CN219979307U - Leakage transformer and circuit breaker - Google Patents
Leakage transformer and circuit breaker Download PDFInfo
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- CN219979307U CN219979307U CN202321022834.3U CN202321022834U CN219979307U CN 219979307 U CN219979307 U CN 219979307U CN 202321022834 U CN202321022834 U CN 202321022834U CN 219979307 U CN219979307 U CN 219979307U
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- 229910052710 silicon Inorganic materials 0.000 claims description 11
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Abstract
The utility model relates to the technical field of power electronics, and discloses a leakage transformer and a circuit breaker, wherein the leakage transformer comprises: the zero sequence current transformer is connected with the power line at the input end and the filter circuit at the output end, and is used for monitoring whether zero sequence current exists in the power line or not; the output end of the filter circuit is connected with the input end of the control module and is used for filtering interference signals in zero sequence current signals in the circuit; the control module is used for processing the zero sequence current signal in the circuit and outputting a tripping signal; the zero sequence current transformer, the filter circuit and the control module are all arranged in the same shielding case and are sealed. The utility model utilizes the principle of separating strong current from weak current of the circuit board, encapsulates the weak current part of the circuit board into the shielding cover of the zero sequence current transformer, improves the anti-interference capability of the product and improves the creepage distance and dielectric property of external equipment.
Description
Technical Field
The utility model relates to the technical field of leakage protection, in particular to a leakage transformer and a circuit breaker.
Background
The zero sequence current transformer is usually in the form of adding a shielding case and plastic sealing glue, the circuit board is in the form of double-panel, and the anti-interference capability is improved by laying the ground on the back surface and the periphery of the chip in a large area while reducing the package of the board surface and components.
Because the circuit board adopts strong current and weak current integrated design, the board size needs to be larger under the restriction of dielectric property and creepage distance, the zero sequence current transformer is also larger, and the circuit board is closer to the main loop of the switch and needs to be additionally provided with a large amount of insulating materials for isolation, and the cost is higher while the potential safety hazard exists. Meanwhile, because the insulation material needs to be wrapped around the circuit board, when the circuit board operates in a high-temperature and high-humidity environment, condensation can be accumulated on the insulation material, and potential safety hazards exist on the circuit board.
Disclosure of Invention
Therefore, the utility model aims to solve the technical problem that the strong and weak currents of the leakage circuit board are designed together to cause weak anti-interference capability in the prior art, thereby providing the leakage transformer and the circuit breaker.
In order to achieve the above purpose, the present utility model provides the following technical solutions:
in a first aspect, the present utility model provides a leakage transformer comprising: the power circuit comprises a zero-sequence current transformer, a filter circuit and a control module, wherein the input end of the zero-sequence current transformer is connected with a power circuit, the output end of the zero-sequence current transformer is connected with the input end of the filter circuit and is used for monitoring whether zero-sequence current exists in the power circuit, and when zero-sequence current exists, a zero-sequence current signal is generated; the output end of the filter circuit is connected with the input end of the control module and is used for filtering interference signals in zero sequence current signals in the circuit; the control module is used for processing zero sequence current signals in the circuit and outputting tripping signals, and the tripping signals are used for controlling the external tripping module to trip; the zero sequence current transformer, the filter circuit and the control module are all arranged in the same shielding case and sealed.
The leakage transformer provided by the utility model utilizes the principle of separating strong current from weak current of the circuit board, and encapsulates the weak current part of the circuit board, namely the filter circuit and the control module, into the shielding case of the zero sequence current transformer after adopting small encapsulation devices and typesetting and designing again, thereby improving the anti-interference capability of the product, reducing the size of the circuit board and improving the creepage distance and dielectric property of external equipment.
In an alternative embodiment, the shielding cover is provided with a plurality of functional interfaces; the functional interface comprises: any one or a combination of a plurality of leakage value adjusting interfaces, power interfaces, ground interfaces, tripping output interfaces and test circuit interfaces.
The leakage transformer integrates the zero sequence current transformer and the weak current part into one part, and a plurality of functional interfaces are arranged on the part shielding cover, so that the utilization rate of the product space is improved, and in the design of other circuit breakers, only the connection relation between external equipment and the leakage transformer interface provided by the utility model is considered, and the weak current part is not required to be redesigned.
