CN220895418U - New energy electric vehicle and intelligent fuse circuit thereof - Google Patents

Abstract

The utility model discloses a new energy electric vehicle and an intelligent fuse circuit, wherein the intelligent fuse circuit comprises a contactor, a switch module, a first triode, a first voltage stabilizing tube and a controller, the contactor comprises a contact switch and an electromagnetic coil, the contact switch comprises a first static contact piece, a second static contact piece and a movable contact piece, the electromagnetic coil comprises a first iron core, a second iron core, a coil framework, a connecting rod and a coil winding.

Description

New energy electric vehicle and intelligent fuse circuit thereof

Technical Field

The utility model relates to the technical field of new energy electric vehicles, in particular to a new energy electric vehicle and an intelligent fuse circuit thereof.

Background

The fuse plays an overload protection role in the circuit, and when the current abnormally rises to a certain value and heat, the current is cut off through self-fusing, so that the circuit is protected to safely run. There are also many fuses in new energy automobiles to ensure driving safety, but fuses have many disadvantages. The fuse melting current value is proportional to the melting time, and the larger the current is, the faster the melting is, and the smaller the current is, the slower the melting is. For a new energy automobile, the contact of the relay is easy to adhere due to slow fusing, and components are easier to damage; the fast fusing requires a great current, and the great current burns out the load, and the two cases have great potential safety hazards. In addition, the fuse cannot be recovered after being blown, normal running is affected, and potential safety hazards exist.

Disclosure of utility model

The embodiment of the utility model provides a new energy electric vehicle and an intelligent fuse circuit thereof, which are used for solving the problems that in the prior art, when the new energy electric vehicle is in overcurrent or short circuit, a fuse cannot be rapidly disconnected or cannot be recovered, so that the new energy electric vehicle has potential safety hazard in running or cannot run.

An embodiment of the present utility model provides an intelligent fuse circuit of a new energy electric vehicle, where the intelligent fuse circuit includes:

The contactor comprises a contact switch and an electromagnetic coil, wherein the contact switch comprises a movable contact piece, a first static contact piece and a second static contact piece which are arranged at intervals, the electromagnetic coil comprises a first iron core, a second iron core, a coil framework, a connecting rod and a coil winding, the coil framework is fixed inside the second iron core, the coil winding is wound on the coil framework, one end of the connecting rod is connected with the first iron core, the connecting rod penetrates through the second iron core and the coil framework, the other end of the connecting rod is connected with the movable contact piece, the first static contact piece is connected with an input module, and the second static contact piece is connected with an output module;

The input end of the switch module is connected with the power supply module, and the output end of the switch module is connected with the first end of the coil winding;

The collector of the first triode is connected with the second end of the coil winding, and the emitter of the first triode is connected with the ground;

The cathode end of the first voltage stabilizing tube is connected with the second end of the coil winding, and the anode end of the first voltage stabilizing tube is connected with the base electrode of the first triode;

And a first output end of the controller is connected with a control end of the switch module, and a second output end of the controller is connected with a grid electrode of the first triode.

Preferably, the coil skeleton includes first platform portion, second platform portion and winding portion, first platform portion contact the internal surface of the first end of second iron core, the one end of winding portion with first platform portion fixed connection, and pass first platform portion with the first end of second iron core, the other end of winding portion with second platform portion fixed connection, and pass second platform portion with the second end of second iron core, coil winding is twined on the winding portion.

Preferably, an elastic piece is arranged between the movable contact piece and the winding part, and the elastic piece is sleeved on the connecting rod.

Preferably, a first contact is arranged on the first surface of the first static contact piece, a second contact is arranged on the first surface of the second static contact piece, a third contact and a fourth contact are arranged on the first surface of the movable contact piece, the first contact and the third contact are oppositely arranged, and the second contact and the fourth contact are oppositely arranged.

Preferably, the switch module is a MOS transistor, a source of the MOS transistor is an input end of the switch module, a drain of the MOS transistor is an output end of the switch module, and a gate of the MOS transistor is a control end of the switch module.

Preferably, the intelligent fuse circuit further comprises:

And the current detection module is arranged adjacent to the contact switch, and the first output end of the current detection module is connected with the first input end of the controller.

The intelligent fuse circuit further comprises:

The communication module is connected with the controller, and the controller receives external instructions through the communication module.

