A light emitting diode (LED) control device includes: a power supply connected to a first driving node and a second driving node of an LED driver configured to provide driving power to a light source including a plurality of LEDs; a controller configured to operate by a first internal power voltage output from the power supply, and receive a control command from an external controller; and a switching device connected to the second driving node, and configured to operate by a second internal power voltage output from the power supply and control brightness of the light source based on a control signal which is output from the controller in response to the control command.

Provided are an LED flame bulb and a light string, the LED flame bulb including an LED light strip and a light strip control component, the light strip comprises a substrate and a plurality of LED beads. The substrate is divided into a flame bottom area, a flame core area and an outer flame area in order from one end to the other end, and the plurality of LED beads are arranged in the flame bottom area, the flame core area and the outer flame area; at least 2 LED beads are arranged in the flame core area; the light strip control component controls the LED beads in the flame bottom area and the outer flame area to be on and off at a set frequency, and controls the LED beads in the flame core area to be on and off in sequence.

An LED lamp (1) for use in a luminaire (2), the LED lamp (1) comprising a plurality of LEDs (14) connected in a plurality of groups (15, 16); one or more rectifier circuits (10, 10a, 10b) adapted for rectifying an electrical current received from the luminaire (2) for supply to the LEDs (14); a first control circuit (24) adapted to estimate electrical current or electrical power received by or used by the LED lamp (1), and adapted to generate an output on the basis of the estimate; and a switching circuit (20) comprising a first switch (21) for switching the plurality of groups of LEDs (15, 16) between a plurality of different circuit configurations at a switching frequency of at least 300 kHz and according to a duty cycle; wherein the switching circuit (20) is configured to adjust the duty cycle in dependence on the output of the first control circuit (24) to adjust the electrical power used by the LED lamp (1).

An LED lamp (1) for use in a luminaire (2), the LED lamp (1) comprising a plurality of LEDs (14) connected in a plurality of groups (15, 16); one or more rectifier circuits (10, 10a, 10b) adapted for rectifying an electrical current received from the luminaire (2) for supply to the LEDs (14); a first control circuit (24) adapted to estimate electrical current or electrical power received by or used by the LED lamp (1), and adapted to generate an output on the basis of the estimate; and a switching circuit (20) comprising a first switch (21) for switching the plurality of groups of LEDs (15, 16) between a plurality of different circuit configurations at a switching frequency of at least 300 kHz and according to a duty cycle; wherein the switching circuit (20) is configured to adjust the duty cycle in dependence on the output of the first control circuit (24) to adjust the electrical power used by the LED lamp (1).

Disclosed herein are system, apparatus, article of manufacture, method and/or computer program product embodiments, and/or combinations and sub-combinations thereof, for a dimmer device including a driver, and a controller communicatively coupled to the driver and to a monitor device. The monitor device can include a camera and is configured to take a plurality of images of the illumination load. The controller provides a control signal that indicates to the driver to adjust power supplied to an illumination load. The control signal is provided in response to a determination that a performance of the illumination load fails to satisfy a predetermined performance indicator. The performance of the illumination load is determined based on information related to the plurality of images of the illumination load taken by the camera of the monitor device. The controller can adjust a dimming level of the illumination load by providing the control signal to the driver.

Disclosed herein are system, apparatus, article of manufacture, method and/or computer program product embodiments, and/or combinations and sub-combinations thereof, for a dimmer device including a driver, and a controller communicatively coupled to the driver and to a monitor device. The monitor device can include a camera and is configured to take a plurality of images of the illumination load. The controller provides a control signal that indicates to the driver to adjust power supplied to an illumination load. The control signal is provided in response to a determination that a performance of the illumination load fails to satisfy a predetermined performance indicator. The performance of the illumination load is determined based on information related to the plurality of images of the illumination load taken by the camera of the monitor device. The controller can adjust a dimming level of the illumination load by providing the control signal to the driver.

A system includes an isolated converter having a power transformer with a primary winding, a secondary winding, and an auxiliary winding. The system also includes: 1) a first switch coupled to the primary winding; 2) a switch controller coupled to the first switch; and 3) a bias power regulator circuit coupled to the auxiliary winding and the switch controller. The bias power regulator circuit includes a second switch. The bias power regulator circuit is configured to provide a bias supply output voltage to the switch controller based on a first set of modes that modulate a switching frequency of the second switch and based on a second mode in which the second switch stays off.

AC-driven light-emitting diode systems and methods are provided for driving LED devices (e.g., LED lighting) using AC power. For example, an integrated circuit includes a first power line and a second power line configured for connection to AC power, and a plurality of LED stages, wherein each LED stage comprises multiple serially-connected LED devices, switches connected to inputs and outputs of the LED stages. The integrated circuit further includes switch control circuitry configured to control the switches to selectively connect one or more of the LED stages to the first and second power lines to empower the LED stages with the AC power.

AC-driven light-emitting diode systems and methods are provided for driving LED devices (e.g., LED lighting) using AC power. For example, an integrated circuit includes a first power line and a second power line configured for connection to AC power, and a plurality of LED stages, wherein each LED stage comprises multiple serially-connected LED devices, switches connected to inputs and outputs of the LED stages. The integrated circuit further includes switch control circuitry configured to control the switches to selectively connect one or more of the LED stages to the first and second power lines to empower the LED stages with the AC power.

An electrical safety monitoring device includes a first set of digital switches and a second set of digital switches for each of a plurality of line inputs, a first set of visual indicators, wherein each of the first set of visual indicators is electrically connected to one of the first set of digital switches and a second set of visual indicators, wherein each of the second set of visual indicators is electrically connected to one of the second set of digital switches. There is a first voltage-controlled oscillator operatively connected to the first set of digital switches for controlling a flash rate of the first set of visual indicators when the positive voltage is present and a second voltage-controlled oscillator operatively connected to the second set of digital switches for controlling a flash rate of the second plurality of visual indicators when a magnitude of the negative voltage is present.