A multifunctional filter switch device for electromagnetic compatibility testing

Abstract

The invention discloses a multifunctional filter switch device for electromagnetic compatibility test, including a shell, an operating switch, a printed circuit board and a filter circuit, wherein a common input terminal, a DC input negative terminal, an AC zero line input terminal, a common output terminal, a DC output negative terminal and an AC zero line output terminal are installed on the shell, the operating switch is connected in series between the inner end of the common input terminal and the inner end of the common output terminal, and the filter circuit is respectively connected to the inner end of the common input terminal, the inner end of the DC input negative terminal, the inner end of the AC zero line input terminal, the inner end of the common output terminal, the inner end of the DC output negative terminal and the inner end of the AC zero line output terminal. The invention can meet the electromagnetic compatibility test requirements of various AC and DC power supply type equipment, has high reliability, can meet the index requirements at one time, is easy to use, and can be reused.

Description

Technical Field

[0001] The invention relates to an electromagnetic compatibility test device, in particular to a multifunctional filter switch device used for electromagnetic compatibility test. Background Art

[0002] In the traditional electromagnetic compatibility test process, when electronic equipment is required to be tested for voltage spikes caused by switching operations, simple switching operations such as single air switches or push button switches, single-pole double-throw switches, etc. are often used. As a result, the voltage spikes generated by the switching operation itself exceed the standard and cannot meet the test requirements.

[0003] In order to avoid the problem of excessive voltage spikes caused by the switch operation itself, the traditional method is to temporarily add a filter device to the switch to reduce the voltage spike interference caused by the manual switch operation. This method has low reliability due to the temporary connection of the filter circuit, and it is difficult to meet the index requirements, and it is even more difficult to meet the index requirements at one time. It is time-consuming and labor-intensive, and cannot be reused. Even so, the traditional temporary device of switch + filter circuit can only perform electromagnetic compatibility tests of a single DC power supply or AC power supply. It has a single function, is time-consuming and labor-intensive to manufacture, and is inconvenient to use. Summary of the invention

[0004] The purpose of the present invention is to provide a multifunctional filter switch device for electromagnetic compatibility testing with high reliability and repeatability in order to solve the above problems.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions:

[0006] A multifunctional filter switch device for electromagnetic compatibility testing, comprising a housing and an operating switch mounted on the housing, and also comprising a printed board and a filter circuit mounted on the printed board, wherein the housing is provided with a common input terminal, a DC input negative terminal, an AC neutral input terminal, a common output terminal, a DC output negative terminal and an AC neutral output terminal, wherein the outer end of the common input terminal is used to be connected to the positive pole of a DC power supply or the live wire of an AC power supply, the outer end of the DC input negative terminal is used to be connected to the negative pole of a DC power supply, and the outer end of the AC neutral input terminal is used to be connected to the positive pole of a DC power supply or the live wire of an AC power supply. The external end of the common output terminal, the external end of the DC output negative terminal and the external end of the AC neutral output terminal are respectively used to connect to corresponding loads, the operation switch is connected in series between the internal end of the common input terminal and the internal end of the common output terminal, and the filter circuit is respectively connected to the internal end of the common input terminal, the internal end of the DC input negative terminal, the internal end of the AC neutral input terminal, the internal end of the common output terminal, the internal end of the DC output negative terminal and the internal end of the AC neutral output terminal. The above-mentioned filter circuit can be determined according to actual needs, as long as the filtering function can be realized between the internal end of the common input terminal and the internal end of the common output terminal, between the internal end of the DC input negative terminal and the internal end of the DC output negative terminal, and between the internal end of the AC neutral input terminal and the internal end of the AC neutral output terminal.

