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49results about How to "Solve the problem of strobe" patented technology
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High-power-factor low-harmonic-distortion constant current circuit and device
ActiveCN103683919ASimple structureLow costDc-dc conversionElectric variable regulationLevel structureTotal harmonic distortion
The invention provides a high-power-factor low-harmonic-distortion constant current circuit and device. The circuit comprises a front-level circuit and a rear-level circuit which are coupled mutually, wherein the front-level circuit is a boost-buck circuit used for correcting a power factor, the rear-level circuit is a buck circuit used for direct current-direct current conversion, and moreover the front-level circuit and the rear-level circuit share the same switching tube and the same bus capacitor. Compared with a two-level structure, the devices are fewer, and cost is lower; compared with a single-level buck structure, the output load current ripple is smaller, and the constant current circuit is higher in power factor and lower in total harmonic distortion.
Owner:HANGZHOU SILAN MICROELECTRONICS
Organic light-emitting device with long service life
ActiveCN104362258ABrightness unchangedSolve the problem of strobeSolid-state devicesSemiconductor/solid-state device manufacturingPulse voltageOptoelectronics
The invention discloses an organic light-emitting device with long service life. The organic light-emitting device comprises a first electrode, a second electrode and an organic light-emitting element containing a phosphorescent light emitting layer or a delayed fluorescence light emitting layer between the first electrode and the second electrode. The organic light-emitting device further comprises a pulse alternating-current drive circuit driven by forward pulse voltage V1 or forward pulse current I1 so that the organic light-emitting element can emit light. The pulse alternating-current drive circuit applies inverse pulse transient pulse voltage V2 reverse to the forward pulse voltage V1 or the forward pulse current I1 after applying the forward pulse voltage V1 or the forward pulse current I1. The application control time of the inverse pulse transient pulse voltage V2 in each cycle is less than or equal to 10 micro seconds. According to the organic light-emitting device with long service life, the service life of a screen of the organic light-emitting device is effectively prolonged on the condition that stroboflash is reduced.
Owner:BEIJING VISIONOX TECH +1
Healthy and smart classroom lighting system
ActiveCN107949115AAdapt to visual requirementsSolve the problem of strobeLighting support devicesElectrical apparatusEngineeringLighting system
A healthy and smart classroom lighting system comprises a server, a host computer and a plurality of classroom overall light systems. The server is connected with the host computer. The host computeris connected with each classroom overall lighting system through a local area network; the classroom overall lighting system includes a central processor, a control device and a plurality of lamp systems installed in the classroom, and the central processor is connected to the host computer; the lamp system includes a ZigBee receiving control module, a driving power supply, a load lamp, a light color control processor MCU, and a light color sensor; and the lamp system includes a blackboard light system in a blackboard lighting zone, a teacher light system in a teacher teaching zone, and a classroom light system in a student learning zone. The healthy and smart classroom lighting system solves the problems of stroboscopic flash, glare, illumination and light color coordination, and uses anintelligent control system to adapt the visual requirements of the students in different classroom activity scenes through an intelligent natural light compensation module and a mode preset control function.
Owner:GUANGZHOU LEDIA LIGHTING CO LTD
Low frequency ripple suppression circuit and control method
PendingCN108513407ASolve the problem of strobeEfficient removalElectrical apparatusElectroluminescent light sourcesEnergy transferCapacitance
The invention discloses a low frequency ripple suppression circuit and a control method. The low frequency ripple suppression circuit comprises an energy buffer and ripple suppression unit and an AC-DC power factor correction type constant current source circuit, wherein the energy buffer and ripple suppression unit is connected in parallel to a constant current source output voltage Vled of the front stage AC-DC power factor correction type constant current source circuit; the AC-DC power factor correction constant current source circuit is used for realizing power factor correction while providing a constant current output for the load; the energy buffer and ripple suppression unit is used for realizing front stage output voltage Vled low ripple; when the output voltage Vled of the frontstage AC-DC power factor correction type constant current source circuit rises instantaneously, energy on a second capacitor is transferred onto a first capacitor to charge the first capacitor; and when the output voltage Vled of the front stage AC-DC power factor correction type constant current source circuit drops instantaneously, the energy on the first capacitor is transferred onto the second capacitor to discharge the first capacitor. Through adoption of the low frequency ripple suppression circuit, LED load ripple can be reduced while ensuring no energy loss and increasing the system efficiency.
