High-Pressure Discharge Lamp Proximity Conductor for Breakdown Voltage Reduction
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Solution Overview
Problem
High-pressure discharge lamps require large transformers and high-voltage resistant components, limiting miniaturization and increasing costs, and generate noise that causes operational errors in electronic circuitry due to the high-voltage pulses needed to initiate discharge.
Innovation Solution
A high-pressure discharge lamp design with a proximity conductor formed from a lead wire wound around the bulb and sealing parts, using a high-frequency voltage to initiate discharge, reducing the high-voltage pulse and noise, allowing for smaller transformers and lower voltage-resistant components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-voltage pulse is applied to initiate discharge in a high-pressure discharge lamp, then the discharge can be successfully initiated, but the transformer size and high-voltage resistant components increase, limiting miniaturization and increasing costs
Solution Approach 1:
The patent introduces a proximity conductor as an intermediary element positioned near the bulb. This conductor creates an external electric field that assists in initiating the discharge, allowing the use of a smaller transformer while still achieving reliable discharge initiation. The proximity conductor acts as a mediator between the power supply and the lamp plasma.
Solution Approach 2:
The patent changes the electrical field distribution parameters by introducing the proximity conductor at specific positions around the bulb. This modifies the electric field intensity and distribution, enabling discharge initiation with lower voltage requirements and reducing the transformer size needed.
2Reliability
If a high-voltage pulse is applied to initiate discharge, then the lamp can start, but noise is generated that causes operational errors and failure in the lighting device and surrounding electronic circuitry
Solution Approach 1:
The proximity conductor serves as an intermediary that enables discharge initiation through a different mechanism, reducing the need for extreme high-voltage pulses. By creating an assisted electric field, it allows for softer switching that generates less electromagnetic noise and interference with surrounding electronics.
3Reliability
If a proximity conductor is mounted to the outside of the bulb to decrease breakdown voltage, then the high-voltage pulse height can be decreased, but a fairly large transformer and high-voltage resistant electronic components are still required
Solution Approach 1:
The patent optimizes the parameters of the proximity conductor including its position, shape, and electrical properties to maximize its effect on the electric field distribution. By carefully tuning these parameters, the system achieves sufficient discharge initiation assistance with a smaller transformer, reducing overall device complexity.
Solution Approach 2:
The patent considers the dynamic interaction between the proximity conductor, the electric field, and the plasma formation process. The conductor's configuration is designed to work dynamically with the switching process, adapting to the changing electrical conditions during discharge initiation.
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
The solution effectively reduces the high-voltage pulse, enabling miniaturization, cost savings, and noise reduction, thereby eliminating operational errors in electronic circuitry and improving lighting efficiency.
Implementation Method 1
a high-frequency voltage is applied to the electrode pair, thereby a high-frequency electric field is generated within the discharge space
Implementation Method 2
electric fields are generated between electrode 504 and electrode 505, wound portion 521, and lead portion 522, respectively, due to the application of the high-voltage pulse between electrodes 504 and 505
Implementation Method 3
This concentrated electric field enables the discharge to be initiated with a relatively low high-voltage pulse
Data Source
AI summary
In a high-pressure discharge lamp that includes a bulb formed from a light emitting part having a discharge space therein and a pair of sealing parts connected to the light emitting part, and an electrode pair disposed within the discharge space, a section of a proximity conductor is wound substantially spirally around one of the sealing parts within a predetermined range from the light emitting part, while the remaining section of the proximity conductor crosses over the light emitting part and is electrically connected to the electrode nearer the other sealing part. By initiating a discharge after applying a high-frequency voltage of 1 kHz to 1 MHz to a high-pressure mercury lamp having this structure, the breakdown voltage can be suppressed to at least 8 kV.