Abstract: An optical signal output apparatus includes: a switch having a first state or a second state in accordance with user's operation; and an optical signal output section that outputs a low-level optical signal when the switch is in the first state, whereas outputting a high-level optical signal when the switch is in the second state.

Abstract: In accordance with embodiments of the present disclosure, an information handling system may include an information handling resource, a voltage regulator, a non-transitory computer-readable medium, and a controller. The voltage regulator may be coupled to the information handling resource and configured to deliver electrical energy to the information handling resource. The a non-transitory computer-readable medium may have stored thereon curve fit information, the curve fit information including coefficients of a polynomial for approximating a parameter indicative of the power efficiency of the voltage regulator as a function of a measured output current of the voltage regulator. The controller may be coupled to the voltage regulator and configured to receive information indicative of an output power of the voltage regulator and, based on the information indicative of an output power of the voltage regulator and the curve fit information, calculate an input current of the voltage regulator.

Abstract: Provided is a deep dimming control method and a driver control circuit for controlling brightness to a plurality of LEDs, that includes a controller which generates a first pulse width modulation signal, and a second pulse width modulation signal is used to switch between closed loop control and open loop control of the light intensity of the LEDs, and at least one comparator configured to receive the first PWM signal or the second PWM signal from the controller. The comparator compares the first PWM signal to a measured output current signal and regulates the output current to the LEDS in the closed loop control until a predetermined output dimming level is reached. Upon reaching the predetermined output dimming level, the controller generates the second PWM signal to another comparator, and the output current is maintained at a preset value determined by calibration during the closed loop control.

Abstract: A lighting circuit drives a light source including plural light emitting elements and includes a bypass switch circuit which includes plural bypass switches connected in parallel with the plural light emitting elements, a boost converter which boosts a power supply voltage to generate a direct current voltage stabilized at a variable target voltage, a buck converter which receives the direct current voltage to supply a driving current stabilized at a target current to the light source and which includes a hysteresis controller configured to stabilize the driving current between a peak value and a bottom value and to change a difference between the peak value and the bottom value such a switching frequency of the buck converter approaches a constant value, and a voltage adjusting circuit which is configured to dynamically change the target voltage of the boost converter according to an output voltage of the buck converter.

Abstract: An electronic dimming ballast or light emitting diode (LED) driver for driving a gas discharge lamp or LED lamp may be operable to control the lamp to avoid flickering and flashing of the lamp during low temperature or low mercury conditions. Such a ballast or driver may include a control circuit that is operable to adjust the intensity of the lamp. Adjusting the intensity of the lamp may include decreasing the intensity of the lamp. The control circuit may be operable to stop adjustment of the intensity of the lamp if a magnitude of the lamp voltage across the lamp is greater than an upper threshold, and subsequently begin to adjust the intensity of the lamp when the lamp voltage across the lamp is less than a lower threshold. Subsequently beginning to adjust the intensity of the lamp may include subsequently decreasing the intensity of the lamp.

Abstract: A switch module mountable in a switch box including a switch with a first terminal connectable to the live wire input and a second terminal, a driver circuit with input from the second terminal of the switch and with an output connected to the live wire output. The driver circuit outputs electrical power to the lighting circuit over the live wire output to LED lamp fixtures. The switch module includes a controller connected to the driver circuit. The controller is configured to control at least one of voltage, current, pulse width and pulse duty cycle of the electrical power to the lighting circuit.

Abstract: Systems, methods and apparatuses for configuring an unpowered light emitting diode (LED) driver using an RS-232 interface are provided. An LED driver includes an RS-232 serial connector and an RS-232 serial interface controller coupled to the RS-232 serial connector. The RS-232 serial interface controller is configured to provide an RS-232 port for the LED driver. The LED driver includes a voltage regulator coupled between the RS-232 serial connector and the RS-232 serial interface controller. The voltage regulator is configured (i) to receive a voltage regulator input voltage at least in part from the RS-232 serial connector when operating in an unpowered tuning mode, and (ii) to output a regulated voltage. A controller of the LED driver is powered by the regulated voltage during an unpowered tuning operation of the LED driver.

Abstract: A current source generates an output current having a nominal DC magnitude between a current output node and a reference node. The output current varies with respect to the nominal DC magnitude by a time-varying magnitude. An LED load and a sensing resistor are connected in series between the current output node and the reference node to receive at least a first portion of the output current as a load current. The load current flows through the sensing resistor and generates a sensed voltage proportional to the load current. A current regulator connected between the current output node and the reference node receives a second portion of the output current as a shunt current. The current regulator also receives the sensed voltage, and selectively increases or decreases the shunt current to reduce the effect of the time varying magnitude of the output current on the load current.

