CN213715728U - Digital sensor acquisition device - Google Patents

Abstract

The utility model provides a digital sensor collection system, include: the system comprises a main controller, a power supply module, a digital sensor interface and a magnetic coupler, wherein the input end of an isolation transformer in the power supply module is connected with an external power supply through a networking communication interface, and the output end of the isolation transformer is connected with the input end of a POE power-taking circuit; the output end of the POE power taking circuit is connected with the input end of the power circuit, and the output end of the power circuit is connected with each power supply port inside the digital sensor acquisition device; the digital sensor interface is connected with the main controller through a magnetic coupler. This digital sensor collection system can get the electric circuit to supply power to whole digital sensor collection system based on POE, has simplified digital sensor collection system's construction wiring, has improved the interference killing feature, has saved area, has saved manufacturing cost simultaneously, and POE gets the hot plug of electric circuit, overhauls, changes and need not the power failure operation, can not influence the normal operating of other equipment.

Description

Digital sensor acquisition device

Technical Field

The utility model relates to an automatic technical field especially relates to a digital sensor collection system.

Background

In recent years, automatic Control systems in traditional sewage treatment plants have been rapidly developed, and Distributed automatic Control systems have been gradually applied in the industry in addition to Distributed Control Systems (DCS) which are commonly built by Programmable Logic Controllers (PLC).

In a distributed automatic control system in the prior art, a set of digital sensor acquisition device is generally configured for each controlled device, so that the controlled device can implement data digitization locally. The digital sensor acquisition device in the system is connected with a plurality of different power supply sources in order to meet the power consumption requirements of each data acquisition module.

However, since the digital sensor acquisition device is installed in a distributed manner, the digital sensor acquisition device has to adopt a 220V power supply mode, and the power consumption voltages of the modules in the device are different, so that a large number of power cables need to be laid for the digital sensor acquisition device, and the power-off debugging or replacement process is complicated. Therefore, a digital sensor acquisition device with simple wiring is urgently needed, and has important significance for saving the manufacturing cost.

SUMMERY OF THE UTILITY MODEL

The utility model provides a digital sensor collection system to solve the digital sensor collection system among the prior art defect such as wiring complicacy.

The utility model provides a digital sensor collection system, include: main control unit, power supply module, digital sensor interface and magnetic coupling, the power supply module includes: the power supply system comprises an isolation transformer, a POE power-taking circuit, a networking communication interface and a power supply circuit;

the input end of the isolation transformer is connected with an external power supply through a networking communication interface, and the output end of the isolation transformer is connected with the input end of the POE power taking circuit; the output end of the POE power taking circuit is connected with the input end of the power circuit, and the output end of the power circuit is connected with each power supply port inside the digital sensor acquisition device;

the digital sensor interface is connected with the main controller through the magnetic coupler.

Optionally, the POE power-taking circuit includes a POE power-taking module;

the input of POE gets the electric module with isolation transformer's output is connected, the output with power supply circuit's input is connected.

Optionally, the POE power-taking module is a WC-PD30D240LV module.

Optionally, the POE power taking circuit further includes an anti-interference circuit;

the input end of the anti-interference circuit is connected with the output end of the POE power taking module, and the output end of the anti-interference circuit is connected with the input end of the power circuit;

the anti-interference circuit comprises an inductor and a safety capacitor.

Optionally, the power supply circuit includes a first power supply circuit and a second power supply circuit;

the first power supply circuit comprises an isolation voltage-reducing chip, the input end of the isolation voltage-reducing chip is connected with the output end of the POE power-taking circuit, and the output end of the isolation voltage-reducing chip is respectively connected with the input end of the second power supply circuit and each first power supply port inside the digital sensor acquisition device;

the second power supply circuit comprises a voltage stabilizing chip, the input end of the voltage stabilizing chip is connected with the output end of the isolation voltage-reducing chip, and the output end of the voltage stabilizing chip is connected with each second power supply port in the digital sensor acquisition device;

wherein the first power supply port and the first power supply port use different power voltages.

Optionally, the apparatus further comprises: a peripheral circuit electrically connected to the host controller, the peripheral circuit comprising: a reset circuit and a watchdog circuit.

