CN113640569A

CN113640569A - Voltage detection device

Info

Publication number: CN113640569A
Application number: CN202110757814.XA
Authority: CN
Inventors: 卞雷祥; 黄子军
Original assignee: Nanjing University of Science and Technology
Current assignee: Nanjing University of Science and Technology
Priority date: 2021-07-05
Filing date: 2021-07-05
Publication date: 2021-11-12
Anticipated expiration: 2041-07-05
Also published as: CN113640569B

Abstract

The application provides a voltage detection device, relates to the electromechanical technical field, solves present voltage detection mode well high voltage side and low-voltage side do not have electricity to keep apart, has the problem of great potential safety hazard. In the voltage detection device, a first end of a first piezoelectric column is fixedly connected with an insulating frame, a first end of a first elastic cantilever beam is fixedly connected with the insulating frame, and a second end of the first piezoelectric column is fixedly connected with a second end of the first elastic cantilever beam; the first deformation detection module is fixedly connected with the first elastic cantilever beam and used for detecting the deformation of the first elastic cantilever beam and outputting a corresponding electric signal; the signal processing module is connected with the first deformation detection module and used for processing the electric signal output by the first deformation detection module to obtain a voltage value. The application provides a voltage detection device is used for detecting voltage.

Description

Voltage detection device

Technical Field

The application relates to the technical field of electromechanics, in particular to a voltage detection device.

Background

The voltage detection mode based on the resistance voltage division principle or the capacitance voltage division principle is a common mode for detecting high voltage at present.

However, in the voltage detection circuit obtained by the voltage detection method, the high voltage side and the low voltage side are not electrically isolated, and thus a large potential safety hazard exists.

Disclosure of Invention

The application provides a voltage detection device, can be used for solving present voltage detection mode well high voltage side and low-voltage side do not have electricity and keep apart, have the technical problem of great potential safety hazard.

The embodiment of the application provides a voltage detection device, which comprises a first piezoelectric column, a first elastic cantilever beam, an insulating frame, a first deformation detection module and a signal processing module;

wherein the first piezoelectric beam has a first end and a second end and the first resilient cantilever beam has a first end and a second end;

the first end of the first piezoelectric column is fixedly connected with the insulating frame, the first end of the first elastic cantilever beam is fixedly connected with the insulating frame, and the second end of the first piezoelectric column is fixedly connected with the second end of the first elastic cantilever beam;

the first deformation detection module is fixedly connected with the first elastic cantilever beam and is used for detecting the deformation of the first elastic cantilever beam and outputting a corresponding electric signal;

the signal processing module is connected with the first deformation detection module and used for processing the electric signal output by the first deformation detection module to obtain a voltage value.

Optionally, in one embodiment, the first deformation detection module comprises a deformation responsive element and a support member;

the deformation response element is fixedly connected with the supporting part, the supporting part is fixedly connected with the first elastic cantilever beam, and the deformation response element deforms along with the deformation of the first elastic cantilever beam.

Optionally, in one embodiment, the deformation responsive element comprises a resistive strain gauge or a tuning fork resonator.

Optionally, in one embodiment, the first deformation detecting module includes a first deformation detecting unit and a second deformation detecting unit, and the first elastic cantilever beam has a first surface and a second surface opposite to each other;

the first surface of the first elastic cantilever beam is connected with the first end of the first elastic cantilever beam and the second end of the first elastic cantilever beam; the second surface of the first elastic cantilever beam is connected with the first end of the first elastic cantilever beam and the second end of the first elastic cantilever beam;

the first deformation detection unit is fixedly connected with the first surface of the first elastic cantilever beam, and the second deformation detection unit is fixedly connected with the second surface of the first elastic cantilever beam.

Optionally, in an embodiment, the voltage detection device further includes a metal shielding case;

the first deformation detection module is arranged inside the metal shielding shell, the first piezoelectric column is arranged outside the metal shielding shell, and the metal shielding shell is grounded.

Optionally, in an embodiment, the voltage detection device further comprises a first metal pre-tightening spring;

and the first end of the first piezoelectric column is fixedly connected with the insulating frame through the first metal pre-tightening spring.

Optionally, in an embodiment, the voltage detection apparatus further includes a second piezoelectric column;

the second piezoelectric column is provided with a first end and a second end, the first end of the second piezoelectric column is fixedly connected with the insulating frame, and the second end of the second piezoelectric column is fixedly connected with the second end of the first elastic cantilever beam;

the first end of the second voltage column and the first end of the first voltage column are both positive electrodes, and the second end of the second voltage column and the second end of the first voltage column are both negative electrodes; or the first end of the second voltage column and the first end of the first voltage column are both negative electrodes, and the second end of the second voltage column and the second end of the first voltage column are both positive electrodes.

Optionally, in one embodiment, the voltage detection device comprises a first metal pre-loaded spring and a second metal pre-loaded spring;

the first end of the first piezoelectric column is fixedly connected with the insulating frame through the first metal pre-tightening spring; and the first end of the second piezoelectric column is fixedly connected with the insulating frame through the second metal pre-tightening spring.

Optionally, in an embodiment, the voltage detection apparatus further includes a second elastic cantilever beam and a second deformation detection module;

the second elastic cantilever beam has a first end and a second end;

the first end of the second elastic cantilever beam is fixedly connected with the insulating frame, and the second end of the first piezoelectric column is fixedly connected with the second end of the second elastic cantilever beam;

the second deformation detection module is fixedly connected with the second elastic cantilever beam and is used for detecting the deformation of the second elastic cantilever beam and outputting a corresponding electric signal;

the signal processing module is connected with the first deformation detection module and the second deformation detection module and used for processing the electric signal output by the first deformation detection module and the electric signal output by the second deformation detection module to obtain a voltage value.

Optionally, in one embodiment, the voltage detection device further comprises a first stress release spring and a second stress release spring;

the first end of the first elastic cantilever beam is fixedly connected with the insulating frame through the first stress release spring; and the first end of the second elastic cantilever beam is fixedly connected with the insulating frame through the second stress release spring.

