366results about "Semiconductor lamp usage" patented technology

The present invention relates to a protection circuit for protecting a load, the protection circuit comprising: an input node adapted to be couplable to an SMPS, a bleeder coupled between the input node and a return node, a first output node adapted to be coupled to the input node and a load, a second output node adapted to be coupled to the load, the second output node being couplable between the first output node and the second output node, an impedance coupled between the second output node and the return node, a switch coupled in parallel with the impedance, and a controller adapted to control the switch and the bleeder, the controller adapted to activate the bleeder and open the switch when a voltage across the impedance is above a threshold, and the controller adapted to deactivate the bleeder and close the switch when a voltage across the impedance is below the threshold.

The application provides a synergic dynamic lighting method and its adjustable light direct current incandescent lamp, relates to the field of vision and lighting, and aims to ensure that light is uniform and dynamic in the field of vision; the color temperature is strictly imitated candlelight; the core is direct current adjustable light incandescent lamp technology; and the light in the field of vision is mostly non-uniform and static in the present night desktop lighting, and the light quality is never as good as direct current incandescent lamp; this easily leads to eye accommodation laxity and induces axial myopia; the application mainly comprises two direct current incandescent lamp platforms, one of which illuminates a book, and the other of which illuminates a white wall in front of the eyes; the light intensity of each is adjustable to ensure the uniformity of light in the field of vision, so that the fovea and peripheral rod cells of the retina are stimulated at the same time; the two lamps can also realize the synchronous adjustment of illumination according to the program, thereby guiding the dynamic focusing of the eyes and realizing dynamic lighting; the dynamic also reflects the low color temperature mammal lighting imitating candlelight according to the biological clock and the anti-alzheimer's lighting with 40Hz deep frequency flash.

The invention discloses a dual-optical-path keyboard with a silica gel elastic piece capable of shielding light. The dual-optical-path keyboard comprises the silica gel elastic piece and an FPC, and a plurality of chips are arranged on the FPC. And the chip is one of a full color control chip, a full load color control chip, a confluence color control chip, a load color control chip and a fantasy color control chip. The light-sensitive element is located under the silica gel elastic piece, the silica gel elastic piece is made of a light-transmitting color material and a light-shading color material, the GRB in the chip is an emission light source, one path of the GRB directly provides illumination for a key cap character, the other path of the GRB directly penetrates through the silica gel elastic piece to provide the emission light source for the light-sensitive element under the silica gel elastic piece, and one light source has two purposes. The invention provides the optical switch keyboard with serial-parallel hot standby, the communication circuit is simple, the reliability is high, a single single-sided FPC (Flexible Printed Circuit) can realize full-key no-impact and GRB indication, a keyboard MCU (Microprogrammed Control Unit) can communicate with the keyboard through a maximum 5PIN electrical network, and the optical switch keyboard can be widely applied to notebook computer production.

The invention provides a self-adaptive ripple suppression circuit based on an MOSFET, and relates to the technical field of electronic circuits. The circuit comprises an input alternating current end EMC filtering surge protection circuit, a rectification circuit, an absorption protection filtering circuit, a clamping absorption circuit, a detection protection circuit, a control circuit, a power follow current circuit, an output filtering circuit, a stroboflash removing circuit and an LED load circuit which are connected in sequence. Under the condition that the MOSFET self-adaptive ripple suppression circuit is in a working state, voltage at the two ends of the sampling resistor is fed back to a grid electrode and a source electrode of the MOS tube, on-resistance of the MOS tube is adjusted through change of the sampling voltage on the basis of the characteristic that the MOS tube works in a variable resistance area, and output current ripples are dynamically suppressed. The circuit has excellent adaptive capacity, can dynamically suppress output current ripples in a wide load range through a simple simulation negative feedback loop, and is quick in response.

A portable lighting device control module configured to intuitively adjust lighting operations of a portable lighting device by interpreting real-time user gestures and external conditions of the portable lighting device to modify lighting operations in response thereto. The control module installed within a portable lighting device may be configured to permit automatic dimming of front-end LEDs, enable a low power standby mode in absence of motion being detected, automatic mode adjustments in response to low battery determination, adjustment to lantern mode when a bump gesture is detected, continuous alternation between modes within lantern mode by detecting subsequent bump gestures, exiting lantern mode by detecting orientation, locking the lighting operation to a specific mode by determining orienting as either upwards or downwards, switching between modes by performing twist and return gestures, switching between modes by performing whip gestures, instantaneously dimming the light intensity by twisting the portable lighting device.

