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Synchronous Sensing Of Inductor Current In A Buck Converter Control Circuit
Synchronous Sensing Of Inductor Current In A Buck Converter Control Circuit
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机译:降压转换器控制电路中电感电流的同步检测
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摘要
A sense resistor is placed in series with an output capacitor of a buck converter. The buck converter operates in a discontinuous mode such that there is a dead time in each switching cycle. A control circuit senses a voltage across the sense resistor and thereby generates a first signal ICS. The control circuit detects an offset voltage in ICS, where the offset voltage is the voltage of ICS during the dead time in a first switching cycle. The control circuit level shifts the entire ICS by the offset voltage, thereby generating a second signal ICLS. ICLS has the same waveform as the waveform of the inductor current. In a second cycle, ICLS is used to determine when to turn off the main switch and when the start of the dead time occurs. ICLS and the offset voltage are used together to determine when to turn the main switch on.
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机译:感测电阻器与降压转换器的输出电容器串联放置。降压转换器以不连续模式工作,因此每个开关周期中都有一个死区时间。控制电路感测感测电阻器两端的电压,从而生成第一信号I CS Sub>。控制电路检测I CS Sub>中的偏移电压,其中,偏移电压是在第一个开关周期中的空载时间内I CS Sub>的电压。控制电路通过偏移电压将整个I CS Sub>移位,从而生成第二个信号I CLS Sub>。 I CLS Sub>的波形与电感器电流的波形相同。在第二个周期中,I CLS Sub>用于确定何时关闭主开关以及何时发生空载时间。 I CLS Sub>和偏移电压一起用于确定何时打开主开关。
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