LED Driver Circuit Reducing Output Overshoot
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Solution Overview
Problem
Existing LED driver circuits experience overshoot in output signals due to changes in input, output, or set point signals, which can cause damage to LEDs and lead to inaccuracies in power regulation.
Innovation Solution
A circuit comprising a power converter unit, a set point unit, and a correction unit that regulates the output signal by delivering a correction signal based on input, output, and set point parameter values to minimize overshoot, using a DC-to-DC power converter with a switch/inductor unit and current sensors to control the output current and voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a DC to DC power converter is used to regulate output signal, then power regulation accuracy is improved, but overshoot occurs in output signal when input, output, or set point parameters change
Solution Approach 1:
The correction unit calculates a correction signal in advance based on predicted overshoot conditions. When parameter changes are detected, the correction signal is prepared and applied proactively to counteract the anticipated overshoot, rather than reacting after overshoot occurs. This preliminary action prevents the harmful effect while maintaining regulation accuracy.
Solution Approach 2:
The system continuously monitors input parameter values, output parameter values, and set point parameter values, and uses this feedback to dynamically adjust the correction signal. The correction unit receives real-time feedback about system state and modifies the correction signal accordingly to maintain optimal overshoot compensation while preserving power regulation accuracy.
2Reliability
If correction signal is applied to reduce overshoot, then output signal stability is improved, but device complexity increases due to additional correction unit
Solution Approach 1:
The correction unit is integrated with the existing power converter control architecture. The correction signal is combined with the standard control signal in a unified control path, merging the overshoot compensation function with the existing power regulation circuitry. This integration approach reduces overall device complexity compared to adding a completely separate correction system.
Solution Approach 2:
The correction unit is designed to handle multiple types of parameter changes (input voltage variations, output load changes, set point adjustments) using a single unified correction mechanism. This multi-functional approach allows one correction unit to address various overshoot scenarios, reducing the need for multiple specialized correction circuits and thereby minimizing device complexity.
Data Source
AI summary
This disclosure includes systems, methods, and techniques for controlling delivery of power to one or more strings of light-emitting diodes (LEDs). For example, a circuit is configured to monitor current through one or more strings of LEDs. The circuit includes a power converter unit, where the power converter unit is configured to receive an input signal from a power source, and where the power converter unit is configured to deliver an output signal to the one or more strings of LEDs, and a set point unit configured to deliver a set point signal to the power converter unit. Additionally, the circuit includes a correction unit configured to deliver, based on an input parameter value, an output parameter value, and a set point parameter value, a correction signal to the power converter unit.