IEPE data collector powered by POE

Abstract

The invention discloses a POE-powered IEPE data collector, which comprises a network port module connected with a POE switch, the network port module is connected with a POE power supply module and a PHY module, the PHY module is sequentially connected with an MCU module, an ADC module and a BNC interface filtering module connected with an IEPE sensor, the BNC interface filtering module is connected with a constant-current power supply module, and the constant-current power supply module is connected with a power supply module. The constant current power supply module, the ADC module, the MCU module and the PHY module are all connected with the POE power supply module, and the MCU module is connected with an SDRAM module. According to the invention, a POE power supply mode is adopted to provide a power supply for the collector, the wiring difficulty is reduced for industrial application occasions, the size is small, the requirement on installation conditions is low, ADC data is received by adopting a queue and is sent through TCP connection, and the data safety and reliability are high.

Description

Technical Field

[0001] The invention belongs to the technical field of signal detection and sensors, and in particular relates to a POE-powered IEPE data collector. Background Art

[0002] Piezoelectric integrated circuit (IEPE) refers to an acceleration sensor with a built-in charge amplifier circuit or voltage amplifier circuit. It is mainly composed of a piezoelectric sheet and a signal amplifier circuit. When working, a current bias of 2 to 10 mA needs to be applied to the piezoelectric sheet. It is often used for vibration signal detection of equipment.

[0003] An IEPE data collector is a key device that can provide bias current to IEPE sensors and acquire, process and transmit IEPE sensor signals. Currently, existing IEPE collectors have the following defects: IEPE sensors are often used in industrial production environments with harsh environments. Existing IEPE collection equipment requires a power cord, a transmission line and several IEPE signal lines to work, but many industrial production environments are difficult to meet their wiring requirements; some existing IEPE collection devices adopt a one-to-many working mode, and some working environments require multi-point detection with a large distance span, which requires the IEPE sensor to be connected to the collection device through a long-distance signal line, and the long-distance signal line has a certain signal attenuation and increases the risk of electromagnetic interference; existing collection devices are often large in size and have no installation space in many application scenarios. Summary of the invention

[0004] The purpose of the present invention is to provide a POE-powered IEPE data collector, which solves the problems of difficult wiring of existing IEPE collectors, high requirements for installation conditions and low data security reliability of long-distance signal lines.

[0005] The technical scheme adopted by the present invention is: a POE-powered IEPE data collector comprises a network port module connected to a POE switch, the network port module is connected to a POE power supply module and a PHY module, the PHY module is sequentially connected to an MCU module, an ADC module, and a BNC interface filter module connected to an IEPE sensor, the BNC interface filter module is connected to a constant current power supply module, the constant current power supply module, the ADC module, the MCU module and the PHY module are all connected to the POE power supply module, and the MCU module is connected to an SDRAM module.

[0006] The present invention is also characterized in that:

[0007] The network port module includes an RJ45 network port RJ1 connected to a POE switch, a HR641680E network transformer L1, a DB270S rectifier bridge D1, D2, a voltage regulator diode U1, resistors R1, R2, R3, R4, R5, R6, R7, R8, and capacitors C1, C2, C3, C4, C5, C6, C7, C8;

[0008] The 1, 2, 3, and 6 pins of RJ1 are connected to the 16, 14, 11, and 9 pins of L1 respectively. The 4, 5, 7, and 8 pins of RJ1 are connected to the two ends of D1 respectively. The 10 and 15 pins of the primary center tap of L1 are connected to the two ends of D2. The 1, 3, 6, and 8 pins of L1 secondary are connected to the PHY module. The 7 and 2 pins of the secondary center tap of L1 are connected to one end of C1. The other end of C1 is connected to the digital ground. The 9, 10, 11, and 12 pins of RJ1 are connected to one end of R3, R4, R2, and R1 respectively. The other ends of R3, R4, R2 and R1 are connected to the digital ground to form a network port indicator light circuit. The input port of D1 is connected in series with C4, R5 and C5, R6 respectively. The input port of D2 is connected in series with C6, R7 and C7, R8 respectively. The other ends of R5, R6, R7 and R8 are connected through C8. The output ports of D1 and D2 with the same polarity are connected together. The output ports of D1 and D2 are connected in parallel with C2, C3 and U1. The output port composed of D1 and D2 is connected to the POE power supply module.

[0009] The POE power supply module includes TPS23753APWR chip U2, voltage regulator diode U3, DC-DC step-down chip U4, isolation optocoupler U5, 12~24V boost module U6, LDO voltage regulator chip U7, TL431 voltage regulator chip U8, inductor L2, L3, capacitor C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C 25, C26, C27, C28, C29, C30, C31, C32, C33, C34, resistors R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, diodes D3, D4, D5, D6, MOS tube Q1, network transformer T1;

