CN110649931A - Anti-attenuation discrete signal sending device - Google Patents

Anti-attenuation discrete signal sending device Download PDF

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CN110649931A
CN110649931A CN201910993425.XA CN201910993425A CN110649931A CN 110649931 A CN110649931 A CN 110649931A CN 201910993425 A CN201910993425 A CN 201910993425A CN 110649931 A CN110649931 A CN 110649931A
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module
voltage
submodule
output
voltage division
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CN110649931B (en
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全浩军
所玉君
崔建飞
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Tianjin Jinhang Computing Technology Research Institute
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/02—Transmitters
    • H04B1/04—Circuits
    • H04B1/0475—Circuits with means for limiting noise, interference or distortion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/04—Control of transmission; Equalising

Abstract

The invention discloses an anti-attenuation discrete signal sending device which comprises five modules, namely a power supply module, a main control acquisition integrated module, a voltage division module, a voltage regulation module and an output switching module. The device can resist cable attenuation, ensure the voltage of a receiving end and enhance the transmission reliability of discrete signals.

Description

Anti-attenuation discrete signal sending device
Technical Field
The invention belongs to the field of signal transmission, and relates to an anti-attenuation discrete signal sending device.
Background
The binary discrete signal transmission based on high and low levels has the advantages of simple circuit, convenience in detection and the like, and is widely applied to equipment and systems. When discrete signal transmission is carried out among different devices through cables, in order to avoid the influence of high-level amplitude attenuation on signal transmission reliability, the conventional method is usually a mode of adopting a high-voltage high-level signal to reduce attenuation proportion, although the mode meets the reliable transmission requirement of a specific system to a certain extent, the high-level signal with fixed voltage has poor adaptability, and the self-adaptive adjustment can not be carried out in long-distance and large-impedance cable transmission or when the signal current is larger, so that the voltage of a receiving end cannot be ensured, and the hidden danger of transmission errors exists. This can have very serious consequences for critical discrete signals affecting the core functionality of the system.
Disclosure of Invention
Objects of the invention
The purpose of the invention is: aiming at the problems of the existing discrete signal transmission method, the device for transmitting the discrete signal with the attenuation resistance is provided.
(II) technical scheme
In order to solve the technical problem, the invention provides an anti-attenuation discrete signal transmitting device which is characterized by comprising five modules, namely a power supply module, a main control and acquisition integrated module, a voltage division module, a voltage regulation module and an output switching module, wherein:
the power supply module generates two voltages, wherein one voltage is less than or equal to 5V and is used for supplying power to the parameter regulation submodule, the main control acquisition integrated module and the output switching module in the voltage regulation module, and the other voltage is greater than 5V and is used for supplying power to the output driving submodule in the voltage regulation module;
the master control acquisition integrated module supports two paths of analog quantity acquisition and control functions on the parameter regulation submodule and the output switching module, wherein 1 path of the two paths of analog quantity acquisition is connected with the voltage division submodule 1 in the voltage division module, and the voltage value is U'1The other path is connected with a voltage division submodule 2 in the voltage division module, and the voltage value is U'2(ii) a The control function of the parameter adjusting submodule is that the parameter adjusting submodule is controlled by a local bus to change the parameter of a certain device, and then the output driving submodule changes the output voltage; and controlling the output switching module, specifically, changing the high and low level states of the output discrete signal through the control signal of the output switching module.
The voltage division module is composed of two same voltage division submodules (a voltage division submodule 1 and a voltage division submodule 2), the voltage division submodules are composed of two high-precision voltage division resistors, and the voltage division resistors are far smaller than the analog quantity acquisition pin input impedance of the master control acquisition integrated module. In the voltage division submodule 1, two resistors are marked as R'L0And R ″)L0，R′L0One end ofIs connected with the acquisition loop 1, and the other end is connected with R ″)L0Are connected and simultaneously connected with a main control acquisition integrated module, R ″)L0The other end of the connecting rod is connected with the ground; in the voltage division submodule 2, two resistors are marked as R'L2And R ″)L2，R′L2One end is connected with the acquisition loop 2, and the other end is connected with R ″)L2Are connected and simultaneously connected with a main control acquisition integrated module, R ″)L2The other end of which is connected to ground. The acquisition loop 1 is directly connected with the output of the output switching module in the device, and the acquisition loop 2 is connected with the output of the output switching module at the farthest end of the cable outside the device. The cable used by the acquisition loop 2 is completely consistent with the cable type and length used by the output switching module for outputting the discrete signals.
The voltage regulating module consists of a parameter regulating submodule and an output driving submodule, wherein the parameter regulating submodule is connected with the main control acquisition integrated module through a local bus, and can change parameters of a certain device or read back current parameter information under the control of the main control acquisition integrated module; the parameter adjusting submodule has a memory function and can restore the state before power failure when being powered on again; the output driving sub-module is influenced by device parameters, can correspondingly change output voltage and sends the voltage to the output switching module for high-level output.
