WO2017031729A1 - 无反馈式通讯转换器及其通讯方法 - Google Patents

无反馈式通讯转换器及其通讯方法 Download PDF

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Publication number
WO2017031729A1
WO2017031729A1 PCT/CN2015/088190 CN2015088190W WO2017031729A1 WO 2017031729 A1 WO2017031729 A1 WO 2017031729A1 CN 2015088190 W CN2015088190 W CN 2015088190W WO 2017031729 A1 WO2017031729 A1 WO 2017031729A1
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Prior art keywords
signal
module
optical signal
receiving
optical
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PCT/CN2015/088190
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English (en)
French (fr)
Inventor
韩安孟
廖子桂
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深圳市思达仪表有限公司
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Priority to PCT/CN2015/088190 priority Critical patent/WO2017031729A1/zh
Publication of WO2017031729A1 publication Critical patent/WO2017031729A1/zh

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    • G—PHYSICS
    • G08—SIGNALLING
    • G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
    • G08C19/00—Electric signal transmission systems

Definitions

  • the invention relates to an electric energy meter adapter, in particular to a feedback-free communication converter and a communication method thereof.
  • infrared meter reading electric energy meters are one type of electric energy meters.
  • the upper computer can establish a wireless communication relationship with the infrared meter reading type electric energy meter through the infrared communication probe.
  • the requirements of the infrared communication head are: cylindrical equipment with an inner diameter of no more than 13mm and an internal maximum space height of not more than 38mm.
  • prior art infrared meter reading meters typically use a feedback RS232-infrared communication converter.
  • the working principle of the feedback RS232-infrared communication converter is: the communication signal sent by the computer is transmitted through the infrared transmitting tube of the RS232-infrared communication converter. If there is an obstacle in front, the transmitted signal will be totally or partially reflected. Back, it is received by the infrared receiver and reversely fed back to the receiving port of the computer through the RS232-infrared communication converter.
  • the feed RS232-infrared communication converter has a big drawback. Sometimes the transmitted signal can not be fully fed back, which brings great inconvenience to the processing of the host computer, and even increases the error rate of the host computer. It affects the wireless communication between the host computer and the infrared meter reading meter.
  • the Chinese patent CN1360387 published on July 24, 2002 discloses a power distribution terminal field maintenance communication system in the power field, the technical solution of which comprises: a first infrared transceiver and a second infrared transceiver: the first The infrared transceiver is installed inside the power distribution terminal, and includes a maintenance port communication mode switching switch, an infrared transmitting unit and an infrared receiving unit; the input end of the infrared transmitting unit and the output end of the infrared receiving unit pass the maintenance
  • the port communication mode changeover switch is respectively connected in series with the output end and the input end of the power distribution terminal maintenance port; the maintenance port communication mode changeover switch can restore the output end and the input end of the power distribution terminal maintenance port to the RS232 output by switching
  • the second infrared transceiver is composed of an infrared transmitting unit, an infrared receiving unit and an RS232 interface; the infrared transmitting unit and the infrared receiving unit are respectively connected in
  • the invention solves the problem that in the prior art, when the wireless signal transmitted by the upper computer through the RS232 infrared communication converter encounters an obstacle, part or all of the feedback to the upper computer receiving port affects the normal operation of the upper computer, A feedback-free communication converter and a communication method thereof.
