Universal high-precision clock synchronization board

Abstract

This utility model discloses a universal high-precision clock synchronization board, including a main control unit, a power management unit, a GNSS module unit, an OCXO crystal oscillator module, a second pulse output unit, an Ethernet communication unit, a CAN communication unit, an RTC module unit, a memory unit, and a human-machine interaction unit. It is widely applicable to monitoring systems in the field of ship power monitoring that require high-precision time synchronization. This precision clock synchronization board adopts a standard PCIe high-speed communication interface, making it compatible with various main control platforms and operating systems of industrial control computers and other embedded devices. By combining the PPS second pulse and the IEEE 1588 precision clock synchronization protocol, devices that do not inherently possess high-precision time synchronization capabilities can achieve microsecond-level precision clock synchronization accuracy by inserting this clock synchronization board for expansion and upgrade.

Description

Technical Field

[0001] This utility model relates to a general-purpose high-precision clock synchronization hardware board, belonging to the field of ship power monitoring. Background Technology

[0002] In traditional shipboard electrical monitoring systems, electrical equipment operates relatively independently, control loops are relatively simple, and the system has a certain margin of error to accommodate the temporal sequence of events, thus requiring relatively low time synchronization accuracy, typically at the second level. This level of synchronization accuracy is mainly used for basic recording of equipment operating status, time sequencing of fault events, and routine maintenance analysis. Therefore, most controller devices in current shipboard electrical monitoring systems only need to provide steady-state data refreshed at the second level to meet practical application requirements.

[0003] However, with the development of ship intelligence, power systems are becoming increasingly complex, and more and more critical electrical equipment needs to operate collaboratively, such as distributed power systems, intelligent multi-load scheduling, and energy efficiency optimization control. These applications require the system to have higher resolution in terms of event occurrence time, and multiple control nodes need to accurately sample and judge data at the same time to achieve coordinated control and real-time response. In addition, higher-order applications in ship power monitoring systems, such as power flow calculation, state estimation, static security analysis, and system reconfiguration, have raised the application requirements for higher synchronization accuracy.

[0004] Against this backdrop, the power monitoring systems of intelligent ships have placed microsecond-level or even sub-microsecond-level precision requirements on time synchronization. For example, in multi-power grid-connected control, precise matching of voltage and frequency depends on high-precision time synchronization; in rapid fault isolation and self-healing control, only by achieving sub-millisecond time consistency among all nodes can the accuracy and coordination of protection actions be ensured.

[0005] Patent application CN116644710A, entitled "Clock Synchronization Method and System for Semiconductor Test Machines," proposes a clock synchronization method and system for semiconductor test machines. This scheme generates a synchronized calibration pulse signal and a synchronized clock signal via an FPGA chip on a synchronization board inside the semiconductor test machine. These signals are connected to various resource boards via a backplane. Based on reference parameters and delay parameters fed back from each resource board, the clock phase on each output channel is configured using the FPGA's internal clock configuration interface to achieve clock synchronization. However, this patent only involves pulse and clock signals to achieve clock synchronization between internal boards and does not address the overall clock synchronization mechanism for external systems.

[0006] The utility model patent CN209867691U, entitled "Four-Axis PEG and Laser Clock Synchronization Board," discloses a four-axis PEG and laser clock synchronization board. This board connects to the CPU via a laser clock pulse interface and a laser clock pulse conversion and filtering circuit to achieve high-precision clock synchronization of the four-axis PEG. However, the synchronization scheme in this utility model only involves laser clock pulses to achieve clock synchronization of the internal four-axis PEG of the device; it does not involve an overall clock synchronization mechanism for external systems, and the board does not have the capability for integration and adaptation with other devices. Utility Model Content

[0007] The purpose of this invention is to propose a universal high-precision clock synchronization board that combines a standard PCIE high-speed communication interface with PPS second pulse and IEEE 1588 precision clock synchronization protocol, enabling devices that do not inherently possess high-precision time synchronization capabilities to be upgraded to meet microsecond-level precision clock synchronization accuracy.

