CN210867190U - Reverse connection preventing equipment and reverse connection preventing system - Google Patents

Abstract

The utility model provides an anti-reverse connection device and an anti-reverse connection system. The anti-reverse connection device includes a device circuit, an anti-reverse connection unit and a protection unit; the device circuit includes a positive input end, a negative input end and a common ground output end; The reverse connection unit is set at the positive input terminal, and the anti-reverse connection unit is used to conduct when the power supply is connected and the current flows to the positive input terminal of the equipment circuit, and turn off when the power supply is reversely connected; the protection unit is set at the common ground output terminal, the protection unit It is used to disconnect when the current flowing through the common ground output terminal is greater than the set value to prevent the equipment circuit from being damaged. The anti-reverse connection device and the anti-reverse connection system provided by the utility model can realize the single-machine anti-reverse connection through the anti-reverse connection unit and the protection unit when a single device is used. The current can be conducted to the ground through the common ground output terminal. At this time, the power supply is short-circuited, and the current is too large, and the protection unit will be disconnected, so that a loop cannot be formed to play a protective role.

Description

An anti-reverse connection device and an anti-reverse connection system

technical field

The utility model relates to the technical field of electronic circuits, in particular to an anti-reverse connection device and an anti-reverse connection system.

Background technique

During the use of existing circuits and equipment, it is easy to reverse the power supply, that is, the positive input terminal of the circuit is wrongly connected to the negative pole of the power supply, and the negative input terminal of the power supply is wrongly connected to the positive pole of the power supply. A loop is formed in the circuit, which may cause irreversible damage to the various devices in the circuit. Most of the existing anti-reverse connection technology is to connect an anti-reverse connection diode in series on the power circuit, so that it can prevent reverse connection for the equipment used in a single machine, but when two or more devices connected to the common ground are used, if When two power supplies are connected in positive and negative directions, the above solution cannot play a protective role. Moreover, if the anti-reverse diode is connected in series with the negative pole of the power supply, there is a voltage difference between the signal ground of the device and the negative pole of the power supply, which cannot be used on devices that are connected to the common ground. .

Utility model content

In view of this, the purpose of the embodiments of the present invention is to provide an anti-reverse connection device and an anti-reverse connection system, so as to improve the problem that the existing anti-reverse connection device cannot meet the requirements of anti-reverse connection.

The technical scheme adopted by the utility model is as follows:

In a first aspect, the present invention provides an anti-reverse connection device, the anti-reverse connection device is applied to a circuit in which multiple devices are connected to a common ground, and the anti-reverse connection device includes a device circuit, an anti-reverse connection unit and a protection unit; The equipment circuit includes a positive input terminal, a negative input terminal and a common ground output terminal; the anti-reverse connection unit is arranged on the positive input terminal, and the anti-reverse connection unit is used for when the current flows to the positive input terminal of the equipment circuit The anti-reverse connection unit is also used to turn off when the current flows out of the positive input terminal of the device circuit; the protection unit is arranged at the common ground output terminal, and one end of the protection unit is connected to the The common ground output terminal is electrically connected, and the other end of the protection unit is grounded; the protection unit is used to disconnect when the current flowing through the common ground output terminal is greater than the set value, so as to prevent the equipment circuit from being damaged .

Further, the anti-reverse connection unit includes a diode, and the cathode of the diode is electrically connected to the positive input terminal of the device circuit.

Further, the protection unit includes a recoverable fuse, and the recoverable fuse is used for disconnecting when the current flowing through the common ground output terminal is greater than a set value.

Further, the resettable fuse is also used to restore the connection when the current flowing through the common ground output terminal is reduced.

Further, the negative input terminal of the device circuit is connected to the common ground output terminal. When the negative input terminal is wrongly connected to the positive pole of the power supply and the positive input terminal is wrongly connected to the negative pole of the power supply, the positive input terminal is set. The resistance value current of the anti-reverse connection unit flows in the reverse direction, and the current is grounded through the positive pole of the power supply, the negative input terminal and the common ground output terminal to prevent damage to the device circuit.

