CN219833767U

CN219833767U - Lightning protection circuit and electronic equipment

Info

Publication number: CN219833767U
Application number: CN202320613050.1U
Authority: CN
Inventors: 骆锋; 赵密; 陈熙; 王雷
Original assignee: Ecoflow Technology Ltd
Current assignee: Ecoflow Technology Ltd
Priority date: 2023-03-17
Filing date: 2023-03-17
Publication date: 2023-10-13
Anticipated expiration: 2033-03-17

Abstract

The application provides a lightning protection circuit and electronic equipment, wherein the lightning protection circuit is connected between an input interface of the electronic equipment and a rear-stage circuit of the electronic equipment. The input interface includes a positive input and a negative input. The lightning protection circuit comprises a differential mode discharge branch, a first common mode discharge branch and a second common mode discharge branch. Wherein the differential mode bleed branch and the first common mode bleed branch share at least one voltage suppression unit. Or the differential mode bleeder branch and the second common mode bleeder branch share at least one voltage suppression unit. According to the application, through reasonable design of the lightning protection circuit structure, the number of the voltage suppression units can be reduced, and the cost of the lightning protection circuit can be effectively reduced.

Description

Lightning protection circuit and electronic equipment

Technical Field

The application relates to the technical field of electronic circuits, in particular to a lightning protection circuit and electronic equipment.

Background

With the continuous development of social science and technology, electronic devices are increasingly widely applied in life, and the safety performance of the electronic devices is also increasingly focused by people. Currently, in order to cope with lightning conditions, lightning protection circuits are provided on many electronic devices in a matching manner.

However, in the related art, the design of the lightning protection circuit is unreasonable, which causes a problem of high cost of the lightning protection circuit.

It should be noted that the information disclosed in the above background section is only for enhancing understanding of the background of the utility model and thus may include information that does not form the prior art that is already known to those of ordinary skill in the art.

Disclosure of Invention

The embodiment of the utility model mainly aims to provide a lightning protection circuit and electronic equipment. The embodiment of the utility model aims to effectively reduce the cost of the lightning protection circuit by reasonably designing the structure of the lightning protection circuit.

According to an aspect of an embodiment of the present utility model, there is provided a lightning protection circuit connected between an input interface of an electronic device and a post-stage circuit of the electronic device, the input interface including a positive input terminal and a negative input terminal; the lightning protection circuit comprises a differential mode discharge branch, a first common mode discharge branch and a second common mode discharge branch;

the differential mode bleeder branch is used for being connected between the positive electrode input end and the negative electrode input end and comprises at least one voltage suppression unit and at least one overcurrent protection unit, and the voltage suppression unit and the overcurrent protection unit are connected in series;

the first common mode bleeder branch is used for being connected between the positive electrode input end and the grounding end of the electronic equipment and comprises at least one voltage suppression unit, at least one discharge unit and at least one overcurrent protection unit, wherein the voltage suppression unit, the overcurrent protection unit and the discharge unit are connected in series;

The second common mode bleeder branch is used for being connected between the negative electrode input end and the grounding end of the electronic equipment and comprises at least one voltage suppression unit, at least one discharge unit and at least one overcurrent protection unit, and the voltage suppression unit, the overcurrent protection unit and the discharge unit are connected in series;

wherein the differential mode bleed-off leg and the first common mode bleed-off leg share at least one voltage suppression unit; or the differential mode bleeder branch and the second common mode bleeder branch share at least one voltage suppression unit.

In one embodiment of the application, the differential mode bleed branch and the first common mode Lei Xiefang branch share at least one over-current protection unit; or the differential mode bleeder branch and the second common mode bleeder branch share at least one overcurrent protection unit.

In one embodiment of the application, the differential mode bleed-off branch comprises a first voltage suppression unit and a second voltage suppression unit, the differential mode bleed-off branch and the first common mode bleed-off branch sharing the first voltage suppression unit, the differential mode bleed-off branch and the second common mode bleed-off branch sharing the second voltage suppression unit.

In one embodiment of the present application, the differential mode bleeder branch comprises a first voltage suppression unit, a second voltage suppression unit, a first overcurrent protection unit, and a second overcurrent protection unit;

the first end of the first overcurrent protection unit is used for being connected with the positive electrode input end, the second end of the first overcurrent protection unit is connected with the first end of the first voltage suppression unit, the second end of the first voltage suppression unit is connected with the first end of the second voltage suppression unit, the second end of the second voltage suppression unit is connected with the first end of the second overcurrent protection unit, and the second end of the second overcurrent protection unit is used for being connected with the negative electrode input end;

the first common mode bleeder branch comprises the first overcurrent protection unit, the first voltage suppression unit, a third voltage suppression unit and a discharge unit;

the second end of the first voltage suppression unit is also connected with the first end of the third voltage suppression unit, the second end of the third voltage suppression unit is connected with the first end of the discharge unit, and the second end of the discharge unit is used for being connected with the grounding end of the electronic equipment;

the second common mode bleed-off branch comprises the second overcurrent protection unit, the second voltage suppression unit, the third voltage suppression unit and the discharge unit;

The first end of the second voltage suppression unit is also connected with the first end of the third voltage suppression unit.

In one embodiment of the present application, the differential mode bleeder branch comprises a first voltage suppression unit, a second voltage suppression unit, and a second overcurrent protection unit;

the first end of the first voltage suppression unit is used for being connected with the positive electrode input end, the second end of the first voltage suppression unit is connected with the first end of the second voltage suppression unit, the second end of the second voltage suppression unit is connected with the first end of the second overcurrent protection unit, and the second end of the second overcurrent protection unit is used for being connected with the negative electrode input end;

the first common mode bleeder branch comprises the first voltage suppression unit, a third overcurrent protection unit, a third voltage suppression unit and a discharge unit;

the second end of the first voltage suppression unit is also connected with the first end of the third overcurrent protection unit, the second end of the third overcurrent protection unit is connected with the first end of the third voltage suppression unit, the second end of the third voltage suppression unit is connected with the first end of the discharge unit, and the second end of the discharge unit is used for being connected with the grounding end of the electronic equipment;

The second common mode bleed-off branch comprises the second overcurrent protection unit, the second voltage suppression unit, the third overcurrent protection unit, the third voltage suppression unit and the discharge unit;

the first end of the second voltage suppression unit is also connected with the first end of the third overcurrent protection unit.