An LED lamp arrangement (100) for replacing a fluorescent lamp in a luminaire having an electronic ballast. The LED lamp arrangement (100) has a plurality of LEDs (101, 102, 103), an SVM reduction circuit (110) having an energy storage device connected across the plurality of LEDs (101, 102, 103), and a measurement and control circuit (120) adapted to measure the current drawn from the electronic ballast and generate an output to the SVM reduction circuit (110). Based on said output, the measurement and control circuit (130) is configured to activate the SVM reduction circuit (110) when the current drawn from the electronic ballast exceeds a threshold, and deactivate the SVM reduction circuit (110) when the current drawn from the electronic ballast does not exceed the threshold.

System and method for controlling one or more light emitting diodes. For example, the system includes: a power supply controller configured to receive a cathode voltage from a cathode of a diode, the diode including an anode configured to receive a rectified voltage generated by a rectifying bridge, the power supply controller being further configured to generate a first signal based at least in part on the cathode voltage; and a driver configured to receive the first signal and generate a second signal based at least in part on the first signal, the driver being further configured to output the second signal to a gate terminal of a transistor, the transistor including a source terminal coupled to the driver and a first resistor, the transistor further including a drain terminal coupled to the one or more light emitting diodes and an output capacitor connected to the cathode of the diode.

The utility model, which relates to the technical field of the LED, discloses a leakage protection circuit comprising a power supply circuit, a step-down circuit, an LED circuit and a detection circuit. The input end of the power supply circuit is connected to the output pin of the power supply end, the output end of the power supply circuit is connected with the input end of the step-down circuit and the input end of the LED circuit, and the power supply circuit is used for rectifying the output power supply of the power supply end so as to output the power supply to the step-down circuit and the LED circuit; the output end of the step-down circuit is connected with the detection circuit, and the step-down circuit is used for carrying out step-down processing on the power supply output by the power circuit to output reference voltage to the detection circuit; and the detection circuit is respectively connected with the output pins of the power supply end and the LED circuit, and is used for controlling the working state of the LED circuit according to the real-time voltage difference and the real-time voltage between the output pins of the power supply end and the reference voltage output by the step-down circuit. According to the utility model, the working state of the LED circuit can be controlled according to the real-time voltage difference, the real-time voltage and the reference voltage, thereby realizing anti-creeping protection.

An LED driver configured to control a LED fixture comprising a plurality of LED groups is described, each LED group comprising at least one LED forming a series connection with a switch, wherein the plurality of LED groups are arranged in a parallel connection, the LED fixture further comprising a capacitor arranged in a parallel connection to the plurality of LED groups, the LED driver comprising:a power converter for converting an input power from a power source to a current which is provided to the plurality of LED groups;a control unit configured to control the power converter to provide the current to the plurality of LED groups, and wherein the control unit is further configured tocontrol an operation mode of the switch of the LED group between a nominal mode, wherein the switch operates in a closed nominal state or an open nominal state, anda transition mode, wherein the switch operates in a semi-closed state, wherein a gate to source voltage of the switch of the LED group is lower than the gate to source voltage of the respective switch when operated in the nominal mode,switch the current from flowing through a first LED group to flowing through a second LED group, wherein the first LED group has a higher forward voltage than the second LED group, by switching the switch of the first LED group in the open nominal state and the switch of the second LED group in the semi-closed state during a transient period.

The application relates to an intelligent control system of a light source, which comprises a main controller, a control circuit, a sensing module, a first power supply circuit, a second power supply circuit and a networking module; the sensing module comprises a three-axis sensor, an ambient light acquisition circuit, a current acquisition circuit and a voltage acquisition circuit, all of which are connected with the main controller, and the acquisition ends of the current acquisition circuit and the voltage acquisition circuit are connected to the first power supply circuit; the working state of an indicator board is judged by setting the sensing module to acquire the posture, ambient light, voltage and current of the indicator board during work, and the controller is used for judgment; when the working posture, ambient light, working voltage or working current of the indicator board is abnormal, the controller can automatically select circuit breaking protection by the control circuit or remotely send information to inform relevant staff to overhaul according to the severity, so that relevant personnel can timely find and solve faults.

A bidirectional colorful light triggered by power-line pulse signals connected in series and parallel includes a bidirectional luminous light string triggered by power-line pulse signals, a first controllable switch, a second controllable switch, a third controllable switch, and a fourth controllable switch. The bidirectional luminous light string triggered by power-line pulse signals comprises a plurality of bidirectional light sources, which comprises a light module triggered by power-line pulse signals and a reverse light module. The light module triggered by power-line pulse signals comprises an LED colorful light group and an LED driver that drives the LED colorful light group based on power-line pulse signals loaded on power lines of the bidirectional luminous light string triggered by power-line pulse signals. This invention achieves a bidirectional colorful light driven by power-line pulse signals through the control of the second and fourth controllable switches, simplifying the control circuit.

