Lamp Preheating Control Device Dynamic Frequency Adjustment
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Solution Overview
Problem
Conventional preheating control methods for lamps, especially in hot start scenarios, lead to over-preheating and unnecessary power consumption due to delayed turn-on and excessive current supply, which can shorten the lamp's lifespan.
Innovation Solution
A preheating control device and method that dynamically adjusts the preheating voltage and frequency of the oscillator signal based on the lamp current, quickly decreasing the frequency to a minimum when the lamp current is detected, thereby reducing the preheating time and maintaining the current at a normal state level after turn-on.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the preheating frequency is increased during the preheating period (step method), then the preheating time is decreased, but the filament temperature becomes excessively high in hot start scenarios, causing the lamp to turn on before the threshold period elapses and forcing a delay that generates unnecessary power consumption
Solution Approach 1:
The patent applies dynamics by making the preheating control voltage variable rather than fixed. The control voltage changes according to the passage of preheating time and the generation of lamp current, allowing the system to adapt to different operating conditions (cold start vs. hot start) and prevent both over-preheating and premature turn-on, thereby resolving the contradiction between reducing preheating time and avoiding unnecessary power consumption
Solution Approach 2:
The patent implements feedback by detecting the lamp current and using this information to adjust the preheating control voltage. When lamp current is detected, the control voltage is changed to decrease the oscillator frequency, which prevents premature turn-on and avoids the forced delay that would cause unnecessary power consumption, thus resolving the energy loss issue while maintaining efficient preheating
2Loss of time
If the preheating frequency is increased during the preheating period, then the preheating time is decreased, but the lamp voltage capability to turn on the lamp becomes insufficiently considered, causing premature turn-on before the legally required threshold period
Solution Approach 1:
The patent uses feedback by continuously monitoring lamp current and using this information to adjust the preheating control voltage. This feedback mechanism ensures that the lamp only turns on after the threshold period has elapsed and the lamp current is properly generated, maintaining legal compliance while still allowing for optimized preheating timing
Solution Approach 2:
The patent changes parameters dynamically by adjusting the preheating control voltage based on preheating time and lamp current generation status. This parameter adjustment ensures that the oscillator frequency is appropriately modified to meet the threshold period requirement while optimizing the preheating process, thus resolving the contradiction between reducing preheating time and ensuring turn-on timing compliance
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the preheating time, prevents lamp damage from excessive current, and extends the lamp's lifespan by optimizing current supply during the preheating period.
Implementation Method 1
the step method supplies a higher current to the filament of the lamp during the preheating period
Data Source
AI summary
The present invention relates to a preheating control device controlling lamp preheating, a lamp driving device including the same, and a preheating control method thereof. A preheating control device according to an exemplary embodiment of the present invention generates a preheating control voltage that is changed according to a passage of a preheating time of a lamp and generation of a lamp current of the lamp. An oscillator signal having a frequency according to a preheating control voltage is generated, and if the lamp current is generated in the lamp, the preheating control voltage is changed to more than a predetermined reference voltage such that the frequency of the oscillator signal may be decreased.