Solenoid valve loop of energy equipment and on-line diagnosis device for safety state of solenoid valve loop

Abstract

The utility model discloses an energy equipment solenoid valve loop and a safety state on-line diagnosis device thereof, which belong to the technical field of energy equipment industrial control network safety, and comprise a control circuit, and a high voltage detection circuit, a phase detection circuit and a discharge detection circuit which are connected with the control circuit, the control circuit is used for logic control of the whole device, and the high-voltage detection circuit is used for detecting whether an electromagnetic valve control loop is electrified or not and transmitting a signal to the FPGA / MCU circuit for processing; the phase detection circuit is used for outputting PWM waves to the electromagnetic valve and detecting the phase difference of the PWM waves, and then coil inductive reactance of the electromagnetic valve is detected to judge whether a coil of the electromagnetic valve is intact or not. The discharge detection circuit is used for measuring the discharge time of the solenoid valve at the moment of power loss of the solenoid valve loop so as to judge the working state of a valve element of the solenoid valve. According to the utility model, the on-line diagnosis of the solenoid valve loop and the installation state thereof is realized, and the risk that the detection device interferes with the control system of the detected object is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of circuit safety state diagnostic device, specifically to a kind of energy equipment electromagnetic valve loop and its safety state online diagnostic device. BACKGROUND

[0002] With the promulgation and implementation of a series of laws and regulations such as "Network Security Law", "Data Security Law", "Personal Information Protection Law" and "Regulations on the Protection of Critical Information Infrastructure", network security has penetrated into various industries. Currently, the network security protection for industrial control systems is achieved by deploying firewalls, threat detection systems, host guardians, and other devices, using white list mechanisms and filtering information layer communication messages to reinforce industrial control networks. This approach has some positive effects on network security protection, but it cannot effectively prevent illegal operation commands from being issued through legitimate industrial control devices, thereby damaging the process flow and energy equipment, cannot prevent malicious manipulation of energy equipment, and cannot prevent safety incidents caused by the failure of the control loop of the energy equipment itself.

[0003] Electromagnetic valves are key control components of energy equipment (steam turbines, gas turbines, and wind turbines), mainly implementing electro-hydraulic signal conversion, operating condition switching, and emergency shutdown. There are two existing detection methods for electromagnetic valves and their control loops: one is to arrange maintenance personnel for regular inspection, and the other is to insert an electromagnetic valve monitoring module into the control loop. However, maintenance engineers can only disassemble and measure the electromagnetic valve and its control loop to troubleshoot faults before and after the energy equipment starts and stops. During normal production of the energy equipment, the only way to determine the quality of the electromagnetic valve is by its appearance, and it is impossible to truly grasp the internal fault information of the electromagnetic valve and its control loop, leading to the phenomenon of "refusal to act" by the electromagnetic valve in test conditions or emergency shutdown conditions.

[0004] In the prior art, such as patent number CN205808433U, entitled "Electromagnetic Valve Working State Detection Device", a method is provided for detecting the working state of a small-power electromagnetic valve by using the change in inductance when the electromagnetic valve is open or closed. This scheme has the following shortcomings: ① The detection device needs to be inserted into the electromagnetic valve loop, which increases the failure rate of the entire electromagnetic valve control loop due to the probability of failure of the detection device itself. ② The 220VAC is converted to 24VDC to provide driving power for the electromagnetic valve, which can only drive small-power electromagnetic valves and cannot drive high-power, high-voltage level energy equipment electromagnetic valves (35W / 220VDC).

[0005] For example, patent number CN103148280A, entitled "Electromagnetic valve fault online monitoring device", provides a kind of online detection BTS power device drive current, judge the working state of electromagnetic valve, this kind of scheme has the following shortcomings: ① same as patent number CN205808433U, requires the detection device to be inserted into electromagnetic valve loop, since the probability of failure of detection device itself, increase the failure rate of entire electromagnetic valve control loop;② by detecting the drive current of BTS power device, only the on-off state of electromagnetic valve coil can be detected, the real working state of the core driven by electromagnetic valve coil cannot be judged.

