Abstract: An illumination control system includes a rectifying device, a damping device for inhibiting flickering, and a load circuit, wherein the illumination control system further comprises a recognizing control circuit connected between the rectifying device and the damping device, and wherein the recognizing control circuit includes a recognizing signal output module and a switch module, the recognizing signal output module generates a first control signal indicating that a dimmer is not connected upstream the rectifying device or the dimmer is connected upstream the rectifying device and reaches a predetermined dimming level and a second control signal indicating that the dimmer is connected upstream the rectifying device and does not reach the predetermined dimming level and at least one damping resistor of the damping device is short connected or is connected by means of the switch module according to the first control signal or the second control signal.

Abstract: A dimmer circuit may include: a rectification module, a control module and an output module, wherein the control module receives an input signal rectified through the rectification module and controls the output module to supply a load with an output signal in accordance with the input signal, and a compensation module which collects sampled signals characterizing dimming state of the dimmer circuit between the control module and the output module, and supplies the control module with a compensation signal in accordance with the sampled signals, the control module changing the value of the output signal according to the input signal and the compensation signal.

Abstract: A display apparatus includes a display panel, a display driving module, a backlight module, and a backlight driving module. The backlight module includes a plurality of illumination units. The backlight driving module includes a driving circuit, a plurality of switch units, and a plurality of detecting units. Each of the switch units connects to exactly one of the illumination units, and each of the detecting units connects to exactly one of the illumination units and two of the illumination units simultaneously. When the illumination unit connected to the switch unit corresponding to the detecting unit is damaged, the detecting unit controls the connected switch unit to be turned off for cutting off an electrical connection between the driving circuit and the illumination unit corresponding to the connected switch unit, and the remaining illumination units continue to emit light.

Abstract: An optical sensor circuit comprises an optical sensor (DET) designed to provide a sensor signal indicative of a color of light incident on the optical sensor (DET), a clock designed to provide a clocked control signal comprising consecutive high and low states, and a controller unit (CU) connected to the optical sensor (DET) and comprising the clock. The controller unit (CU) is designed to process the sensor signal as a color signal (CTS) in a first mode if the clocked control signal is in a high state, wherein the color signal (CTS) is indicative of a color of light emitted by a light emitting device (LED) to be connected at a control terminal (OUT). The controller unit (CU is further designed to process the sensor signal as an ambient color light signal (aCTS) in a second mode if the clocked control signal is in a low state, wherein the ambient color light signal (aCTS) is indicative of a color of ambient light.

Abstract: Disclosed is a display device that may include a first data driver and a second data driver, each checking availability of a data transmission with a timing controller upon receiving a power voltage; a synchronization unit that outputs a power management signal when both the first and second data drivers become available for their data transmission with the timing controller; and a power module that supplies a high-potential voltage to the first and second data drivers in response to the power management signal output from the synchronization unit.

Abstract: Disclosed is a power supply device including a wired controller receiving AC power to generate a driving voltage, and outputting a lighting driving signal, a wireless controller wirelessly receiving a lighting control signal and outputting the lighting control signal to the wired controller, and a standby power supply unit receiving a reference standby voltage based on the driving voltage, storing the reference standby voltage, and supplying the reference standby voltage to the wireless controller as standby power. In the lighting control device based on wired/wireless communication, the power is always obtained from the super capacitor to turn on the wireless controller, so that the turn-on state of the power generator of the wired controller is not always required. The power consumption is reduced by reducing the standby power.

Abstract: A multi-stage LED dimming module includes a voltage source and an LED control module having a dual-link pull switch, a substrate, a control circuit and a multiple of LED light sources, and the control circuit further includes a rectifier/filter circuit unit, a resistor array unit and a control circuit unit, and the voltage source is electrically connected to the LED control module for controlling the brightness of the LED control module, so as to achieve the effects of providing a convenient application and a stable structure.