Optionally, the apparatus further comprises: digital quantity acquisition module, digital quantity acquisition module includes: the switching value output circuit comprises a first switching value input port, a switching value output port, a first optical coupler, a driving circuit, a second optical coupler and a relay;

the input end of the first optical coupler is connected with the first switching value input port, and the output end of the first optical coupler is connected with the main controller;

the input end of the second optical coupler is respectively connected with the output ends of the main controller and the driving circuit, and the output end of the second optical coupler is connected with the input end of the relay;

the input end of the driving circuit is connected with the main controller;

and the output end of the relay is connected with the switching value output port.

Optionally, the apparatus further comprises: analog quantity acquisition module, analog quantity acquisition module includes: the device comprises an expansion interface, a first signal conditioning circuit, an analog input port, a second signal conditioning circuit, a signal isolation circuit and an analog output port;

the analog input port is connected with the main controller sequentially through the first signal conditioning circuit and the expansion interface;

the main controller is connected with the analog quantity output port sequentially through the expansion interface, the second signal conditioning circuit and the signal isolation circuit.

Optionally, the analog quantity acquisition module further includes: a third optical coupler and a second switching value input port;

and the second switching value input port is connected with the main controller sequentially through the third optical coupler and the expansion interface.

Optionally, the apparatus further comprises: a physical layer chip;

the input end of the physical layer chip is connected with the output end of the isolation transformer, and the output end of the physical layer chip is connected with the main controller.

The utility model discloses technical scheme has following advantage:

the utility model provides a digital sensor collection system, include: main control unit, power supply module, digital sensor interface and magnetic coupling, the power supply module includes: the power supply system comprises an isolation transformer, a POE power-taking circuit, a networking communication interface and a power supply circuit; the input end of the isolation transformer is connected with an external power supply through a networking communication interface, and the output end of the isolation transformer is connected with the input end of the POE power taking circuit; the output end of the POE power taking circuit is connected with the input end of the power circuit, and the output end of the power circuit is connected with each power supply port inside the digital sensor acquisition device; the digital sensor interface is connected with the main controller through a magnetic coupler. The digital sensor collection system that above-mentioned scheme provided can get the electric circuit based on POE and supply power to whole digital sensor collection system, has simplified digital sensor collection system's construction wiring, has improved the interference killing feature, has saved area, has saved manufacturing cost simultaneously, and POE gets the hot plug of electric circuit, overhauls, changes and need not the power failure operation, can not influence the normal operating of other equipment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art according to these drawings.

Fig. 1 is a schematic structural diagram of a digital sensor acquisition device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a POE power taking circuit provided in an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a power supply module according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of an isolation transformer according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a main controller according to an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a digital quantity acquisition module according to an embodiment of the present invention;

fig. 7 is a schematic structural diagram of an expansion interface according to an embodiment of the present invention;

fig. 8 is a schematic structural diagram of a first signal conditioning circuit according to an embodiment of the present invention;

fig. 9 is a schematic structural diagram of a second signal conditioning circuit and a signal isolation circuit according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a physical layer chip according to an embodiment of the present invention.

With the above figures, certain embodiments of the present invention have been shown and described in more detail below. The drawings and written description are not intended to limit the scope of the disclosed concepts in any way, but rather to illustrate the concepts of the invention by those skilled in the art with reference to specific embodiments.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the following examples, "plurality" means two or more unless specifically limited otherwise.

In a distributed automatic control system in the prior art, a set of digital sensor acquisition device is generally configured for each controlled device, so that the controlled device can implement data digitization locally. The digital sensor acquisition device in the system is connected with a plurality of different power supply sources in order to meet the power consumption requirements of each data acquisition module. However, since the digital sensor acquisition device is installed in a distributed manner, the digital sensor acquisition device has to adopt a 220V power supply mode, and the power consumption voltages of the modules in the device are different, so that a large number of power cables need to be laid for the digital sensor acquisition device, and the power-off debugging or replacement process is complicated.

To the above problem, the embodiment of the utility model provides a digital sensor collection system, include: main control unit, power supply module, digital sensor interface and magnetic coupling, the power supply module includes: the power supply system comprises an isolation transformer, a POE power-taking circuit, a networking communication interface and a power supply circuit; the input end of the isolation transformer is connected with an external power supply through a networking communication interface, and the output end of the isolation transformer is connected with the input end of the POE power taking circuit; the output end of the POE power taking circuit is connected with the input end of the power circuit, and the output end of the power circuit is connected with each power supply port inside the digital sensor acquisition device; the digital sensor interface is connected with the main controller through a magnetic coupler. The digital sensor collection system that above-mentioned scheme provided can get the electric circuit based on POE and supply power to whole digital sensor collection system, has simplified digital sensor collection system's construction wiring, has improved the interference killing feature, has saved area, has saved manufacturing cost simultaneously, and POE gets the hot plug of electric circuit, overhauls, changes and need not the power failure operation, can not influence the normal operating of other equipment.