The beneficial effect that this application brought is as follows:

by adopting the voltage detection device provided by the embodiment of the application, the voltage detection device comprises a first piezoelectric column, a first elastic cantilever beam, an insulating frame, a first deformation detection module and a signal processing module; wherein the first piezoelectric beam has a first end and a second end and the first resilient cantilever beam has a first end and a second end; the first end of the first piezoelectric column is fixedly connected with the insulating frame, the first end of the first elastic cantilever beam is fixedly connected with the insulating frame, and the second end of the first piezoelectric column is fixedly connected with the second end of the first elastic cantilever beam; the first deformation detection module is fixedly connected with the first elastic cantilever beam and is used for detecting the deformation of the first elastic cantilever beam and outputting a corresponding electric signal; the signal processing module is connected with the first deformation detection module and is used for processing the electric signal output by the first deformation detection module to obtain a voltage value; when a voltage to be detected is applied to the first piezoelectric column, the first piezoelectric column deforms to drive the second end of the first elastic cantilever beam to move, so that elastic bending deformation of the first elastic cantilever beam is caused, the first deformation detection module can detect deformation of the first elastic cantilever beam and output a corresponding electric signal, and the signal processing module can process the electric signal to obtain a voltage value to be detected. Therefore, through the voltage detection device provided by the embodiment of the application, no electrical connection exists between the high-voltage side (the first piezoelectric column) and the weak-voltage side (the first deformation detection module and the signal processing module), the isolation between the high-voltage side and the weak-voltage side is realized, and the potential safety hazard is effectively reduced.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts. In the drawings:

FIG. 1 is a schematic diagram of a voltage detection circuit in the prior art;

fig. 2 is a schematic structural diagram of a voltage detection apparatus according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a piezoelectric column in a voltage detection apparatus according to an embodiment of the present disclosure;

fig. 4 is a schematic diagram illustrating an operating state of a voltage detection apparatus according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of another voltage detection apparatus according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a deformation detection module in a voltage detection apparatus according to an embodiment of the present disclosure;

FIGS. 7-1 and 7-2 are schematic structural diagrams of still another voltage detection apparatus provided in an embodiment of the present application;

fig. 8 is a schematic structural diagram of another voltage detection apparatus according to an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of another voltage detection apparatus according to an embodiment of the present disclosure;

fig. 10 is a schematic structural diagram of a deformation detection module in a voltage detection apparatus according to an embodiment of the present disclosure;

fig. 11 is a schematic structural diagram of a deformation detection module in a voltage detection apparatus according to an embodiment of the present disclosure;

fig. 12 is a schematic structural diagram of a deformation detection module in a voltage detection apparatus according to an embodiment of the present disclosure;

fig. 13 is a schematic structural diagram of another voltage detection apparatus according to an embodiment of the present disclosure;

fig. 14 is a schematic structural diagram of another voltage detection apparatus according to an embodiment of the present disclosure;

fig. 15 is a schematic structural diagram of another voltage detection apparatus according to an embodiment of the present disclosure;

fig. 16 is a schematic structural diagram of another voltage detection apparatus according to an embodiment of the present disclosure;

fig. 17 is a schematic structural diagram of another voltage detection apparatus according to an embodiment of the present application;

fig. 18 is a schematic structural diagram of a deformation detection module in a voltage detection apparatus according to an embodiment of the present disclosure;

FIG. 19 is a linear plot of the differential frequency between the input voltage and the output voltage measured according to the embodiment of the present application;

fig. 20-1 and 20-2 are schematic structural diagrams of a deformation detection module in a voltage detection apparatus according to an embodiment of the present disclosure;

FIG. 21 is a schematic diagram of a Wheatstone bridge circuit configuration;

fig. 22 is a schematic structural diagram of another voltage detection apparatus according to an embodiment of the present application.

Reference numerals:

10-voltage detection means; 101-a first piezoelectric column; 1011-positive electrode; 1012-negative pole; 1013-columns; 102 — a first elastic cantilever beam; 1021 — a first surface; 1022 — a second surface; 103-rim frame; 104 — a first deformation detection module; 1041 — a deformation responsive element; 1042 — a signal output unit; 1043 — a support member; 10431 — an elastic support plate; 105-a metallic shielding shell; 106-a first metal pre-tightening spring; 107-a second piezoelectric column; 108-a second metal pre-tightening spring; 109-a second elastic cantilever beam; 110 — a second deformation detection module; 111 — first stress relief spring; 112 — a second stress relief spring.

20-voltage detection means; 201 — a first piezoelectric column; 202-a second piezoelectric column; 203-a first metal pre-tightening spring; 204-a second metal pre-tightening spring; 205 — a first resilient cantilever beam; 206-an insulating frame; 207 — a first deformation detection module; 2071 — deformation responsive element; 2072 — signal output unit; 2073 — a support part; 208 — metallic shielding shell.

30-voltage detection means; 301 — a first piezoelectric column; 302-a second piezoelectric column; 303-a first metal pre-tightening spring; 304-a second metal pre-tension spring; 305 — a first resilient cantilever beam; 306 — a second resilient cantilever; 307 — a first stress relief spring; 308-a second stress relief spring; 309-insulating frame; 310 — a first deformation detection module; 311 — second deformation detecting element; 312 — a first metallic shielding shell; 313 — a second metallic shielding shell.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail and completely with reference to the following specific embodiments of the present application and the accompanying drawings. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The features of the terms first and second in the description and in the claims of the present application may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality" means two or more unless otherwise specified. In addition, "and/or" in the specification and claims means at least one of connected objects, a character "/" generally means that a preceding and succeeding related objects are in an "or" relationship.

In the description of the present application, it is to be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and are therefore not to be considered limiting of the present application.

In the description of the present application, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

As described in the background of the present application, in the voltage detection circuit based on the resistance voltage division principle or the capacitance voltage division principle, the high voltage side and the low voltage side are not electrically isolated, and there is a large potential safety hazard. Fig. 1 shows a voltage detection circuit based on the principle of resistance voltage division in the prior art, which is mainly used for detecting high voltage, and the circuit includes a resistor R1 and a resistor R2, and further includes a voltage input terminal Ui and a voltage output terminal Uo, and the resistor R1 is connected in series with the resistor R2; the input voltage Ui is applied to the resistor R1 and the resistor R2, the output voltage Uo is the voltage of the resistor R2, and the value of the input voltage Ui to be measured can be obtained based on the voltage Uo of the resistor R2 and the resistance ratio of the resistor R1 to the resistor R2. It can be seen that, in the voltage detection circuit, the high voltage side (voltage input end) and the low voltage side (voltage output end) are electrically connected without isolation, so that the high voltage side may affect the low voltage side, for example, high voltage breakdown occurs, and the low voltage side is inaccurate in detection, and thus, a great potential safety hazard exists.