Preferably, the intelligent fuse circuit further includes a diode D1 and a resistor R1, an anode of the diode D1 is connected to the second output end of the controller, a cathode of the diode D1 is connected to the first end of the resistor R1, and a second end of the resistor R1 is connected to the gate of the first triode.

Preferably, the intelligent fuse circuit further comprises a resistor R2, a resistor R3, a resistor R4, a voltage stabilizing tube D3, a triode Q2 and a capacitor C1, wherein the second output end of the current detection module is connected with the cathode of the voltage stabilizing tube D3, the anode of the voltage stabilizing tube D3 is connected with the first end of the resistor R4 and the first end of the capacitor C1, the second end of the capacitor C1 is connected with the ground, the second end of the resistor R4 is connected with the base of the triode Q2, the emitter of the triode Q2 is connected with the ground, the collector of the triode Q2 is respectively connected with the first end of the resistor R2 and the first end of the resistor R3, the second end of the resistor R2 is connected with the second output end of the controller, and the second end of the resistor R3 is connected with the second input end of the controller.

A second aspect of the embodiment of the present utility model provides a new energy electric vehicle, including the intelligent fuse circuit provided in the first aspect.

The technical effects of the embodiment of the utility model are as follows: according to the technical scheme, the first static contact piece, the second static contact piece, the movable contact piece, the first iron core, the second iron core, the coil framework, the connecting rod and the coil winding are arranged on the mechanical structure, when the coil winding is electrified, the first iron core drives the movable contact piece to move towards the first static contact piece and the second static contact piece, the first static contact piece and the second static contact piece are in contact conduction with the movable contact piece, when the coil winding flows through a large current, the first iron core drives the movable contact piece to be quickly away from the first static contact piece and the second static contact piece, the contact between the first static contact piece and the second static contact piece and the movable contact piece can be quickly disconnected when short circuit or large current is realized, the first iron core and the second static contact piece are not adhered together, and the safety of a new energy electric vehicle is improved. Meanwhile, one end of the electromagnetic coil in the contactor is connected with the first voltage stabilizing tube and the first triode in the circuit structure, when the contactor is in a high-current working state, the energy stored by the electromagnetic coil can be guided to the ground through the first voltage stabilizing tube and the first triode, so that the problem that the contact switch is bonded and cannot be disconnected under high current is effectively avoided, the purpose of high-efficiency and quick disconnection is achieved, and the running safety of the new energy electric vehicle is improved. And through the stability control of the first voltage stabilizing tube, the energy stored by the electromagnetic coil can not generate excessive voltage in the process of guiding the ground, and the risk of equipment damage is avoided.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the description of the embodiments of the present utility model will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an intelligent fuse circuit of a new energy electric vehicle according to an embodiment of the present utility model;

Fig. 2 is a schematic structural diagram of a contactor in an intelligent fuse circuit of a new energy electric vehicle according to an embodiment of the present utility model;

Fig. 3 is a schematic diagram of a current flow of an intelligent fuse circuit of a new energy electric vehicle according to an embodiment of the present utility model;

fig. 4 is another schematic structural diagram of an intelligent fuse circuit of a new energy electric vehicle according to the first embodiment of the present utility model;

fig. 5 is a circuit diagram of an example one of an intelligent fuse circuit of a new energy electric vehicle according to the first embodiment of the present utility model;

fig. 6 is a schematic diagram of a current flow of an example one of an intelligent fuse circuit of a new energy electric vehicle according to the first embodiment of the present utility model;

Fig. 7 is another circuit diagram of an intelligent fuse circuit of a new energy electric vehicle according to the first embodiment of the present utility model;

In the figure: 10. a contactor; 20. an input module; 30. an output module; 40. a power module; 50. a first triode; 60. a first voltage stabilizing tube; 70. a controller; 80. a switch module; 90. a current detection module; 101. a contact switch; 102. an electromagnetic coil; 200. a first stationary contact; 201. a second stationary contact; 202. a movable contact piece; 203. a connecting rod; 204. a second iron core; 205. a first iron core; 206. a coil winding; 207. a first platform part; 208. a second platform section; 209. a winding part; 211. a first contact; 212. a second contact; 213. a third contact; 214. a fourth contact; 215. a first surface of the second core; 216. a second surface of the second core; 217. a first surface of the first core; 218. a second surface of the first core.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

It should be understood that the present utility model may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art. In the drawings, the dimensions and relative dimensions of layers and regions may be exaggerated for the same elements throughout for clarity.