The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present invention will be described with reference to the accompanying drawings.

The embodiment of the utility model provides a digital sensor collection system installs in distributing type automatic control system.

As shown in fig. 1, for the structure schematic diagram of the digital sensor collecting device provided by the embodiment of the present invention, the device 10 includes: power supply module 101, power supply module 101 includes: isolation transformer, POE get electric circuit, network deployment communication interface and power supply circuit.

The input end of the isolation transformer is connected with an external power supply through a networking communication interface, and the output end of the isolation transformer is connected with the input end of the POE power taking circuit; the output of POE gets the electric circuit and is connected with power supply circuit's input, and power supply circuit's output and each power supply port inside the digital sensor collection system are connected.

Specifically, in an embodiment, as shown in fig. 2, the POE power taking circuit includes a POE power taking module CN 3.

Wherein, POE gets input and the output of power module CN3 is connected with isolation transformer, and the output is connected with power supply circuit's input.

Specifically, in an embodiment, as shown in fig. 2, for the embodiment of the present invention provides a POE power taking circuit's schematic structure diagram. As an implementation manner, on the basis of the above embodiment, in an embodiment, the POE power module CN3 is a WC-PD30D240LV module.

Specifically, in an embodiment, as shown in fig. 2, the POE power taking circuit further includes an anti-interference circuit.

The input end of the anti-interference circuit is connected with the output end of the POE power taking module CN3, and the output end of the anti-interference circuit is connected with the input end of the power supply circuit; the anti-jamming circuit comprises an inductor L9 and a safety capacitor (C47 and C5).

As shown in fig. 3, it is a schematic structural diagram of a power supply module according to an embodiment of the present invention. As a practical manner, on the basis of the above-described embodiments, in an embodiment, the power supply circuit includes a first power supply circuit and a second power supply circuit.

The first power supply circuit comprises an isolation voltage reduction chip U4, the input end of the isolation voltage reduction chip U4 is connected with the output end of the POE power taking circuit, and the output end of the isolation voltage reduction chip U4 is connected with the input end of the second power supply circuit and each first power supply port in the digital sensor acquisition device respectively; the second power supply circuit comprises a voltage stabilizing chip U5, the input end of a voltage stabilizing chip U5 is connected with the output end of an isolation voltage-reducing chip U4, and the output end of the voltage stabilizing chip U5 is connected with each second power supply port in the digital sensor acquisition device; the first power supply port and the first power supply port are different in power utilization voltage.

Specifically, as shown in fig. 3, the power supply module 101 generates a total of 1 dc 24V power, 1 isolated 5V power, 1 3.3V power for the digital acquisition module 103, and 1 3.3V power for the analog acquisition module 104. The power supply enters the device through the networking communication interface, and enters the POE power taking circuit after being separated by the Ethernet transformer HY60168EE (isolation transformer). The device has adopted WC-PD30D240LV module to get the POE in the circuit as POE and has got electric module CN3, and this module supports IEEE802.3 AF/AT standard protocol, can accept hundred million POE and giga POE signals, and operating temperature reaches-40 ℃ to 85 ℃, satisfies multiple operating mode demand. The power supply passing through the POE power taking module CN3 is finally output in a 24V direct current mode, enters an inductor FL2D-Z5-103 (namely an inductor L9) to remove common mode interference, and then differential mode interference is removed through a safety capacitor (C47 and C5), so that EMC treatment is completed. After EMC treatment is completed, a 2W isolated 5V power supply is output to be used by other modules in the device through an isolated buck chip B2405S-2WR2 (namely, an isolated buck chip U4), and two paths of 3.3V power supplies are generated through a voltage stabilizing chip LM1117-3.3 (namely, a voltage stabilizing chip U5) at the rear stage (a second power supply circuit).