In the second aspect, the present invention also provides an anti-reverse connection system, the anti-reverse connection system includes two anti-reverse connection devices as described above, including a first anti-reverse connection device and a second anti-reverse connection device;

The first anti-reverse connection device includes a first common ground output terminal and a first protection unit, and the second anti-reverse connection device includes a second common ground output terminal and a second protection unit;

The first end of the first protection unit is electrically connected to the first common ground output end; the first end of the second protection unit is electrically connected to the second common ground output end;

The second end of the first protection unit and the second end of the second protection unit are connected.

Further, the first anti-reverse connection device includes a first negative input terminal, and the first negative input terminal is electrically connected to the first common ground output terminal;

The second anti-reverse connection device includes a second negative input terminal, and the second negative input terminal is electrically connected to the second common ground output terminal;

The first negative input terminal and the second negative input terminal are used for connecting with the negative terminal of the power supply; the first positive input terminal and the second positive input terminal are used for connecting with the positive terminal of the power supply.

Relative to the prior art, the utility model has the following beneficial effects:

The utility model provides an anti-reverse connection device and an anti-reverse connection system. The anti-reverse connection device includes a device circuit, an anti-reverse connection unit and a protection unit; the device circuit includes a positive input end, a negative input end and a common ground output end; The reverse connection unit is arranged at the positive input end, and the anti-reverse connection unit is used to conduct when the current flows to the positive input end of the equipment circuit, and the anti-reverse connection unit is also used to turn off when the current flows out of the positive input end of the equipment circuit; the protection unit Set at the common ground output terminal, one end of the protection unit is electrically connected to the common ground output terminal, and the other end of the protection unit is grounded; the protection unit is used to disconnect when the current flowing through the common ground output terminal is greater than the set value to prevent the equipment circuit be damaged. The anti-reverse connection device and the anti-reverse connection system provided by the utility model can realize the single-machine anti-reverse connection through the anti-reverse connection unit and the protection unit when a single device is used. The current can be conducted to the ground through the common ground output terminal. At this time, the power supply is short-circuited, and the current is too large, and the protection unit will be disconnected, so that a loop cannot be formed to play a protective role.

In order to make the above-mentioned objects, features and advantages of the present utility model more obvious and easy to understand, preferred embodiments are given below, and are described in detail as follows in conjunction with the accompanying drawings.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings required in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention. Therefore, it should not be regarded as a limitation of the scope. For those of ordinary skill in the art, other related drawings can also be obtained from these drawings without any creative effort.

FIG. 1 shows a schematic diagram of an anti-reverse connection device provided by the present invention.

FIG. 2 shows a schematic diagram of an anti-reverse connection system provided by the present invention.

Icon: 10-Anti-reverse connection system; 100-Anti-reverse connection equipment; 110-Equipment circuit; 120-Anti-reverse connection unit; 130-Protection unit; - the first anti-reverse connection unit; 230 - the first protection unit; 300 - the second anti-reverse connection device; 310 - the second device circuit; 320 - the second anti-reverse connection unit; 330 - the second protection unit.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. . The components of the embodiments of the invention generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Accordingly, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present invention.

It should be noted that like numerals and letters refer to like items in the following figures, so once an item is defined in one figure, it does not require further definition and explanation in subsequent figures.

In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer", etc. The orientation or positional relationship, or the orientation or positional relationship that the utility model product is usually placed in use, is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific Orientation, construction and operation in a particular orientation, and therefore should not be construed as a limitation of the present invention.

In the description of the present invention, it should also be noted that, unless otherwise expressly specified and limited, the terms "arrangement", "installation", "connection" and "connection" should be understood in a broad sense, for example, it may be a fixed connection It can also be a detachable connection or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or the internal communication between the two components.

