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48results about How to "Change duty cycle" patented technology
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Low and intermediate frequency wireless receiver with calibrating circuit
InactiveCN1801634AImprove Interference RejectionOptimize phaseTransmissionCapacitanceFrequency mixer
The invention discloses a low-intermediate frequency wireless receiver with calibration circuit, which comprises: a high-speed frequency divider with an added differential offset current tunable array to change local oscillator duty ratio by fine tuning offset current and realize coarse tuning for image frequency interference phase, and a frequency mixer with a resistive load tunable array to eliminate amplitude mismatch as image frequency interference and a switch capacity load tunable array to realize fine tuning for image frequency interference phase. This invention improves the mismatch from asymmetry and technology error and suppression function to interference.
Owner:南京紫宸鼎芯微电子有限公司
PWM (pulse width modulation) dimming method and device for LED (light-emitting diode)
InactiveCN102833905ARealize dimming controlEasy to use hardwareElectric light circuit arrangementEnergy saving control techniquesSingle chipComputer science
The invention provides a PWM (pulse width modulation) dimming method for an LED (light-emitting diode). The PWM dimming method comprises the following steps: starting a first timer in an interrupt mode and a second timer in a free counting mode of a single chip microcomputer; making statistics on the number of interrupts of the first timer and count values of the second timer during the brightness change stage of the LED; performing at least one zero clearing on the count values of the second timer during the statistical process; and comparing the number of interrupts with the count values in real time, and outputting a PWM wave the level value of which changes along with the comparison result, wherein the PWM wave is applied to the LED for regulating the brightness of the LED. The invention further provides a dimming device corresponding to the method. The PWM dimming method and device for the LED disclosed by the invention can solve the problem of few PWM output ports of the existing cheap single chip microcomputer.
Owner:BSH ELECTRICAL APPLIANCES JIANGSU
Novel variable mist spraying system based on unmanned rotorcraft
InactiveCN105984588AChange speedChange duty cycleAircraft componentsMovable spraying apparatusWater savingControl system
The invention relates to a novel variable mist spraying system based on an unmanned rotorcraft. The novel variable mist spraying system consists of three parts, i.e. an electric centrifugal spray head speed regulating system, a remote control system and a host computer system. The electric centrifugal spray head speed regulating system comprises an ARM main controller, a sensor and a spray head; the remote control system comprises an ARM main controller, an LCD and keys; and the host computer system can display the sensor data and transmit an instruction to change a PWM duty ratio. The whole system has two modes, i.e. a manual mode and an automatic mode. At the manual mode, needed mist drops can be obtained by changing the rotating velocity of an atomizing disc. At the automatic mode, a volume median diameter (Dv50) of the mist drop which is equal to 100 micrometers is taken as a target, a relational expression between the rotating velocity of the atomizing disc and the temperature, humidity and height is obtained according to a test, the rotating velocity of the atomizing disc can be changed by considering the volatilization factor in the mist drop falling process, so that the volume median diameter of the mist drops deposited on leaves of crops can be always about 100 micrometers. The variable spraying device has the effects of water conservation and environment protection.
Owner:武同昆
Controlled quantity correction circuit used for green new energy automobile cooling cycle system
ActiveCN110119170AEffective cooling cycleChange duty cycleAuxillary controllers with auxillary heating devicesLow noiseIntegrator
The invention discloses a controlled quantity correction circuit used for a green new energy automobile cooling cycle system. A low-noise amplification circuit carries out frequency-selecting filtering on a voltage signal detected by a temperature sensor, the voltage signal is subjected to two-level low noise amplification, the load capacity of the voltage signal is improved by a follower, and then, the voltage signal enters a signal correction signal; the voltage signal is subjected to differential receiving through a differential amplifier; a differential integrator calculates a negative orpositive voltage change rate which is converted into a positive voltage change rate through an absolute value circuit; a bypass circuit is arranged to filter low voltage; a voltage signal of 0.3-+5V is converted into a square wave signal through a PWM (Pulse-Width Modulation) conversion circuit in a driving signal compensation circuit, a pulse signal is synchronized, a signal output to a trigger U1 from a controller is compensated, and a voltage signal which is higher than +5V triggers a high-voltage trigger circuit to be conducted; a controller output signal is directly compensated through atwo-time frequency multiplier in a driving signal compensation circuit to further change a controlled quantity; and therefore, the cooling cycle and the timely and effective heat dissipation of a heatdissipation pipeline can be realized.