Exemplarily, as shown in fig. 4, for the structural schematic diagram of the isolation transformer provided by the embodiment of the present invention, wherein, the isolation transformer L4 can filter the differential signal transmitted from the physical layer chip by using the differential mode coupled coil coupling to enhance the signal, and couple the differential signal to the network device connected to the networking communication interface through the conversion of the electromagnetic field, so that not only the signal is transmitted between the networking communication interface and the physical layer chip without physical connection, but also the dc component in the signal is cut off, data can be transmitted in devices with different 0V levels, and meanwhile, the isolation transformer L4 also plays a role of lightning protection induction protection, and can prevent the physical layer chip and the main controller 102 from being burned out in thunderstorm weather.

Specifically, in one embodiment, as shown in fig. 1, the apparatus further includes: a main controller 102 and a peripheral circuit 1021 electrically connected to the main controller 102, the peripheral circuit 1021 including: a reset circuit and a watchdog circuit.

Exemplarily, as shown in fig. 5, a schematic structural diagram of a main controller provided in an embodiment of the present invention is shown. The device can adopt STM32F407 of ARM Cortex-M3 kernel as the main control chip in the main controller 102, the main controller 102 comprises a program programming interface, an external watchdog circuit, a reset circuit, a clock circuit, a main control chip power circuit and the like, an external expansion port provides a 2x10 connector, 16 chip pins are expanded, and a common IO port, a UART port, an ADC port and a DAC port are covered.

Wherein, as shown in fig. 1, the apparatus further comprises: digital quantity acquisition module 103, digital quantity acquisition module 103 includes: the switching value output circuit comprises a first switching value input port, a switching value output port, a first optical coupler, a driving circuit, a second optical coupler and a relay.

As shown in fig. 6, the input end of the first optical coupler (U1 and U7) is connected to the first switching value input port, and the output end is connected to the main controller 102; the input ends of the second optocouplers (U10, U14 and U15) are respectively connected with the output ends of the main controller 102 and the drive circuit, and the output ends are connected with the input ends of the relays (K1 and K3); the input end of the driving circuit is connected with the main controller 102; the output ends of the relays (K1 and K3) are connected with the switching value output port.

It should be explained that the digital quantity acquisition module can also be called as a switching quantity acquisition module.

Exemplarily, as shown in fig. 6, a schematic structural diagram of a digital quantity acquisition module provided by an embodiment of the present invention is shown.

Specifically, the first switching value input port supports an on signal between 0 and 30V, and the device considers the on signal to be low when the on signal is less than 10V and high when the on signal is greater than 10V. When the open signal is at high level, the signal passes through the current-limiting resistor and then passes through the serially connected Zener diode MMSZ5240BT1G to enter the post-stage circuit, and due to the reverse breakdown characteristic of the Zener diode, the open signal can be ensured to be non-conductive when less than 10V and conductive when more than 10V. After the signal is conducted, the signal is isolated by the first optical coupler (U1 and U7) and then is transmitted to the pin of the main control chip. The switching value output port is used for controlling the output of the relays (K1 and K3) to generate a pair of passive nodes outwards. The master control chip controls the action of the relays (K1 and K3) after passing through the second optical couplers (U10, U14 and U15) by changing the high-low level state of the pins. In order to effectively prevent misoperation when the device is started or reset, two pins are independently selected by the device as power supplies of the optical couplers, and the switching value can be effectively output only when the pin level of the control power supply and the level of the output pin are correct.

The device adopts an Ethernet communication protocol, the main control chip provides an Ethernet controller, two pairs of differential signals are output through the Ethernet controller, and the two pairs of differential signals pass through an Ethernet transformer and are connected with a switch through an RJ45 interface (networking communication interface). The networking communication interface is an Ethernet communication interface.

Specifically, in one embodiment, as shown in fig. 1, the apparatus further includes: analog quantity acquisition module 104, analog quantity acquisition module 104 includes: the device comprises an expansion interface, a first signal conditioning circuit, an analog input port, a third optical coupler, a second switching value input port, a second signal conditioning circuit, a signal isolation circuit and an analog output port.

Exemplarily, as shown in fig. 7, a schematic structural diagram of an expansion interface provided by an embodiment of the present invention is, as shown in fig. 8, a schematic structural diagram of a first signal conditioning circuit provided by an embodiment of the present invention is, as shown in fig. 9, a schematic structural diagram of a second signal conditioning circuit and a signal isolation circuit provided by an embodiment of the present invention.