In the description of the present invention, it should also be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, not Any such actual relationship or ordering between these entities or operations must be required or implied. The terms "horizontal", "vertical", "overhanging" etc. do not imply that a component is required to be absolutely horizontal or overhang, but rather may be slightly inclined. For example, "horizontal" only means that its direction is more horizontal than "vertical", it does not mean that the structure must be completely horizontal, but can be slightly inclined. The terms "comprising", "comprising" or any other variation thereof are intended to encompass non-exclusive inclusion such that a process, method, article or device comprising a list of elements includes not only those elements, but also other not expressly listed elements, or also include elements inherent to such a process, method, article or apparatus. Without further limitation, an element qualified by the phrase "comprising a..." does not preclude the presence of additional identical elements in a process, method, article or apparatus that includes the element. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

Some embodiments of the present utility model will be described in detail below with reference to the accompanying drawings. The embodiments described below and features in the embodiments may be combined with each other without conflict.

During the use of existing circuits or equipment, it is relatively easy to reverse the power supply, that is, the positive input terminal of the circuit is wrongly connected to the negative pole of the power supply, and the negative input terminal of the circuit is wrongly connected to the positive pole of the power supply. , once the circuit forms a loop according to the wrongly connected power supply, the current flows in the reverse direction, which may cause irreversible damage to various devices in the circuit. Most of the existing anti-reverse connection technology is to connect an anti-reverse connection diode in series on the power circuit, so that it can prevent reverse connection for the equipment used in a single machine, but when two or more devices connected to the common ground are used, if When two power supplies are connected in positive and negative directions, the above solution cannot play a protective role. Moreover, if the anti-reverse diode is connected in series with the negative pole of the power supply, there is a voltage difference between the signal ground of the device and the negative pole of the power supply, which cannot be used on devices that are connected to the common ground. .

In order to improve the above problems, this embodiment provides an anti-reverse connection device. Please refer to FIG. 1 , which is a schematic diagram of the reverse connection prevention device provided in this embodiment.

The anti-reverse connection device 100 provided in this embodiment includes a device circuit 110 , an anti-reverse connection unit 120 and a protection unit 130 . The device circuit 110 is the working circuit of the anti-reverse connection device 100. For example, the device circuit 110 may be any possible circuit such as a radio frequency circuit, a power supply circuit, a signal conversion circuit, etc., which is not limited in this embodiment, and the device circuit 110 It includes a positive input terminal, a negative input terminal and a common ground output terminal; the positive input terminal is used for connecting the positive pole of the power supply, the negative input terminal is used for connecting the negative pole of the power supply, and the common ground output terminal is used for grounding.

In the process of use, improper use may lead to the reverse connection of the power supply, for example, the positive input terminal is wrongly connected to the negative pole of the power supply, and the negative input terminal is wrongly connected to the positive pole of the power supply. Then, irreversible damage may be caused to various components in the device circuit 110 . The anti-reverse connection device 100 provided in this embodiment is provided with an anti-reverse connection unit 120, and the reverse connection prevention unit 120 is used to prevent the reverse connection of the power supply.

The anti-reverse connection unit 120 is arranged at the positive input end of the device circuit 110. The anti-reverse connection unit 120 is used to conduct when the current flows to the positive input end of the device circuit 110, so as to maintain the normal operation of the circuit. The anti-reverse connection unit 120 is also used when When the current flows out of the positive input terminal of the device circuit 110, it is turned off to avoid the formation of a loop and prevent the reverse current in the device circuit 110 from damaging components when the power supply is reversely connected.

The anti-reverse connection device 100 can be applied to a circuit in which multiple devices are connected to a common ground. Therefore, the anti-reverse connection device 100 is provided with a common ground output terminal. Influence, in this embodiment, a protection unit 130 is provided at the common ground output end. In a possible implementation, one end of the protection unit 130 is electrically connected to the common ground output end, and the other end of the protection unit 130 is grounded.