[0008] To achieve the above objectives, the technical solution of this utility model discloses a general-purpose high-precision clock synchronization board, characterized in that it includes a main control unit;

[0009] The main control unit's PCIe port is connected to the PCIe interface;

[0010] The UTC time reference signal input terminal of the main control unit is connected to the signal output terminal of the GNSS module unit, and the SMA interface of the GNSS module unit is connected to the GPS / BeiDou signal;

[0011] The local frequency input terminal of the main control unit is connected to the output terminal of the OCXO crystal oscillator module;

[0012] The main control unit's data interaction port one is connected to the memory unit;

[0013] The local UTC time base input terminal of the main control unit is connected to the signal output terminal of the RTC module unit;

[0014] The CAN communication port of the main control unit is connected to an external CAN interface via a CAN communication unit;

[0015] The Ethernet communication port of the main control unit is connected to an external Ethernet interface via an Ethernet communication unit;

[0016] The data interaction port of the main control unit is connected to the human-computer interaction unit;

[0017] The SMA interface output of the main control unit is connected to an external SMA second pulse interface via a second pulse output unit;

[0018] The power input terminal of the power management unit is connected to the PCIe interface, and the power output terminal of the power management unit is connected to the power supply ports of the main control unit, GNSS module unit, OCXO crystal oscillator module, memory unit, RTC module unit, CAN communication unit, Ethernet communication unit, human-machine interaction unit, and second pulse output unit.

[0019] Preferably, the main control unit adopts the domestically produced Ziguang Tongchuang PG2L100H FPGA.

[0020] Preferably, the GNSS module unit adopts the domestically produced Hexin Xingtong UM220-IV type GNSS precision timing module.

[0021] Preferably, the OCXO crystal oscillator module uses a domestically produced TO559T58SL-10M temperature-controlled crystal oscillator.

[0022] Preferably, the Ethernet communication unit consists of two Ethernet communication modules, each of which uses the domestically produced YT8521 Ethernet chip from Yutai Microelectronics.

[0023] Preferably, the CAN communication unit consists of two CAN communication modules, each of which uses a domestically produced SIT1051QT high-speed communication module.

[0024] Preferably, the RTC module unit adopts the domestically produced DAPU ultra-high precision INS5902A RTC clock module.

[0025] Preferably, the memory unit uses a domestically produced CW24C64AC EEPROM memory chip from Chipsource Semiconductor.

[0026] Preferably, the human-machine interaction unit includes four LED indicator lights, a reset button, and a four-position DIP switch. The four LED indicator lights are a power indicator light, a GNSS satellite signal reception indicator light, a PTP timing indicator light, and a board operation status indicator light.

[0027] The universal high-precision clock synchronization hardware board proposed in this invention offers significant improvements in versatility and convenience compared to existing time synchronization boards. In shipboard power monitoring systems, inserting this clock synchronization board allows devices that lack inherent high-precision time synchronization capabilities to be upgraded to achieve microsecond-level precise clock synchronization accuracy. The specific advantages of this invention are as follows:

[0028] 1. Generality Optimization

[0029] The universal high-precision clock synchronization board provided by this invention connects to the host device using a standard PCIe high-speed communication interface, eliminating the need for hardware modifications to the host device. Furthermore, the board features both an Ethernet port and a CAN interface, meeting the general information exchange interface requirements for ships. In addition, the board supports multiple clock source inputs and multiple time synchronization outputs, fulfilling the universal requirements for precise clock synchronization.

[0030] 2. Convenience optimization

[0031] The universal high-precision clock synchronization board provided by this utility model adopts a standard PCIe interface to expand the functionality of host devices through a plug-and-play method. It has a disciplined phase-locked loop function jointly implemented by a GNSS module unit and an OCXO crystal oscillator module, and is equipped with a battery-backed real-time clock to ensure that the synchronization board can automatically maintain the high precision requirement of system clock synchronization in the event of satellite signal loss or power failure and restart.