In one embodiment of the present application, the differential mode bleeder branch comprises a first overcurrent protection unit, a first voltage suppression unit, and a second voltage suppression unit;

the first end of the first overcurrent protection unit is used for being connected with the positive electrode input end, the second end of the first overcurrent protection unit is connected with the first end of the first voltage suppression unit, the second end of the first voltage suppression unit is connected with the first end of the second voltage suppression unit, and the second end of the second voltage suppression unit is used for being connected with the negative electrode input end;

the first common mode bleeder branch comprises the first overcurrent protection unit, the first voltage suppression unit, a third overcurrent protection unit, a third voltage suppression unit and a discharge unit;

The second common mode bleed-off branch comprises the second voltage suppression unit, the third overcurrent protection unit, the third voltage suppression unit and the discharge unit;

In one embodiment of the application, the voltage suppression unit comprises a varistor or TVS tube (TRANSIENT VOLTAGE SUPPRESSOR) transient voltage suppression diode.

In one embodiment of the application, the over-current protection unit includes a fuse or other over-current protection element.

In one embodiment of the application, the first common mode bleeder leg and the second common mode bleeder leg share a discharge unit, the discharge unit comprising a discharge vessel.

According to another aspect of an embodiment of the present application, there is provided an electronic device including the lightning protection circuit provided in any one of the embodiments above.

In one embodiment of the present application, the electronic device further includes a voltage stabilizing circuit, the voltage stabilizing circuit is connected between the positive input terminal and the negative input terminal, and the voltage stabilizing circuit is further connected to a ground terminal.

In the technical scheme provided by the embodiment of the application, the differential mode bleeder branch is used for being connected between the positive electrode input end and the negative electrode input end and comprises at least one voltage suppression unit and at least one overcurrent protection unit, and the voltage suppression unit and the overcurrent protection unit are connected in series. The first common mode bleeder branch is used for being connected between the positive electrode input end and the grounding end of the electronic equipment and comprises at least one voltage suppression unit, at least one discharge unit and at least one overcurrent protection unit, and the voltage suppression unit, the overcurrent protection unit and the discharge unit are connected in series. The second common mode bleeder branch is used for being connected between the negative electrode input end and the grounding end of the electronic equipment and comprises at least one voltage suppression unit, at least one discharge unit and at least one overcurrent protection unit, and the voltage suppression unit, the overcurrent protection unit and the discharge unit are connected in series. According to the application, one ends of the differential mode bleeder branch and the first common mode bleeder branch are connected to the positive electrode input end, and the differential mode bleeder branch and the first common mode bleeder branch share at least one voltage suppression unit, so that a cross node exists between the differential mode bleeder branch and the first common mode bleeder branch. The voltage suppression units are arranged on the cross nodes, so that the number of the voltage suppression units can be reduced; or one ends of the differential mode bleeder branch and the second common mode bleeder branch are used for being connected to the negative electrode input end, and the differential mode bleeder branch and the second common mode bleeder branch share at least one voltage suppression unit, so that a cross node exists between the differential mode bleeder branch and the second common mode bleeder branch, and the voltage suppression units are arranged on the cross node, so that the use quantity of the voltage suppression units can be reduced, and the cost of a lightning protection circuit can be effectively reduced.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art.

FIG. 1 is a schematic block diagram of one of the lightning protection circuits provided by embodiments of the application;

FIG. 2 is another schematic block diagram of a lightning protection circuit provided by an embodiment of the application;

FIG. 3 is another schematic block diagram of a lightning protection circuit provided by an embodiment of the application;

FIG. 4 is another schematic block diagram of a lightning protection circuit provided by an embodiment of the application;

FIG. 5 is a circuit diagram of one of the lightning protection circuits provided by the embodiments of the present application;

FIG. 6 is another schematic block diagram of a lightning protection circuit provided by an embodiment of the application;

FIG. 7 is a circuit diagram of one of the lightning protection circuits provided by the embodiments of the present application;

FIG. 8 is another schematic block diagram of a lightning protection circuit provided by an embodiment of the application;

FIG. 9 is a circuit diagram of one of the lightning protection circuits provided by the embodiments of the present application;

FIG. 10 is a schematic block diagram of an electronic device provided by an embodiment of the present application;

fig. 11 is a schematic block diagram of an electronic device according to an embodiment of the present application.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

It should be noted that although functional block division is performed in a device diagram and a logic sequence is shown in a flowchart, in some cases, the steps shown or described may be performed in a different order than the block division in the device, or in the flowchart. The terms first, second and the like in the description and in the claims and in the above-described figures, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of the application only and is not intended to be limiting of the application.

Lightning is a physical phenomenon which often occurs in nature, generally refers to a discharge phenomenon of a charged cloud layer to the ground, if an electronic device is struck by lightning, transient overvoltage or overcurrent can be generated in an internal circuit of the electronic device, the performance of the electronic device is affected if the electronic device is light, and the electronic device is damaged in an unrecoverable manner if the electronic device is heavy. Therefore, in designing electronic devices, lightning protection technology must be used to reduce the impact of lightning on the electronic devices.

However, in the related art, the lightning protection circuit is unreasonable in design, which causes a problem of high cost.

Based on the above, the embodiment of the application provides a lightning protection circuit which is connected between an input interface of electronic equipment and a rear-stage circuit of the electronic equipment and is used for performing lightning protection on the electronic equipment. The input interface comprises an anode input end and a cathode input end, and the lightning protection circuit comprises a differential mode discharge branch, a first common mode discharge branch and a second common mode discharge branch.

The differential mode bleeder branch is used for being connected between the positive electrode input end and the negative electrode input end and comprises at least one voltage suppression unit and at least one overcurrent protection unit, and the voltage suppression unit and the overcurrent protection unit are connected in series. The first common mode bleeder branch is used for being connected between the positive electrode input end and the grounding end of the electronic equipment and comprises at least one voltage suppression unit, at least one discharge unit and at least one overcurrent protection unit, and the voltage suppression unit, the overcurrent protection unit and the discharge unit are connected in series. The second common mode bleeder branch is used for being connected between the negative electrode input end and the grounding end of the electronic equipment and comprises at least one voltage suppression unit, at least one discharge unit and at least one overcurrent protection unit, and the voltage suppression unit, the overcurrent protection unit and the discharge unit are connected in series.

Wherein the differential mode bleeder branch and the first common mode bleeder branch share at least one voltage suppression unit; or the differential mode bleeder branch and the second common mode bleeder branch share at least one voltage suppression unit.

According to the embodiment of the application, one ends of the differential mode bleeder branch and the first common mode bleeder branch are connected to the positive electrode input end, and at least one voltage suppression unit is arranged on a path where the differential mode bleeder branch and the first common mode bleeder branch coincide, so that the differential mode bleeder branch and the first common mode bleeder branch can realize the sharing of at least one voltage suppression unit, and the number of the voltage suppression units can be reduced; or one end of the differential mode bleeder branch and one end of the second common mode bleeder branch are connected to the negative electrode input end, and at least one voltage suppression unit is arranged on the path of the superposition of the differential mode bleeder branch and the second common mode bleeder branch, so that the differential mode bleeder branch and the second common mode bleeder branch can realize the sharing of at least one voltage suppression unit, the number of the voltage suppression units can be reduced, and the cost of the lightning protection circuit can be effectively reduced.