In an alternative embodiment, the filter circuit comprises: the circuit comprises a first resistor, a second resistor, a third resistor, a protection circuit, a first capacitor, a second capacitor and a third capacitor, wherein the first resistor, the first capacitor and the protection circuit are connected in parallel to form a first branch; the first end of the first branch is connected with the first output end of the zero sequence current transformer, the first end of the first branch is also connected with the first end of the second capacitor, the first end of the third capacitor and the first input end of the control module through the second resistor, the second end of the first branch is connected with the second output end of the zero sequence current transformer, and the second end of the first branch is also connected with the second end of the second capacitor and the second input end of the control module through the third resistor; and the second end of the second capacitor is grounded.
The filtering circuit is used for filtering interference signals in the zero-sequence current signals, and the protection circuit plays a role in protecting the control module and prevents the control module from being damaged due to overlarge zero-sequence current.
In an alternative embodiment, the control module includes: the control chip and the signal filter circuit, wherein the input end of the control chip is connected with the output end of the filter circuit and is used for carrying out data processing on the zero sequence current signal in the circuit and outputting a control signal; the input end of the signal filtering circuit is connected with the output end of the control chip and is used for filtering the interference signal in the control signal and then outputting a tripping signal.
The control chip is used for receiving the zero sequence current signals, comparing, amplifying and the like, filtering interference signals through the signal filtering circuit and outputting tripping signals, so that the noise is prevented from affecting the misoperation of the tripping module.
In a second aspect, the present utility model provides a circuit breaker including the leakage transformer of the first aspect or any one of the corresponding embodiments thereof, the circuit breaker including: the device comprises a first power supply module, a tripping module, a second power supply module, a driving module and a leakage transformer, wherein the input end of the first power supply module is connected with a power line and the power supply end of the leakage transformer, and the output end of the first power supply module is connected with the first end of the tripping module and is used for converting alternating current in the power line into direct current; the second end of the tripping module is connected with the input end of the second power supply module; the first output end and the second output end of the second power supply module are correspondingly connected with the two power supply ends of the driving module, the third output end of the second power supply module is connected with the power supply end of the leakage transformer, and the third output end of the second power supply module supplies power to the driving module and the leakage transformer after being powered from the tripping module; the input end of the driving module is connected with the output end of the leakage transformer and is used for sending a driving signal to the tripping module based on the tripping signal, and the driving signal is used for driving the tripping module to trip.
The circuit breaker provided by the utility model is applied to the leakage transformer of the first aspect or any corresponding implementation mode thereof, only the circuit design of the strong current parts such as the first power supply module, the tripping module, the second power supply module, the driving module and the like is considered, and the strong current parts are respectively connected with the interfaces of the leakage transformer, so that the strong and weak current separation design is realized, the anti-interference capability is improved, and meanwhile, the circuit design is simpler and more convenient.
In an alternative embodiment, the first power supply module includes: the surge pulse suppression circuit is connected with the power line at the input end and the rectifying circuit at the output end, and is used for suppressing peak high voltage; the output end of the rectifying circuit is connected with the first end of the tripping module and is used for converting alternating current into direct current.
In an alternative embodiment, the driving module includes: the input end of the switching circuit is connected with the second output end of the second power supply module and is used for providing a trigger signal for the silicon controlled rectifier circuit when the tripping module is not tripped; the first end of the controllable silicon circuit is connected with the first output end of the second power supply module, the second end of the controllable silicon circuit is connected with the output end of the switch circuit, and the third end of the controllable silicon circuit is connected with the output end of the leakage transformer and is used for outputting a driving signal after being in a conducting state based on a tripping signal and a triggering signal.
In an alternative embodiment, the circuit breaker further comprises a test circuit, the first and second ends of which are connected to the power line for simulating a leakage when it is closed.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
Fig. 1 is a composition diagram of a specific example of a leakage transformer according to an embodiment of the present utility model;
fig. 2 is a block diagram of a specific circuit of the leakage transformer according to an embodiment of the present utility model;
fig. 3 is a composition diagram of one specific example of a circuit breaker of an embodiment of the present utility model;
fig. 4 is a block diagram of a specific circuit of the circuit breaker according to the embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
The embodiment of the utility model provides a leakage transformer, which is characterized in that a weak current part of a circuit board of a leakage product such as a circuit breaker and a zero sequence current transformer are designed together, and the weak current part is packaged in a shielding case adding way, so that the space utilization rate of the zero sequence current transformer is improved, and the anti-interference capability of the weak current part is improved.
