CN110994580A - Reverse connection preventing equipment and reverse connection preventing system - Google Patents
Reverse connection preventing equipment and reverse connection preventing system Download PDFInfo
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- CN110994580A CN110994580A CN201911417617.2A CN201911417617A CN110994580A CN 110994580 A CN110994580 A CN 110994580A CN 201911417617 A CN201911417617 A CN 201911417617A CN 110994580 A CN110994580 A CN 110994580A
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- reverse connection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H11/00—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result
- H02H11/002—Emergency protective circuit arrangements for preventing the switching-on in case an undesired electric working condition might result in case of inverted polarity or connection; with switching for obtaining correct connection
Abstract
The invention provides reverse connection prevention equipment and a reverse connection prevention system, wherein the reverse connection prevention equipment comprises an equipment circuit, a reverse connection prevention unit and a protection 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 and is used for conducting when the power supply is connected positively and current flows to the positive input end of the equipment circuit and switching off when the power supply is connected reversely; the protection unit is arranged at the common ground output end and is used for being disconnected when the current flowing through the common ground output end is larger than a set value so as to prevent the equipment circuit from being damaged. The reverse connection preventing equipment and the reverse connection preventing system provided by the invention can realize single-machine reverse connection prevention through the reverse connection preventing unit and the protecting unit when single equipment is used, and when multiple equipment is used, if any one equipment is reversely connected, current can be conducted to the ground through the common ground output end, at the moment, the power supply is in short circuit, the current is overlarge, the protecting unit is disconnected, so that a loop cannot be formed, and a protecting effect is realized.
Description
Technical Field
The invention relates to the technical field of electronic circuits, in particular to reverse connection prevention equipment and a reverse connection prevention system.
Background
In the use process of the existing circuit and equipment, the situation of reverse connection of a power supply is easy to occur, namely, the positive pole input end of the circuit is connected with the negative pole of the power supply in a wrong way, the negative pole input end of the power supply is connected with the positive pole of the power supply in a wrong way, and under the situation of reverse connection of the power supply, once a loop is formed in the circuit, irreversible damage can be caused to each device in the circuit. Most of the existing anti-reverse connection technologies are that an anti-reverse connection diode is connected in series on a power circuit, so that the anti-reverse connection function can be achieved for equipment used by a single machine, when two or more pieces of equipment connected in common ground are used, if two power supplies are connected in a positive-negative mode, the scheme cannot achieve the protection function, and if the anti-reverse connection diode is connected in series at the negative pole of the power supply, the voltage difference between a signal ground of the equipment and the negative pole of the power supply cannot be used for the equipment connected in common ground.
Disclosure of Invention
In view of this, an object of the embodiments of the present invention is to provide an anti-reverse apparatus and an anti-reverse system, so as to solve the problem that the existing anti-reverse apparatus cannot meet the requirement of anti-reverse.
The technical scheme adopted by the invention is as follows:
in a first aspect, the invention provides reverse connection prevention equipment, which is applied to a circuit in which multiple devices are connected in common with ground, and comprises an equipment circuit, a reverse connection prevention unit and a protection 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 electrically 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.
Further, the reverse connection preventing unit comprises a diode, and a cathode of the diode is electrically connected with an anode input end of the equipment circuit.
Further, the protection unit comprises a resettable fuse for disconnecting when the current flowing on the common ground output terminal is greater than a set value.
Further, the resettable fuse is also used for resetting connection when the current flowing on the common ground output terminal is reduced.
Further, the negative input end of the equipment circuit is connected with the common ground output end, when the negative input end is in misconnection with the positive electrode of the power supply, and the positive input end is in misconnection with the negative electrode of the power supply, the resistance current of the reverse connection prevention unit arranged at the positive input end reversely circulates, and the current passes through the positive electrode of the power supply, the negative input end and the common ground output end and is grounded so as to prevent the equipment circuit from being damaged.
In a second aspect, the invention further provides an anti-reverse connection system, which comprises two pieces of anti-reverse connection equipment, including first anti-reverse connection equipment and second anti-reverse connection equipment;
the first reverse connection preventing device comprises a first common ground output end and a first protection unit, and the second reverse connection preventing device comprises a second common ground output end and a second protection unit;
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.
