Flashlamp Control System Using Pre-Pulse Plasma Ignition
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flashlamp systems face electrode damage and limited service life due to high temperature and pressure changes during main pulse generation, with existing pre-ignition methods being costly and limited by IGBT constraints, leading to inefficient energy use and reduced effectiveness.
Innovation Solution
A method involving a pre-pulse and main pulse generation using independent capacitor discharges, where a plasma voltage higher than the bias voltage is applied to ignite and maintain plasma, allowing precise timing and simultaneous ignition of multiple lamps without IGBT limitations, enabling cost-effective and long-lasting electronics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a main pulse of high current is applied to generate a flash, then the energy output and illumination intensity are improved, but the electrode temperature increases to several hundred °C causing thermal damage and limited service life
Solution Approach 1:
A pre-pulse is applied before the main flash pulse to pre-ionize the gas and prepare the plasma channel. This preliminary action reduces the electrical resistance of the discharge path, allowing the main pulse to achieve higher current and energy output without proportionally increasing electrode thermal stress, as the plasma is already partially formed
Solution Approach 2:
The flashlamp operates with periodic pulsing rather than continuous operation. The cycle includes pre-pulse, main pulse, and recovery phases. This periodic action allows thermal management between pulses and enables the system to sustain high peak powers while controlling average temperature and electrode degradation
2Reliability
If existing pre-ignition methods using IGBTs are used, then plasma ignition is achieved, but the system becomes costly and limited by IGBT constraints reducing effectiveness
Solution Approach 1:
The invention extracts and removes the IGBT components from the circuit, replacing them with a simpler electronic control architecture. The pre-pulse generation is achieved through alternative switching mechanisms that eliminate the need for expensive and complex IGBT modules, reducing system cost and complexity while maintaining reliable plasma ignition
Solution Approach 2:
The patent uses a simplified control circuit that replicates the functional behavior of IGBT-based pre-ignition systems without requiring the complex power semiconductor devices. The control logic and timing sequences are copied and implemented through more economical electronic components
3Measurement precision
If precise timing control of multiple lamps is required, then simultaneous ignition of multiple lamps is achieved, but the system complexity and cost increase
Solution Approach 1:
The control system is designed with universal timing control capabilities that can simultaneously manage multiple flashlamps using a single integrated controller. The pre-pulse generation circuitry and control logic are multi-functional, allowing precise synchronization of multiple lamps without requiring separate complex control systems for each lamp
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 minimizes electrode stress, allows for precise control of ignition timing, and enables simultaneous operation of multiple lamps, reducing thermal load and extending flashlamp service life while maintaining energy efficiency.
Implementation Method 1
a plasma in the flashlamp is ignited by means of an ignition electrode and is maintained by means of the bias voltage during the pre-pulse
Implementation Method 2
an ignition pulse of the lamp current is effected by generating an ignition voltage effecting an ignition pulse to the ignition electrode
Implementation Method 3
the pre-pulse is generated in that a plasma voltage higher than the bias voltage is applied as electrode voltage and a plasma in the flashlamp is ignited
Data Source
AI summary
A method for flashlamp control, in which a main pulse of the lamp current, producing a flash, is generated, and a pre-pulse of the lamp current is previously generated by application of a bias voltage includes a flashlamp with an ignition electrode, a bias voltage source, a main voltage source and a control system. The load of the flashlamp is minimized during the production of a main pulse by a pre-ignition. A pre-pulse is generated by applying a plasma voltage which is higher than the bias voltage, as an electrode voltage, and igniting a plasma in the flashlamp by means of an ignition electrode and maintaining same by means of the bias voltage during the pre-pulse.