Sampling circuits, circuit boards, systems and electronic equipment

Abstract

This application discloses a sampling circuit, circuit board, system, and electronic device, relating to the field of signal sampling. The sampling circuit includes a current transformer, a phase current sampling module, and a zero-sequence current sampling module. The current transformer includes a first input pin, a second input pin, a first output pin, and a second output pin. The phase current sampling module includes multiple single coils and multiple first resistors, with each single coil corresponding to one of the multiple first resistors. One end of each single coil is electrically connected to a second input pin, and the other end of each single coil is electrically connected to the first input pin and grounded through a corresponding first resistor. The zero-sequence current sampling module includes a second resistor, one end of which is electrically connected to a first output pin, and the other end of which is grounded and electrically connected to the second output pin. By introducing a current transformer, the phase current and zero-sequence current share a common ground in the same circuit.

Description

Technical Field

[0001] This application relates to the field of signal sampling, and in particular to a sampling circuit, circuit board, system, and electronic device. Background Technology

[0002] In existing 10kV grid sampling equipment, the sampling device generally uses a dual-coil scheme containing two sampling circuits to achieve the common ground of phase current and zero current. However, this scheme requires more coils and complicated wiring harnesses, resulting in higher labor costs, making it difficult to centrally manage. In addition, it is large in size and requires higher production costs. Utility Model Content

[0003] This application aims to at least solve one of the technical problems existing in the prior art. To this end, this application proposes a sampling circuit that can realize the common ground of the phase current and zero current using only one sampling circuit scheme.

[0004] This application also proposes a circuit board having the above-described sampling circuit.

[0005] This application also proposes a system having the above-described circuit board.

[0006] This application also proposes an electronic device having the above-described system.

[0007] The sampling circuit according to a first aspect embodiment of this application includes:

[0008] A current transformer, the current transformer including a first input pin, a second input pin, a first output pin and a second output pin;

[0009] A phase current sampling module includes multiple single coils and multiple first resistors. Each single coil corresponds to one of the multiple first resistors. One end of each single coil is electrically connected to a second input pin. The other end of each single coil is electrically connected to the first input pin through the corresponding first resistor and grounded. The single coil is used to sense and transmit the phase current signal of the external circuit.

[0010] A zero-sequence current sampling module includes a second resistor, one end of which is electrically connected to the first output pin, and the other end of which is grounded and electrically connected to the second output pin.

[0011] The sampling circuit according to the embodiments of this application has at least the following beneficial effects: by using a current transformer, the electrical connection between the zero-sequence current sampling module and the phase current sampling module is realized, thereby reducing the amount of coil used, reducing production costs, simplifying the overall circuit, and reducing production costs. At the same time, the current transformer also isolates the zero-sequence current sampling module and the phase current sampling module, enabling the phase current sampling module and the zero-sequence current sampling module to achieve a common ground. By combining the first resistor with the current transformer, the phase current signal introduced by the external circuit through a single coil can be sampled. By combining the second resistor with the current transformer, the zero-sequence current signal generated by the phase current signal can be sampled.

[0012] According to some embodiments of this application, a terminal block is also included, through which the single coil is electrically connected to the first resistor, and the second resistor is electrically connected to the first output pin and the second output pin through the terminal block, wherein the terminal block is used for concentrating the circuit.

[0013] According to some embodiments of this application, a load-side phase voltage circuit module is also included. The load-side phase voltage circuit module includes a plurality of first capacitors, which are used to correspond one-to-one with the external load-side phase voltage. One end of the plurality of first capacitors is short-circuited and electrically connected to the terminal block. The other end of each first capacitor is used to be electrically connected to the corresponding external load-side phase voltage. The load-side phase voltage circuit is used to monitor the three-phase voltage signal on the load side.

[0014] According to some embodiments of this application, a zero-sequence voltage loop module is also included. The zero-sequence voltage loop module includes a second capacitor, one end of which is grounded, and the other end of which is electrically connected to the short-circuit terminals of a plurality of first capacitors through the terminal block. The zero-sequence voltage loop module is used to monitor the zero-sequence voltage signal generated in the load-side phase voltage loop.

