[24p-1BB-1~16] KS.1 Solid State Quantum Sensor Group

1:30 PM - 2:00 PM JST(4:30 AM - 5:00 AM UTC)

[24p-1BB-1] [INVITED] Precise Current Monitor of Electric Vehicle Battery with Diamond Quantum Sensor

〇Yuji Hatano¹, Junya Tanigawa², Akimichi Nakazono², Takeharu Sekiguchi¹, Yuta Kainuma¹, Hiroshi Abe³, Shinobu Onoda³, Takeshi Ohshima³, Takayuki Iwasaki¹, Mutsuko Hatano^1,3 (1.Tokyo Tech, 2.YAZAKI Corp., 3.QST)

Keywords:

diamond quantum sensor,battery monitor,NV center

A prototype high-precision current sensor for electric vehicles was fabricated using a diamond quantum sensor. The fluorescence intensity of the sensor is integrally fed back to microwave generators to make their frequencies follow the resonance frequencies, and the current is measured as the difference between the two resonance frequencies. The three key points for achieving high accuracy are the measurement of the charging rate by the integral feedback circuit, the parallel arrangement of the two sensors used for differential detection, and the compensation of the transverse magnetic field effect due to residual parallelism error. If the parallelism error is suppressed below ±1°, the common-mode noise rejection ratio in the differential detection can be reduced to 0.01%.