[0006] In addition, energy equipment (steam turbine, gas turbine, wind turbine) has many different function electromagnetic valves, such as high pressure blocking electromagnetic valve for emergency shutdown, test electromagnetic valve for daily valve activity test, quick closing electromagnetic valve for quickly closing control valve to prevent equipment overspeed, these electromagnetic valves must strictly work according to the logic truth table of each working condition of the unit, otherwise it will cause serious safety accidents and huge economic losses. Practical new type content

[0007] The utility model aims at solving the problem of lack of system comprehensive state monitoring of electromagnetic valve in the prior art, and proposes an energy equipment electromagnetic valve loop and a safety state online diagnosis device, to provide online detection and diagnosis capability for key control components and control loop of energy equipment.

[0008] In order to realize the above-mentioned utility model purposes, the technical scheme of the utility model is as follows:

[0009] An energy equipment electromagnetic valve loop and a safety state online diagnosis device, comprising an FPGA / MCU circuit and a high voltage detection circuit, a phase detection circuit and a discharge detection circuit electrically connected thereto;The FPGA / MCU circuit is used for logic control of the whole device, the high voltage detection circuit is used for detecting whether the electromagnetic valve control loop is electrified, and the signal is transmitted to the FPGA / MCU circuit for processing;The phase detection circuit is used for outputting PWM wave to electromagnetic valve and detecting its phase difference, and then detecting the inductance of electromagnetic valve coil, to judge whether the electromagnetic valve coil is intact;The discharge detection circuit is used for measuring the discharge time of electromagnetic valve at the moment of power loss of electromagnetic valve loop, to judge the valve core working state of electromagnetic valve.

[0010] Further, it further comprises an alarm output circuit connected with the FPGA / MCU circuit, and the alarm output circuit is used for outputting the alarm signal after voting of the FPGA / MCU circuit.

[0011] Further, it further comprises a storage circuit connected with the FPGA / MCU circuit, and the storage circuit is used for storing the electromagnetic valve electrification / power loss truth table of each operating condition of energy equipment and the configuration information of the whole device.

[0012] Further, a communication circuit connected to the FPGA / MCU circuit is further included, and the communication circuit is used to communicate with other devices to collect the operation condition information of the energy equipment.

[0013] Further, the high-voltage detection circuit includes the optocoupler U27, the thyristor IRF2 and the optocoupler U29; the first pin of the optocoupler U27 is connected to an input power supply through the resistor R63; the second pin is connected to the HVPWM control pin, used to adjust the pulse and control the switching state of the light-emitting diode in the optocoupler U27; the third pin of the optocoupler U27 is connected to the HVDCN through the resistor R67, and the fourth pin is connected to the D pin of the thyristor IRF2.

[0014] Further, the first pin of the optocoupler U29 is connected to the resistor R73, the second pin is connected to the HVDCN, and the optocoupler U29 is driven by the filter circuit composed of the inductor L2 and the capacitor C26 to control the switching state of the light-emitting diode; the fourth pin of the optocoupler U29 is connected to the HVSIG, used to transmit the signal into the FPGA / MCU circuit.

[0015] Further, the phase detection circuit includes the optocoupler U28 and the thyristor IRF1; the D pin of the thyristor IRF1 is connected to the diode D35, and the G pin is connected to the PHYPWM control pin, used to input the PWM excitation signal to the electromagnetic valve in the off state; the first pin of the optocoupler U28 is connected to the S pin of the thyristor IRF1, and the fourth pin is connected to the CAPSIG end, used to transmit the PMW signal of the electromagnetic valve loop into the FPGA / MCU circuit; the FPGA / MCU circuit calculates the inductance of the electromagnetic valve by the phase difference between the input PHYPWM excitation signal and the feedback CAPSIG signal.

