Lighting Load Dimmer Feedback for Low-Noise MOSFET Switching
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Solution Overview
Problem
Conventional dimmers produce noisy power signals due to transistor circuitry, leading to unwanted effects such as reduced bulb lifespan, variance in light brightness, and audible noise, particularly when controlling different types of lighting loads.
Innovation Solution
Implementing feedback circuitry to control the switching timing of MOSFETs in dimmer circuitry, using closed-loop feedback signaling to reduce signal noise and improve control over the power provided to lighting loads.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional transistor circuitry is used in dimmer circuitry, then dimming control is achieved, but signal noise is generated
Solution Approach 1:
The patent implements feedback circuitry that senses the output signal from the MOSFET and adjusts the gate drive signal accordingly. This closed-loop feedback system reduces signal noise by actively compensating for disturbances and maintaining stable operation of the MOSFET switching elements during AC mains cycling.
2Power
If conventional dimmer circuitry is used, then power control for lighting loads is achieved, but bulb lifespan is reduced
Solution Approach 1:
The feedback circuitry monitors the power signal characteristics and adjusts MOSFET switching timing to minimize noise generation. This reduces electrical stress and wear on bulb components, thereby extending bulb lifespan while maintaining effective power control for various lighting loads.
Solution Approach 2:
The patent changes the switching parameters of the MOSFETs by controlling the gate voltage timing and duration. By optimizing these parameters through feedback control, the circuit reduces noise peaks and electrical stress on connected bulbs, leading to extended lifespan.
3Illumination intensity
If conventional dimmer circuitry is used, then light output control is achieved, but brightness variance occurs
Solution Approach 1:
The feedback circuitry continuously monitors the power signal and adjusts MOSFET gate drive timing to maintain consistent output. This closed-loop control compensates for variations in AC mains voltage and loading conditions, ensuring stable and consistent light brightness across different dimming levels.
Data Source
AI summary
An electronic device controlling power provided from a power source to an electrical load is described. The electronic device includes dimmer circuitry converting an alternating current (AC) power signal from the power source into a load power signal for the lighting load, and feedback circuitry generating signaling for controlling a switching timing of the dimmer circuitry. The electronic device generates feedback signaling for controlling an amount of power provided from an AC power source to an electrical load by turning on dimmer circuitry and generating a load power signal provided to a load, generating a feedback signal for controlling any of a voltage value, a timing, and a rate of change of a voltage applied to a gate of a metal oxide semiconductor field effect transistor (MOSFET), and controlling a transition through a threshold voltage of the MOSFET gate according to the feedback signal.