Title:
低電力制御装置を用いたブレーキの安全な制御
Document Type and Number:
Japanese Patent JP2011524319
Kind Code:
A
Abstract:
A control circuit selectively energizes a load, such as an elevator or escalator brake (12). The circuit includes a transformer (28) with a primary-winding connected to a series with a semiconductor switch (40) that is driven by a pulse width modulation (PWM) controller. Power to the PWM controller is supplied through safety relay contacts (52A, 52B). When the load is to be energized, the safety relay contacts are closed and the PWM controller drives the semiconductor switch to supply energy through the transformer to the secondary circuit. A command signal to secondary circuitry (64) causes power in the secondary to be applied to the load (12). If the safety relay contacts open, the PWM controller turns off and power is no longer delivered to the secondary circuit and the load.
More Like This:
Inventors:
Gewner, Jurgen
Damelaw, Marvin
Damelaw, Marvin
Application Number:
JP2011514550A
Publication Date:
September 01, 2011
Filing Date:
June 17, 2008
Export Citation:
Assignee:
OTIS ELEVATOR COMPANY
International Classes:
B66B1/30; B66B1/34
Domestic Patent References:
| JP2002315351A | 2002-10-25 | |||
| JP2003235258A | 2003-08-22 | |||
| JPH0654376A | 1994-02-25 | |||
| JPH03503592A | 1991-08-08 | |||
| JP2000509357A | 2000-07-25 |
Foreign References:
| EP1225150A1 | 2002-07-24 |
Attorney, Agent or Firm:
Tsuyoshi Hashimoto
Tomioka Kiyoshi
Tomioka Kiyoshi