Owner:ZHENGZHOU INST OF TECH
Fluorescent-powder-free white-light LED and fluorescent-powder-free white-light LED light-emitting module
InactiveCN104157762AAdjust spectral distributionChange duty cycleSemiconductor devicesColor rendering indexAlternating current
The invention provides a fluorescent-powder-free white-light LED and a fluorescent-powder-free white-light LED light-emitting module. The fluorescent-powder-free white-light LED comprises a substrate, a buffer layer, an n-type layer, an active layer and a p-type layer, wherein the buffer layer, the n-type layer, the active layer and the p-type layer are arranged on the substrate in sequence. The active layer comprises a long wavelength light-emitting region and a short wavelength light-emitting region. The fluorescent-powder-free white-light LED light-emitting module comprises the fluorescent-powder-free white-light LED and a driving circuit used for generating driving signals, and the driving circuit can generate the alternating-current driving signals with the frequency not lower than 200 Hz. The fluorescent-powder-free white-light LED and the fluorescent-powder-free white-light LED light-emitting module solve the problems that according to existing mainstream white-light LEDs (blue light excites yellow fluorescent powder), the fluorescent powder is short in service life, high in color temperature, low in color rendering index and the like, and the fluorescent-powder-free single-chip LED can emit white light.
Owner:TSINGHUA UNIV
LED dimming device based on PWM
InactiveCN104717778AChange duty cycleSmooth size adjustmentElectric light circuit arrangementEnergy saving control techniquesAverage currentPeak value
The embodiment of the invention discloses an LED dimming device based on PWM. The device comprises an LED driving unit, a current detecting unit and a hysteresis control unit, wherein the LED driving unit is composed of an inductor L and a fly-wheel diode, and LEDs are controlled to be turned on or off through an MOS transistor. The current detecting unit comprises a sampling resistor connected to an LED lamp in series and a differential amplifier connected to the sampling resistor in parallel; the hysteresis control unit is composed of an amplifier and a not-and gate; the negative input end of the amplifier is connected with the output end of the differential amplifier, a set threshold voltage is input to the positive input end of the amplifier, the output end of the not-and gate is connected with a gate pole of the MOS transistor, and the input of the not-and gate is connected with the output end of the amplifier and a digital dimming signal. Due to the adoption of the LED dimming device, a current hysteresis control mode is used for solving the problem that peak current and average current are not consistent during current peak control, the subharmonic oscillation phenomenon with the duty ratio larger than 0.5 occurring during peak current control is avoided, and therefore a slope compensation circuit is not needed, and the circuit structure is relatively simple.
Owner:吴汉肱
Boost chopper circuit and current-sharing control method thereof
ActiveCN105048807AChange duty cycleIncrease module capacityDc-dc conversionElectric variable regulationBoost chopperPwm controller
The present invention discloses a boost chopper circuit and a current-sharing control method thereof. The current-sharing control method is characterized in that a current-sharing current comparison circuit is utilized to receive a current-sharing signal and a current feedback signal of a BOOST main circuit to output a first error signal, then a superposed signal formed by the first error signal and a given voltage signal, and a voltage feedback signal of the BOOST main circuit are connected to a voltage comparison circuit to obtain a second error signal, so as to change the duty ratio of a driving square wave outputted by a PWM controller, an ON state and an OFF state of a power tube can be controlled through a driving circuit to achieve output tracking, thereby achieving the purposes of adjustable voltage and paralleled current sharing, solving the problems that a boost chopper circuit in the prior art has a fixed and non-adjustable output voltage and cannot achieve parallel operation, and achieving paralleled current sharing use to improve module capacity.
