A driver circuit has a driver unit (50) which provides a current for the load (51) based on an input voltage (10) comprising first and second terminals (10a, 10b). The driver unit (50) comprises a linear driver which comprises a current regulating element (Q3) between the input and the load, said element having a controllable resistive characteristic. A compensation unit (52) in series with the driver unit (50) and the input voltage provides a compensating voltage. This is used to control the voltage across the driver unit in dependence on the input voltage and operating conditions of the load. The compensation unit (52) comprises a switch mode power converter and a second capacitor (C2) as an energy source of the switch mode power converter, with the current regulating element (Q3), the load (51) and the second capacitor (C2) in series connection between the first and second terminals (10a, 10b). In this way, the operating range of the driver unit can be reduced to reduce power loss on the driver unit, and the compensating voltage can also be used with an energy harvesting system to increase overall system efficiency.

An apparatus for controlling a light emitting diode (LED) module having a light intensity compensation function includes a light intensity sensor measuring intensity of light irradiated by the LED module depending on a current value, based on a predetermined light intensity signal; a compensation signal generating unit generating a compensated light intensity signal to compensate for an error between measured light intensity and predetermined light intensity; and a pulse width modulation signal generating unit allowing the LED module to irradiate light having uniform brightness in such a manner that a pulse width modulation signal depending on the compensated light intensity signal is applied to an LED driver, in an apparatus for controlling LED lighting including an LED driver.

Various embodiments of methods and systems of proactive monitoring and metering of lighting devices are described herein. A light monitoring and metering system may include a specification database that stores the technical specification of the lighting device, a usage database that records the usage data of the lighting device, a data acquisition subsystem that obtains the identity of the lighting device in use, and a data processing subsystem that meters the usage or calculates the lumen output of the lighting device or the remaining lifetime of the driver of the light device.