Combined coupling network based on switch switching

Abstract

The utility model provides a combined coupling network based on switch switching, comprising a resistor module used for voltage reduction and a capacitor module used for filtering, the resistor module is connected with the capacitor module through a first switch module; the resistor module comprises a plurality of resistor combinations of CN M2, CN M3 and CN M4, and the first switch module is used for controlling the type and number of the resistor combinations connected with the capacitor module in the resistor module. According to the utility model, a plurality of coupling networks can be combined into one, so that the production and later maintenance cost is saved.

Description

TECHNICAL FIELD

[0001] The utility model relates to electromagnetic compatibility (EMC) test technical field, specifically related to a kind of combination coupling network based on switch switching. BACKGROUND

[0002] With the continuous development of electronic and electrical technology, the electromagnetic environment of electronic equipment is increasingly complex, in the prior art, in order to test the electromagnetic interference immunity of electronic equipment during operation, by injecting surge wave 1.2 / 50 μs (8 / 20 μs), 10 / 700 μs (5 / 320 μs), ringing wave, damped oscillation wave and other types of interference wave, evaluate the immunity level of electronic equipment to input waveform.

[0003] The generator generates interference wave, and the interference waveform is injected into the cable connected to the electronic equipment under test through the coupling network, and the coupling network can also limit the current injected from the cable of the electronic equipment under test to the generator, so as to prevent damage to the generator body and reduce the influence on the output waveform of the generator.

[0004] As shown in Figures 1-3 CN M2 coupling network, CN M3 coupling network, CN M4 coupling network. In the standard IEC61000-4-16, 0Hz-150kHz common mode conducted disturbance immunity test needs to use coupling network CNM2, CN M3, CN M4, according to the circuit requirement at the time of test, three networks are designed respectively, and three independent coupling networks are designed, manufactured, deployed and maintained, which increases the hardware cost, research and development cost, production cost and later maintenance cost of users, and causes great inconvenience to users. UTILITY MODEL CONTENT

[0005] Therefore, the utility model wants to solve the problem to provide a kind of combination coupling network based on switch switching, multiple coupling networks can be combined into one, and production and later maintenance cost is saved.

[0006] To solve the above technical problems, the utility model adopts the technical scheme that:

[0007] A kind of combination coupling network based on switch switching, including resistance module for voltage reduction and capacitor module for filtering, the resistance module is connected with capacitor module by first switch module;

[0008] The resistance module includes several CN M2, CN M3 and CN M4 resistance combination, and the first switch module is used to control the resistance combination category and quantity connected with the capacitor module in the resistance module.

[0009] Further, the capacitor module is connected with the second switch module for controlling whether the capacitor module is connected to the circuit.

[0010] Further, the first switch module includes a plurality of first switches, and the first switches are multi-stage switches.

[0011] Further, the resistance module includes resistors R1, R2, R3, R4, R5, R6, R7, R8 and R9, the resistors R1 and R2 or the resistors R3 and R4 are CN M2 resistance combinations, the resistors R3, R4, R5 or the resistors R7, R8 and R9 are CN M3 resistance combinations, and the resistors R3, R4, R5 and R6 are CN M4 resistance combinations.

[0012] Further, the capacitor module includes capacitors C1, C2, C3 and C4, and the capacitors C1, C2, C3 and C4 are connected with the resistors in the CN M4 resistance combinations in a one-to-one correspondence.

[0013] The first switch module is used for controlling the connection of the CN M3 resistance combinations or the CN M2 resistance combinations with the capacitors C1, C2, C3 and C4.

[0014] The utility model has the advantages and positive effects that:

[0015] By setting the first switch module, the first switch module includes a plurality of multi-stage first switch groups, and by controlling the action of the first switch groups, the resistance combinations of CN M2, CN M3 and CN M4 in the resistance module are connected to the circuit. By controlling the type and quantity of the resistance combinations connected to the circuit, the resistance values of the resistors in the capacitor module are changed, so that the combined coupling network is compatible with different interference waves and measured devices, a plurality of coupling networks can be combined into one, and the production and maintenance costs in the later period are saved. DETAILED DESCRIPTION

[0016] The accompanying drawings are used to provide a further understanding of the utility model, and constitute a part of the specification, are used to explain the utility model together with embodiments of the utility model, and do not constitute the limitation to the utility model. In the drawings:

[0017] Figure 1 is a CN M2 coupling network circuit diagram;

[0018] Figure 2 is a CN M3 coupling network circuit diagram;

[0019] Figure 3 is a CN M4 coupling network circuit diagram;

[0020] Figure 4 is a whole system diagram of the combined coupling network based on switch switching of the utility model;

[0021] Figure 5It is a circuit diagram of a combined coupling network based on switch switching according to the utility model.

[0022] In the drawing: 1, power supply AE; 2, measured equipment EUT; 3, capacitor module; 4, second switch module; 5, first switch module; 6, resistance module; 7, generator. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the utility model belongs. The terms used in the specification of the utility model are only for the purpose of describing specific embodiments and are not intended to limit the utility model. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0025] The utility model provides a kind of combined coupling network based on switch switching, as Figure 4 As shown, it includes measured equipment EUT2 and power supply AE1, and power supply AE1 is connected with measured equipment EUT2 by cable, and the cable is connected with generator 7 by combined coupling network, and the combined coupling network is used to adjust the voltage amplitude of interference wave and filter out noise. The process of detecting the anti-interference performance of measured equipment is: power supply normally supplies power, generator 7 outputs interference wave, and the interference wave enters the cable through the combined coupling network to interfere with the measured equipment, and the working performance of the measured equipment under the environment of specific frequency interference wave is detected.

[0026] One embodiment of the application is that a decoupling circuit is provided between the cable and the power supply, and the decoupling circuit is used to remove the influence of the interference wave on the power supply.

