CN213367634U

CN213367634U - Connector type EMI filter considering overvoltage surge and undervoltage surge

Info

Publication number: CN213367634U
Application number: CN202022439240.5U
Authority: CN
Inventors: 卞卡
Original assignee: AERODEV ELECTROMAGNETIC TECH Inc
Current assignee: AERODEV ELECTROMAGNETIC TECH Inc
Priority date: 2020-10-28
Filing date: 2020-10-28
Publication date: 2021-06-04
Anticipated expiration: 2030-10-28

Abstract

The utility model relates to a compromise connector formula EMI wave filter of excessive pressure surge and under-voltage surge belongs to electromagnetic compatibility technical field. A connector, a filter circuit, an overvoltage protection circuit and an undervoltage protection circuit are arranged in the same metal shielding housing; a filter circuit, an overvoltage protection circuit and an undervoltage protection circuit are sequentially arranged between the two ends of the power connector. The utility model discloses with power connector, EMI filter circuit, overvoltage crowbar, undervoltage protection circuit integrated as an organic whole, reduced greatly at different levels between the module walk the line, improved space utilization, and then improve the electromagnetic compatibility performance of system. The integrated module has the advantages of small size, strong anti-interference capability, convenience in use and the like, and effectively solves the problems of complex design, weak anti-interference capability and large size of a power supply front-end circuit.

Description

Connector type EMI filter considering overvoltage surge and undervoltage surge

Technical Field

The utility model relates to a compromise connector formula EMI wave filter of excessive pressure surge and under-voltage surge belongs to electromagnetic compatibility technical field.

Background

In the current airborne avionics system, the integration level of equipment is higher and higher, and the airborne equipment requires higher modularization and integration design due to the requirement of strict control on the volume and weight of the airborne equipment. An electromagnetic interference filter (EMI power filter) is required to integrate more protection functions, such as overvoltage surge and undervoltage surge at the front end of a power supply, as a necessary device for solving EMI interference. The filter integrating the connector, the filter circuit, the overvoltage protection circuit and the undervoltage protection circuit has more advantages in performance, volume and weight, and simplifies complicated circuit design.

Disclosure of Invention

The utility model aims at solving the technical problem that EMI wave filter compromises excessive pressure surge and under-voltage surge.

In order to solve the above problems, the present invention provides a connector-type EMI filter that can balance overvoltage surge and undervoltage surge; a connector, a filter circuit, an overvoltage protection circuit and an undervoltage protection circuit are arranged in the same metal shielding housing; a filter circuit, an overvoltage protection circuit and an undervoltage protection circuit are sequentially arranged between the two ends of the power connector.

Preferably, the filter circuit is configured as a C-L-C-L filter circuit.

Preferably, the filter circuit is connected with an overvoltage protection circuit, and an MOS transistor is arranged in the overvoltage protection circuit.

Preferably, the overvoltage protection circuit is connected with the undervoltage protection circuit, and an energy storage capacitor is arranged in the undervoltage protection circuit.

Compared with the prior art, the utility model discloses following beneficial effect has:

the utility model aims at providing an EMI filter which can take both overvoltage surge and undervoltage surge into account, which integrates a connector, a filter circuit, an overvoltage protection circuit and an undervoltage protection circuit and is used for reducing the volume and the weight of a corresponding functional module; the integrated filter module can greatly reduce the wiring length of the cascade circuit and effectively improve the electromagnetic compatibility characteristic of the interface circuit. The utility model discloses with connector, overvoltage crowbar, undervoltage protection circuit and equipment power filter integration in same casing, finally realize the high integration of power front end protection circuit, filter circuit, connector to reduce functional module's volume and weight.

The utility model has the advantages that:

1. due to the integration of the functional modules, the wiring length between each level of circuits can be effectively reduced, the problem of electromagnetic radiation caused by overlong wiring can be greatly reduced, and the electromagnetic compatibility of the system is improved;

2. the integrated filtering protection module has smaller volume and lighter weight;

3. the product gives consideration to the connector, the filter circuit, the overvoltage protection circuit and the undervoltage protection circuit, and greatly simplifies the design period and the design difficulty of the power supply front-end circuit.