In the anti-reverse connection device 100 provided in this embodiment, by setting the anti-reverse connection unit 120 and the protection unit 130, when the power supply of the anti-reverse connection device 100 is reversely connected, the current in the device circuit 110 can be prevented from flowing in reverse to form a loop, thereby preventing the equipment The internal devices of the circuit 110 are damaged, and at the same time, when the current flowing through the common ground output terminal is large, the protection unit 130 is disconnected to prevent damage to the equipment, and can also avoid the reverse connection of the power supply of the anti-reverse connection device 100 to other devices. cause an impact.

In a possible implementation manner, the anti-reverse connection unit 120 includes a diode, and the diode has unidirectional conductivity, that is, when a forward voltage is applied to the anode and the cathode of the diode, the diode is turned on. When a reverse voltage is applied to the anode and cathode, the diode is turned off. In this embodiment, the cathode of the diode is electrically connected to the positive input terminal of the device circuit 110, that is, the diode restricts the current to flow to the positive input terminal of the device circuit 110 only through the external power supply. Unidirectional conductivity, no loop can be formed, and damage to the device circuit 110 can be avoided.

It should be noted that the anti-reverse connection unit 120 includes but is not limited to a diode, and may also be other switch tubes or any device with an anti-reverse connection function.

In a possible implementation manner, the protection unit 130 includes a resettable fuse. The resettable fuse is also called as a resettable fuse, which is an overcurrent electronic protection element. Traditional fuse overcurrent protection can only protect once, burn out If it is broken, it needs to be replaced, and the self-recovery fuse has the dual function of overcurrent and thermal protection and automatic recovery. When the line is short-circuited or overloaded, the large current flowing through the resettable fuse will melt the polymer resin, and the volume will increase rapidly, forming a high-resistance state, and the working current will decrease rapidly, thereby limiting and protecting the circuit. After removal, the self-recovery fuse re-cools and crystallizes, the volume shrinks, the conductive particles form a conductive path again, and the self-recovery fuse returns to a low-resistance state, thus completing the protection of the circuit without manual replacement.

In this embodiment, the first end of the resettable fuse is electrically connected to the common ground output, and the second end of the resettable fuse is grounded, so that the resettable fuse is disconnected when the current flowing through the common ground output is greater than the set value. , to prevent damage to the circuit, when the fault is eliminated, the current on the output terminal of the common ground decreases, and the recoverable fuse restores the connection.

In a possible implementation manner, the negative input terminal of the device circuit 110 is connected to the common ground output terminal. When the negative input terminal is wrongly connected to the positive pole of the power supply and the positive input terminal is wrongly connected to the negative pole of the power supply, the anti-reverse connection unit 120 provided at the positive input terminal The resistance current flows in the reverse direction, and the current is grounded through the positive and negative input terminals of the power supply and the common ground output terminal to prevent damage to the device circuit 110 . After the fault is rectified and the reverse connection is canceled, the protection unit 130 returns to the conducting state, and the device can still work normally.

The present invention also provides an anti-reverse connection system 10. The anti-reverse connection system 10 includes at least two anti-reverse connection devices provided in the above-mentioned embodiments. Please refer to FIG. 2. The system 10 includes a first anti-reverse connection device 200 and a second anti-reverse connection device 300. It should be noted that the principles and structures of the first anti-reverse connection device 200 and the second anti-reverse connection device 300 are the same as those provided in the above embodiments. The anti-reverse connection device 100 is the same, and both include a device circuit 110, a protection unit 130 and an anti-reverse connection unit 120, but the device circuit 110 of different anti-reverse connection devices 100 may be the same or different, which is not made in this embodiment. limited.

The first anti-reverse connection device 200 includes a first device circuit 210, a first anti-reverse connection unit 220 and a first protection unit 230. The first device circuit 210 includes a first positive input terminal, a first negative input terminal and a first common ground output.