Owner:XJ POWER CO LTD +2
Power amplifier with online impedance monitoring function and adjusting method thereof
PendingCN113691225AGuaranteed driving abilityChange duty cycleResistance/reactance/impedenceGain controlInformation processingHemt circuits
The invention discloses a power amplifier with a online impedance monitoring function and an adjusting method thereof. The power amplifier comprises a power amplification unit and an online impedance monitoring unit, the power amplification unit comprises a power amplification controller, a driving circuit and a power amplification module which are connected in sequence, the power amplification controller is connected with an input information source, the power amplification module is connected with a load, the online impedance monitoring unit comprises an information processing module, an amplitude detection circuit, a phase preprocessing circuit and a voltage and current acquisition circuit, the input end of the voltage and current acquisition circuit is connected with the output circuit of the power amplification unit, the output end is connected with the amplitude detection circuit and the phase preprocessing circuit, the amplitude detection circuit and the phase preprocessing circuit are connected with the information processing module, and the information processing module is connected with the power amplification controller. According to the invention, the load impedance is monitored in real time through the online impedance monitoring unit, the gain of the power amplification module is adjusted, and the problem of circuit mismatching caused by the gain parameter of the power amplifier is solved.
Owner:中科长城海洋信息系统有限公司
Speed-regulated solar yacht
InactiveCN102806857AChange speedAdapt to needsSpeed controllerBatteries circuit arrangementsControl signalElectric machine
The invention discloses a speed-regulated solar yacht which comprises a solar photovoltaic panel, a charging switch circuit, a storage battery, a motor switch circuit and a direct-current series excited motor which are connected in sequence, wherein the direct-current series excited motor is used for driving screw propellers. The speed-regulated solar yacht is provided with a charging-discharging controller, a speed regulation pedal, a sensor and a speed regulation controller, wherein the charging-discharging controller is used for collecting the output voltage of the storage battery and outputting control signals to the charging switch circuit, the sensor is used for sensing the stroke of the speed regulation pedal, and the speed regulation controller is used for collecting the signals of the sensor and outputting control signals to the motor switch circuit. When the speed of the solar yacht needs to be regulated, the operator presses the speed regulation pedal so that the sensor ends voltage signals to a voltage detection circuit in the speed regulation controller, the voltage detection circuit receives and identify the voltage signals and sends the voltage signals to a pulse width modulation circuit, and the pulse width modulation circuit changes the duty ratio of the working current of the direct-current series excited motor through the motor switch circuit. Therefore, the solar yacht is changed in speed to adapt to the needs of different occasions and users.
Owner:TIANJIN JINZHONG HEAVY MACHINE & EQUIP MFG
Touch-type manicure baking lamp control circuit
ActiveCN110557867AChange duty cycleControl the size of the illuminationElectrical apparatusElectroluminescent light sourcesCooking & bakingPwm signals
The invention relates to the electronic equipment field and relates to a touch-type manicure baking lamp control circuit. According to the touch-type manicure baking lamp control circuit, a light source is a UV-ALED lamp, baking time can be adjusted, simultaneously, touch is adopted as a switching mode, 0%-100% dimming of a duty ratio is achieved, illuminance of a manicure baking lamp is controlled, and energy can be saved. The touch-type manicure baking lamp control circuit comprises a touch mode switch module, a relay driving circuit and the like. An output end of the touch mode switch module is connected with an input end of the relay driving circuit, and the touch mode switch module is used for controlling on-off of the relay driving circuit. The UV-ALED lamp is used as the light source, the baking time can be adjusted, simultaneously, a touch switch is used as a control circuit working mode, the duty ratio of PWM signals in a PWM control module is changed, the 0%-100% dimming of the duty ratio is achieved, and the illumination is controlled, and the energy can be saved.
Owner:台州丞瑞科技有限公司
Converter control method and device
InactiveCN110034676AAvoid uneven pressureChange duty cycleDc-dc conversionElectric variable regulationCapacitanceThree level
The invention relates to a control method and device for a converter, and the method comprises the steps: superposing a voltage regulation control quantity on a voltage loop output control quantity ofa three-level converter power switch as a final control quantity of the three-level converter power switch; calculating the difference between a first voltage-dividing capacitor voltage and a secondvoltage-dividing capacitor voltage of the three-level converter, and performing the adjustment through a first adjuster to obtain the voltage adjustment control quantity. The voltages of the two voltage dividing capacitors of the three-level converter are collected, and the voltage loop output control quantity of the three-level converter power switch is corrected according to the voltage difference value of the two voltage dividing capacitors, so that the duty ratio of the power switch in the three-level converter is effectively changed, and the phenomenon of non-uniform voltage of the two voltage dividing capacitors is avoided.