[0007] Preferably, in order to achieve a good filtering function, the filtering circuit includes a first differential mode inductor, a second differential mode inductor, a third differential mode inductor, a common mode inductor, a first filter capacitor, a second filter capacitor, a third filter capacitor and a fourth filter capacitor, the common mode inductor includes a magnetic ring and three groups of coils wound on the magnetic ring, the inner end of the common input terminal is connected to one end of the first differential mode inductor, the other end of the first differential mode inductor, one end of the first filter capacitor, one end of the second filter capacitor and one end of the first group of coils of the common mode inductor are connected to each other, the inner end of the DC input negative terminal is connected to one end of the second differential mode inductor, the other end of the second differential mode inductor, the other end of the first filter capacitor and one end of the second group of coils of the common mode inductor are connected to each other. The common mode inductors are connected to each other, the inner end of the AC zero line input terminal is connected to one end of the third differential mode inductor, the other end of the third differential mode inductor, the other end of the second filter capacitor and one end of the third group of coils of the common mode inductor are connected to each other, the other end of the first group of coils of the common mode inductor, one end of the third filter capacitor, one end of the fourth filter capacitor and one end of the operation switch are connected to each other, the other end of the operation switch is connected to the inner end of the common output terminal, the other end of the second group of coils of the common mode inductor, the other end of the third filter capacitor and the inner end of the DC output negative terminal are connected to each other, and the other end of the third group of coils of the common mode inductor, the other end of the fourth filter capacitor and the inner end of the AC zero line output terminal are connected to each other.

[0008] Preferably, in order to wind three coils on a magnetic ring to form a common-mode inductor, the second group of coils and the third group of coils of the common-mode inductor are wound on the corresponding magnetic ring overlapping each other, and the second group of coils and the third group of coils of the common-mode inductor are isolated by high-temperature resistant insulating tape.

[0009] Preferably, for ease of operation, the operating switch is a single-pole double-throw rocker switch.

[0010] Preferably, in order to facilitate quick connection and disassembly with other devices, the common input terminal, the DC input negative terminal, the AC neutral input terminal, the common output terminal, the DC output negative terminal and the AC neutral output terminal are all jack terminals.

[0011] The beneficial effects of the present invention are:

[0012] The present invention integrates the operating switch and the filtering circuit in the same housing, and integrates the switch and filtering functions of the DC power supply and the AC power supply, so as to meet the electromagnetic compatibility test requirements of various AC and DC power supply type equipment, has high reliability, can meet the index requirements at one time, and only needs to connect the power supply and the corresponding load when in use, which is convenient to use and can be reused; by designing the common input terminal and the common output terminal as the common terminal of the DC power supply and the AC power supply and connecting the operating switch in series between the two, the components required for testing the DC power supply and the AC power supply separately are reduced, the structure is simplified without changing the function, the product volume and cost are reduced, and the application is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a three-dimensional exploded view of the multifunctional filter switch device for electromagnetic compatibility test of the present invention before assembly;

[0014] Figure 2 The invention discloses a circuit diagram of a multifunctional filter switch device for electromagnetic compatibility testing. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings:

[0016] like Figure 1 As shown, the multifunctional filter switch device for electromagnetic compatibility test of the present invention comprises a housing 12, an operating switch 13 mounted on the housing 12, a printed circuit board 5 and a filter circuit mounted on the printed circuit board 5, wherein the housing 12 is provided with a common input terminal 14, a DC input negative terminal 15, an AC neutral line input terminal 16, a common output terminal 8, a DC output negative terminal 10 and an AC neutral line output terminal 11, wherein the outer end of the common input terminal 14 is used to be connected to the positive pole of a DC power supply or the live wire of an AC power supply, the outer end of the DC input negative terminal 15 is used to be connected to the negative pole of a DC power supply, and the AC neutral line input terminal 16 is used to be connected to the negative pole of a DC power supply. The outer end of the terminal 16 is used to be connected to the neutral line of the AC power supply, the outer end of the common output terminal 8, the outer end of the DC output negative terminal 10 and the outer end of the AC neutral line output terminal 11 are respectively used to be connected to the corresponding loads, the operation switch 13 is connected in series between the inner end of the common input terminal 14 and the inner end of the common output terminal 8, and the filtering circuit is respectively connected to the inner end of the common input terminal 14, the inner end of the DC input negative terminal 15, the inner end of the AC neutral line input terminal 16, the inner end of the common output terminal 8, the inner end of the DC output negative terminal 10 and the inner end of the AC neutral line output terminal 11.

