CN219268494U - Power supply reverse connection prevention protection circuit, circuit board and electronic equipment - Google Patents
Power supply reverse connection prevention protection circuit, circuit board and electronic equipment Download PDFInfo
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- CN219268494U CN219268494U CN202223123192.4U CN202223123192U CN219268494U CN 219268494 U CN219268494 U CN 219268494U CN 202223123192 U CN202223123192 U CN 202223123192U CN 219268494 U CN219268494 U CN 219268494U
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Abstract
The utility model discloses a power supply reverse connection prevention protection circuit, a circuit board and electronic equipment, wherein the power supply reverse connection prevention protection circuit comprises a first power supply port; a second power port; the charging management module comprises a charging output port; the load working module comprises a voltage input port, and the voltage input port is connected with the charging output port; the reverse connection prevention protection module comprises a first switching tube and a second switching tube, and a source electrode of the first switching tube is connected with the voltage input port; the drain electrode of the first switching tube is connected with the first power supply port, the grid electrode of the first switching tube is connected with the charging output port, the source electrode of the second switching tube is connected with the second power supply port, and the drain electrode of the second switching tube is connected with the grid electrode of the first switching tube; the grid of the second switching tube is connected with the first power port, and a first resistor is connected between the grid of the first switching tube and the charging output port. The technical scheme of the utility model can protect the circuit board under the condition that the anode and the cathode of the power supply are reversely connected, and improves the safety performance of the electronic equipment.
Description
Technical Field
The present utility model relates to the field of electronic circuits, and in particular, to a power supply reverse connection protection circuit, a circuit board, and an electronic device.
Background
The power supply supplies power to the electronic products, and is an important part of the electronic equipment. There are more and more products with power supply on the market, and when using such products, the situation that the positive and negative poles of the power supply are reversely connected may occur due to negligence of users. When the positive electrode and the negative electrode of the power supply are connected reversely, the phenomenon of circuit short circuit can occur, so that the product cannot be used, and potential safety hazards exist.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the power supply reverse connection prevention protection circuit, the circuit board and the electronic equipment, which can play a role in protecting the circuit board and improve the safety performance of the electronic equipment under the condition that the positive electrode and the negative electrode of the power supply are reversely connected.
In a first aspect, an embodiment of the present utility model provides a reverse connection protection circuit for a power supply, including:
a first power port;
a second power port;
the charging management module comprises a charging output port;
the load working module comprises a voltage input port, and the voltage input port is connected with the charging output port;
the reverse connection prevention protection module comprises a first switching tube and a second switching tube, wherein a source electrode of the first switching tube is connected with the voltage input port, a drain electrode of the first switching tube is connected with the first power supply port, and a grid electrode of the first switching tube is connected with the charging output port; the source electrode of the second switching tube is connected with the second power supply port, the drain electrode of the second switching tube is connected with the grid electrode of the first switching tube, the grid electrode of the second switching tube is connected with the first power supply port, and a first resistor is connected between the grid electrode of the first switching tube and the charging output port.
The power supply reverse connection prevention protection circuit provided by the utility model has at least the following beneficial effects: the first power port and the second power port are used for being connected with a power supply, and the power supply is connected into a power supply reverse connection preventing protection circuit; the charging output port of the charging management module is connected with the voltage input port of the load working module, the charging management module plays a role in charging a power supply, and an anti-reverse connection protection module is connected between the charging management module and the power supply port. In the reverse connection prevention protection module, a source electrode of a first switching tube is connected with a voltage input port, a drain electrode of the first switching tube is connected with a first power supply port, and a grid electrode of the first switching tube is connected with a charging output port; the source electrode of the second switching tube is connected with the second power supply port, the drain electrode of the second switching tube is connected with the grid electrode of the first switching tube, and the grid electrode of the second switching tube is connected with the first power supply port; a first resistor is connected between the grid electrode of the first switching tube and the charging output port. When the power supply reverse connection prevention protection circuit is adopted to charge the access power supply, the first power supply port is connected with the positive electrode of the power supply, the second power supply port is connected with the negative electrode of the power supply, namely, under the condition that the positive electrode and the negative electrode of the power supply are normally connected, the first switching tube and the second switching tube are both in a conducting state, so that the charging management module can normally charge the power supply, and meanwhile, the power supply can provide electric energy for the load working module; the first power port is connected with the power supply negative electrode, the second power port is connected with the power supply positive electrode, namely, under the condition that the power supply positive electrode and the power supply negative electrode are reversely connected, the first switch tube and the second switch tube are in a cut-off state, the occurrence probability of the condition that a loop is formed between the charging management module and the power supply port to burn out a circuit board is reduced, the effect of protecting the circuit board is achieved, and the safety performance of electronic equipment is improved.