[0016] Further, the discharge detection circuit includes the instrumentation amplifier, the first pin of the instrumentation amplifier is connected to the resistor R71, and the fourth pin is connected to the HVDCP through the resistor R70, used to receive the differential signal; the seventh pin of the instrumentation amplifier is connected to the AISIG end.

[0017] Further, when the electromagnetic valve is powered off, the electromagnetic valve, the freewheeling diode D33 and the cement resistor R66 form a discharge loop, pass through the π-type filter circuit composed of the inductor L1, the capacitor C23 and the capacitor C24, and then pass through the sampling resistor R69 and the instrumentation amplifier to transmit the discharge electric quantity into the FPGA / MCU circuit for A / D conversion, calculation of the discharge electric quantity and the spool working state of the electromagnetic valve.

[0018] Further, the detection probe of the device is connected in parallel in the electromagnetic valve circuit; when the working type of the electromagnetic valve is always powered, the detection probe is connected in parallel downstream of the fuse in the electromagnetic valve circuit; when the working type of the electromagnetic valve is always unpowered, the detection probe is connected in parallel upstream of the fuse in the electromagnetic valve circuit.

[0019] In conclusion, the utility model has the advantages of the following:

[0020] 1. The online diagnosis device can detect the voltage of the measured object under the powered working condition of the electromagnetic valve, actively measure the inductance of the measured object by inputting a low-voltage excitation signal to the measured object under the unpowered working condition of the electromagnetic valve, thereby realizing online diagnosis of the electromagnetic valve circuit and its installation state and reducing the risk of interference of the detection device on the control system of the measured object.

[0021] 2. The online diagnosis device connects the detection probe to the measured object in parallel, thereby reducing the risk of increasing the system fault points of the measured object.

[0022] 3. The online diagnosis device can combine the electromagnetic valve operation truth table, comprehensively monitor the running state of the electromagnetic valve, and realize real-time early warning of network attacks or malicious forced signals on the working state of the electromagnetic valve. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is an energy equipment electromagnetic valve circuit schematic diagram;

[0024] Figure 2 It is a detection point layout schematic diagram of the electromagnetic valve of the utility model for always unpowered;

[0025] Figure 3 It is a detection point layout schematic diagram of the electromagnetic valve of the utility model for always powered;

[0026] Figure 4 It is a circuit block diagram of the online diagnosis device of the utility model;

[0027] Figure 5 It is a high-voltage detection circuit diagram of the online diagnosis device of the utility model;

[0028] Figure 6 It is a phase detection circuit diagram of the online diagnosis device of the utility model;

[0029] Figure 7 It is a discharge detection circuit diagram of the online diagnosis device of the utility model;

[0030] Figure 8 It is a detection process of the electromagnetic valve and its control circuit of the utility model;

[0031] Figure 9 It is a detection process of the energy safety state of the utility model;

[0032] In the picture:

[0033] CT1, High Voltage Detection Circuit; CT2, Alarm Output Circuit; CT3, Phase Detection Circuit; CT4, Discharge Detection Circuit; CT5, Storage Circuit; CT6, FPGA / MCU Circuit; CT7, Communication Circuit; CT8, Power Supply Circuit. Detailed Implementation

[0034] To more clearly illustrate this utility model, the following description, in conjunction with preferred embodiments and accompanying drawings, further clarifies the present utility model. Those skilled in the art should understand that the specific description below is illustrative rather than restrictive and should not be construed as limiting the scope of protection of this utility model.

[0035] Example 1

[0036] Energy equipment (steam turbines, gas turbines, wind turbines) typically includes high-voltage shut-off solenoid valves, mechanical shutdown solenoid valves, quick-closing solenoid valves, and active test solenoid valves, such as... Figure 1 As shown, control commands are transmitted to the field solenoid valves via relays, fuses, and cables in the relay cabinet, thereby controlling the safe operation of the energy equipment. During normal operation, the solenoid valves of the energy equipment are of two types: normally energized and normally de-energized.

