LED Lighting Apparatus Balancing Circuit Uniform Dimming
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Solution Overview
Problem
Conventional LED lighting apparatuses experience uneven illumination and low usage rates of LEDs due to differences in light emission voltages and the non-linear operation of dimmers, which can result in weak light emission and reduced reliability when the rectified voltage is controlled below the dimming-off level.
Innovation Solution
The LED lighting apparatus includes a rectifier circuit, channel unit, balancing resistor, balancing circuit, and driver that provide a discharge path and regulate current to ensure uniform light emission across LED groups, preventing holding currents from activating LEDs below the dimming-off level, and using capacitors to reduce flicker and maintain consistent light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED groups have different numbers of LEDs or different light emission voltages to achieve sequential light emission, then the LED lighting apparatus can operate with rectified voltage, but uneven illumination occurs between LED groups
Solution Approach 1:
The patent applies local quality by introducing individual current regulating circuits for each LED group. These circuits locally adjust the current supplied to each LED group based on their specific characteristics (number of LEDs, light emission voltages), ensuring uniform illumination while maintaining the energy-efficient rectified voltage operation.
Solution Approach 2:
The patent changes the current parameter dynamically for each LED group through dedicated current regulating circuits. By adjusting the current magnitude according to the specific configuration of each LED group, the system achieves uniform illumination output despite differences in LED count and voltage characteristics across groups.
2Device complexity
If LED groups sequentially emit light to simplify circuit design, then the apparatus can use rectified voltage directly, but the usage rates of LEDs in respective LED groups become different and reduce overall LED utilization
Solution Approach 1:
The patent implements dynamic control through current regulating circuits that can independently adjust current to each LED group. This dynamic capability allows the system to optimize LED usage by ensuring all LED groups operate at appropriate current levels, improving overall LED utilization while maintaining circuit simplicity through modular regulation.
3Adaptability or versatility
If a dimmer is used to control the phase angle of AC voltage for dimming function, then brightness can be adjusted, but the non-linear operation characteristic causes uneven illumination
Solution Approach 1:
The patent employs feedback mechanisms in the current regulating circuits that monitor the actual current supplied to each LED group and adjust accordingly. This feedback compensates for the non-linear effects of dimmer operation, ensuring uniform illumination across all LED groups even when phase angle control is applied for dimming.
Solution Approach 2:
The patent dynamically adjusts current parameters in response to dimmer control signals. By modifying the current magnitude and distribution to each LED group based on the dimming level, the system maintains uniform illumination characteristics across the full dimming range despite the non-linear phase angle control.
4Adaptability or versatility
If the rectified voltage is controlled below the dimming-off level to turn off the light source, then dimming function is achieved, but the holding current of the dimmer flows through part of the LEDs causing weak light emission
Solution Approach 1:
The patent extracts and separately manages the holding current path from the main LED driving circuit. By providing a dedicated discharge path for holding current through the channel unit, the system prevents holding current from flowing through the LEDs, ensuring complete turn-off and maintaining light source reliability while preserving dimming functionality.
Solution Approach 2:
The patent introduces a channel unit as an intermediary component between the rectifier circuit and the LED groups. This intermediary provides a controlled discharge path for holding current, acting as a mediator that redirects potentially harmful holding current away from the LEDs, preventing weak light emission and ensuring reliable turn-off.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration achieves uniform dimming, improves LED usage rates and lifetimes, and prevents weak light emission by blocking holding currents, resulting in consistent and reliable illumination across all LED groups.
Implementation Method 1
The LED lighting apparatus converts an AC voltage into a rectified voltage, and drives a current using the rectified voltage
Implementation Method 2
The LED is differentiated from other light sources in terms of various aspects such as energy consumption, lifetime, and light quality. Since the LED is driven by a current
Data Source
AI summary
Disclosed is an LED lighting apparatus which includes LED groups and emits light in response to a change of a rectified voltage. The LED lighting apparatus includes a balancing circuit which controls the rectified voltage to be applied to the LED groups in parallel or series to each other.