In the embodiment of the present application, when a plurality of voltage suppressing units are included in the differential-mode bleeding branch and the first common-mode bleeding branch, at least one voltage suppressing unit may be shared. Therefore, the common at least one voltage suppressing unit is involved in both the differential mode Lei Xiefang and the common mode Lei Xiefang. Therefore, in practical application, the voltage suppression units are not required to be arranged independently of the differential-mode bleeder branch and the first common-mode bleeder branch. In the case of sharing, it is not necessary to increase the number of too many voltage suppressing units, so that costs can be saved. The same is true for the differential mode bleed branch and the second common mode bleed branch, and will not be described in detail herein.

When the voltage passing through the lightning protection circuit is large, the voltage suppression units and the overcurrent protection units in the differential mode bleeder branch, the first common mode bleeder branch and the second common mode bleeder branch can be one or a plurality of voltage suppression units and overcurrent protection units. Likewise, the discharge units in the first common-mode discharge branch and the second common-mode discharge branch may be one or a plurality of discharge units. The effect of lowest cost can be achieved under the condition that only one voltage suppressing unit, one overcurrent protecting unit and one discharging unit are used.

Embodiments of the present application are further described below.

Illustratively, referring to fig. 1, fig. 1 is a schematic block diagram of one of the lightning protection circuits provided by the embodiments of the present application. As shown in fig. 1, the lightning protection circuit 100 is connected between an input interface of an electronic device and a rear-stage circuit of the electronic device. The input interface includes a positive input hv+ and a negative input HV-. The lightning protection circuit 100 includes a differential mode bleed branch H1, a first common mode bleed branch H2, and a second common mode bleed branch H3.

The differential mode bleed branch H1 includes a first overcurrent protection unit 110, a first voltage suppression unit 120, a second voltage suppression unit 130, and a second overcurrent protection unit 140. The first end of the first overcurrent protection unit 110 is configured to be connected to the positive input terminal hv+, and the second end of the first overcurrent protection unit 110 is connected to the first end of the first voltage suppression unit 120. A second terminal of the first voltage suppressing unit 120 is connected to a first terminal of the second voltage suppressing unit 130. A second end of the second voltage suppressing unit 130 is connected to a first end of the second overcurrent protection unit 140. A second end of the second overcurrent protection unit 140 is connected to the negative input terminal HV-.

The first common mode bleed branch H2 includes a first over-current protection unit 110, a first voltage suppression unit 120, and a discharge unit 150. The second terminal of the first voltage suppression unit 120 is further connected to the first terminal of the discharge unit 150. The second terminal of the discharging unit 150 is used for being connected to the ground terminal PE of the electronic device.

The second common mode bleed branch H3 includes a second over-current protection unit 140, a second voltage suppression unit 130, and a discharge unit 150. Wherein the first terminal of the second voltage suppressing unit 130 is further connected to the first terminal of the discharging unit 150.

As shown in fig. 1, one end of the differential mode bleeder leg H1 and one end of the first common mode bleeder leg H2 are both configured to be connected to the positive input terminal hv+. Therefore, the path from the positive input terminal hv+ to the crossover node a in fig. 1 is the coincident path of the differential mode bleeder leg H1 and the first common mode bleeder leg H2. The first voltage suppressing unit 120 is disposed on the overlapping path such that the differential mode bleeding branch H1 and the first common mode bleeding branch H2 share the first voltage suppressing unit 120. One end of the differential mode bleeder branch H1 and one end of the second common mode bleeder branch H3 are both adapted to be connected to the negative input terminal HV-. Thus, the path from the negative input HV-to the crossover node a in fig. 1 is the coincident path of the differential mode bleed branch H1 and the second common mode bleed branch H3. The second voltage suppressing unit 130 is disposed on the overlapping path such that the differential mode bleeding branch H1 and the second common mode bleeding branch H3 share the second voltage suppressing unit 130.

In the embodiment of the present application, for the differential-mode discharging branch H1, the first voltage suppressing unit 120 and the second voltage suppressing unit 130 that are in common are connected in series, and the high-voltage signal input from the input interface can be divided by the first voltage suppressing unit 120 and the second voltage suppressing unit 130, and for the same high-voltage signal, two voltage suppressing units with smaller specifications can be selected, so that the suppression effect under the lightning strike condition can be achieved by selecting the voltage suppressing unit with lower cost. As for the first common-mode bleeder branch H2, since the first common-mode bleeder branch H2 and the differential-mode bleeder branch H1 share the first voltage suppressing unit 120, the number of voltage suppressing units used can be reduced. Also for the second common-mode bleeder branch H3, since the second common-mode bleeder branch H3 and the differential-mode bleeder branch H1 share the second voltage suppressing unit 130, the number of voltage suppressing units can be reduced, so that the effect of reducing the cost of the lightning protection circuit can be achieved.

Illustratively, referring to fig. 2, fig. 2 is another schematic block diagram of a lightning protection circuit provided by an embodiment of the application. Unlike the lightning protection circuit 200 shown in fig. 1, the lightning protection circuit 100 shown in fig. 2 is a case where only the first common mode bleed branch H2 and the differential mode bleed branch H1 share at least one voltage suppression unit.

As shown in fig. 2, the lightning protection circuit 200 is connected between an input interface of the electronic device and a rear-stage circuit of the electronic device. The input interface includes a positive input hv+ and a negative input HV-. The lightning protection circuit 200 includes a differential mode bleed branch H1, a first common mode bleed branch H2, and a second common mode bleed branch H3.

The differential mode bleed branch H1 includes a first over-current protection unit 210 and a first voltage suppression unit 220. The first end of the first overcurrent protection unit 210 is used for connecting the positive input terminal hv+, and the second end of the first overcurrent protection unit 210 is connected to the first end of the first voltage suppression unit 220. A second terminal of the first voltage suppression unit 220 is adapted to be connected to the negative input terminal HV-. The first common mode bleed branch H2 includes a first over-current protection unit 210, a first voltage suppression unit 220, a second over-current protection unit 230, a second voltage suppression unit 240, and a discharge unit 250. The second end of the first voltage suppression unit 220 is further connected to the first end of the second overcurrent protection unit 230. The second end of the second overcurrent protection unit 230 is connected to the first end of the second voltage suppression unit 240, and the second end of the second voltage suppression unit 240 is connected to the first end of the discharge unit 250. The second terminal of the discharging unit 250 is used for being connected to the ground terminal PE of the electronic device. The second common mode bleed branch H3 includes a second over-current protection unit 230, a second voltage suppression unit 240, and a discharge unit 250. Wherein the first end of the second overcurrent protection unit 230 is further adapted to be connected to the negative input terminal HV-.