  • a technical solution adopted by the present invention is to provide a feedback-free communication converter, including a signal interface module, a power circuit module, an electro-optical signal conversion and an optical signal transmission module, a switch control module, and an optical signal receiving. And an optoelectronic signal conversion module, and a fault warning module;
  • the signal interface module includes a signal transmitting end and a signal receiving end, the signal transmitting end is connected to an electro-optical signal conversion and an optical signal transmitting module, and the signal receiving end is connected to an output end of the switch control module;
  • the signal transmitting end is respectively connected to the electro-optical signal conversion and optical signal transmitting module and the controlled end of the switch control module, and the input end of the switch control module is connected to the optical signal receiving and photoelectric signal conversion module, and the output of the switch control module The end is connected to the signal receiving end;
  • the input end of the power circuit module is connected to the signal interface module, and the output end of the power circuit module is respectively connected to the electro-optical signal conversion and optical signal transmitting module and the optical signal receiving and photoelectric signal conversion module;
  • the switch control module includes a second diode, a fourth resistor and a second transistor; a cathode of the second diode is connected to a signal transmitting end of the signal interface module, and an electro-optical signal conversion and optical signal transmitting module
  • the anode of the second diode is connected to the base of the second transistor through a fourth resistor, and the emitter of the second transistor is connected to the optical signal receiving and photoelectric signal conversion module, a collector of the diode is connected to the receiving end of the signal interface module;
  • the signal transmitting end when the signal transmitting end sends a signal, the signal transmitting end is in a high level state, and the switch control module is in an off state after receiving the high level of the signal transmitting end, and the signal receiving end rejects the receiving signal, and only the signal can be transmitted at this time. Avoiding the feedback signal of obstacles transmitted to the signal receiving end affects the normal operation of the upper computer; when the signal transmitting end stops transmitting the signal, the signal transmitting end is in a low level state, and the switch control module receives the low level of the signal transmitting end In the closed state, the signal receiving end is allowed to receive the signal. At this time, the received and converted electrical signal is connected to the signal interface module from the signal receiving end; when the information transmitting end sends the signal, when the signal transmitting end is in the low level state, the fault occurs.
  • the warning module issues a warning.
  • the power circuit module includes a rectifying unit and a filtering unit, the rectifying unit includes a rectifying diode D1, the filtering unit includes a filter capacitor, and an anode of the rectifying diode D1 is connected to the signal interface module, and the rectifying diode The negative pole of the D1 is connected to one end of the filter capacitor, and the other end of the filter capacitor is grounded.
  • the common junction of the rectifier diode and the filter capacitor is connected to the output end of the power circuit module to respectively convert the electro-optical signal and the optical signal. Module and optical signal receiving and photoelectric signal conversion module.
  • the second triode is a PNP type triode.
  • the signal interface module is an RS232 interface.
  • another technical solution adopted by the present invention is to provide a communication method of a feedback-free communication converter, including the following steps.
  • the signal transmitting end of the signal interface module uploads an electrical signal
  • the electro-optical signal conversion and the optical signal transmitting module receive the electrical signal and convert the electrical signal into an optical signal, and the switch control module cuts off the connection between the signal interface module and the optical signal receiving and photoelectric signal conversion module;
  • the switch control module reconnects the signal interface module with the optical signal receiving and photoelectric signal conversion module;
  • the optical signal receiving and photoelectric signal conversion module receives the optical signal and converts the optical signal into an electrical signal, and transmits the electrical signal to the signal interface module.
  • the beneficial effects of the present invention are: different from the problem that the wireless signal transmitted by the upper computer through the communication converter may be partially or completely fed back to the upper computer receiving port to affect the normal operation of the upper computer,
  • the invention provides a feedback-free communication converter, which can eliminate the influence of the prior art wireless signal generation feedback on the upper computer by setting the switch control module. Specifically, when the signal transmitting end sends a signal, the signal transmitting end is in a high level state, and the switch control module is in an off state after receiving the high level of the signal transmitting end, and the signal receiving end rejects the receiving signal, and only the signal can be transmitted at this time.
  • the present invention can effectively avoid the reception of the feedback signal at the signal receiving end, and can improve the reliability of the wireless communication.
  • FIG. 1 is a circuit block diagram of an embodiment of the present invention
  • FIG. 2 is a circuit configuration diagram of an embodiment of the present invention.
