公开(公告)号：US20150244269A1

公开(公告)日：2015-08-27

申请号：US14631388

申请日：2015-02-25

Applicant: TEXAS INSTRUMENTS INCORPORATED

Inventor： Theodore Ernest YU ,  Ali MOTAMEDI ,  Dingkun DU ,  Sombuddha CHAKRABORTY ,  Patrick TETERUD ,  Keith Thomas SANDERS, JR.

IPC: H02M3/156

CPC classification number: H02M3/156 ,  H02M1/44 ,  H02M2001/0012

Abstract: In described examples, a switching mode power supply includes an output filter, a driver, a pulse width modulator, and pulse adaptation circuitry. The output filter is configured to provide output of the switching mode power supply. The driver is coupled to the output filter and is configured to switch current to the output filter. The pulse width modulator is configured to generate pulses that control switching of current by the driver. The pulse width modulator includes spread spectrum logic configured to randomize timing of the pulses generated by the pulse width modulator. The pulse adaptation circuitry is configured to identify an instantaneous excursion of the output of the switching mode power supply beyond a predetermined threshold, and to modify the randomized timing of the pulses produced by the pulse width modulator based on the identified instantaneous excursion.

Abstract translation: 在所述示例中，开关模式电源包括输出滤波器，驱动器，脉宽调制器和脉冲适配电路。 输出滤波器配置为提供开关模式电源的输出。 驱动器耦合到输出滤波器，并配置为将电流切换到输出滤波器。 脉冲宽度调制器被配置为产生控制驱动器的电流切换的脉冲。 脉冲宽度调制器包括扩展频谱逻辑，其配置成使由脉冲宽度调制器产生的脉冲的定时随机化。 脉冲适配电路被配置为识别开关模式电源的输出超出预定阈值的瞬时偏移，并且基于所识别的瞬时偏移来修改由脉宽调制器产生的脉冲的随机定时。