Invention Grant
US09042126B2 Switching power converting apparatus, switching controller for the same, and method of controlling a bipolar junction transistor of the same 有权
开关电源转换装置,其开关控制器及其控制双极结型晶体管的方法

Switching power converting apparatus, switching controller for the same, and method of controlling a bipolar junction transistor of the same
Abstract:
A switching power converting apparatus includes a coil unit, a bipolar junction transistor (BJT) controlling power transfer through the coil unit, and a current sensing resistor sensing a current flowing through the BJT so as to produce a sensed voltage thereacross. A switching controller includes a current source supplying a first current, a current generating module generating, based on an input voltage associated with the sensed voltage, a second current, which is proportional to the current flowing through the BJT, a multiplexing module selecting one of the first and second currents as an output current, and a driving module outputting, based on the output current, a driving current, which is proportional to the output current, to the BJT to thereby conduct the BJT.
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