CN217467047U - Electronic product testing device - Google Patents

Abstract

The utility model provides an electronic product testing arrangement, after the serial signal that discrete switch signal output module forwarded the master controller converted the discrete switch signal, will break the parallel output of shut-off signal. The periodic switching signal output module converts the periodic pulse signals into corresponding periodic switching signals and then outputs the periodic switching signals. The system can convert various serial signals of the measurement and control system into discrete switch signals and convert various periodic pulse signals into periodic switch signals, and can meet the requirements of outputting various control signals. And converting the accessed discrete digital signal into a serial signal through the discrete digital signal input module during signal receiving. And the periodic signal input module sends the processed periodic digital signal to the master controller. The analog voltage signal input module sends the processed analog voltage signals to the main controller, and then the main controller sends various signals to the measurement and control system. The cost of the test can be effectively reduced.

Description

Electronic product testing device

Technical Field

The utility model relates to a product testing technical field, more specifically say and relate to an electronic product testing arrangement.

Background

In the reliability test of electronic products, various electric signals need to be collected. At present, in order to meet the test requirements, various communication operation interfaces are integrated for use, for example, a USB interface, an Ethernet interface, a serial interface and the like are externally connected with a computer for use for testing, the simple integration mode has strong specificity, and more types of interfaces need to be integrated for testing along with the increase of the types of test signals, so that the test cost is increased.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides an electronic product testing device, include: the system comprises a main controller, a serial communication module, a discrete digital signal input module, a periodic signal input module and an analog voltage signal input module, wherein the serial communication module, the discrete digital signal input module, the periodic signal input module and the analog voltage signal input module are respectively connected with the main controller;

the main controller is connected with the measurement and control system through the serial communication module;

the discrete digital signal input module converts an accessed discrete digital signal into a serial signal, then sends the converted serial signal to the main controller, and the main controller sends the converted serial signal to the measurement and control system;

the periodic signal input module processes the accessed periodic digital signals, and then sends the processed periodic digital signals to the main controller, and the main controller sends the processed periodic digital signals to the measurement and control system;

the analog voltage signal input module processes the accessed analog voltage signal, sends the processed analog voltage signal to the main controller, and the main controller sends the processed analog voltage signal to the measurement and control system.

Further, the serial communication module includes: the serial port communication chip is used for converting a communication protocol when the main controller communicates with the measurement and control system, converting serial signals sent by the main controller to the measurement and control system into serial signals of an RS485 protocol, and converting serial signals sent by the measurement and control system to the main controller into serial signals of a UART protocol.

Further, the serial communication module further includes: and the optical coupler isolator is connected between the main controller and the serial port communication chip.

Further, the discrete digital signal input module includes:

the device comprises a first preprocessing unit and serial coding units, wherein the number of the serial coding units is at least two, and each serial coding unit is connected with two first preprocessing units;

the first preprocessing unit carries out voltage division, filtering and clamping protection on the accessed discrete digital signal and then sends the obtained processed discrete digital signal to the serial coding unit;

and after receiving the chip selection signal of the main controller, the serial coding unit codes the processed discrete digital signal into a corresponding serial signal.

Further, the periodic signal input module includes: and the second preprocessing unit is used for carrying out voltage division, filtering and clamping protection on the accessed periodic digital signal and then sending the obtained processed periodic digital signal to the main controller.

Further, the analog voltage signal input module includes: and the third preprocessing unit is used for carrying out voltage division, filtering and clamping protection on the accessed analog voltage signal and then sending the obtained processed analog voltage signal to the main controller.

Further, the electronic product testing apparatus further includes: and a discrete switching signal output module connected to the master controller, the discrete switching signal output module comprising: and the parallel coding units convert the serial signals forwarded by the main controller into discrete switch signals and output the discrete switch signals after receiving the chip selection signals of the main controller.

Further, the electronic product testing apparatus further includes: and a periodic switching signal output module connected to the master controller, the periodic switching signal output module comprising: and the switch driving unit converts the periodic pulse signal with the fixed period and the duty ratio sent by the main controller into a corresponding periodic switching signal and then outputs the periodic switching signal.

Further, the electronic product testing apparatus further includes: a power supply protection module, the power supply protection module comprising: the first conversion unit provides required voltage for the main controller, the discrete digital signal input module, the periodic signal input module, the analog voltage signal input module, the discrete switch signal output module and the periodic switch signal output module; the second conversion unit provides required voltage for the serial communication module.