It will be understood that when an element or layer is referred to as being "on" …, "" adjacent to "…," "connected to" or "coupled to" another element or layer, it can be directly on, adjacent to, connected to or coupled to the other element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being "directly on" …, "" directly adjacent to "…," "directly connected to" or "directly coupled to" another element or layer, there are no intervening elements or layers present. It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or section from another element, component, region, layer or section. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the present utility model.

Spatially relative terms, such as "under …," "under …," "below," "under …," "over …," "above," and the like, may be used herein for ease of description to describe one element or feature's relationship to another element or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use and operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements or features described as "under" or "beneath" other elements would then be oriented "on" the other elements or features. Thus, the exemplary terms "below …" and "under …" may include both an upper and a lower orientation. The device may be otherwise oriented (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the utility model. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.

In the following description, for the purpose of providing a thorough understanding of the present utility model, detailed structures and steps are presented in order to illustrate the technical solution presented by the present utility model. Preferred embodiments of the present utility model are described in detail below, however, the present utility model may have other embodiments in addition to these detailed descriptions.

Example 1

The first embodiment of the utility model provides an intelligent fuse circuit of a new energy electric vehicle, which solves the problems that in the prior art, when the new energy electric vehicle is in overcurrent or short circuit, a switch cannot be disconnected, so that the new energy electric vehicle has potential safety hazard or cannot run.

As shown in fig. 1 and 2, the first embodiment of the present utility model provides an intelligent fuse circuit of a new energy electric vehicle, where the intelligent fuse circuit includes:

The contactor 10 comprises a contact switch 101 and an electromagnetic coil 102, wherein the contact switch comprises a movable contact piece 202, a first static contact piece 200 and a second static contact piece 201 which are arranged at intervals, the electromagnetic coil 102 comprises a first iron core 205, a second iron core 204, a coil framework, a connecting rod 203 and a coil winding 206, the coil framework is fixed inside the second iron core 204, the coil winding 206 is wound on the coil framework, one end of the connecting rod 203 is connected with the first iron core 205, the connecting rod 203 penetrates through the second iron core 204 and the coil framework, the other end of the connecting rod 203 is connected with the movable contact piece 202, the first static contact piece 200 is connected with an input module 20, and the second static contact piece 201 is connected with an output module 30;

a switch module 80, the input end of which is connected with the power module 40, and the output end of which is connected with the first end of the coil 206;

A first transistor 50 having a collector connected to the second end of the coil winding 206 and an emitter connected to ground;

A first voltage regulator 60 having a cathode terminal connected to the second terminal of the coil winding 206 and an anode terminal connected to the base of the first transistor 50;

The first output terminal of the controller 70 is connected to the control terminal of the switch module 80, and the second output terminal is connected to the gate of the first transistor 50.

The large current is a current with a current value exceeding a preset value. The output modules 20 and 30 can be power supply modules and various power utilization modules on the new energy electric vehicle.

The contactor 10 mainly plays a role in overload protection in the circuit. When an overload or short circuit and other abnormal conditions occur in the circuit, the contact switch can rapidly open the circuit, so that the current is cut off, the circuit and equipment are prevented from being damaged, and the safe operation of the circuit is ensured. The contactor 10 is composed of the contact switch 101 and the electromagnetic coil 102, the state of the electromagnetic coil 102 is regulated and controlled by the controller 70, signals of quick response to circuit abnormality can be realized, the contact switch 101 can finish the circuit breaking operation in extremely short time, and the timely protection of the circuit is ensured. The electromagnetic coil 102 is made of high-quality materials such as coil windings and iron cores, has high reliability and stability, can maintain stable performance in long-time use, and prolongs the service life of equipment.

The coil skeleton includes a first platform portion 207, a second platform portion 208, and a winding portion 209, where the first platform portion 207 contacts an inner surface of a first end of the second core 204, one end of the winding portion 209 is fixedly connected with the first platform portion 207, and passes through the first ends of the first platform portion 207 and the second core 204, the other end of the winding portion 209 is fixedly connected with the second platform portion 208, and passes through the second ends of the second platform portion 208 and the second core 204, and the coil winding 206 is wound on the winding portion 209.

