A Dimming Method for Electrodeless Fluorescent Lamp Using a Dual Frequency Square Wave Pulse Signal Generator to Control the Duty Cycle

Abstract

The invention provides a method for dimming an electrodeless fluorescent lamp using a dual-frequency square wave pulse signal generator to control the duty cycle. This method does not change the operating frequency of the inverter and avoids the stroboscopic effect caused by signal modulation. The inverter The integrated circuit (IC) is driven by the square wave pulse signal F1 and receives the input square wave pulse signal F2 with controllable pulse width, the square wave pulse signal F1 and the square wave pulse signal F2, the square wave pulse signal F1 and the square wave pulse There is a microsecond level between the signals F2, and the square wave signal F1‑1 supplies power to the electrodeless fluorescent lamp; adjusting the square wave pulse signal F2 means adjusting the duty cycle of the output square wave signal F1‑1. The invention can maintain the flicker-free advantage of the electrodeless fluorescent lamp and is suitable for application requirements in various occasions. By applying the technology of the invention, the ballast has low temperature rise, reliable operation, long life and wide dimming range, and can make the electrodeless fluorescent lamp The ballast works under the best condition of network matching, which is an ideal dimming method for electrodeless fluorescent lamps.

Description

technical field [0001] The invention relates to a dimming method for an electrodeless fluorescent lamp using a dual-frequency square wave pulse signal generator to control the duty ratio. Background technique [0002] Electrodeless fluorescent lamp is a high-tech new light source integrating the latest electronic power-saving technology and electric light source technology. It does not use filament, but uses magnetic field to stimulate gas discharge and light emission. It has high efficiency, energy saving, no flicker, green environmental protection, long life, etc. Advantages, it has been widely used in the field of indoor and outdoor lighting in recent years. [0003] Due to energy-saving requirements in practical applications, for example, road lighting, tunnel lighting, and classroom lighting require electrodeless fluorescent lamps to have a dimming function. [0004] There are three technologies to meet the above dimming requirements: [0005] 1. Voltage regulation me...

AI Technical Summary

Problems solved by technology

[0009] 1. Voltage regulation method: reducing the DC power supply voltage of the inverter power device can achieve the purpose of dimming, but if the DC voltage is too low, the inverter will stop vibrating, turn off the lights, and the dimming range is small

[0010] 2. Frequency modulation method: the inverter operating frequency is changed. When the operating frequency deviates a lot from the resonance peak point of the output network, it will also cause the lights to be turned off. Due to the mismatch between the operating frequency and the output network, the power consumption of the inverter will increase. The temperature of the ballast rises, reducing the life of the system, and the dimming range is small

After applying this technology, the flicker-free advantage of electrodeless fluorescent lamps is weakened, and it cannot be widely used in lighting environments with high requirements. It cannot be called duty ratio dimming in the true sense.

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