Abstract: A light-emitting element lighting device includes: a step-down chopper circuit which outputs a current that flows to a light-emitting element; a current command circuit which selects between a rated mode for passing a rated current for turning ON the light-emitting element and a detection mode for passing an abnormality detection current, which is smaller than the rated current, for detecting an abnormality in the light-emitting element; a voltage detection circuit which detects a voltage across both ends of the light-emitting element; and a control circuit which causes the step-down chopper circuit to stop outputting the current to the light-emitting element, when the voltage across both ends detected by the voltage detection circuit in the detection mode is lower than or equal to an abnormality detection threshold voltage which is set lower than the rated voltage at the time when the light-emitting element is turned ON.

Abstract: Disclosed is an improved light-emitting device for an AC power operation. A conventional light emitting device employs an AC light-emitting diode having arrays of light emitting cells connected in reverse parallel. The arrays in the prior art alternately repeat on/off in response to a phase change of an AC power source, resulting in short light emission time during a ½ cycle and the occurrence of a flicker effect. An AC light-emitting device according to the present invention employs a variety of means by which light emission time is prolonged daring a ½ cycle in response to a phase change of an AC power source and a flicker effect can be reduced. For example, the means may be switching blocks respectively connected to nodes between the light emitting cells, switching blocks connected to a plurality of arrays, or a delay phosphor.

Abstract: Various embodiments provide a method for determining a wave form of a lamp current for operating a discharge lamp of a projection arrangement having a color wheel and a ballast, such that a polarity of the electrodes is commutated in accordance with a commutation scheme of the wave form. The method involves providing a wave form having a commutation scheme and checking whether operation of the discharge lamp satisfies one criterion relating to a lifetime of the discharge lamp or a flicker amplitude of the projection arrangement. If the criterion checked is satisfied, checking whether operation of the discharge lamp satisfies the other of the two criteria is carried out. If at least these two criteria are satisfied, the wave form is stored in a memory of the projection arrangement and provided as the predefinable wave form at the ballast for the discharge lamp.

Abstract: Disclosed are a lighting control method and a lighting control system. The lighting control apparatus makes communication with lighting devices, registers at least one of the lighting devices according to received signal strengths of the lighting devices, and controls the registered lighting device. The lighting control apparatus easily registers and controls the lighting devices.

Abstract: An image projection apparatus includes a light source in which a light emitting material emits light through an electric discharge between electrodes; an image forming unit that modulates an intensity of the light emitted from the light source to form an image; a cooling fan that cools the light source; an input unit that receives an input of an instruction signal for turning off a power source of the image projection apparatus; a voltage detector that detects a voltage value of the light source in lighting; a voltage value determining unit that determines whether the voltage value detected by the voltage detector is less than a preset threshold value when the input unit receives the instruction signal; and a cooling fan controller that performs an after-cooling operation of driving the cooling fan to cool the light source when the voltage value is less than the threshold value.

Abstract: A number of luminaires can be communicably coupled and networked. Some or all of the luminaires may be equipped with a number of sensors including motion sensors. Upon detecting motion of an object in the vicinity of a luminaire, the luminaire can increase the luminous output of the lighting subsystem in the luminaire and communicate a targeted or broadcast output signal to some or all of the remaining luminaires in the network. The output signal may variously contain data indicative of one or more parameters related to motion of the object (direction of travel, velocity, etc.) or one or more parameters related to the increased luminous output of the luminaire. Responsive to the receipt of an output signal generated by another luminaire, the luminaire may autonomously adjust the luminous output of the lighting subsystems responsive to an event detected by the other luminaire.

Abstract: An apparatus, method and system are disclosed for providing AC line power to lighting devices such as light emitting diodes (“LEDs”). A representative apparatus comprises: a plurality of LEDs coupled in series to form a plurality of segments of LEDs; first and second current regulators; a current sensor; and a controller to monitor a current level through a series LED current path, and to provide for first or second segments of LEDs to be in or out of the series LED current path at different current levels. A voltage regulator is also utilized to provide a voltage during a zero-crossing interval of the AC voltage. In a representative embodiment, first and second segments of LEDs are both in the series LED current path regulated at a lower current level compared to when only the first segment of LEDs is in the series LED current path.

