65results about How to "Realize dimming function" patented technology

The invention relates to an LED dimming control circuit, which comprises a pulse width modulation control circuit (100) and a constant current control circuit (200). The pulse width modulation control circuit (100) comprises a trigger and a potentiometer; and the size of the pulse width generated by the trigger is adjusted by adjusting the potentiometer. The constant current control circuit (200) comprises a field effect transistor and an operational amplifier; and the pulse width generated by the trigger controls the on/off time of the field effect transistor, and controls the potential of reference voltage of the operational amplifier according to the on/off time of the field effect transistor so as to adjust the magnitude of constant current. In the LED dimming control circuit, the size of the pulse width generated by the trigger can be adjusted by adjusting the potentiometer manually, and the potential of the reference voltage of the operational amplifier is changed by setting the on/off time of the field effect transistor according to the size of the pulse width so as to adjust the magnitude of the constant current; therefore, the dimming function is realized.

The invention provides an intelligent dimming module and an intelligent dimming LED lamp and a control method thereof, and relates to the field of LED electronic circuits. The intelligent dimming module comprises a power supply conversion module, a Zigbee control module, a PWM control module and an intelligent dimming module. The power supply conversion module is connected with a power supply, and is connected with the Zigbee control module and the PWM control module; the intelligent dimming module is connected with the Zigbee control module, the Zigbee control module is connected with the PWM control module, the PWM control module is connected with an LED lamp, the intelligent dimming module receives an input signal of a user and outputs a corresponding control signal, and the control signal is transmitted to the PWM control module through the Zigbee control module and is used for controlling working of the LED lamp. The brightness of the LED lamp is adjusted optionally in all-color range; and the intelligent dimming LED lamp is matched with an intelligent household system and can be applied to various scenes.

The invention discloses a light adjusting system for an LED (Light Emitting Diode) lighting fixture. The light adjusting system comprises an LED lighting fixture, a control module and a traditional switch, wherein the LED lighting fixture is electrically connected inside a main circuit, the control module is arranged on the LED lighting fixture, the traditional switch is used for controlling the make-and-break of a circuit of the LED lighting fixture connected inside the main circuit; the LED lighting fixture comprises a driving power source and an LED light source, wherein the driving power source is electrically connected inside the main circuit, and the LED light source is electrically connected on the driving power source and is driven by the driving power source; a field-effect tube is arranged between the control module and the LED lighting fixture; a G pole of the field-effect tube is electrically connected with the control module; a D pole of the field-effect tube is electrically connected with the driving power source; and a S pole of the field-effect tube is electrically connected with the LED light source. The control module integrating multiple control modes is adopted in the light adjusting system and is matched with the low-loss field-effect tube to realize the light adjustment function of the LED lighting fixture; and the light adjusting system is independent of a light adjusting interface provided or not provided by the driving power source of the LED lighting fixture, is suitable for the most of LED lighting fixtures, has concise structure and high generality and is low in cost.

The invention discloses a non-isolated LED dimming circuit with PWM and DIM dimming, relating to the technical field of LED dimming. The circuit comprises an LED lighting circuit and a dimming circuit. The dimming circuit comprises a high voltage to low voltage module, a demagnetization time detection module, a switch control module, a peak detection module and a dimming signal input end. The demagnetization time detection module adjusts the closing time of a high voltage MOS tube according to an input direct current signal, thus a demagnetization time is adjusted. The peak detection module adjusts the peak of inductance discharge in the LED dimming circuit. The switch control module controls the gate of the high voltage MOS tube according to an input PWM signal, the output signal of the demagnetization time detection module and the signal of the peak detection module, thus the current of an LED lamp is adjusted, 5V voltage is outputted, power can be supplied to the MCU and Bluetooth module of a control system and a radar module, an additional power supply is not needed, the chip isolation is high, and two ways of control can be applied independently without affecting each other.