[0017] like Figure 1 and Figure 2As shown, the present invention also discloses the following multiple more optimized specific structures. According to actual needs, the above structure can be superimposed and combined with one or more of the following structures to form a more optimized technical solution.

[0018] In order to achieve good filtering function, the filtering circuit includes a first differential mode inductor L1, namely Figure 1 7. The second differential mode inductor L2 ( Figure 1 The third differential mode inductor L3 ( Figure 1 The common mode inductor L4 is not visible in the Figure 1 9. The first filter capacitor C1 is Figure 1 2. The second filter capacitor C2 is Figure 1 3. The third filter capacitor C3 is Figure 1 The 4th filter capacitor C4 is Figure 1 6, the common mode inductor L4 includes a magnetic ring and three sets of coils wound on the magnetic ring, and the common input terminal Vin+ is Figure 1 The inner end of 14 is connected to one end of the first differential mode inductor L1, the other end of the first differential mode inductor L1, one end of the first filter capacitor C1, one end of the second filter capacitor C2 and one end of the first coil of the common mode inductor L4 are connected to each other, and the DC input negative terminal Vin DC- Figure 1 The inner end of 15 is connected to one end of the second differential mode inductor L2, the other end of the second differential mode inductor L2, the other end of the first filter capacitor C1 and one end of the second coil of the common mode inductor L4 are connected to each other, and the AC zero line input terminal VinAC- Figure 1 The inner end of 16 is connected to one end of the third differential mode inductor L3, the other end of the third differential mode inductor L3, the other end of the second filter capacitor C2 and one end of the third group of coils of the common mode inductor L4 are connected to each other, the other end of the first group of coils of the common mode inductor L4, one end of the third filter capacitor C3, one end of the fourth filter capacitor C4 and the operation switch K are connected to each other. Figure 1 One end of 13 is connected to each other, and the other end of the operating switch K is connected to the common output terminal Vout+ Figure 1 The inner end of 8 is connected to the other end of the second coil of the common mode inductor L4, the other end of the third filter capacitor C3 and the DC output negative terminal Vout DC- Figure 1 The inner ends of 10 are connected to each other, the other end of the third coil of the common mode inductor L4, the other end of the fourth filter capacitor C4 and the AC zero line output terminal VoutAC- Figure 1 The inner ends of 11 are connected to each other. Figure 1 and Figure 2 The corresponding component names are marked with different symbols for the convenience of conventional expression. The corresponding components are the same component.

[0019] In order to wind three coils on a magnetic ring to form a common mode inductor 9, the second group of coils and the third group of coils of the common mode inductor 9 are overlapped and wound on the corresponding magnetic ring, and the second group of coils and the third group of coils of the common mode inductor 9 are isolated by high temperature resistant insulating tape.

[0020] For ease of operation, the operating switch 13 is a single-pole double-throw rocker switch.

[0021] In order to facilitate quick connection and disassembly with other equipment, the common input terminal 14, the DC input negative terminal 15, the AC neutral input terminal 16, the common output terminal 8, the DC output negative terminal 10 and the AC neutral output terminal 11 are all jack terminals.

[0022] Figure 1 Also shown is a cover plate 1 connected to the housing 12, which is a conventional structure.

[0023] like Figure 1 and Figure 2 When in use, select the access mode according to the power supply situation. If it is a DC power supply, connect the common input terminal 14, i.e. Figure 2 Connect Vin+ to the positive pole of the power supply, and connect the negative terminal 15 of the DC input to Figure 2 Connect Vin DC- to the negative pole of the power supply, and connect the common output terminal 8 to Figure 2 Connect the Vout+ of the load to the positive input terminal, and connect the negative terminal of the DC output to 10. Figure 2 The Vout DC- is connected to the negative input terminal of the load; if it is an AC power supply, the common input terminal 14, i.e. Figure 2 Connect Vin+ to the live wire of the power supply, and connect the AC neutral wire to terminal 16. Figure 2 Connect VinAC- to the neutral line of the power supply, and connect the common output terminal 8 Figure 2 Connect the Vout+ of the load to the live input terminal, and connect the AC neutral output terminal 11 to the Figure 2 The VoutAC- of the load is connected to the load neutral line input terminal. Since both connection modes have their own filtering circuits, the voltage spikes can be filtered well, so that the voltage spikes generated by the on-off operation of the switch 13 meet the standard requirements.