According to some embodiments of the utility model, a second resistor is connected between the gate of the second switching tube and the first power supply port.
According to some embodiments of the utility model, the first switching tube comprises: and the anode of the first parasitic diode is connected with the drain electrode of the first switching tube, and the cathode of the first parasitic diode is connected with the source electrode of the first switching tube.
According to some embodiments of the utility model, the first switching transistor is a P-channel mosfet.
According to some embodiments of the utility model, the second switching tube comprises: and the anode of the second parasitic diode is connected with the source electrode of the second switching tube, and the cathode of the second parasitic diode is connected with the drain electrode of the second switching tube.
According to some embodiments of the utility model, the second switching tube is an N-channel mosfet.
According to some embodiments of the utility model, the first resistor has a resistance value of 330kΩ.
According to some embodiments of the utility model, the second resistor has a resistance value of 100deg.C.
In a second aspect, an embodiment of the present utility model provides a circuit board, including the power supply anti-reverse connection protection circuit according to the first aspect.
The circuit board provided by the embodiment of the utility model has at least the following beneficial effects: when the power supply reverse connection prevention protection circuit is adopted to charge the access power supply, the first power supply port is connected with the positive electrode of the power supply, the second power supply port is connected with the negative electrode of the power supply, namely, under the condition that the positive electrode and the negative electrode of the power supply are normally connected, the first switching tube and the second switching tube are both in a conducting state, so that the charging management module can normally charge the power supply, and meanwhile, the power supply can provide electric energy for the load working module; the first power port is connected with the power supply negative electrode, the second power port is connected with the power supply positive electrode, namely, under the condition that the power supply positive electrode and the power supply negative electrode are reversely connected, the first switch tube and the second switch tube are in a cut-off state, the occurrence probability of the condition that a loop is formed between the charging management module and the power supply port to burn out a circuit board is reduced, the effect of protecting the circuit board is achieved, and the safety performance of electronic equipment is improved.
In a third aspect, an embodiment of the present utility model provides an electronic device, including a circuit board as described in the second aspect.
The electronic equipment provided by the embodiment of the utility model has at least the following beneficial effects: in the electronic equipment, when the first power port is connected with the positive electrode of the power supply and the second power port is connected with the negative electrode of the power supply, namely the positive electrode and the negative electrode of the power supply are connected normally, the first switching tube and the second switching tube are in a conducting state, so that the charging management module can charge the power supply normally; the first power port is connected with the power supply negative electrode, the second power port is connected with the power supply positive electrode, namely, under the condition that the power supply positive electrode and the power supply negative electrode are reversely connected, the first switch tube and the second switch tube are in a cut-off state, the occurrence probability of the condition that a loop is formed between the charging management module and the power supply port to burn out a circuit board is reduced, the effect of protecting the circuit board is achieved, and the safety performance of electronic equipment is improved.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
Additional aspects and advantages of the present utility model will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings, in which:
fig. 1 is a schematic structural diagram of a power supply reverse connection prevention protection circuit according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of the power supply anti-reverse connection protection circuit under the power supply forward connection condition according to the embodiment of the present utility model;
fig. 3 is a schematic diagram of the operation of the power supply anti-reverse connection protection circuit under the power supply reverse connection condition according to the embodiment of the present utility model.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
The utility model provides a power supply reverse connection prevention protection circuit, a circuit board and electronic equipment, wherein when an access power supply is charged by adopting the power supply reverse connection prevention protection circuit through a reverse connection prevention protection module 150 connected between a power supply port and a charging management module 130, under the condition that a first power supply port 110 is connected with a power supply negative electrode, a second power supply port 120 is connected with a power supply positive electrode, namely the power supply positive electrode and the power supply negative electrode are connected reversely, a first switching tube Q1 and a second switching tube Q2 are both in a cut-off state, the occurrence probability of the condition that a loop is formed between the charging management module 130 and the power supply port to burn out the circuit board is reduced, the circuit board is protected, and the safety performance of the electronic equipment is improved.