Abstract: System and method are provided for generating a plurality of channel currents. The system includes a channel reference generator configured to receive a first reference current and generate at least a first channel driving current and a second channel driving current, a first channel current divider configured to receive the first channel driving current and generate a first input current, a second input current, and a third input current, a second channel current divider configured to receive the second channel driving current and generate a fourth input current, a fifth input current, and a sixth input current, a first channel driver configured to receive the first input current, the second input current, and the third input current and generate a first channel current, and a second channel driver configured to receive the fourth input current, the fifth input current, and the sixth input current and generate a second channel current.

Abstract: Lighting systems having unique configurations are provided. For instance, the lighting system may include a light source, a thermal management system and driver electronics, each contained within a housing structure. The light source is configured to provide illumination visible through an opening in the housing structure. The thermal management system includes a plurality of synthetic jets. The synthetic jets are arranged within the lighting system such that they are secured at contact points.

Abstract: An LED power supply device disclosed in the present specification includes a DC dimmer circuit that performs dimming control of an LED such that the higher a reference voltage variably controlled according to a dimmer signal is, the smaller a current flowing in the LED is. This configuration makes it possible to achieve fine dimming control.

Abstract: The present solution provides continuous adjustment of a reference signal to a control chip to facilitate controlling the average output power. In some aspects, a system may facilitate continuous adjustment of power provided to a device by providing a reference signal with a slope to a control pin (e.g., current control pin) of a control chip (e.g., power regulator or LED driver). Providing a reference signal with a slope (e.g., a triangle or a sinusoidal wave) can increase the control range of the control chip and improve control chip performance. For example, systems and methods of the present disclosure may increase the dimming range of an LED from less than 0.1% to 100%.

Abstract: An LED driver circuit and a method for driving the LED driver circuit. In accordance with an embodiment the LED driver circuit includes a voltage follower circuit and a calibration circuit coupled to the voltage follower circuit. First and second currents may be injected into the node and a current is sunk from the node. In accordance with another embodiment, the LED driver circuit asserts a non-zero voltage across the light emitting diode in a first phase of a drive cycle and asserts a fixed non-zero current in the light emitting diode in a second phase of the drive cycle.

Abstract: Certain aspects relate to systems and techniques for color temperature analysis and matching. For example, three or more camera flash LEDs of different output colors can be used to match any of a range of ambient color temperatures in a non-linear space on the black body curve. The scene color temperature can be analyzed in a preliminary image by determining actual sensor R/G and B/G ratios, enabling more accurate matching of foreground flash lighting to background lighting by the reference illuminant for subsequent white balance processing. The current provided to, and therefore brightness emitted from, each LED can be individually controlled based on the determined sensor response to provide a dynamic and adaptive mix of the output colors of the LEDs.

Abstract: A solid-state lighting system includes a light-emitting device (LED) driver, an LED or plurality of LEDs, a transistor connected in series with the LED or plurality of LEDs, and a current source connected in parallel with the transistor. The LED driver generates a drive signal, which controls the transistor and current flowing through the LED or plurality of LEDs and the transistor. The drive signal is generated in response to a dim control signal, which determines the dim setting of the LED or plurality of LEDs. The current source serves to maintain at least a minimum current through the LED or plurality of LEDs at all times, even when the transistor is turned OFF or is in a high resistance state, thereby preventing large supply voltages from dropping across the transistor and protecting the transistor from undesirably breaking down or being damaged or destroyed.

