CN214900191U - Protection circuit for preventing reverse connection of power supply - Google Patents
Protection circuit for preventing reverse connection of power supply Download PDFInfo
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- CN214900191U CN214900191U CN202022346844.5U CN202022346844U CN214900191U CN 214900191 U CN214900191 U CN 214900191U CN 202022346844 U CN202022346844 U CN 202022346844U CN 214900191 U CN214900191 U CN 214900191U
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- protection circuit
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Abstract
The utility model relates to a power protection technical field especially relates to a protection circuit that reverse connection is prevented to power, wherein, include: a pair of power supply voltage input terminals including a positive input terminal and a negative input terminal; and the reverse connection prevention control module is connected between the positive input end and the negative input end so as to prevent a power supply from being reversely connected. Has the advantages that: the reverse connection prevention control module is connected between the pair of power supply voltage input ends to prevent the reverse connection phenomenon when the power supply is connected, so that the reverse connection prevention protection effect is formed, and the occurrence of accidents is avoided while the normal work of a system circuit is ensured.
Description
Technical Field
The utility model relates to a power protection technical field especially relates to a protection circuit that reverse connection is prevented to power.
Background
With the increasing requirements of various fields of national economy and national defense industry on electric energy conversion and processing and the requirements of energy conservation and new energy development, power semiconductor devices serving as core components of electric energy conversion devices also play an increasingly important role. At present, standardized socket terminals (such as TYPE-C, USB2.0, Micro USB and the like) are not used in many factory jigs, industrial motherboards and automation applications, but most of the terminals are used, however, when the terminals are used, manual operation is required, and there is a possibility that the power source is connected reversely.
In the prior art, a reverse connection prevention protection circuit of a power supply mostly uses a diode circuit, but when a large current is applied, the cost and the performance of the scheme of the diode circuit can not meet the requirements. Therefore, the above problems are difficult problems to be solved by those skilled in the art.
Disclosure of Invention
In view of the above problems in the prior art, a protection circuit for preventing reverse connection of a power supply is provided.
The specific technical scheme is as follows:
the utility model provides a protection circuit that power was prevented joining conversely, wherein, include:
a pair of power supply voltage input terminals including a positive input terminal and a negative input terminal;
and the reverse connection prevention control module is connected between the positive input end and the negative input end so as to prevent a power supply from being reversely connected.
Preferably, the reverse connection prevention control module comprises an MOS transistor, and a gate of the MOS transistor is connected to the positive input end;
and the source electrode of the MOS tube is connected to the negative electrode input end.
Preferably, the MOS tube is an N-type MOS tube.
Preferably, the load further comprises at least one load, an input end of the load is connected to the drain electrode of the MOS transistor, and an output end of the load is connected to the gate electrode of the MOS transistor.
Preferably, the MOS transistor includes a diode.
Preferably, the anode of the diode is connected to the gate, and the cathode of the diode is connected to the source.
Preferably, the diode is a parasitic diode of the MOS transistor.
The technical scheme has the following advantages or beneficial effects: the reverse connection prevention control module is connected between the pair of power supply voltage input ends to prevent the reverse connection phenomenon when the power supply is connected, so that the reverse connection prevention protection effect is formed, and the occurrence of accidents is avoided while the normal work of a system circuit is ensured.
Drawings
Fig. 1 is a schematic circuit diagram of an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, in the present invention, the embodiments and features of the embodiments may be combined with each other without conflict.
The present invention will be further described with reference to the accompanying drawings and specific embodiments, but the present invention is not limited thereto.
The utility model provides a protection circuit that power was prevented joining conversely, wherein, as shown in fig. 1, include:
a pair of power voltage input terminals 1, the pair of power voltage input terminals 1 including a positive input terminal VIN + and a negative input terminal VIN-;
and the reverse connection prevention control module 2 is connected between the positive input end VIN + and the negative input end VIN-to prevent reverse connection of a power supply.
Specifically, in the embodiment, the reverse connection prevention control module 2 is connected between the positive input end VIN + and the negative input end VIN-of the pair of power supply voltage input ends 1, and when the positive electrode of the power supply is connected to the positive input end VIN +, and the negative electrode of the power supply is connected to the negative input end VIN-, the reverse connection prevention control module 2 is conducted to form a loop, so that the circuit can normally work to indicate that the power supply is correctly connected to the circuit system; when the positive pole of power inserts negative pole input VIN-, when the negative pole of power inserts positive pole input VIN +, the reverse-connection prevention control module 2 can't switch on, then can't form the return circuit, and the unable normal work of circuit to form and prevent reverse-connection protection effect, the phenomenon of taking place the reverse-connection when avoiding the power to insert also avoids the emergence of accident when guaranteeing that system line normally works.
In a preferred embodiment, as shown in fig. 1, the reverse connection prevention control module 2 includes a MOS transistor Q1, a gate of the MOS transistor Q1 is connected to the positive input terminal VIN +;
the source of the MOS transistor Q1 is connected to the negative input VIN-.