In a first aspect, as shown in fig. 1, fig. 1 is a schematic structural diagram of a power supply reverse connection protection circuit according to an embodiment of the present utility model. The power anti-reverse protection circuit includes a first power port 110, a second power port 120, a charge management module 130, a load operation module 140, and an anti-reverse protection module 150. Wherein the charge management module 130 includes a charge output port; the load work module 140 comprises a voltage input port, and the voltage input port is connected with the charging output port; the anti-reverse connection protection module 150 comprises a first switching tube Q1 and a second switching tube Q2, wherein a source electrode (S electrode) of the first switching tube Q1 is connected with a voltage input port; the drain electrode (D pole) of the first switching tube Q1 is connected with the first power supply port 110, the grid electrode (G pole) of the first switching tube Q1 is connected with the charging output port, the source electrode (S pole) of the second switching tube Q2 is connected with the second power supply port 120, the drain electrode (D pole) of the second switching tube Q2 is connected with the grid electrode (G pole) of the first switching tube Q1, and the grid electrode (G pole) of the second switching tube Q2 is connected with the first power supply port 110; a first resistor R1 is connected between the gate (G-pole) of the first switching tube Q1 and the charging output port.
According to the power supply reverse connection prevention protection circuit provided by the utility model, the first power supply port 110 and the second power supply port 120 are used for being connected with a power supply, and the power supply is connected into the power supply reverse connection prevention protection circuit; the charging output port of the charging management module 130 is connected with the voltage input port of the load working module 140, the charging management module 130 plays a role in charging the power supply, and the reverse connection preventing protection module 150 is connected between the charging management module 130 and the power supply port. In the reverse connection preventing protection module 150, a source electrode of the first switching tube Q1 is connected with a voltage input port; the drain electrode of the first switching tube Q1 is connected with the first power supply port 110, the grid electrode of the first switching tube Q1 is connected with the charging output port, the source electrode of the second switching tube Q2 is connected with the second power supply port 120, and the drain electrode of the second switching tube Q2 is connected with the grid electrode of the first switching tube Q1; the gate of the second switching tube Q2 is connected to the first power port 110, and a first resistor R1 is connected between the gate of the first switching tube Q1 and the charging output port. When the power supply reverse connection prevention protection circuit is adopted to charge the access power supply, under the condition that the first power supply port 110 is connected with the positive electrode of the power supply, the second power supply port 120 is connected with the negative electrode of the power supply, namely the positive electrode and the negative electrode of the power supply are connected normally, the first switching tube Q1 and the second switching tube Q2 are both in a conducting state, so that the charging management module 130 can charge the power supply normally, and meanwhile, the power supply can provide electric energy for the load working module 140; under the conditions that the first power port 110 is connected with the negative electrode of the power supply and the second power port 120 is connected with the positive electrode of the power supply, namely, the positive electrode and the negative electrode of the power supply are reversely connected, the first switching tube Q1 and the second switching tube Q2 are in a cut-off state, the occurrence probability of the condition that a loop is formed between the charging management module 130 and the power port to burn out a circuit board is reduced, the circuit board is protected, and the safety performance of electronic equipment is improved.
According to some embodiments of the utility model, the power supply anti-reverse protection circuit further comprises a second resistor R2. A second resistor R2 is connected between the gate of the second switching tube Q2 and the first power port 110. Specifically, the resistance value of the first resistor R1 is 330kΩ, and the resistance value of the second resistor R2 is 100 Ω. Under the condition that faults such as short circuit occur in the power supply reverse connection prevention protection circuit, the first resistor R1 and the second resistor R2 can both play roles in protecting the power supply and the charging management module 130.
According to some embodiments of the utility model, the first switching tube Q1 includes: a first parasitic diode D1. The anode of the first parasitic diode D1 is connected to the drain of the first switching tube Q1, and the cathode of the first parasitic diode D1 is connected to the source of the first switching tube Q1. Specifically, the first switching transistor Q1 is a pmos field effect transistor. The first switching tube Q1 is turned off when the power supply is reversely connected, and can protect the battery.