  • 101-signal interface module 101-signal interface module, 102-power circuit module, 103-electro-optical signal conversion and optical signal transmitting module, 104-switch control module, 105-optical signal receiving and photoelectric signal conversion module, TXD-signal transmitting end, RXD-signal receiving End, TD1-infrared launch tube, RT1-infrared receiver tube.
  • Non-feedback communication converter The communication signal sent by the computer is transmitted through the infrared transmitting tube TD1 of the non-feedback communication converter. Even if there is an obstacle in front, the transmitted signal will not be fed back to the receiving port of the computer.
  • the "no feedback type communication converter” is hereinafter sometimes referred to simply as “no feedback converter”.
  • the present invention provides a feedback-free communication converter, a signal interface module 101, a power circuit module 102, an electro-optical signal conversion and optical signal transmitting module 103, a switch control module 104, optical signal receiving, and photoelectric signal conversion.
  • the signal interface module 101 includes a signal transmitting end TXD and a signal receiving end RXD, the signal receiving end RXD is connected to an output end of the switch control module 104; the signal transmitting end TXD
  • the electro-optical signal conversion and optical signal transmitting module 103 and the controlled end of the switch control module 104 are respectively connected, and the input end of the switch control module 104 is connected to the optical signal receiving and photoelectric signal conversion module 105, and the output of the switch control module 104
  • the end is connected to the signal receiving end RXD of the signal interface module; the input end of the power circuit module 102 is connected to the signal interface module 101, and the output end of the power circuit module 102 is connected to the electro-optical signal conversion and optical signal transmitting module 103.
  • the power circuit module 102 is respectively connected to the electro-optical signal conversion and optical signal transmitting module 103 and optical signal receiving And a photoelectric signal conversion module 105, wherein the power circuit module is configured to provide a power supply for the electro-optical signal conversion and the optical signal transmission module and the optical signal receiving and photoelectric signal conversion module; the fault warning module 106 is directly connected to the signal interface module 101.
  • the electrical signal is transmitted through the signal transmitting end of the signal interface module, and the electrical signal is converted into an optical signal by the electro-optical signal conversion and the optical signal transmitting module, and is externally emitted by the infrared transmitting tube in the form of electromagnetic waves, the optical signal receiving and the photoelectric signal
  • the infrared receiving tube in the conversion module is capable of receiving and converting the processed transmission signal into an electrical signal, and the electrical signal is transmitted to the signal receiving end of the signal interface module through the switch module; in the process of transmitting the electrical signal, the signal transmitting end is at a high position
  • the switch control module receives the high level sent by the signal transmitting end and is in the off state. At this time, the signal receiving end stops receiving the signal.
  • the signal transmitting end When the electrical signal is stopped, the signal transmitting end is in the low state, and the switch is controlled. After receiving the low level sent by the signal transmitting end, the module is in a closed state, and the signal receiving module is allowed to receive the signal; the power circuit module is used to provide energy for the process of signal conversion and the process of transmitting and receiving signals.
  • the present invention is different from the prior art in that the wireless signal transmitted by the upper computer through the infrared communication converter may be partially or completely fed back to the upper computer receiving port to affect the normal operation of the upper computer, and the present invention provides A feedback-free communication converter eliminates the influence of the prior art wireless signal generation feedback on the upper computer by setting the switch control module. Specifically, when the signal transmitting end sends a signal, the signal transmitting end is in a high level state, and the switch control module is in an off state after receiving the high level of the signal transmitting end, and the signal receiving end rejects the receiving signal, and only the signal can be transmitted at this time.
  • the present invention can effectively avoid the reception of the feedback signal at the signal receiving end, and can improve the reliability of the wireless communication.
  • the switch control module 104 includes a second diode D2, a fourth resistor R4 and a second transistor Q2, and a cathode of the second diode D2 is an input.
  • the anode of the second diode D2 is connected to the base of the second transistor Q2 through a fourth resistor R4, and the emitter of the second transistor Q2 is connected to the optical signal receiving and photoelectric signal conversion.
