Three-phase current collector

Abstract

The utility model discloses a three-phase current collector which comprises one or more current collection modules. The current acquisition module comprises a resistance-capacitance filter circuit unit and an A / D module; the resistance-capacitance filter circuit unit is used for accessing a three-phase current, filtering the three-phase current and then outputting a current analog signal corresponding to each phase current; the A / D module is used for converting a current analog signal corresponding to each phase of current into a discrete A / D digital signal, and transmitting the A / D digital signal corresponding to each phase of current to the control module through a serial bus; the control module is used for controlling the working state of the current acquisition module, and is also used for sending A / D digital signals corresponding to each phase of current to the upper computer through the Ethernet adapter; according to the utility model, the electromagnetic interference in the three-phase current signal is effectively filtered, the accuracy of the acquired signal is ensured, and the current signal acquisition of a plurality of machining devices is realized at the same time through the arrangement of a plurality of current acquisition modules.

Description

Technical Field

[0001] The utility model relates to the field of current collection, in particular to a three-phase current collector. Background Art

[0002] In the digital factory project, it is necessary to collect the production parameters of the production equipment: production status (operation, standby), processing count and production rhythm. Machining equipment (such as CNC machine tools) is ubiquitous. Usually, the data collection of machine tools is completed through communication protocols, etc. However, in actual situations, the following situations will affect the implementation of equipment data collection: 1. The communication protocol function of the machining equipment requires a high authorization fee (several thousand to tens of thousands / unit) to open; 2. Old machining equipment or manual / semi-automatic machining equipment does not support communication functions; Therefore, it is necessary to find a way to reduce the cost of digital transformation of factory machining equipment and increase the coverage of digital transformation of machining equipment. The current method is to collect the current signal characteristics of the machining equipment and use a series of data processing algorithms based on the current signal characteristics to realize the automatic identification of the equipment production parameters. In this process, the accuracy of automatic identification depends on the acquisition accuracy of the current signal characteristics. In industrial environments, three-phase power systems may face electromagnetic interference problems, which will affect the signal quality. Therefore, the collector needs to design an effective filtering circuit (such as resistor-capacitor filtering) to remove noise and ensure the purity of the collected signal. Utility Model Content

[0003] In order to realize high-precision collection of current signals, the utility model proposes a three-phase current collector, comprising:

[0004] Control module;

[0005] An Ethernet adapter for serial connection to the control module;

[0006] One or more current acquisition modules; the current acquisition module includes a resistor-capacitor filter circuit unit and an A / D module;

[0007] The RC filter circuit unit is used to receive the three-phase current, filter it and output the current analog signal corresponding to each phase current;

[0008] The A / D module is used to convert the current analog signal corresponding to each phase current into a discrete A / D digital signal, and transmit the A / D digital signal corresponding to each phase current to the control module via a serial bus;

[0009] The control module is used to control the working state of the current acquisition module, and is also used to send the A / D digital signal corresponding to each phase current to the host computer through the Ethernet adapter.

[0010] Furthermore, the three-phase current collector also includes:

[0011] The power module is used to provide power to the control module, the Ethernet adapter and each current acquisition module.

[0012] Furthermore, the resistance-capacitance filtering circuit unit comprises:

[0013] A plurality of RC filter circuits; the RC filter circuits correspond to the A phase current, the B phase current, and the C phase current one by one;

[0014] The RC filter circuit is used to receive the corresponding phase current, filter the current, and output the corresponding current analog signal.

[0015] Furthermore, the current acquisition module also includes: a plug-in module J5, which includes:

[0016] A phase current input terminal, used for connecting to the input terminal of the A phase current to be measured;

[0017] The A-phase current reference terminal is used to connect to the output terminal of the A-phase current to be measured.

[0018] Furthermore, the plug-in module J5 also includes:

[0019] A phase B current input terminal, used for connecting to an input terminal of a measured phase B current;

[0020] The B-phase current reference terminal is used to connect to the output terminal of the B-phase current to be measured.

[0021] Furthermore, the plug-in module J5 also includes:

[0022] A C-phase current input terminal, used for connecting to an input terminal of a C-phase current to be measured;

[0023] The C-phase current reference terminal is used to connect to the output terminal of the C-phase current to be measured.