Owner:ZHENGZHOU YUTONG BUS CO LTD
Frequency conversion control method, frequency conversion control device and ion generator
InactiveCN107394999AChange duty cycleImprove electromagnetic compatibility characteristicsDc-dc conversionElectric variable regulationFrequency conversionElectromagnetic interference
The invention provides a frequency conversion control method, a frequency conversion control device and an ion generator. The frequency conversion control method comprises: a jitter frequency signal is generated according to a preset triangular wave pulse corresponding to a fundamental frequency; and on the basis of the frequency of the jitter frequency signal, a pulse signal is generated and the generated signal is transmitted to a silicon-controlled switch. Therefore, the electromagnetic interference of the ion generator is reduced and reliability of the ion generator is improved.
Owner:GD MIDEA AIR-CONDITIONING EQUIP CO LTD
Microfluidic sample injection system
ActiveCN110787848AReduce manufacturing costChange duty cycleLaboratory glasswaresControl cellAir pump
The invention discloses a microfluidic sample injection system, comprising a quantitative sampling module, a pneumatic and control module and a negative-pressure generator, wherein the quantitative sampling module comprises a sample pool, an inlet working channel, a first one-way valve, a first drain valve, a quantitative sampling chamber, a second drain valve, a third drain valve, a second one-way valve and an outlet working channel; the first one-way valve is arranged on the inlet working channel; the second one-way valve is arranged on the outlet working channel; the first drain valve and the second drain valve are respectively arranged at the inlet end and the outlet end of the quantitative sampling chamber; the third drain valve is arranged between the second drain valve and the second one-way valve; the pneumatic and control module comprises a miniature air pump, a miniature electromagnetic valve and a controller; the air pump is an air source for providing driving pressure; andthe electromagnetic valve and the controller form a control unit to control on-off of driving pressure. According to the system, the sample injection precision of quantitative samples can be improved,the flow rate and the flow of the samples can be controlled according to a pulse modulation principle during sample injection, and sample injection cost can be saved.
Owner:NANJING UNIV OF SCI & TECH
Method for controlling anti-lock system of four-hub-motor drive electric car free of hydraulic braking
The invention discloses a method for controlling an anti-lock system of a four-hub-motor drive electric car free of hydraulic braking, and relates to the field of automotive electronic control. In each control stage, braking force distribution of a front axle and a rear axle of a vehicle and reverse braking, regenerative braking, reverse-regenerative coordinating braking and forward driving of an in-wheel-motor are related. A logic threshold control method is adopted in ABS control, the slip rate (S) is compared with a set threshold value, the value and the direction of input voltage of the motor are controlled so that the forward driving, the reverse braking and the regenerative braking of the motor can be achieved, and accordingly wheel lock is prevented. The slip rate of a wheel is controlled near a theoretical value, the ground attachment coefficient is utilized to the maximum extent, and safe braking is achieved.
Owner:CHONGQING UNIV OF POSTS & TELECOMM
Water blowing method and water blowing device for electrophoretic coating
InactiveCN104562152BChange duty cycleRunning consistentElectrophoretic coatingsProduction lineElectrophoresis
The invention relates to a water blowing method and a water blowing device used for an electrophoretic coating production line. The invention aims at providing a method and a device which can complete water blowing operation before a coated part enters a drying oven to reduce the production cost and ensure the quality of the coated part. According to the technical scheme, an electrophoretic coating water blowing device comprises at least one water blowing mechanism, wherein each water blowing mechanism comprises a base, at least one pillar, at least one beam, a group of spraying nozzles, at least one cross sliding platform and a driving mechanism for the cross sliding platform; and the pillar is vertically fixed on the base, the beam is installed on the pillar through the cross sliding platform and arranged perpendicular to the pillar, a longitudinal sliding rail of the cross sliding platform is fixed on the pillar, a transverse sliding rail of the cross sliding platform is fixed on the beam, and the group of spraying nozzles is installed on the beam and arranged along the length direction of the beam. An electrophoretic coating water blowing method comprises the following steps: (1) air blowing: blowing off water on the surface of the coated part; and (2) air sweeping: blowing the water on the surface of the coated part completely until the coated part is dry.
