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.

A lighting device, such as a light-emitting diode (LED) light source, may operate in an interim operable state to avoid and/or prevent undesirable characteristics in the light emitted by the lighting device (e.g., strobing and/or flickering of a brightness of the light and/or shifting or change of a color of the light). When operating in a normal state, the control circuit may determine if a measured value of a first operational characteristic (e.g., a forward voltage of an emitter of the lighting device) is outside of a range and operate in the interim operable state if the measured value of the first operational characteristic is outside of the range. When operating in the interim operable state, the control circuit may adjust a drive current for the emitter in response to a measured value of a second operational characteristic (e.g., a forward voltage of a detector of the lighting device).

A variable resistance power adjustment device and lamp. The variable resistance power adjustment device includes a mounting base, keycap and resistance adjustment module. The mounting base connecting to the lamp body, working with the lamp body to form a mounting cavity in an enclosure way and provided with a through-hole connecting to the mounting cavity; a keycap connecting to the mounting base flexibly and stretching into the through-hole partially; the resistance adjustment module provided in the mounting cavity, the adjustment part of the resistance adjustment module connecting to the keycap, the resistance adjustment module connects to the driving power supply of the lamp body; the keycap moves to drive the adjustment part of the resistance adjustment module to move, so that the corresponding resistance can be switched into the driving power supply from the resistance adjustment module and the resistance adjustment module adjusts the power of the whole lamp body.

A lighting control system, including a TRIAC dimmer, a wireless control apparatus, and a lighting apparatus. The lighting apparatus includes a rectifier circuit, a TRIAC dimming detection circuit, a dimming constant-current circuit, and a controller connected to the TRIAC dimming detection circuit and the dimming constant-current circuit. The controller is configured to, control the dimming constant-current circuit to perform dimming on the lighting load based on a brightness control signal, in response to receiving the brightness control signal sent by the wireless control apparatus, and control the dimming constant-current circuit to restore a default state to stop the wireless control apparatus from limiting the dimming constant-current circuit, in response to the TRIAC dimming detection circuit determining that a first preset operation is performed on the TRIAC dimmer.

A voltage-regulating phase-cut dimmable power supply includes an electromagnetic interference filter circuit, a rectifier circuit, a power conversion circuit, a transformer, a rectifier and filter circuit, a phase-cut dimming signal conversion circuit, a first optocoupler, a dimming signal conversion circuit, a voltage comparison control circuit, a second optocoupler, a pulse width modulation (PWM) control circuit, and a voltage sampling circuit. The electromagnetic interference filter circuit, the rectifier circuit, the power conversion circuit, the transformer and the rectifier and filter circuit are electrically connected in sequence. The phase-cut dimming signal conversion circuit, the first optocoupler, the dimming signal conversion circuit, the voltage comparison control circuit, the second optocoupler and the PWM control circuit are electrically connected in sequence to an output end of the electromagnetic interference filter circuit. The voltage sampling circuit is electrically connected to the voltage comparison control circuit and an output end of the rectifier and filter circuit.

A virtual and parallel power extraction method by using time division, comprising an alternating current load (1), a load end time-division power extraction control device (2), a switch end time-division power extraction control device (3), and a switch end power supply load (4). The alternating current load (1) is connected in parallel with the load end time-division power extraction control device (2); the switch end time-division power extraction control device (3) is connected in parallel with the switch end power supply load (4); a combination body formed by connecting the alternating current load (1) with the load end time-division power extraction control device (2) in parallel and the combination body formed by connecting the switch end time-division power extraction control device (3) with the switch end power supply load (4) in parallel are together connected in series in an alternating current circuit. The present invention provides an efficient power extraction method between an electronic switch and a connected load on the premise of having no a neutral line, and particularly solves the problem that the electronic switch is falsely turned off or incompletely turned off for a low-power LED lamp.

A virtual and parallel power extraction method by using time division, comprising an alternating current load (1), a load end time-division power extraction control device (2), a switch end time-division power extraction control device (3), and a switch end power supply load (4). The alternating current load (1) is connected in parallel with the load end time-division power extraction control device (2); the switch end time-division power extraction control device (3) is connected in parallel with the switch end power supply load (4); a combination body formed by connecting the alternating current load (1) with the load end time-division power extraction control device (2) in parallel and the combination body formed by connecting the switch end time-division power extraction control device (3) with the switch end power supply load (4) in parallel are together connected in series in an alternating current circuit. The present invention provides an efficient power extraction method between an electronic switch and a connected load on the premise of having no a neutral line, and particularly solves the problem that the electronic switch is falsely turned off or incompletely turned off for a low-power LED lamp.

A LED lighting circuit has a plurality of LED segments connected in series. A switching arrangement is used to selectively bypass at least one LED segment to implement a tapped linear driver approach. Degrading of a component in the LED lighting circuit is detected, so that a first TLD current modulation scheme is implemented when no such degrading is detected whereas a second current modulation scheme, different from the first current modulation scheme, is implemented to compensate for said degrading. Said degrading is leading to an increase in a turning on voltage of one LED segment, and compared to said first current modulation scheme, said second current modulation scheme has a higher voltage threshold at which said LED segment is switched. In this way, protection may be provided for circuit components and the light output may be maintained at the desired level in the event of component degrading, such as LED chip failure or contact resistance changes.

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 load control device may be configured to control an electrical load, such as a lighting load. The load control device may include a first terminal adapted to be coupled to an alternating-current (AC) power source, and a second terminal adapted to be coupled to the electrical load. The load control device may include a bidirectional semiconductor switch, a filter circuit, and a control circuit. The bidirectional semiconductor switch may be coupled in series between the first terminal and the second terminal, and be configured to provide a phase-control voltage to the electrical load. The filter circuit may be coupled between the first terminal and the second terminal. The control circuit may be configured to render the bidirectional semiconductor switch conductive and non-conductive to control an amount of power delivered to the electrical load, and be configured to adjust the impedance and/or filtering characteristics of the filter circuit.