[0037] Taking a steam turbine as an example, to prevent equipment damage caused by turbine overspeed, the turbine control system typically includes electrical overspeed protection and mechanical overspeed protection. Mechanical overspeed protection is the last line of defense against electrical overspeed protection failure; when mechanical overspeed activates, the turbine safely shuts down. During routine turbine operation, to verify the reliability of mechanical overspeed protection, periodic oil injection tests and mechanical overspeed tests are performed. These tests involve energizing the isolation solenoid valve, the turbine speed exceeding the mechanical overspeed protection value, or energizing the oil injection test solenoid valve, triggering the mechanical overspeed protection. Even though the mechanical overspeed protection activates, the unit continues to operate normally. Therefore, the isolation solenoid valve must not be energized during normal operation; otherwise, the mechanical overspeed protection will fail. This demonstrates that if the isolation solenoid valve is energized under other operating conditions, the unit will be in a very dangerous state.

[0038] If the turbine generator unit is operating at full load and the fast-closing solenoid valve is energized, all turbine control valves will close, preventing steam from entering the turbine. The turbine generator will then become a motor, resulting in a safety accident due to reverse power operation.

[0039] If the steam turbine needs to enter an emergency shutdown condition, but the high-pressure shut-off solenoid valve is energized and the fast-closing solenoid valve is de-energized, the steam turbine cannot be shut down, which could lead to a greater safety accident.

[0040] In short, if the operation of these solenoid valves is compromised by cyberattacks or malicious manipulation, it could cause major safety incidents to energy equipment.

[0041] Therefore, in order to monitor the entire control circuit of the fuse, cable, and solenoid valve, as well as the operating status of the solenoid valve in real time, this utility model provides an online diagnostic device for the solenoid valve circuit and its safety status in energy equipment. This device connects detection probes in parallel to detection points upstream or downstream of the fuse to achieve real-time monitoring of the safety status of the solenoid valve and its control circuit. Figure 2 , Figure 3 As shown.

[0042] like Figure 4 As shown, this utility model discloses an online diagnostic device for an energy equipment solenoid valve circuit and its safety status. The device includes an FPGA / MCU circuit CT6 and a high-voltage detection circuit CT1, a phase detection circuit CT3, and a discharge detection circuit CT4 connected to the FPGA / MCU circuit CT6. The FPGA / MCU circuit CT6 is used to activate the logic control of the entire online diagnostic device, receive detection signals from each detection circuit, and determine the current state of the solenoid valve. The high-voltage detection circuit CT1 is used to detect whether the solenoid valve control circuit is energized (i.e., to determine...). Figure 1 The circuit detects whether switch K11 in the solenoid valve circuit is closed and transmits the signal to the FPGA / MCU circuit CT6 for processing; the phase detection circuit CT3 is used to output a PWM wave to detect the PWM phase difference of the solenoid valve circuit, and then detect the coil reactance of the solenoid valve to determine whether the solenoid valve coil is intact; the discharge detection circuit CT4 is used to measure the discharge time of the solenoid valve when switch K11 in the solenoid valve circuit is opened, in order to determine the working state of the solenoid valve core.

[0043] like Figure 8 As shown, the workflow for using the above-mentioned online diagnostic device to detect the solenoid valve circuit and its safety status is as follows:

[0044] Step a: Connect the detection probes of the online diagnostic device in parallel to the solenoid valve circuit;

[0045] Step b: The high-voltage detection circuit CT1 detects whether the solenoid valve circuit is energized, and uses the detection result as the input to the state truth table, and then outputs the current state of the solenoid valve.

[0046] Step c: If the solenoid valve circuit loses power, discharge detection is initiated at the moment of power loss (0S). The discharge time of the solenoid valve is detected by the discharge detection circuit CT4 to obtain the working state of the solenoid valve core.

[0047] Step d: When the solenoid valve circuit loses power for 1000ms, the phase detection circuit CT3 starts phase detection, inputs an excitation source to the solenoid valve circuit to detect its phase difference, and then obtains the solenoid valve reactance based on the phase difference to determine whether the solenoid valve coil is intact.