As shown in fig. 7 to 9, the analog input port is connected to the main controller 102 sequentially through the first signal conditioning circuit and the expansion interface H1; the second switching value input port is connected with the main controller 102 sequentially through the third optical coupler and the expansion interface H1; the main controller 102 is connected to the analog output port through the expansion interface H1, the second signal conditioning circuit and the signal isolation circuit M1 in sequence.

Specifically, the first signal conditioning circuit can convert the 4-20mA current signal into a 0-3V voltage signal, and then the 0-3V voltage signal is buffered by the operational amplifier and input to the main controller 102. Furthermore, the analog input port is a 4-channel analog acquisition interface, and can acquire 4 channels of analog signals at most. Specifically, when the controlled device is controlled, the DAC pin of the main controller 102 generates a voltage signal of 0-3.125V, and then the voltage signal is conditioned into a voltage signal of 0-5V by the second signal conditioning circuit, and the voltage signal is converted into a current of 0-20mA by the isolation transmitter and finally output to the controlled device.

The working principle of the second switching value input port and the third optical coupler in the analog value acquisition module 104 is the same as that of the digital value acquisition module 103, and are not described herein again.

It should be explained that, the embodiment of the present invention provides an analog quantity acquisition module, wherein the second switch quantity input port and the third optical coupler are disposed in the analog quantity acquisition module, and the extension module is disposed in the analog quantity acquisition module.

Specifically, in one embodiment, as shown in fig. 1, the apparatus further comprises: a digital sensor interface 105 and a magnetic coupler 106.

Wherein the digital sensor interface 105 is connected to the main controller 102 via a magnetic coupling 106.

Specifically, the digital sensor interface 105 protocol supports MODBUS by default, SP485 can be used as a transceiver, a TVS tube is used for EMC control before a signal is connected to the digital sensor interface 105, and the signal enters the UART port of the main control chip through the magnetic coupler 106 after passing through the digital sensor interface 105.

Specifically, after the device is operated, the cut-in signal and the analog quantity signal are continuously collected (hardware is realized through expansion), and are released to the Ethernet in real time through the Ethernet. Meanwhile, the device also utilizes the digital sensor interface 105 to receive effective data in the Ethernet in real time, and controls the output of relays (K1 and K3) and the output of analog quantity (hardware is realized by expansion) according to data control output quantity through data analysis. In order to enable the digital sensor interface 105 to read various data, the device can also work in a transparent transmission mode in addition to processing the default MODBUS protocol, so that the protocol analysis work is transferred to the higher-level control equipment.

Specifically, in one embodiment, as shown in fig. 1, the apparatus further includes: and a physical layer chip.

The input end of the physical layer chip is connected to the output end of the isolation transformer, and the output end is connected to the main controller 102.

Specifically, as shown in fig. 10, a schematic structural diagram of a physical layer chip provided in the embodiment of the present invention is provided, wherein the physical layer chip U6 defines electrical and optical signals, line states, clock references, data codes and circuits, etc. required for data transmission and reception, and provides a standard interface for data link layer devices. When sending data, that is, when sending data transmitted by the main controller 102 to the networking communication interface, the physical layer chip U6 receives the data from the main controller 102, converts the parallel data into serial stream data, encodes the data according to the encoding rule of the physical layer, and finally converts the encoded data into an analog signal and outputs the analog signal. On the contrary, the flow of the physical layer chip U6 when receiving data, the physical layer chip U6 may also implement part of the function of CSMA/CD, and during operation, the physical layer chip U6 may detect whether there is data on the network being transmitted, wait if there is data on the network being transmitted, and once detecting that the network is idle, wait for a random time before sending the data.

The digital sensor acquisition device provides 7 paths of switching value input acquisition, 2 paths of switching value output control, 1 path of RS485 communication interface (digital sensor interface) and one path of POE (Ethernet networking communication interface), and 4 paths of 4-20mA analog output ports, 1 path of 4-20mA analog output ports and 4 paths of switching value input ports can be expanded on the basis through the expansion interface. Various controlled equipment requirements can be met through the interfaces.