[0032] 3. Improved system synchronization capabilities

[0033] This utility model provides a universal high-precision clock synchronization board that supports multiple clock source inputs, enabling the host device to have a high-precision time reference. It can also achieve clock synchronization for terminal devices within the system through a combination of PPS second pulses and the IEEE 1588 precise clock synchronization protocol, or independently using either PPS second pulse or the IEEE 1588 precise clock synchronization protocol. This improves the clock synchronization capability of traditional ship power systems from the second level to the microsecond or even sub-microsecond level. Attached Figure Description

[0034] Figure 1 A schematic diagram of the hardware structure of the high-precision clock synchronization board provided by this utility model. Detailed Implementation

[0035] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims.

[0036] Combination Figure 1 The universal high-precision clock synchronization board proposed in this utility model adopts a fully domestic solution and consists of 10 hardware units: main control unit 1, power management unit 2, GNSS module unit 3, OCXO crystal oscillator module 4, second pulse output unit 5, Ethernet communication unit 6, CAN communication unit 7, RTC module unit 8, memory unit 9, and human-machine interaction unit 10.

[0037] The main control unit 1 is the core control unit of the device's clock synchronization board. In this embodiment, a domestically produced Ziguang Tongchuang PG2L100H FPGA is used, responsible for selecting multiple clock sources such as PTP and IRIG-B (DC) for timing input, and outputting PPS second pulses and PTP synchronization messages for timing. The main control unit 1, in conjunction with the GNSS module unit 3 and the OCXO crystal oscillator module 4, implements intelligent disciplined phase-locked loop functions such as PLL control, frequency comparison, data processing, learning modeling, and predictive control, as well as Ethernet and CAN communication functions. The main control unit 1 also receives button and DIP switch operations from the human-machine interface unit 10 and indicates the operating status of the clock synchronization board via indicator lights.

[0038] The universal high-precision clock synchronization board disclosed in this utility model adopts PCIe power supply and does not require an external power supply. The power management unit 2 provides stable power supplies of 1.2V, 3.3V, and 5V to other functional units on the board.

[0039] In this embodiment, the GNSS module unit 3 adopts the domestic Hexin Xingtong UM220-IV GNSS precision timing module, which receives high-precision UTC time reference signals from GPS or Beidou satellites through the SMA interface and inputs them to the main control unit 1.

[0040] In this embodiment, the OCXO crystal oscillator module 4 uses a domestically produced TO559T58SL-10M temperature-controlled crystal oscillator, which features low phase noise and low drift, providing the main control unit 1 with a highly stable local frequency. This allows the main control unit 1 to compensate for the temperature characteristics and aging rate of the OCXO crystal oscillator module 4 through intelligent disciplined phase-locked loop (PLL) function after GNSS loss, continuing to provide highly reliable time and frequency reference information output.

[0041] The second pulse output unit 5 provides high-precision PPS second pulse output to the outside world through the SMA interface by the main control unit 1.

[0042] The Ethernet communication unit 6 consists of two Ethernet communication modules. In this embodiment, the Ethernet communication module adopts the domestic YT8521 Ethernet chip from Yutai Microelectronics. It transmits the power monitoring system business data and PTP high-precision synchronization messages to the external Ethernet interface through dual redundant and reliable Ethernet communication.

[0043] The CAN communication unit 7 consists of two CAN communication modules. In this embodiment, the CAN communication module adopts the domestic SIT1051QT high-speed communication module. Through dual-redundant and reliable CAN communication, the power monitoring system business data and simplified clock synchronization messages are transmitted to the external CAN interface.

[0044] In this embodiment, the RTC module unit 8 adopts the domestic DAPU ultra-high precision INS5902A RTC clock module, which has a built-in crystal + temperature compensation function module and a button battery to provide a UTC time reference when the synchronization board loses power and loses GNSS satellite signals.

[0045] In this embodiment, memory unit 9 uses a domestically produced CW24C64AC EEPROM memory chip from Chipsource Semiconductor to store the OCXO temperature / aging characteristic parameters learned by the main control unit 1 in the intelligent disciplined phase-locked loop function, and supports power-off retention. When the universal high-precision clock synchronization board provided by this utility model is powered off and restarted, it can restore the crystal oscillator characteristics previously learned through modeling.