[0048] The online diagnostic device of this invention can detect the voltage of the object under test when the solenoid valve is energized; and actively measure the inductance of the object under test by inputting a low voltage excitation signal to the object under test when the solenoid valve is de-energized, thereby realizing online diagnosis of the solenoid valve circuit and its installation status. Since the detection device adopts a parallel connection to the circuit, the risk of the detection device interfering with the control system of the object under test is reduced.

[0049] Example 2

[0050] This embodiment proposes an energy equipment solenoid valve circuit and its online safety status diagnostic device, which differs from Embodiment 1 in the following ways:

[0051] In this embodiment, the online diagnostic device also includes a storage circuit CT5, which is connected to the FPGA / MCU circuit CT6. CT5 stores the solenoid valve energization / de-energization truth tables for various operating conditions of the energy equipment, as well as the configuration information of the entire device. The FPGA / MCU circuit CT6 matches the output signal of the high-voltage detection circuit CT1 with the solenoid valve status truth table to obtain the current status of the solenoid valve. This device can be applied to the status detection of multiple solenoid valves, and, combined with the solenoid valve operating truth table, can assess the safety risks of the energy equipment in real time.

[0052] Furthermore, the online diagnostic device also includes an alarm output circuit CT2, which is used to output the alarm signal after the FPGA / MCU circuit CT6 has voted.

[0053] Furthermore, the online diagnostic device also includes a communication circuit CT7, which is used to communicate with other devices and collect operating status information of the energy equipment.

[0054] In this embodiment, the online diagnostic device also includes a power supply circuit CT8, an FPGA / MCU circuit CT6, a high-voltage detection circuit CT1, an alarm output circuit CT2, a phase detection circuit CT3, a storage circuit CT5, a communication circuit CT7, and a discharge detection circuit CT4, all of which are connected to the power supply circuit CT8 to provide power.

[0055] like Figure 9 As shown, the workflow for applying this device to the safety status monitoring of energy equipment is as follows:

[0056] Step 1: Based on the solenoid valve's operating type (normally energized / normally de-energized), connect the detection probes of the online diagnostic device in parallel to the upstream or downstream detection points of the fuse in the solenoid valve circuit; for example... Figure 2 , Figure 3 As shown in the detection point diagram, when the solenoid valve is in the normally energized mode, the detection point is located downstream of the fuse; when the solenoid valve is in the normally de-energized mode, the detection point is located upstream of the fuse.

[0057] Step two, forced relay cabinet control instruction, control the switch K11 in the electromagnetic valve circuit Figure 1 ) instruction, let the electromagnetic valve receive power / power loss, to calibrate the A / D code value of the discharge detection circuit and the PWM phase difference of the phase detection circuit in the online diagnosis device;

[0058] Step three, store the A / D code value of the discharge detection circuit and the PWM phase difference of the phase detection circuit of each detection channel to the storage chip;

[0059] Step four, configure the state truth table of all electromagnetic valves of the energy equipment under various working conditions, and store the parameters in the storage chip; Table 1 below is an example of the electromagnetic valve power-on state truth table:

[0060] Table 1 Electromagnetic valve power-on state truth table

[0061]

[0062] Step five, combine the method of steps c to d in example 1 to detect the electromagnetic valve circuit and its safety state, combine the detection results with the state truth table to vote the safety state of the energy equipment, and also can be transmitted to other network security system through communication protocol, if there is network attack or illegal operation, through the alarm circuit Real-time early warning.

[0063] The circuit structure of the high voltage detection circuit CT1, the phase detection circuit CT3 and the discharge detection circuit CT4 in the online diagnosis device will be described in detail below.

[0064] Specifically, as shown in Figure 5 , the high voltage detection circuit CT1 includes photoelectric coupler U27 (TPL281), thyristor IRF2 (IRF_SI2312) and photoelectric coupler U29 (TPL281). The device model in the bracket is only an example, and simple models based on the same principle are also within the protection scope of the present application.

