LED Dimmer Circuit Compensation Module Deep Dimming
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Solution Overview
Problem
Existing LED dimmer circuits that achieve deep dimming require additional dissipative elements, leading to unnecessary power dissipation and increased costs, failing to efficiently manage dimming ranges and energy consumption.
Innovation Solution
A dimmer circuit with a compensation module that collects sampled signals to adjust the output signal, allowing for deep dimming without dissipative elements, comprising a rectification module, control module, output module, and compensation module, which includes a sampling unit, trigger unit, and compensation unit to regulate the dimming effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dissipative elements are added to achieve deep dimming, then the dimming range is extended, but power dissipation and energy consumption increase
Solution Approach 1:
The patent changes the control parameter from simple phase cutting to a compensated control signal that adjusts the PWM duty cycle based on feedback from the sampling unit. This allows the system to achieve deep dimming by dynamically adjusting control parameters rather than using dissipative elements, thereby extending the dimming range while minimizing energy loss.
2Adaptability or versatility
If dissipative elements are added to achieve deep dimming, then the dimming range is extended, but circuit complexity and cost increase
Solution Approach 1:
The patent introduces a feedback mechanism where the sampling unit monitors the actual output current and feeds this information back to the control unit. The control unit then generates a compensated control signal that adjusts the PWM duty cycle accordingly. This feedback-based approach eliminates the need for additional dissipative elements while achieving deep dimming, thereby maintaining circuit simplicity and reducing cost.
3Illumination intensity
If phase cut angle is reduced to achieve deep dimming, then the dimming level is decreased, but the control precision is reduced
Solution Approach 1:
The sampling unit continuously monitors the actual output current and provides feedback to the control unit. This feedback mechanism allows the system to maintain high control precision even at low dimming levels by dynamically adjusting the PWM duty cycle based on the actual output, rather than relying solely on phase cut angle reduction which loses precision at extreme values.
Data Source
AI summary
A dimmer circuit may include: a rectification module, a control module and an output module, wherein the control module receives an input signal rectified through the rectification module and controls the output module to supply a load with an output signal in accordance with the input signal, and a compensation module which collects sampled signals characterizing dimming state of the dimmer circuit between the control module and the output module, and supplies the control module with a compensation signal in accordance with the sampled signals, the control module changing the value of the output signal according to the input signal and the compensation signal.