Discharge Lamp Igniter Nullifies Abnormality Detection During Startup
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing discharge lamp igniting apparatuses often incorrectly identify unstable initial operation as abnormality, leading to frequent power interruptions and ignition failures, especially when the current is below a predetermined reference current before the lamp is fully turned on.
Innovation Solution
A discharge lamp igniting apparatus that includes power supply means, abnormality detecting means, output nullifying means, and control means to temporarily allow power supply during initial instability, enabling repeated high voltage superposition attempts and counting retrials, with a timer for output nullification, to ensure proper ignition without premature power interruption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the abnormality detecting means detects current below reference current to identify abnormality, then abnormal arcing can be detected, but the discharge lamp is incorrectly judged as abnormal during initial unstable operation, causing frequent power interruptions and ignition failures
Solution Approach 1:
The output nullifying means is activated in advance during a predetermined time period after power supply starts, preventing the abnormality detecting means from generating false abnormality signals during the lamp's initial unstable operation phase. This preliminary nullification action allows the lamp to stabilize without incorrect power interruptions.
Solution Approach 2:
The system dynamically adjusts the abnormality detection function by temporarily disabling it during the initial operation phase and then activating it for steady-state monitoring. This dynamic control of detection sensitivity resolves the contradiction between early abnormality detection and avoiding false positives during startup.
2Reliability
If power supply is interrupted when current is below reference current, then abnormal states can be stopped, but stable initial operation is disrupted, preventing proper lamp ignition
Solution Approach 1:
The output nullifying means performs a preliminary disabling action during the predetermined time period, preventing the power supply interruption that would occur if abnormality detection were active during startup. This ensures the lamp can complete its ignition process without premature power cutoff.
Solution Approach 2:
The system provides protective cushioning by nullifying the abnormality detection output during the critical initial phase, acting as a buffer that prevents harmful power interruptions before they can occur, while still maintaining detection capability for actual abnormalities.
3Measurement precision
If abnormality detection is enabled immediately, then abnormalities can be detected early, but false detection occurs during initial unstable operation, reducing ignition success
Solution Approach 1:
The output nullifying means is activated in advance during a predetermined time period after power supply starts, preventing the abnormality detecting means from generating false abnormality signals during the lamp's initial unstable operation phase. This preliminary nullification action allows the lamp to stabilize without incorrect power interruptions.
Solution Approach 2:
The system dynamically adjusts the abnormality detection function by temporarily disabling it during the initial operation phase and then activating it for steady-state monitoring. This dynamic control of detection sensitivity resolves the contradiction between early abnormality detection and avoiding false positives during startup.
Data Source
AI summary
A power supply circuit (4) is responsive to an activating signal by supplying a discharge lamp (2) with an operating voltage on which a high voltage is temporality superposed. An insufficient current detecting circuit (46) detects abnormality of an output current supplied to the discharge lamp (2) from the power supply circuit (4). A CPU (52) stops the operation of the power supply circuit (4) in response to detection of abnormality by the insufficient current detecting circuit (46). An output nullification time period timer (50) nullifies the output of the insufficient current detecting circuit (46) for a predetermined time period measured from the supplying of the activating signal.