[0065] Among them, the first pin of photoelectric coupler U27 (TPL281) is connected with 3.3V input power through resistor R63; the second pin is connected with HVPWM control pin, which is used to adjust the pulse to control the switching state of the light emitting diode in photoelectric coupler U27; the third pin is connected with HVDCN control pin through resistor R67, and the fourth pin is connected with the D pin of thyristor IRF2 (IRF_SI2312), which is used to convert the low voltage HVPWM (frequency is 10KHz, duty cycle is 4.5%) into the gate control signal of IRF2 connected with the control circuit and input high voltage drive 220VDC into the circuit, and then reduce the 220VDC control loop voltage to 10VDC.

[0066] The 1st pin of the optocoupler U29 (TPL281) is connected with the resistor R73, the 2nd pin is connected with HVDCN, and drives the optocoupler U29 through a filter circuit composed of the inductor L2 and the capacitor C26, controls the light emitting diode switching state; the 4th pin is connected with HVSIG, and is used for transmitting signals into the FPGA / MCU circuit (CT6).

[0067] As shown in Figure 6 The phase detection circuit CT3 comprises the optocoupler U28 (TPL281) and the thyristor IRF1 (IRF_SI2312).

[0068] The fuse F2 is connected with the 5V input power supply, and is used for protecting the input power supply; the D pin of the thyristor IRF1 (IRF_SI2312) is connected with the diode D35, and the G pin is connected with the PHYPWM control pin, and is used for inputting the PWM excitation signal (the peak value is 5VDC, the frequency is 100Hz, and the duty cycle is 50%) into the electromagnetic valve in the off state.

[0069] The 1st pin of the optocoupler U28 (TPL281) is connected with the S pin of the thyristor IRF1 (IRF_SI2312), and the 4th pin is connected with the CAPSIG end, and is used for transmitting the PMW signal of the loop into the FPGA / MCU circuit CT6, and the FPGA / MCU circuit CT6 calculates the inductance of the electromagnetic valve through the phase difference between PHYPWM and the feedback CAPSIG signal.

[0070] As shown in Figure 7 The discharge detection circuit CT4 comprises the AD8211 instrument amplifier, wherein the 1st pin of the AD8211 instrument amplifier is connected with the resistor R71, the 4th pin is connected with HVDCP through the resistor R70, and is used for receiving the differential signal, and the 7th pin of the AD8211 instrument amplifier is connected with the AISIG end. When the electromagnetic valve is in the off state, the electromagnetic valve, the freewheeling diode D33 and the cement resistor R66 (100 ohms, power 1W) form a discharge loop, and pass through the π-type filter circuit composed of the inductor L1, the capacitor C23 and the capacitor C24; and then pass through the sampling resistor R69 and the instrument amplifier, and transmit the discharge electric quantity into the FPGA / MCU circuit CT6 to perform A / D conversion, and calculate the discharge electric quantity and the valve core working state of the electromagnetic valve.

[0071] The above is only a preferred embodiment of the present application, and does not limit the present application in any form, and any simple modification, equivalent change made according to the technical essence of the present application to the above embodiment, all falls within the protection scope of the present application.

Claims

1. An energy equipment solenoid valve circuit and its online safety status diagnostic device, characterized in that, include: The system includes an FPGA / MCU circuit (CT6) and electrically connected high-voltage detection circuit (CT1), phase detection circuit (CT3), and discharge detection circuit (CT4). The FPGA / MCU circuit is used for the logic control of the entire device. The high-voltage detection circuit (CT1) is used to detect whether the solenoid valve control circuit is energized and transmits the signal to the FPGA / MCU circuit (CT6) for processing. The phase detection circuit (CT3) is used to output a PWM wave to the solenoid valve and detect its phase difference, thereby detecting the coil reactance of the solenoid valve to determine whether the solenoid valve coil is intact. The discharge detection circuit (CT4) is used to measure the discharge time of the solenoid valve at the moment the solenoid valve circuit is de-energized to determine the working state of the solenoid valve core.