[0010] The 48V DC output of D1 and D2 in the network port module first passes through R9 and U2. Pin 11 of U2 is connected to 48VSS through R16. The VDD network label is also connected to pins 8 and 9 of U2, and is connected to the VSS network label through C20 and U3. The VDD network label is connected to one end of C9 and L2, and the other end of L2 is connected to one end of C10 and C11 and pin 3 of T1. The other end of C9, C10 and C11 is connected to PGND, and pin 4 of T1 is connected to the anode of D3. The other end of D3 is connected to one end of R10 and C12, and the other end of R10 and C12 is connected to pin 3 of T1. The pins of Q1 and Q2 are connected, Q1 is connected to the 4th pin of T1, the driving pulse of Q1 comes from the 5th pin of U2, which are connected by R17, the 2nd, 3rd and 4th pins of Q1 are connected to one end of R18 and R19, the other end of R18 is connected to the 3rd pin of U2 chip, the other end of R19 is connected to PGND, the 1st pin of T1 is connected to one end of R11, R11 is connected to the anode of D4, the cathode of D4 is connected to C15, C16, and the 4th pin of U2, the other end of C15 and C16 is connected to PGND, the 2nd pin of T1 is connected to PGND, PGND is connected to the digital ground through C17, the 14th and 15th pins of U2 are connected to the digital ground through C17, and the 16th and 17th pins of U2 are connected to the digital ground through C17. Pins 3 and 12 are connected to PGND through R13, R14, and R15 respectively. Pins 9 and 10 of T1 are connected to the cathode of D5, and the anode of D5 is connected to the digital ground. The series structure composed of R12 and C18 is connected in parallel at both ends of D5. Pins 7 and 8 of T1 are connected to C13 and C14, and the other ends of C13 and C14 are connected to the digital ground. The secondary winding of T1 obtains 12V DC after rectification and filtering, and then is fed back to U8 after voltage division by R20, R28, and R31. The connection point of R28 and R31 is connected in series with C26 and R29 to pin 1 of U8. C25 is connected in parallel at both ends of C26 and R29. R 27 is connected in parallel with the upper and lower ends of D8, and one end is connected to the connection point of R20 and R28, and the other end is connected to pin 1 of U8. The middle pin of D8 is connected to the connection point of R26 and C30, and the other end of C30 is connected to the digital ground. The other end of R26 is connected to D8 and R25, and the other end of R25 is connected to pin 1 of U5. Pin 2 of U5 is connected to pin 1 of U8, and pin 3 of U5 is connected to PGND. Pin 4 of U5 is connected to pin 2 of U2 through R23. The series structure composed of C23 and R24 is connected in parallel at both ends of R23. One end of C19 is connected to PGND, and the other end is connected to pin 2 of U2.

[0011] The 12V DC output is boosted to 24V through the boost circuit composed of U6, C31, C33, C32, and C34 to supply the constant current power supply module, where the 12V DC is connected in parallel with GND at both ends of C31 and C33, as well as pins 1 and 2 of U6, and C32 and C34 are connected in parallel to pins 4 and 6 of U6. The other way is reduced to 5V through the step-down circuit composed of C22, C21, C24, R21, R22, L3, D6, and D7 to supply the ADC module, where C22 is connected in parallel to pins 7 and 6 of U4, C21 is connected in parallel to pins 1 and 8, D7 is connected in parallel to pins 8 and 9, R22 is connected in parallel to pins 4 and 9, and pin 8 of U4 is connected in parallel to pin 1 and 2. The pin passes through the filtering circuit composed of L3 and C24 in series to get a 5V output. The other end of C24 is connected to the digital ground. D6 is connected in parallel at both ends of C24. The 5V voltage passes through the voltage stabilizing circuit composed of U7, C27, C28, and C29 to stabilize the voltage at 3.3V and supply it to the MCU module, SDRAM module and PHY module. Among them, the 5V voltage input value is pin 3 of U7, C27 and C28 are connected in parallel to pins 1 and 3 of U7, pin 1 is connected to the digital ground, pin 4 outputs 3.3V and is connected to one end of C29 and R30, the other end of C29 is connected to the digital ground, one end of R30 is connected to 3.3V and the other end is connected to LED1, and the other end of LED1 is connected to the digital ground.

[0012] The ADC module includes an AD7606 chip U9, capacitors C35, C36, C37, C38, C39, C40, C41, resistors R32, R33, and magnetic beads L4, L5;

[0013] The 5V power supply is first connected to one end of C35 and L4, the other end of C35 is connected to AGND, the other end of L4 is connected to C36 and pin 1 of U9, the other end of C36 is connected to AGND, C35, C36 and L4 form the power supply filter circuit of U9, the 44 and 45 pins of U9 are short-circuited, the 45, 42, 39, 36 pins of U9 are connected to one end of C37, C38, C39, C40 respectively, the other end of C37, C38, C39, C40 Both are connected to AGND, pins 24 and 27 of U9 are connected in parallel at both ends of C41, both ends of C41 are connected to 3.3V and AGND respectively, pin 6 of U9 is connected to one end of R32 and R33, the other end of R32 is connected to 3.3V, the other end of R33 is connected to AGND, GND and AGND are connected through L5, the parallel interface of U9 is connected to the parallel interface of the MCU module for communication, and the V1 and V2 pins of U9 are connected to the BNC interface filter module.

