Zero-Voltage Switch Technology And Simulation Analysis In Power Of Electrodeless Fluorescent Lamp

As a new-type light, Electrodeless Fluorescent Lamp (EFL) has lots of advantages, such as high luminous efficiency, long life-cycle, energy conservation etc. It has been applied in the field of plaza, workshop and road lighting ect. But the lamp still has some problems, such as the decline of stability and conversion efficiency of the lamp electronic ballast. Therefore, the impacts of discrete device parameters are researched for Zero-voltage Switch (ZVS) conditions of MOSFET, The optimal combination devices are studied to improve conversion efficiency of the ballast.There are various of power loss in lamp electronic ballast, such as hard switching state of switching loss in the inverter circuit, which affects the efficiency of the ballast directly. The followings are the main work of this research:Firstly, circuit of lamp ballast such as the principle of EMI filter, power factor correction and high-frequency inverter were designed in the article, which drove the switching device and established the experimental platform. Secondly, the inverter circuit's operation mode in switch condition was analyzed to get the corresponding state equation, and the inverter circuit was modeled by using state space average method.Thirdly, the relationship of waveform phase between the input and output of switch tube is available for realizing ZVS in resonant condition through simulation in the time domain. Then, the transfer function of the model was analyzed in frequency domain to get the phase margin,which is the stability of the circuit, the result is that the stability of order is coupling capacitance, resistance, inductance and output capacitance. Fourthly, the response curve of the resonant circuit was measured to determine the influence of frequency and power when the parameters are discrete, then the model is validated. Under the circumstance of the ballast working frequency is larger than 2.58 MHz, it can realize ZVS of inductive load. Orthogonal experiment method was used to measure the surface temperature of MOSFET when the parameters are discrete, the optimal level combination of loss minimum was obtained.Under the optimal level combination, the stability of working frequency, input and output power were improved significantly. The input and output power were measured by the power meter and digital oscilloscope, It was concluded that EFL ballast conversion efficiency reached 65.3%.