[0015] According to some embodiments of this application, a power supply side phase voltage loop module is also included. The power supply side phase voltage loop module includes a plurality of third capacitors, which are used to correspond one-to-one with the external power supply side phase voltage. One end of the plurality of third capacitors is grounded through the terminal block, and the other end of each third capacitor is used to be electrically connected to the corresponding external power supply side phase voltage. The power supply side phase voltage loop is used to monitor and sample the three-phase voltage signal of the power supply side.

[0016] According to some embodiments of this application, the current transformer further includes a grounding pin, which is grounded through the terminal block.

[0017] According to some embodiments of this application, the number of the single coil and the first resistor are both three and correspond one-to-one.

[0018] The circuit board according to a second aspect embodiment of this application includes:

[0019] The sampling circuit of the first aspect of this application.

[0020] The system according to a third aspect embodiment of this application includes:

[0021] The circuit board of the second aspect of this application.

[0022] An electronic device according to a fourth aspect of this application includes:

[0023] The system of the third aspect of this application.

[0024] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0025] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0026] Figure 1 This is a schematic diagram of the sampling circuit according to an embodiment of this application;

[0027] Figure 2 This is a schematic diagram of a terminal block according to an embodiment of this application;

[0028] Figure 3 This is a schematic diagram of a prior art dual-coil circuit;

[0029] Figure 4 This is a circuit diagram of the load-side phase circuit and the zero-sequence voltage circuit according to an embodiment of this application;

[0030] Figure 5 This is a circuit diagram of the power supply side phase loop according to an embodiment of this application;

[0031] Figure 6 This is a schematic diagram of the external pins of the current transformer according to an embodiment of this application. Detailed Implementation

[0032] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0033] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0034] In the description of this application, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0035] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0036] Currently, referring to Figure 3 In 10kV grid sampling equipment, for the common grounding of phase current and zero-sequence current, the existing market generally uses two circuits to achieve separate common grounding. However, since the zero-sequence current itself measures the zero-sequence current signal generated by the phase current, the current part of the zero-sequence current also needs to be introduced into the phase current signal through the coil. Therefore, the required number of coils is large, which will increase the production cost. In addition, the circuit is more complicated, and the labor cost required for installation will also increase accordingly.

[0037] Based on this, this application proposes a sampling circuit that uses a circuit transformer to electrically connect the zero-sequence current sampling module and the phase current sampling module while also achieving isolation, avoiding short circuits when the zero-sequence current and phase current share the same ground, thus preventing them from affecting their function. At the same time, it reduces the number of coils used, lowers production costs, and reduces the complexity of the wiring harness.

[0038] The following reference Figure 1 and Figure 6 The sampling circuit of an embodiment of this application is described.

[0039] It is understood that the sampling circuit of this application embodiment includes: a current transformer, a phase current sampling module, and a zero-sequence current sampling module. The current transformer includes a first input pin, a second input pin, a first output pin, and a second output pin. The phase current sampling module includes multiple single coils and multiple first resistors, with each single coil corresponding to one of the multiple first resistors. One end of each single coil is electrically connected to a second input pin, and the other end of each single coil is electrically connected to the first input pin and grounded through a corresponding first resistor. The single coil is used to sense and transmit the phase current signal of the external circuit. The zero-sequence current sampling module includes a second resistor, one end of which is electrically connected to a first output pin, and the other end of which is grounded and electrically connected to the second output pin.

[0040] The beneficial effects of the sampling circuit in this application embodiment are as follows: by using a current transformer, the electrical connection between the zero-sequence current sampling module and the phase current sampling module is realized, thereby reducing the amount of coil used, reducing production costs, simplifying the overall circuit, and reducing production costs. At the same time, the current transformer also isolates the zero-sequence current sampling module and the phase current sampling module, enabling the phase current sampling module and the zero-sequence current sampling module to achieve a common ground. By combining the first resistor with the current transformer, the phase current signal introduced by the external circuit through a single coil can be sampled. By combining the second resistor with the current transformer, the zero-sequence current signal generated by the phase current signal can be sampled.

