Abstract: A lighting apparatus includes a bridge circuit, a current source, a first LED module, a second LED module and a switch. The bridge circuit is used for rectifying an input AC power to generate a DC power. The current source receives the DC power to generate a driving current. The first LED module emits a first light of a first color temperature. The second LED module emits a second light of a second color temperature. The switch is coupled to the current source to change at least a resistance parameter corresponding to a current ratio between the first LED module and the second LED module to generate a mixed light of a mixed color temperature.

Abstract: A lighting apparatus includes an external controller, a first LED module, a second LED module, a rectifier, a power switch, a manual switch, a light housing and an allocation module. The external controller converts an external signal of an external wall switch to a light intensity signal. The external controller is coupled to the external wall switch. The wall switch is a continuous switch for a user to select a continuous value from a range. The first LED module and the second LED module emit lights of different color temperatures. The rectifier for converts an AC power to a DC power. The power switch is coupled to the rectifier for generating a driving current corresponding to the light intensity signal. The manual switch selects a color temperature setting.

Abstract: A lamp driver delivers an output voltage and output current to a lamp load. A current regulating circuit at a secondary side provides a feedback signal for use by the driver when in a current regulation mode. An overvoltage protection circuit detects an overvoltage condition of an output voltage and modulates the feedback signal during detection of the overvoltage condition. The overvoltage condition can then be recognized more easily based on the resulting modulation of the output voltage.

Abstract: A load control device (e.g., an LED driver) for controlling the intensity of a lighting load (e.g., an LED light source) may provide a wide output range and flicker-free adjustment of the intensity of the lighting load. The load control device may comprise a load regulation circuit, a control circuit, and a filter circuit (e.g., a boxcar filter circuit) that operates in a different manner in dependence upon a target current. When the intensity of the lighting load is near a low-end intensity, the control circuit may adjust an operating frequency of the load regulation circuit in response to the target current, and may control the filter circuit to filter a current feedback signal during a filter window that repeats on periodic basis. When the intensity of the lighting load is near a high-end intensity, the control circuit may control the filter circuit to constantly filter the current feedback signal.

Abstract: A tubular LED lamp to be used with an external electronic power controlling device which is adapted to provide an input voltage to the lamp, comprising: a LED unit; a driving circuit for the LED unit; and a safety detection circuit adapted to detect whether the tubular LED lamp is correctly connected to an external lamp fixture; characterized in that further comprising: a holding current providing circuit adapted to provide a holding current through the electronic controlling device so as to maintain the electronic controlling device to be conductive; and a controlling circuit adapted to synchronize the safety detection circuit with the holding current providing circuit such that the safety detection circuit is adapted to carry out the detection when the hold current providing circuit is adapted to provide the holding current and the electronic controlling device is conductive; wherein the controlling circuit is adapted to deactivate the holding current providing circuit and the safety detection circuit after

Abstract: System and method for controlling one or more light emitting diodes. For example, the system for controlling one or more light emitting diodes includes a current generator configured to generate a first current flowing through one or more light emitting diodes. The one or more light emitting diodes are configured to receive a rectified voltage generated by a rectifying bridge coupled to a TRIAC dimmer. Additionally, the system includes a bleeder configured to receive the rectified voltage, and a controller configured to receive a sensing voltage from the current generator and output a control signal to the bleeder. The sensing voltage indicates a magnitude of the first current.

Abstract: A LED circuit comprises a current drive circuit for driving a current through the parallel combination of a LED arrangement and an output capacitor. An override arrangement overrides the current level setting to a default current level during start-up, and the override arrangement is disabled when a current flow is sensed by a sensor. The current setting of the driver is ignored until a threshold current is sensed through the LED arrangement. The delay associated with initial start-up charging of the output capacitor is thereby avoided.