Abstract: A hybrid dimming controller for a lighting control system providing isolated class 1 and class 2 dimming outputs. The controller has two NEC class 1 outputs for providing independent low-voltage dimming-control signals for two lighting loads and two NEC class 2 outputs for providing the same two independent dimming control-signals for the lighting loads. Thus, the controller has both a class 1 and a class 2 output for delivering the same dimming-control signal for each of the two lighting loads while maintaining within the controller the isolation that is required between class 1 and class 2 circuits.

Abstract: A driver device (10) for driving a load (22), in particular for driving an LED unit comprising one or more LEDs is presented. The driver device comprises input terminals (12, 14) for connecting the driver device to an electrical power supply (16) for receiving a variable input voltage (V10) from the electrical power supply, a converter unit (25) for converting the input voltage (V10) to an output voltage (V12) including a resonant converter (40) and a switch unit (26), wherein the switch unit is adapted to provide a chopped voltage of the input voltage as a drive voltage (V16) to the resonant converter, and a control unit (34) connected to the switch unit for controlling a pulse frequency (fP) of the chopped voltage, wherein the control unit is adapted to control an input current (I10) drawn from the electrical power supply by controlling the pulse frequency of the chopped voltage on the basis of a measured value of the variable input voltage.

Abstract: Bleeder circuits (1) comprise detection circuits (11) for detecting values of amplitudes of feeding currents for feeding light emitting diode circuits (2) and comprise introduction circuits (12) for introducing bleeder currents. Values of amplitudes of bleeder currents are defined in response to detection results from the detection circuits (11). As a result, disadvantageous connections between the bleeder circuits (1) and dimmers (4) are avoided, and the bleeder circuits (1) can be located near the light emitting diode circuits (2) and they can use the same heat sink. The detection circuit (11) may comprise a first resistor circuit (31), and the introduction circuit (12) may comprise a first transistor circuit (41). The detection circuit (11) may further comprise a second resistor circuit (32) for coupling the first transistor circuit (41) to the first resistor circuit (31) and may comprise an operational amplifier (51) or a second transistor circuit (42) for controlling the first transistor circuit (41).

Abstract: A method for driving an electroluminescent display device includes generating a current detection signal corresponding to an average value of a global current per voltage control based on the global current provided to the display panel, controlling at least one of a first power supply voltage or a second power supply voltage based on the current detection signal, and changing the voltage control period based on an operation mode of the display device. The display device operates in a two-dimensional mode for displaying a planar image or a three-dimensional mode for displaying a stereoscopic image.

Abstract: A real-time lighting control system of an ecosystem and real-time lighting control method includes a computer device, multiple lighting devices and multiple wireless base stations. The lighting devices and the wireless base stations are arranged in multiple lighting regions of an indoor space. Each wireless base station emits a wireless signal continuously, and controls one or more connected lighting devices when receiving a lighting control signal. The computer device senses the wireless signals continuously, and keeps determining its position at the different time points according to the received wireless signals and the arranged positions of the wireless base stations. Next, the computer selects one of the lighting regions according to space information and the determined positions, and sends the lighting control signal to one of the wireless base stations arranged in the selected lighting region.

Abstract: An integrated circuit device is configured to drive multiple LED strings. The device includes a switch mode power supply control circuit configured to generate primary and secondary power transistor control signals and receive at least one current sense signal and an output voltage sense signal. The device also includes an output compare circuit configured to generate a plurality of pulse width modulated signals and a logic circuit configured to generate signals for selecting a reference voltage and for activating an absorber mode. The signal for activating an absorber mode is to be shared with the secondary power transistor control signal. The logic circuit is to be synchronized with the output compare module.

Abstract: A ripple suppression circuit configured to suppress a current ripple provided to a load by a DC converter, can include: a ripple voltage sampling circuit coupled to output terminals of the DC converter, where the ripple voltage sampling circuit is configured to generate a ripple reference voltage that represents a ripple voltage of an output voltage of the DC converter; and a voltage regulation circuit coupled to the load and the ripple voltage sampling circuit, where the voltage regulation circuit is controllable by the ripple reference voltage such that a voltage across the voltage regulation circuit is consistent with the ripple voltage.