An apparatus for retrofitting a HID lighting system includes using existing components of previously installed HID lighting systems such as its ballasts while replacing some capacitors to adjust the power supplied to a retrofit LED luminaire. Unused ballast drivers are removed, and a self-contained ballast driver assembly is mounted into the electronic control enclosure of the previously installed lighting system. Some of the retrofit LED luminaires include an uplighting lens, an optic, or a diffuser for providing uplight. An aiming bracket and an aiming plate allow for the horizontal aiming angle of a light luminaire to be set.

An apparatus for retrofitting a HID lighting system includes using existing components of previously installed HID lighting systems such as its ballasts while replacing some capacitors to adjust the power supplied to a retrofit LED luminaire. Unused ballast drivers are removed, and a self-contained ballast driver assembly is mounted into the electronic control enclosure of the previously installed lighting system. Some of the retrofit LED luminaires include an uplighting lens, an optic, or a diffuser for providing uplight. An aiming bracket and an aiming plate allow for the horizontal aiming angle of a light luminaire to be set.

The utility model relates to OLED backlight source technical field especially relates to a kind of ultra-thin OLED backlight source device. Its technical scheme includes rear shell, front shell, OLED backlight source module, drive shaft, driven shaft and mounting shaft, the inside fixed plate is placed in the rear shell upper end, the OLED backlight source module is set on the fixed plate upper end, the front shell is set on the rear shell upper side, the drive shaft and three groups of driven shaft are set in the rear shell inside, the mounting shaft is set in the rear shell side, the screw is set on the mounting shaft upper end, the threaded sleeve is set in the front shell lower end, the ball bearing one rotatingly installed with mounting shaft is embedded and installed in the inside four corners of the fixed plate, the drive shaft one end is provided with torsion block, the through-hole corresponding torsion block is clamped in the inside of the rear shell one end. The utility model is through linkage structure, only through rotating torsion block shell drives multiple screws to be fixed in front shell back, avoid the separate disassembly of multiple fixed parts, so that OLED backlight source module maintenance disassembly is time-saving and convenient.

The utility model particularly relates to an active LED afterglow removing circuit, which comprises a VIN end, a grounding end GND, a light emitting diode LED1, a first field effect transistor Q1, a second field effect transistor Q2 and an ON / OFF control end, and is characterized in that the VIN end is connected to one end of a third resistor R3; the cathode of the LED 1 is connected with the pin 3 of the second field effect transistor Q2; a pin 1 of the second field effect transistor Q2 is connected to a pin 2 of the first field effect transistor Q1; a pin 3 of the first field effect transistor Q1 is connected with a grounding end GND; the first pin of the first field effect transistor Q1 is connected with an ON / OFF control end, a first capacitor C1 and a voltage stabilizing diode Z1 are connected between the first pin and the third pin of the second field effect transistor Q2 in parallel, the afterglow phenomenon is thoroughly eliminated through an active discharge mechanism, and the problems that a traditional passive scheme is delayed in response and high in cost are solved. The circuit is simple in structure and high in compatibility, and has the advantages of low cost and high reliability.

To provide an automobile side mirror direction indicator control system having a rational structure, exhibiting an excellent warning effect of a vehicle lamp, and having high safety and reliability, and ease of use.SOLUTION: This automobile side mirror direction indicator control system comprises: a power management module 100; a MCU control module 200; a switching control circuit 300; at least two drive circuits 400, 410, 420; at least two LED light emission modules 500, 510, 520; a signal detection circuit 600; and a signal interface circuit 700. The power management module is used for supplying power to the MCU control module. The MCU control module controls each of at least two drive circuits by the switching control circuit. The at least two drive circuits each control at least two LED light emission modules. The MCU control module controls the signal interface circuit by the signal detection circuit.SELECTED DRAWING: Figure 1

Disclosed are a pixel circuit, a pixel circuit driving method and a display device. The pixel circuit includes a light-emitting element, a capacitor structure, a driving transistor, and first to fourth switching elements. The first switching element connects a data line for providing a data signal to a first terminal of the capacitor structure in response to a first scan signal. The second switching element connects a first terminal of the driving transistor to a control terminal of the driving transistor and a second terminal of the capacitor structure respectively in response to a second scan signal. The third switching element connects a second terminal of the driving transistor to a first terminal of the light-emitting element in response to a third scan signal. The fourth switching element connects a first power signal terminal to the first terminal of the driving transistor in response to a fourth scan signal.