In view of this, the embodiment of the present application provides a voltage detection device 10, which is used to solve the technical problem that there is a large potential safety hazard because there is no isolation between the high voltage side and the low voltage side in the voltage detection circuit. As shown in fig. 2, the voltage detection apparatus 10 includes a first piezoelectric pillar 101, a first elastic cantilever 102, an insulating frame 103, a first deformation detection module 104, and a signal processing module; the first piezoelectric beam 101 has a first end and a second end, and the first elastic cantilever beam 102 has a first end and a second end; a first end of the first piezoelectric pillar 101 is fixedly connected with the insulating frame 103, a first end of the first elastic cantilever beam 102 is fixedly connected with the insulating frame 103, and a second end of the first piezoelectric pillar 101 is fixedly connected with a second end of the first elastic cantilever beam 102; the first deformation detection module 104 is fixedly connected to the first elastic cantilever 102, and is configured to detect deformation of the first elastic cantilever 102 and output a corresponding electrical signal; the signal processing module is connected to the first deformation detection module 104, and is configured to process the electrical signal output by the first deformation detection module 104 to obtain a voltage value.

Wherein the first piezoelectric column 101 can be deformed under the application of a voltage to be measured. As shown in fig. 3, the first piezoelectric column 101 includes a positive pole 1011, a negative pole 1012, and a column 1013 connecting the positive pole 1011 and the negative pole 1012, wherein the positive pole 1011 is used for inputting a voltage to be measured, and the negative pole 1012 is used for grounding. The cylinder 1013 is made of a piezoelectric material, so that the first piezoelectric cylinder 101 can deform based on the inverse voltage effect when a voltage to be measured is applied, and the deformation can be elongation or compression, which can be determined according to the performance of the piezoelectric material. For the characteristics of greater sensitivity and capability of withstanding higher input voltage, the piezoelectric material may be selected from piezoelectric materials with high impedance and high piezoelectric constant, such as lead zirconate titanate piezoelectric ceramic (PZT), lead magnesium niobate titanate piezoelectric ceramic (PMN-PT), and the like. When a voltage to be measured is applied to the first piezoelectric pillar 101, the pillar 1013 deforms in the polarization direction, and the first piezoelectric pillar 101 undergoes an elongation or compression deformation. The positive electrode 1011 and the negative electrode 1012 of the first piezoelectric pillar 101 may be distributed such that the first end of the first piezoelectric pillar 101 is a positive electrode and the second end of the first piezoelectric pillar 101 is a negative electrode, or the first end of the first piezoelectric pillar 101 is a negative electrode and the second end of the first piezoelectric pillar 101 is a positive electrode.

First resilient cantilever beam 102 is made of a resilient material that is resiliently yieldably deformable upon application of an external force. The second end of first resilient cantilever beam 102 is a free end, and deflection of the free end may cause first resilient cantilever beam 102 to bend. The second end of the first elastic cantilever beam 102 is fixedly connected to the second end of the first piezoelectric beam 101, so that deformation of the first piezoelectric beam 101 may cause movement of the second end of the first elastic cantilever beam 102, thereby causing bending of the first elastic cantilever beam 102, as shown in fig. 4, after a voltage to be measured is input to the first piezoelectric beam 101, the first elastic cantilever beam 102 is subjected to elongation deformation, thereby causing downward bending of the first elastic cantilever beam 102; it will also be understood that the longitudinal stress/strain of first piezoelectric pillar 101 is converted into the bending stress/strain of first elastic cantilever beam 102, but of course, the bending direction of first elastic cantilever beam 102 may also be upward when piezoelectric pillar 101 is compressively deformed. In order to avoid the influence of the high voltage side (the first piezoelectric pillar 101) on the low voltage side (the first deformation detecting module 104 and the signal processing module) as much as possible, the first elastic cantilever 102 is preferably made of an insulating elastic material, such as a ceramic material with good insulating property and mechanical property, for example, alumina ceramic, zirconia ceramic, etc. In addition, in order to avoid the voltage misdetection caused by the miscontact of the free end of the first elastic cantilever 102 when the voltage to be measured is applied to the first piezoelectric column 101, in a preferred embodiment, the first end of the first piezoelectric column 101 is a positive electrode, and the second end of the first piezoelectric column 101 is a negative electrode; that is, one end of the first piezoelectric pillar 101 fixedly connected to the free end of the first elastic cantilever 102 is a negative electrode and is grounded, as shown in fig. 5.

In practical applications, in order to increase the elastic bending deformation of the first elastic cantilever 102 in response to the deformation of the first piezoelectric pillar 101, and to improve the sensitivity of the voltage detection apparatus 10, it is preferable that the first piezoelectric pillar 101 is perpendicular to the first elastic cantilever 102, as shown in fig. 2. In this case, the first piezoelectric column 101 is deformed in the longitudinal direction, i.e., in the direction perpendicular to the first elastic cantilever 102, so that a large degree of bending deformation of the first elastic cantilever 102 may be caused.

Insulating frame 103 may be used to secure first piezoelectric pillar 101 and first elastic cantilever beam 102 such that deformation of first piezoelectric pillar 101 may transfer a corresponding stress/strain to first elastic cantilever beam 102, resulting in elastic bending deformation of first elastic cantilever beam 102. The insulating frame 103 is made of insulating materials, so that the influence of a high-voltage side on a low-voltage side can be reduced as much as possible, such as alumina ceramics, magnesia ceramics, zirconia ceramics and the like with good insulating performance and machining performance; the mechanical strength can be ensured while the insulation safety performance of the whole structure of the voltage detection device 10 is ensured. For the convenience of installation, the insulating frame 3 may be provided with mounting holes. The shape of the insulating frame 103 in fig. 2 is only an example, and the specific shape of the insulating frame 103 may be designed according to actual needs, and is not described herein again.

The first deformation detecting module 104 may be configured to detect an elastic bending deformation of the first elastic cantilever beam 102 and output a corresponding signal. In order to allow the first deformation detecting module 104 to detect the elastic bending deformation of the first elastic cantilever beam 102, preferably, the first elastic cantilever beam 102 has a first surface and a second surface opposite to each other, the first surface of the first elastic cantilever beam 102 is connected to the first end of the first elastic cantilever beam and the second end of the first elastic cantilever beam, the second surface of the first elastic cantilever beam 102 is connected to the first end of the first elastic cantilever beam 102 and the second end of the first elastic cantilever beam 102, and the first deformation detecting module 104 is fixedly connected to the first surface or the second surface of the first elastic cantilever beam 102.

