PROBLEM TO BE SOLVED: To cut off an overcurrent independently of a current flowing direction to protect a MOSFET.SOLUTION: An overcurrent cutoff system (90) comprises: a first MOSFET (3a); a second MOSFET (3b); a current value detector (5) that detects a value of a current flowing in the first MOSFET (3a) and the second MOSFET (3b); and a controller (6) that can control the first MOSFET (3a) and the second MOSFET (3b). A forward direction of a parasitic diode (31a) is reverse to a forward direction of a parasitic diode (31b). The controller (6), when it is determined that an overcurrent flows in the first MOSFET (3a) and the second MOSFET (3b) on the basis of the current detected by the current value detector (5), at least turns off the MOSFET having a parasitic diode in a reverse direction to the overcurrent, among the first MOSFET (3a) and the second MOSFET (3b), and thereby, cuts off the overcurrent.SELECTED DRAWING: Figure 1
【課題】電流が流れる方向にかかわらず過電流を遮断しMOSFETを保護する。【解決手段】過電流遮断システム(90)は、第1のMOSFET(3a)と、第2のMOSFET(3b)と、第1のMOSFET(3a)及び第2のMOSFET(3b)を流れる電流の値を検出する電流値検出部(5)と、第1のMOSFET(3a)と第2のMOSFET(3b)とを制御可能な制御部(6)とを有し、寄生ダイオード(31a)の順方向は寄生ダイオード(31b)の順方向とは逆方向であり、制御部(6)は、電流値検出部(5)によって検出された電流に基づいて、第1のMOSFET(3a)及び第2のMOSFET(3b)に過電流が流れていると判定したとき、第1のMOSFET(3a)と第2のMOSFET(3b)とのうち、過電流に対し逆方向である寄生ダイオードを有する方のMOSFETを少なくともオフにして過電流を遮断する。【選択図】図1
OVERCURRENT CUTOFF SYSTEM
過電流遮断システム
2018-01-18
Patent
Electronic Resource
Japanese
IPC: | H02H EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS , Schutzschaltungsanordnungen / H02J CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER , Schaltungsanordnungen oder Systeme für die Abgabe oder Verteilung elektrischer Leistung / B60R Fahrzeuge, Fahrzeugausstattung oder Fahrzeugteile, soweit nicht anderweitig vorgesehen , VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR |
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