Abstract: System controller for a lighting system and method thereof according to certain embodiments. For example, the system controller includes a first controller terminal configured to receive a first signal and a transistor including a first transistor terminal, a second transistor terminal, and a third transistor terminal. Additionally, the system controller includes a second controller terminal coupled to the first transistor terminal, and a third controller terminal coupled to the third transistor terminal. The system controller is configured to determine whether the first signal is associated with a leading-edge TRIAC dimmer based at least in part on the first signal, the leading-edge TRIAC dimmer being configured to receive an AC input voltage associated with at least a first half cycle from a starting time to an ending time.

Abstract: A monitor lighting control device receives a state change event message that includes a payload specifying: (i) a state change event of an occupancy, audio, or daylight sensor, or a switch to turn lighting on/off, dim up/down, set scene or the like; (ii) an identifier of a member lighting control device that detected the state change event; and (iii) a lighting control group identifier of a lighting control group that includes the member lighting control device and the monitor lighting control device. The monitor lighting control device transmits an acknowledgement of receipt of the state change event message to the member lighting control device. The monitor lighting control device generates a state change multicast message that includes the state change event of the payload. Also, the monitor lighting control device transmits the generated state change multicast message to the lighting control group.

Abstract: Lighting device including a plurality of lighting elements, at least one sensor receiving sensory stimuli from an establishment, and a control means connected with the at least one sensor and with the lighting elements. The control means can send lighting management instructions to the lighting elements depending on the captured and processed information. The lighting device also allows managing lighting in an intelligent manner. The lighting device can light with greater intensity the areas of an establishment where there are more people or the areas where greater attention is needed but are not visited often enough. The lighting device can also light in any other suitable manner depending on the information provided by the implemented sensory metrics or other independent business rules.

Abstract: Systems and methods are provided herein for current regulation. An example system controller includes: a first controller terminal configured to receive an input voltage, the first controller terminal being further configured to allow a first current flowing into the system controller based at least in part on the input voltage in response to one or more switches being closed; a second controller terminal configured to allow the first current to flow out of the system controller through the second controller terminal in response to the one or more switches being closed; a fourth controller terminal coupled to the third controller terminal through a first capacitor, the first capacitor not being any part of the system controller; and an error amplifier configured to generate a compensation signal based at least in part on the current sensing signal, the error amplifier including a second capacitor.

Abstract: An LED drive circuit (1) includes a controller (5) which controls a duty ratio of a PWM signal and driving current for driving a blue LED chip (7B) with a blue LED driver (3B) based on blue light, green light, and red light which are received by a photo sensor (4).

Abstract: The present invention refers to a lighting device (10) and a method of operating this lighting device (10). A lighting module (13) having a light element series connection (15) of several semiconductor light elements (14) is connected to the output (12) of a drive circuit (11). The control means (20) is provided which is configured to adapt a heating condition if a heating requirement is fulfilled. In the heating condition a heating means (26) is activated by the control means (20) to heat the lighting module. The heating requirement is fulfilled when the temperature (T) of the lighting module (13) drops down to a minimum temperature value (Tmin). In so doing an undesired increase of the forward voltage (Vf) of the light element series connection (15) can be avoided.

Abstract: This invention is directed to a method of growing a plant from the Cannabaceae family, the cultivar or composition produced therefrom, wherein the plant is exposed to artificial lighting of different intensities based on spacing, growth phase, and flowering yield.

Abstract: Systems and methods are provided for semi-automatic light control systems which support, amongst other features, receiving a light controlling values from one or more users and choosing an optimal light value based on the aggregated preferences of the present users. The lighting elements of the lighting system are further adjusted based on user perception profiles and other parameters. A semi-automatic determination may be made of a second light controlling value based on the first light controlling value and a user perception profile relating light parameter values with perceived light output values. Lighting element operation may be incrementally adjusted to meet the second light parameter value over a predetermined time period.

Abstract: Devices and methods of detecting a predetermined audio signal in audio signals are provided. A device includes a processor coupled to a clock signal generator, a power controller and an audio detector. The power controller controls a clock rate provided to the processor by the clock signal generator, to control the device to operate in a low power mode having a relatively low power consumption or in a normal power mode having a relatively high power consumption. The audio detector receives audio signals and detects, in the low power mode, probable presence of a predetermined audio signal in the audio signals. The power controller controls the device to switch from the low power mode to the normal power mode responsive to the detected presence of the predetermined audio signal by the audio detector.