Specifically, in this embodiment, the reverse connection prevention control module 2 in the above technical solution includes a MOS transistor Q1, the gate of the MOS transistor Q1 is connected to the positive input terminal VIN +, the source of the MOS transistor Q1 is connected to the negative input terminal VIN-, when the positive and negative poles of the power supply are correctly connected to the pair of power supply voltage input terminals 1, the gate of the MOS transistor Q1 is at a high level, and the source of the MOS transistor Q1 has a threshold voltage, that is, a voltage of 0.7V, so that the voltage V between the gate and the source of the MOS transistor Q1 is VGS>0V, so that the MOS tube Q1 is conducted, a loop is formed, and the circuit can work normally; when misconnection occurs, namely the positive pole of the power supply is connected with the negative pole input end VIN-, and the negative pole of the power supply is connected with the positive pole input end VIN +, the source electrode of the MOS transistor Q1 is at high level, the grid electrode of the MOS transistor Q1 is at low level, and the voltage V between the grid electrode and the source electrode of the MOS transistor Q1 is causedGS0V to make MOS pipe Q1 unable to switch on, thereby unable forming the return circuit, the unable normal work of circuit, thereby form and prevent reverse connection protection effect, avoidThe phenomenon of reverse connection occurs when the power supply is connected, so that the normal work of a system circuit is ensured, and meanwhile, accidents are avoided.
In a preferred embodiment, the MOS transistor Q1 is an N-type MOS transistor.
Specifically, the MOS transistor Q1 in the above technical solution is an N-type MOS transistor, and in this embodiment, the conduction principle of the N-type MOS transistor is used to prevent the reverse connection of the power supply, that is, the conduction principle of the N-type MOS transistor is that only the voltage V between the gate and the source of the N-type MOS transistor is presentGS>And the circuit is switched on when the voltage is 0V, and is switched off when the voltage is not 0V, so that the reverse connection prevention effect is formed.
In addition, in order to achieve the effect of preventing the reverse connection of the power supply, the N-type MOS transistor in this embodiment needs to be disposed at the negative input terminal VIN-.
In a preferred embodiment, the device further comprises at least one load 3, an input end of the load 3 is connected to the drain of the MOS transistor Q1, and an output end of the load 3 is connected to the gate of the MOS transistor Q1.
In a preferred embodiment, the MOS transistor Q1 includes a diode D.
Specifically, in the embodiment, in the above technical solution, when the positive and negative poles of the power supply are correctly connected to the pair of power supply voltage input terminals 1, the gate of the MOS transistor Q1 is at a high level, and due to the existence of the diode D, the source of the MOS transistor Q1 has a threshold voltage, that is, a voltage of 0.7V, and therefore, the voltage V between the gate and the source of the MOS transistor Q1GS>0V, so that the MOS tube Q1 is conducted, a loop is formed, and the circuit can work normally; when a misconnection occurs, namely the positive pole of the power supply is connected with the negative pole input end VIN-, and the negative pole of the power supply is connected with the positive pole input end VIN +, the source electrode of the MOS transistor Q1 is at a high level, the grid electrode of the MOS transistor Q1 is at a low level, the diode D is cut off, and the voltage V between the grid electrode and the source electrode of the MOS transistor Q1 is causedGS0V to make MOS pipe Q1 unable switch on, thereby can't form the return circuit, the unable normal work of circuit, thereby form and prevent reverse connection protective effect, take place the phenomenon of reverse connection when avoiding power to insert, also avoid accident's when guaranteeing that system line normally works emergence.
In a preferred embodiment, the anode of the diode D is connected to the gate and the cathode of the diode D is connected to the source.
In a preferred embodiment, diode D is a parasitic diode of MOS transistor Q1.
Specifically, the diode D is a parasitic diode.
The technical scheme has the following advantages or beneficial effects: the reverse connection prevention control module is connected between the pair of power supply voltage input ends to prevent the reverse connection phenomenon when the power supply is connected, so that the reverse connection prevention protection effect is formed, and the occurrence of accidents is avoided while the normal work of a system circuit is ensured.
The above description is only an example of the preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and those skilled in the art should be able to realize the equivalent alternatives and obvious variations of the present invention.
Claims (7)
1. A protection circuit for preventing reverse connection of a power supply is characterized by comprising:
a pair of power supply voltage input terminals including a positive input terminal and a negative input terminal;
and the reverse connection prevention control module is connected between the positive input end and the negative input end so as to prevent a power supply from being reversely connected.
2. The protection circuit of claim 1, wherein the reverse connection prevention control module comprises a MOS transistor, and a grid electrode of the MOS transistor is connected to the positive input end;
and the source electrode of the MOS tube is connected to the negative electrode input end.
3. The protection circuit of claim 2, wherein the MOS transistor is an N-type MOS transistor.
4. The protection circuit of claim 2, further comprising at least one load, an input terminal of the load being connected to the drain of the MOS transistor, and an output terminal of the load being connected to the gate of the MOS transistor.
5. The protection circuit of claim 2, wherein the MOS transistor comprises a diode.
6. The protection circuit of claim 5, wherein an anode of the diode is connected to the gate and a cathode of the diode is connected to the source.
7. The protection circuit of claim 5, wherein the diode is a parasitic diode of the MOS transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022346844.5U CN214900191U (en) | 2020-10-20 | 2020-10-20 | Protection circuit for preventing reverse connection of power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022346844.5U CN214900191U (en) | 2020-10-20 | 2020-10-20 | Protection circuit for preventing reverse connection of power supply |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214900191U true CN214900191U (en) | 2021-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022346844.5U Active CN214900191U (en) | 2020-10-20 | 2020-10-20 | Protection circuit for preventing reverse connection of power supply |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214900191U (en) |
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2020
- 2020-10-20 CN CN202022346844.5U patent/CN214900191U/en active Active
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