FAILURE DETECTOR, POWER CONVERTER, AND FAILURE DETECTION PROGRAM

To provide a failure detector for a magnetic sensor.SOLUTION: A failure detector includes: an acquisition section 210 which acquires each of a first detection value in which a value increases according to an increase in magnetic flux density generated by a first phase current and a second detection value in which a value decreases according to an increase in magnetic flux density generated by the first phase current from a first magnetic sensor and a second magnetic sensor, and acquires each of a third detection value in which a value increases according to an increase in magnetic flux density generated by a second phase current and a fourth detection value in which a value decreases according to an increase in magnetic flux density generated by the second phase current from a third magnetic sensor and a fourth magnetic sensor; an estimation section 220 which estimates a first estimation value for estimating the second phase current by using the first detection value and the second detection value, a second estimation value for estimating the second phase current by using the third detection value, and a third estimation value for estimating the second phase current by using the fourth detection value; and a detection section 230 which detects a failure of either of the third magnetic sensor and the fourth magnetic sensor on the basis of the first estimation value, the second estimation value, and the third estimation value.SELECTED DRAWING: Figure 1 【課題】磁気センサの故障検出装置を提供する。【解決手段】第１相電流により発生する磁束密度の増加に応じて値が増加する第１検出値と第１相電流により発生する磁束密度の増加に応じて値が減少する第２検出値を第１磁気センサと第２磁気センサからそれぞれ取得し、第２相電流により発生する磁束密度の増加に応じて値が増加する第３検出値と第２相電流により発生する磁束密度の増加に応じて値が減少する第４検出値を第３磁気センサと第４磁気センサからそれぞれ取得する取得部２１０と、第１検出値と第２検出値を用いて第２相電流を推定した第１の推定値、第３検出値を用いて第２相電流を推定した第２の推定値、および、第４検出値を用いて第２相電流を推定した第３の推定値を算出する推定部２２０と、第１の推定値、第２の推定値、および、第３の推定値に基づいて、第３磁気センサおよび第４磁気センサのいずれかの故障を検出する検出部２３０とを備えた。【選択図】図１