Wherein the first and second platform portions 207 and 208 of the bobbin are disposed within the second core 204 and in contact with the inner surfaces of the second core 204, respectively, provide a stable support structure such that the entire coil winding 206 is firmly secured therein, and such a design ensures that the coil winding 206 is not loosened or displaced, improving the stability and reliability of the bobbin. The windings 209 in the bobbin provide suitable space for the coil windings 206 to be effectively disposed thereon, and the optimized winding layout can reduce losses such as resistance, inductance, and magnetic leakage, thereby improving efficiency and performance of the coil. The design of the coil framework can increase the surface area of the winding, and is beneficial to heat dissipation. Under the conditions of high power and high frequency, heat generated by the winding can be dissipated more quickly, the coil is prevented from overheating, and the reliability and the service life of the coil are improved. The design of the bobbin enables the coil winding 206 to be more stably and compactly assembled therein, facilitating manufacturing and maintenance, thus reducing manufacturing costs and improving production efficiency. The structure of the coil framework can reduce mutual inductance and electromagnetic interference between windings, and is beneficial to improving the electromagnetic performance and precision of the coil.

Wherein, a first contact 211 is disposed on a first surface of the first stationary contact plate 200, a second contact 212 is disposed on a first surface of the second stationary contact plate 201, a third contact 213 and a fourth contact 214 are disposed on a first surface of the movable contact plate 202, the first contact 211 and the third contact 213 are disposed opposite to each other, and the second contact 212 and the fourth contact 214 are disposed opposite to each other.

Wherein the first surface 217 of the first core 205 is disposed opposite the first surface 215 of the second core 204, and the second surface 218 of the first core 205 is disposed opposite the second surface 216 of the second core 204.

When the coil winding 206 is energized, attractive force is formed between the first iron core 205 and the second iron core 204, the first iron core 205 moves towards the direction approaching the second iron core 204 and contacts the second iron core 204, the first surface 217 of the first iron core 205 contacts the second surface 215 of the second iron core 204, the second surface 218 of the first iron core 205 contacts the second surface 216 of the second iron core 204, meanwhile, the movable contact piece 202 moves towards the first static contact piece 200 and the second static contact piece 201, the first contact 211 and the third contact 213 contact each other, the second contact 212 and the fourth contact 214 contact each other, and the contact switch 101 is in a conducting state.

When a large current exceeding a preset current value flows through the coil winding 206, a repulsive force larger than an attractive force is formed between the first iron core 205 and the second iron core 204, the first iron core 205 moves away from the second iron core 204 and separates from the second iron core 204, and the first contact 211 and the third contact 213 are separated, and the second contact 212 and the fourth contact 214 are separated. For example, when a short circuit fault occurs in a circuit in the new energy electric vehicle, the current suddenly changes to a large current, and a large amount of magnetic induction lines are generated by the large current to pass through the coil, in order to avoid the increase of the magnetic induction lines of the coil, a repulsive force is formed between the first iron core 205 and the second iron core 204, and when the repulsive force is greater than the attractive force, the first iron core 205 moves in a direction away from the second iron core 204, and at this time, the contact switch 101 is turned off.

Further, as an embodiment, an elastic member is disposed between the movable contact piece 202 and the winding portion 209, the elastic member is sleeved on the connecting rod 203, one end of the elastic member is connected to the movable contact piece 202, and the other end of the elastic member is connected to the winding portion 209.

In order to separate the first and second stationary contact pieces 200 and 201 from the movable contact piece 202 more quickly, an elastic member is provided between the movable contact piece 202 and the winding portion 209, and when the coil winding 206 is energized and the first and second stationary contact pieces 200 and 201 are in contact with the movable contact piece 202, the elastic member is in a stretched state, and when the coil winding 206 is de-energized, the elastic member moves the movable contact piece 202 away from the first and second stationary contact pieces 200 and 201.

The technical effects of the present embodiment are as follows: when the first and second static contact pieces are in contact with the moving contact piece, the elastic piece is in a stretched state, and a pulling force is formed between the moving contact piece and the winding part. When the coil winding is not electrified, the tension of the elastic piece enables the movable contact piece to be rapidly far away from the first static contact piece and the second static contact piece, and the contact points between the contact pieces are rapidly separated. Such rapid separation can effectively prevent the generation of an arc or spark, thereby reducing wear of contact parts and the risk of fire. The setting of elastic component does not need extra operation, and it can realize moving the keeping away from of contact piece according to compression state is automatic, has simplified the operation flow, has improved the convenience and the usability of equipment.

The switch module 80 is a MOS transistor, a source of the MOS transistor is an input end of the switch module 80, a drain of the MOS transistor is an output end of the switch module 80, and a gate of the MOS transistor is a control end of the switch module 80.

