A non-intrusive instruction monitoring module

Abstract

The utility model discloses a non -interventional instruction monitoring module relates to signal acquisition field, and this non -interventional instruction monitoring module includes: power conversion circuit is used for converting the input 5V voltage to 3.3V voltage, as the working voltage of each circuit, simultaneously generates a midpoint potential 3.3V / 2, current detection circuit is used for detecting starting instruction, and the current signal corresponding to starting instruction is converted into the voltage signal in the range that MCU main control circuit can sample, voltage detection circuit is used for detecting stop instruction, and the voltage signal corresponding to stop instruction is converted into the voltage signal in the range that MCU main control circuit can sample, the utility model has the beneficial effect: the utility model adopts non -interventional sensor, under the premise of not influencing traditional split -and -combine control mode, when the internal circuit of monitoring module fails, will not influence the normal start -stop control function of control system.

Description

Technical Field

[0001] This utility model relates to the field of signal acquisition, specifically a non-intrusive command monitoring module. Background Technology

[0002] In industrial control systems, low-voltage integrated protection devices need to monitor the status of opening and closing commands issued by DCS (Distributed Control System), automatic control interlocking devices, and operating buttons. Traditional monitoring methods often involve direct connection to the control loop, which carries the risk of single-point failure. When the monitoring equipment malfunctions, it may cause the entire control system to fail, seriously affecting the reliable operation of production equipment, thus requiring improvement. Utility Model Content

[0003] The purpose of this invention is to provide a non-intrusive command monitoring module to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, this utility model provides the following technical solution:

[0005] A non-intrusive command monitoring module, comprising:

[0006] The power conversion circuit is used to convert the input 5V voltage to 3.3V voltage as the operating voltage of each circuit, and at the same time generate a midpoint potential of 3.3V / 2.

[0007] The current detection circuit is used to detect the start command and convert the current signal corresponding to the start command into a voltage signal within the range that the MCU main control circuit can sample.

[0008] The voltage detection circuit is used to detect stop commands and convert the voltage signal corresponding to the stop command into a voltage signal within the range that the MCU main control circuit can sample.

[0009] The MCU main control circuit is used to determine whether a start or stop instruction is valid based on changes in the electrical signals output by the current detection circuit and the voltage detection circuit.

[0010] The communication circuit is used to establish communication between the MCU main control circuit and the main device, and to report the valid instructions determined by the MCU main control circuit to the main device.

[0011] The output of the power conversion circuit is connected to the input of the current detection circuit, the input of the voltage detection circuit, the first input of the MCU main control circuit, and the first input of the communication circuit. The output of the current detection circuit is connected to the second input of the main control circuit, the output of the voltage detection circuit is connected to the third input of the main control circuit, and the output of the main control circuit is connected to the second input of the communication circuit.

[0012] As a further embodiment of this utility model: the power conversion circuit includes a voltage regulator U1 and an amplifier U3. The voltage regulator U1 is a TPS76333DBVR. The first terminal of the voltage regulator U1 is connected to a 5V voltage, the second terminal of the voltage regulator U1 is grounded, and the fifth terminal of the voltage regulator U1 outputs a 3.3V voltage. The non-inverting terminal of the amplifier U3 is connected to one end of a resistor R5 and one end of a resistor R7. The other end of the resistor R5 is connected to the 3.3V voltage, and the other end of the resistor R7 is grounded. The inverting terminal of the amplifier U3 is connected to the output terminal of the amplifier U3.

[0013] As a further embodiment of this utility model: the current detection circuit includes a current transformer T5 and an amplifier U6. The input side of the current transformer T5 receives the start command. One end of the output side of the current transformer T5 is connected to the positive terminal of diode D8, the negative terminal of diode D9, the non-inverting input of amplifier U6, and a 3.3V / 2 voltage. The other end of the output side of the current transformer T5 is connected to the negative terminal of diode D8, the positive terminal of diode D9, the inverting input of amplifier U6, and one end of resistor R23. The output end of amplifier U6 is connected to the other end of resistor R23 and one end of resistor R29. The other end of resistor R29 is connected to one end of capacitor C16 and the second input terminal of the MCU main control circuit. The other end of capacitor C16 is grounded.