Further, the power supply protection module further includes: the filter unit filters an accessed direct current power supply to filter static electricity existing in the direct current power supply and shield direct current voltage provided by the direct current power supply under the conditions of reverse connection and overvoltage;

the isolation unit converts the direct-current voltage filtered by the filtering unit into input voltage required by the first conversion unit and the second conversion unit, and provides a grounding point different from that of the first conversion unit for the second conversion unit.

According to the above technical scheme, the utility model provides an electronic product testing device converts the discrete digital signal who inserts into serial signal through discrete digital signal input module when signal reception. And after the periodic signal input module processes the accessed periodic digital signal, the processed periodic digital signal is sent to the main controller. The analog voltage signal input module processes the accessed analog voltage signal, sends the processed analog voltage signal to the main controller, and then the main controller sends various discrete signals and periodic signals to the measurement and control system to realize the reception of various signals. The method changes the mode of simply integrating various interfaces for testing, and effectively reduces the testing cost.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a block diagram of an electronic product testing device provided in accordance with an exemplary embodiment;

FIG. 2 is a block diagram of an electronic product testing device with power protection provided in accordance with an exemplary embodiment;

FIG. 3 is another block diagram of an electronic product testing device provided in accordance with an exemplary embodiment;

FIG. 4 is a circuit diagram of a master provided in accordance with an example embodiment;

FIG. 5 is a dial circuit diagram of serial communications provided in accordance with an exemplary embodiment;

FIG. 6 is a circuit diagram of a serial communications module provided in accordance with an exemplary embodiment;

FIG. 7 is a circuit diagram of a discrete digital signal input module provided in accordance with an exemplary embodiment;

FIG. 8 is a circuit diagram of a pre-processing unit provided in accordance with an exemplary embodiment;

FIG. 9 is a circuit diagram of an interface with a master provided in accordance with an exemplary embodiment;

FIG. 10 is a circuit diagram of an analog voltage signal input module provided in accordance with an exemplary embodiment;

FIG. 11 is a circuit diagram of a discrete switching signal output module provided in accordance with an exemplary embodiment;

FIG. 12 is a circuit diagram of a periodic switching signal output module provided in accordance with an exemplary embodiment;

FIG. 13 is a circuit diagram of a first conversion unit provided in accordance with an exemplary embodiment;

FIG. 14 is a circuit diagram of a second conversion unit provided in accordance with an exemplary embodiment;

FIG. 15 is a circuit diagram of a filter unit provided in accordance with an exemplary embodiment;

fig. 16 is a circuit diagram of an isolation cell provided in accordance with an example embodiment.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1, an embodiment of the present invention provides an electronic product testing apparatus, including: the device comprises a main controller 1, and a serial communication module 5, a discrete digital signal input module 2, a periodic signal input module 3 and an analog voltage signal input module 4 which are respectively connected with the main controller 1.

The main controller 1 is connected with the measurement and control system 6 through a serial communication module 5.

The discrete digital signal input module 2 converts the accessed discrete digital signals into serial signals, then sends the converted serial signals to the main controller 1, and the main controller 1 sends the converted serial signals to the measurement and control system 6.

The periodic signal input module 3 processes the accessed periodic digital signals, and then sends the processed periodic digital signals to the main controller 1, and the main controller 1 sends the processed periodic digital signals to the measurement and control system 6.

The analog voltage signal input module 4 processes the accessed analog voltage signal, sends the processed analog voltage signal to the main controller 1, and sends the processed analog voltage signal to the measurement and control system 6 through the main controller 1.

Specifically, during testing, the main controller 1 and the corresponding interfaces of the measurement and control system 6 are connected through the serial communication module 5, and the side control system 6 and the main controller 1 are communicated in a serial signal mode. When the measurement and control system 6 needs to receive a signal fed back by a device to be measured, the discrete digital signal input module 2 converts the discrete digital signal into a serial signal, the periodic signal input module 3 processes the periodic digital signal and then extracts a corresponding periodic signal, the analog voltage signal input module 4 converts the analog voltage signal into a corresponding digital signal, and finally the master controller 1 converts the signal processed by each input module into a serial signal meeting the serial signal transmission format between the master controller 1 and the measurement and control system 6 and then sends the serial signal to the measurement and control system 6. The acquisition of various serial signals and parallel signals sent by the tested equipment is realized, the limitation of an interface form is avoided, and the receiving and sending of various signals are realized. The method changes the mode of simply integrating various interfaces for testing, and effectively reduces the testing cost.