Owner:ZHEJIANG UNIV OF WATER RESOURCES & ELECTRIC POWER
Frequency-adjustable oscillator capable of providing external synchronous clock function
ActiveCN113452353AAchieve regulationChange duty cycleElectric pulse generatorCapacitanceSoftware engineering
The invention discloses a frequency-adjustable oscillator capable of providing an external synchronous clock function. The circuit is a relaxation oscillator circuit which generates switching frequency for a switching power supply and achieves the purpose of PWM (Pulse-Width Modulation) adjustment. And the charging and discharging current is adjusted by arranging the off-chip resistor, so that the frequency is adjustable. In order to meet clock frequency synchronization of the same system, a synchronous external clock circuit is designed, an off-chip resistor is connected with an off-chip capacitor, and one end of the off-chip capacitor can be connected with a clock generator. After the clock generator generates a clock, the pulse is at a high level, and the voltage of the RT_SYNC pin is increased and is greater than the threshold voltage of the internal Schmitt trigger, the falling edge of the pulse triggers the D trigger and further triggers the internal RS trigger to realize frequency synchronization. And meanwhile, the duty ratio of the synchronous clock can be adjusted by changing the off-chip resistor.
Owner:SHENZHEN CYT SEMICON TECH CO LTD
Single-fire-wire multifunctional dimmer
PendingCN110611983AGuaranteed unchangedSmooth dimmingElectrical apparatusElectroluminescent light sourcesDimmerEngineering
The invention relates to a single-fire-wire multifunctional dimmer which comprises an MCU processing circuit, an alternating current input protection circuit, a single-fire-wire power-taking circuit,an LDO circuit, an automatic identification phase detection circuit, a MOS drive circuit, a MOS dimming circuit, an overload protection circuit, a synchronous signal acquisition circuit and a brightness adjustment circuit. The automatic identification phase detection circuit can detect the type of a load, thereby switching the mode which matches the load through the MCU processing circuit. The single-fire-wire multifunctional dimmer provided by the invention can keep the same overload point under different working modes.
Owner:JIANGSU ETMAN ELECTRICAL APPLIANCES +1
Vacuum blood collection tube mixing device
InactiveCN110389067ANot strenuous exerciseMeet the needs of mixing up and downPreparing sample for investigationBlood Collection TubeDrive wheel
The invention particularly relates to a vacuum blood collection tube mixing device which comprises a blood collection tube fixing bin, a transmission rod, a guide table and a uniform shaking power device; a vacuum blood collection tube is placed in the blood collection tube fixing bin, and the transmission rod makes periodic contact with the bottom of the blood collection tube fixing bin through the guide table to drive the blood collection tube fixing bin to shake up and down periodically; the uniform shaking power device comprises a motor, a disc cam and a driven wheel; when a distal hub diameter of the disc cam is in a vertical state, under the driving of the motor, the disc cam can drive the driven wheel to move upwards, so that the transmission rod moves upwards along a guide hole andfinally drives the blood collection tube fixing bin to move upwards; and when the disc cam is in other states, the transmission rod is not in contact with the bottom of the blood collection tube fixing bin, so that the vacuum blood collection tube can swing up and down periodically. The vacuum blood collection tube mixing device is similar to a manual reversing mixing effect, does not bring significant difference to blood sample detection, and can replace manual mixing works of detection personnel.