[0014] As a further embodiment of this utility model: the voltage detection circuit includes a current transformer T1 and an amplifier U7. The input side of the current transformer T1 receives a stop command. One end of the output side of the current transformer T1 is connected to a 3.3V / 2 voltage and the non-inverting input of the amplifier U7. The other end of the output side of the current transformer T1 is connected to the inverting input of the amplifier U7 and one end of the resistor R24. The other end of the resistor R24 ​​is connected to one end of the resistor R30 and the output terminal of the amplifier U7. The other end of the resistor R30 is connected to one end of the capacitor C18 and the third input terminal of the MCU main control circuit. The other end of the capacitor C18 is grounded.

[0015] As a further improvement of this utility model: the MCU main control circuit includes chip U2, the model of chip U2 is STM32F030C8T6, pin 18 of chip U2 is connected to the output terminal of the current detection circuit, pin 16 of chip U2 is connected to the output terminal of the voltage detection circuit, and pins 29, 30 and 31 of chip U2 are connected to the second input terminal of the communication circuit.

[0016] As a further improvement of this utility model: the communication circuit includes a chip U4, the model of which is SIT3088EESA. Pins 1, 2, 3, and 4 of the chip U4 are connected to the output of the MCU main control circuit, and pins 6 and 7 of the chip U4 are connected to the main device through resistors R10 and R9, respectively.

[0017] Compared with the prior art, the beneficial effects of this utility model are: This utility model adopts non-intrusive sensors (current transformers T5 and T1), and without affecting the traditional switching control method, when the internal circuit of the monitoring module fails, it will not affect the normal start-stop control function of the control system. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a non-intrusive command monitoring module.

[0019] Figure 2 This is a circuit diagram of a power conversion circuit.

[0020] Figure 3 This is the circuit diagram of the current detection circuit.

[0021] Figure 4 This is the circuit diagram of a voltage detection circuit.

[0022] Figure 5 This is the circuit diagram of the MCU main control circuit.

[0023] Figure 6 This is a circuit diagram for a communication circuit. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the protection scope of the present utility model.

[0025] Please see Figure 1 A non-intrusive command monitoring module, comprising:

[0026] The power conversion circuit is used to convert the input 5V voltage to 3.3V voltage as the operating voltage of each circuit, and at the same time generate a midpoint potential of 3.3V / 2.

[0027] The current detection circuit is used to detect the start command and convert the current signal corresponding to the start command into a voltage signal within the range that the MCU main control circuit can sample.

[0028] The voltage detection circuit is used to detect stop commands and convert the voltage signal corresponding to the stop command into a voltage signal within the range that the MCU main control circuit can sample.

[0029] The MCU main control circuit is used to determine whether a start or stop instruction is valid based on changes in the electrical signals output by the current detection circuit and the voltage detection circuit.

[0030] The communication circuit is used to establish communication between the MCU main control circuit and the main device, and to report the valid instructions determined by the MCU main control circuit to the main device.

[0031] The output of the power conversion circuit is connected to the input of the current detection circuit, the input of the voltage detection circuit, the first input of the MCU main control circuit, and the first input of the communication circuit. The output of the current detection circuit is connected to the second input of the main control circuit, the output of the voltage detection circuit is connected to the third input of the main control circuit, and the output of the main control circuit is connected to the second input of the communication circuit.

[0032] In this embodiment: Please refer to Figure 2 The power conversion circuit includes a voltage regulator U1 and an amplifier U3. The voltage regulator U1 is a TPS76333DBVR. The first terminal of the voltage regulator U1 receives a 5V voltage, the second terminal of the voltage regulator U1 is grounded, and the fifth terminal of the voltage regulator U1 outputs a 3.3V voltage. The non-inverting terminal of the amplifier U3 is connected to one end of resistor R5 and one end of resistor R7. The other end of resistor R5 is connected to the 3.3V voltage, and the other end of resistor R7 is grounded. The inverting terminal of the amplifier U3 is connected to the output terminal of the amplifier U3.

[0033] The voltage regulator U1 converts the input 5V voltage to 3.3V voltage as the working voltage. The 3.3V voltage is divided by two resistors R5 and R7 with the same resistance value to obtain a 3.3V / 2 voltage, which is used as the comparison voltage.

