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中文摘要：
提出一种新颖的开关DC-DC变换器调制方法：双频率脉冲序列调制（bi-frequency pulse train modulation,BF-PTM）方法。BF-PTM通过对两组频率不同、但导通时间相同的控制脉冲进行调制,实现开关变换器输出电压的调节。BF-PTM适用于各种开关变换器拓扑。以电感电流断续模式（discontinuous conduction mode,DCM）Buck变换器为例,分析BF-PTM开关变换器的工作原理及控制特性,并进行相应的仿真及实验研究。研究结果表明,BF-PTM控制开关变换器具有优于PWM开关变换器的瞬态响应和电磁干扰特性。
英文摘要：
A novel modulation method,bi-frequency pulse train modulation（BF-PTM）,for switching DC-DC converters was proposed.BF-PTM realizes the output voltage regulation of switching DC-DC converters by the modulation of two control pulses with the same turn-on time but different frequencies.BF-PTM is applicable to the control of various switching DC-DC converters.The operation principle and control characteristics of BF-PTM controlled switching DC-DC converters were analyzed with a Buck converter operating in discontinuous conduction mode（DCM） as an example.Simulation and experiment results indicate that BF-PTM controlled switching converter has superior characteristics on transient response and electromagnetic interference（EMI） to conventional PWM controlled switching converter.
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