Since the deformation may be reflected in a specific change in the appearance of the object, but also in a change in the stress and/or strain of the object; therefore, the first deformation detecting module 104 may be a detecting module for detecting a specific change in appearance of the first elastic cantilever beam 102, or may be a detecting module for detecting stress and/or strain of the first elastic cantilever beam 102. For accurate detection and simple detection, the first deformation detecting module 104 is preferably a detecting module for detecting the stress and/or strain of the first elastic cantilever 102. Then, the first deformation detecting module 104 may further include deformation responsive elements 1041 and a signal output unit 1042, the number of the deformation responsive elements 1041 is at least one; in practical applications, the number of deformation responsive elements 1041 may be multiple in order to improve detection accuracy. As shown in fig. 6, the deformation response element 1041 is connected to the signal output unit 1042, the signal output unit 1042 may be a sensing circuit, the deformation response element 1041 may be directly attached to the first elastic cantilever 102, and the specific type of the sensing circuit may be set according to the type of the deformation response element 1041. The deformation response element 1041 may deform in response to the deformation of the first elastic cantilever beam 102, and the signal output unit 1042 may detect the related information generated by the deformation response element and output a corresponding signal. For example, the deformation response element 1042 may be a tuning fork resonator (specifically, a tuning fork resonator with a high Q value), and the signal output unit 1042 may be a gate oscillation circuit (a kind of sensing circuit); both ends of the tuning fork resonator are fixed on the first elastic cantilever beam 102, the elastic bending deformation of the first elastic cantilever beam 102 causes a change in stress and/or strain, the tuning fork resonator is pulled up or compressed, and thus the resonant frequency of the tuning fork resonator changes, and the gate oscillation circuit can detect the resonant frequency of the tuning fork resonator and output a signal related to the resonant frequency as a signal output by the first deformation detection module 104.

The signal processing module may be configured to process the signal output by the first deformation detecting module 104 to obtain a voltage value to be measured applied to the first piezoelectric pillar 101. The signal processing module may be different according to the output signal of the first deformation detecting module 104. For example, when the output signal of the first deformation detecting module 104 is a signal related to the resonance frequency, the signal processing module may be a processing module that converts the resonance frequency related information into a voltage value. The signal processing module, which is not shown in the figure, may be electrically connected to the first deformation detecting module 104.

It can be understood that, with the voltage detection apparatus 10 provided in this embodiment of the present application, when a voltage to be detected is applied to the first piezoelectric pillar 101, the first piezoelectric pillar 101 deforms, and drives the second end of the first elastic cantilever 102 to move, so as to cause the elastic bending deformation of the first elastic cantilever 102, the first deformation detection module 104 can detect the deformation of the first elastic cantilever 102 and output a corresponding signal, and the signal processing module can process the signal to obtain a voltage value to be detected. As can be seen, in the voltage detection apparatus 10 according to the embodiment of the present application, there is no electrical connection between the high voltage side and the weak voltage side, the electro-force conversion that is "the deformation of the first piezoelectric column — the deformation of the first elastic cantilever beam" occurs, the change of the electrical physical quantity is converted into the change of the mechanical physical quantity, and the coupling between the high voltage side and the low voltage side is realized through the stress/strain longitudinal-bending conversion mechanical structure (mainly composed of the first piezoelectric column 10 and the first elastic cantilever beam 102), so that the isolation between the high voltage side and the weak voltage side is realized, and the potential safety hazard can be effectively reduced.

On the other hand, in the voltage detection device 10 provided in the embodiment of the present application, the first piezoelectric column 101 is made of a piezoelectric material, and the piezoelectric material has the characteristics of small volume and sensitive high-voltage response, so that the volume of the voltage detection device 10 can be reduced, and the voltage detection device 10 is also more suitable for high-voltage detection. Meanwhile, the piezoelectric material has very high resistivity (for example, the resistivity of the piezoelectric ceramic PZT-8 can reach 10)¹⁰Omega m level), the input impedance is very high, and the power supply to be measured is hardly influenced and basically cannot be outputThe existing heating and other problems do not need additional heat dissipation devices, so that the equipment resources can be saved.

In order to further improve the isolation effect between the high voltage side and the weak voltage side, in one embodiment, the voltage detection device 10 provided in the embodiment of the present application further includes a metal shielding housing 105, as shown in fig. 7-1 and 7-2 (fig. 7-1 is a cross-sectional view of the metal shielding housing 105, and fig. 7-2 is a front view of the metal shielding housing 105), the first deformation detection module 104 is disposed inside the metal shielding housing 105, the first piezoelectric pillar 101 is disposed outside the metal shielding housing 105, and the metal shielding housing 105 is grounded. In fig. 7-2, the first deformation detecting module 104 and the first elastic cantilever beam 102 inside the metal shielding case 105 are indicated by dotted lines).

The signal processing module may determine whether to be disposed inside the metal shielding case 105 according to actual conditions. For example, if the signal processing module is a remote processing module, it may not be disposed inside the metal shielding case 105.

The outer surface of the metal shielding case 105 may be further covered with an insulating layer to prevent breakdown and discharge caused by high voltage creepage.

It can be understood that, by the above-mentioned scheme, the first deformation detection module 104 is disposed inside the metal shielding shell 105, so that the accuracy of the output signal of the first deformation detection module 104 can be ensured, and the output signal of the first deformation detection module 104 is prevented from being subjected to electromagnetic interference on the high voltage side.

In order to improve the performance of the first piezoelectric column 101, so that the first piezoelectric column 101 can be effectively deformed when a voltage to be measured is applied, in an embodiment, the voltage detection apparatus 10 provided in this embodiment of the present application further includes a first metal pre-tightening spring 106, as shown in fig. 8, a first end of the first piezoelectric column 101 is fixedly connected to the insulating frame 103 through the first metal pre-tightening spring 106.

The first metal pre-tightening spring 106 can provide pre-tightening force to the first piezoelectric column 101, so as to ensure the performance of the first piezoelectric column 101. The first end of the first piezoelectric column 101 is fixedly connected to the insulating frame 103 through the first metal pre-tightening spring 106, which can be understood as that the first metal pre-tightening spring 106 is fixedly connected to the insulating frame 103, and then the first end of the first piezoelectric column 101 is fixedly connected to the first metal pre-tightening spring 106, so that the first piezoelectric column 101 and the insulating frame 103 can be fixedly connected. The first metal pre-tensioned spring 106 can be used as a voltage input terminal to be measured.

It can be understood that, by the above-mentioned solution, the first metal pre-tightening spring 106 is disposed between the first piezoelectric pillar 101 and the insulating frame 103, so as to provide a pre-tightening force to the first piezoelectric pillar 101, thereby improving the performance of the first piezoelectric pillar 101, and enabling the first piezoelectric pillar 101 to deform effectively when a voltage to be measured is applied.