As shown in fig. 2, one end of the differential mode bleeder leg H1 and one end of the first common mode bleeder leg H2 are both configured to be connected to the positive input terminal hv+. Therefore, the path from the positive input terminal hv+ to the crossover node a in fig. 2 is the coincident path of the differential mode bleeder leg H1 and the first common mode bleeder leg H2. The first voltage suppressing unit 220 is disposed on the overlapping path such that the differential mode bleeding branch H1 and the first common mode bleeding branch H2 share the first voltage suppressing unit 220.

In the embodiment of the present application, for the first common-mode bleeder leg H2, since the first common-mode bleeder leg H2 and the differential-mode bleeder leg H1 share the first voltage suppressing unit 220, the second voltage suppressing unit 240 is connected in series with the shared first voltage suppressing unit 220 on the first common-mode bleeder leg H2. The first voltage suppression unit 220 and the second voltage suppression unit 240 divide the high voltage signal input from the input interface, and for the same high voltage signal, two voltage suppression units with smaller specifications can be selected, so that the suppression effect under the lightning stroke condition can be achieved by selecting the voltage suppression units with lower cost. The cost of the lightning protection circuit can be reduced to a certain extent.

Illustratively, referring to fig. 3, fig. 3 is another schematic block diagram of a lightning protection circuit provided by an embodiment of the application. Unlike the lightning protection circuit 100 shown in fig. 1 and the lightning protection circuit 200 shown in fig. 2, fig. 3 is a case where only the second common-mode bleeding branch H3 and the differential-mode bleeding branch H1 share at least one voltage suppressing unit. As shown in fig. 3, the lightning protection circuit 300 is connected between an input interface of the electronic device and a rear stage circuit of the electronic device. The input interface includes a positive input hv+ and a negative input HV-. The lightning protection circuit 300 includes a differential mode bleed branch H1, a first common mode bleed branch H2, and a second common mode bleed branch H3.

The differential mode bleeder branch H1 comprises a first voltage rejection unit 310, a first over-current protection unit 320. The first end of the first voltage suppressing unit 310 is used for being connected to the positive input terminal hv+, and the second end of the first voltage suppressing unit 310 is connected to the first end of the first overcurrent protecting unit 320. A second terminal of the first overcurrent protection unit 320 is connected to the negative input terminal HV-. The first common mode bleed branch H2 includes a second over-current protection unit 330, a second voltage suppression unit 340, and a discharge unit 350. The first end of the second overcurrent protection unit 330 is used for connecting the positive input terminal hv+, and the second end of the second overcurrent protection unit 330 is connected to the first end of the second voltage suppression unit 340. The second terminal of the second voltage suppression unit 340 is connected to the first terminal of the discharge unit 350, and the second terminal of the discharge unit 350 is used for being connected to the ground terminal PE of the electronic device. The second common mode bleed branch H3 includes a first over-current protection unit 320, a first voltage suppression unit 310, a second over-current protection unit 330, a second voltage suppression unit 340, and a discharge unit 350. The first end of the first voltage suppression unit 310 is further connected to the first end of the second overcurrent protection unit 330.

As shown in fig. 3, one end of the differential mode bleeder leg H1 and one end of the second common mode bleeder leg H3 are both adapted for connection to the negative input terminal HV-. Thus, the path from the negative input HV-to the crossover node a in fig. 3 is the coincident path of the differential mode bleed branch H1 and the second common mode bleed branch H3. The first voltage suppressing unit 310 is disposed on the overlapping path such that the differential mode bleeding branch H1 and the second common mode bleeding branch H3 share the first voltage suppressing unit 310.

In the embodiment of the present application, for the second common-mode bleeder leg H3, since the second common-mode bleeder leg H3 and the differential-mode bleeder leg H1 share the first voltage suppressing unit 310, the second voltage suppressing unit 340 is connected in series with the shared first voltage suppressing unit 310 on the second common-mode bleeder leg H3. The first voltage suppressing unit 310 and the second voltage suppressing unit 340 divide the voltage of the high voltage signal input from the input interface, and for the same high voltage signal, two voltage suppressing units with smaller specifications can be selected, so that the suppression effect under the lightning strike condition can be achieved by selecting the voltage suppressing unit with lower cost. The cost of the lightning protection circuit can be reduced to a certain extent.

In one embodiment of the application, the differential mode bleed branch and the first common mode bleed branch share at least one overcurrent protection unit; or the differential mode bleeder branch and the second common mode bleeder branch share at least one overcurrent protection unit.

Specifically, referring to fig. 1, in the lightning protection circuit 100 shown in fig. 1, a first overcurrent protection unit 110 is disposed on a path between the differential mode bleeder branch H1 and the first common mode bleeder branch H2, that is, a path from the positive input terminal hv+ to the crossover node a, so that the differential mode bleeder branch H1 and the first common mode bleeder branch H2 share the first overcurrent protection unit 110. The second overcurrent protection unit 140 is disposed on the coincident path of the differential mode discharging branch H1 and the first common mode discharging branch H3, that is, the path from the negative electrode input end hv+ to the crossover node a, so that the differential mode discharging branch H1 and the second common mode discharging branch H3 share the second overcurrent protection unit 140. Referring to fig. 2, in the lightning protection circuit 200 shown in fig. 2, a first overcurrent protection unit 210 is disposed on a path between the differential mode bleeder circuit H1 and the first common mode bleeder circuit H2, that is, a path from the positive input terminal hv+ to the crossover node a, so that the differential mode bleeder circuit H1 and the first common mode bleeder circuit H2 share the first overcurrent protection unit 210. Referring to fig. 3, in the lightning protection circuit 300 shown in fig. 3, a first overcurrent protection unit 320 is disposed on a path between the differential mode bleeder circuit H1 and the first common mode bleeder circuit H3, that is, a path from the negative input end hv+ to the crossover node a, so that the differential mode bleeder circuit H1 and the second common mode bleeder circuit H3 share the first overcurrent protection unit 320.

In the embodiment of the application, through sharing the overcurrent protection units, the use quantity of the overcurrent protection units can be reduced, and the cost of the lightning protection circuit is reduced.

In one embodiment of the present application, referring to fig. 4, fig. 4 is another schematic block diagram of a lightning protection circuit provided by an embodiment of the present application. Fig. 4 is a case where the differential mode bleeder branch H1 and the first and second common mode bleeder branches H2 and H3 both share at least one voltage suppression unit and at least one overcurrent protection unit. As shown in fig. 4, the lightning protection circuit 400 is connected between an input interface of the electronic device and a rear-stage circuit of the electronic device. The input interface includes a positive input hv+ and a negative input HV-. The lightning protection circuit 400 includes a differential mode bleed branch H1, a first common mode bleed branch H2, and a second common mode bleed branch H3.

