阅读说明：本技术 一种抗干扰电路及电源适配器 (Anti-interference circuit and power adapter ) 是由 曾书明 曾金芝 于 2021-09-27 设计创作，主要内容包括：本发明涉及电子技术领域,尤其涉及一种抗干扰电路及电源适配器。该电路包括电流输入端,电流输入端用于与外部电源电连接后电流的输入；整流模块,整流模块与电流输入端电连接；滤波模块,滤波模块与整流模块电连接；抗干扰控制模块,抗干扰控制模块与整流模块电连接,用于对输入的电流进行稳压调节；取样模块,取样模块分别与滤波模块和抗干扰控制模块电连接；电流输出端,电流输出端与滤波模块电连接。通过取样模块将滤波模块中的电流强度反馈到抗干扰控制模块上,进一步的抗干扰控制模块对整流模块传输的电流进行调控,从而降低抗干扰电路各部分之间相互影响,有效的保证了抗干扰电路电流的稳定输出。(The invention relates to the technical field of electronics, in particular to an anti-interference circuit and a power adapter. The circuit comprises a current input end, a current output end and a current output end, wherein the current input end is used for inputting current after being electrically connected with an external power supply; the rectifying module is electrically connected with the current input end; the filtering module is electrically connected with the rectifying module; the anti-interference control module is electrically connected with the rectifying module and is used for carrying out voltage-stabilizing regulation on input current; the sampling module is electrically connected with the filtering module and the anti-interference control module respectively; and the current output end is electrically connected with the filtering module. On feeding back the current strength in the filtering module to the anti-interference control module through the sampling module, further anti-interference control module regulates and control the current of rectifier module transmission to reduce the influence each other between each part of anti-interference circuit, the effectual stable output of guaranteeing the anti-interference circuit current.)

1. An immunity circuit, comprising:

the current input end is used for inputting current after being electrically connected with an external power supply;

the rectifying module is electrically connected with the current input end and is used for performing anti-electromagnetic processing on input current;

the filtering module is electrically connected with the rectifying module and can convert alternating current transmitted by the rectifying module into direct current and filter redundant alternating current in the filtering module;

the anti-interference control module is electrically connected with the rectifying module and is used for performing voltage stabilization regulation on the current input into the rectifying module;

the sampling module is respectively and electrically connected with the filtering module and the anti-interference control module, and the sampling module is used for feeding the current intensity in the filtering module back to the anti-interference control module;

and the current output end is electrically connected with the filtering module and is used for outputting current after the current output end is electrically connected with electric equipment.

2. The immunity circuit of claim 1, wherein the immunity control module comprises a first control unit, an immunity circuit, and an absorption circuit, the first control unit being electrically connected to the immunity circuit and the sampling module, respectively, the absorption circuit being electrically connected to the rectification module, the absorption circuit being capable of maintaining a voltage input to the filtering module below 650V, the immunity circuit being electrically connected to the rectification module, the immunity circuit being capable of reducing electromagnetic radiation in the circuit.

3. The immunity circuit according to claim 2, wherein the immunity circuit includes a resistor R7, a resistor R14, a resistor R15, a diode D7, a MOS transistor Q3, and a transistor Q1, one end of the resistor R7 is electrically connected to the first control unit, the other end of the resistor R7 is electrically connected to the input terminal of the diode D7 and the output terminal of the MOS transistor Q3, one end of the resistor R14 is electrically connected to the output terminal of the diode D7, the input terminal of the MOS transistor Q3, and the resistor R15, the resistor R15 is electrically connected to the input terminal of the transistor Q1, and the other end of the resistor R14 is electrically connected to the input terminal of the transistor Q3 and the transistor Q1.

4. The immunity circuit of claim 2, wherein the snubber circuit comprises a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C6, and a diode D6, the resistor R8 is connected in series with the resistor R10 to form a first portion, the resistor R9 is connected in series with the resistor R11 to form a second portion, the resistor R12 is connected in series with the capacitor C6 to form a third portion, the first portion, the second portion, and the third portion are connected in parallel with each other, an input terminal of the second portion is electrically connected to the rectifier module, an output terminal of the second portion is electrically connected to an output terminal of the diode D6, and an input terminal of the diode D6 is electrically connected to the immunity circuit.

5. The immunity circuit of claim 1, wherein said sampling module comprises a second control unit and a sampling circuit, said sampling circuit being electrically connected to said second control unit and said filtering module, respectively.