According to an embodiment of the present utility model, there is provided a leakage transformer, as shown in fig. 1, the leakage transformer 1 including: zero sequence current transformer 11, filter circuit 12 and control module 13.
As shown in fig. 1, an input end of a zero sequence current transformer 11 is connected with a power line, an output end of the zero sequence current transformer is connected with an input end of a filter circuit 12, and the zero sequence current transformer is used for monitoring whether zero sequence current exists in the power line, and when the zero sequence current exists, a zero sequence current signal is generated.
As shown in fig. 1, an output end of the filter circuit 12 is connected to an input end of the control module 13, and is used for filtering interference signals in the zero sequence current signals in the circuit.
As shown in fig. 1, the control module 13 is configured to process the zero sequence current signal in the circuit and output a trip signal, where the trip signal is used to control the trip module in the external device to trip.
As shown in fig. 1, the zero sequence current transformer 11, the filter circuit 12 and the control module 13 are all arranged in the same shielding case and sealed.
It should be noted that, the processing methods related to the control module in the present embodiment are all the processing methods of the zero sequence current signal of the circuit breaker in the prior art, and are not described herein again.
In some alternative embodiments, the shield is provided with a plurality of functional interfaces; the functional interface comprises: any one or a combination of a plurality of leakage value adjusting interfaces, power interfaces, ground interfaces, tripping output interfaces and test circuit interfaces.
It should be noted that the type, number and location of the functional interfaces on the shielding case may be designed according to the functional requirements of the actual product, which is not limited herein.
In some alternative embodiments, as shown in fig. 2, the filter circuit 12 includes: the first resistor R1, the second resistor R2, the third resistor R3, the protection circuit A1, the first capacitor C1, the second capacitor C2 and the third capacitor C3.
As shown in fig. 2, the first resistor R1, the first capacitor C1 and the protection circuit A1 are connected in parallel to form a first branch; the first end of the first branch is connected with the first output end of the zero sequence current transformer 11, the first end of the first branch is also connected with the first end of the second capacitor C2, the first end of the third capacitor C3 and the first input end of the control module 13 through the second resistor R2, the second end of the first branch is connected with the second output end of the zero sequence current transformer 11, and the second end of the first branch is also connected with the second end of the second capacitor C2 and the second input end of the control module 13 through the third resistor R3; and the second end of the second capacitor C2 is grounded.
In some alternative embodiments, as shown in fig. 2, the control module 13 includes: the control chip U1 and the signal filter circuit 131, wherein the input end of the control chip U1 is connected with the output end of the filter circuit 12 and is used for carrying out data processing on the zero sequence current signal in the circuit and outputting a control signal; the input end of the signal filter circuit 131 is connected to the output end of the control chip U1, and is configured to filter the interference signal in the control signal and output a trip signal.
It should be noted that, the signal filter circuit 131 is not limited to be composed of three capacitors, namely, the fourth capacitor C4, the fifth capacitor C5 and the sixth capacitor C6, and specific electrical components, numbers and connection relationships can be designed according to actual product requirements.
The embodiment of the utility model also provides a circuit breaker, which can realize the design of strong and weak current separation by connecting the strong current part of the circuit breaker with an interface on a shielding cover for packaging the leakage transformer, and improves the creepage distance and dielectric property of a circuit board of the strong current part of the circuit breaker and simultaneously ensures that the circuit design is simpler and more convenient.
According to an embodiment of the present utility model, there is provided a circuit breaker applied to the leakage transformer of the foregoing embodiment or any one of the corresponding embodiments, as shown in fig. 3, the circuit breaker includes: the device comprises a first power supply module 2, a tripping module 3, a second power supply module 4, a driving module 6 and a leakage transformer 1, wherein a three-phase four-wire system power line is taken as an example in fig. 3.
As shown in fig. 3, an input end of the first power supply module 2 is connected to a power line and a power supply end of the leakage transformer 1, and an output end of the first power supply module is connected to a first end of the trip module 3, so as to convert ac power in the power line into dc power.
As shown in fig. 3, the second end of the trip module 3 is connected with the input end of the second power supply module 4; the first output end and the second output end of the second power supply module 4 are correspondingly connected with two power supply ends of the driving module 5, the third output end of the second power supply module is connected with the power supply end of the leakage transformer 1, and the second power supply module supplies power for the driving module 5 and the leakage transformer 1 after taking energy from the tripping module 3.
