Capacitance monitoring equipment

Abstract

The utility model provides a capacitor monitoring device. The capacitor monitoring device comprises a current sampling unit used for collecting current signals flowing through a direct current capacitor or an alternating current capacitor; the alternating-current voltage sampling unit is used for collecting a voltage signal of the alternating-current capacitor; the direct-current voltage sampling unit is used for collecting a voltage signal of the direct-current capacitor; the processing unit is respectively connected with the current sampling unit, the alternating current voltage sampling unit and the direct current voltage sampling unit and is used for acquiring a current signal and a voltage signal of the direct current capacitor and processing the current signal and the voltage signal to obtain a capacitance parameter of the direct current capacitor; and / or the main control chip is used for acquiring a current signal and a voltage signal of the alternating current capacitor and processing the current signal and the voltage signal to obtain capacitance parameters of the alternating current capacitor. The equipment can realize on-site monitoring of the alternating current capacitor and the direct current capacitor, is simple to operate, and reduces the process of manual measurement and calculation of a user, thereby improving the on-site capacitor monitoring efficiency.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, and in particular to a capacitor monitoring device. Background Art

[0002] In high-power power supply equipment, capacitor lifespan is crucial, and users are particularly concerned about effectively predicting capacitor health. This knowledge allows for early replacement of capacitors, preventing sudden damage that could cause equipment failure and power loss to downstream loads.

[0003] Currently, if staff want to detect capacitance during inspections, they need to prepare voltage sampling equipment and current sampling equipment, and then calculate parameters such as capacitance based on the sampled data. This method is cumbersome and will lead to low capacitance detection efficiency during the inspection process. Utility Model Content

[0004] The embodiment of the utility model provides a capacitance monitoring device to solve the problem of low capacitance monitoring efficiency during on-site inspections.

[0005] In a first aspect, an embodiment of the present invention provides a capacitance monitoring device, comprising:

[0006] A current sampling unit for collecting current signals flowing through a DC capacitor or an AC capacitor;

[0007] an AC voltage sampling unit for collecting a voltage signal of the AC capacitor;

[0008] A DC voltage sampling unit for collecting a voltage signal of the DC capacitor;

[0009] and, respectively connected to the current sampling unit, the AC voltage sampling unit and the DC voltage sampling unit, for obtaining the current signal and the voltage signal of the DC capacitor, and processing them to obtain the capacitance parameters of the DC capacitor; and / or, a main control chip for obtaining the current signal and the voltage signal of the AC capacitor, and processing them to obtain the capacitance parameters of the AC capacitor.

[0010] In a possible implementation, the AC voltage sampling unit includes a first voltage signal processing circuit and a three-phase four-wire signal terminal;

[0011] Each phase signal terminal is respectively connected to one end of the corresponding phase AC capacitor, and the N-line signal terminal is connected to the other end of each phase AC capacitor; the first voltage signal processing circuit is respectively connected to the three-phase four-wire signal terminals, and is used to amplify and filter the voltage signal transmitted by the three-phase four-wire signal terminal, and send the processed voltage signal to the main control chip.

[0012] In a possible implementation, the DC voltage sampling unit includes a second voltage signal processing circuit and positive and negative signal terminals;

[0013] The positive and negative signal terminals are respectively connected to the two ends of the DC capacitor; the second voltage signal processing circuit is connected to the positive and negative signal terminals, and is used to amplify and filter the voltage signals transmitted by the positive and negative signal terminals, and send the processed voltage signals to the main control chip.

[0014] In a possible implementation, the current sampling unit includes a plurality of current transformers; each current transformer is connected to the main control chip respectively.

[0015] In a possible implementation, the capacitance monitoring device further includes a current signal processing unit;

[0016] The current signal processing unit is connected to the main control chip and the current transformer respectively, and is used to obtain the current signal sent by the current transformer, and amplify and filter the current signal before sending it to the main control chip.

[0017] In one possible implementation, the capacitance monitoring device includes a display screen;

[0018] The display screen is connected to the main control chip and is used to display the voltage signal, the current signal and the capacitance parameter.

[0019] In one possible implementation, the capacitance monitoring device includes a power conversion module;

[0020] The input end of the power conversion module is connected to an external power supply, and the output end of the power conversion module is respectively connected to the main control chip, the current sampling unit, the AC voltage sampling unit and the DC voltage sampling unit, for supplying power to the main control chip, the current sampling unit, the AC voltage sampling unit and the DC voltage sampling unit.