The differential mode bleed branch H1 includes a first over-current protection unit 410, a first voltage suppression unit 420, a second voltage suppression unit 430, and a second over-current protection unit 440. The first end of the first overcurrent protection unit 410 is used for being connected to the positive input terminal hv+, and the second end of the first overcurrent protection unit 410 is connected to the first end of the first voltage suppression unit 420. The second terminal of the first voltage suppressing unit 420 is connected to the first terminal of the second voltage suppressing unit 430, and the second terminal of the second voltage suppressing unit 430 is connected to the first terminal of the second overcurrent protection unit 440. A second terminal of the second overcurrent protection unit 440 is connected to the negative input terminal. The first common mode bleed branch H2 includes a first over-current protection unit 410, a first voltage suppression unit 420, a third voltage suppression unit 450, and a discharge unit 460. The second end of the first voltage suppressing unit 420 is further connected to the first end of the third voltage suppressing unit 450, and the second end of the third voltage suppressing unit 450 is connected to the first end of the discharging unit 460. The second terminal of the discharging unit 460 is used for connecting to the ground terminal of the electronic device. The second common mode bleed branch includes a second over-current protection unit 440, a second voltage suppression unit 430, a third voltage suppression unit 450, and a discharge unit 460. Wherein the first end of the second voltage suppressing unit 430 is further connected to the first end of the third voltage suppressing unit 450.

As shown in fig. 4, one end of the differential mode bleeder leg H1 and one end of the first common mode bleeder leg H2 are both configured to be connected to the positive input terminal hv+. Therefore, the path from the positive input terminal hv+ to the crossover node a in fig. 4 is the coincident path of the differential mode bleeder leg H1 and the first common mode bleeder leg H2. The first overcurrent protection unit 410 and the first voltage suppression unit 420 are disposed on the overlapping path such that the differential mode bleed branch H1 and the first common mode bleed branch H2 share the first overcurrent protection unit 410 and the first voltage suppression unit 420. One end of the differential mode bleeder branch H1 and one end of the second common mode bleeder branch H3 are both adapted to be connected to the negative input terminal HV-. Thus, the path from the negative input HV-to the crossover node a in fig. 4 is the coincident path of the differential mode bleed branch H1 and the second common mode bleed branch H3. The second voltage suppressing unit 430 and the second overcurrent protection unit 440 are disposed on the overlapping path such that the differential mode bleeding leg H1 and the second common mode bleeding leg H3 share the second voltage suppressing unit 430 and the second overcurrent protection unit 440.

In the embodiment of the present application, for the differential-mode discharging branch H1, the first voltage suppressing unit 420 and the second voltage suppressing unit 430 that are in common are connected in series, and voltage division can be performed by the first voltage suppressing unit 420 and the second voltage suppressing unit 430, and for the same high-voltage signal, two voltage suppressing units with smaller specifications can be selected, so that the suppression effect under the lightning strike condition can be achieved by selecting the voltage suppressing unit with lower cost. In the first common-mode bleeder circuit H2, since the first common-mode bleeder circuit H2 and the differential-mode bleeder circuit H1 share the first voltage suppressing unit 420, the third voltage suppressing unit 450 is connected in series with the shared first voltage suppressing unit 420 on the first common-mode bleeder circuit H2. By dividing the voltage by the first voltage suppressing unit 420 and the third voltage suppressing unit 450, two voltage suppressing units with smaller specifications can be selected for the same high voltage signal, so that the suppression effect under the lightning strike condition can be achieved by selecting a voltage suppressing unit with lower cost. Meanwhile, since the first common mode bleed branch H2 and the differential mode bleed branch H1 share the first overcurrent protection unit 410, the number of the overcurrent protection units can be reduced. For the second common-mode bleeder circuit H3, since the second common-mode bleeder leg H3 and the differential-mode bleeder leg H1 share the second voltage suppressing unit 430, the third voltage suppressing unit 450 is connected in series with the shared second voltage suppressing unit 430 on the second common-mode bleeder leg H3. By dividing the voltage by the second voltage suppressing unit 430 and the third voltage suppressing unit 450, two voltage suppressing units with smaller specifications can be selected for the same high voltage signal, so that the suppression effect under the lightning strike condition can be achieved by selecting a voltage suppressing unit with lower cost. Meanwhile, since the second common-mode bleed-off branch H3 and the differential-mode bleed-off branch H1 share the second overcurrent protection unit 440, the number of the overcurrent protection units can be reduced.

Referring to fig. 5, fig. 5 is a circuit diagram of one of the lightning protection circuits according to the embodiment of the present application, and is a circuit diagram corresponding to the lightning protection circuit 400 shown in fig. 4. As shown in fig. 5, the voltage suppressing unit may be a varistor, the overcurrent protecting unit may be a fuse, and the discharging unit may be a discharge tube. In fig. 5, the positive input hv+, fuse F1, varistor MOV2, fuse F2 and negative input HV-form a loop that is a differential-mode bleed-off branch H1. The circuit formed by the positive input end HV+, the fuse F1, the piezoresistor MOV3, the discharge tube GSC1 and the grounding end PE of the electronic equipment is a first common mode bleeder branch H2. The loop formed by the negative input end HV-, the fuse F2, the piezoresistor MOV3, the discharge tube GSC1 and the grounding end PE of the electronic equipment is a second common mode bleeder branch H3.

In the embodiment of the application, by reasonably designing the structure of the lightning protection circuit, the differential mode bleeder circuit H1, the first common mode bleeder circuit H2 and the second common mode bleeder circuit H3 all comprise two piezoresistors which are connected in series, the two piezoresistors can divide voltage, and for the same high-voltage signal, two piezoresistors with smaller specifications can be selected. In the mode selection of the piezoresistor, the piezoresistor with lower cost and lower withstand voltage performance can achieve the same inhibition effect under the lightning stroke condition. For example, for a high voltage of 1200V, if the differential-mode bleeder circuit H1, the first common-mode bleeder circuit H2, and the second common-mode bleeder circuit H3 each include only one varistor, the varistor selected for each bleeder circuit needs to be capable of withstanding the high voltage of 1200V, which is costly. By designing the lightning protection circuit according to the embodiment of the application, the differential mode bleeder branch H1, the first common mode bleeder branch H2 and the second common mode bleeder branch H3 all comprise two piezoresistors which are connected in series, and under the high voltage of 1200V, the piezoresistors selected by each bleeder branch only need to bear the high voltage of 600V, so that the same inhibition effect can be achieved by selecting the piezoresistors with lower cost while the number of the piezoresistors is not increased, and the cost of the lightning protection circuit can be reduced. Meanwhile, in order to protect the circuit by the opening of the fuse when the varistor fails. The embodiment of the application designs the fuse to be shared, namely, each piezoresistor is not required to be configured with one fuse, so that the number of fuses can be saved, and the cost is reduced.

It should be noted that, in the embodiment of the present application, the piezoresistor in fig. 5 is replaced by a TVS tube, which can achieve the same effect. That is, the voltage suppression unit may be a varistor or a TVS tube.