Abstract: A feedback control circuit, adapted to control a converting circuit to transform an input power into an output voltage for driving an LED module. The feedback control circuit comprises a detection circuit, a PWM circuit, a PWM logic control circuit and a PWM control circuit. The detection circuit is coupled to at least one LED string of the LED module and generates at least one detection signal. The PWM circuit comprises a capacitance, a charging circuit and a discharging circuit, and determines a capacitance voltage of the capacitance to increase, decrease, or maintain. The PWM logic control circuit compares a level of the least one detection signal with a high reference level and a low reference level to control the PWM circuit to adjust the capacitance voltage. The PWM control circuit controls the converting circuit to execute the power transformation in response to the capacitance voltage of the capacitance.

Abstract: A lighting device includes: a first input terminal for receiving an AC voltage phase-controlled by a first phase-control dimmer; a first light source unit which emits light of a first color; a second light source unit which emits light of a second color different from the first color; a control circuit which controls a total amount of light emitted from the first and second light source units and the color of combined light including the light emitted from the first and second light source units. The control signal includes first and second control information. The first control information is for controlling either one of the total amount of light and the color of combined light, and corresponds to the conduction angle of the first phase-control dimmer. The second control information is for controlling the other of the total amount of light and the color of combined light.

Abstract: Lighting circuits and luminaires and methods are disclosed which are operable with a phase-cut dimmer. A circuit includes a rectifier having a low side output and a high side output, a switched mode converter including a switch and an inductor, having a high side input connected to a bus rail, and having a configuration to draw current across a complete mains cycle, a controller for the switched mode converter, a filter circuit connected between the rectifier high side output and the bus rail and including a capacitor connected between the high side output of the mains rectifier and ground, and a resistance connected between the low side output of the rectifier and ground. The value of the resistance may be such the RC time constant of the resistor and filter circuit is greater than the time required for any ringing in the circuit to fall to no more than 20 mA.

Abstract: An LED lighting device includes a luminescent circuit, a detecting circuit, an adjustable current source and a dimming control circuit. The luminescent circuit is driven by a rectified AC voltage for providing light. The detecting circuit is configured to detect a rising edge or a falling edge of the LED current associated with a frequency of the rectified AC voltage. The dimming current regulator is configured to vary a duty cycle of the LED current according to a PWM signal. The dimming control circuit is configured to generate the PWM signal and synchronize a frequency of the PWM signal with the frequency of the rectified AC voltage at the detected rising edge or the falling edge of the rectified AC voltage.

Abstract: The invention provides advances in the arts with useful and novel driver methods. The invention provides circuit driver and control methods for relatively high-current drivers, usable with relatively low-voltage battery power sources. Preferred embodiments include one or more high series resistance capacitors electrically connected with a power source. A low resistance driver circuit regulates power supplied from the capacitors to the load.

Abstract: Aspects of the present invention provide a module including an electronic circuit that flags the presence of AC or DC input signals. An AC filter receives an input signal and couples it to a first leg. The AC filter permits an AC signal to pass to produce a first output and prevents a DC signal from passing. A DC filter also receives the input signal and couples it to a second leg. The DC filter permits a DC signal to pass to produce a second output and prevents at least part of an AC signal from passing. A lock out circuit in the first leg prevents the second leg from producing the second output when the first leg produces the first output. The output of each leg may be digitized and coupled to a logic controller to flag the presence of AC or DC input signals.

Abstract: A system and appertaining method calibrate a color LED light unit comprising at least first-, second-, and third-color LEDs, comprising: a) defining a target color on a color map to calibrate; b) selecting initial calibration coefficients associated with the target color; c) storing the initial or updated calibration coefficients in a non-volatile memory of the light unit; d) controlling the light unit to drive the LEDs to attempt to emit the target color, producing an attempted color, utilizing the calibration coefficients; e) measuring the attempted color to determine if it matches the target color within a predefined tolerance; f) if the attempted color matches the target color, then terminating the method; g) if the attempted color does not match the target color, then performing the following; h) selecting a color component; i) adapting at least one calibration coefficient associated with the selected color component; and j) performing (c)-(i) again.