[0021] In one possible implementation, the capacitance monitoring device further includes a CAN communication interface and an RS485 communication interface; the CAN communication interface and the RS485 communication interface are respectively connected to the main control chip; the main control chip establishes a communication connection with the external device through the CAN communication interface or the RS485 communication interface.

[0022] In a possible implementation, the capacitance monitoring device further includes a fault indicator light;

[0023] The fault indicator light is connected to the main control chip, and the main control chip is used to control the display state of the fault indicator light.

[0024] In a possible implementation, the capacitance monitoring device further includes a device housing; the current sampling unit, the AC voltage sampling unit, the DC voltage sampling unit, and the main control chip are all placed in the device housing.

[0025] The present invention provides a capacitance monitoring device comprising: a current sampling unit for collecting current signals flowing through a DC capacitor or an AC capacitor; an AC voltage sampling unit for collecting voltage signals of the AC capacitor; a DC voltage sampling unit for collecting voltage signals of the DC capacitor; and a main control chip connected to the current sampling unit, the AC voltage sampling unit, and the DC voltage sampling unit, respectively, for obtaining the current signal and voltage signal of the DC capacitor and processing them to obtain capacitance parameters of the DC capacitor; and / or obtaining the current signal and voltage signal of the AC capacitor and processing them to obtain capacitance parameters of the AC capacitor. The device can realize on-site monitoring of AC and DC capacitors, is simple to operate, reduces the user's manual measurement and calculation process, and thus improves the efficiency of on-site capacitance monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0027] Figure 1 It is a structural diagram of a capacitance monitoring device provided by an embodiment of the present utility model;

[0028] Figure 2 This is a schematic diagram of the specific structure of the capacitance monitoring device provided by an embodiment of the present utility model;

[0029] Figure 3 This is a circuit diagram of a DCAC circuit provided by an embodiment of the present utility model;

[0030] Figure 4 It is a schematic diagram of the device housing of the capacitance monitoring device provided by an embodiment of the present utility model. DETAILED DESCRIPTION

[0031] In the following description, specific details such as specific system structures and techniques are provided for purposes of illustration, not limitation, to facilitate a thorough understanding of the embodiments of the present invention. However, it will be apparent to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid obscuring the description of the present invention with unnecessary detail.

[0032] In the description of this application specification and the appended claims, the terms "first", "second", "third", etc. are only used to distinguish the descriptions and cannot be understood as indicating or implying relative importance.

[0033] References to "one embodiment" or "some embodiments" in this specification mean that a particular feature, structure, or characteristic described in conjunction with that embodiment is included in one or more embodiments of the present application. Thus, phrases such as "in one embodiment," "in some embodiments," "in other embodiments," and "in other embodiments" appearing in various places in this specification do not necessarily refer to the same embodiment, but rather mean "one or more but not all embodiments," unless otherwise specifically emphasized. The terms "including," "comprising," "having," and variations thereof all mean "including but not limited to," unless otherwise specifically emphasized.

[0034] In addition, the “plurality” mentioned in the embodiments of the present application should be interpreted as two or more.

[0035] In order to make the purpose, technical solutions and advantages of the present invention more clear, the following will be described through specific embodiments in conjunction with the accompanying drawings.

[0036] Figure 1 This is a schematic diagram of the structure of the capacitance monitoring device provided by the embodiment of the present utility model. Figure 1 As shown, the capacitance monitoring device includes:

[0037] A current sampling unit 20 for collecting current signals flowing through a DC capacitor or an AC capacitor;

[0038] An AC voltage sampling unit 40 for collecting a voltage signal of the AC capacitor;

[0039] A DC voltage sampling unit 30 for collecting the voltage signal of the DC capacitor;

[0040] and, respectively connected to the current sampling unit 20, the AC voltage sampling unit 40 and the DC voltage sampling unit 30, for obtaining the current signal and the voltage signal of the DC capacitor, and processing them to obtain the capacitance parameters of the DC capacitor; and / or, obtaining the current signal and the voltage signal of the AC capacitor, and processing them to obtain the capacitance parameters of the AC capacitor. Main control chip 10.