The invention discloses a voltage induction type dimming control system and a voltage induction type dimming control method thereof. The voltage induction type dimming control system comprises a power supply circuit, wherein the power supply circuit comprises a power supply converter, an output current sensor, an input voltage sensor, and a feedback control circuit; the power supply converter is used for driving an illuminating device by a power supply; the output current sensor is used for sending the output current of the power supply converter to generate a sensing output current; the input voltage sensor is connected to the input end of the power supply converter and is used for sensing an input voltage of the power supply converter to generate a sensing input voltage; and the feedback control circuit is used for outputting a dimming control signal to control the switch handover of the power supply converter so as to regulate the output current of the power supply converter. According to the voltage induction type dimming control system, when the input alternating current voltage of a power supplier of a light emitting diode illuminating device changes within different voltage ranges, the power supplier of the light emitting diode illuminating device outputs different constant voltages or constant currents to the light emitting diode illuminating device so as to control the brightness of the light emitting diode illuminating device to achieve the function of regulating the brightness of the light emitting diode illuminating device.

The invention discloses a control circuit compatible with a 0-10V light modulator and a TRAIC light modulator. The control circuit comprises a singlechip microcomputer, the TRAIC dimming circuit, a TRAIC signal generation circuit, an external voltage detection circuit and a PWM control silicon-controlled circuit, wherein the PWM control silicon-controlled circuit comprises a photoelectric couplerand a bidirectional silicon controller, the external voltage detection circuit is used for detecting an interface voltage, and the singlechip microcomputer is used for receiving and judging whether the TRAIC light modulator or the 0-10V light modulator is connected or not; when the TRAIC light modulator is connected, the bidirectional silicon controller is controlled to be conducted by the singlechip microcomputer, and a control signal of the TRAIC dimmer enters the TRAIC dimming circuit to achieve light modulation by the bidirectional silicon controller; and when the 0-10V light modulator isconnected, the singlechip microcomputer is used for converting the received voltage signal to a PWM signal output to control the bidirectional silicon controller to be conducted, a TRAIC signal is generated by the TRAIC signal generation circuit and is input to the TRAIC dimming circuit, so that light modulation is achieved.

The invention discloses a secondary side control isolation dimming circuit built by an operational amplifier. The secondary side control isolation dimming circuit comprises a power input end, a high-power control circuit and a power output end which are sequentially connected, wherein a dimming signal conversion circuit and a secondary side control circuit are connected between the high-power control circuit and the power output end; the dimming signal conversion circuit and the secondary side control circuit perform signal transmission through a first optical coupler; and the high-power control circuit and the secondary side control circuit perform signal transmission through a second optical coupler. The secondary side control isolation dimming circuit realizes the dimming function of input and output isolation and dimming signal and output isolation.

The invention relates to a control device of a light-control LED automobile headlamp. The control device comprises a voltage stabilization circuit, a pulse signal circuit and a constant-current driving circuit, wherein an input end of the voltage stabilization circuit is connected with a DC voltage source, an output end of the voltage stabilization circuit is connected with an input end of the pulse signal generation circuit, an output end of the pulse signal generation circuit is connected with an input end of the constant-current driving circuit, and an output end of the constant-current driving circuit is connected with the automobile headlamp. By the device, the luminous intensity of the automobile headlamp is controlled to be automatically adjusted with ambient illumination intensity, and an energy source is favorably saved. The device can also be applied to other lighting occasions such as road/plaza lighting if the device is changed slightly, and has a wide application prospect.

The invention relates to an LED lighting driver. The LED lighting driver comprises: a plurality of LED lamps connected in series; a sampling circuit connected with the LED lamps in parallel; a power switch tube connected with the LED lamps and the sampling circuit; a voltage and current sampler connected with the sampling circuit; an illuminance adjusting potentiometer connected with the voltage and current sampler; a PWM chip connected with the power switch tube, the voltage and current sampler and the illuminance adjusting potentiometer, wherein the PWM chip controls the power switch tube toadjust according to the difference value of the voltage and current values fed back by the voltage and current sampler and the voltage and the current input required by adjusting the brightness of the LED lamps actually by the illuminance adjusting potentiometer. The LED lighting driver can achieve the dimming function of the lighting lamp in the manned spacecraft from zero illumination, and thedefect that the minimum illumination of the lighting lamp cannot be adjusted to zero is overcome.