In one embodiment of the present application, referring to fig. 6, fig. 6 is another schematic block diagram of a lightning protection circuit provided by an embodiment of the present application. Unlike the lightning protection circuit 400 shown in fig. 4, fig. 6 is a case where the differential mode bleed branch H1 and the first common mode bleed branch H2 do not share an overcurrent protection unit. As shown in fig. 6, the lightning protection circuit 600 is connected between an input interface of the electronic device and a rear-stage circuit of the electronic device. The input interface includes a positive input hv+ and a negative input HV-. The lightning protection circuit 600 includes a differential mode bleed branch H1, a first common mode bleed branch H2, and a second common mode bleed branch H3.

The differential mode bleed branch H1 includes a first voltage suppression unit 610, a second voltage suppression unit 620, and a second over-current protection unit 630. The first end of the first voltage suppressing unit 610 is used for being connected to the positive input terminal hv+, and the second end of the first voltage suppressing unit 610 is connected to the first end of the second voltage suppressing unit 620. A second terminal of the second voltage suppression unit 620 is connected to a first terminal of the second overcurrent protection unit 630, and a second terminal of the second overcurrent protection unit 630 is connected to the negative input terminal HV-. The first common mode bleed branch H2 includes a first voltage suppression unit 610, a third over-current protection unit 640, a third voltage suppression unit 650, and a discharge unit 660. The second end of the first voltage suppression unit 610 is further connected to the first end of the third overcurrent protection unit 640, and the second end of the third overcurrent protection unit 640 is connected to the first end of the third voltage suppression unit 650. The second end of the third voltage suppressing unit 650 is connected to the first end of the discharging unit 660, and the second end of the discharging unit 660 is connected to the ground terminal PE of the electronic device. The second common mode bleed branch H3 includes a second overcurrent protection unit 630, a second voltage suppression unit 620, a third overcurrent protection unit 640, a third voltage suppression unit 650, and a discharge unit 660. The first end of the second voltage suppression unit 620 is further connected to the first end of the third overcurrent protection unit 640.

As shown in fig. 6, one end of the differential mode bleeder leg H1 and one end of the first common mode bleeder leg H2 are both configured to be connected to the positive input terminal hv+. Therefore, the path from the positive input terminal hv+ to the crossover node a in fig. 6 is the coincident path of the differential mode bleeder leg H1 and the first common mode bleeder leg H2. The first voltage suppressing unit 610 is disposed on the overlapping path such that the differential mode bleeding branch H1 and the first common mode bleeding branch H2 share the first voltage suppressing unit 610. One end of the differential mode bleeder branch H1 and one end of the second common mode bleeder branch H3 are both adapted to be connected to the negative input terminal HV-. Thus, the path from the negative input HV-to the crossover node a in fig. 6 is the coincident path of the differential mode bleed branch H1 and the second common mode bleed branch H3. The second voltage suppressing unit 620 and the second overcurrent protection unit 630 are disposed on the overlapping path such that the differential mode bleed-off leg H1 and the second common mode bleed-off leg H3 share the second voltage suppressing unit 620 and the second overcurrent protection unit 630.

In the embodiment of the present application, in the differential-mode discharging branch H1, the first voltage suppressing unit 610 and the second voltage suppressing unit 620 that are in common are connected in series, and voltage division can be performed by the first voltage suppressing unit 610 and the second voltage suppressing unit 620, and for the same high-voltage signal, two voltage suppressing units with smaller specifications can be selected, so that the suppression effect under the lightning strike condition can be achieved by selecting the voltage suppressing unit with lower cost. For the first common mode bleeder circuit H2, since the first common mode bleeder circuit H2 and the differential mode bleeder circuit H1 share the first voltage suppressing unit 610, the third voltage suppressing unit 650 is connected in series with the shared first voltage suppressing unit 610 in the first common mode bleeder circuit H2. By dividing the voltage by the first voltage suppressing unit 610 and the third voltage suppressing unit 650, two voltage suppressing units with smaller specifications can be selected for the same high voltage signal, so that the suppression effect under the lightning strike condition can be achieved by selecting a voltage suppressing unit with lower cost. As for the second common-mode bleeder circuit H3, since the second common-mode bleeder circuit H3 shares the second voltage suppressing unit 620 with the differential-mode bleeder circuit H1, in the second common-mode bleeder circuit H3, the third voltage suppressing unit 650 is connected in series with the shared second voltage suppressing unit 620. By dividing the voltage by the second voltage suppressing unit 620 and the third voltage suppressing unit 650, two voltage suppressing units with smaller specifications can be selected for the same high voltage signal, so that the suppression effect under the lightning strike condition can be achieved by selecting a voltage suppressing unit with lower cost. Meanwhile, the second common-mode bleeder circuit H3 and the differential-mode bleeder branch H1 share the second overcurrent protection unit 630, so that the number of the overcurrent protection units can be reduced, and the effect of reducing the cost of the lightning protection circuit is achieved.

Referring to fig. 7, fig. 7 is a circuit diagram of one of the lightning protection circuits according to the embodiment of the present application, and is a circuit diagram corresponding to the lightning protection circuit 600 shown in fig. 6. As shown in fig. 7, the voltage suppressing unit may be a varistor, the overcurrent protecting unit may be a fuse, and the discharging unit may be a discharge tube. In fig. 7, the circuit formed by the positive input hv+, the varistor MOV1, the varistor MOV2, the fuse F2 and the negative input HV-is the differential-mode bleeder branch H1. The circuit formed by the positive electrode input end HV+, the piezoresistor MOV1, the fuse F3, the piezoresistor MOV3, the discharge tube GSC1 and the grounding end PE of the electronic equipment is a first common mode bleeder branch H2. The loop formed by the negative electrode input end HV-, the fuse F2, the piezoresistor MOV2, the fuse F3, the piezoresistor MOV3, the discharge tube GSC1 and the grounding end PE of the electronic equipment is a second common mode bleeder branch H3.

In the same way, in the embodiment of the present application, as shown in fig. 7, by reasonably designing the structure of the lightning protection circuit, the differential mode bleeder circuit H1, the first common mode bleeder circuit H2 and the second common mode bleeder circuit H3 all include two piezoresistors connected in series with each other. The two piezoresistors can be divided, and for the same high-voltage signal, two piezoresistors with smaller specifications can be selected. The voltage dependent resistor with lower cost can be selected to achieve the same inhibition effect without increasing the number of the voltage dependent resistors, and the cost of the lightning protection circuit can be reduced. Meanwhile, the differential mode bleeder circuit H1 and the second common mode bleeder circuit H3 are designed to share one fuse F2, so that the number of fuses can be saved, and the cost is reduced.