[0041] In this embodiment, the capacitance monitoring device can collect the current of the DC capacitor and the current of the AC capacitor in the electrical equipment through the current sampling unit 20; the voltage of the AC capacitor in the electrical equipment can be collected through the AC voltage sampling unit 40, and the voltage of the DC capacitor in the electrical equipment can be collected through the DC voltage sampling unit 30.

[0042] Specifically, the capacitor parameters include capacitance C and equivalent series resistance (ESR). After obtaining the voltage and current of the DC capacitor, the main control chip 10 calculates the capacitance and equivalent series resistance based on the voltage and current of the DC capacitor, and calculates the capacitance and equivalent series resistance of the AC capacitor based on the voltage and current of the AC capacitor. The calculation method of the capacitance and equivalent series resistance is conventional and will not be repeated here.

[0043] In this embodiment, the main control chip 10 may be a DSP (Digital Signal Process) chip.

[0044] As can be seen from the above embodiments, the capacitance monitoring device provided by the present invention can realize on-site monitoring of AC capacitance and DC capacitance, is easy to operate, and can reduce the user's manual measurement and calculation process, thereby improving the efficiency of on-site capacitance monitoring.

[0045] In one possible implementation, Figure 2 The specific structural diagram of the capacitance monitoring device provided by the embodiment of the utility model is shown as follows: Figure 2 As shown, the AC voltage sampling unit 40 includes a first voltage signal processing circuit and a three-phase four-wire signal terminal;

[0046] Each phase signal terminal is respectively connected to one end of the corresponding phase AC capacitor, and the N-line signal terminal is connected to the other end of each phase AC capacitor; the first voltage signal processing circuit is respectively connected to the three-phase four-wire signal terminals, and is used to amplify and filter the voltage signal transmitted by the three-phase four-wire signal terminal, and send the processed voltage signal to the main control chip 10.

[0047] In this embodiment, Figure 3A DCAC circuit is shown, in which AC capacitors C1, C2, and C3 are used. To obtain voltage signals from the three-phase AC capacitors, the three-phase signal terminals (A, B, C, and C) are connected to one end of the corresponding AC capacitor, and the N-line signal terminal is connected to the other end of each phase AC capacitor. This allows the acquisition of voltage signals Vc1, Vc2, and Vc3 from the three-phase AC capacitors C1, C2, and C3. The three-phase, four-wire signal terminals transmit the voltage signals to a first voltage signal processing circuit, which processes the voltage signals from each phase.

[0048] Specifically, the first voltage signal processing circuit may include three signal processing circuit modules, each of which includes a first amplifier circuit and a first filter circuit. Specifically, each phase signal terminal is connected to the input of the first amplifier circuit of the corresponding phase, the output of the first amplifier circuit is connected to the input of the first filter circuit of the phase, and the output of the first filter circuit is connected to the main control chip 10. The first amplifier circuit is used to amplify the voltage signal input to the phase, and the first filter circuit is used to filter the voltage signal input to the phase.

[0049] In one possible implementation, Figure 2 As shown, the DC voltage sampling unit 30 includes a second voltage signal processing circuit and positive and negative signal terminals;

[0050] The positive and negative signal terminals are respectively connected to the two ends of the DC capacitor; the second voltage signal processing circuit is connected to the positive and negative signal terminals, and is used to amplify and filter the voltage signals transmitted by the positive and negative signal terminals, and send the processed voltage signals to the main control chip 10.

[0051] In this embodiment, Figure 3 The DC capacitor is C dc ; Get the DC capacitance C dc When the voltage signal is 0, the positive signal terminal is connected to the positive electrode of the DC capacitor, and the negative signal terminal is connected to the negative electrode of the DC capacitor, thereby obtaining the DC capacitor C dc The positive and negative signal terminals transmit the voltage signal to the second voltage signal processing circuit, which processes the voltage signal of the DC capacitor.

[0052] Specifically, the second voltage signal processing circuit may include a second amplifier circuit and a second filter circuit, wherein the positive and negative signal terminals are connected to the input of the second amplifier circuit, the output of the second amplifier circuit is connected to the input of the second filter circuit, and the output of the second filter circuit is connected to the main control chip 10. The second amplifier circuit is used to amplify the voltage signal of the DC capacitor, and the second filter circuit is used to filter the voltage signal of the DC capacitor.