The invention relates to a stroboflash-free sectional type constant-current LED driving circuit. The stroboflash-free sectional type constant-current LED driving circuit comprises an LC low-pass filtering circuit, a rectification filtering circuit, a bridge inversion circuit, an LC resonance filtering circuit and a sectional type constant-current LED driving circuit. The sectional type constant-current LED driving circuit is enabled to have quite high versatility and adaptability, and the application scope of a sectional type driving scheme in the field of LED illumination is expanded.

The invention discloses a wall-mounted artificial intelligence online education terminal. The wall-mounted artificial intelligence online education terminal comprises a limiting frame, a single chip microcomputer, a display screen, a main framework and heat dissipation fans, wherein the two heat dissipation fans are embedded on one side of the inside of the main framework, a mounting groove is arranged in the other side of the inside of the main framework, LED light-supplementing lamps distributed at equal intervals are mounted on the inner side wall of the mounting groove, a display screen isfixed inside the position, on one side of the LED light-supplementing lamps, of the mounting groove, the limiting frame is mounted at the position, on the outer side of the display screen, of the edge of the main framework, a wireless receiver is embedded on one side of the bottom of the limiting frame, a voice player is fixed to the other side of the bottom of the limiting frame, a high-definition camera is mounted at the central position of the top of the limiting frame, and illumination sensors are fixed at the positions, on two sides of the high-definition camera, of the tops of the limiting frame. With the wall-mounted artificial intelligence online education terminal, the work environment of the online education terminal is improved, the teaching effect of the online education terminal is improved, and meanwhile, the accidental falling of the online education terminal is avoided.

The invention discloses a sectional type LED dimming lamp without an externally arranged dimmer and a dimming method of the sectional type LED dimming lamp without the externally arranged dimmer. The sectional type LED dimming lamp without the externally arranged dimmer comprises a bulb structure. A dimming circuit is arranged and fixed in the bulb structure. The dimming circuit comprises a rectifier bridge electrically connected with alternating current in a city through a power source switch and an LED lamp control output circuit connected with the rectifier bridge in a direct current outputting mode. The LED lamp control output circuit comprises a high-frequency transformer composed of a primary coil, a secondary coil and a magnetic core, a pulse generator used for driving the primary coil to vibrate and a sectional dimming control circuit. The primary coil supplies power for driving an LED tube to emit light. The second coil supplies direct current for the pulse generator with pulse width adjustable and the sectional dimming control circuit through a rectifying circuit. The sectional type LED dimming lamp is simple in structure, small in the number of high-frequency transformer windings, capable of the achieving dimming function of the lamp, free of adding the dimmer and capable of completely achieving the technology of dimming through a switch, reducing cost and increasing reliability of the circuit.

The invention discloses an LED driving power supply based on 2.4 G remote control light modulation and color modulation. The power supply comprises: an LED driving circuit which is connected between the input end of an AC power supply and an LED light source, wherein the LED light source comprises at least two groups of LED lamp strings which are connected in parallel and have different color temperatures; a dimming circuit connected with the LED driving circuit and used for adjusting a current input to the LED light source by the LED driving circuit according to the input PWM signal; a colormodulation circuit connected to the loops of the LED driving circuit and the LED light source and used for adjusting a current input to each LED lamp string according to the input PWM signal; and a master control circuit integrally with a 2.4G wireless transceiver module and connected with a light modulator with 0-10V, wherein the master control circuit outputs PWM signals to the light modulationcircuit and/or the color modulation circuit respectively according to the light modulation and/or color modulation signals from the 2.4G wireless transceiver module or the light modulation signals from the 0-10V light modulator so as to control the light modulation circuit and/or the color modulation circuit to work.