[0034] In this embodiment: Please refer to Figure 3 The current detection circuit includes a current transformer T5 and an amplifier U6. The input side of the current transformer T5 receives the start command. One end of the output side of the current transformer T5 is connected to the positive terminal of diode D8, the negative terminal of diode D9, the non-inverting input of amplifier U6, and a 3.3V / 2 voltage. The other end of the output side of the current transformer T5 is connected to the negative terminal of diode D8, the positive terminal of diode D9, the inverting input of amplifier U6, and one end of resistor R23. The output end of amplifier U6 is connected to the other end of resistor R23 and one end of resistor R29. The other end of resistor R29 is connected to one end of capacitor C16 and the second input terminal of the MCU main control circuit. The other end of capacitor C16 is grounded.

[0035] The start command input terminal is connected in series with the start button being tested. When the start button is pressed, a current is generated. The current generated when the start button is pressed is an alternating current. After being isolated by the current transformer T5 (specification: 5A / 2mA, reduced by 2500 times), it enters the transimpedance amplifier composed of U6 to output a voltage signal. This voltage signal is a 50Hz sine wave that swings between 0V and 3.3V, with the center point at 3.3V / 2.

[0036] In this embodiment: Please refer to Figure 4The voltage detection circuit includes a current transformer T1 and an amplifier U7. The input side of the current transformer T1 receives the stop command. One end of the output side of the current transformer T1 is connected to a 3.3V / 2 voltage, the non-inverting input of the amplifier U7, the other end of the output side of the current transformer T1 is connected to the inverting input of the amplifier U7, one end of the resistor R24, the other end of the resistor R24 ​​is connected to one end of the resistor R30, the output terminal of the amplifier U7, the other end of the resistor R30 is connected to one end of the capacitor C18, the third input terminal of the MCU main control circuit, and the other end of the capacitor C18 is grounded.

[0037] The stop command input terminal is connected in parallel with the stop button being detected. When the stop button is pressed, a voltage is generated. The voltage generated when the stop button is pressed is an AC voltage. After being isolated by resistors R25, R26, R31, R32 and current transformer T1 (specification: 2mA / 2mA), it enters the transimpedance amplifier composed of U6 to output a voltage signal. This voltage signal is a 50Hz sine wave that swings between 0V and 3.3V, with the center point at 3.3V / 2.

[0038] The PT (current transformer T1) and CT (current transformer T5), added for measuring stop and start commands, are designed and applied in accordance with the principles of "minimum load effect" and "electrical isolation." Parallel connection of the PT does not significantly shunt current, and series connection of the CT does not produce a significant voltage drop. This non-invasive measurement method ensures that the introduction, operation, and even damage of the PT and CT will not have any observable impact on the electrical parameters and functional integrity of the original circuit.

[0039] In this embodiment: Please refer to Figure 5 The MCU main control circuit includes chip U2, model STM32F030C8T6. Pin 18 of chip U2 is connected to the output of the current detection circuit, pin 16 of chip U2 is connected to the output of the voltage detection circuit, and pins 29, 30, and 31 of chip U2 are connected to the second input of the communication circuit.

[0040] Chip U2 acquires the current detection signal ADC-I1 and the voltage detection signal ADC-U1 (to determine whether a normal start-up or stop command is issued), and reports them to the master device through the communication circuit via the communication pins RXD, TXD, and UEN.

[0041] In this embodiment: Please refer to Figure 6 The communication circuit includes chip U4, model SIT3088EESA. Pins 1, 2, 3, and 4 of chip U4 are connected to the output of the MCU main control circuit. Pins 6 and 7 of chip U4 are connected to the main device through resistors R10 and R9, respectively.

[0042] The communication circuit described here uses RS485 communication as an example. In actual use, it is not limited to RS485 communication, and can also be WIFI communication, Bluetooth communication, etc.

[0043] The working principle of this utility model is as follows: The power conversion circuit converts the input 5V voltage to 3.3V voltage as the working voltage of each circuit, and at the same time generates a midpoint potential of 3.3V / 2; the current detection circuit detects the start command and converts the current signal corresponding to the start command into a voltage signal within the sampling range of the MCU main control circuit; the voltage detection circuit detects the stop command and converts the voltage signal corresponding to the stop command into a voltage signal within the sampling range of the MCU main control circuit; the MCU main control circuit determines whether the start command or stop command is a valid command based on the changes in the electrical signals output by the current detection circuit and the voltage detection circuit; the communication circuit establishes communication between the MCU main control circuit and the main device, and reports the valid commands determined by the MCU main control circuit to the main device.

