Light Source Driving Module Dynamic Frequency Control
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Solution Overview
Problem
Long rising periods in light source devices, such as LED projectors, lead to adverse effects on brightness stability, affecting visual quality, while increasing production costs due to high-frequency switching that can cause switching loss and electromagnetic interference.
Innovation Solution
A light source driving module and method that dynamically adjust the operating frequency of the light source driving signal, using a frequency setting module, driving circuit, and conversion module to shorten the rising period by increasing the frequency during this phase and maintaining a lower frequency during the stable period, thereby balancing brightness stability and cost reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If high-frequency switching is used to shorten the rising period, then brightness stability is improved, but switching loss and electromagnetic interference increase
Solution Approach 1:
The patent applies dynamics by making the switching frequency adjustable rather than fixed. The controller dynamically changes the switching frequency of the light source driving signal based on the operational phase: using high frequency during the rising period to ensure brightness stability, and low frequency during the stable period to reduce switching loss and electromagnetic interference. This dynamic adaptation resolves the contradiction between brightness stability and energy loss.
Solution Approach 2:
The patent changes the parameter of switching frequency from a constant value to a variable parameter. By adjusting the frequency parameter according to different operational phases (rising period vs. stable period), the system optimizes performance: high frequency during rising ensures brightness stability, while low frequency during stable operation reduces switching loss and electromagnetic interference.
2Stability of the object's composition
If high-frequency switching is used to shorten the rising period, then brightness stability is improved, but electromagnetic interference increases
Solution Approach 1:
The system dynamically adjusts switching frequency based on operational needs. During the rising period, high frequency is used to ensure brightness stability. During the stable period, frequency is reduced to minimize electromagnetic interference. This temporal separation of frequency levels resolves the contradiction between brightness stability and electromagnetic interference.
Solution Approach 2:
The switching frequency parameter is changed from fixed to variable. The controller modifies this parameter according to the operational phase: high frequency during rising period for brightness stability, low frequency during stable period to reduce electromagnetic interference. This parameter adaptation resolves the technical contradiction.
3Ease of manufacture
If long rising period is used, then production cost is reduced, but brightness stability deteriorates
Solution Approach 1:
The patent uses dynamic frequency adjustment to achieve brightness stability without requiring a long rising period. By using high-frequency switching during the rising period, the system can achieve stable brightness quickly, allowing for a shorter rising period and thus reducing production costs while maintaining brightness stability.
Solution Approach 2:
The switching frequency parameter is increased during the rising period to enable faster stabilization of brightness. This allows the rising period to be shortened while still achieving the required brightness stability, thereby reducing production costs without sacrificing performance.
Data Source
AI summary
A light source driving method is applied to a light source driving module electrically connected to a light source and a controller. The light source driving module includes a frequency setting module, a driving circuit, and a conversion module. The frequency setting module generates a frequency setting signal according to a switching signal. The driving circuit generates a light source driving signal after receiving the switching signal and a current control signal. The conversion module selectively generates a driving current flowing through the light source in response to the light source driving signal. The driving current increases continuously during a rising duration, and the light source driving signal has a first operating frequency during the rising period. The driving current remains unchanged during a stable duration, and the light source driving signal has a second operating frequency during the stable period.