  • the module 105, the collector of the second transistor Q2 is connected to the signal receiving end RXD of the signal interface module of the signal interface module 101.
  • the power circuit module 102 includes a rectifier diode D1 and a filter capacitor C1.
  • the anode of the rectifier diode D1 is connected to the signal interface module 101, and the cathode of the rectifier diode D1 is connected to one end of the filter capacitor C1.
  • the other end of the filter capacitor C1 is grounded, and the common junction of the rectifier diode D1 and the filter capacitor C1 is connected as an output end of the power circuit module 102 to the electro-optical signal conversion and optical signal transmission module 103 and the optical signal receiving and photoelectric signals.
  • the electro-optic signal conversion and optical signal transmitting module 103 includes a first resistor R1, a second resistor R2, an infrared transmitting tube TD1, and a first transistor Q1.
  • the base of the first transistor Q1 is externally connected through the first resistor R1.
  • the positive terminal is connected to the output terminal of the power circuit module 102 through the first resistor R1.
  • the optical signal receiving and photoelectric signal conversion module 105 includes an infrared receiving tube RT1 and a third resistor R3.
  • the negative end of the infrared receiving tube RT1 is connected to the power circuit module 102, and the positive end of the infrared receiving tube RT1 is received as an optical signal.
  • an output end of the photoelectric signal conversion module 105 is connected to the switch control module 104, one end of the third resistor R3 is connected to a common contact of the signal interface module 101 and the receiving signal switch control module 104, and the third resistor R3 The other end is grounded.
  • the first resistor is a current limiting resistor during electro-optical conversion
  • the second resistor is a current limiting resistor for transmitting a signal
  • the third resistor is a current limiting resistor during photoelectric conversion