In practical applications, in order to further improve the sensitivity of the voltage detection apparatus 10, in an implementation manner, in the voltage detection apparatus 10 provided in the embodiment of the present application, as shown in fig. 9, the first deformation detecting module 104 further includes a supporting member 1043 on the basis of including the deformation response element 1041 and the signal output unit 1042; the deformation response element 1041 is fixedly connected to the support member 1043, the support member 1043 is fixedly connected to the first elastic cantilever beam 102, and the deformation response element 1041 deforms along with the deformation of the first elastic cantilever beam 102.

The structure of the support member 1043 may be set according to the type of the deformation responsive element 1041.

The deformation responsive element 1041 is fixedly connected to the support member 1043 and the support member 1043 is fixedly connected to the first resilient cantilever beam 102, i.e. the deformation responsive element 1041 and the first resilient cantilever beam 102 are indirectly connected through the support member 1043.

It will be appreciated that by providing the support member 1043 between the deformation responsive element 1041 and the first resilient cantilever beam 102 in the above arrangement, the deformation responsive element 1041 is offset from the neutral layer of the first resilient cantilever beam 102 by a certain distance, so that the stress and/or strain transmitted to the deformation responsive element 1041 by the first resilient cantilever beam 102 when bent can be amplified, and the sensitivity of the voltage detection apparatus 10 can be improved.

In the above embodiments, the deformation responsive element 1041 may comprise a resistive strain gage or a tuning fork resonator. Then, when the type of the deformation responsive element 1041 is different, the specific structure of the support member 1043 may also be different. For example, if the deformation responsive element 1041 is a resistive strain gage, then the support member 1043 comprises a resilient support plate 10431, as shown in fig. 10, the resilient support plate 10431 having a first side and a second side opposite to each other, the resistive strain gage being attached to the first side of the resilient support plate 10431, and the second side of the resilient support plate 10431 being fixedly connected to the first surface of the first resilient cantilever beam 102. Or for example, the deformation responsive element 1041 is a tuning fork resonator, then the support member 1043 comprises a first support column a and a second support column b, as shown in fig. 11, the first support column a has a first end and a second end, the second support column b has a first end and a second end, the tuning fork resonator comprises a first end and a second end, the first end of the tuning fork resonator is fixedly connected with the first end of the first support column a, the second end of the tuning fork resonator is fixedly connected with the first end of the second support column b, the second end of the first support column a is fixedly connected with the first surface of the first elastic cantilever beam 102, and the second end of the second support column b is fixedly connected with the first surface of the first elastic cantilever beam 102.

It is contemplated that external temperature variations may affect the deformation of the first resilient cantilever beam 102 and thus the accuracy of the voltage detection apparatus 10. Thus, in one embodiment, as shown in fig. 12, the first deformation detecting module 104 includes a first deformation detecting unit a fixedly connected to the first surface 1021 of the first elastic cantilever 102 and a second deformation detecting unit B fixedly connected to the second surface 1022 of the first elastic cantilever 102.

The first deformation detecting unit a may include at least one deformation responsive element 1041, and the second deformation detecting unit B may also include at least one deformation responsive element 1041. The deformation responsive element 1041 in the first deformation detecting unit a and the deformation responsive element 1041 in the second deformation detecting unit B may be connected to the same signal output unit 1042, or may be connected to different signal output units. Preferably, the number of the deformation responsive elements 1041 included in the first deformation detecting unit a is the same as the number of the deformation responsive elements 1041 included in the second deformation detecting unit B, and the arrangement manner and the arrangement position of the deformation responsive elements 1041 included in the first deformation detecting unit a are the same as the arrangement manner and the arrangement position of the deformation responsive elements 1041 included in the second deformation detecting unit B, that is, the deformation responsive elements in the first deformation detecting unit a and the deformation responsive elements in the second deformation detecting unit B are symmetrically arranged on the first elastic cantilever beam 102. For example, the first deformation detecting unit a includes two resistive strain gauges disposed in parallel on the first surface 1021 of the first elastic cantilever 102, and the second deformation detecting unit B also includes two resistive strain gauges disposed in parallel on the second surface 1022 of the first elastic cantilever 102, where the resistive strain gauge on the first surface 1021 and the resistive strain gauge on the second surface 1022 of the first elastic cantilever 102 are symmetrically disposed. Meanwhile, the two resistance strain gauges included in the first deformation detecting unit a and the two resistance strain gauges included in the second deformation detecting unit B may be connected to the same signal output unit 1042, and the signal output unit 1042 may be a wheatstone bridge circuit.

It can be understood that, if the deformation detection unit is disposed on only one of the first surface 1021 and the second surface 1022 of the first elastic cantilever 102, for example, the resistance strain gauge is disposed on only the first surface 1021 of the first elastic cantilever 102, the deformation of the first elastic cantilever 102 may include deformation caused by the first piezoelectric pillar 101 and temperature-induced deformation due to the ambient temperature, for example, the first elastic cantilever 102 is elongated to a certain extent due to high temperature, and the stress/strain received by the resistance strain gauge becomes larger, and the tensile deformation is larger, which results in inaccurate detection result of the voltage detection apparatus 10.

It can be understood that, by dividing the first deformation detecting module 104 into the first deformation detecting unit a and the second deformation detecting unit B, and fixedly connecting the first deformation detecting unit a to the first surface 1021 of the first elastic cantilever 102 and fixedly connecting the second deformation detecting unit B to the second surface 1022 of the first elastic cantilever 102, the first deformation detecting module 104 can operate in a differential mode, in which the deformation (e.g., the detected stress/strain) detected by the first deformation detecting unit a is subtracted from the deformation (e.g., the detected stress/strain) detected by the second deformation detecting unit B, and the twice deformation of the first elastic cantilever 102 caused by the first piezoelectric column 101 can be obtained, wherein the deformation caused by the temperature can be cancelled. For example, when deformation of first piezoelectric pillar 101 causes first surface 1021 of first elastic cantilever 102 to stretch by 1cm, and high temperature causes first surface 1021 of first elastic cantilever 102 to stretch by 0.5cm, then the amount of deformation stretch of first surface 1021 of first elastic cantilever 102 is (1+0.5) cm; meanwhile, the second surface 1022 of the first elastic cantilever beam 102 is compressed and stretched to-1 cm, and the high temperature causes the second surface 1022 to stretch by 0.5cm, so that the deformation stretch of the second surface is (-1+0.5) cm, and subtraction results in [ (1+0.5) - (-1+0.5) ], i.e. 2cm, which is just twice the deformation of the first elastic cantilever beam 102. Therefore, by the above arrangement, the first deformation detection module 104 works in the differential mode, so that the influence of the external environment temperature on the voltage detection device 10 can be reduced, and the temperature drift can be reduced, thereby improving the temperature stability and sensitivity of the voltage detection device 10.

