| 摘要 |
<p>Disclosed is a photoelectric switch for an elevator, which comprises infrared transmitting and receiving integrated circuits (1) connected in sequence. An output end of each infrared transmitting and receiving integrated circuit (1) is connected with a light emitting diode (LED) through a triode (2). A base of the triode (2) is also connected with an overcurrent short-circuit protection integrated circuit (3). The photoelectric switch for an elevator has the functions of load overcurrent short-circuit protection and elimination of external interference signals.</p> |