The first anti-reverse connection unit 220 is arranged at the first positive input terminal, and the first anti-reverse connection unit 220 is used for conducting when the power supply is connected and the current flows to the first positive input terminal of the first device circuit 210 to maintain the normal operation of the circuit, The first anti-reverse connection unit 220 is also used to turn off the power supply of the first anti-reverse connection device 200 when the power supply is reversely connected, so as to avoid the formation of a loop and prevent the reverse current in the first device circuit 210 from damaging components when the power supply is reversed.

The first common ground output terminal is provided with a first protection unit 230. In a possible implementation, one end of the first protection unit 230 is electrically connected to the first common ground output terminal, and the other end of the first protection unit 230 is electrically connected to the first common ground output terminal. The second protection unit 330 of the two device circuits 310 is connected. The first protection unit 230 is configured to disconnect when the current flowing through the first common ground output terminal is greater than a set value, so as to prevent the first device circuit 210 from being damaged.

The second anti-reverse connection device 300 includes a second device circuit 310 , a second anti-reverse connection unit 320 and a second protection unit 330 , and the second device circuit 310 includes a second positive input terminal, a second negative input terminal and a second common ground output.

The second anti-reverse connection unit 320 is disposed at the second positive input terminal. The second anti-reverse connection unit 320 is used to conduct electricity when the power supply is connected and the current flows to the second positive input terminal of the second device circuit 310 to maintain the normal operation of the circuit. The second anti-reverse connection unit 320 is also used to turn off when the power supply of the second anti-reverse connection device 300 is reversely connected, so as to avoid the formation of a loop and prevent the reverse current in the second device circuit 310 from damaging components when the power supply is reversed.

The second common ground output terminal is provided with a second protection unit 330. In a possible implementation, one end of the second protection unit 330 is electrically connected to the second common ground output terminal, and the other end of the second protection unit 330 is first The first protection unit 230 of the device circuit 210 is connected. The second protection unit 330 is configured to disconnect when the current flowing through the second common ground output terminal is greater than the set value, so as to prevent the second device circuit 310 from being damaged.

The first anti-reverse connection device 200 includes a first negative input terminal, and the first negative input terminal is electrically connected to the first common ground output terminal; the second anti-reverse connection device 300 includes a second negative input terminal, and the second negative input terminal is connected to the first common ground output terminal. The two common ground output terminals are electrically connected. In a possible implementation manner, the second end of the first protection unit 230 and the second end of the second protection unit 330 are connected.

The anti-reverse connection system 10 provided in this embodiment can realize anti-reverse connection of a single device, and can also realize anti-reverse connection of multiple devices. When a single device is used, the first anti-reverse connection device 200 or the second anti-reverse connection device 300 is reversely connected At this time, under the action of the anti-reverse connection unit 120, a loop cannot be formed, which plays a protective role. When multiple devices are used in common ground, when the first anti-reverse connection device 200 and the second anti-reverse connection device 300 are correctly wired, the two common ground connection devices work normally. When the devices 300 are all reversely connected, neither of the two devices forms a loop, and the devices do not work and are not damaged. If the first anti-reverse connection device 200 is correctly wired, and the second anti-reverse connection device 300 is reversely connected, the current flow of the power supply is: the positive pole of the power supply - the negative pole of the second anti-reverse connection device 300 - the common ground connection line - the first anti-reverse connection The negative pole of the device 200 - the negative pole of the power supply (the positive pole of the power supply is connected to the negative pole of the second anti-reverse connection device 300, and the negative pole of the power supply is connected to the negative pole of the first anti-reverse connection device 200). The open connection plays a protective role. After the reverse connection is cancelled and the short circuit is cancelled, the protection unit 130 returns to the conducting state, and the device can still work normally.

