Gas Light System With Digitally Controlled Ballast
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Solution Overview
Problem
Existing neon and ionized gas lighting systems lack the ability to produce a consistent 'write effect' and blinking functionality, with previous attempts resulting in erratic performance.
Innovation Solution
A gas light system with a gas tube having a first and second cathode, an isolated conductor, and a digitally controlled ballast that adjusts energy through pulse width modulation, allowing for precise control of impedance and lighting effects, including a consistent write and un-write function.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single cathode gas tube with natural ground is used, then the system is simple, but the write effect is erratic and inconsistent
Solution Approach 1:
The gas tube is divided into two separate cathodes (first cathode and second cathode) instead of using a single cathode with natural ground. This segmentation allows independent control of each cathode through the ballast, enabling precise control over the write effect progression and consistency.
Solution Approach 2:
An isolated conductor is introduced as an intermediary element running along the gas tube and electrically attached to the second cathode. This isolated conductor provides a controlled impedance path that mediates the electrical connection, ensuring consistent write effect while maintaining system manageability.
2Ease of manufacture
If analog energy control is used, then the system is simple to implement, but the input energy precision is insufficient
Solution Approach 1:
The analog energy control system is replaced with a digitally controlled ballast that uses pulse width modulation (PWM) at 20 KHz. This substitution of digital control for analog control provides precise energy adjustment through duty cycle variation while maintaining ease of implementation through standard digital control techniques.
Solution Approach 2:
The ballast uses periodic pulse width modulated signals at 20 KHz to control energy delivery to the gas tube. By varying the duty cycle of these periodic pulses, precise energy control is achieved while the high frequency ensures smooth operation and eliminates audible noise.
3Device complexity
If fixed energy output is used, then the system is simple, but the lighting effect flexibility is limited
Solution Approach 1:
The ballast is designed with dynamic energy adjustment capability, allowing the output energy to be varied in real-time. The system can adjust the amplitude and duty cycle of the PWM signal to produce different lighting effects including write effect, un-write effect, and blinking patterns, providing versatility without excessive complexity.
Solution Approach 2:
The system achieves lighting effect flexibility by changing key parameters of the output signal: duty cycle of the PWM signal controls energy delivery timing, and amplitude controls the voltage level. By dynamically adjusting these parameters, multiple lighting effects are achieved from a single control system.
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 system achieves a reliable and consistent write effect, along with blinking capabilities, by providing accurate energy control and flexible energy adjustment, enhancing the functionality of neon and ionized gas lighting systems.
Implementation Method 1
The gas discharge ballast has an output applied to the gas tube whose energy can be adjusted. In one embodiment, the energy is adjusted by changing the duty cycle of a 20 KHz pulse width modulated signal.
Implementation Method 2
Gas light system and method... Neon lights and other ionized gas lighting systems have been used for years... Gas discharge ballast has an output applied to the gas tube
Data Source
AI summary
A writing gas light system has a gas tube with a first end and a second end. A first cathode is attached to a first end of the gas tube and a second cathode is attached to a second end of the gas tube. An isolated conductor runs along a length of the gas tube and is electrically attached to the second cathode. A light ballast is coupled to the first cathode and to the isolated conductor. In one embodiment, the system has a digitally controlled ballast. The gas discharge ballast has an output applied to the gas tube whose energy can be adjusted. The system has a balanced center tap transformer. The secondary of the transformer is tied to ground through a ground fault detection circuit.