As a possible implementation manner of the above embodiment, referring to fig. 3, the serial communication module 5 includes: the serial communication chip 51 is used for converting a communication protocol when the main controller 1 communicates with the measurement and control system 6, converting a serial signal sent by the main controller 1 to the measurement and control system 6 into a serial signal of an RS485 protocol, and converting a serial signal sent by the measurement and control system 6 to the main controller 1 into a serial signal of a UART protocol.

The serial communication module 5 further includes: the optical coupler isolator 52 and the optical coupler isolator 52 are connected between the master controller 1 and the serial port communication chip 51.

Specifically, as shown in fig. 4 to 6, a 51-series single chip microcomputer may be used as the main controller 1, an analog signal conversion function (ADC) of the single chip microcomputer is correspondingly connected to the discrete digital signal input module 2 through an SPI interface, a periodic signal acquisition function (IOC) is connected to the periodic signal input module 3, a discrete digital signal input function (SPI communication) is connected to the discrete switch signal output module 7, a periodic digital signal output (PWM) and periodic switch signal output module 8, an analog voltage acquisition function (AD acquisition) is connected to the analog voltage signal input module 4, and serial communication (UART) is used to implement serial signal input and output and serial communication with the measurement and control system. The single chip microcomputer uses an input filter inductor at the input end of the reference power supply so as to reduce the influence of voltage fluctuation on AD data acquisition. The serial communication address setting signal can realize the setting of serial communication network bus addresses (total 8 addresses) through the dial switch shown in fig. 5, so that a plurality of single-chip microcomputers can be used in a cascade connection manner, and the number of the tested devices is increased. The SPI interface can obtain multi-channel discrete acquisition signals through a parallel-to-serial SPI encoder and a serial-to-parallel SPI decoder which are connected with the SPI interface, and does not need to occupy too many wiring pins of a single chip microcomputer. The frequency and duty cycle of a periodic input signal having a range of frequencies can be collected and measured for input of the periodic signal. The periodic digital signal output (PWM) can output periodic square wave signals with given frequency and duty ratio under the control of the singlechip, and the signals are conditioned into corresponding control output signals through a subsequently connected circuit. The analog voltage input port can convert the input analog voltage signal into a corresponding digital signal through analog-digital conversion.

The serial port communication chip 51 is electrically isolated from the main controller 1 through the optical coupler isolator 52, so that when the main controller 1 communicates with the measurement and control system 6, the circuit part directly using the same power supply as the main controller 1 can be prevented from being electrically connected with other networking equipment, and the risk of an uncontrollable potential loop is formed. And the UART signal isolated by the optical coupler is converted into a standard RS485 serial signal form through a serial port communication chip. The common-mode inductor L6 can reduce common-mode interference on an RS485 communication line connected with the measurement and control system, and the pull-up resistor R61, the pull-down resistor R62 and the current-limiting resistors R63 and R64 can reduce the probability of damage to the RS485 differential signal port when the RS485 differential signal port is short-circuited to the ground, the power supply and the power supply. The two TVS diodes D61 and D62 can eliminate static electricity on the communication line. The terminal resistor R65 of the RS485 serial bus can be flexibly configured according to networking use conditions, and generally, a resistor with the resistance value not less than 120 omega can be selected.

The discrete digital signal input module 2 includes:

the device comprises a first preprocessing unit 22 and serial coding units 21, wherein the number of the serial coding units 21 is at least two, and each serial coding unit 21 is connected with two first preprocessing units;

the first preprocessing unit 22 performs voltage division, filtering and clamp protection on the accessed discrete digital signal, and then sends the obtained processed discrete digital signal to the serial encoding unit 21; the serial encoding unit 21 encodes the processed discrete digital signals into corresponding serial signals after receiving the chip selection signal of the master 1.

Referring to fig. 7 to 9, IN fig. 8, the preprocessing circuit inside the first preprocessing unit 22 IN fig. 7 is shown, after voltages IN1 and IN2 input by a device under test are divided by resistors R81 and R82, and R83 and R84, respectively, and capacitors C81 and C82 filter, and diodes D81 and D82 clamp overvoltage protection, output signals corresponding to interfaces a and B are formed, then each signal enters the serial encoding unit, and an SPI code stream output by the last serial encoding unit and communicated with the master is sent to the master controller 1 through the SPI interface described IN fig. 9, where the resistors R91, R92, R93, and R94 are voltage limiting resistors and sent to the master controller 1 through corresponding pins connected with the master controller 1, so that external multiple discrete digital signal inputs become serial data for transmission.