The output switching module is controlled by the master control acquisition integrated module to realize the high and low level switching function of discrete signal output.
The anti-attenuation discrete signal transmitting device can calculate the voltage U of the receiving end while outputting high levelLAnd is in ULWhen the voltage is lower than the set value, the voltage is increased through the voltage regulating module so as to achieve the purpose of attenuation resistance. U shapeLThe calculation formula is as follows:
Figure BDA0002239013720000021
wherein
Figure BDA0002239013720000022
RL1Is the receiving end equivalent load resistance.
(III) advantageous effects
The anti-attenuation discrete signal sending device provided by the technical scheme can resist cable attenuation, ensure the voltage of a receiving end and enhance the transmission reliability of discrete signals.
Drawings
Fig. 1 is a schematic connection diagram of an anti-fading discrete signal transmitting apparatus according to the present invention.
Fig. 2 is a schematic diagram of an equivalent resistance model of an anti-fading discrete signal transmitting device according to the present invention.
Detailed Description
In order to make the objects, contents and advantages of the present invention clearer, the following detailed description of the embodiments of the present invention will be made in conjunction with the accompanying drawings and examples.
Referring to fig. 1 and 2, an embodiment of an anti-fading discrete signal transmitting apparatus according to the present invention is as follows:
the utility model provides an anti discrete signalling device that attenuates, gathers integration module, partial pressure module, pressure regulating module, output switching module by power module, master control and totally five modules constitute, wherein:
the method comprises the steps of constructing a master control acquisition integrated module by using a TMS320F28335 chip of TI company, constructing a voltage division module by using four resistors with the precision superior to 1%, constructing a voltage regulation module by using a digital potentiometer and an operational amplifier, and constructing an output switching module by using a relay.
The power supply module generates two voltages, wherein one voltage is 3.3V and 1.8V and is used for supplying power to the parameter regulation submodule, the main control acquisition integrated module and the output switching module in the voltage regulation module, and the other voltage is 15V high-level voltage and is used for supplying power to the output driving submodule in the voltage regulation module;
TMS320F28335 in the master control acquisition integrated module supports two-path analog quantity acquisition and control functions of a digital potentiometer and a relay, wherein 1 path in the two-path analog quantity acquisition is connected with a voltage division submodule 1 in a voltage division module, and the voltage value is U'1The other path is connected with a voltage division submodule 2 in the voltage division module, and the voltage value is U'2(ii) a To pairThe control function of the parameter adjusting submodule is specifically that a local bus is used for controlling a digital potentiometer to change a resistance value, and then an operational amplifier is used for changing output voltage; the output switching module is controlled, and particularly, the high and low level states of the output discrete signals are changed through the relay control signals.
Each voltage division submodule in the voltage division module is composed of two high-precision voltage division resistors, and the voltage division resistors are far smaller than the analog quantity acquisition input impedance of TMS320F 28335. In the voltage division submodule 1, two resistors are marked as R'L0And R ″)L0，R′L0One end is connected with the acquisition loop 1, and the other end is connected with R ″)L0Are connected and simultaneously connected with a main control acquisition integrated module, R ″)L0The other end of the connecting rod is connected with the ground; in the voltage division submodule 2, two resistors are marked as R'L2And R ″)L2，R′L2One end is connected with the acquisition loop 2, and the other end is connected with R ″)L2Are connected and simultaneously connected with a main control acquisition integrated module, R ″)L2The other end of which is connected to ground. The acquisition loop 1 is directly connected with the output of the output switching module in the device, and the acquisition loop 2 is connected with the output of the output switching module at the farthest end of the cable outside the device. The cable used by the acquisition loop 2 is completely consistent with the cable type and length used by the output switching module to output the discrete signal, and the equivalent resistances are respectively recorded as R2And R1I.e. R1＝R2。
The digital potentiometer in the voltage regulating module is connected with the TMS320F28335 through a local bus, and the resistance value of the resistor can be changed or the current block can be read back under the control of the TMS320F28335 chip; a digital potentiometer with a memory function is selected, and the state before power failure can be recovered when the power is on again; the operational amplifier can correspondingly change the output voltage along with the change of the resistance and send the voltage to the relay for high-level output.
And a relay of the output switching module is controlled by TMS320F28335, so that the high and low level switching function of discrete signal output is realized.
The device can calculate the voltage U of the receiving end while outputting high levelLAnd is in ULThe voltage is increased by the voltage regulating module when the voltage is lower so as to achieve the purpose of attenuation resistanceThe purpose is.
Referring to fig. 2, since the voltage dividing resistance of the voltage dividing submodule is much smaller than the analog quantity acquisition input impedance of TMS320F28335, it can be considered that the voltage dividing resistance passes through R2All current of (2) flows through R'L2And R ″)L2To obtain the formula:
Figure BDA0002239013720000041
using RL1Representing the receiving end equivalent load resistance. Through RL1And R2Is flowing through R1, so there is the formula:
Figure BDA0002239013720000042
according to equation (1), we obtain:
Figure BDA0002239013720000051
due to R1＝R2Therefore, the formula (3) can be substituted into the formula (2) to obtain
Figure BDA0002239013720000052
Namely:
Figure BDA0002239013720000053
equation (5) relates to ULA quadratic equation of one unit of (1) due to
Figure BDA0002239013720000054
And U isL0 or more, therefore:
wherein
Figure BDA0002239013720000056
Figure BDA0002239013720000057
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (7)