  • the fourth resistor is an adjustment a variable resistance of the second transistor, the second diode protecting the collector and the base of the second transistor from being reversely broken, the first transistor for amplifying the transmitted electrical signal
  • the second triode is used for switching on and off of the switch control module
  • the signal interface module is an RS232 interface.
  • the invention also provides a communication method of a feedback-free communication converter, comprising the following steps,
  • the signal transmitting end of the signal interface module uploads an electrical signal
  • the electro-optical signal conversion and the optical signal transmitting module receive the electrical signal and convert the electrical signal into an optical signal, and the switch control module cuts off the connection between the signal interface module and the optical signal receiving and photoelectric signal conversion module;
  • the switch control module reconnects the signal interface module with the optical signal receiving and photoelectric signal conversion module;
  • the optical signal receiving and photoelectric signal conversion module receives the optical signal and converts the optical signal into an electrical signal, and transmits the electrical signal to the signal interface module.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optical Communication System (AREA)

Abstract

本发明公开了一种无反馈式通讯转换器及其通讯方法，包括信号接口模块、电源电路模块、电光信号转换及光信号发射模块、开关控制模块、光信号接收及光电信号转换模块；所述信号接口模块包括信号发送端和信号接收端，所述信号发送端与电光信号转换及光信号发射模块连接，所述信号接收端连接至所述开关控制模块的输出端；本发明通过采用开关控制模块来控制信号接口模块接收信号，能够有效地避免信号接收端对发射信号遇到障碍物产生的反馈信号的接收，因而能够提高无线通讯的可靠。

Description

无反馈式通讯转换器及其通讯方法
【技术领域】
本发明涉及一种电能表适配器，尤其涉及一种无反馈式通讯转换器及其通讯方法。
【背景技术】
随着电能表行业的不断发展，出现了各种类型的电能表，红外抄表式电能表就属于电能表一种类型。上位机可以通过红外通讯探头与红外抄表式电能表建立起无线通信关系。但根据ICE62056-21及DL/T-645等标准要求，红外通讯头的要求为：内径最大不超过13mm，内部最大空间高度不超过38mm的圆柱形设备。
由于受空间限制，现有技术中的红外抄表式电能表通常使用反馈式RS232-红外通讯转换器。反馈式RS232-红外通讯转换器的工作原理为：电脑发出的通讯信号，通过RS232-红外通讯转换器的红外发射管发射发出后，如果前面有障碍物，则发射出去的信号会全部或部分反射回来，被红外接收器接收，通过RS232-红外通讯转换器逆向反馈到电脑的接收端口。馈式RS232-红外通讯转换器有一个比较大的缺陷就是发射出去的信号有时不能完全反馈回来，这给上位机的处理工作带来很大的不便，甚至使上位机的错误率明显升高，影响上位机与红外抄表式电能表的无线通信。