Abstract: Apparatus and methods for deployment of fixtures. The apparatus may include a system for controlling deployed fixtures. The system may receive user commands different devices in different formats. The fixtures may be independently addressable. The fixtures may be magnetically supported by a fixture support. A brace may join two or more fixture supports without reducing space available to support fixtures. The brace may join a fixture support to a fixture support accessory. An accessory may include a variable-angle junction. The fixture may include articulating joints for controlling the direction of a beam. The fixture may include a lens having an electrically controllable beam spread angle. The fixture may be stowable in the fixture support. The fixture may be slidable along a cord to adjust a height of the fixture. The fixture may include an extendable ring. The system may coordinate motions of the fixtures to follow a target. The fixture may include an elongated board.

Abstract: A LED lamp string of easy welding, assembly and injection includes at least one rectifier, and multiple LED modules connected in series between positive and negative output ends of the at least one rectifier. Each LED module includes a first PCB, and the first PCB is provided with multiple first welding positions. The first welding positions are welded with a lamp bead and wires thereon. The lamp bead is connected to first ends of the wires, and a second end of the one wire of each LED module is directly connected to the at least one rectifier or is connected to the at least one rectifier after passing through at least one other LED module. It can realize the large-scale production of the welding equipment instead of manual welding, greatly improve the efficiency of the production, avoid false welding and improve the yield rate.

Abstract: The present disclosure relates to a driving circuit individually performing drive control of light-emitting elements having cathodes with the same potential. The driving circuit includes driving circuit units provided in one-to-one correspondence with the light-emitting elements. Each driving circuit unit includes a switching element, a first energy-storage element, a current-control element, and a current-interrupting element. The current-control element connects in parallel to the semiconductor light-emitting element. In the first energy-storage element, a first electrode connects to a first node, and a second electrode connects to a first constant-potential line. In the switching element, a first current terminal connects to a second electrode, and a second current terminal connects to a second node. The second nodes connect to the second constant-potential line without short-circuiting each other by the current-interrupting element.

Abstract: An illumination device and method are provided herein for calibrating individual LEDs in the illumination device to obtain a desired luminous flux and a desired chromaticity of the device over changes in drive current, temperature, and over time as the LEDs age. The calibration method may include subjecting the illumination device to a first ambient temperature, successively applying at least three different drive currents to a first LED to produce illumination at three or more different levels of brightness, obtaining a plurality of optical measurements from the illumination produced by the first LED at each of the at least three different drive currents, obtaining a plurality of electrical measurements from the photodetector and storing results of the obtaining steps within the illumination device to calibrate the first LED at the first ambient temperature.

Abstract: optoelectronic circuit intended to receive a variable voltage containing an alternation of rising and falling phases. The optoelectronic circuit includes light-emitting diodes and a switching device capable of allowing or of interrupting the flowing of a current through each light-emitting diode. Each light-emitting diode is covered with a photoluminescent layer. The photoluminescent layer covering at least one of the light-emitting diodes includes at least one first luminophore having a first decay constant and at least one second luminophore having a second decay constant different from the first decay constant.

Abstract: A high-compatibility lighting dimmer is provided, which includes an impedance inspection avoidance module, a dimming operation module, an alternating-voltage input module and a dimming control module. The impedance inspection avoidance circuit is connected to a load via an output end. The dimming operation module is connected to the impedance inspection avoidance module and includes a control unit. The alternating-voltage input module is connected to the dimming operation module and converts an input alternating voltage into a pulsating direct voltage to power the load and the dimming operation module. The dimming control module is connected to the control unit and transmits a dimming signal to the control unit. When the load is driven, the control unit starts timing and switches the impedance inspection avoidance module after a predetermined time period, whereby the dimming operation module directly powers the load and performs dimming for the load according to the dimming signal.

Abstract: A lighting system, such as for an indoor growing facility, comprises a plurality of lighting units, each lighting unit comprising at least one LED, wherein each lighting unit is powered by a power supply and wherein the plurality of lighting units are arrayed linearly.