[0041] For example, in some embodiments, reference is made to Figure 1 and Figure 6In this embodiment, the external sidewall of the current transformer is provided with a first input pin, a second input pin, a first output pin, and a second output pin. The internal structure of the current transformer includes a primary coil and a secondary coil. The first and second input pins are electrically connected to the two ends of the primary coil, and the first and second output pins are electrically connected to the two ends of the secondary coil. The phase current sampling module is composed of three single coils and three first resistors in a one-to-one correspondence. The external circuit specifically refers to a 10kV pole-mounted vacuum load switch (not shown in the attached figure). The 10kV pole-mounted vacuum load switch includes an A-phase cable, a B-phase cable, a C-phase cable, and an electrical box. The A-phase cable, B-phase cable, and C-phase cable... The cables have corresponding inlet and outlet terminals at both ends. Phase A, Phase B, and Phase C cables enter the electrical box through their respective inlet terminals, forming a three-phase common-box structure. Inside the box, the Phase A, Phase B, and Phase C cables each have their corresponding primary coils (A-phase, B-phase, and C-phase, respectively). The Phase A, Phase B, and Phase C cables then extend outside the box through their corresponding outlet terminals and connect to the power distribution line. This application uses three single coils as secondary coil terminals, electrically connected to the primary coils of Phase A, Phase B, and Phase C, respectively. The current in the primary coils of Phase A, Phase B, and Phase C will be induced to... On the corresponding single coils, the A-phase current, B-phase current, and C-phase current are respectively introduced into the phase current sampling module through three single coils. A first resistor is set to measure the voltage across its terminals, and the corresponding phase current magnitude is calculated based on the resistance value. One end of each of the three single coils is electrically connected to the first input pin and grounded through the corresponding first resistor, and the other end is electrically connected to the second input pin. This allows the zero-sequence current generated by the phase current introduced by the phase current sampling module to be input into the primary coil through the first and second input pins. The secondary coil is electrically connected to the second resistor through the first and second output pins. The second resistor is set to measure the voltage across the secondary coil. The voltage across the two ends of the resistor is measured, and the corresponding zero-sequence current is calculated by combining the resistance value of the second resistor. The end of the second resistor that is electrically connected to the second output pin is grounded. By setting a current transformer, the phase current sampling module can be electrically connected to the zero-sequence current sampling module through the current transformer. This allows the current signal introduced from the phase current sampling module by the primary coil to be transmitted to the zero-sequence current sampling module through the secondary coil. This achieves zero-sequence current signal sampling while reducing the number of single coils used, thereby reducing production costs. In addition, the current transformer isolates the second resistor from the phase current sampling module, instead of directly connecting them in series with a common ground, effectively avoiding the short circuit caused by direct series connection with a common ground.

[0042] It should be noted that: the first resistor of the zero-sequence current sampling module is matched with the three single coils and the corresponding three first resistors of the phase current sampling module, and the external circuit can also be a 10KV pole-mounted vacuum circuit breaker.

[0043] It is understood that the sampling circuit of this application also includes a terminal block, a single coil is electrically connected to a first resistor through the terminal block, and a second resistor is electrically connected to a first output pin and a second output pin through the terminal block. The terminal block is used for centralized circuitry.

[0044] For example, in some embodiments, reference is made to Figure 2 In this embodiment, the terminal block has 24 pins. Three first resistors (R1, R2, and R3) are located inside the terminal block. One end of each of the three single coils is electrically connected to the corresponding three first resistors via pins 20, 22, and 24, respectively. The other end of each single coil is electrically connected to the second input pin via pins 18, 16, and 14, respectively. Pins 17, 15, and 13 are internally shorted. The other end of each of the three first resistors is electrically connected to the first input pin via pins 17, 15, and 13, respectively. The second resistor... Also located inside the terminal block (not shown in the attached diagram), one end of the second resistor is electrically connected to the first output pin via pin 11, and the other end of the second resistor is electrically connected to the second output pin via pin 9. Pins 24, 22, and 20 are respectively shorted to the internal terminals of pins 23, 21, and 19. By setting up the terminal block, the circuits of each module can be more centralized and easier to manage. At the same time, setting some circuits inside the terminal block makes the external circuits simpler, reduces installation difficulty, reduces labor costs, and reduces product size, so that it can be used in a wider range of scenarios.