When the controller 70 controls the switch module 80 to be turned on, the power module 40 charges the electromagnetic coil 102 through the switch module 80, the contact switch 101 is turned on, and the input module 20, the contact switch 101 and the output module 30 form a loop. When the controller 70 controls the switch module 80 to turn off, the electromagnetic coil 102 still has energy, the contact switch 101 cannot be rapidly disconnected, by setting the first voltage stabilizing tube 60 and the first triode 70 to be connected in parallel, the electromotive force of the electromagnetic coil 102 can reversely break down the first voltage stabilizing tube 60, as shown in fig. 3, the current flow direction of the output current is divided into two paths, the first current flow path is the electromagnetic coil 102, the first triode 50 and the grounding end, and the second current flow path is the electromagnetic coil 102, the first voltage stabilizing tube 60, the first triode 50 and the grounding end, so that the energy stored by the electromagnetic coil 102 is rapidly guided to the ground through the first voltage stabilizing tube 60 and the first triode 50, and the contact switch 101 is rapidly disconnected.

The first technical scheme has the technical effects that: according to the technical scheme, the first static contact piece, the second static contact piece, the movable contact piece, the first iron core, the second iron core, the coil framework, the connecting rod and the coil winding are arranged on the mechanical structure, when the coil winding is electrified, the first iron core drives the movable contact piece to move towards the first static contact piece and the second static contact piece, the first static contact piece and the second static contact piece are in contact conduction with the movable contact piece, when the coil winding flows through a large current, the first iron core drives the movable contact piece to be quickly away from the first static contact piece and the second static contact piece, the contact between the first static contact piece and the second static contact piece and the movable contact piece can be quickly disconnected when short circuit or large current is realized, the first iron core and the second static contact piece are not adhered together, and the safety of a new energy electric vehicle is improved. Meanwhile, one end of the electromagnetic coil in the contactor is connected with the first voltage stabilizing tube and the first triode in the circuit structure, when the contactor is in a high-current working state, the energy stored by the electromagnetic coil can be guided to the ground through the first voltage stabilizing tube and the first triode, so that the problem that the contact switch is bonded and cannot be disconnected under high current is effectively avoided, the purpose of high-efficiency and quick disconnection is achieved, and the running safety of the new energy electric vehicle is improved. And through the stability control of the first voltage stabilizing tube, the energy stored by the electromagnetic coil can not generate excessive voltage in the process of guiding the ground, and the risk of equipment damage is avoided.

In a second technical solution provided in the first embodiment of the present utility model, as shown in fig. 4, the intelligent fuse circuit further includes:

the current detection module 90 is disposed adjacent to the contact switch 101, and has an output terminal connected to an input terminal of the controller 70.

When the controller 70 detects that the circuit in which the contact switch 101 is located is shorted or the current suddenly increases through the current detection module 90, the control switch module 80 is turned off, and the contact switch 101 is turned off.

Further, the current detection module 90 is a TMR (Tunneling Magnetoresistance Sensor, magnetoresistive tunneling magnetoresistance meter).

Wherein TMR is a method of detecting a current change by using a resistivity change of a magnetic field modulation. TMR elements are typically composed of two ferromagnetic electrodes and a non-magnetic insulating tunnel layer. When current passes through the tunnel layer, they interact with the magnetic electrons within the tunnel layer, causing a change in resistivity. This change in resistivity can be detected by measuring the resistance value of the device. When a magnetic field is applied to change, the magnetization directions of the two ferromagnetic electrodes change, so that the spin direction of the magnetic electrons in the tunnel layer relatively changes. Such a change in spin relative results in a change in the scattering rate of electrons in the tunnel layer and thus in a change in resistivity. Therefore, when a short circuit occurs in the circuit of the contact switch 101 or a large current occurs, the resistance value of the TMR element changes, and this change can be used to detect a change in current.

The technical effect of the second technical scheme is as follows: by employing the TMR element, current detection with high sensitivity, high speed, and high accuracy can be achieved. In addition, the TMR element has the advantages of lower power consumption and small volume.