6. The immunity circuit according to claim 5, wherein the sampling circuit includes a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a capacitor C7, a sampling unit U3, and a third control unit, the resistor R21, the resistor R17, the resistor R18, the resistor R19, and the capacitor C7 are sequentially connected in series, the resistor R21 and the capacitor C7 are both electrically connected to the third control unit, one end of the resistor R20 is electrically connected to the third control unit and the resistor R21, the other end of the resistor R20 is electrically connected to the capacitor C7, one end of the resistor R16 is electrically connected to the resistor R19, the resistor R18, and the output end of the sampling unit U3, and the other end of the resistor R16 is electrically connected to the input end of the sampling unit U3 and the filter module.

7. The antijam circuit of claim 1, wherein the filter module includes a transformer circuit and a filter circuit, the transformer circuit being electrically connected to the rectifier module, the sampling module and the filter circuit, respectively, the transformer circuit including a pin 10 and a pin 9, the filter circuit being electrically connected to the current output.

8. The antijamming circuit of claim 7, wherein the filter circuit includes a resistor R24, a filter capacitor EC3, a filter capacitor EC4, and a capacitor C9, the resistor R24, the filter capacitor EC3, the filter capacitor EC4, and the capacitor C9 are connected in parallel, one end of the parallel resistor R24 is electrically connected to the pin 10 and one pin of the current output terminal, and the other end of the parallel resistor R24 is electrically connected to the pin 9 and the other pin of the current output terminal.

9. A power adapter comprising the tamper resistant circuit of any one of claims 1-8.

Technical Field

The invention relates to the technical field of electronics, in particular to an anti-interference circuit and a power adapter.

Background

The power adapter is a power supply conversion device for small portable electronic equipment and electronic appliances, converts alternating current input into direct current output according to the working principle, and is widely applied to equipment such as security cameras, set top boxes, routers, light bars and the like. When the traditional power adapter outputs current, the circuits interfere with each other due to the mutual magnetic effect, and further the output of the current is unstable.

Disclosure of Invention

The invention provides an anti-interference circuit, which is used for solving the problem of unstable current output caused by mutual interference due to the mutual magnetic effect among adapter circuits in the prior art.

To solve the above problem, in a first aspect, the present invention provides an anti-jamming circuit, including:

the current input end is used for inputting current after being electrically connected with an external power supply;

the rectifying module is electrically connected with the current input end and is used for performing anti-electromagnetic processing on input current;

the filtering module is electrically connected with the rectifying module and can convert alternating current transmitted by the rectifying module into direct current and filter redundant alternating current in the filtering module;

the anti-interference control module is electrically connected with the rectifying module and is used for performing voltage stabilization regulation on the current input into the rectifying module;

the sampling module is respectively and electrically connected with the filtering module and the anti-interference control module, and the sampling module is used for feeding the current intensity in the filtering module back to the anti-interference control module;

and the current output end is electrically connected with the filtering module and is used for outputting current after the current output end is electrically connected with electric equipment.

According to the first aspect, in one possible implementation manner, the anti-interference control module includes a first control unit, an anti-interference circuit and an absorption circuit, the first control unit is electrically connected to the anti-interference circuit and the sampling module, respectively, the absorption circuit is electrically connected to the rectifying module, the absorption circuit can keep the voltage input to the filtering module below 650V, the anti-interference circuit is electrically connected to the rectifying module, and the anti-interference circuit can reduce electromagnetic radiation in the circuit.

According to the first aspect, in a possible implementation manner, the anti-jamming circuit includes a resistor R7, a resistor R14, a resistor R15, a diode D7, a MOS transistor Q3, and a transistor Q1, one end of the resistor R7 is electrically connected to the first control unit, the other end of the resistor R7 is electrically connected to the input end of the diode D7 and the output end of the MOS transistor Q3, one end of the resistor R14 is electrically connected to the output end of the diode D7, the input end of the MOS transistor Q3, and the resistor R15, the resistor R15 is electrically connected to the input end of the transistor Q1, and the other end of the resistor R14 is electrically connected to the input end of the MOS transistor Q3 and the transistor Q1.

In a possible implementation manner, according to the first aspect, the absorption circuit includes a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C6, and a diode D6, the resistor R8 and the resistor R10 are connected in series to form a first portion, the resistor R9 and the resistor R11 are connected in series to form a second portion, the resistor R12 and the capacitor C6 are connected in series to form a third portion, the first portion, the second portion, and the third portion are connected in parallel to each other, an input end of the second portion is electrically connected to a rectification module, an output end of the second portion is electrically connected to an output end of the diode D6, and an input end of the diode D6 is electrically connected to the anti-jamming circuit.