Owner:XIAN HENGCHUAN COMMERCE & TRADE
Dimming circuit and method
InactiveCN104703371AChange duty cycleTo achieve the purpose of dimmingElectrical apparatusElectric lighting sourcesControl signalAlternating current
A dimming circuit comprises a multipath input end, an alternating current-direct current conversion circuit, a voltage adjusting circuit, a direct current-alternating current conversion circuit and a control circuit, wherein the multipath input end is coupled to an alternating-current power supply and used for receiving alternating-current voltage, the alternating current-direct current conversion circuit is used for converting the alternating-current voltage into first direct-current voltage; the voltage adjusting circuit is used for converting the first direct-current voltage into second direct-current voltage, and the voltage adjusting circuit comprises a first switch; the direct current-alternating current conversion circuit is used for converting the second direct-current voltage into the working voltage of a lamp; the control circuit is coupled to the multipath input end and provides a control signal to the first switch. The dimming circuit has the advantages that the coupling modes of the multipath input end and the alternating-current power supply are converted to adjust the control signal so as to change the duty ratio of the first switch and adjust the brightness of the lamp; the dimming circuit is simple in electronic element connection, and the multipath input end is selectively coupled to the input end of the alternating-current power supply to achieve dimming.
Owner:GENERAL ELECTRIC CO
Electrophoretic coating water blowing method and water blowing device
InactiveCN104562152AChange duty cycleRunning consistentElectrophoretic coatingsSpray nozzleEnvironmental geology
The invention relates to a water blowing method and a water blowing device used for an electrophoretic coating production line. The invention aims at providing a method and a device which can complete water blowing operation before a coated part enters a drying oven to reduce the production cost and ensure the quality of the coated part. According to the technical scheme, an electrophoretic coating water blowing device comprises at least one water blowing mechanism, wherein each water blowing mechanism comprises a base, at least one pillar, at least one beam, a group of spraying nozzles, at least one cross sliding platform and a driving mechanism for the cross sliding platform; and the pillar is vertically fixed on the base, the beam is installed on the pillar through the cross sliding platform and arranged perpendicular to the pillar, a longitudinal sliding rail of the cross sliding platform is fixed on the pillar, a transverse sliding rail of the cross sliding platform is fixed on the beam, and the group of spraying nozzles is installed on the beam and arranged along the length direction of the beam. An electrophoretic coating water blowing method comprises the following steps: (1) air blowing: blowing off water on the surface of the coated part; and (2) air sweeping: blowing the water on the surface of the coated part completely until the coated part is dry.
Owner:ZHEJIANG UNIV OF WATER RESOURCES & ELECTRIC POWER
Ultrasonic cavitation bubble motion vector estimation method
PendingCN111220700AOvercome the time differenceImprove spatial resolutionUltrasound therapyAnalysing fluids using sonic/ultrasonic/infrasonic wavesUltrasonic cavitationNoise (radio)
The invention provides an ultrasonic cavitation bubble motion vector estimation method. The ultrasonic cavitation bubble motion vector estimation method comprises the steps of 1, adopting a focused ultrasonic system as a cavitation energy source to generate ultrasonic cavitation bubbles; 2, detecting the ultrasonic cavitation bubbles by transmitting the array wide beams, and acquiring to obtain the continuous sequence ultrasonic cavitation original radio frequency signals; 3, obtaining the continuous N frames of ultrasonic cavitation images by adopting a wide beam minimum variance beam formingalgorithm based on compressed sensing and an ultrasonic imaging algorithm of radio frequency data; 4, performing motion vector estimation on the ultrasonic cavitation image through a pyramid LK optical flow method to form a cavitation bubble motion vector diagram of continuous frames; and 5, changing the parameters and a medium of the focused ultrasound energy source generating cavitation, and repeating the steps 1 to 4 to obtain the cavitation and cavitation motion vector estimation images under different conditions. The invention provides a vector estimation method which is high in temporal-spatial resolution and signal-to-noise ratio and is capable of carrying out transient motion vector estimation on the ultrasonic cavitation bubbles under various conditions and realizing the ultrasonic cavitation bubble motion tracking.