As an example, as shown in fig. 5, the controller 70 is a single chip microcomputer, the intelligent fuse circuit further includes a communication module, the communication module is connected with the single chip microcomputer and the power supply, the single chip microcomputer receives an external instruction through the communication module, for example, the single chip microcomputer receives a power-off current value through the communication module, the intelligent fuse circuit further includes a diode D1 and a resistor R1, an anode of the diode D1 is connected with a second output end of the controller, a cathode of the diode D1 is connected with a first end of the resistor R1, and a second end of the resistor R1 is connected with a gate of the first triode. The first triode is triode Q1, and the first voltage regulator tube is voltage regulator tube D2. Specifically, the intelligent fuse circuit comprises a DC power supply, a MOS tube Q3, a contactor, a voltage stabilizing tube D2, a triode Q1, a resistor R1, a diode D1, a singlechip and a TMR. The DC power supply is connected with the source electrode of the MOS tube Q3, the drain electrode of the MOS tube Q3 is connected with the first end of an electromagnetic coil L in the contactor, the second end of the electromagnetic coil L is connected with the cathode end of a voltage stabilizing tube D2 and the collector electrode of a triode Q1, the anode end of the voltage stabilizing tube D2 is connected with the second end of a resistor R1 and the base electrode of the triode Q1, the first end of the resistor R1 is connected with the cathode of a diode D1, the anode of the diode D1 is connected with the first output end of a singlechip, the second output end of the singlechip is connected with the grid electrode of the MOS tube, TMR is positioned near a contact switch K, and the output end of TMR is connected with the input end of the singlechip.

Compared with the prior art, in the example, no voltage stabilizing tube is arranged in the prior art, when the controller controls the contactor to be disconnected, the energy in the electromagnetic coil can only slowly flow to the ground, and the contact switch can not be disconnected until the energy stored in the electromagnetic coil is released. The process requires about 40ms, and under the condition of large current, the contact switch is easy to adhere together, so that the driving safety of the new energy electric vehicle is affected.

The communication module has been increased in this example, can set up the outage current of singlechip through communication module, and added stabilizator D2 and triode Q1, when the singlechip detects and surpass outage current, control switch tube Q3 disconnection, electromagnetic coil L's electromotive force can be with stabilizator D2 reverse breakdown, make electromagnetic coil L stored energy pass through stabilizator D2 and triode Q1 and lead ground fast, as shown in FIG. 6, its current flow is divided into two routes, first current flow route is electromagnetic coil L, triode Q1 and earthing terminal, the second current flow route is electromagnetic coil L, stabilizator D2, triode Q1 and earthing terminal, make electromagnetic coil L stored energy pass through stabilizator D2 and triode Q1 and lead ground fast, thereby make contact switch break off fast. The time consumption of the process is about 2-4ms, which is far less than the time required by the condition without the voltage stabilizing tube D2, the conditions of sticking and the like of the contact switch can not occur, and the safety is greatly improved.

The technical effects of this example are: through setting up the stabilizator and being connected with solenoid's one end after triode connects in parallel, when taking place the short circuit or heavy current appears suddenly, can make contact switch break off fast, can not glue and glue together, promoted the security of new forms of energy electric motor car.

According to the technical scheme III provided by the embodiment of the utility model, as shown in fig. 7, the intelligent fuse circuit further comprises a resistor R2, a resistor R3, a resistor R4, a voltage stabilizing tube D3, a triode Q2 and a capacitor C1, wherein the second output end of the current detection module is connected with the cathode of the voltage stabilizing tube D3, the anode of the voltage stabilizing tube D3 is connected with the first end of the resistor R4 and the first end of the capacitor C1, the second end of the capacitor C1 is connected with the ground, the second end of the resistor R4 is connected with the base electrode of the triode Q2, the emitter electrode of the triode Q2 is connected with the ground, the collector electrode of the triode Q2 is respectively connected with the first end of the resistor R2 and the first end of the resistor R3, the second end of the resistor R2 is connected with the second output end of the controller, and the second end of the resistor R3 is connected with the second input end of the controller.

The working process of the third technical scheme is as follows: the TMR feeds back the detection signal to the singlechip and simultaneously transmits the voltage signal to the voltage stabilizing tube D3, if the contact switch K is not disconnected after 2-4ms, the triode Q2 is conducted after the capacitor C1 lags behind 1-2ms, so that the level of the singlechip and the diode D1 is changed from high to low, which is equivalent to the singlechip transmitting a disconnection signal, and the subsequent switch disconnection flow is the same as the above.

The technical effect of the third technical scheme is as follows: the technical scheme can avoid the problem that the switch cannot be disconnected due to the fact that energy cannot be quickly released when software is wrong, can improve the reliability and stability of the switch, and ensures the circuit safety under high current load.