1. An anti-fading discrete signal transmission device, comprising: the system comprises a main control acquisition integrated module, a voltage division module, a voltage regulation module and an output switching module; the voltage division module comprises two identical voltage division submodules, namely a voltage division submodule 1 and a voltage division submodule 2; the pressure regulating module comprises a parameter regulating submodule and an output driving submodule; the main control acquisition integrated module supports two paths of analog quantity acquisition and controls the parameter regulation submodule and the output switching module, wherein acquisition loops 1 in the two paths of analog quantity acquisition are connected with a voltage division submodule 1 in the voltage division module, and the voltage value is U'1The acquisition loop 2 is connected with a voltage division submodule 2 in the voltage division module, and the voltage value is U'2(ii) a The main control acquisition integrated module controls the parameter adjusting sub-module to change parameters of a certain device or reads back current parameter information through a local bus, and then changes output voltage through the output driving sub-module; the master control acquisition integrated module changes the high and low level states of the output discrete signals through the control signals of the output switching module.
2. The apparatus of claim 1, wherein the parameter adjustment submodule has a memory function and is capable of restoring a state before power failure when power is again applied; the output driving sub-module is influenced by device parameters, correspondingly changes the output voltage, and sends the voltage to the output switching module for high-level output.
3. The anti-attenuation discrete signal sending device according to claim 2, wherein the voltage division submodule 1 and the voltage division submodule 2 are both composed of two voltage division resistors, and the voltage division resistors are smaller than the input impedance of the analog quantity acquisition pin of the master control acquisition integration module.
4. The apparatus according to claim 3, wherein two resistors are R 'in the voltage divider submodule 1'L0And R ″)L0，R′L0One end is connected with the acquisition loop 1, and the other end is connected with R ″)L0Are connected and simultaneously connected with a main control acquisition integrated module, R ″)L0The other end of the connecting rod is connected with the ground; in the voltage division submodule 2, two resistors are marked as R'L2And R ″)L2，R″L2One end is connected with the acquisition loop 2, and the other end is connected with R ″)L2Are connected and simultaneously connected with a main control acquisition integrated module, R ″)L2The other end of which is connected to ground.
5. The apparatus for transmitting discrete signal with anti-attenuation of claim 4, wherein the collection loop 1 is directly connected to the output of the output switching module in the apparatus, and the collection loop 2 is connected to the output of the output switching module at the farthest end of the cable outside the apparatus; the cable used by the acquisition loop 2 is completely consistent with the cable type and length used by the output switching module for outputting the discrete signals.
6. The anti-fading discrete signal transmission device as set forth in claim 5, further comprising: and the power supply module generates two voltages, wherein one voltage is less than or equal to 5V and is used for supplying power to the parameter regulation submodule, the main control acquisition integrated module and the output switching module in the voltage regulation module, and the other voltage is greater than 5V and is used for supplying power to the output driving submodule in the voltage regulation module.
7. The transmission apparatus of claim 6, wherein the transmission apparatus calculates a receiving end voltage U while outputting a high levelLAnd is in ULWhen the voltage is lower, the voltage is increased through the voltage regulating module; u shapeLThe calculation formula is as follows:
Figure FDA0002239013710000021
wherein
Figure FDA0002239013710000022
Figure FDA0002239013710000023
RL1Is the receiving end equivalent load resistance.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7099163B1 (en) * 2005-11-14 2006-08-29 Bcd Semiconductor Manufacturing Limited PWM controller with constant output power limit for a power supply
CN103166450A (en) * 2013-04-15 2013-06-19 矽力杰半导体技术(杭州)有限公司 Voltage transmission loss compensation circuit, compensation method, control chip and switching power supply
CN104467878A (en) * 2013-09-16 2015-03-25 华为技术有限公司 Signal amplitude adjusting method and communication terminals
CN107482909A (en) * 2017-07-28 2017-12-15 惠州市德赛西威汽车电子股份有限公司 A kind of line loss compensation circuit of power supply
CN109407999A (en) * 2018-11-16 2019-03-01 郑州云海信息技术有限公司 A kind of signal antidote, system and device

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7099163B1 (en) * 2005-11-14 2006-08-29 Bcd Semiconductor Manufacturing Limited PWM controller with constant output power limit for a power supply
CN103166450A (en) * 2013-04-15 2013-06-19 矽力杰半导体技术(杭州)有限公司 Voltage transmission loss compensation circuit, compensation method, control chip and switching power supply
CN104467878A (en) * 2013-09-16 2015-03-25 华为技术有限公司 Signal amplitude adjusting method and communication terminals
CN107482909A (en) * 2017-07-28 2017-12-15 惠州市德赛西威汽车电子股份有限公司 A kind of line loss compensation circuit of power supply
CN109407999A (en) * 2018-11-16 2019-03-01 郑州云海信息技术有限公司 A kind of signal antidote, system and device

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