The method comprises: presetting a current value for the high intensity gas discharge lamp; detecting the output current from AC/DC converter; comparing the converted variable current with the preset current value to generate a control signal for the AC/DC converter; generating a driving signal to switch tube, and controlling its input current to equal to the preset value.

The invention discloses a light modulation circuit of an electromagnetic induction lamp which comprises a closed-loop light modulation control signal device, a lamp power feedback compensation device, a resistance-capacitance oscillation timer, a lamp current sampling signalizer and a lamp voltage sampling signalizer. The invention can realize the operation status monitoring and real time adjustment.

The invention discloses an LED driving power supply circuit, which comprises a light modulation unit, a control unit, a communication unit and a power supply unit, wherein the light modulation unit isused for receiving a first light modulation signal sent by a light modulator and filtering the first light modulation signal; the control unit is connected with the light modulation unit, and is usedfor outputting a second light modulation signal to power supply voltage for light modulation according to the first light modulation signal and communicating with a CD-R machine to output a corresponding feedback signal according to a burning signal sent by the CD-R machine; the communication unit is connected with the control unit, and is used for feeding back the feedback signal output by the control unit to the CD-R machine; the power supply unit is connected with the control unit, and is used for supplying power to the control unit; and the light modulation unit, the control unit, the power supply unit and the communication unit are all connected to a multiplex interface for connection of the light modulator or the CD-R machine. The number of interfaces and the number of connection wires can be reduced; the cost can be reduced; and the structural design can be optimized.

The invention provides an LED single-segment constant-current light-modulation drive circuit and method, and the circuit is connected to an LED light source drive circuit. The circuit adjusts the current of an LED source through closed-loop control, and achieves the constant-current light modulation of the LED light source. The circuit specifically comprises a current detection module which compares a supply voltage of the circuit with an adjustable voltage, obtains an error signal, and outputs the difference between an error signal and a reference voltage, wherein the difference serves as a control voltage; and a power adjustment module which is connected with the negative electrode of the LED light source and the current detection module, collects the sampling voltage of the LED light source, compares the sampling voltage and the control voltage, outputs a constant-current control signal, controls the amplitude of the current passing through the LED light source, and controls the current to be a constant current when the adjustable voltage is constant. The circuit achieves a light modulation function of a single-segment LED light source under the condition of guaranteeing the constant drive of the single-segment LED light source, is small in size, is stable in use, is low in cost, and greatly improves the LED performances.

The invention discloses a digital universal light modulator which integrates an electromagnetic radiation suppression circuit, a rectifying circuit, a switch circuit, a low-power-consumption current amplification circuit and acceleration loop, a power supply circuit, a single-core or multiple-core microcontroller, a zero potential detecting circuit, a front/rear shifting switch, an upper/lower regulation ON/OFF digital coding incrementer. The digital universal light modulator can change dimming/speed-regulation into front shifting or rear shifting waveforms according to different loads so as to achieve the purpose that any load is accessible, and the loads include loads of a halogen lamp, an electronic transformer, a CFL lamp tube stabilizer, a front shifting LED lamp, a rear shifting LED lamp, a fan speed regulator and the like different in capacitive character, inductive character and resistive character.

The invention relates to the technical field of headlamp dimming, in particular to a distance light and short-distance light linked dimming mechanism. The distance light and short-distance light linked dimming mechanism comprises a short-distance light bracket and a short-distance light bracket, wherein one side of the short-distance light bracket is in rotary fit to a first dimming screw, one side of the distance light bracket is in rotary fit to a second dimming screw, the short-distance light bracket and the distance light bracket are connected through a linking rod, the linking rod is perpendicular to the short-distance light bracket and the distance light bracket simultaneously, the short-distance light bracket is perpendicularly connected to a telescopic rod of a dimming motor, the dimming motor can drive the short-distance light bracket to rotate around the side of the first dimming screw and drive the distance light bracket to rotate around the side of the second dimming screwsimultaneously, and the rotating radiuses, directions and angles are same; after the dimming motor receives a signal, the telescopic rod of the dimming motor stretches out or retracts, so as to drivethe short-distance light bracket and the distance light bracket to rotate, so that the dimming function is achieved effectively. The whole structure is relatively compact, and the linking rod is shortened, so that the space range of the whole mechanism is reduced effectively, and miniaturization of a headlamp is promoted.