In fig. 7, the fuse F3 is not shared, but is a fuse on the first common-mode bleeder branch H2, and thus the fuse F3 may be disposed on the left or right of the varistor MOV3 and connected in series with the varistor MOV 3. Fig. 7 in the embodiment of the present application shows only one possible connection.

In one embodiment of the present application, referring to fig. 8, fig. 8 is another schematic block diagram of a lightning protection circuit provided by an embodiment of the present application. Unlike the lightning protection circuit 400 shown in fig. 4 and the lightning protection circuit 600 shown in fig. 6, fig. 8 is a case where the differential mode bleed branch H1 and the first common mode bleed branch H2 share at least one overcurrent protection unit. As shown in fig. 8, the lightning protection circuit 800 is connected between an input interface of the electronic device and a rear-stage circuit of the electronic device. The input interface includes a positive input hv+ and a negative input HV-. The lightning protection circuit 800 includes a differential mode bleed branch H1, a first common mode bleed branch H2, and a second common mode bleed branch H3.

The differential mode bleed branch H1 includes a first over-current protection unit 810, a first voltage suppression unit 820, and a second voltage suppression unit 830. A first end of the first overcurrent protection unit 810 is connected to the positive input terminal hv+, and a second end of the first overcurrent protection unit 810 is connected to a first end of the first voltage suppression unit 820. A second terminal of the first voltage suppressing unit 820 is connected to a first terminal of the second voltage suppressing unit 830, and a second terminal of the second voltage suppressing unit 830 is connected to the negative input terminal HV-. The first common mode bleed branch H2 includes a first over-current protection unit 810, a first voltage suppression unit 820, a third over-current protection unit 840, a third voltage suppression unit 850, and a discharge unit 860. The second end of the first voltage suppression unit 820 is further connected to the first end of the third overcurrent protection unit 840. The second end of the third over-current protection is connected to the first end of the third voltage suppression unit 850, and the second end of the third voltage suppression unit 850 is connected to the first end of the discharge unit 860. A second terminal of the discharge unit 860 is for connecting to a ground terminal of the electronic device. The second common mode bleed branch includes a second voltage suppression unit 830, a third over-current protection unit 840, a third voltage suppression unit 850, and a discharge unit 860. The first end of the second voltage suppression unit 830 is further connected to the first end of the third overcurrent protection unit 840.

As shown in fig. 8, one end of the differential mode bleeder leg H1 and one end of the first common mode bleeder leg H2 are both configured to be connected to the positive input terminal hv+. Therefore, the path from the positive input terminal hv+ to the crossover node a in fig. 8 is the coincident path of the differential mode bleed branch H1 and the first common mode bleed branch H2. The first voltage suppressing unit 810 and the first overcurrent protection unit 820 are disposed on the overlapping path such that the differential mode bleed-off branch H1 and the first common mode bleed-off branch H2 share the first voltage suppressing unit 810 and the first overcurrent protection unit 820. One end of the differential mode bleeder branch H1 and one end of the second common mode bleeder branch H3 are both adapted to be connected to the negative input terminal HV-. Thus, the path from the negative input HV-to the crossover node a in fig. 8 is the coincident path of the differential mode bleed branch H1 and the second common mode bleed branch H3. The second voltage suppressing unit 830 is disposed on the overlapping path such that the differential mode bleeding branch H1 and the second common mode bleeding branch H3 share the second voltage suppressing unit 830.

In the embodiment of the present application, in the differential-mode discharging branch H1, the first voltage suppressing unit 820 and the second voltage suppressing unit 830 that are in common are connected in series, and voltage division can be performed by the first voltage suppressing unit 820 and the second voltage suppressing unit 830, and for the same high-voltage signal, two voltage suppressing units with smaller specifications can be selected, so that the suppression effect under the lightning strike condition can be achieved by selecting the voltage suppressing unit with lower cost. For the first common mode bleeder circuit H2, since the first common mode bleeder circuit H2 shares the first voltage suppressing unit 810 with the differential mode bleeder circuit H1, the third voltage suppressing unit 850 is connected in series with the shared first voltage suppressing unit 820 in the first common mode bleeder circuit H2. By dividing the voltage by the first voltage suppressing unit 820 and the third voltage suppressing unit 850, two voltage suppressing units with smaller specifications can be selected for the same high voltage signal, so that the suppression effect under the lightning strike condition can be achieved by selecting a voltage suppressing unit with lower cost. Meanwhile, the first common-mode bleeder circuit H2 and the differential-mode bleeder branch H1 share the first overcurrent protection unit 820, so that the number of the overcurrent protection units can be reduced, and the effect of reducing the cost of the lightning protection circuit is achieved. As for the second common-mode bleeder circuit H3, since the second common-mode bleeder circuit H3 shares the second voltage suppressing unit 830 with the differential-mode bleeder circuit H1, in the second common-mode bleeder circuit H3, the third voltage suppressing unit 850 is connected in series with the shared second voltage suppressing unit 830. By dividing the voltage by the second voltage suppressing unit 830 and the third voltage suppressing unit 850, two voltage suppressing units with smaller specifications can be selected for the same high voltage signal, so that the suppression effect under the lightning strike condition can be achieved by selecting a voltage suppressing unit with lower cost.

Referring to fig. 9, fig. 9 is a circuit diagram of one of the lightning protection circuits according to the embodiment of the present application, and is a circuit diagram corresponding to the lightning protection circuit shown in fig. 8. As shown in fig. 9, the voltage suppressing unit may be a varistor, the overcurrent protecting unit may be a fuse, and the discharging unit may be a discharge tube. In fig. 8, the circuit formed by the positive input hv+, fuse F1, varistor MOV2 and negative input HV-is a differential-mode bleed-off branch H1. The circuit formed by the positive electrode input end HV+, the piezoresistor MOV1, the fuse F3, the piezoresistor MOV3, the discharge tube GSC1 and the grounding end PE of the electronic equipment is a first common mode bleeder branch H2. The loop formed by the negative electrode input end HV-, the piezoresistor MOV2, the fuse F3, the piezoresistor MOV3, the discharge tube GSC1 and the grounding end PE of the electronic equipment is a second common mode bleeder branch H3.

In the same way, in the embodiment of the present application, as shown in fig. 9, by reasonably designing the structure of the lightning protection circuit, the differential mode bleeder circuit H1, the first common mode bleeder circuit H2 and the second common mode bleeder circuit H3 all include two piezoresistors connected in series, the two piezoresistors can be used for voltage division, and for the same high voltage signal, two piezoresistors with smaller specifications can be selected. The voltage dependent resistor with lower cost can be selected to achieve the same inhibition effect without increasing the number of the voltage dependent resistors, and the cost of the lightning protection circuit can be reduced. Meanwhile, the first common-mode discharging branch H2 and the second common-mode discharging branch H3 are designed to share the same fuse F3, so that the number of fuses can be saved, and the cost is reduced.