[0053] In a possible implementation, the current sampling unit 20 includes a plurality of current transformers; each current transformer is connected to the main control chip 10 respectively.

[0054] In this embodiment, the current transformer may include a Hall current sensor.

[0055] In a possible implementation, the capacitance monitoring device further includes a current signal processing unit;

[0056] The current signal processing unit is connected to the main control chip 10 and the current transformer respectively, and is used to obtain the current signal sent by the current transformer, amplify and filter the current signal, and then send it to the main control chip 10.

[0057] In this embodiment, the current signal processing unit includes four signal processing circuits, each of which includes a third amplifier circuit and a third filter circuit. The current sampling unit 20 also includes multiple current signal terminals, one end of which is used to connect to the Hall current sensor, and the other end is connected to the input of each corresponding third amplifier circuit. The output of each third amplifier circuit is connected to the input of the corresponding third filter circuit, and the output of each third filter circuit is connected to the main control chip 10.

[0058] Specifically, the Hall current sensor is used to collect the current signal of the DC capacitor and / or AC capacitor (i dc or i c1 、i c2 、i c3 ), and transmits the current signal to the corresponding third amplifier circuit, the third amplifier circuit amplifies the current signal, and sends the amplified current signal to the third filter circuit, the third filter circuit filters the current signal, and sends the filtered current signal to the main control chip 10, thereby improving the signal quality received by the main control chip 10.

[0059] In one possible implementation, the capacitance monitoring device includes a display screen 70;

[0060] The display screen 70 is connected to the main control chip 10 and is used to display the voltage signal, the current signal and the capacitance parameter.

[0061] In this embodiment, the main control chip 10 can determine whether the capacitor to be tested has a fault according to the capacitance parameters. If a fault occurs, the main control chip 10 generates fault information of the capacitor to be tested and displays the fault information on a display screen.

[0062] Specifically, the display screen may be a touch screen, and the user may control the capacitance monitoring process through the display screen.

[0063] In one possible implementation, Figure 2 As shown, the capacitance monitoring device includes a power conversion module 50;

[0064] The input end of the power conversion module 50 is connected to an external power supply, and the output end of the power conversion module 50 is respectively connected to the main control chip 10, the current sampling unit 20, the AC voltage sampling unit 40 and the DC voltage sampling unit 30, for supplying power to the main control chip 10, the current sampling unit 20, the AC voltage sampling unit 40 and the DC voltage sampling unit 30.

[0065] In this embodiment, the power conversion module 50 is an ACDC circuit, which converts the alternating current of the external power source into direct current and provides the direct current to various components of the capacitance monitoring device.

[0066] In one possible implementation, the capacitance monitoring device also includes a CAN communication interface and an RS485 communication interface; the CAN communication interface and the RS485 communication interface are respectively connected to the main control chip 10; the main control chip 10 establishes a communication connection with an external device through the CAN communication interface or the RS485 communication interface.

[0067] In this embodiment, the capacitance monitoring device may further include a wireless communication module, which is used to establish a communication connection with an external device. Specifically, the wireless communication module may be a Wi-Fi module, a Bluetooth module, or the like.

[0068] In one possible implementation, the capacitance monitoring device further includes a fault indicator light 60;

[0069] The fault indicator light 60 is connected to the main control chip 10 , and the main control chip 10 is used to control the display state of the fault indicator light 60 .

[0070] In this embodiment, the main control chip 10 controls the fault indicator light 60 to display red when the capacitor to be tested has a fault, and controls the fault indicator light 60 to display green when the capacitor to be tested has no fault.

[0071] In a possible implementation, the capacitance monitoring device further includes a power light; when the main control chip 10 detects a power signal, it controls the power light to light up.

[0072] In one possible implementation, Figure 4 As shown, the capacitance monitoring device further includes a device housing; the current sampling unit 20, the AC voltage sampling unit 40, the DC voltage sampling unit 30 and the main control chip 10 are all placed in the device housing.

[0073] In this embodiment, the main control chip 10, the current sampling unit 20, the AC voltage sampling unit 40 and the DC voltage sampling unit 30 are all arranged on a circuit board, and the circuit board is installed in the device housing. An opening 801 is provided on any surface of the device housing, and a display screen is installed in the opening 801. Two small circular holes 803 and 804 are provided on any surface of the device housing for installing a power light and a fault indicator light. An opening 802 is also provided on the device housing for leading out positive and negative signal terminals, three-phase four-wire signal terminals and multi-channel current signal terminals; in addition, a lead mounting groove can be provided on the device housing for clamping various signal terminals in the lead mounting groove, which is convenient for the storage and carrying of the capacitor installation equipment.