Abstract: A light-emitting system is provided and includes a controller and a light-emitting circuit. The controller has a data output terminal and provides a light-emitting data signal by the data output terminal. The light-emitting circuit is connected to the data output terminal to receive the light-emitting data signal. The light-emitting circuit includes M light-emitting units serially connected in sequence, wherein M?2. Each light-emitting units has a main input terminal and an output terminal, and each of the second to M-th light-emitting units further has an auxiliary input terminal. The data output terminal is connected to the main input terminal of the first light-emitting unit among the M light-emitting units through a first wire. There is a first shunt node on the first wire, and the first shunt node is connected to the auxiliary input terminal of the second light-emitting unit among the M light-emitting units.

Abstract: A lighting apparatus includes a rectifier, a constant current circuit, a first LED series, a second LED series, a third LED series and a controller. The rectifier converts an alternating current power to a direct current power. The constant current circuit generates a first driving current, a second driving current and a third driving current derived from the direct current power. The controller has a first mode to only turn on the first LED series and to turn off the second LED series and the third LED series. The controller has a second mode to adjust the first PWM signal, the second PWM signal and the third PWM signal to generate a corresponding color temperature.

Abstract: In a power converter including: a first DC-DC converter, an inverter, and a control circuit, a second DC-DC converter that controls an input and an output of a power storage unit is connectable to a DC bus. The control circuit deactivates a reverse power flow suppression function for suppressing a reverse power flow from the inverter to a power system when the second DC-DC converter is not connected to the DC bus and activates the reverse power flow suppression function when the second DC-DC converter is connected to the DC bus.

Abstract: A power converter can include an input circuit having a primary winding and a primary power switch coupled in series between an input terminal and the ground; a first output circuit having a first secondary winding which is coupled with the primary winding; a second output circuit having a second secondary winding coupled with the primary winding and at least one secondary power switch; a first control circuit that controls the primary power switch to be turned on and off to adjust an output signal of the first output circuit; and a second control circuit which controls the secondary power switch to be turned on and off to adjust an output signal of the second output circuit. The secondary power switch can be turned on before the primary power switch is turned off in a first state in one switching cycle, in order to reduce the switching interference.

Abstract: A system and method for controlling the current to an LED array is disclosed. The system comprises a microcontroller and an external transistor. The microcontroller has access to the relevant voltages in the circuit, including the voltage across the sense resistor, the voltage at the drain of the external transistor and the high voltage input. By monitoring these voltages, the microcontroller may be able to control the gate input to the external transistor so as to control the current in the LED array. Further, the microcontroller includes provisions to allow for dimming of the LED array, if desired. This configuration allows for post-manufacturing changes to the operation of the system without any hardware modifications.

Abstract: The present invention relates to a method and system for automatic address allocation in serially connected controlled devices (e.g. luminaires) to achieve a changed control configuration. A signal adapter is modified to send an address sorting command, so that each of the controlled devices will automatically allocate an address to itself in sequence one by one upon receiving the address sorting command from the signal adapter.

Abstract: A method is provided for operating a resonant power conversion apparatus The method may include charging a capacitor connected to a power source in parallel, and determining a discharge time point and a discharge period of a discharge circuit, where the discharge circuit includes a resistor and a switch connected in series and is connected to the capacitor in parallel. The method may also include outputting, by a switch control circuit, a switch control signal by determining the switch control signal based on the discharge time point and the discharge period, and discharging the charged capacitor through the resistor based on the switch control signal applied to the switch. A resonant power conversion apparatus for performing the above-described method is provided.

Abstract: A method of controlling light adjustment include activating a power supply; activating a digital control circuit to carry out an adjustment output voltage control mode, sense a signal from a light adjustment control switching circuit, and determine a light adjustment control mode; in response to an LED power source operating in the adjustment output voltage control mode, adjusting luminance from 100% to N % and continuously adjusting luminance from N % to ?0.01% wherein a 100% PWM signal output from a PWM driving signal circuit is unchanged, and a light adjustment signal collection circuit transmits a collected light adjustment signal having luminance between N % and ?0.01% to the digital control circuit; in response to the LED power source operating in a PWM adjustment control mode, adjusting luminance from 100% to N % and continuously adjusting luminance from N % to ?0.01%; and obtaining a light adjustment curve.

