Solid-State Light Emitter Power Supply With Phase-Cut Dimming
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Solution Overview
Problem
Existing dimmable power supplies for solid-state light emitters cannot increase the brightness of one or more light emitters beyond 100% of the supply power level, limiting their flexibility in applications requiring adjustable brightness.
Innovation Solution
A power supply system comprising rectifier circuits, a power factor correction stage, flyback converters, and a microcontroller that receives phase-cut signals to output pulse-width modulation control signals, allowing for the distribution of power output portions to solid-state light emitters, enabling one emitter to be brightened beyond 100% at the expense of another.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a dimmable power supply is used to adjust the brightness of solid-state light emitters, then the brightness can be reduced to less than 100% of the supply power level, but it is not possible to increase the brightness beyond 100%
Solution Approach 1:
The power supply system is divided into multiple independent flyback converter circuits (first flyback converter, second flyback converter, etc.), each capable of receiving power from a common power factor correction stage. This segmentation allows each converter to be independently controlled to output power greater than 100% of the original supply by drawing from the shared PFC stage, thereby enabling brightness levels beyond the traditional 100% limit while maintaining individual control over each light emitter.
2Ease of operation
If multiple solid-state light emitters are powered by separate mains power sources with dimmable power supplies, then each can be independently dimmed, but the system complexity increases
Solution Approach 1:
Multiple flyback converter circuits are merged into a single power supply system that shares a common power factor correction stage and common electrical connection to the mains power source. This merging reduces system complexity by eliminating the need for separate power supplies for each light emitter, while still maintaining independent dimming control through individual PWM control signals generated by a microcontroller for each converter circuit.
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
Enables adjustable brightness beyond 100% for one or more solid-state light emitters by redistributing power, accommodating applications needing increased brightness while maintaining efficient power management.
Implementation Method 1
Each rectifier circuit is configured to receive a respective phase-cut signal from the respective dimmer circuit as input and output a respective phase-cut rectified power signal
Implementation Method 2
The PFC stage is configured to receive a sum of the first phase-cut rectified power signal and the second phase-cut rectified power signal as input and output a power-factor corrected electrical power
Implementation Method 3
The input circuits of the flyback converters are coupled to the PFC stage. The input circuits of the flyback converters are connected to the PFC stage in parallel. The output circuits of the flyback converters are configured to power a respective load including a respective solid-state light emitter
Implementation Method 4
The microcontroller is configured to receive signals derived from the phase-cut signals (phase-cut derived signals) as inputs and output respective pulse-width modulation (PWM) control signals to the respective flyback input circuits in accordance with respective power output portions
Data Source
AI summary
A solid-state light emitter power supply includes a first rectifier circuit, a second rectifier circuit, a power factor correction (PFC) stage, a first flyback converter, a second flyback converter, and a microcontroller. The rectifier circuits are configured to receive phase-cut signals from respective dimmer circuits as inputs and output respective phase-cut rectified power signals. The PFC stage is configured to receive a sum of the phase-cut rectified power signals as input and output a power-factor corrected electrical power to the flyback converters. The flyback converters are connected in parallel and are configured to power respective loads including a respective solid-state light emitter. The microcontroller is configured to receive signals derived from the phase-cut signals as inputs and to output respective pulse-width modulation (PWM) control signals to each of the flyback converters. Each flyback converter receives a respective power output portion of the power-factor corrected electrical power in accordance with the respective PWM control signals.