Owner:SHENZHEN KIWI MICROELECTRONICS CO LTD +1
Circuit capable of solving problem of high-voltage linear driving strobing
InactiveCN103906289ASimple circuit connectionSolve the problem of strobeElectric light circuit arrangementCapacitancePower factor
The invention discloses a circuit capable of solving the problem of strobing of an LED high-voltage linear constant-current driving scheme. The circuit comprises a rectifying circuit body, a high-voltage linear constant-current driving IC body, an LED lamp string and a capacitor charging and discharging circuit body. The rectifying circuit body converts directly-input alternating-current voltage signals into pulse direct-current signals. The high-voltage linear constant-current driving IC body converts the pulse direct-current signals into voltage applicable to each segment of LEDs in a sectional mode and proper constant currents are provided for the LEDs. The LED lamp string comprises the LEDs and an isolating diode. The capacitor charging and discharging circuit body comprises a capacitor charging circuit and a capacitor discharging circuit. When the high-voltage linear constant-current IC body is connected, a capacitor is charged. When the high-voltage linear constant-current driving IC body is disconnected, the capacitor discharges to provide energy for the LEDs connected with the capacitor in parallel. Thus, it can be guaranteed that each segment of the LEDs is always turned on in the whole input voltage cycle, and the whole circuit solves the problem of strobing of an LED device on the condition that the input power factor and harmonic waves are not affected.
Owner:广州瀚富新材料科技有限公司
Integrated LED driving power supply compatible with electronic transformer
ActiveCN108770117AMeet the requirements of capacitive loadMeet minimum load current requirementsElectrical apparatusElectroluminescent light sourcesCapacitanceDc dc converter
The invention discloses an integrated LED driving power supply compatible with an electronic transformer; the integrated LED driving power supply comprises an electronic transformer and a rectifier bridge; the output end of the electronic transformer is connected with the input end of the rectifier bridge, and the output end of the rectifier bridge is connected with an input filter capacitor C1 inparallel; the integrated LED driving power supply further comprises a front-stage PFC converter and a rear-stage DC-DC converter; the input end of the front-stage PFC converter is connected to the output end of the rectifier bridge, and the front-stage PFC converter and the rear-stage DC-DC converter are integrated through a single switching tube S1, wherein a direct-current component and an alternating-current component of transient input power are decoupled by a decoupling capacitor Cd therebetween; the alternating current component is stored in the decoupling capacitor Cd; and the direct current component passes through the rear-stage DC-DC converter to output a stable a direct current output voltage which does not comprise two-time power frequency ripples. By virtue of the integratedLED driving power supply, the problem of capacitive load is solved, direct-current voltage ripples of the front-stage output are eliminated, and the problem that a single-stage PFC scheme output comprises two-time power frequency ripples is solved; and in addition, the integrated LED driving power supply has the characteristics of being small in circuit size and low in cost, and can better satisfythe requirements of an MR16 illuminating system.
Owner:SICHUAN UNIV
LED linear dimming drive circuit
ActiveCN106879126AExtended service lifeSolve the problem of strobeElectrical apparatusElectroluminescent light sourcesVoltage regulator moduleElectricity
The invention relates to an LED linear dimming drive circuit which comprises an input module, a rectifier module connected with the input module, a voltage regulator module and a power control module connected with the rectifier module, and an LED load module. The LED linear dimming drive circuit further comprises a regulation module of which a first end is connected with the voltage regulator module and a second end is connected with the power control module. According to the LED linear dimming drive circuit, commercial power is converted into steady DC power, the DC power is compared with the current of a regulator through an operational amplifier, the magnitude of current flowing through the LED load module is controlled linearly, and thus, the luminous brightness of LED is regulated. The problem of LED light flickering caused by other nonlinear ways of dimming is avoided. The service life of LED is prolonged.