Abstract: An optical touch module includes an LED circuit board and a control circuit board. Multiple LED components are disposed on one face of the LED circuit board. The other face faces the control circuit board. The other face of the control circuit board is connected with the at least one L-shaped connection board. A first connector and a second connector are positioned in a space between overlapping sections of the LED circuit board and the control circuit board and mated with each other. The control circuit board has at least one third connector mated with a fourth connector of the L-shaped connection board. Electronic components and/or an extension section of a filter member are positioned in the space.

Abstract: A multichannel constant current LED driving circuit can include: (i) a power stage circuit having a power switching transistor, an inductor, and a rectifier circuit, where the power stage circuit is configured to receive a DC bus voltage, and to generate a pseudo-constant output signal to drive a plurality of LED strings; (ii) a current control unit configured to control an average current of each of the plurality of LED strings in accordance with a corresponding one of a plurality of dimming signals; and (iii) the current control unit being configured to control the power switching transistor in accordance with a current feedback signal that represents a current flowing through the LED strings, where the plurality of LED strings are coupled in series to receive the pseudo-constant output signal.

Abstract: An LED module receives current supplied from a variable current source. The LED module includes a first LED that is connected to a variable current source, a bipolar transistor that is series-connected to the first LED and has a resistance that varies depending on magnitude of the current It supplied from the variable current source, and a second LED that is parallel-connected to a series circuit that is composed of the first LED and the bipolar transistor and differs in luminescent color from the first LED.

Abstract: Provided is a circuit for preventing an operating current of a TRIAC dimmer from being dropped below a holding current value. In this regard, a light emitting diode (LED) lighting device includes a TRIAC dimmer for controlling intensity of light emitted from an LED, a load connected between an output terminal of the TRIAC dimmer and a bridge rectifier to stabilize operation of the TRIAC dimmer even in low dimming level periods of the TRIAC dimmer, the bridge rectifier connected with the load to supply an operating current to the LED; and the LED for receiving the operating current from the bridge rectifier.

Abstract: A universal load control module includes a power supply that operates over a wide voltage range, a microcontroller, and one or more functional control blocks. A functional control block includes a dimmer circuit for controlling a lighting load that provides reverse phase cut mode dimming, forward phase cut mode dimming, and hybrid phase cut mode dimming, as well as thermal protection. One or more universal control modules are housed in a cabinet that includes a cabinet control module. The cabinet includes additional thermal protection measures.

Abstract: When a current detection voltage VCS that corresponds to a voltage drop across a detection resistor RCS exceeds a first threshold value VADIM, a current limit comparator asserts a reset pulse. A zero current detection circuit generates a set pulse configured as an instruction to turn on a switching transistor. A logic circuit generates an output pulse S14 according to the reset pulse and the set pulse. When the current detection signal VCS exceeds a second threshold value VTH, a second comparator asserts a comparison signal. An abnormal state detection period is set to a first time period from a time point at which the switching transistor turns on. When the comparison signal is asserted in the abnormal state detection period, an abnormal state detection circuit judges that an abnormal state has occurred.

Abstract: An LED lighting device includes: an LED unit which includes at least one LED device; and a rectifier which rectifies a current power signal output from the ballast and transfers the rectified current power signal to the LED unit. When the ballast is a low-frequency ballast having an output frequency less than 60 Hz, the rectifier opens between a main path for supplying power to the rectifier from the ballast and an auxiliary path for preheating a starter or filament of the ballast. When the ballast is a high-frequency ballast having the output frequency greater than 20 kHz, the rectifier short-circuits between the main path for supplying the power to the rectifier from the ballast and the auxiliary path for preheating the filament of the ballast.

Abstract: The present invention discloses a light emitting device driver chip for driving light emitting devices in series. The chip includes: plural pins electrically connected to corresponding light emitting devices, respectively, wherein an internal voltage is provided through a predetermined one of the pins; a voltage regulation circuit for providing an operation voltage according to the internal voltage; a switch circuit including plural switch groups electrically connected to corresponding pins, respectively; a current source circuit for providing a current to the light emitting devices; and a switch control circuit for controlling the switch groups to determine which light emitting device is turned ON. The light emitting device driver chip does not directly receive the rectified input voltage.