Example two

The second embodiment of the utility model provides a new energy electric vehicle, which comprises the intelligent fuse circuit provided by the first embodiment.

The above embodiments are only for illustrating the technical solution of the present utility model, and are not limiting; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present utility model, and are intended to be included in the scope of the present utility model.

Claims (10)

1. An intelligent fuse circuit of a new energy electric vehicle, characterized in that the intelligent fuse circuit comprises:

The contactor comprises a contact switch and an electromagnetic coil, wherein the contact switch comprises a movable contact piece, a first static contact piece and a second static contact piece which are arranged at intervals, the electromagnetic coil comprises a first iron core, a second iron core, a coil framework, a connecting rod and a coil winding, the coil framework is fixed inside the second iron core, the coil winding is wound on the coil framework, one end of the connecting rod is connected with the first iron core, the connecting rod penetrates through the second iron core and the coil framework, the other end of the connecting rod is connected with the movable contact piece, the first static contact piece is connected with an input module, and the second static contact piece is connected with an output module;

The input end of the switch module is connected with the power supply module, and the output end of the switch module is connected with the first end of the coil winding;

The collector of the first triode is connected with the second end of the coil winding, and the emitter of the first triode is connected with the ground;

The cathode end of the first voltage stabilizing tube is connected with the second end of the coil winding, and the anode end of the first voltage stabilizing tube is connected with the base electrode of the first triode;

And a first output end of the controller is connected with a control end of the switch module, and a second output end of the controller is connected with a grid electrode of the first triode.

2. The intelligent fuse circuit of claim 1, wherein the bobbin comprises a first platform portion, a second platform portion, and a winding portion, the first platform portion contacts an inner surface of the first end of the second core, one end of the winding portion is fixedly connected to the first platform portion and passes through the first platform portion and the first end of the second core, the other end of the winding portion is fixedly connected to the second platform portion and passes through the second platform portion and the second end of the second core, and the coil winding is wound around the winding portion.

3. The intelligent fuse circuit of claim 2, wherein an elastic member is disposed between the movable contact piece and the winding portion, and the elastic member is sleeved on the connecting rod.

4. The intelligent fuse circuit of claim 1, wherein a first contact is provided on a first surface of the first stationary contact, a second contact is provided on a first surface of the second stationary contact, a third contact and a fourth contact are provided on a first surface of the movable contact, the first contact and the third contact are disposed opposite each other, and the second contact and the fourth contact are disposed opposite each other.

5. The intelligent fuse circuit of claim 1, wherein the switch module is a MOS transistor, a source of the MOS transistor is an input terminal of the switch module, a drain of the MOS transistor is an output terminal of the switch module, and a gate of the MOS transistor is a control terminal of the switch module.

6. The intelligent fuse circuit of claim 1, wherein the intelligent fuse circuit further comprises:

And the current detection module is arranged adjacent to the contact switch, and the first output end of the current detection module is connected with the first input end of the controller.

7. The intelligent fuse circuit of claim 6, further comprising:

The communication module is connected with the controller, and the controller receives external instructions through the communication module.

8. The intelligent fuse circuit of claim 6, further comprising a diode D1 and a resistor R1, wherein an anode of the diode D1 is connected to the second output terminal of the controller, a cathode of the diode D1 is connected to the first terminal of the resistor R1, and a second terminal of the resistor R1 is connected to the gate of the first transistor.

9. The intelligent fuse circuit of claim 8, further comprising a resistor R2, a resistor R3, a resistor R4, a regulator tube D3, a transistor Q2, and a capacitor C1, wherein the second output terminal of the current detection module is connected to the cathode of the regulator tube D3, the anode of the regulator tube D3 is connected to the first terminal of the resistor R4 and the first terminal of the capacitor C1, the second terminal of the capacitor C1 is connected to ground, the second terminal of the resistor R4 is connected to the base of the transistor Q2, the emitter of the transistor Q2 is connected to ground, the collector of the transistor Q2 is connected to the first terminal of the resistor R2 and the first terminal of the resistor R3, the second terminal of the resistor R2 is connected to the second output terminal of the controller, and the second terminal of the resistor R3 is connected to the second input terminal of the controller.

10. A new energy electric vehicle, characterized in that it comprises the intelligent fuse circuit according to any one of claims 1 to 9.