In practical applications, the external temperature change may affect not only the deformation of the first elastic cantilever 102, but also the deformation of the first piezoelectric pillar 101, and thus the accuracy of the voltage detection apparatus 10. That is, under the influence of the ambient temperature, the deformation of the first piezoelectric pillar 101 may include deformation caused by inputting the voltage to be measured and deformation caused by temperature, for example, the first piezoelectric pillar 101 is elongated to some extent due to high temperature, and thus the elongation of the first piezoelectric pillar 101 is increased, the deformation of the first elastic cantilever 102 is also increased, the stress/strain applied to the resistance strain gauge is also increased, and the tensile deformation is also greater, so that the detection result of the voltage detection apparatus 10 is inaccurate. Therefore, in an implementation manner, the voltage detection apparatus 10 provided in this embodiment of the present application further includes a second piezoelectric pillar 107, as shown in fig. 13, where the second piezoelectric pillar 107 has a first end and a second end, the first end of the second piezoelectric pillar 107 is fixedly connected to the insulating frame 103, and the second end of the second piezoelectric pillar 107 is fixedly connected to the second end of the first elastic cantilever beam 102; a first end of the second voltage column 107 and a first end of the first voltage column 101 are both positive electrodes, and a second end of the second voltage column 107 and a second end of the first voltage column 101 are both negative electrodes; alternatively, the first end of the second voltage column 107 and the first end of the first voltage column 101 are both negative electrodes, and the second end of the second voltage column 107 and the second end of the first voltage column 101 are both positive electrodes.

The second piezoelectric column 107 and the first piezoelectric column 101 are symmetrically disposed on the first elastic cantilever 102 to form a "T-shaped" structure, as shown in fig. 13, the structure of the second piezoelectric column 107 can be referred to the first piezoelectric column 101, and is not described herein again.

At this time, the working process of the voltage detection device 10 may be as follows: as shown in fig. 13, voltages U1 and U2 to be measured are applied to the first voltage column 101 and the second voltage column 107, respectively, and due to the inverse piezoelectric effect, the first voltage column 101 and the second voltage column 107 will generate stress/strain along the polarization direction (longitudinal direction), and further generate deformation. When the two piezoelectric columns are subjected to a voltage U1< U2 or U1> U2, longitudinal stress/strain generated by the first voltage column 101 and the second voltage column 107 is transmitted to the first elastic cantilever beam 102, and the free end of the first elastic cantilever beam 102 is subjected to bending deformation towards the side where the piezoelectric column subjected to the smaller voltage is located, the deformation response element on one of the first surface 1021 and the second surface 1022 of the first elastic cantilever beam 102 is stretched, the deformation response element on the other surface is compressed, the first deformation detection module 104 operates in a differential mode, and a voltage difference between the voltages U1 and U2 to be detected, namely U1-U2, can be obtained by processing a signal output by the first deformation detection module 104. When the voltage U1 applied to the two piezoelectric columns is equal to U2, the stresses/strains generated in the longitudinal direction of the two piezoelectric columns cancel each other out, the first elastic cantilever beam 102 does not generate bending deformation, and the voltage difference between the voltages U1 and U2 to be measured is zero. Particularly, when the input voltage U1 or U2 is zero, the measured voltage value is the voltage of U2 or U1.

It can be understood that, according to the above-mentioned scheme, the ends of the first voltage column 101 and the second voltage column 107 connected to the first elastic cantilever 102 are both positive electrodes or both negative electrodes, so that the polarization directions of the first voltage column 101 and the second voltage column 107 are opposite, and if the polarization directions are both toward the first elastic cantilever 102, an inverse piezoelectric bimorph structure is further formed, which can counteract thermal strain generated by the first voltage column 101 and the second voltage column 107 due to temperature influence (the stress/strain generated by the first voltage column 101 and the second voltage column 107 due to temperature influence can counteract each other when being transferred to the cantilever), reduce the temperature drift of the voltage detection device 10, improve the temperature stability of the voltage detection device 10, and further improve the detection accuracy.

Accordingly, in one embodiment, the voltage detection device 10 provided by the embodiment of the present application may include a first metal pre-tightening spring 106 and a second metal pre-tightening spring 108; as shown in fig. 14, a first end of the first piezoelectric column 101 is fixedly connected to the insulating frame 103 through the first metal pre-tightening spring 106; and the first end of the second piezoelectric column 107 is fixedly connected with the insulating frame 103 through the second metal pre-tightening spring 108.

The function of the second metal pre-tightening spring 108 can be referred to as the first metal pre-tightening spring 106, and is not described herein again.

It can be understood that, by adopting the above-mentioned scheme, the first metal pre-tightening spring 106 is disposed between the first piezoelectric pillar 101 and the insulating frame 103, and the second pre-tightening spring 108 is disposed between the second piezoelectric pillar 107 and the insulating frame 103, so as to provide pre-tightening force to the first piezoelectric pillar 101 and the second piezoelectric pillar 107, and thus the performance of the first piezoelectric pillar 101 and the second piezoelectric pillar 107 can be improved, and the first piezoelectric pillar 101 and the second piezoelectric pillar 107 can be effectively deformed when a voltage to be measured is applied.

In practical applications, in order to prolong the service life of the voltage detection device 10, in one implementation, the voltage detection device 10 provided in the embodiment of the present application further includes a second elastic cantilever beam 109 and a second deformation detection module 110; as shown in fig. 15, the second resilient cantilever beam 109 has a first end and a second end; a first end of the second elastic cantilever beam 109 is fixedly connected with the insulating frame 103, and a second end of the first piezoelectric column 101 is fixedly connected with a second end of the second elastic cantilever beam 109; the second deformation detection module 110 is fixedly connected to the second elastic cantilever 109, and is configured to detect deformation of the second elastic cantilever 109 and output a corresponding electrical signal; the signal processing module is connected to the first deformation detection module 104 and the second deformation detection module 110, and is configured to process the electrical signal output by the first deformation detection module 104 and the electrical signal output by the second deformation detection module 110 to obtain a voltage value.

