LED Energy Efficiency Advances

Power adaptive control method for LED lamps that maximizes brightness and efficiency over temperature and voltage variations. The method involves measuring total voltage input to the lamp, comparing it to a threshold, adjusting lamp bead count, and iteratively fine-tuning PWM duty cycle to maintain constant power. This allows the lamp to operate at optimal brightness and efficiency over temperature and voltage changes. The control is done by a microprocessor that continuously collects lamp parameters and makes real-time adjustments based on optimal operating criteria.

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Controlling LED power supplies to prevent excessive power dissipation and improve lifetime when loads change. The method involves dynamically adjusting the rated current of the power supply based on output voltage. If output voltage exceeds a threshold, the rated current is reduced to limit power below the rated level. This prevents long-term operation at higher power that can degrade supply life.

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Adaptive dimming method for LED power supplies that automatically adjusts dimming levels based on usage patterns. The method involves tracking the startup and shutdown times of the LED power supply. By monitoring power on and off events, it determines the effective running time between starts. This adaptive dimming curve changes over time based on usage patterns rather than fixed dimming levels.

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Dimming control system for high-power light sources that allows smooth and efficient dimming of high-intensity lights like street lamps without strobing, flickering, or EMI issues. The system receives dimming commands and continuously monitors the light source. It dynamically adjusts power based on the command and real-time data to smoothly dim the lights. It also verifies commands, identifies interference, and calculates optimal power adjustments to avoid issues.

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Real-time power-based LED control method, device, and system that enables efficient and safe operation of LED lighting systems. The method involves monitoring and adjusting the power consumption of individual LEDs in real-time to prevent overcurrent and burning. It calculates the required power for each LED based on brightness and operating parameters. If the total power exceeds limits, it reduces brightness to stay within allowable ranges. This allows controlling multiple LEDs in a slave machine to prevent overcurrent compared to traditional methods that only monitor overall power. The real-time power monitoring and adjustment improves reliability and lifespan of LED lighting systems.

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LED lamp dimming controller that provides deep dimming without flicker. The controller converts PWM dimming signals into separate control signals for adjusting peak current and duration. This allows fine grained dimming by separately controlling peak current and energy duration. The peak current control signal adjusts the LED voltage to change brightness at low duty cycles where PWM is ineffective. The duration control signal adjusts the energy delivered. This provides deep dimming without flicker as the LED brightness can be adjusted over the entire duty cycle range.

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Flicker-free LED dimming system and method that provides smooth dimming without strobing at low brightness levels. The system uses a modified PWM dimming technique that allows precise control of the LED output current to eliminate flicker. It achieves this by using a dual-control strategy. At low duty cycles, a separate control signal is generated to accurately count the passing cycles of the PWM signal to fine-tune the output current. At higher duty cycles, the regular PWM signal is used. This prevents current interruptions that cause flicker at low brightness. By transitioning between the two control methods based on duty cycle, flicker-free dimming is achieved across the entire dimming range.

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Hybrid dimming method for LEDs that combines PWM and DC dimming to provide high resolution and high refresh rate LED dimming without losing brightness levels. The method involves expressing brightness as the product of pulse width and current. For brightness levels with 2N bits of PWM precision and 2M bits of DC precision, brightness is increased by stepping DC current and pulse width in sequence. This allows accurately representing all brightness levels without gaps. The method provides high resolution by combining PWM and DC dimming, and eliminates color shift and gray level loss issues of pure DC dimming.

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Balancing brightness of LED lights without exceeding comfortable human visual levels and preventing overheating. The brightness balance circuit connects between the LEDs and power supply. It adjusts the current through each LED channel based on the desired overall brightness to achieve a balanced output. This prevents excessive total brightness by dynamically adjusting the individual channel brightnesses.