Owner:DONGGUAN PAN AMERICAN ELECTRONICS CO LTD
A paper defect detection method based on local brightness invariance priori
ActiveCN109886914AImprove accuracySolve the problem of strobeImage analysisOptically investigating flaws/contaminationColor imageGray level
The invention relates to a paper defect detection method based on the local brightness invariance priori, which comprises the following steps of 1, photographing the surface of paper to be detected byusing a color area array camera, and capturing a frame of color image with a pixel format of RGB components; 2, carrying out nonlinear graying operation on all pixels of the color image in the mask of the convolution template by using a convolution template with local brightness invariance priori, and finally obtaining pixels corresponding to the convolution window; according to the 1*1 convolution operation and the 3 * 3 convolution operation, obtaining two gray level images respectively; 3, carrying out corresponding position pixel division on the two grayscale images to obtain a grayscaleimage; 4, performing 3 * 3 Fourier convolution operation on the grayscale image; 5, performing gradient morphological operation on an operation result; 6, performing thresholding processing to obtaina paper defect detection result. According to the present invention, a common light source and an area array camera can be used for detecting paper defects, and a detection system is low in complexity, high in accuracy and low in cost.
Owner:浙江企银印务科技有限公司
Parking stall guiding method and device
InactiveCN106599921AAvoid strobeSolve the problem of strobeIndication of parksing free spacesCharacter and pattern recognitionReal-time computingFree state
The invention discloses a parking stall guiding method and device. The method includes obtaining a plurality of vehicle-free state frame images of a parking stall, and adding to a background queue; when stroboflash of a parking stall indicator light is judged to occur, obtaining a current frame image of the parking stall; calculating Euclidean distance between an HOG feature of the current frame image and an HOG feature of each vehicle-free state frame image in the background queue, and determining a parking stall state of the current frame image; and controlling the turning-on state of the parking stall indicator light through the parking stall state of the current frame image. The method solves the problem of stroboflash of the indicator light.
Owner:SHENZHEN JIESHUN SCI & TECH IND
LED driving circuit
ActiveCN105188197AControl response speedReduce current rippleElectric light circuit arrangementControl signalResonance
The invention provides an LED driving circuit. The LED driving circuit is characterized by comprising a resonance transformation main circuit and a control circuit. The control circuit comprises a comparison circuit, a setting circuit and a parameter transformation circuit. The control circuit detects output currents and output voltages of the resonance transformation main circuit, superposes the output currents and the output voltages as currently superposed values in the setting circuit, according to the size relation between the currently superposed values and a reference superposed value, decides whether the parameter transformation circuit is at a rapid loop state or a slow loop state, and accordingly controls the response speed of the comparison circuit in outputting control signals. In such a way, when the output currents are quite small and the output voltages are quite low, the resonance transformation main circuit, if entering a hiccup mode, can enable the control circuit to rapidly respond to the output voltages and the output currents of the resonance transformation main circuit so that the hiccup efficiency is improved, current ripples output by the resonance transformation main circuit are reduced, and the stroboscopic or scintillation phenomenon of an LED load connected with an LED driver is solved.
Owner:INVENTRONICS HANGZHOU
Method for driving LED with the use of alternating current
InactiveCN103747563AEliminate stroboscopic phenomenonSolve the problem of strobeElectric light circuit arrangementCapacitanceEngineering
The invention belongs to the field of LED lamps and relates to a method for driving an LED with the use of alternating current. The method is characterized in that an LED light emitting body is driven by making use of at least two different phases of current of alternating current. The stroboscopic problem in the process of driving an LED with the use of alternating current is solved; compared with the direct-current drive technology, the advantages of high reliability, high efficiency, small size, low additional power consumption, long service life, low manufacture cost, low use cost and the like are achieved as a special driving power supply is omitted; and compared with the prior alternating-current drive technology, the advantages of high reliability, high efficiency, small size, low additional power consumption, long service life, low manufacture cost, low use cost and the like are achieved as a current limiting resistor, a step-down capacitor and a choke inductor are omitted. The method is an LED driving method with obvious economic and social benefits and high cost performance.
Owner:ZHEJIANG NORMAL UNIVERSITY
LED driving module
ActiveCN111542148ASolve the problem of strobeGood dimming effectElectrical apparatusHemt circuitsLight signal
The invention relates to an LED driving module. The LED driving module comprises a PWM detection circuit which is used for detecting and outputting a PWM dimming signal; a linear dimming circuit whichis used for controlling the sampling voltage to be reduced along with the reduction of the duty ratio of the PWM dimming signal according to the PWM dimming signal; a PWM processing circuit which isused for outputting a first level when the duty ratio of the PWM dimming signal exceeds a set value, and outputting a second level when the duty ratio of the PWM dimming signal does not exceed the setvalue; and a selection circuit which is used for inputting the PWM dimming signal into the control end of the switching tube for PWM dimming when the PWM processing circuit outputs the first level, and starting the linear dimming circuit for linear dimming when the PWM processing circuit outputs the second level. By combining PWM dimming with linear dimming, the problems of stroboflash and dimming depth in PWM dimming can be solved to the maximum extent, and the LED dimming effect is optimized.