Abstract: A power tap includes a housing having a top surface, a bottom surface, and at least one side surface. A first male connector is integrated with a substantially planar portion of the bottom surface and arranged for substantially permanent electromechanical coupling to a first female connector that is integrated with a streetlight luminaire. A second female connector is integrated with a substantially planar portion of the top surface and arranged to receive a second male connector that is integrated with an electronic control device. Each male connector and each female connector is compliant with a roadway area lighting standard promoted by a standards body. The power tap also includes power conversion circuitry arranged to receive a higher voltage input signal and to produce at least one lower voltage output signal.

Abstract: A drive circuit 3 includes a power source 11; current control units 12-1 to 12-n configured to control the amount of currents supplied to a light emitting element in accordance with a pulse modulation signal; and a calculation unit 13 configured to change a duty ratio of a pulse modulation signal. The current control units 12-1 to 12-n include a first switching element 21 configured to be switched on/off in accordance with a pulse modulation signal; and a second switching element 22 configured to be switched on/off in accordance with an inversion signal of the pulse modulation signal input to the first switching element 21; and an inductor 23. The first switching element 21 and the inductor 23 are serially connected between the power source and the light emitting element. The second switching element 22 is connected between ground 25 and a contact point 24 of the first switching element 21 and the inductor 23. The two or more current control units 12-1 to 12-n are connected in parallel.

Abstract: An apparatus, an integrated circuit die, and a method of fabricating a group III-nitride (III-N) integrated RF front-end circuit are disclosed. The apparatus includes a III-N integrated radio frequency (RF) front-end circuit that includes a semiconductor substrate, a plurality of functional blocks, each of the plurality of functional blocks comprising a III-N structure on the semiconductor substrate. The III-N integrated RF front-end circuit is to be coupled to an antenna.

Abstract: A lighting unit which includes a driver, a light source and a buffer capacitor of an auxiliary circuit (such as an independent active electronic circuit). The charging current allowed to flow to the buffer capacitor is controlled based on sensed currents flowing to the light source thereby to control the charging current of the buffer capacitor. In this way, large inrush currents caused by the use of a large buffer capacitor at the output of the driver can be avoided and the triggering of a fault detection mode within the driver can be prevented. Furthermore this circuit ensures that the driver is operated within the specification limits during start-up.

Abstract: An apparatus method for driving light emitting diodes (LEDs), comprising: receiving an alternating current input; producing a DC current having a voltage with an AC-DC boost power-factor correction stage, having a variable-frequency operation, and a set of switches controlled in dependence on the voltage to limit a peak LED current; and producing an LED drive current with a DC-DC power conversion stage having a set of switches to selectively pulse-width modulate the LEDs to control a brightness, wherein the set of switches in the AC-DC boost power-factor correction stage and the set of switches in the DC-DC power conversion stage are each controlled to switch at zero current.

Abstract: Methods and systems for improved control of dimmable, white color tunable, multiple channel LED based illumination systems are described herein. The methods and systems described herein improve the utilization of LEDs comprising a multiple channel white light LED based illumination system, along with improved control of brightness and color of emitted light. In one aspect, a multiple channel electrical power driver includes an independent current controlled Direct Current/Direct Current (DC/DC) electrical power converter electrically coupled to each LED string having a different color output. The use of independent DC/DC power converters enables current to be supplied to each LED channel simultaneously up to the rated maximum continuous operating current level in each channel. Thus, the sum of the current provided to each LED channel exceeds the rated maximum continuous operating current of each of the LED channels.

Abstract: A retrofit Light Emitting Diode, LED, tube for replacing a fluorescent tube, wherein said retrofit LED tube is arranged to be connected to a ballast, said retrofit LED tube comprising a ballast determining unit arranged for identifying a type of ballast connected to said retrofit LED tube by controlling an output voltage of said power rectifier to a first voltage and measuring a first current provided by said power rectifier, controlling said output voltage of said power rectifier to a second voltage and measuring a second current provided by said power rectifier, wherein said second voltage differs from said first voltage and determining said type of ballast based on said first and second output voltages and said measured first and second currents, wherein said ballast determining unit is further arranged to configure said configurable matching circuit based on said determined type of ballast.