Owner:ZHONGBEI UNIV
Numerical control scanning waveform generator
InactiveCN101764032ALower control costsMeet the horizontal scanning accuracy requirementsElectric discharge tubesSemiconductor/solid-state device manufacturingPhysicsWave shape
The invention discloses a numerical control scanning waveform generator, which comprises a DAC1 (digital-to-analog converter), a DAC2, a system controller, a comparator, an integrator, an amplifier, a resistor, a capacitor, a scanning speed controller, a position pulse and a scanning waveform. Compared with the conventional scanning waveform generator of an ion implanter, the invention is characterized in that the scanning cycle is a fixed constant, but within a scanning cycle, the real scanning time can be precisely adjusted by software, that is, the scanning duty ratio can be precisely adjusted. Moreover, in a beam adjusting period which has no need of scanning beam, the beam deflecting function can act on, and a beam deflection controller is saved.
Owner:BEIJING ZHONGKEXIN ELECTRONICS EQUIP
Developing device, image forming apparatus, and method for changing duty ratio
InactiveCN103376706AWon't flow throughChange duty cycleElectrographic process apparatusControl signalTransformer
A developing device includes a developing roller, a magnetic roller, a capacitor, a transformer, a switching section, a control section, a temperature detecting section, and a storage section. When changing the duty ratio of a control signal in multiple sequential steps, the control section determines the resonance period based on the temperature and temperature characteristic data and changes the duty ratio of the control signal to the next step during a changing time slot which is one of the first and second halves of a period of voltage fluctuation of the capacitor based on the determined resonance period, the one half in which the current flowing through the switching section is smaller than in the other half of the period.
Owner:KYOCERA DOCUMENT SOLUTIONS INC
Laser diode power supply structure
The invention discloses a laser diode power supply structure. The structure is simple and is easy to realize. A current mode controller is used to generate high current totem pole output, and the totem pole output of the current mode controller drives a half-bridge driver to drive high and low side MOS tubes to achieve a purpose of adjusting a laser diode current. The current mode controller, thehalf-bridge driver, and the MOS tube are easy to purchase and cost is low. A high-side MOS tube and a low-side MOS tube are alternately conducted so that an energy storage inductor side forms an alternating voltage with an amplitude of Ui / 2. A duty cycle of a switch is changed so that an average value of an output voltage u can be changed and an output voltage Uo is also changed, and adjusting isconvenient.
Owner:UNION OPTECH
A microfluidic sampling system
ActiveCN110787848BSimple structureImprove sampling accuracyLaboratory glasswaresSolenoid valveControl cell
Owner:NANJING UNIV OF SCI & TECH
Battery discharge circuit, power supply and LED lamp
InactiveCN101710782BAdjust duty cycleChange duty cycleApparatus without intermediate ac conversionElectric light circuit arrangementDriving currentElectrical resistance and conductance
The invention is applicable to the field of power supplies, in particular to a battery discharge circuit, a power supply and an LED lamp, the circuit comprises a constant-current drive control chip, an adjustable width pulse circuit and a battery discharge passage, wherein the constant-current drive control chip is used for outputting constant-current drive current; the adjustable width pulse circuit is series-connected between a positive end of a battery and a pin of the power supply of the constant-current drive control chip and used for changing the resistance of a charge-discharge resistor, outputting the adjustable width pulse and regulating the high-level duty cycle; and the battery discharge passage is series-connected between the positive end of the battery and a drive pin of the constant-current drive control chip and used for receiving the drive current outputted by the constant-current drive control chip. An oscillation working circuit in the battery discharge circuit is designed to the adjustable width pulse circuit, and the discharge time of the battery is prolonged by changing circuit parameters and adjusting the pulse width.
