CN206602763U - An anti-electromagnetic interference circuit module - Google Patents

Abstract

The utility model provides an anti-electromagnetic interference circuit module scheme to increase the anti external impact ability with electrical apparatus, guarantee the circuit safety with electrical apparatus, it has two inputs and two outputs, its characterized in that: a voltage dependent resistor RV, a thermistor NTC, filter capacitors C1, C2, CY1 and CY2, a common mode inductor L1 and an inductor L2 are arranged between the two input ends and the two output ends; specifically, the input side of the common-mode block inductor L1 is connected in parallel with a voltage dependent resistor RV and a filter capacitor C1, the output side of the common-mode block inductor is connected in parallel with a filter capacitor C2, the filter capacitors CY1 and CY2 are connected in series and then connected in parallel with two ends of a filter capacitor C2, the connection point between the filter capacitors CY1 and CY2 is grounded, the inductor L2 is arranged between the filter capacitor C2 and the output side of the common-mode capacitor C1, and the thermistor NTC is arranged between the inductor L2 and the output end.

Description

An anti-electromagnetic interference circuit module

technical field

The utility model is an anti-interference application on the electric input side of an electrical appliance, in particular to an anti-electromagnetic interference circuit module.

Background technique

Due to the aging of the circuit, the electrical appliance will still have induction electricity after it is turned off, or the input side of the electrical appliance will be disturbed by surge and current noise due to the grid, which indicates that the noise is a two-way interference signal, and electronic equipment is both noise The object of interference is yet another source of noise. The interference of these induced electricity, surges and current noise will still affect the circuit after the electrical appliance is turned off. In the long run, this will not only affect the life of the electrical appliance, but also pose certain electrical safety hazards.

Utility model content

In order to overcome the defect of poor anti-electromagnetic interference in the prior art, this utility model proposes an anti-electromagnetic interference circuit module scheme to increase the external impact resistance of electrical appliances and ensure the circuit safety of electrical appliances. The specific technical content is as follows:

An anti-electromagnetic interference circuit module has two input terminals and two output terminals, and a piezoresistor RV, a thermistor NTC, and filter capacitors C1, C2, CY1 and CY2 are arranged between the two input terminals and the two output terminals , a common mode inductor L1, and an inductor L2; specifically, the input side of the common module inductor L1 is connected in parallel with a piezoresistor RV and a filter capacitor C1, and its output side is connected in parallel with a filter capacitor C2, and the filter capacitor CY1 and CY2 is connected in parallel to both ends of the filter capacitor C2 after being connected in series, the phase contact point between the filter capacitors CY1 and CY2 is grounded, the inductor L2 is provided between the filter capacitor C2 and the output side of the common mode capacitor C1, and the thermal The sensitive resistor NTC is arranged between the inductor L2 and the output terminal.

In one or more embodiments of the present invention, a fuse FUSE is connected between the input terminal and the input side of the common mode inductor L1.

In one or more embodiments of the present invention, the two input terminals are L input terminal and N input terminal respectively, and a fuse FUSE is connected between the L input terminal and the input side of the common mode inductor L1.

Under the same idea, the utility model also proposes an anti-electromagnetic interference circuit module, which has three input terminals and two output terminals, and the three input terminals are L input terminal, N input terminal and PE terminal respectively, and the L input terminal A piezoresistor RV, a thermistor NTC, filter capacitors C1, C2, CY1 and CY2, a common mode inductor L1, and an inductor L2 are arranged between the terminal and the N input terminal; specifically, the input side of the common module inductor L1 A piezoresistor RV and a filter capacitor C1 are connected in parallel, and a filter capacitor C2 is connected in parallel on the output side. The filter capacitors CY1 and CY2 are connected in parallel to both ends of the filter capacitor C2, and the filter capacitor CY1 and CY2 are connected in parallel. The phase contact point is connected to the PE terminal, the inductor L2 is provided between the filter capacitor C2 and the output side of the common mode capacitor C1, and the thermistor NTC is provided between the inductor L2 and the output terminal.

In one or more embodiments of the present invention, a fuse FUSE is connected between the L input terminal and the input side of the common mode inductor L1.

The beneficial effects of the utility model are: from the perspective of formation characteristics, power supply noise interference is divided into two types: series mode interference and common mode interference, and the anti-electromagnetic interference circuit module of this patent meets the requirements of electromagnetic compatibility (EMC). On the other hand, the external electromagnetic interference introduced by the line can also prevent the equipment from emitting noise to the outside, so as not to affect the normal operation of other electronic equipment in the same electromagnetic environment. In addition, the anti-electromagnetic interference circuit module of this patent can suppress both series mode and common mode interference.

The utility model is simple and effective in structure, has excellent technology and practicality, and is very suitable for popularization and use.

Description of drawings

FIG. 1 is a schematic diagram of the circuit structure of Embodiment 1 of the anti-electromagnetic interference circuit module of the present invention.