[0024] Furthermore, the RC filter circuit comprises:

[0025] The third-first resistor R31 and the third-seventh resistor R37; one end of the third-first resistor R31 is connected to one end of the third-seventh resistor R37, and the connecting end is also connected to the fourth chip U4 in the A / D module; the other end of the third-first resistor R31 is connected to one end of the second-third resistor R23 and the corresponding current input end in the plug-in module J5; the other end of the third-seventh resistor R37 is connected to one end of the fourth-third resistor R43 and the corresponding current reference end in the plug-in module J5; the other end of the second-third resistor R23 is connected to one end of the fourth-second capacitor C42 and then connected to the fourth chip U4 in the A / D module; the other end of the fourth-third resistor R43 is connected to one end of the fourth-eighth capacitor C48 and then connected to the fourth chip U4 in the A / D module; the other end of the fourth-second capacitor C42 is connected to the other end of the fourth-eighth capacitor C48, and the connecting end is also connected to the fourth chip U4 in the A / D module.

[0026] Compared with the prior art, the present invention has at least the following beneficial effects:

[0027] (1) The utility model includes one or more current acquisition modules; the current acquisition module includes a resistor-capacitor filter circuit unit and an A / D module; the resistor-capacitor filter circuit unit is used to access the three-phase current, and output the current analog signal corresponding to each phase current after filtering; the A / D module is used to convert the current analog signal corresponding to each phase current into a discrete A / D digital signal, and transmit the A / D digital signal corresponding to each phase current to the control module through a serial bus; the control module is used to control the working state of the current acquisition module, and is also used to send the A / D digital signal corresponding to each phase current to the host computer through an Ethernet adapter; that is, the utility model effectively filters out the electromagnetic interference in the three-phase current signal, ensuring that the collected signal is accurate, and at the same time, by setting up multiple current acquisition modules, it realizes the current signal collection of multiple machine processing equipment at the same time;

[0028] (2) The utility model realizes efficient transmission between the A / D module, the control module and the Ethernet adapter through the serial bus;

[0029] (3) High-precision analog-to-digital signal conversion is achieved through the A / D module, improving the resolution and accuracy of current measurement;

[0030] (4) The utility model uses an Ethernet adapter to send the A / D digital signal corresponding to each phase current to the host computer, with a fast transmission rate and a long transmission distance, thus realizing real-time data collection;

[0031] (5) The utility model supports the simultaneous acquisition of multiple currents (A phase current, B phase current, C phase current), thereby improving the efficiency of data acquisition. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a structural diagram of a three-phase current collector;

[0033] Figure 2 This is the circuit diagram corresponding to the current acquisition module;

[0034] Figure 3 It is the circuit diagram corresponding to the resistance-capacitance filter circuit unit in the current acquisition module;

[0035] Figure 4 It is the circuit diagram corresponding to the A / D module in the current acquisition module;

[0036] Figure 5 It is the circuit diagram of the SPI bus interface in the current acquisition module;

[0037] Figure 6 This is the power supply circuit diagram corresponding to the A / D module;

[0038] Figure 7 The module status display circuit diagram corresponding to the A / D module;

[0039] Figure 8 This is the circuit diagram corresponding to the power module;

[0040] Fig. 9 This is the circuit diagram corresponding to the Ethernet adapter;

[0041] Fig.10 This is the circuit diagram corresponding to the network port in the Ethernet adapter;

[0042] Fig.11 The circuit diagram corresponding to the control module;

[0043] Fig.12 It is the circuit diagram corresponding to the reset button in the control module;

[0044] Fig.13 It is the circuit diagram corresponding to the download port in the control module;

[0045] Fig.14 This is the circuit diagram corresponding to the debugging serial port in the control module. DETAILED DESCRIPTION

[0046] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0047] In order to achieve high-precision acquisition of current signals, such as Figure 1 As shown, the utility model proposes a three-phase current collector, comprising:

[0048] Control module;

[0049] like Fig. 9 An Ethernet adapter serially connected to the control module as shown;

[0050] One or more current acquisition modules (in this embodiment, such as Figure 1 As shown, it includes 6 current acquisition modules); Figure 2 As shown, the current acquisition module includes: Figure 3 The RC filter circuit unit shown is similar to Figure 4 The A / D module shown; a current acquisition module corresponding to the current signal of a machining device;

[0051] The current acquisition module also includes: a plug-in module J5; the plug-in module J5 includes:

[0052] A phase current input terminal 1A1+, used to connect to the input terminal of the measured A phase current;

[0053] The A-phase current reference terminal 1A1- is used to connect to the output terminal of the A-phase current to be measured.