Owner:深圳深爱半导体股份有限公司
Lighting system
InactiveCN110337160AAvoid flickering light sourcesGuaranteed dimming accuracyElectrical apparatusElectroluminescent light sourcesIntegrated circuitLighting system
The invention provides a lighting system, which comprises an integrating circuit, a driving circuit and a light source. A pulse width modulation signal is connected into the input end of the integrating circuit, and the integrating circuit is used to convert the pulse width modulation signal into an analog signal. The control end of the driving circuit is connected into the output end of the integrating circuit. The output end of the driving circuit is connected with the light source. The duty cycle corresponding to the pulse width modulation signal is directly proportional to the voltage corresponding to the analog signal. The lighting system of the invention avoids the stroboflash problem of the light source caused by direct PWM dimming. At the same time, because the voltage value of theanalog signal output by the integrating circuit is directly proportional to the duty cycle of the input pulse width modulation signal, the process of adjusting the brightness of the light source through the analog signal is synchronized with the PWM dimming signal. Therefore, flicker-free dimming is realized on the premise of ensuring the dimming accuracy, and the damage to the human body causedby the stroboflash of the light source is avoided.
Owner:MIDEA INTELLIGENT LIGHTING & CONTROLS TECH CO LTD
Display brightness adjusting device and display device
ActiveCN110504388AAvoid harmBrightness adjustableStatic indicating devicesSolid-state devicesPolarizerOptoelectronics
The invention relates to a display brightness adjusting device and a display device. The display brightness adjusting device comprises a first polarizer, a polarization adjusting layer and a second polarizer; the polarization adjusting layer is arranged at one side of the first polarizer, and is used for changing the polarization direction of light penetrating through the first polarizer; and thesecond polarizer is arranged at one side of a polarization direction adjusting layer away from the first polarizer. The display brightness can be adjusted by enabling the light emitted from a displaypanel to pass through the first polarizer, the polarization adjusting layer and the second polarizer, wherein the polarization state of the light emitted by the display panel changes after passing through the polarization adjusting layer, thus the brightness of the light emitted from the second polarizer can be adjusted, so that the display brightness is adjusted, and the problem that the displaydevice is stroboscopic caused by adjusting the brightness of the display device through PWM is solved.
Owner:HEFEI BOE DISPLAY TECH CO LTD +1
Local area dimming driving circuit, method and system and electronic equipment
ActiveCN114023273AImprove the display effectAvoid strobeStatic indicating devicesEngineeringControl circuit
The invention discloses a local dimming driving circuit, method and system and electronic equipment. The local dimming driving circuit comprises a dimming control circuit and a constant-current driving circuit; the input end of the dimming control circuit is connected with the mainboard, the output end of the dimming control circuit is connected with the input end of the constant-current driving circuit, and the output end of the constant-current driving circuit is connected with the backlight lamp panel; the main board is used for providing first backlight brightness data and a first vertical synchronizing signal; the dimming control circuit is used for obtaining second backlight brightness data according to the first backlight brightness data and outputting the second backlight brightness data at the refresh frequency of the first vertical synchronizing signal, and is also used for outputting a second vertical synchronization signal, wherein the refresh frequency of the second vertical synchronization signal is a preset value greater than the refresh frequency of the first vertical synchronization signal; and the constant-current driving circuit is used for driving the backlight lamp panel to display according to the second backlight brightness data when receiving the second vertical synchronizing signal. The stroboscopic problem of the display panel is improved, and picture switching is smoother.
Owner:SHENZHEN SKYWORTH RGB ELECTRONICS CO LTD
Track mirror advertisement projection display system and method
ActiveCN109064948AAchieve the purpose of integrationAttractiveProjectorsAdvertisingFixed frameControl data
The invention relates to a track mirror advertisement projection display system and method. The system comprises a projector, an imaging mirror, a fixing frame, a media sever and a rotating mechanism;an image protected by the projector is projected to any position through the imaging mirror, the rotating mechanism is used for controlling the imaging mirror to rotate, a controller is connected with the media server, the projector and the rotating mechanism separately, the controller calls advertisement video data to control the projector to play, and rotating mechanism control data is called to control the rotating mechanism to rotate. By combining the track mirror mirror system with advertisement display, when corresponding advertisement content is played, attractiveness, interestingness,playability, interactivity and the like are better achieved, and the public is easy to accept; by means of the media server, advertisement video data is stored, playing is conducted, the purpose of fusing the track mirror system and advertisements is achieved, and a new business model is shown.
