CN220156518U

CN220156518U - Elevator intercom system based on isolation transformer

Info

Publication number: CN220156518U
Application number: CN202321235816.3U
Authority: CN
Inventors: 区金杰; 陈克成; 许珍贵; 黄肇焜; 何广培; 郭衍昭
Original assignee: Guangzhou Lihengsheng Electronics Co ltd
Current assignee: Guangzhou Lihengsheng Electronics Co ltd
Priority date: 2023-05-22
Filing date: 2023-05-22
Publication date: 2023-12-08
Anticipated expiration: 2033-05-22

Abstract

The utility model discloses an elevator intercom system based on an isolation transformer, which comprises two or more sub-machine intercom units, wherein each sub-machine intercom unit comprises a single chip microcomputer, a filter circuit module, a power supply voltage stabilizing circuit module, a DTMF signal output circuit module, a DTMF signal receiving circuit module, an isolation transformer circuit module and a photoelectric coupling isolation circuit module. The system achieves the power supply voltage required by the system through a common power supply circuit, the DTMF signal receiving circuit exchanges information through a fixed protocol, and all the sub-machines are completely isolated by using an isolation transformer, so that the common-mode interference signal is removed to the greatest extent by the electrical signal of the system.

Description

Elevator intercom system based on isolation transformer

Technical Field

The utility model relates to the technical field of electronic circuits, in particular to an elevator intercom system based on an isolation transformer.

Background

At present, most of domestic elevator intercom systems adopt an analog mode to carry out voice signal conversation, for example, chinese patent utility model patent with an authorized bulletin number of CN212893306U discloses an elevator remote intercom device which comprises a controller, a communication module for carrying out conversation with an external telephone and a dual-tone multi-frequency receiver; the voice module is electrically connected with the communication module and the dual-tone multi-frequency receiver; the dual-tone multi-frequency receiver is used for analyzing the dual-tone multi-frequency signal and converting the dual-tone multi-frequency signal into a digital signal to be sent to the controller; the communication module is controlled by the controller to dial and establish communication connection with external telephones. The device can accept the call request of the auxiliary machine, establish the call with the external mobile phone or the base machine, and give an alarm for help in the first time under the condition that the external host machine does not answer, so as to avoid missing the best rescue opportunity, and simultaneously, the device also discloses an elevator remote intercom system.

However, because the field environment of the elevator hoistway is very complex, common mode signal interference is easily introduced into the intercom system, so that the conversation effect of the elevator intercom system is not ideal.

Disclosure of Invention

In order to solve the problems, the utility model provides an elevator intercom system based on an isolation transformer.

The technical scheme adopted for solving the technical problems is as follows: the elevator intercom system based on the isolation transformer comprises two or more sub-intercom units, each sub-intercom unit comprises a single chip microcomputer, a filter circuit module, a power supply voltage stabilizing circuit module, a DTMF (dual tone multi-frequency signal) signal output circuit module, a DTMF signal receiving circuit module, an isolation transformer circuit module and a photoelectric coupling isolation circuit module, wherein the power supply voltage stabilizing circuit module provides stable power supply voltage for the single chip microcomputer, the filter circuit module, the DTMF signal output circuit module, the DTMF signal receiving circuit module, the isolation transformer circuit module and the photoelectric coupling isolation circuit module, the single chip microcomputer is in data connection with the filter circuit module, the DTMF signal output circuit module, the DTMF signal receiving circuit module and the photoelectric coupling isolation circuit module, all the DTMF signal receiving circuit modules are in communication connection through fixed protocols, and all the DTMF signal receiving circuit modules are completely isolated by using the isolation transformer circuit module and the photoelectric coupling isolation circuit module, so that the electrical signal of the system is maximally removed from the common interference signals. The system uses an isolation transformer pushed by a power amplification chip to transmit and receive signals, and the transformer is required to be customized because each sub-machine of the system is matched to smoothly talk. The system is characterized in that an isolation transformer is used for full isolation, so that the system can work normally in a field environment with larger interference.

The beneficial effects of the utility model are as follows: the system achieves the power supply voltage required by the system through a common power supply circuit, the DTMF signal receiving circuit exchanges information through a fixed protocol, and all the sub-machine intercom units are completely isolated by using an isolation transformer, so that the common-mode interference signal is removed to the greatest extent of the electric signal of the system, and the purposes of high cost performance and good intercom sound effect are achieved.

Drawings

FIG. 1 is a system block diagram of the present utility model;

fig. 2 is a circuit diagram of an isolation transformer circuit module of the present utility model.

Detailed Description

The utility model is further described below with reference to the accompanying drawings.

As shown in fig. 1 and fig. 2, an elevator intercom system based on an isolation transformer comprises two or more sub-intercom units, each of the sub-intercom units comprises a single chip microcomputer, a filter circuit module, a power supply voltage stabilizing circuit module, a DTMF (Dual Tone Multi Frequency) signal output circuit module, a DTMF signal receiving circuit module, an isolation transformer circuit module and a photoelectric coupling isolation circuit module, the power supply voltage stabilizing circuit module provides a stable power supply voltage for the single chip microcomputer, the filter circuit module, the DTMF signal output circuit module, the DTMF signal receiving circuit module, the isolation transformer circuit module and the photoelectric coupling isolation circuit module, the single chip microcomputer is in data connection with the filter circuit module, the DTMF signal output circuit module, the DTMF signal receiving circuit module and the photoelectric coupling isolation circuit module, information exchange is carried out between the DTMF signal receiving circuit modules of each sub-intercom unit through a fixed protocol, and the DTMF signal receiving circuit modules are completely isolated by using the isolation transformer circuit module and the photoelectric coupling isolation circuit module, so that the common interference of the system is removed to the greatest extent. The system uses an isolation transformer pushed by a power amplification chip to transmit and receive signals, and the transformer is required to be customized because each sub-machine of the system is matched to smoothly talk. The system is characterized in that an isolation transformer is used for full isolation, so that the system can work normally in a field environment with larger interference.

The foregoing description is only illustrative of the preferred embodiments of the present utility model and is not intended to limit the scope of the utility model, i.e., the utility model is not limited to the specific embodiments described herein, but is to be accorded the full scope of the claims.

Claims

1. The elevator intercom system based on the isolation transformer comprises two or more sub-intercom units and is characterized in that each sub-intercom unit comprises a single chip microcomputer, a filter circuit module, a power supply voltage stabilizing circuit module, a DTMF signal output circuit module, a DTMF signal receiving circuit module, an isolation transformer circuit module and a photoelectric coupling isolation circuit module, the power supply voltage stabilizing circuit module provides stable power supply voltage for the single chip microcomputer, the filter circuit module, the DTMF signal output circuit module, the DTMF signal receiving circuit module, the isolation transformer circuit module and the photoelectric coupling isolation circuit module, the single chip microcomputer is in data connection with the filter circuit module, the DTMF signal output circuit module, the DTMF signal receiving circuit module, the isolation transformer circuit module and the photoelectric coupling isolation circuit module, all the DTMF signal receiving circuit modules are in communication connection, and all the DTMF signal receiving circuit modules are completely isolated by the isolation transformer circuit module and the photoelectric coupling isolation circuit module.