[0014] The constant current power supply module includes an XTR111 current source chip U10, a P-channel MOS tube U11, a transistor Q2, a bidirectional voltage regulator D9, resistors R34, R35, R36, R37, R38, capacitors C42, C43, C44, and magnetic beads L6, L7;

[0015] The DAC peripheral of the MCU module generates a 2V voltage signal which is transmitted from the PA4 pin to one end of L7, filtered by C44 and connected in series with R36, and finally connected to the 6th pin of U10. The 7th pin of U10 is connected to AGND through R37, and the 8th pin of U10 is connected to 3.3V through R35. The 9th and 10th pins of U10 are directly connected to AGND, and the 4th and 5th pins of U10 are short-circuited. The 24V DC power supply passes through L6 and then is filtered by C42 and connected to U10. Pin 1 of U10 is connected to the emitter of Q2, pin 3 of U10 is connected to the collector, the emitter of Q2 is connected in series with R34, the other end of R34 is connected to the base of Q2 and the drain of U11, the collector of Q2 is connected to the gate of U11, the source of U11 is connected to one end of D9, C43, and R38, the other end of D9 and C43 is connected to AGND, and the other end of R38 is connected to the central axis of the BNC interface of the BNC interface filter module.

[0016] The BNC interface filter module includes a BNC connector B1, capacitors C45 and C46, ​​and resistors R39 and R40;

[0017] B1 is used to connect the IEPE sensor. R38 of the constant current power supply module is connected to the center pin of B1 to input the constant current to the IEPE sensor. C45 is connected in series with B1 to filter out the DC component in the IEPE sensor signal. Then, the RC filter circuit composed of R39 and C46 in series is used to filter out the high-frequency noise and connect to the acquisition port V1 of U9. R40 is connected in parallel at both ends of C46 to pull down the acquisition port V1 of U9.

[0018] The MCU module is connected to the PHY module of model LAN8720A and the SDRAM module of model W9864G6KH-6I. When a host computer establishes a connection with the MCU module through the TCP protocol, the MCU starts the timer output PWM to drive the U9 of the ADC module to start collecting and outputting. After converting the data, U9 sends a pulse signal to cause the MCU to enter an interrupt. The MCU reads the U9 data through the parallel interface and stores it in the cache queue. The main task of the MCU reads the queue data when the cache queue is not zero, and then stores it in the network data packet. When the network data packet exceeds 1400 bytes, the data packet is sent to the host computer.

[0019] The beneficial effects of the present invention are as follows: the POE-powered IEPE data collector of the present invention adopts POE power supply to provide power for the collector, which reduces the wiring difficulty for industrial applications, has a small size, and has low requirements for installation conditions. It adopts a queue to receive ADC data and sends data through a TCP connection, and has high data security and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural schematic diagram of a POE-powered IEPE data collector of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the network port module in the POE-powered IEPE data collector of the present invention;

[0022] Figure 3 It is a structural schematic diagram of a POE power supply module in a POE-powered IEPE data collector of the present invention;

[0023] Figure 4 It is a structural schematic diagram of an ADC module in a POE-powered IEPE data collector of the present invention;

[0024] Figure 5 It is a structural schematic diagram of a constant current power supply module in a POE-powered IEPE data collector of the present invention;

[0025] Figure 6 It is a structural schematic diagram of a BNC interface filter module in a POE-powered IEPE data collector of the present invention;

[0026] Figure 7 It is a working flow diagram of the MCU module of the POE-powered IEPE data collector of the present invention;

[0027] Figure 8 It is a component layout diagram of the POE-powered IEPE data collector of the present invention. DETAILED DESCRIPTION

[0028] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] The present invention provides a POE-powered IEPE data collector, comprising a network port module, a POE power supply module, a PHY module, an MCU module, an SDRAM module, an ADC module, a constant current power supply module, and a BNC interface filter module. The network port module is connected to a POE switch via a network cable, and separates a power supply path from a data transmission path; the POE power supply module supplies power to all other modules, and simplifies the transmission line and the power supply line into one line; the PHY module sends and receives Ethernet signals; the MCU module acquires, processes, and transmits data; the SDRAM module provides a sufficiently large cache for data transmission; the ADC module is driven by the MCU module to collect data; the constant current power supply module provides a bias current for the IEPE sensor; and the BNC interface filter module filters the IEPE sensor signal.

[0031] Example 2

[0032] The present invention provides a POE powered IEPE data collector, comprising:

[0033] The network port module is connected to the POE switch via a network cable and separates the power supply path and the data transmission path;

[0034] The POE power supply module receives 48V DC power from the POE switch, reduces the voltage to 12V through the isolation transformer, reduces it to 5V through the step-down circuit to power the ADC, and then reduces the voltage to 3.3V through the LDO to power the MCU, SDRAM, and PHY. The other way is boosted to 24V through the boost circuit to power the constant current power supply module.

[0035] PHY module, connected with MCU module, edits sending and receiving signals;

[0036] The MCU module is connected to the ADC module to control the conversion of ADC data, and is connected to the PHY module to receive and send network data packets. The DAC peripheral is connected to the constant current source module to control the constant current source to output a specified current.

