Improved choke circuit, and bus power supply incorporating same

摘要

The invention relates to a choke circuit (220) and a bus power supply incorporating same. Such a coil choke circuit (220) includes an inductor (L11) connected between a first input terminal (29V) and a first output terminal (Bus+), a boost circuit (222) connected between a second input terminal (0V) and a second output terminal (Bus-) for increasing the voltage level that is output by the second output terminal (Bus-). A switching element (T12) is connected in parallel to the boost circuit (222) for bypassing the boost circuit (222). Additionally, a comparator (CMP) is connected between the first input terminal (29V) and the first output terminal (Bus+) for detecting a potential difference across the inductor (L11); wherein in case the comparator (CMP) detects a potential difference higher than a threshold, the switching element (T12) is controlled to be in an OFF state; and in case the comparator (CMP) detects a potential difference lower than or equal to the threshold, the switching element (T12) is controlled to be in an ON state.