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目前电源技术的发展趋势为高频、高效、高密度化、低压、大电流化和多元化。准谐振模式转换器因其低电磁干扰特性及高效率特性可用于反馈开关模式电源的设计,尤其适用于电视中高频信号的处理,能起到低电流、过电压、过负载保护的功能,并有动态自供电(DSS)、准谐振工作、跳跃周期工作、过压保护、过载及短路保护等优点。采用NCP1207型控制器,以准方波共振模式运行的电视电源,可以降低回扫开关电源的电磁干扰,同时提高其功效,同时本文给出了空载运行模型进行仿真。
The current development trend of power technology for high-frequency, high efficiency, high density, low voltage, high current and diversified. Quasi-resonant mode converter can be used for the design of feedback switch mode power supply due to its low electromagnetic interference and high efficiency. It is especially suitable for the processing of medium and high frequency signals of TV, and it can also function as low current, over voltage and overload protection. Dynamic self-powered (DSS), quasi-resonant work, jump cycle work, over-voltage protection, overload and short-circuit protection. Using NCP1207 controller, the TV power supply operating in quasi-square-wave resonance mode can reduce EMI of the flyback switching power supply and improve its efficiency at the same time. In this paper, the no-load operation model is simulated.