Title:
INDUCTIVE LOAD DRIVE DEVICE, AND WIRE BREAK DETECTION DEVICE FOR INDUCTIVE LOAD DRIVE CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2023/286667
Kind Code:
A1
Abstract:
A drive device and a wire break detection device according to the present invention each comprise: an n-type MOSFET which is connected between an inductive load and a ground; a flyback diode which is connected in parallel with the inductive load; a first Zener diode in which a cathode is connected between a drain of the n-type MOSFET and a parallel connection circuit of the inductive load and the flyback diode, and which breaks down by a surge voltage from the inductive load; and a control circuit which determines that there is a wire break of the flyback diode and stops driving of the n-type MOSFET when the terminal voltage of an anode of the first Zener diode is higher than a set voltage. It is thus possible to deal with the presence or absence of a wire break in a flyback line even when the on/off timing of an inductive load is unknown.
Inventors:
TAKAGI RYOTA (JP)
Application Number:
PCT/JP2022/026803
Publication Date:
January 19, 2023
Filing Date:
July 06, 2022
Export Citation:
Assignee:
HITACHI ASTEMO LTD (JP)
International Classes:
H03K17/00; H02M1/08; H03K17/695
Foreign References:
| JP2000184582A | 2000-06-30 | |||
| JP2007010563A | 2007-01-18 | |||
| JP2011216683A | 2011-10-27 | |||
| JP2003339152A | 2003-11-28 |
Attorney, Agent or Firm:
OGAWA, Moriaki et al. (JP)
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