Further, the first reverse-connection prevention device comprises a first negative input end electrically connected with the first common ground output end;
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.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides reverse connection prevention equipment and a reverse connection prevention system, wherein the reverse connection prevention equipment comprises an equipment circuit, a reverse connection prevention unit and a protection 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 and is used for conducting when current flows to the positive input end of the equipment circuit, and the reverse connection preventing unit 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 electrically connected with the common-ground output end, and the other end of the protection unit is grounded; the protection unit is used for being disconnected 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. The reverse connection preventing equipment and the reverse connection preventing system provided by the invention can realize single-machine reverse connection prevention through the reverse connection preventing unit and the protecting unit when single equipment is used, and when multiple equipment is used, if any one equipment is reversely connected, current can be conducted to the ground through the common ground output end, at the moment, the power supply is in short circuit, the current is overlarge, the protecting unit is disconnected, so that a loop cannot be formed, and a protecting effect is realized.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 shows a schematic diagram of an anti-reverse apparatus provided by the present invention.
FIG. 2 shows a schematic diagram of an anti-reverse system provided by the present invention.
Icon: 10-reverse-connection prevention system; 100-reverse-connection prevention equipment; 110-device circuitry; 120-reverse-connection preventing unit; 130-a protection unit; 200-a first reverse-connect prevention device; 210-first device circuitry; 220-a first reverse-connection prevention unit; 230-a first protection unit; 300-a second reverse-connect prevention device; 310-second device circuitry; 320-a second reverse-connection preventing unit; 330-second protection unit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when the products of the present invention are used, and are used for convenience of description and simplicity of description only, and do not indicate or imply that the devices or elements indicated must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements.
In the description of the present invention, it should also be noted that relational terms such as first and second, and the like, may be used solely herein to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Some embodiments of the invention are described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
When the existing circuit or equipment is used, the situation of reverse connection of a power supply is easy to occur, namely, the anode input end of the circuit is in wrong connection with the cathode of the power supply, the cathode input end of the circuit is in wrong connection with the anode of the power supply, and under the situation of reverse connection of the power supply, once the circuit forms a loop according to the wrong connected power supply, current flows reversely, and irreversible damage can be caused to each device in the circuit. Most of the existing anti-reverse connection technologies are that an anti-reverse connection diode is connected in series on a power circuit, so that the anti-reverse connection function can be achieved for equipment used by a single machine, when two or more pieces of equipment connected in common ground are used, if two power supplies are connected in a positive-negative mode, the scheme cannot achieve the protection function, and if the anti-reverse connection diode is connected in series at the negative pole of the power supply, the voltage difference between a signal ground of the equipment and the negative pole of the power supply cannot be used for the equipment connected in common ground.
In order to solve the above problem, the present embodiment provides a reverse connection preventing device, please refer to fig. 1, and fig. 1 is a schematic diagram of the reverse connection preventing device provided in the present embodiment.
The reverse connection preventing apparatus 100 provided in this embodiment includes an apparatus circuit 110, a reverse connection preventing unit 120, and a protection unit 130. The device circuit 110 is a working circuit of the reverse connection preventing 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 includes a positive input terminal, a negative input terminal, and a common ground output terminal; the positive input end is used for connecting the positive pole of a power supply, the negative input end is used for connecting the negative pole of the power supply, and the common ground output end is used for grounding.
During the operation, if the power source is not properly used, the power source may be reversely connected, for example, the positive input terminal is mistakenly connected to the negative terminal of the power source, and the negative input terminal is mistakenly connected to the positive terminal of the power source, when the power source is reversely connected, if the current in the device circuit 110 reversely flows to form a loop, the irreversible damage may be caused to each component in the device circuit 110. The reverse connection preventing apparatus 100 provided in the present embodiment is provided with a reverse connection preventing unit 120, and the reverse connection preventing unit 120 is used to prevent reverse connection of a power supply.
The reverse connection preventing unit 120 is disposed at the positive input end of the device circuit 110, the reverse connection preventing unit 120 is configured to be turned on when a current flows to the positive input end of the device circuit 110 to maintain normal operation of the circuit, and the reverse connection preventing unit 120 is further configured to be turned off when the current flows out of the positive input end of the device circuit 110 to avoid forming a loop and prevent a reverse current formed in the device circuit 110 from damaging components when the power supply is reversely connected.
The reverse connection preventing device 100 can be applied to a circuit in which multiple devices are connected in common, so that the reverse connection preventing device 100 is provided with a common-ground output terminal, in order to avoid an influence on other devices when the power supply of the reverse connection preventing device 100 is reversely connected, in the present embodiment, the common-ground output terminal is provided with a protection unit 130, in a possible implementation manner, one end of the protection unit 130 is electrically connected with the common-ground output terminal, and the other end of the protection unit 130 is grounded.
