Title:
LOAD DRIVING DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/220716
Kind Code:
A1
Abstract:
In past methods, at least one cycle of diagnostic time was required in order to detect pulses, and a problem was presented in that the diagnostic time was long. This load driving device is provided with a drive-side switching element, a synchronization rectifier circuit having a reflux-side switching element, a driver control circuit for controlling the synchronization rectifier circuit, and a voltage monitor circuit for monitoring whether or not the voltage of an output terminal of the synchronization rectifier circuit is within a prescribed voltage range. When a diagnosis command is received, the driver control circuit performs control so that, when the drive-side switching element is switched from ON to OFF, the reflux-side switching element also turns OFF. In a period during which the drive-side switching element and the reflux-side switching element are both OFF, the voltage monitor circuit detects a normal state when the voltage being monitored is at a normal level.
Inventors:
OHARA YURI (JP)
SUGIYAMA YASUSHI (JP)
YAMASHITA TAKEO (JP)
DOI MASAHIRO (JP)
SUGIYAMA YASUSHI (JP)
YAMASHITA TAKEO (JP)
DOI MASAHIRO (JP)
Application Number:
PCT/JP2019/005219
Publication Date:
November 21, 2019
Filing Date:
February 14, 2019
Export Citation:
Assignee:
HITACHI AUTOMOTIVE SYSTEMS LTD (JP)
International Classes:
G01R31/34; G01R31/50; H02H3/00; H02M7/21; H02P7/29
Foreign References:
| JPH0875811A | 1996-03-22 | |||
| JP2011053175A | 2011-03-17 | |||
| JP2014239571A | 2014-12-18 | |||
| JP2012222855A | 2012-11-12 | |||
| JP2013236483A | 2013-11-21 | |||
| JP2012143048A | 2012-07-26 | |||
| US20140340095A1 | 2014-11-20 |
Attorney, Agent or Firm:
TODA Yuji (JP)
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