Owner:上海长诺文化创意有限公司
Stroboflash-free active power factor correcting circuit applied to LED drive
ActiveCN104578749ASolve the problem of strobeEliminate 2 times the power frequency rippleEfficient power electronics conversionElectric light circuit arrangementCapacitanceLoad circuit
The invention discloses a stroboflash-free active power factor correcting circuit applied to LED drive. The stroboflash-free active power factor correcting circuit applied to LED drive comprises a rectifying circuit, a filtering capacitor, a first-level inductor, a control chip, a power tube, a transformer and an LED load circuit and is characterized by further comprising an energy storage capacitor, a first switch tube and a second switch tube, wherein one end of the first-level inductor is connected with the output end of the rectifying circuit, the other end of the first-level inductor is connected with the drain electrode of the power tube and the positive pole of the energy storage capacitor, the transformer comprises at least one main coil, one end of the main coil of the transformer is connected with the source electrode of the power tube through a sampling resistor, and the other end of the main coil of the transformer is in parallel connection with the negative pole of the energy storage capacitor. The stroboflash-free active power factor correcting circuit provides direct current constant source through the energy storage capacitor, two times of ripple waves of power frequency are eliminated, no stroboflash is output while power factor correction, the circuit is simplified, and cost is reduced.
Owner:CRM ICBG (WUXI) CO LTD
Rear-mounted LED dimming control device and method
PendingCN108770137AAvoid flickeringSolve the unstable outputElectrical apparatusElectroluminescent light sourcesSupply managementComputer module
The invention relates to the technical field of IoT (Internet of Things) and illumination, and discloses a rear-mounted LED dimming control device. The rear-mounted LED dimming control device comprises a rear-mounted LED dimming control device; and a wide-voltage DC (Direct Current) power supply interface is fixedly mounted outside the left side of the rear-mounted LED dimming control device. Therear-mounted LED dimming control device and method, by a built-in backup power supply management module, solve a problem of unstable output of 0 to 10V, which is caused by conversion of a DC voltage output by a LED power supply in the 0-10V dimming process, avoid lamp flicker caused by feedback in the dimming process, have an input and output voltage and current sampling function, and can completeload detection of a LED lamp; in the dimming process of the LED lamp, a wide voltage output by a power supply under the drive of the LED lamp can be changed; and in the changing process, an independent power supply system in a dimming control feedback module can ensure that a signal output in the dimming process is stable and cannot be changed along with conversion of the power supply voltage, soas to avoid a stroboflash problem in the dimming process.
Owner:WUHAN WEIZHICHUANGDA TECH CO LTD
Silicon-controlled dimming LED (Light Emitting Diode) driving method and circuit
PendingCN109587880ASolve the problem of strobeNo flickerElectrical apparatusElectroluminescent light sourcesCapacitanceSilicon-controlled rectifier
The invention provides a silicon-controlled dimming LED (Light Emitting Diode) driving method and circuit. The method comprises the steps of acquiring charging time of an energy-storage charging capacitor; and regulating and controlling a break-over current of an LED lamp string according to the charging time. With the silicon-controlled dimming LED driving method and circuit, the stroboflash in silicon-controlled dimming can be eliminated and the market requirements for LED illumination can be satisfied.
Owner:SHAANXI REACTOR MICROELECTRONICS
Stroboflash-free high-precision constant-current LED (light emitting diode) drive circuit and operating method thereof
InactiveCN104202884ASolve the problem of strobeImprove reliabilityElectric light circuit arrangementOvervoltageStored energy
The invention relates to a stroboflash-free high-precision constant-current LED (light emitting diode) drive circuit and an operating method thereof. The high-precision constant-current LED drive circuit comprises an LED drive and an energy storage unit connected with the LED drive, the LED drive is internally provided with an MOS (metal oxide semiconductor) tube and a feedback signal input end, and the energy storage unit is coupled with a feedback circuit to acquire feedback signals which are inputted into the feedback signal input end. The stroboflash-free high-precision constant-current LED drive circuit has the advantages that by the aid of the LED drive internally provided with the MOS tube and the feedback signal input end, integrity of the drive circuit is improved, and the problem of LED stroboflash can be avoided only by one LED drive; a peripheral circuit of the LED drive circuit is more simplified by an internal overvoltage protector, and high reliability is achieved; the LED drive is free of hiccups and is directly locked when an output voltage is higher than an overvoltage protection reference voltage, so that the LED drive is further protected.