Owner:OCEANS KING LIGHTING SCI&TECH CO LTD +1
Quantum dot-based manufacturing method for simulating solar spectrum wled and smart light bulb
ActiveCN110718618BSymmetrical emission spectrumGood fluorescence stabilityMaterial nanotechnologyNanoopticsEpoxyQuantum yield
The invention relates to the technical field of bright lighting, in particular to a solar spectrum simulation WLED manufacturing method based on a quantum dot, and the method comprises the following steps: (A) synthesizing CdSe / ZnS core-shell quantum dot solvents in various sizes; (B) synthesizing CdSe / CdS core-shell quantum dot solvents in various sizes; (C) mixing the various solvents obtained at the steps A and B, mixing the mixture solvents with epoxy resin, and performing uniform stirring; (D) dropwise adding the mixture obtained at the step C onto the surface of a GaN chip, and performing heating in a vacuum oven to obtain a WLED. The invention further discloses a smart lamp bulb made of the WLED. Due to the quantum confinement effect of the quantum dots, the CdSe core-shell quantumdots have many advantages compared with traditional fluorescent materials, such as symmetrical emission spectrum, strong fluorescence stability, narrow full width at half maximum and high fluorescencequantum yield; by changing the size and chemical composition of the semiconductor quantum dots, the fluorescence emission wavelength can cover the whole visible region, and the method is very practical.
Owner:JILIN UNIV
High-voltage switch and control method thereof
InactiveCN108400051AMeet the requirements of mechanical characteristics differentiationRealize differentiated customizationSwitch power arrangementsAir-break switch detailsMagnetic tension forceEnd stages
The invention relates to a high-voltage switch and a control method thereof. The method comprises the following steps of: dividing a tripping stroke and / or a closing stroke of a high-voltage switch into at least two sections; setting a direction of a force applied by the winding to control the high-voltage switch to perform a tripping or closing action; and setting the windings of different sizesin each interval to control the speed of the different high-voltage switches to perform the opening and closing operations, wherein the force subjected by the windings in the interval in the initial stage of the opening stroke or the closing stroke is greater than the force subjected by the windings in the interval in the ending stage. The invention adjusts different parameters for different voltage grade products, that is, according to the requirements, the direction and size of the different windings are set in each interval, so that different magnetic mechanisms are not needed for the mechanical characteristics of the high voltage switches of different voltage levels, thereby meeting the requirements of different mechanical characteristics of different voltage grades, and realizing thedifferential customization of different high voltage switches.
Owner:PINGGAO GRP +2
Automobile instrument self-adaptive backlight control system and method
PendingCN113851088AExtended service lifeAvoid HuapingStatic indicating devicesDashboard lighting devicesEmbedded systemDriving safety
The invention relates to the technical field of automobile instrument panel control, in particular to an automobile instrument self-adaptive backlight control system and method. The control system comprises an automobile body controller which is in communication connection with an automobile instrument system, wherein the automobile instrument system comprises a first single-chip microcomputer, and a configuration module and a display screen which are in communication connection with the first single-chip microcomputer; and the automobile body controller comprises a second single-chip microcomputer, and an illumination sensor in communication connection with the second single-chip microcomputer. The automobile instrument self-adaptive backlight control system and method solve the problems that the existing instrument panel backlight control adopts a setting menu and a small lamp signal for adjustment, but the mode is relatively poor in self-adaptive dimming effect and driving experience, and the driving safety is influenced since the existing backlight display technology is easy to cause a blurred screen fault when exposed under the high-temperature environment .
Owner:HUIZHOU DESAY SV AUTOMOTIVE
Circuit structure for realizing stepless dimming function
PendingCN112822818AExtended off timeRealize stepless dimming schemeElectrical apparatusEnergy saving control techniquesCapacitanceControl signal
The invention relates to a circuit structure for realizing a stepless dimming function, and the circuit structure comprises: a first current generation circuit module which is used for achieving the continuous linear change output of a first current; a second current generation circuit module which is used for realizing continuous linear change output of second current; a first switch module which is used for controlling the charging and discharging time of the capacitor; a second switch module which is used for controlling the charging and discharging time of the capacitor; a frequency modulation module which is used for performing frequency modulation on the first current and the second current; and a LED driving module which is used for dimming the LED light source. By the adoption of the circuit structure for achieving the stepless dimming function, a dimming circuit based on a PFM mode and an implementation mode are provided, the working frequency of the circuit is modulated, the switch-off time of a switch tube is increased to change the duty ratio of the switch-on time of the switch tube, and finally LED dimming is achieved; and the LED output current can change linearly along with the dimming control signal, and a stepless dimming scheme can be realized.
Owner:CRM ICBG (WUXI) CO LTD
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