POWER CONVERSION CIRCUIT

摘要

A power conversion circuit includes first to fourth switching elements connected in series between grand and high voltage electrical paths, a first reactor, a main battery, a second reactor, a sub battery, a high voltage sensor for detecting a high voltage VH between the grand and high voltage electrical paths, and a controller. Upon issuance of an instruction for turning off all of the first to fourth switching elements, the controller determines that the third switching element is experiencing an ON failure when the high voltage VH is equal to the sum of a battery voltage VB1 of the main battery and a battery voltage VB2 of the sub battery, to thereby allow electrical power to be transferred between the batteries and a load even in the event of occurrence of the ON failure in the switching element.

主权项

1. A power conversion circuit comprising:
a grand electrical path and a high voltage electrical path that output electrical power to a load; first, second, third, and fourth switching elements that are serially connected in that order from the high voltage electrical path toward the grand electrical path; first, second, third, and fourth diodes that are respectively connected in anti-parallel to the switching elements; a first electrical path that connects a second junction point between the second and third switching elements to the grand electrical path; a first reactor and a first direct current power supply connected in series on the first electrical path; a second electrical path that connects a first junction point between the first and second switching elements to a third junction point between the third and fourth switching elements; a second reactor and a second direct current power supply connected in series on the second electrical path; a voltage sensor that detects a voltage between the grand and high voltage electrical paths, and a controller that includes a CPU to turn on and off each of the switching elements, wherein; the controller causes the CPU to perform, upon issuance of an instruction for turning off all of the first to fourth switching elements, a failure determination program for determining that the third switching element is experiencing an ON failure when the voltage between the grand and high voltage electrical paths detected by the voltage sensor is equal to the sum of voltages of the first and second direct current power sources.