Configurable Light Source Driver for EMI and Stability
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Solution Overview
Problem
Driver devices for light sources like LEDs and laser diodes face challenges with electromagnetic interference (EMI) and operational instability, particularly in single-ended driver circuits, which are exacerbated at high frequencies, and differential driver circuits increase complexity and power consumption.
Innovation Solution
A configurable light source driver device that automatically selects between single-ended and differential driver circuits based on a resistor sensing terminal, using a pulse width adjustment circuit to minimize EMI and optimize circuit stability, allowing operation with low power consumption and reduced EMI emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single ended driver circuit is used, then the driver circuitry remains simple and power consumption is minimized, but transient voltage spikes generate high electromagnetic interference and signal distortion occurs at high frequencies
Solution Approach 1:
The patent implements a configurable driver device that can dynamically switch between single-ended and differential operating modes based on application requirements. The device includes circuitry that automatically detects and configures the appropriate mode, allowing the system to adapt its complexity and EMI characteristics in real-time rather than being fixed in one configuration.
Solution Approach 2:
The patent changes the operational parameters of the driver circuit by introducing configurable pulse width parameters and selectable operating modes. By adjusting the pulse width and switching between single-ended/differential modes, the system can optimize the balance between EMI generation, circuit complexity, and power consumption for different operating conditions.
2Object-affected harmful factors
If a differential driver circuit is used, then electromagnetic interference is minimized through cancellation of transient voltage spikes, but circuit complexity increases and power consumption rises
Solution Approach 1:
The patent implements a configurable driver device that can dynamically switch between single-ended and differential operating modes based on application requirements. The device includes circuitry that automatically detects and configures the appropriate mode, allowing the system to adapt its complexity and EMI characteristics in real-time rather than being fixed in one configuration.
Solution Approach 2:
The patent segments the driver circuit functionality into separate configurable modules, including independent pulse width adjustment circuits and mode selection logic. This segmentation allows the differential EMI cancellation capability to be activated only when needed, while keeping the base driver functionality simple and allowing selective activation of complexity-reducing features.
3Use of energy by moving object
If a single ended driver circuit operates at high frequencies, then power consumption remains low, but signal distortion and operational instability increase
Solution Approach 1:
The patent implements a configurable driver device that can dynamically switch between single-ended and differential operating modes based on application requirements. The device includes circuitry that automatically detects and configures the appropriate mode, allowing the system to adapt its complexity and EMI characteristics in real-time rather than being fixed in one configuration.
Solution Approach 2:
The patent changes the operational parameters of the driver circuit by introducing configurable pulse width parameters and selectable operating modes. By adjusting the pulse width and switching between single-ended/differential modes, the system can optimize the balance between EMI generation, circuit complexity, and power consumption for different operating conditions.
Data Source
AI summary
A configurable light source driver device includes circuitry that detects the presence of a resistor when connected to a terminal of the device and automatically configures the device to operate as a differential driver circuit with low EMI emission and a level of circuit stability that is selected on the basis of parasitic impedance conditions of the differential driver circuit. When the terminal is left unconnected, the configurable light source driver device automatically configures itself to operate as a single ended driver circuit with low power consumption and a different level of circuit stability that is selected on the basis of parasitic impedance conditions of the single ended driver circuit. Furthermore, the configurable light source driver device can include a pulse width adjustment circuit for modifying certain operating characteristics of each of the differential driver circuit and the single ended driver circuit.