CHOKE CIRCUIT, AND BUS POWER SUPPLY INCORPORATING SAME

摘要

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

主权项

1. A choke circuit (220) for providing an input voltage supplied by a DC power supply (110) to at least one bus node (130), comprising:
two input terminals (DC+, DC−) for receiving the input voltage supplied by the DC power supply (210); two output terminals (Bus+, Bus−) for outputting a voltage based on the input voltage to the at least one bus node (230); an inductor (L11) connected between a first input terminal (DC+) and a first output terminal (Bus+); a boost circuit (222) connected between the second input terminal (DC−) and the second output terminal (Bus−) for increasing the voltage level that is output by the second output terminal (Bus−); a switching element (T12) connected in parallel to the boost circuit (222) for bypassing the boost circuit (222) interposed between the second input terminal (DC−) and the second output terminal (Bus−); a comparator (CMP) connected between the first input terminal (DC+) 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 such that a voltage level, increased by the boost circuit (222), is output by the second output terminal (Bus−); 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 such that the boost circuit (222) is bypassed and a voltage level, corresponding to the input voltage, is output by the second output terminal (Bus−).