Title:
INSULATION DETECTION DEVICE
Document Type and Number:
WIPO Patent Application WO/2015/111692
Kind Code:
A1
Abstract:
An insulation detection device (11) is provided with: a flying capacitor (C1), which is connected between a positive terminal and a negative terminal of a direct current power supply (B) insulated from a grounding potential section, and which is charged with a charge quantity corresponding to a power supply voltage of the direct current power supply (B); a switch for performing switching between charging and discharging of the flying capacitor (C1); a voltage detection device (15) capable of detecting a charge voltage when the flying capacitor (C1) is charged; and an arithmetic device (15) for detecting a direct current power supply insulation state on the basis of the flying capacitor charge voltage detected by means of the voltage detection device (15). The switch is provided with: a plurality of switches (S1, S2, S3, S4), each of which is provided with a semiconductor relay (50); and a protection element (ZD1 or the like), which is connected in parallel to each semiconductor relay (50) of each of the switches (S1, S2, S3, S4), and which keeps a maximum voltage to be applied to the semiconductor relay at a constant voltage.
Inventors:
KAWAMURA YOSHIHIRO (JP)
Application Number:
PCT/JP2015/051814
Publication Date:
July 30, 2015
Filing Date:
January 23, 2015
Export Citation:
Assignee:
YAZAKI CORP (JP)
International Classes:
G01R31/02; G01R31/36
Foreign References:
| JP2012220470A | 2012-11-12 | |||
| JPS631599Y2 | 1988-01-14 | |||
| JPH05114844A | 1993-05-07 |
Attorney, Agent or Firm:
MIYOSHI, Hidekazu et al. (JP)
Hidekazu Miyoshi (JP)
Hidekazu Miyoshi (JP)
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