Abstract: A system includes a lighting unit, and a primary processor. The lighting unit includes a lighting module, and a lighting driver supplying power to the lighting module. The lighting module includes: one or more light sources, one or more sensors for sensing data indicating one or more operating parameters of the lighting module, and a secondary processor receiving the sensed data. The primary processor and the secondary processor communicate with each other according to a message-based communication protocol wherein each message communicated between the primary processor and the secondary processor has an identical message format and includes a command field and a response field wherein the response field is provided for indicating a response to a command.

Abstract: Disclosed is a display controller (100) which includes: a display section (74) operable to display thereon an operation screen (W) at a predetermined reference brightness, wherein the operation screen (W) has one or more instruction images (T1, T2, T3) arranged thereon and each depressable to input a specific operator instruction; a depression detection section (12) operable to detect a depression of each of the instruction images (T1, T2, T3); and a brightness adjustment section (14) operable, when a depression of one (T1) of the instruction images is detected by the depression detection section (12), to change brightness of the operation screen (W) from the reference brightness by a change amount preliminarily associated with the one instruction image (T1).

Abstract: The present invention discloses a high efficiency charging system and a charging circuit therein. The high efficiency charging system includes a power supplier and a power receiver, which are connected via a transmission wire so that power is transmitted from the power supplier to the power receiver. The power receiver includes a voltage conversion circuit and a control circuit. The voltage conversion circuit converts an adjustable input voltage provided by the power supplier to an output voltage and generates an output current for charging a battery. The voltage conversion circuit adaptively adjusts the output current according to a voltage drop between the adjustable input voltage and the output voltage. The control circuit senses the adjustable input voltage and the output voltage and instructs the power supplier to adjust the output voltage according to the voltage drop between the adjustable input voltage and output voltage.

Abstract: A pixel architecture includes a LED, a transistor, a data receiving unit, a compensation unit, a first switching unit, a second switching unit, and a capacitor. The transistor is configured to drive the LED. The first switching unit transmits a pixel data signal to the transistor according to a first scan signal. The compensation unit transmits a reference voltage. The first switching unit transmits a supply voltage to the transistor according to a second scan signal. The second switching unit transmits the pixel data signal to the transistor according to the second scan signal or a third scan signal. The capacitor is coupled to the transistor and the data receiving unit. The pixel data signal is transmitted to the capacitor at the time that the compensation unit transmit the reference voltage to the transistor.

Abstract: An exterior aircraft light includes a base plate and a plurality of lighting units arranged on the base plate, wherein each of the plurality of lighting units includes an elongated LED light source for emitting light, the elongated LED light source having a light emitting surface with a longitudinal extension and a transverse extension, with the longitudinal extension being greater than the transverse extension and with a projection of the longitudinal extension onto the base plate defining an orientation direction of the elongated LED light source, and a collimating optical system for collimating the light emitted by the elongated LED light source towards a main output direction, wherein the plurality of lighting units has at least a first lighting unit and a second lighting unit.

Abstract: A capacitive driving system (100) comprises:—a supply device (110) having a set of transmission electrodes (111, 112) located at a top surface (117), and a power generator (13) adapted to generate alternating electrical power;—load devices (200) each having two receiver electrodes (221, 222) at a lower surface (227) and at least one load member (223) coupled to said receiver electrodes. In an energy transfer position, the lower surface of the load device is directed to the top surface of the supply device and at least one of said transmission electrodes together with a corresponding one of said receiver electrodes defines a first transfer capacitor (31). Resonant energy transfer takes place from the supply device to the load member. The load device can be rotated for enabling amendment of the capacitance value of said first transfer capacitor.

Abstract: Briefly, in accordance with one or more embodiments, a pixel circuit to drive an electro-optical element of a display backplane comprises an element driver coupled to the electro-optical element, a programming switch coupled to the element driver, and a driver switch coupled to the programming switch and the element driver. The driver switch is capable of controlling when the element driver is turned on or turned off, and is capable of pulse-width modulating the drive current provided to the electro-optical element, for example to provide a lower drive current to the electro-optical element.

Abstract: A backlight unit includes a backlight module with a printed circuit board including blocks and MJT LEDs disposed on the blocks, respectively and a backlight control module generating a signal for drive control of each of the blocks, wherein each of the blocks comprises at least one MJT LED, and the backlight control module includes a drive controller for On/Off control and dimming control of each of the blocks.