Abstract: The present invention provides a light emitting diode (LED) driving device as a semiconductor device, which comprises: a direct current/direct current (DC/DC) controller, for controlling an output segment that is used to generate an output voltage from an input voltage and supply the output voltage to an LED; an output current driver, for generating an output current of the LED; and an LED short-circuit detection circuit, for monitoring a cathode voltage of the LED to perform an LED short-circuit detection, wherein the LED short-circuit detection circuit controls whether an action is performed or not according to a short-circuit detection enable signal input from outside the LED driving device.

Abstract: A twelve volt electrical outlet assembly comprises an outlet cover comprising first and second openings, first and second outlet sockets adapted to fit in the first and second openings, and a rear housing. The outlet assembly also comprises a first contact disposed on an interior of the rear housing, a second contact coupled to the first and second outlet sockets, a positive insulated conductive wire associated with a 110 volt dual electrical junction box, the positive insulated conductive wire being coupled to the first contact, and a negative insulated conductive wire coupled to the second contact. The positive insulated conductive may be soldered to the first contact, and the negative insulated conductive wire may be soldered to the second contact. A method of installing the twelve volt electrical outlet assembly in a house is also provided.

Abstract: A system and method involving lighting fixtures, a control network, a controller and other devices such as light sensors, input devices and network adapters for coordinating precise brightness and color schedules among the lighting fixtures while maintaining a high color reliability including provisions for managing a plurality of lighting fixtures. The lighting fixtures contain lighting elements selected such that when controlled properly, operating along a daytime locus, the resultant light output closely resembles sunlight on a cloudless day in spectral characteristics, and wherein the total flux of blue light can be adjusted from a relative level of 1-100% the maximum blue flux of the lighting fixture by controlling individual lighting elements.

Abstract: A driver circuit (11) for a current regulator (13), which can be coupled in series to an electrical load (14), comprises a control circuit (12) for controlling the current regulator (13). The control circuit (12) is designed to determine at least two target current values (SW1) for the current regulator current (IS1) of the current regulator (13) for at least two points in time in an operation phase on the basis of a signal (VS1, STR) that can be tapped at the current regulator (13).

Abstract: A controller and method for operating a controller are disclosed. In an embodiment, a method involves in a mode-setting phase, polling connection pins to sense the presence and/or magnitude of a respective relatively high impedance connected between a respective connection pin and a predetermined electrical potential, and/or other connection pins to sense the presence and/or magnitude of a respective further impedance connected between the respective connection pin and a predetermined electrical potential. The method also involves selecting an operational mode from a plurality of possible operational modes. In an operational phase, the method involves operating in the selected operational mode, including providing a respective drive signal having a relatively low output impedance from each of the first group of connection pins, and measuring a sense voltage on each of the second group of connection pins.

Abstract: A driving circuit for light-emitting diodes includes a power unit providing an input voltage, a voltage regulation unit providing a voltage-increasing loop and a voltage-decreasing loop and having an energy-storing capacitor with an intermediate voltage therebetween, a current control unit generating a driving current for the light-emitting diodes according to the intermediate voltage, and a switching control unit. The switching control unit generates a reference voltage based on the input voltage and compares the reference voltage with a feedback voltage associated with driving current. The switching control unit controls the voltage regulation unit to increase the intermediate voltage through the voltage-increasing loop when the feedback voltage is smaller than the reference voltage. The switching control unit controls the voltage regulation unit to decrease the intermediate voltage through the voltage-decreasing loop when the feedback voltage is larger than the reference voltage.