Abstract: A method of detecting crosstalk for a digital isolator having first and second channels including two die with channels including a transmit side, receive side, with ?1 die including a capacitive barrier for each channel. A first clock signal at a first frequency in a first pulse pattern and a second clock signal at a second frequency in a second pulse pattern are configured, wherein the pulse patterns have a phase difference. The transmit side of the channels each encode their received clock pulse pattern, then modulate with a carrier frequency to provide a fc1 and a fc2 signal, respectively. The receive side of the channels demodulate received signals during a rising or falling edge of their clock signal to generate a delayed received version of the first and second clock pulse pattern. Missing pulses are identified by comparing the delayed received clock pulse patterns to their clock pulse patterns.

Abstract: The present invention discloses an LED lighting assembly configured to retrofit a fluorescent tube, comprising at least one LED, and a driving circuit configured to drive the at least one LED. The driving circuit comprises a switch control module and a rectifying circuit. The driving circuit is connected to the at least one LED and configured to receive and process an AC voltage signal from one side or both sides of the LED lighting assembly, and control the driving of the at least one LED based on the processed voltage signal. The rectifying circuit is connected to the at least one LED and configured to convert an AC power inputted to the rectifying circuit into a DC power supplied to the at least one LED. The present invention also discloses an LED driving circuit configured to retrofit a fluorescent tube.

Abstract: A switched-mode power supply includes: a switching converter converts an input voltage into an output voltage in accordance with a switching signal, wherein the switching converter includes a transformer providing galvanic isolation between a primary side and a secondary side of the switching converter; and a wake-up circuit connected to the secondary side of the switching converter, the wake-up circuit coupled to the secondary side of the switching converter and operable to generate a feedback signal that indicates whether the output voltage is greater than or equal to a threshold value. A primary side regulator generates a control signal depending on a reference value and a measured value (VAUX) representing the output voltage. Primary side logic generates the switching signal depending on the control signal. A tracking unit receives the feedback signal via a galvanically isolating component and adjusts the reference voltage based on the feedback signal.

Abstract: The present application discloses systems and methods for providing low voltage power for low voltage lighting sources, e.g., so-called landscape lighting. A low voltage lighting power supply includes an enclosure and a power circuit enclosed in the enclosure. In some embodiments the power circuit has a primary side and a secondary side. The primary side accepts power from a main power source and the secondary side has a plurality of separate output power circuits, each output power circuit generating a separate low voltage lighting power signal capable of lighting a plurality of low voltage light sources and each being rated for a particular output.

Abstract: A power and control assembly is disclosed. An LED driver is sized and adapted to fit within a single compartment of an electrical gang box. The driver has a groove or channel, and an electrical element, such as a switch, is sized to fit within the groove.

Abstract: An illumination system is disclosed that is arranged to compensate for variations in brightness between different LEDs in the system. The system may include an array of LEDs coupled to a light guide that is provided with a plurality of light extraction patterns. Each light extraction pattern may include a plurality of light extraction features. The light extraction patterns may differ from one another in the density of the features. Light extraction patterns having a greater density may be combined with LEDs in the array that are less bright, whereas light extraction patterns having a lower feature density may be combined with LEDs in the array that are brighter.

Abstract: The present application relates to a lighting control apparatus (2) configured to control light emitted from at least one light emitting device (4) using one or more control signals (6). The apparatus (2) uses data (10) associated with a physiological or cognitive state of a user to determine an appropriate control signal (6) to send to the light emitting device (4) when light control input data (8) is provided via a light control input device (30). The apparatus (2) is used in conjunction with a network of lights providing different combinations of intensity and hue. Also presented is a method (14) for controlling light emitted from at least one light emitted device (4) using one or more control signals (6).