Owner:山东申鑫电子有限公司
Intelligent lighting system
The invention provides an intelligent lighting system comprising a first control module used for receiving a control instruction of a user and converting the control instruction into corresponding light source demand information; the second control module is connected with the first control module, and the second control module is used for receiving the light source demand information and generating a corresponding PWM control signal at regular time according to the light source control information; and converting the PWM control signal into a corresponding direct-current voltage signal through a GP8500 chip so as to control the target illuminating lamp to emit light with corresponding color temperature and illuminance value. Therefore, the PWM wave is used as the output to control the dimming of the target illuminating lamp, and the conversion with the direct-current voltage is realized through the GP8500 chip, so that the stroboflash problem in the PWM dimming is effectively solved.
Owner:JIANGSU UNIV OF TECH
A multi-channel metamerism visible light communication method and system
InactiveCN107919909BSolve the transmission signalTroubleshoot lighting performance issuesClose-range type systemsComputer scienceVisible light communication
Owner:SHENZHEN UNIV
Circuit with auxiliary optocoupler and switching method thereof
PendingCN114650635AImprove reliabilityFast and reliable light attenuation rate caused by high temperature environmentElectrical apparatusHemt circuitsControl theory
The invention discloses a circuit with an auxiliary optocoupler and a switching method thereof, the circuit is used for being connected between an output end signal and an input end feedback of a switching power supply, the circuit comprises a circuit between a primary side and a secondary side of a transformer T1, the primary side of the transformer T1 is connected to an output end Output-sine of an auxiliary optocoupler circuit through a control circuit model-1, and the secondary side of the transformer T1 is connected to an output end Output-sine of the auxiliary optocoupler circuit through a control circuit model-2. The secondary side of the transformer T1 is connected to the input end Input-signal of the auxiliary optocoupler circuit through a dimming circuit model-2; the problem that the optical coupler in the power supply is high in light attenuation decline rate due to a high-temperature environment during working can be effectively avoided, and the reliability of the switching power supply is improved.
Owner:TIANCHANG FUAN ELECTRONICS CO LTD
A led drive circuit
ActiveCN105188197BControl response speedReduce current rippleElectric light circuit arrangementControl signalHemt circuits
The present application provides an LED driving circuit, which is characterized in that it includes: a resonant conversion main circuit and a control circuit; wherein, the control circuit includes: a comparison circuit, a setting circuit and a parameter conversion circuit. The control circuit detects the output current and output voltage of the resonant conversion main circuit, and superimposes the output current and output voltage in the setting circuit as the current superimposed value. According to the relationship between the current superimposed value and the reference superimposed value, it is determined that the parameter conversion circuit is in the fast loop. loop state or slow loop state, and then control the response speed of the comparison circuit outputting the control signal. In this way, when the output current is small and the output voltage is low, if the resonant conversion main circuit enters the hiccup mode, the control circuit can quickly respond to the resonant conversion main circuit output voltage and output current, thereby increasing the hiccup frequency and reducing the output of the resonant conversion main circuit. Current ripple, so as to solve the stroboscopic or flickering phenomenon of the LED load connected to the LED driver.
Owner:INVENTRONICS HANGZHOU
LED dimming method and device
ActiveCN106920521BSolve the problem of strobeGood effectStatic indicating devicesOptoelectronicsLight modulation
The present invention relates to a LED light modulation method and device. The method is used for at least two groups of LED light sources, and comprises: input pulse current to the first group of the LED light source; inputting constant current to the second group of the LED light source; obtaining light source information obtained by mixing the first group of the LED light source and the second group of the LED light source, and regulating the width of the pulse current and / or the size of the constant current according to the light source information. The LED light modulation method and device overcome the stroboscopic problem of traditional PWM light modulation so as to improve the effect of the LED output light source.