The second elastic cantilever 109 may be the same as the first elastic cantilever 102, and reference is specifically made to the description of the first elastic cantilever 102 in the above embodiments, which is not repeated herein. Similarly, the second deformation detecting module 110 may be the same as the first deformation detecting module 104, and reference is specifically made to the description of the first deformation detecting module 104 in the foregoing embodiment, which is not repeated herein. Preferably, the second elastic cantilever beam 109 is disposed symmetrically to the first elastic cantilever beam 102, and the second deformation detecting module 110 is disposed symmetrically to the first deformation detecting module 104.

It can be understood that, through the above-mentioned scheme, the design that uses two sets of deformation detection module can guarantee that under the condition that one set of deformation detection module damaged, another set of deformation detection module can also normally work to the voltage detection device 10 that this application embodiment provided also can normally work, has improved voltage detection device 10's life.

Accordingly, in one implementation, the voltage detection apparatus 10 provided in the embodiment of the present application may further include a first stress relief spring 111 and a second stress relief spring 112; as shown in fig. 16, a first end of the first elastic cantilever beam 102 is fixedly connected to the insulating frame 103 through the first stress releasing spring 111; and a first end of the second elastic cantilever beam 109 is fixedly connected with the insulating frame 103 through the second stress releasing spring 112.

Wherein the first stress relief spring 111 and the second stress relief spring 112 may help the first elastic cantilever beam 102 and the second elastic cantilever beam 109 relieve a portion of the stress/strain generated by the temperature influence. In addition, in order to avoid the influence of the high voltage side on the low voltage side as much as possible, the first stress relief spring 111 and the second stress relief spring 112 are preferably made of an insulating elastic material, such as a ceramic material, e.g., alumina, zirconia, etc., or other insulating material having good mechanical properties.

It can be understood that, by the above solution, the first stress relief spring 111 is disposed between the first elastic cantilever beam 102 and the insulating frame 103, and the second stress relief spring 112 is disposed between the second elastic cantilever beam 109 and the insulating frame 103, a part of the stress/strain generated by the two elastic cantilever beams due to thermal expansion and contraction under the influence of temperature can be relieved through the stress relief springs, and the other part can be mutually offset through the symmetry of the mechanical structure, so that the temperature drift of the voltage detection device 10 can be reduced, and the voltage detection device 10 has excellent stability in a wide temperature range.

The voltage detection device provided in the embodiments of the present application will be explained below with reference to specific embodiments, and it should be understood that the following embodiments are only examples and do not represent limitations of the voltage detection device provided in the embodiments of the present application.

Example one: as shown in fig. 17, a voltage detection device 20 includes a first piezoelectric pillar 201, a second piezoelectric pillar 202, a first metal pre-tightening spring 203, a second metal pre-tightening spring 204, a first elastic cantilever 205, an insulating frame 206, a first deformation detection module 207, a signal processing module, and a metal shielding housing 208.

The first end of the first piezoelectric column 201 is fixedly connected with the insulating frame 206 through a first metal pre-tightening spring 203, and the first end of the second piezoelectric column 202 is fixedly connected with the insulating frame 206 through a second metal pre-tightening spring 204; a first end of the first elastic cantilever beam 205 is fixedly connected with the insulating frame 206; the second end of the first piezoelectric column 201 is fixedly connected with the second end of the first elastic cantilever beam 205, and the second end of the second piezoelectric column 202 is fixedly connected with the second end of the first elastic cantilever beam 205; the first end of the second voltage column 202 and the first end of the first voltage column 201 are both positive poles, the second end of the second voltage column 202 and the second end of the first voltage column 201 are both negative poles, and the negative poles are grounded.

The first deformation detection module 207 includes a first deformation detection unit and a second deformation detection unit, the first deformation detection unit is fixedly connected with the first surface of the first elastic cantilever beam 205, and the second deformation detection unit is fixedly connected with the second surface of the first elastic cantilever beam 205. The signal processing module is connected to the first deformation detecting module 207.

The first deformation detection module 207 is disposed inside the metal shielding case 208, the first piezoelectric column 201 and the second piezoelectric column 202 are disposed outside the metal shielding case 208, and the metal shielding case 208 is grounded.

The first deformation detecting module 207 further includes a deformation responsive element 2071, a signal output unit 2072 and a support 2073.

In one embodiment, as shown in fig. 18, the deformation responsive element 2071 is a tuning fork resonator, which may be a quartz tuning fork resonator, the signal output unit 2072 is a gate oscillator circuit (within the dashed line), and the supporting part 2073 is similar to that in fig. 11, and will not be described herein again. The first deformation detecting unit and the second deformation detecting unit may respectively include a tuning fork resonator and a gate oscillator circuit, and the signal processing module 208 receives the signals output by the two gate oscillator circuits, processes and calculates the signals to obtain a voltage difference between the voltage U1 input on the first voltage column 201 and the voltage U2 input on the second voltage column 202.

In the case where the deformation response element 2071 is a tuning fork resonator, the operation process of the voltage detection apparatus 20 is specifically as follows: the first elastic cantilever beam 205 is bent and the stress/strain generated is transferred to the tuning fork resonator, and when the tuning fork resonator on one surface of the first elastic cantilever beam 205 is acted on by a tensile force, the resonance frequency is increased, and the tuning fork resonator on the other surface is acted on by a compressive force, so that the resonance frequency is decreased. By detecting the change of the resonant frequency of the tuning fork resonator, the voltage difference between the two input voltages U1 and U2 can be indirectly measured.

A gate oscillation circuit shown in fig. 18, which uses a Complementary Metal Oxide Semiconductor (CMOS) inverter as an active element, is composed of an amplifier and a feedback network in principle. The feedback resistor is used to ensure that the inverter operates in its linear region and can operate as an amplifier. When the closed loop gain is equal to or greater than 1 and the total phase shift of the amplifier and the feedback network is 0 or an integer multiple of 2 pi (360 degrees), the gate oscillation circuit outputs a digital frequency signal whose frequency depends on the resonant frequency of the tuning fork resonator. Particularly advantageously, the gate oscillator circuit requires only a power dissipation of the order of microwatts to excite the resonator into resonance. Alternatively, when the distortion response element 2071 is a tuning fork resonator, the signal output unit 2072 may also be a pierce oscillator, a colpitts oscillator, a crapp oscillator, or the like.

As shown in fig. 19, when the deformation response element 2071 is a tuning fork resonator, a sensitivity curve obtained by finite element software simulation is used, wherein the abscissa is a simulated input voltage and the ordinate is a simulated output tuning fork resonator differential resonance frequency; it can be seen from the simulation curve that there is a good linear relationship between the input voltage and the output differential frequency.