[0054] B-phase current input terminal 1B1+, used to connect to the input terminal of the B-phase current to be measured;

[0055] The B-phase current reference terminal 1B1- is used to connect to the output terminal of the B-phase current to be measured.

[0056] The C-phase current input terminal 1C1+ is used to connect to the input terminal of the C-phase current to be measured;

[0057] The C-phase current reference terminal 1C1- is used to connect to the output terminal of the C-phase current to be measured.

[0058] The RC filter circuit unit is used to receive the three-phase current, filter it and output the current analog signal corresponding to each phase current;

[0059] like Figure 3 As shown, the resistance-capacitance filtering circuit unit includes:

[0060] A plurality of RC filter circuits; the RC filter circuits correspond to the A phase current, the B phase current, and the C phase current one by one;

[0061] The RC filter circuit is used to receive the corresponding phase current, filter the current, and output the corresponding current analog signal.

[0062] The RC filter circuit comprises:

[0063] The third-first resistor R31 and the third-seventh resistor R37; one end of the third-first resistor R31 is connected to one end of the third-seventh resistor R37, and the connecting end is also connected to the fourth chip U4 in the A / D module; the other end of the third-first resistor R31 is connected to one end of the second-third resistor R23 and the corresponding current input end in the plug-in module J5; the other end of the third-seventh resistor R37 is connected to one end of the fourth-third resistor R43 and the corresponding current reference end in the plug-in module J5; the other end of the second-third resistor R23 is connected to one end of the fourth-second capacitor C42 and then connected to the fourth chip U4 in the A / D module; the other end of the fourth-third resistor R43 is connected to one end of the fourth-eighth capacitor C48 and then connected to the fourth chip U4 in the A / D module; the other end of the fourth-second capacitor C42 is connected to the other end of the fourth-eighth capacitor C48, and the connecting end is also connected to the fourth chip U4 in the A / D module.

[0064] Specifically, Figure 3 As shown, the resistor-capacitor filter circuit unit includes:

[0065] The RC filter circuit corresponding to the A-phase current (including electronic components: R23, R31, R37, R43, C42, C48);

[0066] The RC filter circuit corresponding to the B-phase current (including electronic components: R24, R32, R38, R44, C43, C49);

[0067] The RC filter circuit corresponding to the C-phase current (including electronic components: R25, R33, R39, R45, C44, C50).

[0068] Specifically, this embodiment takes the RC filter circuit corresponding to the A-phase current as an example for explanation:

[0069] R23, R31, R37, R43, C42 and C48 form a simple RC filter. This filter is usually used to remove the DC component in the AC signal or reduce the noise in a specific frequency range. In this circuit, resistors R23, R31, R37 and R43 are connected in parallel with capacitors C42 and C48 to form two RC filters. These two filters can filter different frequency ranges respectively.

[0070] Specifically, the first RC filter formed by resistor R23 and capacitor C42 can filter out high-frequency signals above a certain cutoff frequency, while the second RC filter formed by resistors R31, R37 and R43 and capacitor C48 can filter out low-frequency signals below another cutoff frequency.

[0071] Therefore, the advantage of this circuit is that it can change the cutoff frequency of the filter by adjusting the value of the resistor and capacitor to adapt to different application scenarios. At the same time, due to the parallel structure, this circuit can also process signals in multiple frequency ranges at the same time, improving the efficiency and accuracy of signal processing.

[0072] Specifically, Figure 2 As shown, the current acquisition module includes:

[0073] like Figure 4 The A / D module shown (consisting of chip U4 and its peripheral circuits);

[0074] like Figure 5 The spi bus interface circuit shown is a serial bus (including electronic components: R9, C12, R11, C20, R13, C25, R16, C32);

[0075] like Figure 6 The power supply of the A / D module shown (including electronic components: C34, C35, C36, C37) is used to provide power to the A / D module.

[0076] like Figure 7 The module status display circuit corresponding to the A / D module shown is used to identify whether the A / D module is working, and includes R19, D5, R21, R26, and Q1 electronic components.

[0077] The A / D module is used to convert the current analog signal corresponding to each phase current into a discrete A / D digital signal, and transmit the A / D digital signal corresponding to each phase current to the control module via a serial bus;

[0078] The control module is used to control the working state of the current acquisition module, and is also used to send the A / D digital signal corresponding to each phase current to the host computer through the Ethernet adapter.

[0079] Specifically, the control module sends the A / D digital signal corresponding to each phase current to the Ethernet adapter through the serial bus, and the Ethernet adapter sends the A / D digital signal corresponding to each phase current to the host computer.