In the reverse connection prevention device 100 provided by this embodiment, by providing the reverse connection prevention unit 120 and the protection unit 130, when the power supply of the reverse connection prevention device 100 is reversely connected, the reverse circulation of the current in the device circuit 110 can be prevented from forming a loop, thereby preventing the internal devices of the device circuit 110 from being damaged, and meanwhile, when the current flowing through the common ground output end is large, the protection unit 130 is disconnected, thereby preventing the device from being damaged, and also preventing the influence on other devices due to the reverse connection of the power supply of the reverse connection prevention device 100.
In one possible implementation, the reverse connection preventing unit 120 includes a diode having 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 the 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 limits the current to flow to the positive input terminal of the device circuit 110 only through the external power source, when the power source is reversely connected, a loop cannot be formed due to the unidirectional conductivity of the diode, and the device circuit 110 can be prevented from being damaged.
It should be noted that the reverse connection preventing unit 120 includes, but is not limited to, a diode, and may also be another switch tube or any device having a reverse connection preventing function.
In one possible implementation, the protection unit 130 includes a resettable fuse, which is also called a self-resetting fuse, and is an overcurrent electronic protection element, the conventional fuse can be protected only once to be blown and needs to be replaced, and the self-resetting fuse has the dual functions of overcurrent and overheating protection and automatic resetting. When the circuit is short-circuited or overloaded, the large current flowing through the self-recovery fuse melts the polymer resin by the generated heat, the volume is rapidly increased to form a high-resistance state, the working current is rapidly reduced, so that the circuit is limited and protected, after the fault is eliminated, the self-recovery fuse is cooled again to crystallize, the volume is shrunk, the conductive particles form a conductive path again, and the self-recovery fuse is recovered to be in a low-resistance state, so that the circuit is protected without manual replacement.
In this embodiment, the first end of the recoverable fuse is electrically connected to the common-ground output end, and the second end of the recoverable fuse is grounded, so that the recoverable fuse is turned off when the current flowing through the common-ground output end is greater than a set value, the circuit is prevented from being damaged, and when a fault is eliminated, the current on the common-ground output end is reduced, and the recoverable fuse is restored to be connected.
In a possible implementation manner, the negative input terminal of the device circuit 110 is connected to the common ground output terminal, and when the negative input terminal is misconnected with the positive terminal of the power supply and the positive input terminal is misconnected with the negative terminal of the power supply, the resistance current of the reverse connection prevention unit 120 provided at the positive input terminal flows in the reverse direction, and the current is grounded through the positive terminal of the power supply, the negative input terminal and the common ground output terminal to prevent the device circuit 110 from being damaged. After the fault is cleared and the reverse connection is cancelled, the protection unit 130 is restored to the conducting state, and the device can still work normally.
Referring to fig. 2, in a possible implementation manner, the reverse connection preventing system 10 includes a first reverse connection preventing device 200 and a second reverse connection preventing device 300, and it should be noted that the principles and configurations of the first reverse connection preventing device 200 and the second reverse connection preventing device 300 are the same as those of the reverse connection preventing device 100 provided in the above embodiment, and both of them include a device circuit 110, a protection unit 130 and a reverse connection preventing unit 120, but the device circuits 110 of different reverse connection preventing devices 100 may be the same or different, which is not limited in this embodiment.
The first reverse connection prevention device 200 includes a first device circuit 210, a first reverse connection prevention unit 220, and a first protection unit 230, where the first device circuit 210 includes a first positive input terminal, a first negative input terminal, and a first common ground output terminal.
The first reverse connection preventing unit 220 is disposed at the first positive input end, the first reverse connection preventing unit 220 is configured to be turned on when a power supply is connected in the positive direction and a current flows to the first positive input end of the first device circuit 210 to maintain normal operation of the circuit, and the first reverse connection preventing unit 220 is further configured to be turned off when the power supply of the first reverse connection preventing device 200 is connected in the reverse direction to avoid forming a loop and prevent a reverse current formed in the first device circuit 210 from damaging components when the power supply is connected in the reverse direction.
