Electronic circuit

摘要

The invention provides an electronic circuit capable of reducing surge voltage while reducing switching loss when a MOSFET is turned off. A capacitor (91) is connected between apart closer to a first power source terminal (31) of a U-phase module (3) in a bus bar (61a) and a part closer to a second power source terminal (32) of the U-phase module (3) in a bus bar (64a). A capacitor (92) is connected between apart closer to a first power source terminal (41) of a V-phase module (4) in a bus bar (62) and a part closer to a second power source terminal (42) of the V-phase module (4) in a bus bar (65). A capacitor (93) is connected between a part closer to a first power source terminal (51) of a W-phase module (5) in a bus bar (63) and a part closer to a second power source terminal (52) of the W-phase module (5) in a bus bar (66).

主权项

1. An electronic circuit having a plurality of series circuits each of which has two metal-oxide semiconductor field-effect transistors (MOSFETs) connected in series, a first power supply terminal being connected to one end of each of the series circuits, a second power supply terminal being connected to an opposite end of each of the series circuits, the electronic circuit comprising:
a first bus bar, one end of which is connected to each of the first power supply terminals; a first external electric wire comprising the first bus bar, the first external electric wire connecting the first power supply terminals to one terminal of a power source; a second bus bar, one end of which is connected to each of the second power supply terminals; a second external electric wire comprising the second bus bar, the second external electric wire connecting the second power supply terminals to an opposite terminal of the power source; and a snubber circuit that suppresses surge voltage, the snubber circuit being provided in each of the series circuits and connected between the first bus bar connected to the series circuits through the first power supply terminal and the second bus bar connected to the series circuits through the second power supply terminal, wherein each of the snubber circuits includes a capacitor, one end of each of the snubber circuits is connected to a part of the first bus bar closer to the corresponding first power supply terminal, and an opposite end of each of the snubber circuits is connected to a part of the second bus bar closer to the corresponding second power supply terminal.