[0024] The above embodiments are only preferred embodiments of the present invention and are not limitations of the technical solutions of the present invention. Any technical solution that can be implemented on the basis of the above embodiments without creative work should be deemed to fall within the scope of protection of the patent of the present invention.

Claims

1. A multifunctional filter switch device for electromagnetic compatibility testing, comprising a housing and an operating switch mounted on the housing, characterized in that: The invention also includes a printed circuit board and a filter circuit installed on the printed circuit board. The housing is provided with a common input terminal, a DC input negative terminal, an AC neutral line input terminal, a common output terminal, a DC output negative terminal and an AC neutral line output terminal. The outer end of the common input terminal is used to be connected to the positive pole of a DC power supply or the live wire of an AC power supply. The outer end of the DC input negative terminal is used to be connected to the negative pole of a DC power supply. The outer end of the AC neutral line input terminal is used to be connected to the neutral line of an AC power supply. The outer end of the common output terminal, the outer end of the DC output negative terminal and the outer end of the AC neutral line output terminal are respectively used to be connected to corresponding loads. The operation switch is connected in series between the inner end of the common input terminal and the inner end of the common output terminal. The filter circuit is respectively connected to the inner end of the common input terminal, the inner end of the DC input negative terminal, the inner end of the AC neutral line input terminal, the inner end of the common output terminal, the inner end of the DC output negative terminal and the inner end of the AC neutral line output terminal.

2. The multifunctional filter switch device for electromagnetic compatibility testing according to claim 1, characterized in that: The filter circuit includes a first differential mode inductor, a second differential mode inductor, a third differential mode inductor, a common mode inductor, a first filter capacitor, a second filter capacitor, a third filter capacitor and a fourth filter capacitor. The common mode inductor includes a magnetic ring and three groups of coils wound on the magnetic ring. The inner end of the common input terminal is connected to one end of the first differential mode inductor, and the other end of the first differential mode inductor, one end of the first filter capacitor, one end of the second filter capacitor and one end of the first group of coils of the common mode inductor are connected to each other. The inner end of the DC input negative terminal is connected to one end of the second differential mode inductor, and the other end of the second differential mode inductor, the other end of the first filter capacitor and one end of the second group of coils of the common mode inductor are connected to each other. The inner end of the DC zero line input terminal is connected to one end of the third differential mode inductor, the other end of the third differential mode inductor, the other end of the second filter capacitor and one end of the third group of coils of the common mode inductor are connected to each other, the other end of the first group of coils of the common mode inductor, one end of the third filter capacitor, one end of the fourth filter capacitor and one end of the operation switch are connected to each other, the other end of the operation switch is connected to the inner end of the common output terminal, the other end of the second group of coils of the common mode inductor, the other end of the third filter capacitor and the inner end of the DC output negative terminal are connected to each other, and the other end of the third group of coils of the common mode inductor, the other end of the fourth filter capacitor and the inner end of the AC zero line output terminal are connected to each other.

3. The multifunctional filter switch device for electromagnetic compatibility testing according to claim 2, characterized in that: The second group of coils and the third group of coils of the common mode inductor are overlapped and wound on the corresponding magnetic rings, and the second group of coils and the third group of coils of the common mode inductor are isolated by a high temperature resistant insulating tape.

4. The multifunctional filter switch device for electromagnetic compatibility testing according to claim 1, 2 or 3, characterized in that: The operating switch is a single-pole double-throw rocker switch.

5. The multifunctional filter switch device for electromagnetic compatibility testing according to claim 1, 2 or 3, characterized in that: The common input terminal, the DC input negative terminal, the AC neutral line input terminal, the common output terminal, the DC output negative terminal and the AC neutral line output terminal are all jack terminals.

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