Abstract: A lighting device is provided with input terminals that receive corresponding terminals from any one of an analog or digital dimming device or a driver configuration device. Depending on the type of connected device, different circuits are enabled by a controller to receive dimming control signals from an analog or digital dimming device, or to receive device configuration data from a multiple driver configuration device. A wireless interface circuit receives and stores configuration data via an antenna. The controller automatically detects whether one of the analog or digital dimming device or the driver configuration device is coupled to the input terminals, enables a corresponding one of the analog and digital interface circuit or the driver configuration interface circuit, and generates output current reference signals for regulating the output current from the driving circuit, said reference signals corresponding to the received dimming control signals via the analog and digital interface circuit.

Abstract: An LED device is disclosed. The LED device comprises a first LED light string, a second LED light string, a rectifying module, and a control unit. The control unit generates a driving current flowing through the first LED light string and the second LED light string. The control unit cuts off the driving current when the input signal is between a threshold voltage and a sum voltage.

Abstract: A light bar includes a plurality of first color light emitting LEDs including a first subset of first color light emitting LEDs and a second subset of first color light emitting LEDs, a plurality of second color light emitting LEDs, where the second color is different from the first color, and a plurality of third color light emitting LEDs, where the third color is different from the first and the second colors. The second subset of first color light emitting LEDs are electrically connected in series with a larger electrical load than the first subset of first color light emitting LEDs. This light bar electrical configuration allows compensation and correction for locations on the light guide plate used in back light units where imperfect mixing of the 3 primary colors provided by the individual LED emitters on the light bar occurs.

Abstract: The present disclosure provides a DC concentrated illumination system, including a DC distribution box configured for converting a command specification that controls the state of lamps into a voltage signal with a varying amplitude, and outputting the voltage signal via a power line; and a plurality of lamp units, each includes a lamp, a power conversion unit and a simulated load unit, wherein the power conversion unit is coupled to the lamp and the simulated load unit, and is coupled to the DC distribution box via the power line. The power conversion unit receives the voltage signal and collects the state information of the lamps when the voltage signal matches a preset convention rule successfully; and the power conversion unit controls the action of the simulated load unit to get a current signal, the DC distribution box parses the current signal to obtain the state information of the lamps.

Abstract: The present disclosure provides a switch control device and method for electronic device, and an electronic device. The switch control device of the electronic device comprises: a high level output unit, connected with the high level input terminal and configured to output a high level with a predetermined amplitude to the high level input terminal, the predetermined amplitude higher than a predetermined voltage; a logic level output unit configured to output a logic level; and a switch unit, with a control terminal inputted with the logic level, a first terminal inputted with the ground terminal, and a second terminal inputted with a low level, and configured to connect the first terminal and the second terminal when the logic level is in a first state, in order to turn on the electronic device, and disconnect the first terminal from the second terminal when the logic level is in a second state, in order to turn off the electronic is device.

Abstract: A light emitting diode lamp with a burnable function includes a light emitting diode and a light emitting diode driving apparatus. The light emitting diode driving apparatus receives a burn start signal and a burn address data sent through a first contact. The light emitting diode driving apparatus burns the burn address data as a local address data into the light emitting diode driving apparatus after the light emitting diode driving apparatus receives the burn start signal. A first signal is a plurality of pulse signals, and comprises a lighting data and an address data. The light emitting diode driving apparatus compares the address data with the local address data, and drives the light emitting diode to light, glimmer or flash colorfully or sparklingly, or light fade-in and fade-out, based on the lighting data if the address data is the same with the local address data.

Abstract: A lighting apparatus includes first light emitting elements and second light emitting elements, and a control circuit. The first light emitting elements the second light emitting elements are dispersedly disposed in a predetermined region. The first light emitting elements are more densely disposed in a periphery portion than in a center portion of the predetermined region. The second light emitting elements are more densely disposed in the center portion than in the periphery portion of the predetermined region.