[0037] SRAM module, providing enough space for data cache;

[0038] The ADC module collects the filtered IEPE sensor AC signal and sends a conversion completion signal to the MCU;

[0039] Constant current power supply module, which provides the bias current required for the IEPE sensor to work;

[0040] BNC interface filter module, BNC interface is connected to IEPE sensor, and the filter circuit removes DC signal and high-frequency noise.

[0041] When working, the BNC interface filter module is connected to the IEPE sensor, the constant current power supply module provides current bias for the IEPE sensor, and the IEPE sensor signal is connected to the ADC acquisition port after passing through the BNC interface filter circuit. After receiving the acquisition instruction, the MCU module drives the ADC to start data acquisition. After the acquisition is completed, the ADC sends a pulse to notify the MCU to obtain the data. The MCU processes and packages the data. When the data packet reaches 1400 bytes, the MCU sends the data packet to the PHY module. The PHY module converts the data packet into a level signal and sends it to the POE switch through the network port module. The SDRAM module provides sufficient memory space for the MCU to obtain, process, and send data algorithms.

[0042] Example 3

[0043] like Figure 1 As shown, the present invention provides a POE-powered IEPE data collector, including a network port module, a POE power supply module, a PHY module, an MCU module, an SDRAM module, an ADC module, a constant current power supply module, and a BNC interface filter module.

[0044] After the POE switch is connected to the network port module through a network cable, the POE power supply module interacts with the POE switch according to the IEEE802.3af protocol, and then the POE switch provides 48V direct current, and the POE power supply module reduces the voltage to 12V, and the back stage is boosted to 24V to power the constant current power supply module, and the other is reduced to 5V to power the ADC module, and then reduced to 3.3V to power the MCU module, SDRAM module, and PHY module. When the MCU module is powered on, the DAC peripherals will be initialized, and a 2V voltage signal will be sent to the constant current source module. The constant current power supply module generates a 4mA constant current and outputs it to the IEPE sensor through the BNC interface. When the host computer software accesses the IP and port of the present invention, the present invention will establish TCP communication with the host computer software, and then send a PWM wave with a frequency of the sampling frequency to the ADC module, turn on the ADC to collect data, and send a pulse signal to the MCU after the ADC collection is completed, causing the MCU to interrupt the reading of the ADC collection data and store it in the queue. The MCU network task reads the queue and stores it in the data packet when the queue input is not empty, and sends the data packet to the PHY module after the specified size is met.

[0045] like Figure 2As shown, the network port module includes an RJ45 network port RJ1 connected to a POE switch, a HR641680E network transformer L1, DB270S rectifier bridges D1 and D2, a voltage-stabilizing diode U1, resistors R1-R8, and capacitors C1-C8. Pins 1, 2, 3, and 6 of the network port RJ1 are respectively connected to pins 16, 14, 11, and 9 of the network transformer. A differential signal line with an impedance of 100 ohms is used for connection during PCB wiring. Pins 4, 5 and 7, 8 of the network port RJ1 are connected to both ends of the rectifier bridge D1. The primary center taps 10 and 15 of the network transformer are connected to both ends of the rectifier bridge D2. The secondary pins 1, 3, 6, and 8 of the network transformer are connected to the PHY module through a differential line with an impedance of 100 ohms. The secondary center taps 7 and 2 of the network transformer are connected to one end of the capacitor C1, and the other end of C1 is grounded. Pins 9, 10, 11, and 12 of the network port are connected to the resistor R3. , R4, R2, and one end of R1 are connected, and the other end of the resistor is connected to the digital ground to form a network port indicator light circuit. The input ports of the rectifier bridges D1 and D2 are connected in series with C4, R5, C5, R6, C6, R7, C7, and R8 respectively. The other end of the resistor is connected through a safety ceramic capacitor C8. The output ports of the rectifier bridges D1 and D2 with the same polarity are connected together to be compatible with POE switches with different power supply lines. The output ports of the two rectifier bridges are connected in parallel with capacitors C2, C3 and Zener diode U1. The output ports of the two rectifier bridges are connected to the POE power supply module. The network port housing and the device housing are connected to AGND for shielding.

