Title:
スイッチの駆動回路
Document Type and Number:
Japanese Patent JP7283334
Kind Code:
B2
Abstract:
To provide a drive circuit for a switch capable of quickly determining that an overcurrent is flowing while preventing an erroneous determination that the overcurrent is flowing even when the turn-on speed of the switch varies.SOLUTION: A drive circuit Dr has a switch SW as a drive target, and includes a diode 40 and a capacitor 44. The drive circuit Dr starts supplying current from a constant current power supply 42 to the capacitor 44 at the timing when a filter time elapses from the start of charging a gate of the switch SW. The drive circuit Dr includes a drive control part 50 which determines that an overcurrent is flowing in the switch SW when a voltage Vdeast of the capacitor 44 with the switch SW in a turned-on state exceeds an overcurrent threshold value Vα. The drive control part 50 sets the filter time to be shorter when the turn-on speed is high than when the turn-on speed of the switch SW is low.SELECTED DRAWING: Figure 2
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| JP2004140977 | GATE DRIVE CIRCUIT |
Inventors:
Watanabe Kazunori
Application Number:
JP2019178832A
Publication Date:
May 30, 2023
Filing Date:
September 30, 2019
Export Citation:
Assignee:
株式会社デンソー
International Classes:
H02M1/08; H02M1/00; H02M7/48; H03K17/082
Domestic Patent References:
| JP2017224999A | ||||
| JP2004222367A | ||||
| JP2014207620A | ||||
| JP2014023342A |
Attorney, Agent or Firm:
Tsuyoshi Yamada
Kyoko Hino
Hiroshi Matsuda
Yusuke Kita
Kyoko Hino
Hiroshi Matsuda
Yusuke Kita