Abstract: A system for driving one or more electrical currents includes a current driver operable to cause current to flow to the one or more driven electrical elements, a sensor module for sensing a current at the input of the current driver, a compensation module for compensating an input control signal based on the sensed current at the input of the current driver and an optocoupling module having a grounded side connected to an earth ground and a floating side connected to a floating ground. The grounded side receives the compensated control signal and the floating side outputs a floating control signal corresponding to the compensated control signal. An amplification module connected to the floating ground is operable for amplifying the floating control signal outputted from the optocoupling module. The amplified floating control signal further controls the current driver to cause the flow of current to the driven electrical elements.

Abstract: An AC-driven LED lighting apparatus includes: a triac dimmer to generate a modulated AC voltage by modulating a phase of AC power according to a selected level of dimming; a rectifying circuit to generate drive voltage by full-wave-rectifying the AC voltage having the phase modulated by the triac dimmer; a dimming level detector to detect a dimming level according to the drive voltage; a phase cut reference setting unit for setting a phase cut reference value; and a LED driving module for constant-current-controlling a plurality of LED groups by comparing the detected dimming level with the phase cut reference value, wherein the light emitting element driving module comprises a LED current blocking unit for blocking a drive current supplied to the plurality of LED groups when the dimming level is lower than the phase cut reference value.

Abstract: A free voltage LED driving device with a high luminous uniformity ratio includes a rectifying device for rectifying an AC voltage applied thereto from outside and outputting a DC voltage; a plurality of LED array parts to have the DC voltage applied thereto to emit light emitting diodes; a plurality of current drain switching devices to have current that is output from each of the plurality of LED array parts applied thereto, outputting a plurality of currents having a drain current value; a series type switching device controlling a transfer of current according to an opening and closing of a plurality of built-in transistors; a current control variable resistance part for varying and adjusting a resistance value so that power is output in a constant manner when the applied AC voltage changes; and a voltage detecting circuit part to detect the DC voltage.

Abstract: A strip of linear lighting with distributed power conversion is disclosed. The linear lighting includes a flexible PCB. The flexible PCB is divided into repeating blocks, which are arranged electrically in parallel with one another between power and ground. Each repeating block includes power conversion and conditioning circuits. A plurality of LED light engines are connected to the outputs of the power conversion and conditioning circuits, electrically in series with one another. The power conversion and conditioning circuits typically include at least a full-bridge rectifier. A pair of conductors run the length of the PCB adjacent to it and are connected to each of the repeating blocks. A flexible, transparent covering surrounds the PCB and pair of conductors.

Abstract: An LED driving circuit comprises an LED unit having a plurality of LEDs connected in series, coupled with a voltage charging and discharging unit and powered by a rectified AC voltage of an AC input voltage. A controllable current limiting unit or a current limiting unit in association with a switch connects the LED unit to ground. The voltage charging and discharging unit has first and second diodes connected to the LED unit, and a storage capacitor to form a charging path through the first diode and a discharging path through the second diode in order to provide a steady state capacitor voltage for reducing the number of LEDs connected in series in the LED unit.

Abstract: A conventional single-ended, primary-inductance converter (SEPIC) has its switching frequency determined by a controller, which determines the duty cycle at which the switch operates by measuring differences between the SEPIC output voltage and a reference voltage. A controller is coupled to a switch of the SEPIC and provides a pulse train which determines the duty cycle and frequency at which the switch operates. The duty cycle is selectable between first and second percentages, the frequency is selectable between first and second frequencies, and the duty cycle and frequency are selected by the controller responsive to a voltage at an input voltage terminal of the SEPIC. Output voltage overshoot and undershoot are reduced.

Abstract: The present invention discloses a switching regulator capable of reducing current ripple and a control circuit thereof. The switching regulator includes a buck power stage circuit and a control circuit. The control circuit includes an operation signal generation circuit and a current source circuit for reducing current ripple. The current source circuit is coupled to the operation signal generation circuit and the buck power stage circuit, for operating a ripple reduction switch therein according to an operation signal, to convert the output voltage to a load voltage between a load node and a reference node, and to reduce a current ripple of the output current, so as to generate a load current which is supplied to a load circuit, wherein the load circuit is coupled between the load node and the reference node, and the current source circuit is coupled between the output node and the load node.