[0046] like Figure 3As shown, the POE power supply module includes TPS23753APWR chip U2, voltage regulator diode U3, DC-DC step-down chip U4, isolation optocoupler U5, 12-24V boost module U6, LDO voltage regulator chip U7, TL431 voltage regulator chip U8, inductor L2, L3, capacitor C9-C34, resistor R9-R31, diode D3-D6, MOS tube Q1, and network transformer T1. The 48V DC output by D1 and D2 in the network port module first passes through the 24.9K ohm resistor R9 and the chip U2. The 11th pin of U2 is connected to 48VSS through R16, so that the POE switch thinks that the circuit impedance is about 25K ohms when connected. The VDD network label is also connected to the 8th and 9th pins of the chip U2, and is connected to the VSS network label through the capacitor C20 and the voltage-stabilizing diode U3. The VDD network label is connected to one end of C9 and L2, and the other end of L2 is connected to one end of C10 and C11 and the 3rd pin of T1. The other end of C9, C10, and C11 is connected to PGND to form a filter. Circuit, pin 4 of T1 is connected to the anode of D3, the other end of D3 is connected to one end of R10 and C12, the other end of R10 and C12 is connected to pin 3 of T1, forming a freewheeling circuit to protect Q1, MOS tube Q1 is connected to pin 4 of transformer T1, the driving pulse of MOS tube Q1 comes from pin 5 of chip U2, and the middle is connected with resistor R17 to avoid excessive initial pulse current, pins 2, 3, and 4 of Q1 are connected to one end of R18 and R19, the other end of R18 is connected to pin 3 of U2 chip, the other end of R19 is connected to PGND, pin 1 of T1 is connected to one end of R11, R11 is connected to the anode of D4, the cathode of D4 is connected to C15, C16, and pin 4 of U2, the other end of C15 and C16 is connected to PGND, pin 2 of T1 is connected to PGND, and PGND is connected to the digital ground through C17. The circuit composed of R11, D4, C15, and C16 provides bias voltage for chip U2, and pins 14, 13, and 12 of chip U2 are connected to the analog ground through resistors R13, R14, and R15. Pins 9 and 10 of T1 are connected to the cathode of D5, and the anode of D5 is connected to the digital ground. The series structure composed of R12 and C18 is connected in parallel at both ends of D5. Pins 7 and 8 are connected to C13 and C14, and the other ends of C13 and C14 are connected to the digital ground. The secondary winding of T1 obtains 12V DC after rectification and filtering. The secondary winding of transformer T1 obtains 12V DC after rectification and filtering through D5, C18, R12, C13, and C14, and then is fed back to TL431 after voltage division by R20, R28, and R31. The connection point of R28 and R31 is connected in series with C26 and R29 to pin 1 of U8. C25 is connected in parallel to both ends of C26 and R29. R27 is connected in parallel to the upper and lower ends of D8, and one end is connected to the connection point of R20 and R28, and the other end is connected to pin 1 of U8.The middle pin of D8 is connected to the connection point of R26 and C30, the other end of C30 is connected to the digital ground, the other end of R26 is connected to D8 and R25, the other end of R25 is connected to pin 1 of U5, pin 2 of U5 is connected to pin 1 of U8, pin 3 of U5 is connected to PGND, pin 4 of U5 is connected to pin 2 of U2 through R23, the series structure composed of C23 and R24 is connected in parallel at both ends of R23, one end of C19 is connected to PGND, and the other end is connected to pin 2 of U2, and TL431 feeds back to chip U2 through the isolation optocoupler U5, and chip U2 adjusts the duty cycle and thus the output voltage. The 12V output is boosted to 24V through the boost circuit composed of chip U6, C31, C33, C32, and C34 to supply the constant current power supply module, where 12V DC is connected in parallel with GND at both ends of C31 and C33, as well as pins 1 and 2 of U6, and C32 and C34 are connected in parallel to pins 4 and 6 of U6 to form the output. The other way is through the step-down circuit composed of C22, C21, C24, R21, R22, L3, D6, and D7 to reduce the voltage to 5V to supply the ADC module, where C22 is connected in parallel to pins 7 and 6 of U4, C21 is connected in parallel to pins 1 and 8, D7 is connected in parallel to pins 8 and 9, R22 is connected in parallel to pins 4 and 9, and pin 8 of U4 is connected in parallel to pin 1 and 2 of U4. Through the filter circuit composed of L3 and C24 in series, a 5V output is obtained, the other end of C24 is connected to the digital ground, D6 is connected in parallel to both ends of C24, and the 5V voltage is stabilized at about 3.3V through the voltage stabilization circuit composed of U7, C27, C28, and C29 to supply the MCU module, SDRAM module, and PHY module. The 5V voltage input value is the 3rd pin of U7, C27 and C28 are connected in parallel to the 1st and 3rd pins of U7, the 1st pin is connected to the digital ground, the 4th pin outputs 3.3V and is connected to one end of C29 and R30, the other end of C29 is connected to the digital ground, one end of R30 is connected to 3.3V, and the other end is connected to LED1, and the other end of LED1 is grounded to indicate whether the power supply is normal.

[0047] like Figure 4As shown, the ADC module includes an AD7606 chip U9, capacitors C35-C41, resistors R32 and R33, and magnetic beads L4 and L5. The 5V power supply is first connected to one end of the capacitor C35 and the magnetic bead L4, the other end of the capacitor C35 is connected to AGND, the other end of the magnetic bead is connected to the capacitor C36 and the No. 1 pin of the chip U9, the other end of the capacitor C36 is connected to AGND, the capacitors C35, C36 and the magnetic bead L4 constitute the power supply filter circuit of the AD7606, the 44 and 45 pins of the chip U9 are short-circuited, the 45, 42, 39, 36 pins of the chip U9 are respectively connected to one end of the capacitors C37, C38, C39, C40, The other end of the capacitor is connected to AGND, pins 24 and 27 of chip U9 are connected in parallel at both ends of capacitor C41, and both ends of capacitor C41 are connected to 3.3V and AGND respectively, indicating the level voltage of data communication, pin 6 of chip U9 is connected to one end of resistors R32 and R33, the other end of R32 is connected to 3.3V, and the other end of R33 is connected to AGND. Only one of R33 and R32 needs to be welded when welding, so as to select the acquisition voltage range of ADC, GND and AGND are connected through magnetic bead L5, the parallel interface of U9 is connected to the parallel interface of MCU module for communication, and the V1 and V2 pins of U9 are connected to the BNC interface filter module.