Owner:GUANGZHOU SHIYUAN ELECTRONICS CO LTD
A High Power Factor Multi-channel Low Ripple Constant Current Output Switching Converter
ActiveCN108809090BHigh accuracy of current sharingSmall rippleEfficient power electronics conversionElectroluminescent light sourcesCapacitancePower factor
Owner:SICHUAN UNIV
Stroboflash-free eye protection table lamp control system
PendingCN110996450ASolve the problem of strobeSmall fluctuation depthElectrical apparatusSemiconductor lamp usageLuminous intensityProtecting eye
The invention discloses a stroboflash-free eye protection table lamp control system. The system comprises a micro-control unit module, and the micro-control unit module is electrically connected withan LCD display module, a touch key module, a power supply management module, an LED light source driving module, a learning time timing module and a sitting posture adjusting module. The power supplymanagement module is unidirectionally and electrically connected with an LED light source, and the LED light source is bidirectionally and electrically connected with the LED light source driving module. The stroboflash-free eye protection table lamp control system is equipped with an LED light source module, a stroboflash-free LED driving module and a stroboflash test module, the stroboflash problem of an LED eye protection table lamp can be well solved; after the brightness and the color temperature of the LED desk lamp are adjusted, the fluctuation depth of the luminous intensity of the LEDeye protection desk lamp is small, the change of the brightness is small, and the stroboflash-free effect can be basically achieved; the test measurement of the fluctuation depth and a stroboflash curve can be completed by a low-cost method, and a better use prospect is brought.
Owner:苏州优童智能科技有限公司
High power factor low harmonic distortion constant current circuit and device
ActiveCN103683919BSimple structureLow costDc-dc conversionElectric variable regulationLevel structureTotal harmonic distortion
Owner:HANGZHOU SILAN MICROELECTRONICS
LED driving power supply
PendingCN111885773ASolve the problem that the dimming and shutdown function cannot be truly realizedMeet normal workElectrical apparatusControl theoryElectrical and Electronics engineering
The invention discloses an LED driving power supply which comprises a filter circuit, a first non-isolated DC / DC power supply circuit and a second non-isolated DC / DC power supply circuit which are connected in sequence. The main power switch tubes in the first non-isolated DC / DC power supply circuit and the second non-isolated DC / DC power supply circuit are arranged on a bus, one is arranged at ahigh-voltage end, and the other is arranged at a low-voltage end. Under the condition that the cost is not increased, the main power switch tube in the non-isolated DC / DC power supply circuit not onlymeets the normal work of the LED driving power supply, but also blocks the electric leakage of the LED driving power supply, so that the problem that the dimmable LED driving power supply in the prior art cannot truly realize the dimming turn-off function is solved; in addition, the stroboflash problem of the LED driving power supply can be effectively solved, the PF value is increased, the lossis reduced, and the input and output range of the LED driving power supply is wide.
Owner:MORNSUN GUANGZHOU SCI & TECH
Control method and controller
PendingCN114007305ARealize dimming functionSolve the problem of strobeElectrical apparatusEnergy saving control techniquesSilicon-controlled rectifierDriving current
The invention discloses a control method and a controller. The control method is applied to a silicon controlled LED dimming power supply, and in each work cycle of the power supply, the control method comprises the following steps of: a voltage conversion step, specifically, converting a voltage VB representing the magnitude of a bus voltage into a differential voltage V1; a zero-crossing detection step, specifically, detecting the voltage VB, and outputting a zero-crossing signal Vz after detecting that the voltage VB is reduced from high to low; a counting step, specifically, receiving the differential voltage V1, performing resetting when receiving the differential voltage V1, starting counting through a timing reference, and outputting a real-time counting value; a conduction angle detection step, specifically, receiving the zero-crossing signal Vz, and when receiving the zero-crossing signal Vz, collecting a counting value output at the moment in the counting step, and recording the counting value as Count3; an LED current threshold value adjusting step, specifically, generating a reference voltage according to control signals; and a constant current step, specifically, adjusting the magnitude of power supply output driving current according to the reference voltage. According to the control method, in each work cycle of the power supply, the control signals are alternately output according to a first rule or a second rule. According to the control method and the controller of the invention, the stroboflash of an LED can be avoided, and dimming can be realized at the same time.
Owner:SHENZHEN NANYUN MICROELECTRONICS CO LTD
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