[0080] The Ethernet adapter comprises:

[0081] like Fig.10 The network port shown is used to realize the communication connection between the host computer and the Ethernet adapter.

[0082] like Fig.11 As shown, the control module includes:

[0083] like Fig.12The reset button shown is used to realize the restart power-on function of the control module;

[0084] like Fig.13 The download port shown is used to realize the burning function of the control program corresponding to the control module;

[0085] like Fig.14 The debugging serial port shown is used to realize the download function of the control program;

[0086] The three-phase current collector also includes:

[0087] like Figure 8 The power module shown is used to provide power to the control module, the Ethernet adapter and each current acquisition module.

[0088] The utility model includes one or more current acquisition modules; the current acquisition module includes a resistor-capacitor filter circuit unit and an A / D module; the resistor-capacitor filter circuit unit is used to access the three-phase current, and output the current analog signal corresponding to each phase current after filtering; the A / D module is used to convert the current analog signal corresponding to each phase current into a discrete A / D digital signal, and transmit the A / D digital signal corresponding to each phase current to the control module through a serial bus; the control module is used to control the working state of the current acquisition module, and is also used to send the A / D digital signal corresponding to each phase current to the host computer through an Ethernet adapter; that is, the utility model effectively filters out the electromagnetic interference in the three-phase current signal, ensures that the collected signal is accurate, and at the same time, by setting multiple current acquisition modules, realizes the current signal collection of multiple machine processing equipment at the same time.

[0089] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back...) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0090] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0091] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0092] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A three-phase current collector, characterized in that: include: Control module; An Ethernet adapter for serial connection to the control module; One or more current acquisition modules; The current acquisition module includes a resistance-capacitance filter circuit unit and an A / D module; The RC filter circuit unit is used to receive the three-phase current, filter it and output the current analog signal corresponding to each phase current; The A / D module is used to convert the current analog signal corresponding to each phase current into a discrete A / D digital signal, and transmit the A / D digital signal corresponding to each phase current to the control module via a serial bus; The control module is used to control the working state of the current acquisition module, and is also used to send the A / D digital signal corresponding to each phase current to the host computer through the Ethernet adapter.

2. A three-phase current collector according to claim 1, characterized in that: The three-phase current collector also includes: The power module is used to provide power to the control module, the Ethernet adapter and each current acquisition module.

3. A three-phase current collector according to claim 2, characterized in that: The resistance-capacitance filtering circuit unit comprises: A plurality of RC filter circuits; the RC filter circuits correspond to the A phase current, the B phase current, and the C phase current one by one; The RC filter circuit is used to receive the corresponding phase current, filter the phase current, and output the corresponding current analog signal.

4. A three-phase current collector according to claim 3, characterized in that: The current acquisition module also includes: a plug-in module J5, which includes: A phase current input terminal, used for connecting to the input terminal of the A phase current to be measured; The A-phase current reference terminal is used to connect to the output terminal of the A-phase current to be measured.

5. A three-phase current collector according to claim 4, characterized in that: The plug-in module J5 also includes: A phase B current input terminal, used for connecting to an input terminal of a measured phase B current; The B-phase current reference terminal is used to connect to the output terminal of the B-phase current to be measured.

6. A three-phase current collector according to claim 5, characterized in that: The plug-in module J5 also includes: A C-phase current input terminal, used for connecting to an input terminal of a C-phase current to be measured; The C-phase current reference terminal is used to connect to the output terminal of the C-phase current to be measured.

7. A three-phase current collector according to claim 6, characterized in that: The RC filter circuit comprises: The third-first resistor R31 and the third-seventh resistor R37; one end of the third-first resistor R31 is connected to one end of the third-seventh resistor R37, and the connecting end is also connected to the fourth chip U4 in the A / D module; the other end of the third-first resistor R31 is connected to one end of the second-third resistor R23 and the corresponding current input end in the plug-in module J5; the other end of the third-seventh resistor R37 is connected to one end of the fourth-third resistor R43 and the corresponding current reference end in the plug-in module J5; the other end of the second-third resistor R23 is connected to one end of the fourth-second capacitor C42 and then connected to the fourth chip U4 in the A / D module; the other end of the fourth-third resistor R43 is connected to one end of the fourth-eighth capacitor C48 and then connected to the fourth chip U4 in the A / D module; the other end of the fourth-second capacitor C42 is connected to the other end of the fourth-eighth capacitor C48, and the connecting end is also connected to the fourth chip U4 in the A / D module.

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