[0046] The human-machine interface unit 10 includes indicator lights, buttons, and DIP switches. It includes four LED indicator lights: a power indicator, a GNSS satellite signal reception indicator, a PTP timing indicator, and a board operation status indicator; a reset button; and a four-position DIP switch, with the first two positions used to select the timing input clock source type and the last two positions used to select the timing output mode.

[0047] The high-precision clock synchronization board disclosed in this embodiment adopts a fully domestically produced solution and has a universal standard PCIe interface, which can be integrated and adapted to embedded devices such as industrial control computers and terminal controllers in a plug-and-play manner. Furthermore, the high-precision clock synchronization board disclosed in this embodiment has a PPS second pulse interface, an Ethernet communication interface conforming to the IEEE 1588 precise clock synchronization protocol, and a CAN communication interface widely used in ships. Finally, the high-precision clock synchronization board disclosed in this embodiment supports multiple clock source inputs such as 1PPS+TOD (BeiDou, GPS), PTP, and IRIG-B (DC), and the clock source can be automatically switched according to priority via DIP switches or web page configuration. Simultaneously, it supports multiple time synchronization outputs including 1PPS second pulse, 1PPS+TOD, PTP, and IRIG-B (DC).

Claims

1. A universal high-precision clock synchronization board card, characterized in that, Including the main control unit; The main control unit's PCIe port is connected to the PCIe interface; The UTC time reference signal input terminal of the main control unit is connected to the signal output terminal of the GNSS module unit, and the SMA interface of the GNSS module unit is connected to the GPS / BeiDou signal; The local frequency input terminal of the main control unit is connected to the output terminal of the OCXO crystal oscillator module; The main control unit's data interaction port one is connected to the memory unit; The local UTC time base input terminal of the main control unit is connected to the signal output terminal of the RTC module unit; The CAN communication port of the main control unit is connected to an external CAN interface via a CAN communication unit; The Ethernet communication port of the main control unit is connected to an external Ethernet interface via an Ethernet communication unit; The data interaction port of the main control unit is connected to the human-computer interaction unit; The SMA interface output of the main control unit is connected to an external SMA second pulse interface via a second pulse output unit; The power input terminal of the power management unit is connected to the PCIe interface, and the power output terminal of the power management unit is connected to the power supply ports of the main control unit, GNSS module unit, OCXO crystal oscillator module, memory unit, RTC module unit, CAN communication unit, Ethernet communication unit, human-machine interaction unit, and second pulse output unit.

2. A universal high-precision clock synchronization board card according to claim 1, characterized in that, The main control unit adopts the domestically produced Ziguang Tongchuang PG2L100H FPGA.

3. A universal high-precision clock synchronization board card according to claim 1, wherein, The GNSS module unit adopts the domestically produced Hexin Xingtong UM220-IV GNSS precision timing module.

4. The universal high-precision clock synchronization board card of claim 1, wherein, The OCXO crystal oscillator module uses a domestically produced TO559T58SL-10M isothermal crystal oscillator.

5. A general-purpose high-precision clock synchronization board as described in claim 1, characterized in that, The Ethernet communication unit consists of two Ethernet communication modules, each of which uses the domestically produced YT8521 Ethernet chip from Yutai Microelectronics.

6. A general-purpose high-precision clock synchronization board as described in claim 1, characterized in that, The CAN communication unit consists of two CAN communication modules, each of which uses a domestically produced SIT1051QT high-speed communication module.

7. A general-purpose high-precision clock synchronization board as described in claim 1, characterized in that, The RTC module unit adopts the domestically produced DAPU ultra-high precision INS5902A RTC clock module.

8. A general-purpose high-precision clock synchronization board as described in claim 1, characterized in that, The memory unit uses a domestically produced CW24C64AC EEPROM memory chip from Chipsource Semiconductor.

9. A general-purpose high-precision clock synchronization board as described in claim 1, characterized in that, The human-computer interaction unit includes four LED indicator lights, a reset button, and a four-position DIP switch. The four LED indicators are for power, GNSS satellite signal reception, PTP timing, and board operation status.

Images