The periodic signal input module 3 includes: and the second preprocessing unit 31, after the second preprocessing unit 31 performs voltage division, filtering and clamping protection on the accessed periodic digital signal, sends the obtained processed periodic digital signal to the master controller.

In specific implementation, the second preprocessing unit 31 may have the same structure as the first preprocessing unit 22, and directly inputs the externally input periodic voltage signal to a corresponding pin of the single chip microcomputer after resistor voltage division, capacitor filtering and diode clamp overvoltage protection, and the frequency and duty ratio data of the input signal are obtained by measurement of the single chip microcomputer.

The analog voltage signal input module includes: and the third preprocessing unit 41 is configured to perform voltage division, filtering and clamp protection on the accessed analog voltage signal, and then send the processed analog voltage signal to the master controller.

Referring to fig. 10, the voltage input by the device under test is divided and filtered by the RC network formed by the resistor and the capacitor, and then directly output to the analog voltage acquisition port of the single chip, and processed by the analog-digital conversion circuit inside the single chip, so as to obtain the measurement data of the voltage. The voltage of the first path is divided by the resistor R101 and the resistor R103, filtered by the capacitor C101, clamped and divided by the diodes D101 and D102, and input into the main controller, and similarly, the voltage of the second path is divided by the resistor R102 and the resistor R104, filtered by the capacitor C102, clamped and divided by the diodes D101 and D102, and input into the main controller.

In some embodiments of the present invention, referring to fig. 2, when the measurement and control system 6 sends the serial signal or the periodic pulse signal required by the test, the main controller 1 converts the serial signal into the discrete switch signal through the discrete switch signal output module 7 and then sends the discrete switch signal to the device to be tested, so as to control the device to be tested with the discrete switch signal. When the measurement and control system 6 needs to send periodic switching signals, the main controller 1 converts the periodic pulse signals sent by the measurement and control system into corresponding periodic switching signals through the periodic switching output module 8, and controls the tested equipment. Therefore, the control signals of the measurement and control system can be sent in a serial or parallel mode, and most test control requirements can be met.

The discrete switching signal output module 7 includes: and the parallel coding units 71 convert the serial signals forwarded by the master controller 1 into discrete switching signals after receiving the chip selection signals of the master controller.

Referring to fig. 11, four parallel encoding units may be connected to a single chip microcomputer in a cascade manner, the single chip microcomputer sends serial encoding data to be output to each parallel encoding unit through an SPI interface, and the parallel encoding units encode the serial encoding data to form a plurality of paths of discrete switching signals for output. The parallel encoder can protect the conditions of short circuit, overload and the like on the parallel output side while decoding serial data, and avoids the influence on the single chip microcomputer.

The periodic switching signal output module 8 includes: and the switch driving unit 81 is used for converting the periodic pulse signal with the fixed period and the duty ratio sent by the main controller into a corresponding periodic switching signal and then outputting the periodic switching signal.

Referring to fig. 12, a periodic digital signal output port of the single chip outputs a square wave signal with a specific frequency and a specific duty ratio under an instruction of the single chip, and the square wave signal switch driving unit can form a periodic switch signal output after processing. Meanwhile, the switch driving unit has the functions of short-circuit protection and overcurrent protection, and can protect the single chip microcomputer when the current is abnormal. The square wave signal output by the single chip microcomputer is input through pins 2 and 3 of the switch driving unit, and the high-level or low-level switch signal is correspondingly output through pins 6 and 7 after the square wave signal is identified and integrated by the switch driving unit.

To further optimize the technical solution, referring to fig. 2 and fig. 3, in some embodiments of the present invention, the electronic product testing apparatus further includes: power supply protection module 9, power supply protection module 9 includes: the first conversion unit 91 provides required voltage for the main controller, the discrete digital signal input module, the periodic signal input module, the analog voltage signal input module, the discrete switch signal output module and the periodic switch signal output module; the second conversion unit 92 provides the required voltage for the serial communication module.