2002年07月24日公开的中国专利CN1360387公开了一种电力领域中的配电终端现场维护通讯系统，其技术方案为：包括第一红外收发器和第二红外收发器：所述的第一红外收发器安装在配电终端内部，包括维护口通讯方式转换开关、红外发射单元和红外接收单元；所述的红外发射单元的输入端和所述的红外接收单元的输出端通过所述的维护口通讯方式转换开关分别与配电终端维护口的输出端和输入端串联；所述的维护口通讯方式转换开关通过切换能够将配电终端维护口的输出端和输入端恢复到和RS232的输出端和输入端串联；所述的第二红外收发器由红外发射单元、红外接收单元以及RS232接口组成；所述的红外发射单元、红外接收单元分别和RS232接口的输入端和输出端串联；所述的第二红外收发器通过RS232接口和具有RS232串口的PC机连接，该发明主要依靠采用红外通讯技术来提高配电终端通信的可靠性，进而方便高空作业，但没有解决发射的无线信号遇到障碍物时产生的反馈信号干扰上位机判断的问题。
【发明内容】
本发明为解决的现有技术中上位机通过RS232红外通讯转换器发射的无线信号遇到障碍物时可能会出现的部分或全部反馈到上位机接收端口影响上位机的正常工作的问题，提出了一种无反馈式通讯转换器及其通讯方法。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种无反馈式通讯转换器，包括信号接口模块、电源电路模块、电光信号转换及光信号发射模块、开关控制模块、光信号接收及光电信号转换模块，以及故障警告模块；
所述信号接口模块包括信号发送端和信号接收端，所述信号发送端与电光信号转换及光信号发射模块连接，所述信号接收端连接至所述开关控制模块的输出端；
所述信号发送端分别连接所述电光信号转换及光信号发射模块与所述开关控制模块的受控端，开关控制模块的输入端连接至光信号接收及光电信号转换模块，开关控制模块的输出端连接至信号接收端；
所述电源电路模块的输入端连接至信号接口模块，所述电源电路模块的输出端分别连接至电光信号转换及光信号发射模块与光信号接收及光电信号转换模块；
所述开关控制模块包括第二二极管，第四电阻和第二三极管；所述第二二极管的负极连接所述信号接口模块的信号发送端与电光信号转换及光信号发射模块，所述第二二极管的正极通过第四电阻连接第二三极管的基极，所述第二三极管的发射极连接至所述光信号接收及光电信号转换模块，所述第二三极管的集电极连接所述信号接口模块的接收端；
其中，当信号发送端发送信号时，信号发送端处于高电平状态，开关控制模块接收到信号发送端的高电平后处于断开状态，信号接收端拒绝接收信号，这时只能发射信号，避免遇到障碍物的反馈信号传送至信号接收端影响上位机的正常工作；当信号发送端停止发送信号时，信号发送端处于低电平状态，开关控制模块接收到信号发送端的低电平后处于闭合状态，信号接收端允许接收信号，这时经接收转换的电信号从信号接收端接入信号接口模块；当信息发送端发送信号时，信号发送端处于低电平状态时，所述故障警告模块发出警告。
其中，所述电源电路模块包括整流单元和滤波单元，所述整流单元包括整流二极管D1，所述滤波单元包括滤波电容，所述整流二极管D1的正极连接至所述信号接口模块，所述整流二极管D1的负极连接至所述滤波电容的一端，所述滤波电容的另一端接地，所述整流二极管和滤波电容连接的公共接点作为电源电路模块的输出端分别连接所述电光信号转换及光信号发射模块与所光信号接收及光电信号转换模块。
其中，所述第二三极管为PNP型三极管。
其中，所述信号接口模块为RS232接口。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种无反馈式通讯转换器的通讯方法，包括如下步骤，
S1、信号接口模块的信号发送端上传电信号；
S2、电光信号转换及光信号发射模块接收电信号并将电信号转换成光信号，同时开关控制模块切断信号接口模块与光信号接收及光电信号转换模块之间的连接；
S3、电信号上传完毕，开关控制模块重新连接信号接口模块与光信号接收及光电信号转换模块；
S4、光信号接收及光电信号转换模块接收光信号并将光信号转换成电信号，并将电信号传送至信号接口模块。
