CN216353803U - Capacitor assembly - Google Patents
Capacitor assembly Download PDFInfo
- Publication number
- CN216353803U CN216353803U CN202120776153.0U CN202120776153U CN216353803U CN 216353803 U CN216353803 U CN 216353803U CN 202120776153 U CN202120776153 U CN 202120776153U CN 216353803 U CN216353803 U CN 216353803U
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- CN
- China
- Prior art keywords
- pressure sensor
- capacitor
- housing
- sensor member
- pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
- H01G2/08—Cooling arrangements; Heating arrangements; Ventilating arrangements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
- H01G2/14—Protection against electric or thermal overload
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/08—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid operated electrically
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G2/00—Details of capacitors not covered by a single one of groups H01G4/00-H01G11/00
- H01G2/10—Housing; Encapsulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/224—Housing; Encapsulation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/38—Multiple capacitors, i.e. structural combinations of fixed capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/40—Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/0003—Protection against electric or thermal overload; cooling arrangements; means for avoiding the formation of cathode films
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/28—Structural combinations of electrolytic capacitors, rectifiers, detectors, switching devices with other electric components not covered by this subclass
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K5/00—Casings, cabinets or drawers for electric apparatus
- H05K5/06—Hermetically-sealed casings
- H05K5/069—Other details of the casing, e.g. wall structure, passage for a connector, a cable, a shaft
Abstract
A capacitor assembly, comprising: a housing (24); at least one capacitor (2) disposed within the housing (24), the at least one capacitor (2) comprising a first electrode, a second electrode, and a dielectric electrically insulating the first electrode from the second electrode; and a pressure sensor system comprising a pressure sensor member (4), the pressure sensor member (4) being adapted to generate an electrical signal in response to a predetermined pressure increase within the housing (24). The pressure sensor system comprises a pressure channel (6), the pressure channel (6) establishing a gas connection between the interior of the housing (24) and the pressure sensor member (4), and the pressure sensor member (4) being spaced apart from the housing (24).
Description
Technical Field
The present invention relates to a capacitor assembly.
Background
A malfunctioning film capacitor will typically cause a pressure rise within the housing of the film capacitor.
In one known capacitor assembly, there is a pressure sensor member attached to the capacitor housing and adapted to generate an electrical signal in response to a predetermined pressure rise within the capacitor housing, whereby the electrical signal is indicative of a fault condition of the capacitor.
A problem of the known capacitor assembly described above is that space is required for the pressure sensor components beside the capacitor housing. In addition, the pressure sensor component and its signal lines must generally be provided with additional insulation, so that the different potentials of the capacitor housing and the circuit board connected to the signal lines of the pressure sensor component do not cause problems.
SUMMERY OF THE UTILITY MODEL
It is an object of the present invention to develop a capacitor assembly by means of which the above-mentioned problems can be solved. The object of the utility model is achieved by a capacitor assembly as described below.
The present invention provides a capacitor assembly comprising: a housing; at least one capacitor disposed within the housing and comprising a first electrode, a second electrode, and a dielectric electrically insulating the first electrode from the second electrode; and a pressure sensor system comprising a pressure sensor member adapted to generate an electrical signal in response to a predetermined pressure increase within the housing, characterized in that the pressure sensor system comprises a pressure channel establishing a gaseous connection between the interior of the housing and the pressure sensor member, and the pressure sensor member is spaced apart from the housing.
The utility model is based on spacing the pressure sensor member from the respective capacitor and providing the capacitor assembly with a pressure channel forming a gas connection between the interior of the capacitor housing and the pressure sensor member.
An advantage of the capacitor assembly of the present invention is that there is no need to reserve space for the pressure sensor member at the side of the capacitor housing, but the pressure sensor member can be placed spaced apart from the capacitor. Furthermore, in case the pressure channel is made of an electrically insulating material, the pressure sensor member may be at any potential, which provides an even greater degree of freedom for positioning the pressure sensor member. In addition, no space needs to be left for the pressure sensor member within the capacitor housing, which means that the housing size can be reduced or, alternatively, the capacitance of the capacitor can be increased with the outer dimensions of the housing remaining unchanged. In an embodiment of the utility model, the pressure sensor member is connected to a circuit board and the capacitor is placed elsewhere.
Drawings
The utility model will now be described in connection with a preferred embodiment and with reference to fig. 1, which fig. 1 shows a capacitor assembly according to an embodiment of the utility model.
Detailed Description
Fig. 1 shows a capacitor assembly comprising a housing 24, six capacitors 2, a pressure sensor system, a circuit board 7 and a controller 8. Each capacitor 2 is disposed within the housing 24 and includes a first electrode, a second electrode, and a dielectric electrically insulating the first electrode from the second electrode. In fig. 1, the top wall of the housing 24 is omitted to show the capacitor 2 located within the housing 24.
The pressure sensor system comprises a pressure sensor member 4 and a pressure channel 6. The pressure sensor member 4 is spaced from the housing 24 and is adapted to generate an electrical signal in response to a predetermined pressure increase within the housing 24. The pressure channel 6 establishes a gas connection between the interior of the housing 24 and the pressure sensor member 4.
Each capacitor 2 is a film capacitor in which the dielectric between the first and second electrodes comprises polypropylene. In an alternative embodiment, at least one of the capacitors is a film capacitor whose dielectric comprises another plastic material. In another alternative embodiment, at least one of the capacitors is another type of capacitor than a film capacitor.
The pressure channel 6 is an airtight hose made of an electrically insulating material, which has sufficient heat resistance and vibration resistance. In an alternative embodiment, the pressure channel is a hard tube. The advantage of a flexible hose is that it can easily be shortened to a length suitable for each type of assembly. In addition, the flexible hose fits, even without being shortened, to a plurality of different assemblies in which the position of the pressure opening in the housing and the position of the pressure sensor member differ with respect to each other. An advantage of a stiff tube is its better ability to reliably transfer pressure changes from the housing to the pressure sensor member.
