基于脉宽调制的软开关等离子扬声器

为实现等离子扬声器低功耗与产品化, 在理论分析基础上, 结合零电压开关(ZVS: Zero Voltage Switch) 和脉宽调制(PWM: Pulse-Width Modulation)两种方案的优点, 提出了一种基于 PWM 脉宽调制的软开关控制方 式。 驱动电路采用 IR2110 芯片增强电路的驱动能力, 开关部分则采用软开关的方式提高了电路的整体效率。 通过对比分析电源输入功率、 开关管发热情况和电弧长度后发现, 该方案在电弧长度为 1. 5 cm 的情况下电源 输出功率为12 W, 两开关管的表面温度分别为50℃和58℃。 实验结果表明, 该方案降低了功耗, 提高了整体 电路的稳定性和安全性, 同时降低了控制开关管的 PWM 波的失真度, 因而具有更优秀的实际应用与产品化 能力。

Soft Switch Plasma Loudspeaker Based on Pulse-Width Modulation

For the purpose of reducing power and improving production capacity of plasma loudspeaker,based on the theoretical analysis, we analyze the characteristics and principles of the two typical methods, ZVS(Zero Voltage Switch)and PWM(Pulse-Width Modulation),combining the advantages of the two schemes,propose a soft switch control method based on PWM pulse width modulation.The driving circuit adopts IR2110 chip to enhance the driving ability of the circuit.The switch part adopts the soft switch method to improve the overall efficiency of the circuit.By comparing the power input,the switching tube heating condition and the arc length, it is found that the output power is 12 W when the arc length is 1.5 cm, the surface temperature of the two switches are 50 ℃ and 58 ℃.The experimental results show that the proposed scheme reduces the power consumption,improves the stability and safety of the overall circuit,and reduces the distortion of the PWM wave which controls the switch.Therefore,it has better practical application and product capability.