The power supply protection module further includes: the filter unit 94 and the isolation unit 93, the filter unit 94 filters the accessed direct current power supply to filter static electricity existing in the direct current power supply and shield direct current voltage provided by the direct current power supply under reverse connection and overvoltage conditions;

the isolation unit 93 converts the dc voltage filtered by the filtering unit 94 into input voltages required by the first conversion unit 91 and the second conversion unit 92, and provides a different ground point from that of the first conversion unit 91 to the second conversion unit 92.

Specifically, referring to fig. 13 to 16, after the dc power supply is connected, the filtering unit shown in fig. 15 is used to perform power input anti-static, anti-reverse connection and overvoltage protection, where V _ PWR is an access point of the dc power supply, and can receive 0 to 40V dc voltage after being processed by the FUSE. The voltage is 18-24V when the module works normally, and when the connected direct current voltage is overvoltage or reversely connected, the module enters a protection state and cannot provide voltage for other modules. A TVS diode D151 for preventing static electricity is also provided at the inlet of the dc power supply. The reverse-connection-preventing circuit is formed by resistors R151, R152, R153, R154 and R155, diodes D152 and D153, a capacitor C151 and triodes Q1, Q2 and Q3, wherein the triodes Q1 and Q2 are NPN type, Q3 is PNP type, the diode D152 is conducted when the access voltage is normal, the D153 is cut off, at the moment, the triode Q1 is in a cut-off state, the base electrode of the triode Q2 is conducted after voltage division is carried out by the resistors R153 and R155, and therefore the voltage of the base electrode of the triode Q3 is reduced to conduct the triode Q3 and power supply is carried out normally. And when the access power supply is reversely connected, the D152 is conducted, the D153 is conducted, and at the moment, the triode Q1 is in a conducting state, so that the base voltage of the triode Q2 is pulled down to enable the Q2 not to be conducted, the voltage of the base of the triode Q3 is higher, the triode Q3 cannot be conducted, and the power supply is cut off.

After the direct-current voltage is protected by the filtering unit, the direct-current voltage enters the isolation unit shown in fig. 16 to convert the 18-24V direct current input by the filtering unit into 9V direct current VCC90, and the ground loop GND _ PWR of the input power supply of the whole device is isolated from the ground loop GND of the working power supply of the device, so that the risk of forming a potential loop to damage a circuit when the direct-current voltage is used in a networking mode with other equipment can be reduced. In the power supply part, two LDO chips as shown in fig. 13 and fig. 14 may be used for supplying power after conversion, wherein one of the two LDO chips steps down the isolated voltage to obtain a 5V voltage output by the VCC50 interface as the power supply of the master controller and each conversion module. And the other one of the two circuits reduces the voltage after the isolation to obtain 5V voltage output by the VDD50 interface as a power supply of the serial communication module. The input voltage is filtered by a filter circuit formed by capacitors C161, C162, C163, C164 and an inductor and then input into the isolation unit, the voltage after isolation conversion is filtered by a capacitor C166 and then output to provide power, wherein the C165 plays a role in filtering and converting noise waves. The resistor R161 and the light emitting diode D161 function as a light emitting indicator.

In the LDO chip shown in fig. 13, the capacitor C131 connected between pins 1 and 3 functions as a filter, and the capacitor C132 connected between pins 2 and 3 functions as a regulator; the LDO chip shown in fig. 14 is a 5-pin type, in which R141 plays a role of voltage division, C141 plays a role of filtering, and C142Q plays a role of filtering noise of the output voltage.

It can be understood that the chip in each module of the above embodiments of the present invention all adopts components known to those skilled in the art, and the present invention is not described herein again.

The utility model provides an electronic product testing device can realize the collection and output switch signal's control to a large amount of input digit analog signal with simple and reliable form and lower cost, has greatly reduced electronic product testing device's the realization degree of difficulty and spending, has improved the degree of automation that experimental observing and controlling was equipped.

It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The utility model discloses module and submodule piece in the device and the terminal of each embodiment can merge, divide and subtract according to actual need, and the characteristic of record can be replaced or the combination in each embodiment.

In the embodiments provided in the present invention, it should be understood that the disclosed terminal, device, can be implemented in other manners. For example, a module or sub-module may be divided into only one logical function, and an actual implementation may have another division, for example, multiple sub-modules or modules may be combined or integrated into another module, or some features may be omitted, or not executed. In addition, the shown or discussed coupling or direct coupling or communication connection between each other may be through some interfaces, indirect coupling or communication connection between devices or modules, and may be in an electrical, mechanical or other form.