本发明的有益效果是：区别于现有技术中上位机通过通讯转换器发射的无线信号遇到障碍物时可能会出现的部分或全部反馈到上位机接收端口影响上位机的正常工作的问题，本发明提供了一种无反馈式通讯转换器，通过设置开关控制模块来消除现有技术无线信号发生反馈时对上位机的影响。具体为：当信号发送端发送信号时，信号发送端处于高电平状态，开关控制模块接收到信号发送端的高电平后处于断开状态，信号接收端拒绝接收信号，这时只能发射信号，避免遇到障碍物的反馈信号传送至信号接收端影响上位机的正常工作；当信号发送端停止发送信号时，信号发送端处于低电平状态，开关控制模块接收到信号发送端的低电平后处于闭合状态，信号接收端允许接收信号，这时经接收转换的电信号从信号接收端接入信号接口模块。综上，本发明能够有效避免信号接收端对反馈信号的接收，能够提高无线通讯的可靠性。
【附图说明】
图1是本发明一实施例的电路框图；
图2是本发明一实施例的电路结构图。
标号说明：
101-信号接口模块，102-电源电路模块，103-电光信号转换及光信号发射模块，104-开关控制模块，105-光信号接收及光电信号转换模块，TXD-信号发送端，RXD-信号接收端，TD1-红外发射管，RT1-红外接收管。
【具体实施方式】
为详细说明本发明的技术内容、构造特征、所实现目的及效果，以下结合实施方式并配合附图详予说明。
无反馈式通讯转换器：电脑发出的通讯信号，通过无反馈式通讯转换器的红外发射管TD1发射发出后，即使前面有障碍物，发射出去的信号也不会反馈到电脑的接收端口。“无反馈式通讯转换器”以下有时简称为“无反馈式转换器”。
请参阅图1，本发明提供了一种无反馈式通讯转换器，信号接口模块101、电源电路模块102、电光信号转换及光信号发射模块103、开关控制模块104、光信号接收及光电信号转换模块105，以及故障警告模块106；所述信号接口模块101包括信号发送端TXD和信号接收端RXD，所述信号接收端RXD连接至所述开关控制模块104的输出端；所述信号发送端TXD分别连接所述电光信号转换及光信号发射模块103与所述开关控制模块104的受控端，开关控制模块104的输入端连接至光信号接收及光电信号转换模块105，开关控制模块104的输出端连接至信号接口模块的信号接收端RXD；所述电源电路模块102的输入端连接至信号接口模块101，所述电源电路模块102的输出端连接至电光信号转换及光信号发射模块103，所述电源电路模块102分别连接所述电光信号转换及光信号发射模块103与光信号接收及光电信号转换模块105，电源电路模块用于提供电光信号转换及光信号发射模块与光信号接收及光电信号转换模块的电源；所述故障警告模块106与所述信号接口模块101直接相连。
工作时，电信号通过信号接口模块的信号发送端发送，经过电光信号转换及光信号发射模块将电信号转换成光信号并通过红外发射管以电磁波的方式向外发射，光信号接收及光电信号转换模块中的红外接收管能够接收并将经过处理后的发射信号转换成电信号，电信号通过开关模块传送至信号接口模块的信号接收端；在电信号发送的过程中，信号发送端处于高电平状态，开关控制模块接收到信号发送端发送的高电平后处于断开状态，此时信号接收端停止接收信号，当停止发送电信号时，信号发送端处于低电平状态，开关控制模块接收到信号发送端发送的低电平后处于闭合状态，此时信号接收模块允许接收信号；电源电路模块用于为信号转化的过程和信号收发的过程提供能量。
本发明区别于现有技术中上位机通过红外通讯转换器发射的无线信号遇到障碍物时可能会出现的部分或全部反馈到上位机接收端口影响上位机的正常工作的问题，本发明提供了一种无反馈式通讯转换器，通过设置开关控制模块来消除现有技术无线信号发生反馈时对上位机的影响。具体为：当信号发送端发送信号时，信号发送端处于高电平状态，开关控制模块接收到信号发送端的高电平后处于断开状态，信号接收端拒绝接收信号，这时只能发射信号，避免遇到障碍物的反馈信号传送至信号接收端影响上位机的正常工作；当信号发送端停止发送信号时，信号发送端处于低电平状态，开关控制模块接收到信号发送端的低电平后处于闭合状态，信号接收端允许接收信号，这时经接收转换的电信号从信号接收端接入信号接口模块；当信息发送端发送信号时，信号发送端处于低电平状态时，所述故障警告模块发出警告。综上，本发明能够有效避免信号接收端对反馈信号的接收，能够提高无线通讯的可靠性。
参阅图2，在一具体的实施例中，所述开关控制模块104包括第二二极管D2，第四电阻R4和第二三极管Q2，所述第二二极管D2的负极为输入端，所述第二二极管D2的正极通过第四电阻R4连接第二三极管Q2的基极，所述第二三极管Q2的发射极连接至所述光信号接收及光电信号转换模块105，所述第二三极管Q2的集电极连接所述信号接口模块101的信号接口模块的信号接收端RXD。所述电源电路模块102包括整流二极管D1和滤波电容C1，所述整流二极管D1的正极连接至所述信号接口模块101，所述整流二极管D1的负极连接至所述滤波电容C1的一端，所述滤波电容C1的另一端接地，所述整流二极管D1和滤波电容C1连接的公共接点作为电源电路模块102的输出端分别连接至所述电光信号转换及光信号发射模块103与光信号接收及光电信号转换模块105。所述电光信号转换及光信号发射模块103包括第一电阻R1、第二电阻R2、红外发射管TD1、第一三极管Q1，第一三极管Q1的基极通过第一电阻R1外接信号接口模块101的信号发送端TXD，所述第一三极管Q1的发射极接地，所述第一三极管Q1的集电极连接至所述红外发射管TD1的负端，红外发射管TD1的正端通过第一电阻R1连接电源电路模块102的输出端。所述光信号接收及光电信号转换模块105包括红外接收管RT1、第三电阻R3，所述红外接收管RT1的负端连接电源电路模块102，所述红外接收管RT1的正端作为光信号接收及光电信号转换模块105的输出端连接至所述开关控制模块104，所述第三电阻R3的一端连接至所述信号接口模块101与接收信号开关控制模块104连接的公共接点，第三电阻R3的另一端接地。