[0045] It should be noted that: Figure 2 Pins 7 and 5 are shorted and defined as U, pins 6, 4 and 2 are shorted and defined as U2N. U2N is shorted with U as shown in the figure. Similarly, pins 1 and 3 are grounded and defined as GND, and pins 12, 10 and 8 are shorted and defined as U1N. U1N is shorted with GND as shown in the figure.

[0046] It is understood that the sampling circuit of this application also includes a load-side phase voltage loop module. The load-side phase voltage loop module includes multiple first capacitors, which correspond one-to-one with the external load-side phase voltage. One end of each of the multiple first capacitors is shorted and electrically connected to the terminal block. The other end of each first capacitor is electrically connected to the corresponding external load-side phase voltage. The load-side phase voltage loop is used to monitor the three-phase voltage signal on the load side.

[0047] For example, in some embodiments, reference is made to Figure 4In this embodiment, the external load-side voltage specifically refers to the phase voltages A2, B2, and C2 of the A-phase output terminal, B-phase output terminal, and C-phase output terminal of the 10KV pole-mounted vacuum load switch. A2, B2, and C2 correspond one-to-one with three first capacitors. A2, B2, and C2 are electrically connected to pins 6, 4, and 2 of the terminal block through their corresponding first capacitors. The internal circuits of pins 6, 4, and 2 are shorted. By setting up a load-side phase voltage circuit module, the signals of the three-phase voltage output terminals of the 10KV pole-mounted vacuum load switch are detected to understand the status of the circuit.

[0048] It is understood that the sampling circuit of this application also includes a zero-sequence voltage loop module. The zero-sequence voltage loop module includes a second capacitor, one end of which is grounded, and the other end of which is electrically connected to the short-circuit terminals of multiple first capacitors through a terminal block. The zero-sequence voltage loop module is used to monitor the zero-sequence voltage signal generated in the load-side phase voltage loop.

[0049] For example, in some embodiments, reference is made to Figure 4 In this embodiment, one end of the second capacitor is grounded through pin 3 of the terminal block, and the other end is electrically connected to the load-side phase voltage loop module through pin 5. Pin 5 is internally shorted with pin 6, pin 4 and pin 2, and pin 5 is also internally shorted with pin 7. By setting up the zero-sequence voltage loop module, the zero-sequence voltage generated by the load-side phase voltage can be monitored and sampled.

[0050] It is understood that the sampling circuit in this application embodiment further includes a power supply side phase voltage loop module. The power supply side phase voltage loop module includes multiple third capacitors, which are used to correspond one-to-one with the external power supply side phase voltage. One end of each of the multiple third capacitors is grounded through a terminal block, and the other end of each third capacitor is used to be electrically connected to the corresponding external power supply side phase voltage. The power supply side phase voltage loop is used to monitor and sample the three-phase voltage signal of the power supply side.

[0051] For example, in some embodiments, reference is made to Figure 5 In this embodiment, the external power supply side voltage specifically refers to the phase voltages A1, B1, and C1 of the 10KV pole-mounted vacuum load switch's A-phase input terminal, B1, and C1. A1, B1, and C1 correspond one-to-one with three third capacitors. A1, B1, and C1 are electrically connected to pins 12, 10, and 8 of the terminal block through their respective third capacitors. Pins 12, 10, and 8 are internally shorted and grounded by shorting to pin 3. By setting up a voltage-side phase voltage loop module, the three-phase voltage input terminal signals of the 10KV pole-mounted vacuum load switch are detected to understand the status of the circuit.

[0052] It is understandable that current transformers also include grounding pins, which are grounded through terminal blocks.

[0053] For example, in some embodiments, reference is made to Figure 2 and Figure 6 In this embodiment, the grounding pin is electrically connected to pin 1, and pin 1 is shorted to pin 3. Therefore, the grounding pin is grounded through pin 1. By setting a grounding pin for the current transformer, the electrical safety performance of the equipment is improved.

[0054] It is understandable that there are three single coils and three first resistors, and they correspond one-to-one.

