Wide-Load LED Driver Circuit for Stable Current Regulation
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Solution Overview
Problem
Existing LED driver power supplies exhibit inadequate load regulation, leading to significant power errors and brightness fluctuations under varying load conditions.
Innovation Solution
A load regulation optimization circuit comprising a voltage input module, input undervoltage and overvoltage protection module, high-voltage startup module, BOOST module, over-power protection module, voltage output module, output voltage feedback module, current compensation module, power supply module, and control module, which collectively stabilize current flow through the LED load by adjusting duty cycles in response to voltage variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing LED driver power supply is used, then basic power conversion is achieved, but load regulation is inadequate leading to power errors and brightness fluctuations
Solution Approach 1:
The patent implements a feedback mechanism where the output voltage feedback module samples the voltage and feeds it back to the control module. The control module then adjusts the duty cycle of the driving output through the current compensation module to stabilize the current flowing through the LED load, thereby improving load regulation and reducing power errors.
Solution Approach 2:
The system performs self-regulation by automatically adjusting its own operating parameters. When the output voltage feedback module detects voltage variations, the control module autonomously modifies the duty cycle to maintain stable current flow, enabling the system to self-correct load regulation issues without external intervention.
2Illumination intensity
If existing LED driver power supply is used, then power conversion is provided, but brightness fluctuations occur under varying load conditions
Solution Approach 1:
The feedback loop continuously monitors output voltage and adjusts the duty cycle accordingly, ensuring stable current flow through the LED load regardless of load condition variations. This maintains consistent brightness output even when LED load conditions change.
Solution Approach 2:
The system dynamically adjusts the duty cycle of the driving output in response to changing load conditions. The control module modifies operating parameters in real-time based on feedback from the output voltage feedback module, enabling the system to adapt to varying LED load conditions while maintaining stable brightness.
Data Source
AI summary
A load regulation optimization circuit for a wide-load light-emitting diode (LED) driver power supply includes: a voltage input module configured to convert an alternating current (AC) into a direct current (DC) for output; and an input undervoltage and overvoltage protection module configured to detect a voltage condition of the voltage input module and provide a feedback to a control module. Compared with the prior art, the present disclosure has the following beneficial effects. In the present disclosure, a current compensation module is configured to feed voltage variation information back to the control module when a voltage variation occurs at an LED load due to an LED load variation. Thus, the control module changes the duty cycle of a driving output, thereby ultimately changing the output current of a voltage output module to maintain a stable current flowing through the LED load.