The present invention refers to an Electrical Power System (EPS) or Power Supply for a smart dimmer for controlling the intensity of illumination of a dimmable lighting load within an electrical installation that has two or three wires in the switch box (two-wire and three-wire switches). The Power Supply is able to detect and control different types of lighting technologies, such as incandescent or LED bulbs. The Power Supply also provides a voltage signal indicating the current consumed by the lighting loads.

An apparatus for supplying power includes a power input, a switch connected to the power input, a load configured to draw power from the power input through the switch, and a switch lock configured to prevent the switch from disconnecting the load from the power input.

A lighting system includes at least one solid state light adapted to replace a lamp in a fluorescent lamp fixture, and a power supply configured to convert power drawn from the fluorescent lamp fixture to power the at least one solid state light. The power supply includes a rectifier, a voltage regulator, a power output for the at least one solid state light, and an auxiliary DC power output. The power supply is configured to generate a regulated DC voltage at the auxiliary DC power output based on the power drawn from the fluorescent lamp fixture.

A two-wire load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) includes a thyristor coupled between the source and the load, a gate coupling circuit coupled between a first main load terminal and the gate of the thyristor, and a control circuit coupled to a control input of the gate coupling circuit. The control circuit generates a drive voltage for causing the gate coupling circuit to conduct a gate current to thus render the thyristor conductive at a firing time during a half cycle of the AC power source, and to allow the gate coupling circuit to conduct the gate current at any time from the firing time through approximately the remainder of the half cycle, where the gate coupling circuit conducts approximately no net average current to render and maintain the thyristor conductive.

The present invention provides an LED lamp and a temperature control circuit applied to the LED lamp. The LED lamp includes at least one LED unit, a magnetic ballast, and an LED drive circuit. The magnetic ballast is coupled to a power and configured to limit and stabilize a received alternating current. The LED drive circuit includes a temperature control circuit. The temperature control circuit is coupled to the magnetic ballast and connected in parallel with the LED unit, is configured to detect an internal temperature of the LED lamp and adjust an output power of the LED unit, and includes a thermal sensitive module having a negative temperature coefficient thermistor and a phase cut circuit. The phase cut circuit is coupled to the thermal sensitive module, and adjusts the output power of the LED unit by decreasing a resistance of the negative temperature coefficient thermistor when the negative temperature coefficient thermistor detects that the internal temperature of the LED lamp is higher than a specified temperature threshold.

A microcontroller receives a LINE SYNC signal and a dimmer control voltage input and controls output switch timing of an output FET switch to generate a reverse phase PWM dimming signal for supply to associated LED driver apparatus.

A lighting system includes a solid state luminaire configured to be mounted to provide task lighting to at least one area, a user interface configured to accept lighting settings for the lighting system, and a user interface configured to enable at least one of the solid state luminaire and an area light source to be controlled to provide a desired illumination level to a workspace, wherein the solid state luminaire and the area light source both illuminate the workspace.

A circuit comprising a controller (2) for controlling a pulse width modulated input signal, and a driver (4) configured to supply current to a load (6) based on the input signal, wherein over the on time of each pulse width modulation period the driver (4) supplies current to the load (6) with a second frequency that is greater than the first frequency. The controller (2) is configured to control the duty cycle to set the output of the load (6) to a desired output level, and to dither the duty cycle about a point corresponding to the desired output level.

A two-wire load control device (such as, a dimmer switch) for controlling the amount of power delivered from an AC power source to an electrical load (such as, a high-efficiency lighting load) includes a thyristor coupled between the source and the load, a gate coupling circuit coupled between a first main load terminal and the gate of the thyristor, and a control circuit coupled to a control input of the gate coupling circuit. The control circuit generates a drive voltage for causing the gate coupling circuit to conduct a gate current to thus render the thyristor conductive at a firing time during a half cycle of the AC power source, and to allow the gate coupling circuit to conduct the gate current at any time from the firing time through approximately the remainder of the half cycle, where the gate coupling circuit conducts approximately no net average current to render and maintain the thyristor conductive.

A trailing edge phase control dimmer circuit for controlling alternating current (AC) power to a load, the circuit including: a switching circuit for controlling delivery of AC power to the load by conducting power to the load in an ON state and not conducting power to the load in an OFF state; and a switching control circuit for controlling turn-OFF and turn-ON of the switching circuit at each cycle of the AC to control switching of the ON and OFF states of the switching circuit, wherein the switching control circuit controlling turn-OFF of the switching circuit includes controlling a turn-OFF transition of the switching circuit between the ON state and the OFF state of the switching circuit extending for a selected turn-OFF transition time, and wherein the switching control circuit further includes a dv/dt feedback circuit for controlling a turn-OFF transition profile indicative of a drain voltage of the switching circuit of the turn-OFF transition and the selected turn-OFF transition time by returning at least some dv/dt feedback current generated by the switching circuit back to the switching circuit, whereby the dv/dt feedback circuit is configured to control said at least some dv/dt feedback current over the turn-OFF transition so as to reduce a rate of change of at least an initial region of the turn-OFF transition profile to minimize harmonics generation by the switching circuit.