[0048] like Figure 5 As shown, the constant current power supply module includes XTR111 current source chip U10, P-channel MOS tube U11, transistor Q2, bidirectional voltage regulator D9, resistors R34-R38, capacitors C42-C44, and magnetic beads L6 and L7. The DAC peripheral of the MCU generates a 2V voltage signal which is transmitted from the PA4 pin to one end of the magnetic bead L7, filtered by capacitor C44 and connected in series with resistor R36, and finally connected to pin 6 of chip U10. Pin 7 of chip U10 is connected to AGND via resistor R37, pin 8 of U10 is connected to 3.3V via R35, pins 9 and 10 are directly connected to AGND, pins 4 and 5 are short-circuited, and the 24V DC power supply is connected to pin 1 of chip U10 after passing through magnetic bead L6 and then filtered by capacitor C42, and pin 2 of chip U10 is connected to The emitter of transistor Q2 is connected, pin 3 is connected to the collector, the emitter of transistor Q2 is connected in series with R34, the other end of R34 is connected to the base of transistor Q2 and the drain of MOS tube U11, the collector of transistor Q2 is connected to the gate of MOS tube U11, the source of MOS tube U11 is connected to the bidirectional voltage regulator D9, capacitor C43, and one end of resistor R38, the other end of bidirectional voltage regulator D9 and capacitor C43 are connected to AGND, the other end of R38 is connected to the central axis of the BNC interface, and the output current calculation formula of the constant current power supply module is: In the present invention, V DAC is 2V, R 37 is 5K ohms, so the output current is 4mA.

[0049] like Figure 6 As shown, the BNC interface filter module includes a BNC connector B1, R38 of the constant current power module is connected to the center pin of B1, and the constant current is input to the IEPE sensor, capacitors C45 and C46, ​​and resistors R39 and R40. The BNC interface B1 is used to connect the IEPE sensor, and the capacitor C45 is connected in series with the BNC interface to filter out the DC component in the IEPE sensor signal, and then the RC filter circuit composed of R39 and C46 in series filters out the high-frequency noise, and is connected to the acquisition port V1 of AD7606, and the resistor R40 is connected in parallel at both ends of C46 to pull down the acquisition port V1 of AD7606.

[0050] The MCU module is connected to the PHY module of model LAN8720A and the SDRAM module of model W9864G6KH-6I. The connection line width is 6.1mil and the connection is of equal length. When a host computer establishes a connection with the MCU module through the TCP protocol, the MCU starts the timer output PWM to drive the U9 of the ADC module to start collecting output. After U9 converts the data, it sends a pulse signal to cause the MCU to enter an interrupt. The MCU reads the U9 data through the parallel interface and stores it in the cache queue. The main task of the MCU reads the queue data when the cache queue is not zero, and then stores it in the network data packet. When the network data packet exceeds 1400 bytes, it sends the data packet to the host computer. Figure 7 As shown in the figure, it is the internal program flow chart of the MCU module. After the MCU is powered on, the clock, GPIO, SDRAM, AD7606, and Ethernet are initialized first. After the initialization is completed, the program will enter the main task and check whether there is a TCP connection. If the TCP connection message is not obtained, the main task will be blocked and the CPU will fall into the idle task. When there is a TCP connection access, the main task will be awakened, thereby turning on the PWM signal to enable the AD7606 to start collecting data. After the AD7606 completes the data collection, it will send a pulse to cause the MCU to enter an interrupt, read the data and store it in the queue, and then return to the main task. When the number of readable data in the queue is greater than zero, the program will read the queue data and put it in the data packet, and then determine whether the data packet is full. When the data packet is full, the TCP sending function of the TCP / IP protocol stack is called to send the data packet to the host computer, and then continue to determine whether there is data in the queue. If the TCP sending fails, it means that the connection is interrupted or the host computer is disconnected, then the PWM signal output is turned off and the connection is deleted, and the main task is blocked in the connection monitoring again.

[0051] The PCB layout of the present invention is as follows Figure 8As shown in the figure, the network port module is placed in the center of the left side of the PCB, the POE main power supply is placed above the PCB, the PHY module is located in the center of the PCB, the MCU module, SDRAM, and AD7606 modules are arranged from left to right in the middle and lower part of the PCB, the filter circuit of the BNC interface is close to the acquisition pin of the AD7606, and the constant current power module circuit is placed on the back of the PCB. The PCB contains three different ground plane divisions. The ground planes around the PCB are AGND, the ground planes in the middle and upper part are PGND, and the ground planes in the middle and lower part are DGND. All components except the interface are limited to a PCB board of 84mm high and 100mm wide. The PCB board adopts a 4-layer board design, and the components are distributed on both sides of the PCB board.

Claims

1. POE powered IEPE data collector, characterized by: It includes a network port module connected to a POE switch, the network port module is connected to a POE power supply module and a PHY module, the PHY module is sequentially connected to an MCU module, an ADC module, and a BNC interface filter module connected to an IEPE sensor, the BNC interface filter module is connected to a constant current power supply module, the constant current power supply module, the ADC module, the MCU module and the PHY module are all connected to the POE power supply module, and the MCU module is connected to an SDRAM module.