In a possible implementation form according to the first aspect, the sampling module comprises a second control unit and a sampling circuit, the sampling circuit being electrically connected to the second control unit and the filtering module, respectively.

According to the first aspect, in a possible implementation manner, the sampling circuit includes a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a capacitor C7, a sampling unit U3, and a third control unit, the resistor R21, the resistor R17, the resistor R18, the resistor R19, and the capacitor C7 are sequentially connected in series, the resistor R21 and the capacitor C7 are both electrically connected to the third control unit, one end of the resistor R20 is electrically connected to the third control unit and the resistor R21, the other end of the resistor R20 is electrically connected to the capacitor C7, one end of the resistor R16 is electrically connected to the resistor R19, the resistor R18, and the output end of the sampling unit U3, and the other end of the resistor R16 is electrically connected to the input end of the sampling unit U3 and the filter module.

In a possible implementation form according to the first aspect, the filter module includes a transformer circuit and a filter circuit, the transformer circuit is electrically connected to the rectifier module, the sampling module and the filter circuit respectively, the transformer circuit includes a pin 10 and a pin 9, and the filter circuit is electrically connected to the current output terminal.

According to the first aspect, in a possible implementation manner, the filter circuit includes a resistor R24, a filter capacitor EC3, a filter capacitor EC4, and a capacitor C9, the resistor R24, the filter capacitor EC3, the filter capacitor EC4, and the capacitor C9 are connected in parallel, one end of the resistor R24 connected in parallel is electrically connected to the pin 10 and a pin on the current output terminal, and the other end of the resistor R24 connected in parallel is electrically connected to the pin 9 and another pin on the current output terminal.

In a second aspect, the present invention also provides a power adapter comprising any of the above immunity circuits.

The invention has the beneficial effects that: the invention provides an anti-interference circuit, which comprises a rectifying module, a filtering module, an anti-interference control module and a sampling module, wherein when current is input into the rectifying module, the current is subjected to diamagnetic treatment and then is transmitted to the filtering module, the current intensity in the filtering module is fed back to the anti-interference control module through the sampling module, and the anti-interference control module further regulates and controls the current transmitted by the rectifying module, so that the mutual influence among all parts of the anti-interference circuit is reduced, and the stable output of the current of the anti-interference circuit is effectively ensured.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 shows a control flow diagram of a jamming immunity circuit;

FIG. 2 shows a schematic circuit diagram of the immunity circuit;

FIG. 3 shows a schematic circuit diagram of the immunity circuit;

fig. 4 shows a schematic circuit diagram of a filter module;

FIG. 5 is a schematic diagram showing a circuit configuration of the absorption circuit;

fig. 6 shows a schematic circuit diagram of the sampling module.

Description of the main element symbols:

100-current input; 200-a rectifying module; 300-a filtering module; 400-anti-interference control module; 410-a first control unit; 420-an anti-jamming circuit; 430-absorption circuit; 500 a sampling module; 600-current output terminal.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

Referring to fig. 1 and fig. 2, the present invention provides an anti-jamming circuit (hereinafter referred to as a circuit for short) including a current input terminal 100, a rectifying module 200, a filtering module 300, an anti-jamming control module 400, a sampling module 500, and a current output terminal 600.

Specifically, the current input terminal 100 is electrically connected to the rectifying module 200, the rectifying module 200 is electrically connected to the anti-interference control module 400 and the filtering module 300, the filtering module 300 is electrically connected to the sampling module 500 and the current output terminal 600, the sampling module 500 is electrically connected to the anti-interference control module 400, and the current input terminal 100 is used for inputting current after being electrically connected to an external power supply.

The current output end 600 is used for outputting current after being electrically connected with electric equipment, when the current is input to the rectifying module 200 from the current input end 100, the rectifying module 200 performs anti-electromagnetic processing on the input current, further transmits the processed current to the filtering module 300, the filtering module 300 converts alternating current transmitted by the rectifying module into direct current, and simultaneously filters redundant alternating current transmitted into the filtering module 300 and then outputs the filtered alternating current to the current output end 600.

