Title:
SAFETY DEVICE OF ELEVATOR
Document Type and Number:
Japanese Patent JP2010064802
Kind Code:
A
Abstract:
To provide a safety device in which an abnormal high voltage is hardly applied to the safety coil of a safety relay even if a power supply source fails.
This safety device of an elevator includes a transistor 63 for driving the safety coil 61L through the contacts 21a, 23a, 25a, 27a of the safety switch for running the car of the elevator, a current detector 55 for generating a current detection signal by detecting a current flowing through the safety coil, and in an output from a power source, a PWM chopper circuit 53 for controlling the current flowing in the safety coil in such a manner that the current detection signal matches a current instruction signal.
Inventors:
KUBOTA TAKEHIKO
Application Number:
JP2008229724A
Publication Date:
March 25, 2010
Filing Date:
September 08, 2008
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP
International Classes:
B66B5/00; B66B1/34
Attorney, Agent or Firm:
Shogo Takahashi
Tadahiko Inaba
Kanako Murakami
Nakatsuru Kazutaka
Tadahiko Inaba
Kanako Murakami
Nakatsuru Kazutaka
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