In another embodiment, the deformation responsive element 2071 is a resistance strain gauge, the signal output unit 2072 is a wheatstone bridge circuit, and the supporting part 2073 is similar to fig. 10, and will not be described again. The first deformation detecting unit includes two resistance strain gauges disposed in parallel on the first surface of the first elastic cantilever beam 205, and the second deformation detecting unit also includes two resistance strain gauges disposed in parallel on the second surface of the first elastic cantilever beam 205, where the resistance strain gauge on the first surface of the first elastic cantilever beam 205 and the resistance strain gauge on the second surface are disposed symmetrically. The voltage is measured indirectly by measuring the bending deformation of the first elastic cantilever beam 205 using a wheatstone bridge of 4 resistive strain gauges.

Preferably, the four resistive strain gages are connected in a full bridge fashion, with their bonding to the first resilient cantilever beam 205 being as shown in FIGS. 20-1 and 20-2, and the corresponding Wheatstone bridge circuit being as shown in FIG. 21. When the first elastic cantilever beam 205 is bent and deformed, the resistance strain gauges adhered to the upper and lower surfaces of the first elastic cantilever beam 205 are respectively subjected to tensile and compressive actions, the resistance values of the resistance strain gauges are correspondingly increased or decreased according to the tensile strain or compressive strain, so that the wheatstone bridge is out of balance, an electric signal is output, the strain magnitude generated by the resistance strain gauges can be obtained by measuring the signals output by the bridge, and the voltage difference between two input voltages U1 and U2 can be indirectly obtained.

In practical applications, 1/4 bridge or half bridge connection may be used, and accordingly, the adhesion of the resistance strain gauge to the first elastic cantilever beam 205 may be changed accordingly.

It can be understood that, with the voltage detection device 20 provided in the embodiment of the present application, there is no electrical connection between the high voltage side and the weak voltage side, what is happening is the electro-force conversion of "deformation of the high voltage-piezoelectric column — deformation of the elastic cantilever beam", which is to convert the change of the electrical physical quantity into the change of the mechanical physical quantity, and the coupling between the high voltage side and the low voltage side is realized through the stress/strain longitudinal-bending conversion mechanical structure, so that the isolation between the high voltage side and the weak voltage side is realized, and the potential safety hazard can be effectively reduced.

Second, a voltage detection device 30, as shown in fig. 22, includes a first piezoelectric column 301, a second piezoelectric column 302, a first metal pre-tightening spring 303, a second metal pre-tightening spring 304, a first elastic cantilever 305, a second elastic cantilever 306, a first stress release spring 307, a second stress release spring 308, an insulating frame 309, a first deformation detection module 310, a second deformation detection element 311, a signal processing module, a first metal shielding case 312, and a second metal shielding case 313.

The difference from the first example includes that two elastic cantilever beams are used in this example, and the first deformation detecting module 310 and the second deformation detecting element 311 are symmetrically arranged on the two elastic cantilever beams, and the two elastic cantilever beams and the two piezoelectric columns form a cross-shaped structure; the two elastic cantilever beams are respectively and fixedly connected with the insulating frame 309 through a first stress releasing spring 307 and a second stress releasing spring 308, and meanwhile, a first deformation detection module 310 and a second deformation detection element 311 are respectively arranged in a first metal shielding shell 312 and a second metal shielding shell 313. Specifically, the specific structure of the first deformation detecting module 310 may be the structure of fig. 18 or fig. 20 to 21 in the example one, and the specific structure of the second deformation detecting element 311 may be the structure of fig. 18 or fig. 20 to 21 in the example one. The descriptions of other components and the connection relationship between the components can be referred to the foregoing embodiments, and are not repeated herein.

The voltage detection device 30 having the cross-shaped structure in this example has various advantages of the voltage detection device 20 having the T-shaped structure in the first example, and has good symmetry in the mechanical structure design, a part of stress/strain generated by the two piezoelectric columns and the two elastic cantilever beams due to thermal expansion and contraction can be released by the metal pre-tightening spring and the stress release spring under the influence of temperature, and the other part can be mutually offset by the symmetry of the mechanical structure, so that the temperature drift of the voltage detection device 30 can be reduced, and the voltage detection device 30 has excellent stability in a wide temperature range.

Meanwhile, two elastic cantilever beams are used, and the first deformation detection module 310 and the second deformation detection element 311 are symmetrically arranged on the two elastic cantilever beams to respectively measure the deformation of the two cantilever beams, so that the measurement accuracy of the voltage detection device 30 can be improved by a multi-physical-quantity cross decoupling algorithm, a differential amplification common-mode rejection method and other methods.

It can be understood that, with the voltage detection device 30 provided in the embodiment of the present application, there is no electrical connection between the high voltage side and the weak voltage side, what is happening is the electro-force conversion of "deformation of the high voltage-piezoelectric column — deformation of the elastic cantilever beam", which is to convert the change of the electrical physical quantity into the change of the mechanical physical quantity, and the coupling between the high voltage side and the low voltage side is realized through the stress/strain longitudinal-bending conversion mechanical structure, so that the isolation between the high voltage side and the weak voltage side is realized, and the potential safety hazard can be effectively reduced.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.

Claims

1. A voltage detection device is characterized by comprising a first piezoelectric column, a first elastic cantilever beam, an insulating frame, a first deformation detection module and a signal processing module;

2. The voltage detection apparatus according to claim 1, wherein the first deformation detection module includes a deformation responsive element and a support member;

3. The voltage detection apparatus of claim 2, wherein the deformation responsive element comprises a resistive strain gauge or a tuning fork resonator.

4. The voltage detection device of claim 1, wherein the first deformation detection module comprises a first deformation detection unit and a second deformation detection unit, the first elastic cantilever beam having a first surface and a second surface opposite to each other;

5. The voltage detection device according to claim 1, further comprising a metal shield case;

6. The voltage detection device of claim 1, further comprising a first metal pre-loaded spring;

7. The voltage detection device according to any one of claims 1 to 6, wherein the voltage detection device further comprises a second piezoelectric column;

8. The voltage detection device of claim 7, wherein the voltage detection device comprises a first metal pre-loaded spring and a second metal pre-loaded spring;

9. The voltage detection device of claim 1, further comprising a second elastic cantilever beam and a second deformation detection module;

the second elastic cantilever beam has a first end and a second end;

10. The voltage detection device according to claim 9, further comprising a first stress relief spring and a second stress relief spring;