Driver Circuit Current Overshoot Adjustment
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Solution Overview
Problem
Existing driver circuits for light emitting elements in processing devices, such as laser exposure and machining devices, face challenges in accurately controlling the current flowing through the light emitting elements, which affects the precision of processing operations.
Innovation Solution
A driver circuit comprising a current-controlling switching element, a differential amplifier circuit, and an adjustment part, where the differential amplifier circuit controls the current based on reference and detection signals, and the adjustment part adjusts the overshoot of the current's rising edge, ensuring precise current control for the light emitting element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a conventional driver circuit is used to control the light emitting element, then the circuit structure is simple, but the current control precision is insufficient affecting processing accuracy
Solution Approach 1:
The patent implements a feedback control mechanism where a detection circuit monitors the actual current flowing through the light emitting element and feeds this information back to a control unit. The control unit compares the detected current with the target current and adjusts the driving signal accordingly, enabling precise current control and thereby improving processing accuracy.
Solution Approach 2:
The patent dynamically adjusts driving parameters including current magnitude, pulse width, and frequency based on real-time detection results. The control unit modifies these parameters adaptively to maintain optimal current levels, ensuring high processing precision while accommodating variations in the light emitting element's characteristics.
2Measurement precision
If the current flowing in the light emitting element is not controlled accurately, then the circuit operation is simple, but the light intensity control precision is insufficient
Solution Approach 1:
The detection circuit continuously monitors the actual current through the light emitting element and provides real-time feedback to the control unit. This closed-loop feedback mechanism enables precise measurement and control of light intensity by dynamically adjusting the driving current based on detected deviations from the target value.
Solution Approach 2:
The patent replaces manual or open-loop mechanical current control with an automated electronic control system that uses electrical detection and electronic adjustment. The control unit electronically modulates the driving current based on detection signals, achieving precise light intensity control without mechanical intervention.
3Speed
If the rising edge of the current has excessive overshoot, then the circuit response is fast, but the processing accuracy deteriorates
Solution Approach 1:
The control unit applies preliminary anti-action by detecting current overshoot on the rising edge and applying a counteracting adjustment to reduce the overshoot. When overshoot is detected, the control unit modifies subsequent driving signals to compensate for the excessive current spike, thereby maintaining processing accuracy while preserving fast response characteristics.
Solution Approach 2:
The patent implements dynamic control of the current waveform by continuously monitoring the rising edge behavior and adaptively adjusting the driving signal characteristics. The control unit dynamically modifies pulse width, frequency, and amplitude based on real-time detection of overshoot conditions, optimizing both response speed and processing accuracy through adaptive waveform shaping.
Data Source
AI summary
A driver circuit includes: a current-controlling switching element electrically connected to a light emitting element; a differential amplifier circuit including: an output terminal electrically connected to the current-controlling switching element, a first input terminal configured to receive a reference signal as a reference for radiating light with a desired intensity from the light emitting element, and a second input terminal configured to receive a detection signal corresponding to a detection result of a current flowing in the light emitting element, wherein the differential amplifier circuit is configured to control the current flowing in the light emitting element and the current-controlling switching element based on a voltage of the first input terminal and a voltage of the second input terminal; and an adjustment part configured to adjust an overshoot amount of a rising edge of the current flowing in the light emitting element.