The embodiment of the utility model provides a digital sensor collection system, include: main control unit, power supply module, digital sensor interface and magnetic coupling, the power supply module includes: the power supply system comprises an isolation transformer, a POE power-taking circuit, a networking communication interface and a power supply circuit; the input end of the isolation transformer is connected with an external power supply through a networking communication interface, and the output end of the isolation transformer is connected with the input end of the POE power taking circuit; the output end of the POE power taking circuit is connected with the input end of the power circuit, and the output end of the power circuit is connected with each power supply port inside the digital sensor acquisition device; the digital sensor interface is connected with the main controller through a magnetic coupler. The digital sensor collection system that above-mentioned scheme provided can get the electric circuit based on POE and supply power to whole digital sensor collection system, has simplified digital sensor collection system's construction wiring, has improved the interference killing feature, has saved area, has saved manufacturing cost simultaneously, and POE gets the hot plug of electric circuit, overhauls, changes and need not the power failure operation, can not influence the normal operating of other equipment. And the device adopts the Ethernet as a transmission medium, and has high response speed.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.

Claims (10)

1. A digital sensor acquisition device, comprising: main control unit, power supply module, digital sensor interface and magnetic coupling, the power supply module includes: the power supply system comprises an isolation transformer, a POE power-taking circuit, a networking communication interface and a power supply circuit;

the input end of the isolation transformer is connected with an external power supply through a networking communication interface, and the output end of the isolation transformer is connected with the input end of the POE power taking circuit; the output end of the POE power taking circuit is connected with the input end of the power circuit, and the output end of the power circuit is connected with each power supply port inside the digital sensor acquisition device;

the digital sensor interface is connected with the main controller through the magnetic coupler.

2. The digital sensor acquisition device according to claim 1, wherein the POE power-taking circuit comprises a POE power-taking module;

the input of POE gets the electric module with isolation transformer's output is connected, the output with power supply circuit's input is connected.

3. The digital sensor acquisition device as claimed in claim 2, wherein the POE power-taking module is a WC-PD30D240LV module.

4. The digital sensor acquisition device according to claim 2, wherein the POE power-taking circuit further comprises an anti-jamming circuit;

the input end of the anti-interference circuit is connected with the output end of the POE power taking module, and the output end of the anti-interference circuit is connected with the input end of the power circuit;

the anti-interference circuit comprises an inductor and a safety capacitor.

5. The digital sensor acquisition device of claim 1 wherein the power circuit comprises a first power circuit and a second power circuit;

the first power supply circuit comprises an isolation voltage-reducing chip, the input end of the isolation voltage-reducing chip is connected with the output end of the POE power-taking circuit, and the output end of the isolation voltage-reducing chip is respectively connected with the input end of the second power supply circuit and each first power supply port inside the digital sensor acquisition device;

the second power supply circuit comprises a voltage stabilizing chip, the input end of the voltage stabilizing chip is connected with the output end of the isolation voltage-reducing chip, and the output end of the voltage stabilizing chip is connected with each second power supply port in the digital sensor acquisition device;

wherein the first power supply port and the first power supply port use different power voltages.

6. The digital sensor acquisition device of claim 1, wherein the device further comprises: a peripheral circuit electrically connected to the host controller, the peripheral circuit comprising: a reset circuit and a watchdog circuit.

7. The digital sensor acquisition device of claim 6, wherein the device further comprises: digital quantity acquisition module, digital quantity acquisition module includes: the switching value output circuit comprises a first switching value input port, a switching value output port, a first optical coupler, a driving circuit, a second optical coupler and a relay;

the input end of the first optical coupler is connected with the first switching value input port, and the output end of the first optical coupler is connected with the main controller;

the input end of the second optical coupler is respectively connected with the output ends of the main controller and the driving circuit, and the output end of the second optical coupler is connected with the input end of the relay;

the input end of the driving circuit is connected with the main controller;

and the output end of the relay is connected with the switching value output port.

8. The digital sensor acquisition device of claim 1, wherein the device further comprises: analog quantity acquisition module, analog quantity acquisition module includes: the device comprises an expansion interface, a first signal conditioning circuit, an analog input port, a second signal conditioning circuit, a signal isolation circuit and an analog output port;

the analog input port is connected with the main controller sequentially through the first signal conditioning circuit and the expansion interface;

the main controller is connected with the analog quantity output port sequentially through the expansion interface, the second signal conditioning circuit and the signal isolation circuit.

9. The digital sensor acquisition device of claim 8, wherein the analog acquisition module further comprises: a third optical coupler and a second switching value input port;

and the second switching value input port is connected with the main controller sequentially through the third optical coupler and the expansion interface.

10. The digital sensor acquisition device of claim 1, wherein the device further comprises: a physical layer chip;

the input end of the physical layer chip is connected with the output end of the isolation transformer, and the output end of the physical layer chip is connected with the main controller.

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