The first common ground output terminal is provided with a first protection unit 230, and in one possible embodiment, one end of the first protection unit 230 is electrically connected with the first common ground output terminal, and the other end of the first protection unit 230 is connected with a second protection unit 330 of the second device circuit 310. The first protection unit 230 is configured to be turned off 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 reverse connection preventing device 300 includes a second device circuit 310, a second reverse connection preventing unit 320, and a second protection unit 330, where the second device circuit 310 includes a second positive input terminal, a second negative input terminal, and a second common ground output terminal.
The second reverse connection preventing unit 320 is disposed at the second positive input end, the second reverse connection preventing unit 320 is configured to be turned on when the power supply is connected positively and the current flows to the second positive input end of the second device circuit 310 to maintain the normal operation of the circuit, and the second reverse connection preventing unit 320 is further configured to be turned off when the power supply of the second reverse connection preventing device 300 is connected reversely to avoid forming a loop and prevent the component from being damaged by the reverse current formed in the second device circuit 310 when the power supply is connected reversely.
The second common ground output terminal is provided with a second protection unit 330, and in a possible embodiment, one end of the second protection unit 330 is electrically connected with the second common ground output terminal, and the other end of the second protection unit 330 is connected with the first protection unit 230 of the first device circuit 210. The second protection unit 330 is configured to be turned off when the current flowing through the second common ground output terminal is greater than a set value, so as to prevent the second device circuit 310 from being damaged.
The first reverse-connection prevention device 200 includes a first negative input terminal electrically connected to the first common ground output terminal; the second reverse blocking prevention apparatus 300 includes a second negative input electrically connected to the second common ground output. In one 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 reverse connection preventing system 10 provided in this embodiment can realize reverse connection prevention of a single device, and also can realize reverse connection prevention of multiple devices, and when the first reverse connection preventing device 200 or the second reverse connection preventing device 300 is reversely connected, a loop cannot be formed under the action of the reverse connection preventing unit 120, so as to play a role in protection. When multiple devices are used in common, two pieces of common ground connection equipment normally work when the first reverse connection prevention equipment 200 and the second reverse connection prevention equipment 300 are correctly connected, if the first reverse connection prevention equipment 200 and the second reverse connection prevention equipment 300 are reversely connected, the two pieces of equipment do not form a loop, and the equipment does not work and is not damaged. If the first reverse connection preventing device 200 is correctly connected, when the second reverse connection preventing device 300 is reversely connected, the current flow direction of the power supply is as follows, the power supply positive electrode-the second reverse connection preventing device 300 negative electrode-the common ground connection line-the first reverse connection preventing device 200 negative electrode-the power supply negative electrode (the power supply positive electrode is connected with the second reverse connection preventing device 300 negative electrode, the power supply negative electrode is connected with the first reverse connection preventing device 200 negative electrode), the power supply is short-circuited to generate a large current, the protection unit 130 is disconnected under the current effect to play a protection role, after the reverse connection is cancelled, the protection unit 130 is restored to a conducting state, and the device can still work normally.
In summary, the reverse connection prevention device and the reverse connection prevention system provided by the invention comprise a device circuit, a reverse connection prevention unit and a protection 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 and is used for conducting when current flows to the positive input end of the equipment circuit, and the reverse connection preventing unit 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 electrically connected with the common-ground output end, and the other end of the protection unit is grounded; the protection unit is used for being disconnected 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. The reverse connection preventing equipment and the reverse connection preventing system provided by the invention can realize single-machine reverse connection prevention through the reverse connection preventing unit and the protecting unit when single equipment is used, and when multiple equipment is used, if any one equipment is reversely connected, current can be conducted to the ground through the common ground output end, at the moment, the power supply is in short circuit, the current is overlarge, the protecting unit is disconnected, so that a loop cannot be formed, and a protecting effect is realized.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should 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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| Application Number | Priority Date | Filing Date | Title |
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| CN201911417617.2A CN110994580A (en) | 2019-12-31 | 2019-12-31 | Reverse connection preventing equipment and reverse connection preventing system |
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| CN201911417617.2A CN110994580A (en) | 2019-12-31 | 2019-12-31 | Reverse connection preventing equipment and reverse connection preventing system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112382028A (en) * | 2020-10-27 | 2021-02-19 | 淮北工科检测检验有限公司 | Alarm system utilizing photovoltaic power generation and working mode thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112382028A (en) * | 2020-10-27 | 2021-02-19 | 淮北工科检测检验有限公司 | Alarm system utilizing photovoltaic power generation and working mode thereof |
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