The pressure increase occurring inside the housing 24 in the event of a fault is caused by the temperature in the faulty capacitor 2 rising to over 300 c, at which point the polypropylene in the dielectric starts to disintegrate, which generates hydrocarbons. The formation of hydrocarbons increases the pressure within the housing 24 and this pressure increase is detectable by the pressure sensor member 4.
The housing 24 forms together with the pressure channel 6 and the pressure sensor member 4 a gas tight entity. Thus, the pressure detected by the pressure sensor member 4 is the same as the prevailing pressure within the housing 24. In addition, the gastight body ensures that the pressure sensor member 4 is also able to detect a situation in which hydrocarbons are formed relatively slowly within the housing 24.
In an alternative embodiment, the entity formed by the housing, the pressure channel and the pressure sensor member is not completely gas tight, but the sealing grade is selected such that the pressure sensor member is able to detect a sudden occurrence of a failure of at least one capacitor placed within the housing. When the capacitor suddenly fails, the pressure inside the housing rises rapidly, so that the pressure sensor member can detect a predetermined pressure increase before the pressure caused by the fault situation has had time to escape from the entity formed by the housing, the pressure channel and the pressure sensor member.
The controller 8 is communicatively connected to the pressure sensor member 4 and is adapted to switch off the voltage between the first and second electrodes of the at least one capacitor 2 in response to an electrical signal of the pressure sensor member 4. The predetermined pressure increase, for which the pressure sensor element 4 is adapted to react by generating an electrical signal, is selected to be sufficiently high that conventional variations in the load of the capacitor 2 and/or temperature or pressure fluctuations of the surroundings do not generate an electrical signal.
In an embodiment, the predetermined pressure increase within the housing comprises a predetermined pressure value to be exceeded. In an alternative embodiment, the predetermined pressure increase within the enclosure comprises a predetermined pressure difference between the interior of the enclosure and the space outside the enclosure. In another alternative embodiment, the predetermined pressure increase within the enclosure includes conditions such as the magnitude of the pressure within the enclosure and the rate of rise thereof.
The pressure sensor member 4 is connected to the circuit board 7 by soldering. The controller 8 is placed on a separate circuit board. The capacitor 2 is not connected to any circuit board. In an embodiment, the pressure sensor member is connected to the circuit board by a bonding means without soldering. In another alternative embodiment, the pressure sensor member and the controller are placed on the same circuit board.
In an alternative embodiment, each capacitor is placed in its own housing and each capacitor is monitored by a corresponding pressure sensor member. In this embodiment, a damaged capacitor may be detected and de-energized, and the capacitor in operation may be maintained energized.
In the embodiment of fig. 1, only the capacitor is placed within the housing 24. In alternative embodiments, other components of the type whose failure causes an increase in pressure within the enclosure are also placed in the enclosure. In this case, the predetermined pressure increase within the housing that causes the electrical signal to be generated is selected such that it is also able to detect a failure of the other component.
It is obvious to a person skilled in the art that the basic idea of the utility model can be implemented in many different ways. The utility model and its embodiments are thus not limited to the examples described above, but may vary within the scope of the claims.
Claims (6)
1. A capacitor assembly, comprising:
a housing (24);
at least one capacitor (2), the at least one capacitor (2) being disposed within the housing (24) and comprising a first electrode, a second electrode, and a dielectric electrically insulating the first electrode from the second electrode; and
a pressure sensor system comprising a pressure sensor member (4), the pressure sensor member (4) being adapted to generate an electrical signal in response to a predetermined pressure increase within the housing (24),
characterized in that the pressure sensor system comprises a pressure channel (6), the pressure channel (6) establishing a gaseous connection between the interior of the housing (24) and the pressure sensor member (4), and the pressure sensor member (4) being spaced apart from the housing (24).
2. The capacitor assembly according to claim 1, characterized in that the capacitor assembly comprises a controller (8), the controller (8) being communicatively connected to the pressure sensor member (4) and adapted to switch off the voltage between the first and second electrodes of the at least one capacitor (2) in response to an electrical signal from the pressure sensor member (4).
3. The capacitor assembly according to claim 1, characterized in that the pressure channel (6) is made of an electrically insulating material.
4. The capacitor assembly according to claim 1, characterized in that the housing (24) forms a gas-tight entity with the pressure channel (6) and the pressure sensor member (4).
5. The capacitor assembly according to claim 1, characterized in that the at least one capacitor (2) is a film capacitor.
6. The capacitor assembly according to claim 1, characterized in that the capacitor assembly comprises a circuit board (7), the pressure sensor member (4) being mounted on the circuit board (7).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FIU20204063U FI12694U1 (en) | 2020-04-15 | 2020-04-15 | Capacitor assembly |
| FIU20204063 | 2020-04-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216353803U true CN216353803U (en) | 2022-04-19 |
Family
ID=71526512
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120776153.0U Active CN216353803U (en) | 2020-04-15 | 2021-04-15 | Capacitor assembly |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN216353803U (en) |
| DE (1) | DE202021101656U1 (en) |
| FI (1) | FI12694U1 (en) |
-
2020
- 2020-04-15 FI FIU20204063U patent/FI12694U1/en active IP Right Grant
-
2021
- 2021-03-29 DE DE202021101656.6U patent/DE202021101656U1/en active Active
- 2021-04-15 CN CN202120776153.0U patent/CN216353803U/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| FI12694U1 (en) | 2020-07-15 |
| DE202021101656U1 (en) | 2021-04-08 |
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| GR01 | Patent grant |