While current is being input to the rectifier module 200 from the current input 100, the rectifier module 200 will simultaneously pass the current to the immunity control module 400. Still be connected with sampling module 500 between anti-interference control module 400 and filter circuit 300, sampling module 500 is arranged in feeding back anti-interference control module 400 with the electric current in filter module 300, anti-interference control module 400 will be to coming from rectifier module 200 and the electric current that comes from sampling circuit 500 contrast this moment, further anti-interference control module 400 carries out steady voltage regulation to the electric current of input rectifier module 200, the current output that each part electromagnetic interference arouses among the anti-interference circuit is unstable, the effectual stable output of electric current in the circuit of having guaranteed.

Referring to fig. 1 and fig. 2, the anti-jamming control module 400 includes a first control unit 410, an anti-jamming circuit 420, and an absorption circuit 430, where the first control unit 410 is electrically connected to the anti-jamming circuit 420 and the absorption circuit 430, respectively, the anti-jamming circuit 420 is electrically connected to the rectifying module 200, the absorption circuit 430 can keep the voltage input to the filtering module 300 below 650V, and the anti-jamming circuit 420 can reduce the electromagnetic radiation in the circuit.

Specifically, referring to fig. 3, the anti-interference circuit includes a resistor R7, a resistor R14, a resistor R15, a diode D7, a MOS transistor Q3, and a transistor Q1, one end of the resistor R7 is electrically connected to the first control unit, the other end of the resistor R7 is electrically connected to the input end of the diode D7 and the output end of the MOS transistor Q3, one end of the resistor R14 is electrically connected to the output end of the diode D7, the input end of the MOS transistor Q3, and the resistor R15, the resistor R15 is electrically connected to the input end of the transistor Q1, and the other end of the resistor R14 is electrically connected to the input end of the MOS transistor Q3 and the transistor Q1.

Referring to fig. 5, the absorption circuit includes a resistor R8, a resistor R9, a resistor R10, a resistor R11, a resistor R12, a capacitor C6, and a diode D6. The resistor R8 and the resistor R10 are connected in series to form a first part, the resistor R9 and the resistor R11 are connected in series to form a second part, the resistor R12 and the capacitor C6 are connected in series to form a third part, the first part, the second part and the third part are connected in parallel, the input end of the second part is electrically connected with the rectifying module, the output end of the second part is electrically connected with the output end of the diode D6, and the input end of the diode D6 is electrically connected with the anti-jamming circuit.

Referring to fig. 2, the sampling module 500 includes a second control unit and a sampling circuit, the sampling circuit is electrically connected to the second control unit and the filtering module 300, and the sampling module can feed back the current intensity in the filtering module 300 to the anti-interference control module 400.

Specifically, referring to fig. 6, the sampling circuit includes a resistor R16, a resistor R17, a resistor R18, a resistor R19, a resistor R20, a resistor R21, a capacitor C7, a sampling unit U3, and a third control unit. The resistor R21, the resistor R17, the resistor R18, the resistor R19 and the capacitor C7 are sequentially connected in series, the resistor R21 and the capacitor C7 are electrically connected with the third control unit, one end of the resistor R20 is electrically connected with the third control unit and the resistor R21 respectively, the other end of the resistor R20 is electrically connected with the capacitor C7, one end of the resistor R16 is electrically connected with the resistor R19, the resistor R18 and the output end of the sampling unit U3 respectively, and the other end of the resistor R16 is electrically connected with the input end of the sampling unit U3 and the filter module respectively.

Referring to fig. 2, the filtering module 300 includes a transformer circuit and a filtering circuit, the transformer circuit is electrically connected to the sampling module 500 and the filtering circuit respectively, the filtering circuit is electrically connected to the current output end 600, and the filtering module 300 can convert the ac power transmitted by the rectifying module 200 into dc power and filter the redundant ac power in the filtering module 300.

Specifically, referring to fig. 4, the filter circuit includes a resistor R24, a filter capacitor EC3, a filter capacitor EC4, and a capacitor C9. The resistor R24, the filter capacitor EC3, the filter capacitor EC4 and the capacitor C9 are connected in parallel, one end of the resistor R24 connected in parallel is electrically connected with the pin 10 on the third control unit and one pin on the current output end 600, and the other end of the resistor R24 connected in parallel is electrically connected with the pin 9 on the third control unit and the other pin on the current output end 600.

It should be noted that, preferably, the model of the control chip used by the first control unit 410 is CR6890A, the model of the control chip used by the second control unit is UP7358A, and the model of the control chip used by the third control unit is BPC 817.

The three chips all belong to the mature prior art, and do not belong to the direction to be improved by the technical scheme, so that redundant description is not repeated below.

The invention also provides a power adapter which comprises the anti-interference circuit.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.

Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.