Drawings

Fig. 1 is a circuit logic block diagram of the EMI filter of the present invention.

Fig. 2 is a schematic structural diagram of the present invention.

Fig. 3 is a schematic view of the internal structure of the present invention.

Reference numerals: 1. a power supply connector; a C-L-C-L filtering module; 3. an overvoltage protection module; 4. an under-voltage protection module; 5. a metal shielding can; 6. an output line;

Detailed Description

In order to make the present invention more comprehensible, preferred embodiments are described in detail below with reference to the accompanying drawings:

as shown in fig. 1-3, the present invention provides a connector-type EMI filter that considers both overvoltage and undervoltage surges; a power supply connector 1, a filter circuit, an overvoltage protection circuit and an undervoltage protection circuit are arranged in the same metal shielding housing 5; a filter circuit, an overvoltage protection circuit and an undervoltage protection circuit are sequentially arranged between the two ends of the power connector 1. The filter circuit is a C-L-C-L filter circuit. The filter circuit is connected with the overvoltage protection circuit, and an MOS tube is arranged in the overvoltage protection circuit. The overvoltage protection circuit is connected with the undervoltage protection circuit, and an energy storage capacitor is arranged in the undervoltage protection circuit.

As shown in fig. 2 and 3, the filter of the present invention has the following structure: the device comprises a power supply connector 1, a metal shielding housing 5, a C-L-C-L filtering module 2, an overvoltage protection module 3 and an undervoltage protection module 4; the power supply connector 1 is provided with an output line 6; a C-L-C-L filter circuit is arranged in the C-L-C-L filter module 2; an overvoltage protection circuit is arranged in the overvoltage protection module 3; an undervoltage protection circuit is arranged in the undervoltage protection module 4.

The utility model discloses the theory of operation: as shown in FIG. 1, the circuit structure of the EMI filter of the present invention integrates an overvoltage protection circuit based on MOS transistor and an undervoltage protection circuit based on energy storage capacitor at the rear end of the conventional C-L-C-L filter circuit. When an overvoltage event occurs in the circuit, the overvoltage protection circuit clamps the level within a normal level range; when an undervoltage event occurs in the circuit, the energy storage capacitor supplies energy to the rear-end circuit through the diode so as to keep stable power supply.

Therefore the utility model discloses EMI wave filter has compromise filtering, excessive pressure protection, under-voltage safeguard function, and structural and power connector make an organic whole, highly inherited the filtering and the safeguard function of power front end.

The foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the present invention in any way and in any way, and it should be understood that modifications and additions may be made by those skilled in the art without departing from the scope of the present invention. Those skilled in the art can make various changes, modifications and evolutions equivalent to those made by the above-disclosed technical content without departing from the spirit and scope of the present invention, and all such changes, modifications and evolutions are equivalent embodiments of the present invention; meanwhile, any changes, modifications and evolutions of equivalent changes to the above embodiments according to the actual technology of the present invention are also within the scope of the technical solution of the present invention.

Claims

1. A connector type EMI filter giving consideration to both overvoltage surge and undervoltage surge; the method is characterized in that: a connector, a filter circuit, an overvoltage protection circuit and an undervoltage protection circuit are arranged in the same metal shielding housing; a filter circuit, an overvoltage protection circuit and an undervoltage protection circuit are sequentially arranged between the two ends of the power connector.

2. The connector-based EMI filter for both overvoltage surges and undervoltage surges as set forth in claim 1, wherein: the filter circuit is set as a C-L-C-L filter circuit.

3. The connector-based EMI filter for both overvoltage surges and undervoltage surges as set forth in claim 2, wherein: the filter circuit is connected with the overvoltage protection circuit, and an MOS tube is arranged in the overvoltage protection circuit.

4. The connector-based EMI filter of claim 3 that is both overvoltage and undervoltage surge tolerant, wherein: the overvoltage protection circuit is connected with the undervoltage protection circuit, and an energy storage capacitor is arranged in the undervoltage protection circuit.