2. The POE-powered IEPE data collector according to claim 1, characterized in that: The network port module includes an RJ45 network port RJ1 connected to a POE switch, a HR641680E network transformer L1, a DB270S rectifier bridge D1, D2, a voltage regulator diode U1, resistors R1, R2, R3, R4, R5, R6, R7, R8, and capacitors C1, C2, C3, C4, C5, C6, C7, C8; The 1, 2, 3, and 6 pins of RJ1 are connected to the 16, 14, 11, and 9 pins of L1 respectively. The 4, 5, 7, and 8 pins of RJ1 are connected to the two ends of D1 respectively. The 10 and 15 pins of the primary center tap of L1 are connected to the two ends of D2. The 1, 3, 6, and 8 pins of L1 secondary are connected to the PHY module. The 7 and 2 pins of the secondary center tap of L1 are connected to one end of C1. The other end of C1 is connected to the digital ground. The 9, 10, 11, and 12 pins of RJ1 are connected to one end of R3, R4, R2, and R1 respectively. The other ends of R3, R4, R2 and R1 are connected to the digital ground to form a network port indicator light circuit. The input port of D1 is connected in series with C4, R5 and C5, R6 respectively. The input port of D2 is connected in series with C6, R7 and C7, R8 respectively. The other ends of R5, R6, R7 and R8 are connected through C8. The output ports of D1 and D2 with the same polarity are connected together. The output ports of D1 and D2 are connected in parallel with C2, C3 and U1. The output port composed of D1 and D2 is connected to the POE power supply module.

3. The POE-powered IEPE data collector according to claim 2, characterized in that: The POE power supply module includes a TPS23753APWR chip U2, a voltage regulator diode U3, a DC-DC buck chip U4, an isolation optocoupler U5, a 12-24V boost module U6, an LDO voltage regulator chip U7, a TL431 voltage regulator chip U8, inductors L2 and L3, capacitors C9, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C20, C21, C22, C23, C24, C25, C26, C27, C28, C29, C30, C31, C32, C33, C34, resistors R9, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24, R25, R26, R27, R28, R29, R30, R31, diodes D3, D4, D5, D6, MOS tube Q1, network transformer T1; The 48V DC output of D1 and D2 in the network port module first passes through R9 and U2. Pin 11 of U2 is connected to 48VSS through R16. The VDD network label is also connected to pins 8 and 9 of U2, and is connected to the VSS network label through C20 and U3. The VDD network label is connected to one end of C9 and L2, and the other end of L2 is connected to one end of C10 and C11 and pin 3 of T1. The other end of C9, C10 and C11 is connected to PGND, and pin 4 of T1 is connected to the anode of D3. The other end of D3 is connected to one end of R10 and C12, and the other end of R10 and C12 is connected to pin 3 of T1. The pins of Q1 and Q2 are connected, Q1 is connected to the 4th pin of T1, the driving pulse of Q1 comes from the 5th pin of U2, which are connected by R17, the 2nd, 3rd and 4th pins of Q1 are connected to one end of R18 and R19, the other end of R18 is connected to the 3rd pin of U2 chip, the other end of R19 is connected to PGND, the 1st pin of T1 is connected to one end of R11, R11 is connected to the anode of D4, the cathode of D4 is connected to C15, C16, and the 4th pin of U2, the other end of C15 and C16 is connected to PGND, the 2nd pin of T1 is connected to PGND, PGND is connected to the digital ground through C17, the 14th and 15th pins of U2 are connected to the digital ground through C17, and the 16th and 17th pins of U2 are connected to the digital ground through C17. Pins 3 and 12 are connected to PGND through R13, R14, and R15 respectively. Pins 9 and 10 of T1 are connected to the cathode of D5, and the anode of D5 is connected to the digital ground. The series structure composed of R12 and C18 is connected in parallel at both ends of D5. Pins 7 and 8 of T1 are connected to C13 and C14, and the other ends of C13 and C14 are connected to the digital ground. The secondary winding of T1 obtains 12V DC after rectification and filtering, and then is fed back to U8 after voltage division by R20, R28, and R31. The connection point of R28 and R31 is connected in series with C26 and R29 to pin 1 of U8. C25 is connected in parallel at both ends of C26 and R29. R 27 is connected in parallel with the upper and lower ends of D8, and one end is connected to the connection point of R20 and R28, and the other end is connected to pin 1 of U8. The middle pin of D8 is connected to the connection point of R26 and C30, and the other end of C30 is connected to the digital ground. The other end of R26 is connected to D8 and R25, and the other end of R25 is connected to pin 1 of U5. Pin 2 of U5 is connected to pin 1 of U8, and pin 3 of U5 is connected to PGND. Pin 4 of U5 is connected to pin 2 of U2 through R23. The series structure composed of C23 and R24 is connected in parallel at both ends of R23. One end of C19 is connected to PGND, and the other end is connected to pin 2 of U2. The 12V DC output is boosted to 24V through the boost circuit composed of U6, C31, C33, C32, and C34 to supply the constant current power supply module, where the 12V DC is connected in parallel with GND at both ends of C31 and C33, as well as pins 1 and 2 of U6, and C32 and C34 are connected in parallel to pins 4 and 6 of U6. The other way is reduced to 5V through the step-down circuit composed of C22, C21, C24, R21, R22, L3, D6, and D7 to supply the ADC module, where C22 is connected in parallel to pins 7 and 6 of U4, C21 is connected in parallel to pins 1 and 8, D7 is connected in parallel to pins 8 and 9, R22 is connected in parallel to pins 4 and 9, and pin 8 of U4 is connected in parallel to pin 1 and 2. The pin passes through the filtering circuit composed of L3 and C24 in series to get a 5V output. The other end of C24 is connected to the digital ground. D6 is connected in parallel at both ends of C24. The 5V voltage passes through the voltage stabilizing circuit composed of U7, C27, C28, and C29 to stabilize the voltage at 3.3V and supply it to the MCU module, SDRAM module and PHY module. Among them, the 5V voltage input value is pin 3 of U7, C27 and C28 are connected in parallel to pins 1 and 3 of U7, pin 1 is connected to the digital ground, pin 4 outputs 3.3V and is connected to one end of C29 and R30, the other end of C29 is connected to the digital ground, one end of R30 is connected to 3.3V and the other end is connected to LED1, and the other end of LED1 is connected to the digital ground.