Solid state transducers with state detection, and associated systems and methods are disclosed. A solid state transducer system in accordance with a particular embodiment includes a support substrate and a solid state emitter carried by the support substrate. The solid state emitter can include a first semiconductor component, a second semiconductor component, and an active region between the first and second semiconductor components. The system can further include a state device carried by the support substrate and positioned to detect a state of the solid state emitter and / or an electrical path of which the solid state emitter forms a part. The state device can be formed from at least one state-sensing component having a composition different than that of the first semiconductor component, the second semiconductor component, and the active region. The state device and the solid state emitter can be stacked along a common axis. In further particular embodiments, the state-sensing component can include an electrostatic discharge protection device, a thermal sensor, or a photosensor.

The invention discloses a silicon controlled rectifier dimming device of an LED driving power supply. The silicon controlled rectifier dimming device comprises a voltage transformation unit, a rectification filtering unit, a first switch unit, a first filtering unit, a first voltage stabilization unit, a phase detection module and a control unit, the pre-stage circuit carries out voltage conversion and outputs steamed bun waves subjected to phase cutting control, reflected voltage of the voltage transformation unit is rectified into pulse waves through the rectification unit, the pulse waves are subjected to voltage division through the voltage distribution unit to drive the second switch unit, the pulse waves are converted into square waves with a duty ratio, and the square waves are converted into square waves with the duty ratio. The control unit outputs a corresponding driving waveform to the first switch unit according to the size of the square wave duty ratio, and the first switch unit is driven to carry out voltage chopping, so that the output current is changed in a range of 1-100% for dimming. The phase detection module is matched with the rectification filtering unit to filter clutters in the voltage signals so as to improve the detection precision, and the first filtering unit is matched with the first switch unit to fill up the energy lost by the waveform, so that the output current is smoother.

The application discloses a pixel driving circuit and a display panel, and belongs to the technical field of display. The pixel driving circuit comprises a light-emitting module, a first switch module, a second switch module and a driving module. Due to the difference in parasitic capacitance in different sub-pixel driving circuits in the display panel, the display brightness in different sub-pixel driving circuits may be different. The application combines the above modules, when the first switch module pulls down the storage voltage of the driving module due to the feedthrough effect, the second switch module provides a pull-down compensation voltage under the driving of the reverse gate driving voltage, thereby effectively inhibiting the feedthrough effect in the pixel driving circuit and improving the uniformity of the display panel.

The invention relates to a protection circuit for protecting a load. The protection circuit comprises an input node adapted to be couplable to a SMPS, a bleeder coupled between the input and a return node, a first output node adapted to be coupled to the input node and a load, a second output node adapted to be coupled to the load, wherein the load is couplable between the first output node and the second output node, an impedance coupled between the second output and the return node, a switch coupled in parallel with the impedance, and a controller adapted to control the switch and the bleeder, wherein the controller is adapted to activate the bleeder and open the switch when a voltage across the impedance is above a threshold and wherein the controller is adapted to deactivate the bleeder and close the switch when the voltage across the impedance is below the threshold.

Provided is a display panel. The display panel includes: a substrate; and a plurality of pixels on the substrate, wherein at least one of the plurality of pixels includes a plurality of sets of sub-pixels, at least one set of the plurality of sets of sub-pixels including a plurality of sub-pixels of a same color; wherein each of the plurality of sub-pixels includes: a drive circuit, coupled to a first control line, a data line, a first power line, and a first node; a compensation circuit, coupled to a second control line, a sensing line, and the first node; a light-emitting element, coupled to the first node and a second power line; and a shielding circuit, connected in series to any light-emitting channel.

The invention relates to a control circuit for a switching circuit. The switching circuit receives an input signal and converts the input signal into an output current flowing through an LED load by controlling on and off of at least one switch. Wherein the control circuit comprises an error amplification circuit, a current control circuit and an overcurrent control circuit, and the error amplification circuit receives a detection signal representing output current and a reference signal and compares the detection signal with the reference signal to generate a current control signal. The current control circuit receives a current control signal and a triangular wave signal, and generates a switch control signal according to the current control signal and the triangular wave signal to control the on and off of the at least one switch. The over-current control circuit controls the current control signal according to a comparison result of the detection signal and the over-current signal, and when the detection signal is larger than the over-current signal, the current control signal is reduced to a preset voltage. According to the technical scheme, rapid adjustment of the output current when the load LED changes is achieved, and the reliability and the service life of the LED are effectively improved.