In one embodiment of the present application, the negative input terminal may be connected to the ground terminal of the electronic device, where only one overcurrent protection unit is required to be reserved on the differential mode bleeder circuit, the first common mode bleeder circuit, or the second common mode bleeder circuit. The number of the overcurrent protection units can be reduced, and the cost is reduced.

For example, when the voltage does not exceed 36V, the negative input terminal and the ground terminal of the electronic device may be connected, and at this time, only one overcurrent protection unit is required to be disposed in the lightning protection circuit, so that the effect of reducing the cost may be achieved.

In one embodiment of the application, the voltage suppression unit comprises a varistor or TVS tube and the over-current protection unit comprises a fuse.

In the embodiment of the application, the voltage suppression unit can be a piezoresistor or a TVS tube. If the piezoresistor is selected, the protective tube is immediately burnt when the high current is struck by lightning and is short-circuited through the piezoresistor, so that the purpose of protecting the circuit is achieved. Meanwhile, when overvoltage occurs, the piezoresistor is broken down to present a short circuit state, so that the voltage at two ends of the piezoresistor is clamped at a lower level, and meanwhile, the overcurrent caused by the short circuit burns out a front protective tube or forces an air switch to trip, so that the power supply is forcibly cut off, and the overvoltage protection can be realized. If the voltage suppression unit adopts a TVS tube, when a large current is struck by lightning, the working impedance of the voltage suppression unit can be immediately reduced to a very low conducting value, the large current is allowed to pass, and the voltage is clamped to a preset level, so that the voltage suppression unit can play a role of protecting a circuit.

In the embodiment of the application, the overcurrent protection unit can be a fuse. When the voltage suppression unit fails, for example, when the piezoresistor fails, the fuse can be disconnected due to the overcurrent effect, so that the overcurrent protection effect is achieved, the electronic equipment can be protected from being damaged by current, and serious damage caused by internal faults of the electronic equipment can be avoided.

In one embodiment of the application, the first common mode bleeder leg and the second common mode bleeder leg share a discharge unit comprising a discharge vessel.

In the embodiment of the application, the discharge unit can be a discharge tube, and when lightning is struck, the discharge tube can discharge lightning surge current induced in a circuit to the ground, and meanwhile, the surge voltage at the end of a protected device can be clamped under a safe voltage.

According to the embodiment of the application, the first common-mode discharging branch and the second common-mode discharging branch are shared by the discharging units, namely, the discharging units are arranged on the branches where the first common-mode discharging branch and the second common-mode discharging branch coincide, so that the sharing of the discharging units is realized, the number of the discharging units in a circuit can be reduced, and the circuit cost is reduced.

Referring to fig. 10, an embodiment of the present application further provides an electronic device, including the lightning protection circuit 110 provided in any of the embodiments of the present application.

Because the electronic device 100 provided by the embodiment of the application includes the lightning protection circuit 110 provided by any embodiment of the application, the electronic device of the application can have a better lightning protection effect, and meanwhile, the cost is lower, which is beneficial to protecting the safety of the electronic device.

Referring to fig. 11, the electronic device of the present application further includes a voltage stabilizing circuit 120. Wherein the voltage stabilizing circuit 120 is connected between the positive input terminal hv+ and said negative input terminal HV-. The lightning protection circuit 110 is connected between the input interface J5 and the post-stage circuit L2. The post-stage circuit L2 may be a transformer or the like.

Referring to fig. 11, in order to ensure stability of the output voltage, a voltage stabilizing circuit 120 is connected between the positive input terminal hv+ and the negative input terminal HV-, and the voltage stabilizing circuit 120 includes a first capacitor C1 and a second capacitor C2. The first end of the first capacitor C1 is connected to the positive input terminal hv+, and the second end of the first capacitor C1 is connected to the first end of the second capacitor C2. The second terminal of the second capacitor C is connected to the negative input terminal HV-. The ground terminal PE of the electronic device is further connected between the second terminal of the first capacitor C1 and the first terminal of the second capacitor C2.

According to the embodiment of the application, the first capacitor C1 and the second capacitor C2 are connected between the positive electrode input end HV+ and the negative electrode input end HV-, when the voltage is alternating, the voltage at the two ends cannot be suddenly changed due to the voltage stabilizing effect of the capacitors, so that stable input of the voltage can be ensured, and the input voltage is more stable when the electronic equipment is normally used.

In one embodiment of the present application, the electronic device of the present application further includes a post-stage circuit, which may be an inverter module, a rectifier module, or other modules.

In one embodiment of the application, the back-end circuit may also be connected to a battery pack, which may be charged with electrical energy from the input interface.

Because the electronic device 100 provided in the embodiment of the present application includes the lightning protection circuit 110 provided in any embodiment of the present application, the technical effects similar to those of the lightning protection circuit 110 can be achieved, and the detailed description is omitted herein.

Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains.

It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.

Claims

1. The lightning protection circuit is characterized by being connected between an input interface of electronic equipment and a post-stage circuit of the electronic equipment, wherein the input interface comprises a positive electrode input end and a negative electrode input end; the lightning protection circuit comprises a differential mode discharge branch, a first common mode discharge branch and a second common mode discharge branch;

2. The lightning protection circuit of claim 1, wherein the differential mode bleed branch and the first common mode bleed branch share at least one overcurrent protection unit; or the differential mode bleeder branch and the second common mode bleeder branch share at least one overcurrent protection unit.

3. The lightning protection circuit of claim 1, wherein the differential mode bleed-off leg comprises a first voltage suppression unit and a second voltage suppression unit, the differential mode bleed-off leg and the first common mode bleed-off leg sharing the first voltage suppression unit, the differential mode bleed-off leg and the second common mode bleed-off leg sharing the second voltage suppression unit.

4. The lightning protection circuit according to claim 3 wherein:

the differential mode bleeder branch also comprises a first overcurrent protection unit and a second overcurrent protection unit;

5. The lightning protection circuit of claim 1, wherein:

the differential mode bleeder branch comprises a first voltage suppression unit, a second voltage suppression unit and a second overcurrent protection unit;

6. The lightning protection circuit of claim 1, wherein:

the differential mode bleeder branch comprises a first overcurrent protection unit, a first voltage suppression unit and a second voltage suppression unit;

7. The lightning protection circuit according to any one of claims 1 to 6 wherein the voltage suppression unit comprises a varistor or TVS tube and the over-current protection unit comprises a fuse or other over-current protection element.

8. The lightning protection circuit according to any one of claims 1 to 6 wherein the first common mode bleed branch and the second common mode bleed branch share a discharge unit, the discharge unit comprising a discharge tube.

9. An electronic device comprising the lightning protection circuit of any one of claims 1-8.

10. The electronic device of claim 9, further comprising a voltage regulator circuit connected between the positive input terminal and the negative input terminal, the voltage regulator circuit further connected to a ground terminal.