To sum up, the utility model provides an anti-reverse connection device and an anti-reverse connection system. The anti-reverse connection device includes a device circuit, an anti-reverse connection unit and a protection unit; the device circuit includes a positive input terminal, a negative input terminal and a common terminal. The ground output terminal; the anti-reverse connection unit is arranged at the positive input terminal, the anti-reverse connection unit is used to conduct when the current flows to the positive input terminal of the equipment circuit, and the anti-reverse connection unit is also used when the current flows out of the positive input terminal of the equipment circuit. The protection unit is set at the common ground output terminal, one end of the protection unit is electrically connected to the common ground output terminal, and the other end of the protection unit is grounded; the protection unit is used to disconnect when the current flowing through the common ground output terminal is greater than the set value , to prevent damage to the device circuit. The anti-reverse connection device and the anti-reverse connection system provided by the utility model can realize the single-machine anti-reverse connection through the anti-reverse connection unit and the protection unit when a single device is used. The current can be conducted to the ground through the common ground output terminal. At this time, the power supply is short-circuited, and the current is too large, and the protection unit will be disconnected, so that a loop cannot be formed to play a protective role.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model. For those skilled in the art, the present utility model may have various modifications and changes. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims (7)

1. The reverse connection preventing equipment is characterized by being applied to a circuit with multiple devices connected in common ground, and comprising an equipment circuit, a reverse connection preventing unit and a protecting unit;

the equipment circuit comprises a positive input end, a negative input end and a common ground output end;

the reverse connection preventing unit is arranged at the positive input end, is used for conducting when current flows to the positive input end of the equipment circuit, and is also used for switching off when the current flows out of the positive input end of the equipment circuit;

the protection unit is arranged at the common-ground output end, one end of the protection unit is connected with the common-ground output end, and the other end of the protection unit is grounded; the protection unit is used for being switched off when the current flowing on the common ground output end is larger than a set value so as to prevent the equipment circuit from being damaged.

2. Reverse-connection prevention apparatus according to claim 1, characterized in that the reverse-connection prevention unit comprises a diode, the cathode of which is electrically connected to the positive input of the apparatus circuit.

3. The apparatus according to claim 1, characterized in that said protection unit comprises a restorable fuse for opening when the current flowing on said common ground output is greater than a set value.

4. The apparatus of claim 3, wherein the resettable fuse is further configured to resume conduction when the current flowing on the common ground output decreases.

5. The reverse connection prevention device of claim 1, wherein the negative input end and the common ground output end of the device circuit are connected, and when the negative input end is misconnected with a positive power supply and the positive input end is misconnected with a negative power supply, the reverse connection prevention unit arranged at the positive input end prevents current from flowing in a reverse direction so as to prevent damage to the device circuit.

6. An anti-reverse connection system, which is characterized by comprising at least two pieces of anti-reverse connection equipment according to any one of claims 1 to 5, wherein the anti-reverse connection equipment comprises first anti-reverse connection equipment and second anti-reverse connection equipment;

the first reverse connection preventing device comprises a first common ground output end, a first protection unit and a first reverse connection preventing unit; the first reverse connection preventing unit is arranged at a first positive electrode input end of the first reverse connection preventing device;

the second reverse connection preventing device comprises a second common ground output end, a second protection unit and a second reverse connection preventing unit; the second reverse connection preventing unit is arranged at a second positive electrode input end of the second reverse connection preventing device;

the first end of the first protection unit is electrically connected with the first common ground output end; the first end of the second protection unit is electrically connected with the second common ground output end;

the second end of the first protection unit is connected with the second end of the second protection unit.

7. The reverse connection prevention system of claim 6 wherein the first reverse connection prevention device comprises a first negative input electrically connected to the first common ground output;

the second reverse-connection preventing device comprises a second negative electrode input end which is electrically connected with the second common ground output end;

the first negative electrode input end and the second negative electrode input end are used for being connected with a negative electrode of a power supply; the first positive input end and the second positive input end are used for being connected with the positive pole of the power supply.

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