其中，所述第一电阻为电光转换时的限流电阻，所述第二电阻为发送信号的限流电阻，所述第三电阻为光电转换时的限流电阻，所述第四电阻为调节第二三极管的可变电阻，所述第二二极管保护第二三极管的集电极和基极不被反向击穿，所述第一三极管用于放大发送的电信号，所述第二三极管用于开关控制模块的通断，所述信号接口模块为RS232接口。
本发明还提供了一种无反馈式通讯转换器的通讯方法，包括如下步骤，
S1、信号接口模块的信号发送端上传电信号；
S2、电光信号转换及光信号发射模块接收电信号并将电信号转换成光信号，同时开关控制模块切断信号接口模块与光信号接收及光电信号转换模块之间的连接；
S3、电信号上传完毕，开关控制模块重新连接信号接口模块与光信号接收及光电信号转换模块；
S4、光信号接收及光电信号转换模块接收光信号并将光信号转换成电信号，并将电信号传送至信号接口模块。
以上所述仅为本发明的实施例，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (5)

  1. 一种无反馈式通讯转换器，其特征在于，包括信号接口模块、电源电路模块、电光信号转换及光信号发射模块、开关控制模块、光信号接收及光电信号转换模块，以及故障警告模块；
    所述信号接口模块包括信号发送端和信号接收端，所述信号发送端与电光信号转换及光信号发射模块连接，所述信号接收端连接至所述开关控制模块的输出端；
    所述信号发送端分别连接所述电光信号转换及光信号发射模块与所述开关控制模块的受控端，开关控制模块的输入端连接至光信号接收及光电信号转换模块，开关控制模块的输出端连接至信号接收端；
    所述电源电路模块的输入端连接至信号接口模块，所述电源电路模块的输出端分别连接至电光信号转换及光信号发射模块与光信号接收及光电信号转换模块；
    所述开关控制模块包括一个二极管，一个电阻和一个三极管；所述二极管的负极连接所述信号接口模块的信号发送端与电光信号转换及光信号发射模块，所述二极管的正极通过所述电阻连接所述三极管的基极，所述三极管的发射极连接至所述光信号接收及光电信号转换模块，所述三极管的集电极连接所述信号接口模块的接收端；
    其中，当信号发送端发送信号时，信号发送端处于高电平状态，开关控制模块接收到信号发送端的高电平后处于断开状态，信号接收端拒绝接收信号，这时只能发射信号，避免遇到障碍物的反馈信号传送至信号接收端影响上位机的正常工作；当信号发送端停止发送信号时，信号发送端处于低电平状态，开关控制模块接收到信号发送端的低电平后处于闭合状态，信号接收端允许接收信号，这时经接收转换的电信号从信号接收端接入信号接口模块；当信息发送端发送信号时，信号发送端处于低电平状态时，所述故障警告模块发出警告。
  2. 根据权利要求1所述的无反馈式通讯转换器，其特征在于，所述电源电路模块包括整流单元和滤波单元，所述整流单元包括整流二极管，所述滤波单元包括滤波电容，所述整流二极管的正极连接至所述信号接口模块，所述整流二极管的负极连接至所述滤波电容的一端，所述滤波电容的另一端接地，所述整流二极管和滤波电容连接的公共接点作为电源电路模块的输出端分别连接所述电光信号转换及光信号发射模块与所光信号接收及光电信号转换模块。
  3. 根据权利要求1所述的无反馈式通讯转换器，其特征在于，所述三极管为PNP型三极管。
  4. 根据权利要求3所述的无反馈式通讯转换器，其特征在于，所述信号接口模块为RS232接口。
  5. 一种根据权利要求1-4所述无反馈式通讯转换器的通讯方法，其特征在于，包括如下步骤，
    S1、信号接口模块的信号发送端上传电信号；
    S2、电光信号转换及光信号发射模块接收电信号并将电信号转换成光信号，同时开关控制模块切断信号接口模块与光信号接收及光电信号转换模块之间的连接；
    S3、电信号上传完毕，开关控制模块重新连接信号接口模块与光信号接收及光电信号转换模块；
    S4、光信号接收及光电信号转换模块接收光信号并将光信号转换成电信号，并将电信号传送至信号接口模块。
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