[0044] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects.

[0045] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A non-invasive command monitoring module, characterized in that, The non-intrusive command monitoring module includes: The power conversion circuit is used to convert the input 5V voltage to 3.3V voltage as the operating voltage of each circuit, and at the same time generate a midpoint potential of 3.3V / 2. The current detection circuit is used to detect the start command and convert the current signal corresponding to the start command into a voltage signal within the range that the MCU main control circuit can sample. The voltage detection circuit is used to detect stop commands and convert the voltage signal corresponding to the stop command into a voltage signal within the range that the MCU main control circuit can sample. The MCU main control circuit is used to determine whether a start or stop instruction is valid based on changes in the electrical signals output by the current detection circuit and the voltage detection circuit. The communication circuit is used to establish communication between the MCU main control circuit and the main device, and to report the valid instructions determined by the MCU main control circuit to the main device. The output of the power conversion circuit is connected to the input of the current detection circuit, the input of the voltage detection circuit, the first input of the MCU main control circuit, and the first input of the communication circuit. The output of the current detection circuit is connected to the second input of the main control circuit, the output of the voltage detection circuit is connected to the third input of the main control circuit, and the output of the main control circuit is connected to the second input of the communication circuit.

2. The non-intrusive command monitoring module according to claim 1, characterized in that, The power conversion circuit includes a voltage regulator U1 and an amplifier U3. The voltage regulator U1 is a TPS76333DBVR. A 5V voltage is introduced into the first terminal of the voltage regulator U1, the second terminal of the voltage regulator U1 is grounded, and the fifth terminal of the voltage regulator U1 outputs a 3.3V voltage. The non-inverting terminal of the amplifier U3 is connected to one end of resistor R5 and one end of resistor R7. The other end of resistor R5 is connected to the 3.3V voltage, and the other end of resistor R7 is grounded. The inverting terminal of the amplifier U3 is connected to the output terminal of the amplifier U3.

3. The non-intrusive command monitoring module according to claim 1, characterized in that, The current detection circuit includes a current transformer T5 and an amplifier U6. The input side of the current transformer T5 receives the start command. One end of the output side of the current transformer T5 is connected to the positive terminal of diode D8, the negative terminal of diode D9, the non-inverting input of amplifier U6, and a 3.3V / 2 voltage. The other end of the output side of the current transformer T5 is connected to the negative terminal of diode D8, the positive terminal of diode D9, the inverting input of amplifier U6, and one end of resistor R23. The output end of amplifier U6 is connected to the other end of resistor R23 and one end of resistor R29. The other end of resistor R29 is connected to one end of capacitor C16 and the second input terminal of the MCU main control circuit. The other end of capacitor C16 is grounded.

4. The non-intrusive command monitoring module according to claim 1, characterized in that, The voltage detection circuit includes a current transformer T1 and an amplifier U7. The input side of the current transformer T1 receives the stop command. One end of the output side of the current transformer T1 is connected to a 3.3V / 2 voltage and the non-inverting input of the amplifier U7. The other end of the output side of the current transformer T1 is connected to the inverting input of the amplifier U7 and one end of the resistor R24. The other end of the resistor R24 ​​is connected to one end of the resistor R30 and the output terminal of the amplifier U7. The other end of the resistor R30 is connected to one end of the capacitor C18 and the third input terminal of the MCU main control circuit. The other end of the capacitor C18 is grounded.

5. The non-intrusive command monitoring module according to any one of claims 1 to 4, characterized in that, The MCU main control circuit includes chip U2, model STM32F030C8T6. Pin 18 of chip U2 is connected to the output of the current detection circuit, pin 16 of chip U2 is connected to the output of the voltage detection circuit, and pins 29, 30, and 31 of chip U2 are connected to the second input of the communication circuit.

6. The non-intrusive command monitoring module according to claim 5, characterized in that, The communication circuit includes chip U4, model SIT3088EESA. Pins 1, 2, 3, and 4 of chip U4 are connected to the output of the MCU main control circuit. Pins 6 and 7 of chip U4 are connected to the main device through resistors R10 and R9, respectively.

Images