The modules or sub-modules described as separate parts may or may not be physically separate, and parts that are modules or sub-modules may or may not be physical modules or sub-modules, may be located in one place, or may be distributed over a plurality of network modules or sub-modules. Some or all of the modules or sub-modules can be selected according to actual needs to achieve the purpose of the solution of the present embodiment.

In addition, each functional module or sub-module in the embodiments of the present invention may be integrated into one processing module, or each module or sub-module may exist alone physically, or two or more modules or sub-modules may be integrated into one module.

Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of additional like elements in the article or device comprising the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. An electronic product testing device, comprising: the system comprises a main controller, a serial communication module, a discrete digital signal input module, a periodic signal input module and an analog voltage signal input module, wherein the serial communication module, the discrete digital signal input module, the periodic signal input module and the analog voltage signal input module are respectively connected with the main controller;

the main controller is connected with the measurement and control system through the serial communication module;

the discrete digital signal input module converts an accessed discrete digital signal into a serial signal, then sends the converted serial signal to the main controller, and the main controller sends the converted serial signal to the measurement and control system;

the periodic signal input module processes the accessed periodic digital signals, and then sends the processed periodic digital signals to the main controller, and the main controller sends the processed periodic digital signals to the measurement and control system;

the analog voltage signal input module processes the accessed analog voltage signal, and then sends the processed analog voltage signal to the main controller, and the main controller sends the processed analog voltage signal to the measurement and control system.

2. The apparatus of claim 1, wherein the serial communication module comprises: the serial port communication chip is used for converting a communication protocol when the main controller communicates with the measurement and control system, converting serial signals sent by the main controller to the measurement and control system into serial signals of an RS485 protocol, and converting serial signals sent by the measurement and control system to the main controller into serial signals of a UART protocol.

3. The apparatus of claim 2, wherein the serial communication module further comprises: and the optical coupler isolator is connected between the main controller and the serial port communication chip.

4. The apparatus of claim 1, wherein the discrete digital signal input module comprises:

the device comprises a first preprocessing unit and serial coding units, wherein the number of the serial coding units is at least two, and each serial coding unit is connected with two first preprocessing units;

the first preprocessing unit carries out voltage division, filtering and clamping protection on the accessed discrete digital signal and then sends the obtained processed discrete digital signal to the serial coding unit;

and after receiving the chip selection signal of the main controller, the serial coding unit codes the processed discrete digital signal into a corresponding serial signal.

5. The apparatus of claim 1, wherein the periodic signal input module comprises: and the second preprocessing unit is used for carrying out voltage division, filtering and clamping protection on the accessed periodic digital signal and then sending the obtained processed periodic digital signal to the main controller.

6. The apparatus of claim 1, wherein the analog voltage signal input module comprises: and the third preprocessing unit is used for carrying out voltage division, filtering and clamping protection on the accessed analog voltage signal and then sending the obtained processed analog voltage signal to the main controller.

7. The apparatus of claim 1, further comprising: and a discrete switching signal output module connected to the master controller, the discrete switching signal output module comprising: and the parallel coding units convert the serial signals forwarded by the main controller into discrete switch signals and output the discrete switch signals after receiving the chip selection signals of the main controller.

8. The apparatus of claim 7, further comprising: and a periodic switching signal output module connected to the master controller, the periodic switching signal output module comprising: and the switch driving unit converts the periodic pulse signal with fixed period and duty ratio sent by the main controller into a corresponding periodic switching signal and then outputs the periodic switching signal.

9. The apparatus of claim 8, further comprising: a power supply protection module, the power supply protection module comprising: the first conversion unit provides required voltage for the main controller, the discrete digital signal input module, the periodic signal input module, the analog voltage signal input module, the discrete switch signal output module and the periodic switch signal output module; the second conversion unit provides required voltage for the serial communication module.

10. The apparatus of claim 9, wherein the power protection module further comprises: the filter unit filters an accessed direct current power supply to filter static electricity existing in the direct current power supply and shield direct current voltage provided by the direct current power supply under the conditions of reverse connection and overvoltage;

the isolation unit converts the direct-current voltage filtered by the filtering unit into input voltage required by the first conversion unit and the second conversion unit, and provides a grounding point different from that of the first conversion unit for the second conversion unit.

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