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SWITCHING POWER CONVERTER CONTROL WITH SPREAD SPECTRUM BASED ELECTROMAGNETIC INTERFERENCE REDUCTION
SWITCHING POWER CONVERTER CONTROL WITH SPREAD SPECTRUM BASED ELECTROMAGNETIC INTERFERENCE REDUCTION
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机译:基于扩频电磁干扰的开关电源转换器控制
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摘要
Power control systems generate electromagnetic interference (EMI). In at least one embodiment, a power control system includes a switching power converter and a controller that utilizes a spread spectrum strategy to reduce peak EMI values of the power control system. The controller generates a power regulation, switch control signal to control an input voltage to output voltage conversion by the switching power converter. The controller modulates the period of the control signal in accordance with the spread spectrum strategy. The spread spectrum strategy is an intentional plan to spread the spectrum of the control signal to reduce peak EMI values, and, thus, reduce the potential for degradation in performance, a malfunction, or failure of an electronic circuit caused by the EMI. The controller also modulates a pulse width of the switch control signal in response to modulation of the period of the control signal to provide power factor correction.
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