As shown in fig. 3, an input end of the driving module 5 is connected with an output end of the leakage transformer 1, and is used for sending a driving signal to the tripping module 3 based on a tripping signal, wherein the driving signal is used for driving the tripping module 3 to trip.
Specifically, the varistor RV4 in the second power supply module 4 is used for filtering peak voltage in the circuit, the fourth resistor R4 plays a role in voltage division and current limiting, and after the filter capacitor C7 performs noise reduction treatment on the circuit, the second power supply module 4 supplies power to the control chip U1 through the fourth resistor R4.
In some alternative embodiments, as shown in fig. 4, the first power supply module 2 includes: the surge pulse suppression circuit 21 and the rectifying circuit 22, wherein the input end of the surge pulse suppression circuit 21 is connected with the power line, and the output end of the surge pulse suppression circuit 21 is connected with the input end of the rectifying circuit 22 and is used for suppressing peak high voltage; an output terminal of the rectifying circuit 22 is connected to a first terminal of the trip module 3 for converting the alternating current into direct current.
Optionally, the rectifying circuit in the embodiment of the present utility model is a three-phase bridge rectifying circuit, and the specific circuit structure is adjusted according to the type of the power line and the application scenario of the product, which is not limited herein.
In some alternative embodiments, as shown in fig. 4, the driving module 5 includes: a switching circuit 51 and a thyristor circuit 52.
As shown in fig. 4, an input terminal of the switching circuit 51 is connected to a second output terminal of the second power supply module 4, and is configured to provide a trigger signal to the thyristor circuit 52 when the trip module 3 is not tripped; the first end of the thyristor circuit 52 is connected to the first output end of the second power supply module 4, the second end thereof is connected to the output end of the switch circuit 51, and the third end thereof is connected to the output end of the leakage transformer 1, for outputting a driving signal after being in a conductive state based on a trip signal and a trigger signal.
Specifically, the switch circuit 51 includes a diode D13 and a fifth resistor R5, the thyristor circuit 52 includes a first thyristor SCR1 and a second thyristor SCR2, where an input end of the diode D13 is connected to a second output end of the second power supply module 4, an output end of the diode D is connected to a controlled end of the first thyristor SCR1 in the thyristor circuit 52 through the fifth resistor R5, an input end of the first thyristor SCR1 is connected to a first output end of the second power supply module 4, an output end of the first thyristor SCR1 is connected to an input end of the second thyristor SCR2, an output end of the second thyristor SCR2 is connected to an output end of the leakage transformer 1, and series connection of the first thyristor SCR1 and the second thyristor SCR2 can improve a voltage withstanding characteristic of the thyristor.
Specifically, the switch circuit 51 is configured to provide a trigger signal for the first SCR1, when the trip module 3 is not tripped, the first SCR1 is in a conductive state, and when the leakage transformer 1 outputs the trip signal, the controlled terminal of the second SCR2 receives the trip signal and is conductive; and when the first silicon controlled rectifier SCR1 and the second silicon controlled rectifier SCR2 are in a conducting state, a driving signal is output to drive the tripping module 3 to trip.
The switching circuit 51 and the thyristor circuit 52 are not limited to the electric elements provided in the above embodiment, and are not limited thereto.
In some alternative embodiments, as shown in fig. 4, the circuit breaker further includes a test circuit, both of which have a first end and a second end connected to the power line, for simulating a leakage when the switch K1 is closed.
It should be noted that, the operation method and principle of the test circuit in this embodiment are the method for simulating the leakage of the circuit breaker in the prior art, and are not described herein again.
Although embodiments of the present utility model have been described in connection with the accompanying drawings, various modifications and variations may be made by those skilled in the art without departing from the spirit and scope of the utility model, and such modifications and variations fall within the scope of the utility model as defined by the appended claims.
Claims (8)
1. A leakage transformer, comprising: the zero sequence current transformer, the filter circuit and the control module, wherein,
the input end of the zero-sequence current transformer is connected with the power line, the output end of the zero-sequence current transformer is connected with the input end of the filter circuit and is used for monitoring whether zero-sequence current exists in the power line, and when zero-sequence current exists, a zero-sequence current signal is generated;
the output end of the filter circuit is connected with the input end of the control module and is used for filtering interference signals in zero sequence current signals in the circuit;
the control module is used for processing the zero sequence current signal in the circuit and outputting a tripping signal, and the tripping signal is used for controlling the external tripping module to trip;
the zero sequence current transformer, the filter circuit and the control module are all arranged in the same shielding case and are sealed.