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LED lamp driving system that can stabilize operating parameters of LED lamps in branches of a lighting setup without requiring higher voltage from the constant voltage source. It uses a sampling module to collect parameters of a target branch, a power processing circuit with adjustable input power, and a feedback loop to stabilize the branch parameters. The processing circuit adjusts its input power based on the sampling to match the branch requirements. This allows branches farther from the source to have lower voltage drops without needing higher source voltage.

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An LED lamp design enabling high-power LEDs to operate without external heat sinks. The design features a cylindrical transparent housing containing LEDs mounted on a flexible PCB rolled up inside. A thin transparent layer coats the PCB to protect the LEDs. The rolled PCB, along with the LEDs and driver components, is enclosed within the housing, allowing efficient heat dissipation directly into the surrounding air through the transparent housing.

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LED tube lamp with improved thermal management and reliability. The lamp has a glass tube with a diffusive layer. Inside, an LED light strip is attached by glue. The light strip has connecting pads at one end. LED light sources are mounted on the strip. A circuit board with components like a rectifier and filter is stacked against the strip end. The board is partly inside an end cap. This design allows better heat dissipation from the strip and components compared to traditional LED tube lamps.

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Lighting apparatus with an integrated anion generator for air purification that has a non-powered ventilation structure to provide effective heat dissipation from the LED chips. The lighting apparatus includes an anion generator inside the housing, an open-ended cylindrical anion-emitting tube that protrudes from the housing, a discharge electrode inside the housing opposite the tube opening, an LED circuit board above the housing, and a cover that only partially encloses the tube. Air holes allow outside air into the tube when anions are emitted, creating airflow that also cools the LEDs. The anion generator and vented tube provide air circulation without fans to dissipate LED heat.

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LED luminaire housing that uses a biodegradable plastic base to enclose the LEDs and driver. The bioplastic is designed to be suitable for LED luminaires, providing sufficient strength to enclose the LEDs and withstand the heat and environmental conditions. The bioplastic is made from materials like cellulose acetate, polylactic acid, polyhydroxyalkanoates, or thermoplastic starches.

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LED lighting device design that improves light output and color consistency over different angles. The design uses a lens assembly mounted over the LED, with a gap between the lens and elastomer encapsulant. This allows light to reflect off the lens surfaces instead of being absorbed by the elastomer. A reflector in the gap can further control light direction. The lens can also have features like a recess or scattering element to mix light. This reduces color variations and improves uniformity compared to traditional LED encapsulation.

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LED lighting device with improved cooling and modular construction to simplify assembly. The device has a lamp cap, case, power supply, heat exchange unit, and light emission unit. A buckle allows connecting the case and heat exchanger without bolts. The light emission unit connects to the heat exchanger for efficient heat transfer.

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Lighting apparatus with improved luminance using LEDs and reflectors, without increasing thickness or light sources. A reflective unit with a spaced area under each LED increases reflectivity and luminance. The spaced area can be defined by an optical pattern layer to replace a light guide plate.

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Balancing voltage drops and power consumption in multi-channel LED systems to improve efficiency and avoid overheating. The method involves adjusting the pulse width and amplitude of the LED current to maintain a constant product of current amplitude and duty cycle. This balances voltage drops across channels while keeping brightness the same. The circuit achieves this by using a single power device per channel to simultaneously adjust current amplitude and width. It also sets a phase offset between channels to reduce voltage ripple and fixes turn-off times to avoid voltage overshoot.

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A low-cost light-emitting device that can be used to create LED filament lamps that look like traditional incandescent bulbs. The device emits light in a spiraling pattern from a central elongated light guide. This guide has light in-coupling and out-coupling elements to efficiently capture and guide the light. The key features are collimating surfaces that maintain the spiraling light pattern and twisting the guide like a screw to enhance the appearance. This provides a cheaper, tunable, and clearer white light option compared to existing LED filament lamps.

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An LED lighting device that maximizes thermal coupling between the LED and heat sink to improve heat dissipation and reliability. The device has a recessed PCB that surrounds the LED module mounted on the heat sink. The PCB provides electrical control circuitry and the recess allows the LED to directly contact the heat sink.

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