2. The energy equipment solenoid valve circuit and its online safety status diagnostic device as described in claim 1, characterized in that, It also includes an alarm output circuit (CT2) connected to the FPGA / MCU circuit (CT6), which is used to output an alarm signal after the FPGA / MCU circuit (CT6) has voted.

3. The energy equipment solenoid valve circuit and its online safety status diagnostic device as described in claim 1, characterized in that, It also includes a storage circuit (CT5) connected to the FPGA / MCU circuit (CT6), which is used to store the truth table of the solenoid valve energization status under various operating conditions of the energy equipment and the configuration information of the entire device.

4. The energy equipment solenoid valve circuit and its online safety status diagnostic device as described in claim 1, characterized in that, It also includes a communication circuit (CT7) connected to the FPGA / MCU circuit (CT6), which is used to communicate with other devices to collect operating condition information of the energy equipment.

5. The energy equipment solenoid valve circuit and its online safety status diagnostic device as described in claim 1, characterized in that, The high-voltage detection circuit (CT1) includes an optocoupler U27, a thyristor IRF2, and an optocoupler U29. The first pin of the optocoupler U27 is connected to the input power supply via resistor R63. The second pin is connected to the HVPWM control pin to adjust the pulse and control the switching state of the LED inside the optocoupler U27. The third pin of the optocoupler U27 is connected to HVDCN via resistor R67, and the fourth pin is connected to the D pin of the thyristor IRF2.

6. The energy equipment solenoid valve circuit and its online safety status diagnostic device as described in claim 5, characterized in that, The first pin of the optocoupler U29 is connected to resistor R73, the second pin is connected to HVDCN, and the optocoupler U29 is driven by a filter circuit composed of inductor L2 and capacitor C26 to control the switching state of its light-emitting diode; the fourth pin of the optocoupler U29 is connected to HVSIG to transmit signals to the FPGA / MCU circuit (CT6).

7. The energy equipment solenoid valve circuit and its online safety status diagnostic device as described in claim 1, characterized in that, The phase detection circuit (CT3) includes an optocoupler U28 and a thyristor IRF1; the D pin of the thyristor IRF1 is connected to the diode D35, and the G pin is connected to the PHYPWM control pin, which is used to provide a PWM excitation signal to the solenoid valve in the power-off state; the first pin of the optocoupler U28 is connected to the S pin of the thyristor IRF1, and the fourth pin is connected to the CAPSIG terminal, which is used to transmit the PMW signal of the solenoid valve circuit to the FPGA / MCU circuit (CT6).

8. The energy equipment solenoid valve circuit and its online safety status diagnostic device as described in claim 1, characterized in that, The discharge detection circuit (CT4) includes an instrumentation amplifier. The first pin of the instrumentation amplifier is connected to a resistor R71, the fourth pin is connected to HVDCP via a resistor R70, and the seventh pin is connected to the AISIG terminal.

9. The energy equipment solenoid valve circuit and its online safety status diagnostic device as described in claim 8, characterized in that, When the solenoid valve loses power, the solenoid valve, together with the freewheeling diode D33 and cement resistor R66 in the discharge detection circuit (CT4), form a discharge circuit. The discharge circuit is then connected to the FPGA / MCU circuit (CT6) through the inductor L1, capacitor C23, and capacitor C24 forming a π-type filter circuit. Finally, the discharge amount is transmitted to the FPGA / MCU circuit (CT6) through the sampling resistor R69 and the instrumentation amplifier.

10. An energy equipment solenoid valve circuit and its online safety status diagnostic device as described in any one of claims 1 to 9, characterized in that, The detection probe of the device is connected in parallel in the solenoid valve circuit; when the solenoid valve is in the normal energized state, the detection probe is connected in parallel downstream of the fuse in the solenoid valve circuit; when the solenoid valve is in the normal de-energized state, the detection probe is connected in parallel upstream of the fuse in the solenoid valve circuit.

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