A solid state lighting system includes a number of light sources with multiple light colors that can be used to replace fluorescent lamps.

Example embodiments relate to a communication device. One example communication device includes a communication module, an energy storage module, a power cutoff detection module, a processor, and a memory. The communication device is adapted to connect to a power grid for receiving power. The processor is adapted to operate the communication device in a normal mode when connected to the power grid. The power cutoff detection module is adapted to signal to the processor a cutoff from the power grid. The processor is adapted to operate the communication device in power cutoff mode using energy in the energy storage module after receipt of the signal of the power cutoff detection module. The processor is adapted, in power cutoff mode, to determine an amount of energy in the energy storage module and to store a value indicative of the amount in the memory.

Example embodiments relate to a communication device. One example communication device includes a communication module, an energy storage module, a power cutoff detection module, a processor, and a memory. The communication device is adapted to connect to a power grid for receiving power. The processor is adapted to operate the communication device in a normal mode when connected to the power grid. The power cutoff detection module is adapted to signal to the processor a cutoff from the power grid. The processor is adapted to operate the communication device in power cutoff mode using energy in the energy storage module after receipt of the signal of the power cutoff detection module. The processor is adapted, in power cutoff mode, to determine an amount of energy in the energy storage module and to store a value indicative of the amount in the memory.

The present invention provides a dimmable lighting apparatus, comprising a light emitting circuit and a driving circuit coupled with the light emitting circuit. The driving circuit comprises a rectifier module, a filtering module coupled between the light emitting circuit and the rectifier module, a constant current module coupled between the filtering module and the light emitting circuit, and a dimming module. In particular, the dimming module is configured to receive a driving signal supplied to the light emitting circuit from the constant current module, and feed the driving signal back to the constant current module to adjust an output power of the constant current module.

A small cell networking device mountable to a streetlight fixture includes circuitry for converting alternating current power into direct current (DC) power and providing a digitally stable ground for operation of the small cell device. The circuitry includes a transformer isolating a primary side from a secondary side of the circuitry. A switching controller on the primary side directs a switching circuit to selectively permit current flow through a primary side of the transformer to a first ground node on the primary side. A secondary winding of the transformer sources a rectified DC output relative to a second ground node that is isolated from the first ground node. In some cases, compensation on the secondary winding side provides isolated feedback to the controller, such as via an optical isolator. The controller directs the switching circuit based at least on the feedback and input from an auxiliary winding of the transformer.

An AC-DC power supply receives input AC power and outputs DC power. The converter includes a high power factor bridge rectifier, a barrier circuit with resistor(s) and capacitor(s), and a step-down switching DC-DC converter to step-down a first DC voltage to a second, lower, DC voltage for output. Additionally, fault-protection is provided by redundancy in diodes on diode legs of a bridge rectifier and capacitor(s) of a filter circuit thereof, and a fault-protection circuit to sense current from a step-down switching DC-DC converter, a first voltage from the step-down switching DC-DC converter, and/or a second voltage at an output of the step-down switching DC-DC converter, and open the circuit on a fault.

An AC-DC power supply receives input AC power and outputs DC power. The converter includes a high power factor bridge rectifier, a barrier circuit with resistor(s) and capacitor(s), and a step-down switching DC-DC converter to step-down a first DC voltage to a second, lower, DC voltage for output. Additionally, fault-protection is provided by redundancy in diodes on diode legs of a bridge rectifier and capacitor(s) of a filter circuit thereof, and a fault-protection circuit to sense current from a step-down switching DC-DC converter, a first voltage from the step-down switching DC-DC converter, and/or a second voltage at an output of the step-down switching DC-DC converter, and open the circuit on a fault.

This disclosure relates to a LED driving circuit compatible with an electronic ballast and an electronic supply, and a LED lamp, which include a first input terminal receiving an alternating current, a second input terminal, a buck circuit connected with the first input terminal and the second input terminal, a rectifier circuit connected with the buck circuit, a leakage current limit circuit connected with the rectifier circuit, a constant current output circuit connected with the leakage current limit circuit, a signal sample circuit connected with the second input terminal and the leakage current limit circuit, and a switch connected with the leakage current limit circuit. When a high frequency voltage outputted by the connected electronic ballast is automatically depressed for protecting subsequent circuits, when connecting the electronic supply, it is satisfied with a single terminal and double terminals connecting a power, and the double terminals pass a leakage current test.

A lighting apparatus includes a first electrode, a second electrode, a lighting source, a rectifier, a driver and an electric shock prevention circuit. The first electrode and the second electrode receive an external power source. The external power source is either an alternating current or a direct current. The light source has multiple LED modules. The rectifier is used for rectifying the external power source to a rectified power. The driver is used for converting the rectified power to a driving current supplying to the light source.

A circuit board arrangement assembled by at least a first and a second circuit boards, each circuit board comprising: a portion of a circuit; and a first and a second electrical terminals to be electrically connected to a respective first and a second electrical terminals of the other circuit board of the first and the second circuit boards, so as to couple the portions of the circuit of the first and the second circuit boards, wherein the first and second electrical terminals on the circuit board are coupled with each other via the portion of the circuit on the other circuit board of the first and the second circuit boards, at least one board further comprising: a voltage suppression element (TSS1, TSS2) in the board connected across the first and second electrical terminals of the board, said voltage suppression element (TSS1, TSS2) is adapted to become conductive when a voltage thereacross reaches a threshold; characterized in that the portion of the circuit comprising at least one LED, and said LED (LED1) of the first circuit board (B1) and said LED (LED4) of the second circuit board (B2) are forwarded in the same direction and to be series connected between a first interconnection (LED+) of the first electrical terminals of the first and the second circuit boards and a second interconnection (LED−) of the second electrical terminal of the first and the second circuit boards. The voltage suppression element is able to prevent overvoltage/arcing due to a disconnection of the series connection of the LEDs of the first and second circuit boards, as well as a disconnection of a interconnection of first terminals, and a interconnection of the second terminals.