Abstract: A light emitting diode driving system is applied to a light emitting diode lamp string, such that the light signal is carried through a power line to reduce the signal transmission lines. The light emitting diode driving system includes a switch unit, a control unit and a light signal generating unit. The switch unit includes a power input side, a power output side and a controlled side. The power output side is electrically connected to the light emitting diode lamp string. The control unit is electrically connected to the switch unit. The light signal generating unit is electrically connected to the control unit and the power output side. The light signal generating unit generates a light signal when the control unit turns off the switch unit. The light signal generating unit sends the light signal to the light emitting diode lamp string.

Abstract: A device for controlling the amount of energy stored in a storage device comprises a control unit that is adapted to adjust the power received via an input of the device, based on the amount of energy currently stored in the storage device, and that is further adapted to output the adjusted power via an output of the device to the storage device.

Abstract: An LED-based lighting apparatus comprises a rectified AC voltage source having a rectified output connected to a storage capacitor through a switching device, a plurality of LED segments controlled by a linear driving circuit and at least one charging path connected between the LED segments and the storage capacitor. One or more controllable linear LED driving units may be connected in parallel with the storage capacitor to provide balance between reducing flicker and increasing power factor of the lighting apparatus.

Abstract: Apparatus and associated methods involve operation of an LED light engine in which a relative intensities of selected wavelengths shift as a function of electrical excitation. In an illustrative example, current may be selectively and automatically diverted substantially away from at least one of a number of LEDs arranged in a series circuit until the current or its associated periodic excitation voltage reaches a predetermined threshold level. The diversion current may be smoothly reduced in transition as the excitation current or voltage rises substantially above the predetermined threshold level. A color temperature of the light output may be substantially changed as a predetermined function of the excitation voltage. For example, some embodiments may substantially increase or decrease a color temperature output by a solid state light engine in response to dimming the AC voltage excitation (e.g., by phase-cutting or amplitude modulation).

Abstract: An auxiliary power supply circuit of a two wire dimmer, comprising: an auxiliary source capacitor (20) and a cutoff switch (30) constituting a series branch, a chopper switch (10) parallel-connected to the series branch, and a control device (40) connected to the chopper switch (10) and to the cutoff switch (30). The control device (40) measures an auxiliary source voltage and receives a chopper voltage control signal (Vg), and outputs signals (V1 and V2), on the basis of the result of a comparison between the auxiliary source voltage and a preset voltage and of the state of the chopper voltage control signal (Vg), to control the on and off of the chopper switch (10) and of the cutoff switch (30) for controlling the charging of the auxiliary source capacitor (20). The auxiliary power supply circuit has low losses, high efficiency, and is not limited by minimum chopper angle, and has low electromagnetic interference.

Abstract: The switching current control circuit includes a switching pulse supply circuit, a comparator circuit, and analog circuit unit, a digital circuit unit, etc. The A/D converter (2) detects a load current in an ON period of a switching pulse as a detected current, and converts it into digital data. The arithmetic control circuit (3) calculates a lower limit of the detected current for providing a timing of switching from OFF to ON of the switching pulse, based on the converted data. Continuation/discontinuous modes are determined whether the lower limit is equal to or greater than 0.

Abstract: A display panel including: a cathode electrode formed in a cathode region of the display panel, the cathode electrode entirely covering an active region of the display panel a plurality of pixel units in columns and rows in the active region of the display panel; a ring-shaped edge negative voltage line formed in a ring-shaped edge portion of the cathode electrode configured to supply a negative power supply voltage to the cathode electrode; and a plurality of compensation negative voltage lines connected to the ring-shaped edge negative voltage line, the compensation negative voltage lines extending along a column direction of the display panel and arranged along a row direction of the display panel.

Abstract: Each light source to be controlled by a lighting control system is associated with a light identifier, and the light sources can be installed in any desired manner without regard to which light identifier is mapped to which light source by the system. After installation, a user provides inputs for mapping each light to its appropriate identifier. Accordingly, the installation process is simplified, and errors that otherwise could arise by an installer incorrectly installing light sources relative to the light identifier mappings used by the system are prevented.