The invention provides an LED dimming constant-voltage power supply self-adaptive to load voltage and an overload protection method thereof, and the power supply comprises a main control circuit which is used for outputting a first reference voltage signal to enable a controlled voltage conversion circuit to be maximum voltage output, and outputting a PWM dimming signal to drive a first transistor through a chopper circuit. And outputting a switching signal to initiate voltage detection of the load; the self-detection circuit comprises a constant current source circuit and a first operational circuit, and the constant current source circuit is connected with a load to form a constant current power supply loop; the first operational circuit is used for measuring load voltage and outputting a voltage sampling signal to the main control circuit; the master control circuit outputs a second reference voltage signal to the controlled voltage conversion circuit according to the voltage sampling signal so that the controlled voltage conversion circuit can be adjusted to load voltage output. According to the invention, load voltage detection and load power supply voltage adjustment are realized by controlling the self-detection circuit, and overload protection under different output voltages is realized through the overload protection circuit.

The application relates to a linear thyristor light-adjusting full-voltage constant-power input circuit, wherein a thyristor light adjuster is arranged in communication with an external voltage in front of an input protection circuit, a bridge rectifier circuit is arranged at the rear end of the input protection circuit, an output end of the input protection circuit is connected with a voltage conversion detection circuit, the voltage conversion detection circuit is connected with a full-voltage control circuit, a power supply resistor R11 is connected with the output end of the bridge rectifier circuit, the power supply resistor R11 is connected with the full-voltage control circuit, a series-parallel conversion circuit is connected with the full-voltage control circuit, and an isolation circuit is connected with the series-parallel conversion circuit, wherein four groups of full-balance circuits, reference position circuits, lamp string circuits and filter circuits are arranged respectively, the full-balance circuits, the reference position circuits and the lamp string circuits are connected correspondingly, the filter circuits are connected in parallel at both ends of the lamp string circuit, and the isolation circuit is connected between the full-balance circuit and the reference position circuit. The input circuit can realize full-voltage constant-power input, has strong universality and low cost.

A small light-emitting device is provided. A light-emitting device which is less likely to produce a shadow is provided. A structure including a switching circuit for supplying a pulsed constant current and a light-emitting panel supplied with the pulsed constant current has been conceived.

An LED quick activation system includes a driving circuit, a loading module, a filter capacitor, a current control switch, a quick discharging module and a primary controller. The primary controller records a preceding discharging parameter that the filter capacitor requires to discharge its cross voltage from a target charging voltage to the loading module's LED unit's barrier voltage. The primary controller calculates an equivalent charging period of charging the filter capacitor's cross voltage to the target charging voltage using the discharging parameter. The primary controller controls the current control switch to charge the filter capacitor and the loading module using the driving current of a charging amplitude during the equivalent charging period. The primary controller charges the filter capacitor and the loading module using the driving current of a regular amplitude after the equivalent charging period passes.

An under-screen camera assembly, a backlight module and a display apparatus. The under-screen camera assembly includes: an Organic Light Emitting Diode (OLED) screen, where the OLED screen is provided with an OLED high transmittance region; a first polarizer and a second polarizer both disposed on the OLED high transmittance region, where the second polarizer is stacked on the first polarizer; liquid crystals disposed between the first polarizer and the second polarizer; and a Thin Film Transistor (TFT) driving circuit disposed on the second polarizer and configured for driving the liquid crystals to deflect.

The present application provides a compensation circuit (2), a control chip and a display device. A compensation circuit (2) is applied to a drive circuit (1). The drive circuit (1) includes a first TFT (T1), a second TFT (T2), an OLED, and a capacitance (C). The compensation circuit (2) includes a third TFT (T3) and a detection module (201). A control electrode (T3a) of the third TFT (T3) is configured to be connected with a second electrode (T2c) of the second TFT (T2), a first electrode (T3b) of the third TFT (T3) is configured to be connected with a control electrode (T2a) of the second TFT (T2). A detection module (201) is respectively connected to a second electrode (T3c) of the third TFT (T3), a scan line (Scan) and a Data line (Data), respectively. The detection module (201) is configured to be turned off and turned on respectively when receiving two continuous voltage signals output from the second electrode (T3c) of the third TFT (T3). The compensation circuit (2) has simple circuit connection, and has solved the problem of low luminosity factor of OLED panel caused due to drifting of threshold voltage of the OLED panel, and ensures the luminosity factor of the OLED panel.