[0074] It can be seen from the above embodiments that the capacitance monitoring equipment provided in this embodiment can perform on-site monitoring of DC capacitance and AC capacitance, and view the capacitance parameters and fault information obtained by monitoring. It can not only shorten the capacitance monitoring time and improve the efficiency of on-site capacitance monitoring, but the device casing is also convenient for staff to carry and store wire harnesses, which greatly improves the convenience of use for staff.

[0075] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention, and should all be included in the scope of protection of the present invention.

Claims

1. A capacitance monitoring device, characterized in that: include: A current sampling unit for collecting current signals flowing through a DC capacitor or an AC capacitor; an AC voltage sampling unit for collecting a voltage signal of the AC capacitor; A DC voltage sampling unit for collecting a voltage signal of the DC capacitor; and, respectively connected to the current sampling unit, the AC voltage sampling unit and the DC voltage sampling unit, for obtaining the current signal and the voltage signal of the DC capacitor, and processing them to obtain the capacitance parameters of the DC capacitor; and / or, a main control chip for obtaining the current signal and the voltage signal of the AC capacitor, and processing them to obtain the capacitance parameters of the AC capacitor.

2. The capacitance monitoring device according to claim 1, characterized in that: The AC voltage sampling unit includes a first voltage signal processing circuit and a three-phase four-wire signal terminal; Each phase signal terminal is respectively connected to one end of the corresponding phase AC capacitor, and the N-line signal terminal is connected to the other end of each phase AC capacitor; the first voltage signal processing circuit is respectively connected to the three-phase four-wire signal terminals, and is used to amplify and filter the voltage signal transmitted by the three-phase four-wire signal terminal, and send the processed voltage signal to the main control chip.

3. The capacitance monitoring device according to claim 1, wherein: The DC voltage sampling unit includes a second voltage signal processing circuit and positive and negative signal terminals; The positive and negative signal terminals are respectively connected to the two ends of the DC capacitor; the second voltage signal processing circuit is connected to the positive and negative signal terminals, and is used to amplify and filter the voltage signals transmitted by the positive and negative signal terminals, and send the processed voltage signals to the main control chip.

4. The capacitance monitoring device according to claim 1, wherein: The current sampling unit includes a plurality of current transformers; each current transformer is connected to the main control chip respectively.

5. The capacitance monitoring device according to claim 4, characterized in that: The capacitance monitoring device further includes a current signal processing unit; The current signal processing unit is connected to the main control chip and the current transformer respectively, and is used to obtain the current signal sent by the current transformer, and amplify and filter the current signal before sending it to the main control chip.

6. The capacitance monitoring device according to claim 1, characterized in that: The capacitance monitoring device includes a display screen; The display screen is connected to the main control chip and is used to display the voltage signal, the current signal and the capacitance parameter.

7. The capacitance monitoring device according to claim 1, wherein: The capacitance monitoring device includes a power conversion module; The input end of the power conversion module is connected to an external power supply, and the output end of the power conversion module is respectively connected to the main control chip, the current sampling unit, the AC voltage sampling unit and the DC voltage sampling unit, for supplying power to the main control chip, the current sampling unit, the AC voltage sampling unit and the DC voltage sampling unit.

8. The capacitance monitoring device according to any one of claims 1 to 7, characterized in that: The capacitance monitoring device also includes a CAN communication interface and an RS485 communication interface; the CAN communication interface and the RS485 communication interface are respectively connected to the main control chip; the main control chip establishes a communication connection with an external device through the CAN communication interface or the RS485 communication interface.

9. The capacitance monitoring device according to any one of claims 1 to 7, characterized in that: The capacitance monitoring device also includes a fault indicator light; The fault indicator light is connected to the main control chip, and the main control chip is used to control the display state of the fault indicator light.

10. The capacitance monitoring device according to any one of claims 1 to 7, characterized in that: The capacitance monitoring device further includes a device housing; the current sampling unit, the AC voltage sampling unit, the DC voltage sampling unit and the main control chip are all placed in the device housing.

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