Abstract: A linear light-emitting diode (LED)-based solid-state lamp comprising electric shock and arc prevention switches, thermal protection devices, and bi-pins at the opposite ends normally operates with either an electronic ballast or AC mains. When such a lamp is installed in or uninstalled from a lamp fixture with the bi-pins in lamp sockets, the electric shock and arc prevention switches with double controls can work with the electronic ballast to prevent an electric arc from occurring not only between the lamp sockets and the bi-pins but also between electrical contacts in the electric shock and arc prevention switches. Together with the thermal protection devices, the lamp eliminates any possible fire hazard associated with the electric arc while maintaining electric shock free for installers.

Abstract: A short detection circuit is provided for detecting a short circuit condition of an LED. A voltage threshold is set which is dependent on the LED operating current, such that there are at least two different voltage thresholds at two different LED operating currents. This means false detections can be reduced and the LED current operating range can be increased over which the short detection functions.

Abstract: One aspect of the present disclosure directs to a switch circuit including an isolator circuit to allow detection of switch states of a multilevel light switch. Another aspect of the present disclosure directs to a lighting assembly containing light emitting diodes (LEDs) of different colors, where the lighting assembly produces light of different color depending on the switch state of a multilevel light switch.

Abstract: Method for controlling street lighting over a plurality of interconnected road segments, in which a road class is dynamically assigned to each road segment on the basis of, at least, stored road type data associated to each road segment and traffic parameters determined for each road segment for a current time period. At least a corresponding maximum lighting level is associated to each road class. In this method, signals comprising speed and direction of travel data of road users, and an identification of the road user are propagated through series of adjacent road segments starting from each road user's road segment, and a new lighting level equal to said maximum lighting level is set at each road segment whose distance to the road user's road segment is not greater than a first distance. A control device for implementing the above method is also disclosed.

Abstract: An automotive vehicle may include a battery charger that receives electrical energy, via an electrical connection including a ground wire, from an electrical source remote from the vehicle, and outputs the electrical energy to at least one electrical load. The vehicle may also include at least one controller that commands a change in the electrical energy output by the battery charger. The battery charger, in response to the command, may control a rate of change in the electrical energy output such that a coupling current to the ground wire resulting from the change in the electrical energy output by the battery charger has a magnitude less than a predetermined threshold.

Abstract: The present disclosure provides a smart lighting device, and a smart lighting control system and method. The smart lighting device includes a human detection module, a control module, and a microphone module. The microphone module has operation modes including a sleep mode and a monitor mode. The human detection module detects whether a human appears in a surrounding area of the smart lighting device in real-time, and sends a detection signal to the control module when a human appearance is detected. The control module receives and sends the detection signal to the microphone module to switch from a sleep mode to a monitor mode. When receiving a control signal from the control module, the microphone module switches to the monitor mode and collects audio signals in the surrounding area of the smart lighting device. The smart lighting device further includes a wireless communication module for wireless communication.

Abstract: A motor controller a pulse-width modulation (PWM) circuit, a power limit circuit, and an inverter. The PWM circuit is configured to output initial count outputs based on a current command. The power limit circuit includes a peak current detector, a divider, and a dynamic limiter. The power limit circuit is configured to provide updated count outputs based on the initial count outputs, a sensed current, and a power threshold. The inverter is controlled by the updated count outputs and configured to provide output power to a motor. The sensed current is sensed from the output power to the motor.

Abstract: The method of spatial lightbulb operation includes determining the position of the lightbulb relative to a physical space, detecting a contextual event, determining a spatial lighting pattern associated with the contextual event, and selectively controlling lightbulb light emitting elements based on the position of the lightbulb and the spatial lighting pattern.

Abstract: A light emitting diode (LED) tube lamp includes a lamp tube; a first external connection terminal coupled to the lamp tube and for receiving an external driving signal; a second external connection terminal coupled to the lamp tube and for receiving an external driving signal; a first rectifier coupled to the first external connection terminal and configured to rectify the external driving signal to produce a rectified signal; a second rectifier coupled to the second external connection terminal for rectifying the external driving signal; a filtering circuit coupled to the first rectifier and the second rectifier and configured to filter the rectified signal to produce a filtered signal; an LED lighting module coupled to the filtering circuit and configured to receive the filtered signal for emitting light; and a first bypass circuit coupled between the first rectifying circuit and the second external connection terminal.