[0027] Because different measured equipment has different power supply voltage and power supply pin number, and the type of interference wave output by generator 7 is different, the corresponding coupling network is also different. For example, the measured equipment is a small electric fan, the power supply end contains positive and negative poles, and CNM2 coupling network is used; when the measured equipment is a driving motor, the power supply end contains three-phase line and ground pole, and CNM4 coupling network is used.

[0028] The combined coupling network comprises a resistance module 6 for voltage reduction and a capacitance module 3 for filtering, and the resistance module 6 is connected with the capacitance module 3 through a first switch module 5.

[0029] One embodiment of the application is that the resistance module 6 is connected with the capacitance module 3 through simultaneously controlling the action of the plurality of first switch groups.

[0030] The cable comprises a plurality of power supply wires, the capacitance module 3 comprises a plurality of capacitors, and the resistance module 6 comprises a plurality of resistance combinations.

[0031] The input end of the capacitor in the capacitance module 3 is connected with the plurality of resistance combinations through the plurality of first switch groups, the resistance combinations are connected in parallel with each other, the resistance value of the input end of the capacitor is adjusted, the combined coupling network is compatible with a plurality of voltage reduction effects, and the combined coupling network is compatible with different interference waves and measured devices.

[0032] The capacitance module 3 is connected with a second switch module 4, and the second switch module 4 is used for controlling whether the capacitance module 3 is connected into a circuit.

[0033] The second switch module 4 comprises a plurality of second switches, the second switches are one-to-one corresponding to the capacitors in the capacitance module 3, and the connection relationship is parallel connection.

[0034] The working principle and working process of the utility model are as follows:

[0035] As Figure 5As shown, the output end of the generator 7 includes a HOT pin and a COM pin, the COM pin is grounded, and the HOT pin is used to output the interference wave. The resistance module 6 includes resistors R1, R2, R3, R4, R5, R6, R7, R8, and R9, the resistors R1 and R2 or the resistors R3 and R4 are a CN M2 resistance combination, the resistors R3, R4, and R5 or the resistors R7, R8, and R9 are a CN M3 resistance combination, and the resistors R3, R4, R5, and R6 are a CN M4 resistance combination. The capacitance module 3 includes capacitors C1, C2, C3, and C4, and the first switch module 5 only includes one first switch group, which is composed of four first switches with three gears.

[0036] The resistors in the CN M4 resistance combination are directly connected in series with the corresponding capacitors in the capacitance module 3, and the input end of each capacitor is connected to a corresponding first switch, and the first switch group uniformly controls the synchronous action of all the first switches.

[0037] When the first switch group is in gear one, only the CN M4 resistance combination is connected to the circuit, at this time, it is a CN M4 coupling circuit, when the first switch group is in gear two, the two CN M3 resistance combinations are simultaneously connected to the circuit, at this time, it is a CN M3 coupling circuit, and when the first switch group is in gear three, the two CN M2 resistance combinations are simultaneously connected to the circuit, at this time, it is a CN M2 coupling circuit.

[0038] One embodiment of the present application is that the resistance module 6 includes a plurality of CN M4 resistance combinations, CN M3 resistance combinations, and CN M2 resistance combinations, and the types and quantities of the CN M4 resistance combinations, CN M3 resistance combinations, and CN M2 resistance combinations are controlled by a plurality of first switch groups.

[0039] One embodiment of the present application is that when the measured device needs a CN M4 coupling circuit, a plurality of CN M4 resistance combinations are combined to build the required CN M4 coupling circuit, when the measured device needs a CN M3 coupling circuit, a plurality of CN M3 resistance combinations are combined to build the required CN M3 coupling circuit, and when the measured device needs a CN M2 coupling circuit, a plurality of CN M2 resistance combinations are combined to build the required CN M2 coupling circuit.

[0040] The embodiments of the present application are described in detail above, but the content described is only a preferred embodiment of the present application, and cannot be considered as limiting the scope of the implementation of the present application. Any equivalent changes and improvements made within the scope of the present application should still belong to the scope of the present patent.

Claims

1. A switched combination coupling network, comprising: The application relates to a voltage reduction and filtering circuit, which comprises a resistance module (6) for voltage reduction and a capacitor module (3) for filtering, wherein the resistance module (6) is connected with the capacitor module (3) through a first switch module (5); The resistance module (6) comprises a plurality of CN M2, CN M3 and CN M4 resistance combinations, and the first switch module (5) is used for controlling the type and quantity of the resistance combinations connected with the capacitor module (3) in the resistance module (6).

2. The combination of switched-based coupling networks according to claim 1, wherein, The capacitor module (3) is connected with a second switch module (4) used for controlling whether the capacitor module (3) is connected with the circuit.

3. The combination of switched-based coupling networks according to claim 1, wherein, The first switch module (5) comprises a plurality of first switch groups, and the first switch groups are multi-stage switches.

4. The combination switched-based coupling network of claim 1, wherein, The resistance module (6) comprises resistances R1, R2, R3, R4, R5, R6, R7, R8 and R9, the resistances R1 and R2 or the resistances R3 and R4 are CN M2 resistance combinations, the resistances R3, R4, R5 or the resistances R7, R8 and R9 are CN M3 resistance combinations, and the resistances R3, R4, R5 and R6 are CN M4 resistance combinations.

5. A combination switched-based coupling network according to claim 4, wherein, The capacitor module (3) comprises capacitors C1, C2, C3 and C4, and the capacitors C1, C2, C3 and C4 are connected with the resistances in the CN M4 resistance combinations in a one-to-one mode. The first switch module (5) is used for controlling the CN M3 resistance combinations or the CN M2 resistance combinations to be connected with the capacitors C1, C2, C3 and C4.

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