Device for detecting failure in driving power supply for elevator, and method for detecting failure in driving power supply for elevator

• US 7,497,304 B2
• Filed: 05/27/2004
• Issued: 03/03/2009
• Est. Priority Date: 05/27/2004
• Status: Expired due to Fees

• Current Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Original Assignee: Mitsubishi Denki Kabushiki Kaisha (Mitsubishi Electric Corporation)
• Inventors: Matsuoka, Tatsuo
• Primary Examiner(s): SALATA, ANTHONY J
• Application Number:
  US10/578,247
• Publication Number:
  US 20070131488A1
• Time in Patent Office: 1,741 Days
• Field of Search: 187/290, 187/293, 187/296, 187/297, 187391-393, 318/375, 318/376, 318/139, 307/66, 307/69, 320/128, 320130-133, 320/135, 361/23, 361/31, 361/33
• US Class Current: 187/393
• CPC Class Codes: B66B 5/0031 for safety reasons

Abstract

In a feeder circuit for operating a safety device of an elevator, a charging capacitor for actuating an actuator through discharge is employed. A failure detecting device for detecting the presence or absence of a capacitance shortage of a charging capacitor is also electrically connected to the feeder circuit. The failure detecting device has a memory in which a lower limit and upper limit of a charging time at the time when the charging capacitor is in normal operation are stored, and a CPU which is capable of measuring the charging time of the charging capacitor and detects whether or not the charging time is between the lower limit and the upper limit. When the charging time is between the lower limit and the upper limit, the CPU determines that there is no capacitance shortage of the charging capacitor.

Claims

1. A failure detecting device for an elevator drive power source for detecting whether or not there is an abnormality in a charging capacitance of a charge portion serving as a drive power source that drives an actuator for operating a safety device of an elevator, characterized by comprising:

a determination device comprising;

a storage portion in which an upper limit and a lower limit of a charging time of the charge portion at a time when the charging capacitance is normal are stored in advance; and

a processing portion which can measure the charging time of the charge portion, for detecting whether or not the charging time is between the upper limit and the lower limit.

2. A failure detecting method for an elevator drive power source for detecting whether or not there is an abnormality in a charging capacitance of a charge portion serving as a drive power source that drives an actuator for operating a safety device of an elevator, characterized by comprising the steps of:

measuring a charging period of time until a charging voltage of the charge portion becomes equal to a set voltage when charging the charge portion, by means of a processing portion; and

detecting whether or not the charging time is within a predetermined set range, by means of the processing portion.