Abstract: A bleeder circuit for use with a driver circuit having input circuitry that receives an ac input signal and outputs a rectified voltage signal at a positive terminal. The driver circuit further including converter and output circuitry operably coupled to a plurality of light-emitting diodes (LEDs). The bleeder circuit including a first resistor having a first terminal coupled to the positive terminal, and a heat sensor positioned to detect an increase in temperature of the first resistor. The heat sensor produces a heat sense signal in response to the temperature increase. A bleeder heat controller is coupled to receive the heat sense signal and produce a heat control signal in response thereto. A switching device controls a bleeder current flowing through the first resistor. The switching device receives the heat sense signal, which turns the switching device off when the temperature of the first resistor exceeding a predetermined threshold.

Abstract: The present disclosure discloses an information processing method and an electronic device. The electronic device comprises a first processing unit and a second processing unit. The second processing unit is capable of executing at least one application program. The information processing method comprises: collecting first sound information; when the first sound information comprises first information which matches with audio data preset in the first processing unit, generating a first instruction, and transmitting the first instruction to the second processing unit; when it is determined that there is a first application which meets a predetermined condition in the at least one application program, generating, by the second processing unit, a second instruction based on the first instruction and the first application; and executing the second instruction in the first application.

Abstract: An optical orthogonal frequency division multiplexing (O-OFDM) system with pulse-width modulation (PWM) dimming includes a driver responsive to one or more predetermined dimming set points configured to generate PWM signals having a predetermined duty cycle and configured to supply current to one or more light emitting diodes (LEDs). An O-OFDM generator responsive to the one or more predetermined dimming set points and digital data is configured to generate digital inverted O-OFDM signals during on-states of the PWM signals and non-inverted O-OFDM signals during off-states of the PWM signals according to the predetermined duty cycle and convert the digital inverted O-OFDM signals and the digital non-inverted O-OFDM signals to analog output O-OFDM signals.

Abstract: A device for controlling levels of light output by a solid state lighting load at low dimming levels includes a bleed circuit connected in parallel with the solid state lighting load. The bleed circuit includes a resistor and a transistor connected in series, the transistor being configured to turn on and off in accordance with a duty cycle of a digital control signal when a dimming level set by a dimmer is less than a predetermined first threshold, decreasing an effective resistance of the bleed circuit as the dimming level decreases.

Abstract: An LED driver circuit selects a regulated voltage value for use in driving one or more LEDs based on dimming duty cycle. In some embodiments, the regulated voltage value may be selected in accordance with a function that decreases monotonically with increasing dimming duty cycle. In this manner, LED current accuracy can be achieved at lower dimming duty cycles, while still achieving enhanced operational efficiency at higher dimming duty cycles.

Abstract: The invention relates to a method for controlling the operation of an LED luminaire (1) which has a plurality of LEDs (5, 6) as light sources. The method has the following steps: evaluation, by a control unit (3) for the LED luminaire (1), of an electrical signal which is produced by a switch, pushbutton or dimming switch (10) which can be operated by a user (11) and is connected to the control unit (3) and supplied with voltage via an interface (23) of the LED luminaire (1), and variation of the color spectrum of the LED luminaire (1) as a function of the evaluated signal.

Abstract: Disclosed are methods and apparatus for lighting configuration, contemplating analysis of a plurality of distance values from a plurality of distance sensors (114) to set one or more light output characteristics of a plurality of LEDs (112). The light output characteristics of the LEDs (112) are set as a function of the distance values from the distance sensors (114).

Abstract: A power converter is disclosed that includes an active valley fill (AVF) capacitor that is actively switched to provide current to a load during a portion of an alternating current (AC) input cycle. The current supplied to the load includes some current supplied by the AC input and some current supplied by the AVF capacitor. Circuitry is configured to regulate the amount of current flowing through the load, including controlling the amount of current supplied by the AVF capacitor. The duty cycle on the AVF capacitor can be adjusted to shape the AC input current waveform.

Abstract: A light source apparatus includes a light source which emits light, a response improving part which generates a response improving signal based on a first dimming control signal having a first rising period, a first operation part which generate a second dimming control signal which has the first rising period based on the first dimming control signal, a second operation part which generates a third dimming control signal by performing an arithmetic operation based on the second dimming control signal and the response improving signal, the third dimming control signal having a second rising period shorter than the first rising period and a light source driver which generates a light source driving signal based on the third dimming control signal to drive the light source based on the light source driving signal.