The invention is applicable to the technical field of LED lighting, and provides a light control system, which is characterized in that the first input end of an internal control module and the firstinput end of a switching power supply control module are connected with an external control switch and then connected with a power supply, the second input end of the internal control module is connected with an external signal input module, the first output end of the internal control module is connected with the second input end of the switching power supply control module, the second output endof the internal control module is connected with the second input end of a conversion module, the third output end of the internal control module is connected with the first output end of the conversion module, the first output end of the switching power supply control module is connected with the first input end of the conversion module, the first output end of the conversion module is connectedwith the positive electrode end of a LED lamp set module, and the second output end to the Nth output end of the conversion module are connected with the negative electrode ends of all LED lamps in the LED lamp set module respectively, so that continuous dimming and free color modulation of the LED lamp set module are achieved through different controls.

The invention discloses a high-voltage and large-power PWM light modulation LED driving power supply without an electrolytic capacitor. The LED driving power supply comprises a rectification circuit (1). The rectification circuit (1) is connected to the input end of the power supply. The LED driving power supply also comprises a current type multi-level DC-DC circuit and a control circuit. The rectification circuit (1) is connected to the current type multi-level DC-DC circuit. The current type multi-level DC-DC circuit is connected to an LED light source (5), and is also connected to the control circuit (4). An electrolytic capacitor is not needed by the LED driving power supply, so the service life of the driving power supply is prolonged and the reliability of a whole LED illumination system is improved.

The invention discloses a full-spectrum lamp bead LED chip and a full-spectrum low-UGR low-blue-light lamp. The chip comprises a silicon carbide substrate, wherein the silicon carbide substrate is provided with more than two light-emitting chip areas of a continuous forbidden band, the light-emitting materials of different light-emitting chip areas are InGaN ternary materials, and by adjusting the proportion of In: Ga in the InGaN ternary materials, light-emitting chip areas with different wave bands from infrared to ultraviolet can be manufactured. The lamp comprises a shell, wherein a plurality of upper lamp panels are attached to the outer side of the top surface of the shell, main light-emitting lamp beads and light supplementing lamp beads are alternately attached to the upper side surfaces of the upper lamp panels, and the light emitting directions of the main light-emitting lamp beads and the light supplementing lamp beads are both vertically upward; a plurality of lower lamp panels are attached to the inner side of the top surface of the shell, and main light-emitting lamp beads and light supplementing lamp beads are alternately attached to the lower lamp panels; and a chip of the main light-emitting lamp bead is a full-spectrum lamp bead LED chip. According to the scheme, the spectrum is close to the full spectrum of sunlight, the UGR effect is achieved, and the lamp is suitable for indoor environment illumination.

The invention discloses adjustable liquid crystal polarizing film and a preparing method thereof. The adjustable liquid crystal polarizing film comprises first cholesteric liquid crystal thin film, afirst substrate layer, a liquid crystal layer, a second substrate layer and second cholesteric liquid crystal thin film; the first substrate layer comprises a first transparent substrate and a first transparent conduction layer which is located at the side, facing the liquid crystal layer, of the first transparent substrate; the second substrate layer comprises a second transparent substrate and asecond transparent conduction layer which is located at the side, facing the liquid crystal layer, of the second transparent substrate; the first cholesteric liquid crystal thin film and the second cholesteric liquid crystal thin film are both multilayer cholesteric liquid crystal thin film. By means of the adjustable liquid crystal polarizing film and the preparing method thereof, the light transmission effect of the adjustable liquid crystal polarizing film can be improved.