[0055] For example, in some embodiments, reference is made to Figure 1 In this embodiment, by setting three single coils and three corresponding first resistors, the sampling circuit is able to accurately sample the current of each phase of the three-phase current.

[0056] The circuit board according to the second aspect embodiment of the application includes the sampling circuit of the first aspect embodiment of the application described above.

[0057] According to the circuit board of this application embodiment, the zero-sequence current sampling module and the phase current sampling module are electrically connected by using a current transformer, thereby reducing the number of coils used, reducing production costs, simplifying the overall circuit, and reducing production costs. At the same time, the current transformer also isolates the zero-sequence current sampling module and the phase current sampling module, enabling the phase current sampling module and the zero-sequence current sampling module to achieve a common ground. By combining the first resistor with the current transformer, the phase current signal introduced by the external circuit through a single coil can be sampled. By combining the second resistor with the current transformer, the zero-sequence current signal generated by the phase current signal can be sampled. By using the sampling circuit of this embodiment, the circuit is simplified and the circuit board is lighter.

[0058] The system according to the third aspect of the application includes the circuit board of the second aspect of the application described above.

[0059] The system according to the embodiments of this application, by using the circuit board of this embodiment, makes the overall installation of the system simpler, reduces the required size, and reduces the cost of the system.

[0060] An electronic device according to a fourth aspect of the application includes the sampling circuit described in the third aspect of the application above.

[0061] The electronic device according to the embodiments of this application reduces the overall size of the electronic device by using the system of this embodiment, thereby reducing the cost required for production.

[0062] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application.

Claims

1. A sampling circuit, characterized in that, include: A current transformer, the current transformer including a first input pin, a second input pin, a first output pin and a second output pin; A phase current sampling module includes multiple single coils and multiple first resistors. Each single coil corresponds to one of the multiple first resistors. One end of each single coil is electrically connected to a second input pin. The other end of each single coil is electrically connected to the first input pin through the corresponding first resistor and grounded. The single coil is used to sense and transmit the phase current signal of the external circuit. A zero-sequence current sampling module includes a second resistor, one end of which is electrically connected to the first output pin, and the other end of which is grounded and electrically connected to the second output pin.

2. The sampling circuit according to claim 1, characterized in that, It also includes a terminal block, through which the single coil is electrically connected to the first resistor, and the second resistor is electrically connected to the first output pin and the second output pin through the terminal block, and the terminal block is used for concentrating the circuit.

3. The sampling circuit according to claim 2, characterized in that, It also includes a load-side phase voltage circuit module, which includes multiple first capacitors. Each of the multiple first capacitors is used to correspond one-to-one with an external load-side phase voltage. One end of each of the multiple first capacitors is short-circuited and electrically connected to the terminal block. The other end of each first capacitor is used to electrically connect to the corresponding external load-side phase voltage. The load-side phase voltage circuit is used to monitor the three-phase voltage signal on the load side.

4. The sampling circuit according to claim 3, characterized in that, It also includes a zero-sequence voltage loop module, which includes a second capacitor. One end of the second capacitor is grounded, and the other end of the second capacitor is electrically connected to the short-circuit terminals of multiple first capacitors through the terminal block. The zero-sequence voltage loop module is used to monitor the zero-sequence voltage signal generated in the load-side phase voltage loop.

5. The sampling circuit according to claim 2, characterized in that, It also includes a power supply side phase voltage loop module, which includes multiple third capacitors. Each of the multiple third capacitors is used to correspond one-to-one with an external power supply side phase voltage. One end of each of the multiple third capacitors is grounded through the terminal block, and the other end of each third capacitor is used to be electrically connected to the corresponding external power supply side phase voltage. The power supply side phase voltage loop is used to monitor and sample the three-phase voltage signal on the power supply side.

6. The sampling circuit according to claim 2, characterized in that, The current transformer also includes a grounding pin, which is grounded through the terminal block.

7. The sampling circuit according to claim 1, characterized in that, The number of each single coil and the first resistor is three, and they correspond one-to-one.

8. A circuit board, characterized in that, include: The sampling circuit according to any one of claims 1 to 7.

9. A system, characterized in that, include: The circuit board as described in claim 8.

10. An electronic device, characterized in that, include: The system as described in claim 9.

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