2. The leakage transformer according to claim 1, wherein,
a plurality of functional interfaces are arranged on the shielding cover;
the functional interface comprises: any one or a combination of a plurality of leakage value adjusting interfaces, power interfaces, ground interfaces, tripping output interfaces and test circuit interfaces.
3. The leakage transformer of claim 1, wherein the filter circuit comprises:
the first resistor, the second resistor, the third resistor, the protection circuit, the first capacitor, the second capacitor and the third capacitor, wherein,
the first resistor, the first capacitor and the protection circuit are connected in parallel to form a first branch;
the first end of the first branch is connected with the first output end of the zero sequence current transformer, the first end of the first branch is also connected with the first end of the second capacitor, the first end of the third capacitor and the first input end of the control module through the second resistor, the second end of the first branch is connected with the second output end of the zero sequence current transformer, and the second end of the second branch is also connected with the second end of the second capacitor and the second input end of the control module through the third resistor;
and the second end of the second capacitor is grounded.
4. The leakage transformer of claim 1, wherein the control module comprises: a control chip and a signal filter circuit, wherein,
the input end of the control chip is connected with the output end of the filter circuit and is used for carrying out data processing on the zero sequence current signal in the circuit and outputting a control signal;
and the input end of the signal filtering circuit is connected with the output end of the control chip and is used for filtering the interference signals in the control signals and then outputting trip signals.
5. A circuit breaker comprising the leakage transformer of any one of claims 1 to 4, the circuit breaker comprising: the first power supply module, the tripping module, the second power supply module, the driving module and the leakage transformer, wherein,
the input end of the first power supply module is connected with the power line and the power supply end of the leakage transformer, and the output end of the first power supply module is connected with the first end of the tripping module and is used for converting alternating current in the power line into direct current;
the second end of the tripping module is connected with the input end of the second power supply module;
the first output end and the second output end of the second power supply module are correspondingly connected with the two power supply ends of the driving module, the third output end of the second power supply module is connected with the power supply end of the leakage transformer, and the second power supply module supplies power for the driving module and the leakage transformer after taking energy from the tripping module;
and the input end of the driving module is connected with the output end of the leakage transformer and is used for sending a driving signal to the tripping module based on a tripping signal, and the driving signal is used for driving the tripping module to trip.
6. The circuit breaker of claim 5, wherein the first power module comprises: a surge pulse suppression circuit and a rectifying circuit, wherein,
the input end of the surge pulse suppression circuit is connected with the power line, and the output end of the surge pulse suppression circuit is connected with the input end of the rectification circuit and is used for suppressing peak high voltage;
and the output end of the rectifying circuit is connected with the first end of the tripping module and is used for converting alternating current into direct current.
7. The circuit breaker of claim 5, wherein the drive module comprises: a switch circuit and a silicon controlled rectifier circuit, wherein,
the input end of the switching circuit is connected with the second output end of the second power supply module, and the switching circuit is used for providing a trigger signal for the silicon controlled rectifier circuit when the tripping module is not tripped;
and the first end of the controllable silicon circuit is connected with the first output end of the second power supply module, the second end of the controllable silicon circuit is connected with the output end of the switch circuit, and the third end of the controllable silicon circuit is connected with the output end of the leakage transformer and is used for outputting a driving signal after being in a conducting state based on the tripping signal and the triggering signal.
8. The circuit breaker of claim 5, further comprising:
and the first end and the second end of the test circuit are connected with the power line and are used for simulating electric leakage when the test circuit is closed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321022834.3U CN219979307U (en) | 2023-04-28 | 2023-04-28 | Leakage transformer and circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321022834.3U CN219979307U (en) | 2023-04-28 | 2023-04-28 | Leakage transformer and circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219979307U true CN219979307U (en) | 2023-11-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
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| CN202321022834.3U Active CN219979307U (en) | 2023-04-28 | 2023-04-28 | Leakage transformer and circuit breaker |
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| CN (1) | CN219979307U (en) |
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- 2023-04-28 CN CN202321022834.3U patent/CN219979307U/en active Active
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