4. The POE-powered IEPE data collector according to claim 3, characterized in that: The ADC module includes an AD7606 chip U9, capacitors C35, C36, C37, C38, C39, C40, C41, resistors R32, R33, and magnetic beads L4, L5; The 5V power supply is first connected to one end of C35 and L4, the other end of C35 is connected to AGND, the other end of L4 is connected to C36 and pin 1 of U9, the other end of C36 is connected to AGND, C35, C36 and L4 form the power supply filter circuit of U9, the 44 and 45 pins of U9 are short-circuited, the 45, 42, 39, 36 pins of U9 are connected to one end of C37, C38, C39, C40 respectively, the other end of C37, C38, C39, C40 Both are connected to AGND, pins 24 and 27 of U9 are connected in parallel at both ends of C41, both ends of C41 are connected to 3.3V and AGND respectively, pin 6 of U9 is connected to one end of R32 and R33, the other end of R32 is connected to 3.3V, the other end of R33 is connected to AGND, GND and AGND are connected through L5, the parallel interface of U9 is connected to the parallel interface of the MCU module for communication, and the V1 and V2 pins of U9 are connected to the BNC interface filter module.

5. The POE-powered IEPE data collector according to claim 4, characterized in that: The constant current power supply module includes an XTR111 current source chip U10, a P-channel MOS tube U11, a transistor Q2, a bidirectional voltage regulator D9, resistors R34, R35, R36, R37, R38, capacitors C42, C43, C44, and magnetic beads L6, L7; The DAC peripheral of the MCU module generates a 2V voltage signal which is transmitted from the PA4 pin to one end of L7, filtered by C44 and connected in series with R36, and finally connected to the 6th pin of U10. The 7th pin of U10 is connected to AGND through R37, and the 8th pin of U10 is connected to 3.3V through R35. The 9th and 10th pins of U10 are directly connected to AGND, and the 4th and 5th pins of U10 are short-circuited. The 24V DC power supply passes through L6 and then is filtered by C42 and connected to U10. Pin 1 of U10 is connected to the emitter of Q2, pin 3 of U10 is connected to the collector, the emitter of Q2 is connected in series with R34, the other end of R34 is connected to the base of Q2 and the drain of U11, the collector of Q2 is connected to the gate of U11, the source of U11 is connected to one end of D9, C43, and R38, the other end of D9 and C43 is connected to AGND, and the other end of R38 is connected to the central axis of the BNC interface of the BNC interface filter module.

6. The POE-powered IEPE data collector according to claim 5, characterized in that: The BNC interface filter module includes a BNC connector B1, capacitors C45 and C46, ​​and resistors R39 and R40; B1 is used to connect the IEPE sensor. R38 of the constant current power supply module is connected to the center pin of B1 to input the constant current to the IEPE sensor. C45 is connected in series with B1 to filter out the DC component in the IEPE sensor signal. Then, the RC filter circuit composed of R39 and C46 in series is used to filter out the high-frequency noise and connect to the acquisition port V1 of U9. R40 is connected in parallel at both ends of C46 to pull down the acquisition port V1 of U9.

7. The POE-powered IEPE data collector according to claim 6, characterized in that: The MCU module is connected to a PHY module of model LAN8720A and an SDRAM module of model W9864G6KH-6I. When a host computer establishes a connection with the MCU module through the TCP protocol, the MCU starts the timer output PWM to drive U9 of the ADC module to start collecting and outputting. After converting the data, U9 sends a pulse signal to cause the MCU to enter an interrupt. The MCU reads the U9 data through the parallel interface and stores it in the cache queue. The main task of the MCU reads the queue data when the cache queue is not zero, and then stores it in the network data packet. When the network data packet exceeds 1400 bytes, the data packet is sent to the host computer.

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