FIG. 2 is a schematic diagram of the circuit structure of Embodiment 2 of the anti-electromagnetic interference circuit module of the present invention.

detailed description

The scheme of this application is further described in conjunction with the accompanying drawings as follows:

Example 1

Referring to accompanying drawing 1, a kind of anti-electromagnetic interference circuit module has two input ends and two output ends, and described two input ends are respectively L input end and N input end, and between described L input end and N input end is provided with Varistor RV, thermistor NTC, filter capacitors C1, C2, CY1 and CY2, common mode inductor L1, and inductor L2; specifically, the input side of the common module inductor L1 is connected in parallel with the varistor RV and filter Capacitor C1, the output side of which is connected in parallel with a filter capacitor C2, the filter capacitors CY1 and CY2 are connected in parallel to both ends of the filter capacitor C2 in series, the contact point between the filter capacitors CY1 and CY2 is grounded, and the filter capacitor C2 The inductor L2 is arranged between the output side of the common mode capacitor C1, the thermistor NTC is arranged between the inductor L2 and the output end, and the fuse FUSE is connected between the L input end and the input side of the common mode inductor L1 .

Example 2

Referring to accompanying drawing 2, an anti-electromagnetic interference circuit module has three input terminals and two output terminals, and the three input terminals are L input terminal, N input terminal and PE terminal respectively, and the connection between the L input terminal and the N input terminal There are varistor RV, thermistor NTC, filter capacitors C1, C2, CY1 and CY2, common mode inductor L1, and inductor L2; specifically, the input side of the common module inductor L1 is connected in parallel with a varistor RV and filter capacitor C1, the output side of which is connected in parallel with a filter capacitor C2, the filter capacitors CY1 and CY2 are connected in parallel to both ends of the filter capacitor C2 after being connected in series, and the phase contact point between the filter capacitors CY1 and CY2 is connected to the At the PE end (that is, the grounding pin of the three-pin plug), the inductor L2 is provided between the filter capacitor C2 and the output side of the common mode capacitor C1, and the thermistor NTC is provided between the inductor L2 and the output terminal, A fuse FUSE is connected between the L input terminal and the input side of the common mode inductor L1.

In the above-mentioned embodiments 1 and 2, when common-mode interference occurs, the total inductance of the common-mode inductor L1 increases rapidly after coupling, so it presents a large inductive reactance to the common-mode signal, making it difficult for it to pass through. Its two coils are respectively wound on low-loss, high-permeability ferrite magnetic rings. When the rated current is large, the wire diameter of the common mode choke coil should also be increased accordingly to withstand large currents. . In addition, appropriately increasing the inductance can improve the low frequency attenuation characteristics.

The filter capacitors C1 and C2 are mainly used to filter out series-mode interference, and capacitors such as film capacitors can be used. The capacity range is roughly 0.01μF~0.47μF, and are mainly used to filter out series-mode interference. The filter capacitors CY1 and CY2 are connected across the output terminal and the midpoint is grounded, which can effectively suppress common-mode interference. C3 and C4 can be used together with ceramic capacitors, the capacity range is 2200Pf~0.1μF. In order to reduce the leakage current, the capacitance generally does not exceed 0.1μF, and the midpoint of the capacitor should be connected to the ground. As a preferred solution, the withstand voltage values of the filter capacitors C1, C2, CY1 and CY2 are all 630VDC or 250VAC.

The varistor RV is adaptively adjusted according to the voltage on the input side to avoid direct surge impact on subsequent circuits; the thermistor NTC is adaptively adjusted according to the ambient temperature to ensure the stability of the power output.

The above-mentioned preferred implementation mode should be regarded as an illustration of the implementation mode of the scheme of this application, and any technical deduction, replacement, improvement, etc. that are similar to, similar to, or based on the scheme of this application should be regarded as the scope of protection of this patent.

Claims (5)

1. a kind of anti-electromagnetic interference circuit module, with two inputs and two output ends, it is characterised in that：Two described inputs And two be provided with piezo-resistance RV, thermistor NTC, filter capacitor C1, C2, CY1 and CY2 between output end, common mode inductance L1, with And inductance L2；Specifically, the input side parallel connection of the common mode block inductance L1 is connected to piezo-resistance RV and filter capacitor C1, it is exported Side parallel connection is connected to filter capacitor C2, and filter capacitor C2 two ends, the filter are parallel to after filter capacitor CY1 and the CY2 series connection Provided with described between phase contact ground connection between ripple electric capacity CY1 and CY2, the outlet side of the filter capacitor C2 and common mode capacitance C1 Inductance L2, the thermistor NTC are located between the inductance L2 and output end.

2. anti-electromagnetic interference circuit module according to claim 1, it is characterised in that：The input and common mode inductance L1 Fuse FUSE is connected between input side.

3. anti-electromagnetic interference circuit module according to claim 1 or 2, it is characterised in that：Two input is respectively L Fuse FUSE is connected between input and N inputs, L inputs and common mode inductance the L1 input sides.

4. a kind of anti-electromagnetic interference circuit module, with three inputs and two output ends, three input is respectively L inputs End, N inputs and PE ends, it is characterised in that：Piezo-resistance RV, thermistor are provided between the L inputs and N inputs NTC, filter capacitor C1, C2, CY1 and CY2, common mode inductance L1, and inductance L2；Specifically, the common mode block inductance L1's is defeated Enter side parallel connection and be connected to piezo-resistance RV and filter capacitor C1, its outlet side parallel connection is connected to filter capacitor C2, the filter capacitor CY1 The phase contact being parallel to after being connected with CY2 between filter capacitor C2 two ends, the filter capacitor CY1 and CY2 draw be connected to it is described The inductance L2 is provided between PE ends, the outlet side of the filter capacitor C2 and common mode capacitance C1, the thermistor NTC is located at Between the inductance L2 and output end.

5. anti-electromagnetic interference circuit module according to claim 4, it is characterised in that：The L inputs and common mode inductance Fuse FUSE is connected between L1 input sides.