According to some embodiments of the utility model, the second switching tube Q2 includes: and a second parasitic diode D2, wherein the anode of the second parasitic diode D2 is connected with the source electrode of the second switching tube Q2, and the cathode of the second parasitic diode D2 is connected with the drain electrode of the second switching tube Q2. Specifically, the second switching transistor Q2 is an N-channel mosfet. The second switching tube Q2 enters a cut-off state under the condition that the power supply is reversely connected, and can play a role in protecting the battery.
As shown in fig. 2, fig. 2 is a schematic diagram illustrating the operation of the power supply anti-reverse connection protection circuit under the power supply forward connection condition according to the embodiment of the present utility model. When the power supply reverse connection prevention protection circuit is adopted to charge an access power supply, under the condition that the first power supply port 110 is connected with the positive electrode of the power supply, the second power supply port 120 is connected with the negative electrode of the power supply, namely the positive electrode and the negative electrode of the power supply are connected with normal conditions, the positive electrode of the power supply outputs power supply current, after passing through the first power supply port 110, the power supply current flows to the source electrode of the first switching tube Q1 through the first parasitic diode D1 inside, the grid electrode of the first switching tube Q1 is grounded, and the grid voltage of the first switching tube Q1 is smaller than the source electrode voltage to form negative voltage, so that the first switching tube Q1 is in a conducting state. In addition, the power supply anode outputs a power supply current, the power supply current flows to the grid electrode of the second switching tube Q2 through the second resistor R2, the source electrode of the second switching tube Q2 is grounded, and the grid electrode voltage of the second switching tube Q2 is higher than the source electrode voltage to form a positive voltage, so that the second switching tube Q2 is in a conducting state. The power supply can supply power to the load module through the conduction power supply of the first switching tube Q1, and the charging management module 130 can also charge the battery through the conduction power supply of the first switching tube Q1. The magnitude of the charging current and the load operating current depends on the specification of the first switching tube Q1. The first switching tube Q1 and the second switching tube Q2 enter a conductive state, so that the charge management module 130 can normally charge the power supply, and the power supply can provide electric energy for the load operation module 140.
As shown in fig. 3, fig. 3 is a schematic diagram illustrating the operation of the power supply anti-reverse connection protection circuit under the power supply reverse connection condition according to the embodiment of the present utility model. When the first power port 110 is connected with the negative electrode of the power supply, and the second power port 120 is connected with the positive electrode of the power supply, that is, the positive electrode and the negative electrode of the power supply are connected reversely, the drain electrode of the first switching tube Q1 is grounded, and when the charging management module 130 charges the power supply, the grid electrode and the source electrode of the first switching tube Q1 are both in high level, so that the first switching tube Q1 is in a cut-off state; the source of the second switching tube Q2 is at a high level, and the gate is grounded, so that the second switching tube Q2 is in an off state. The first switching tube Q1 and the second switching tube Q2 are in the cut-off state, so that the occurrence probability of the condition that a loop is formed between the charging management module 130 and the power port to burn out a circuit board is reduced, the circuit board is protected, and the safety performance of electronic equipment is improved.
In a second aspect, an embodiment of the present utility model provides a circuit board, including the power supply anti-reverse connection protection circuit as in the first aspect.
The circuit board provided by the embodiment of the utility model has at least the following beneficial effects: when the power supply reverse connection prevention protection circuit is adopted to charge the access power supply, under the condition that the first power supply port 110 is connected with the positive electrode of the power supply, the second power supply port 120 is connected with the negative electrode of the power supply, namely the positive electrode and the negative electrode of the power supply are connected normally, the first switching tube Q1 and the second switching tube Q2 are both in a conducting state, so that the charging management module 130 can charge the power supply normally, and meanwhile, the power supply can provide electric energy for the load working module 140; under the conditions that the first power port 110 is connected with the negative electrode of the power supply and the second power port 120 is connected with the positive electrode of the power supply, namely, the positive electrode and the negative electrode of the power supply are reversely connected, the first switching tube Q1 and the second switching tube Q2 are in a cut-off state, the occurrence probability of the condition that a loop is formed between the charging management module 130 and the power port to burn out a circuit board is reduced, the circuit board is protected, and the safety performance of electronic equipment is improved.
In a third aspect, embodiments of the present utility model provide an electronic device comprising a circuit board as in the second aspect.
The electronic equipment provided by the embodiment of the utility model has at least the following beneficial effects: in the electronic device, when the first power port 110 is connected with the positive electrode of the power supply, and the second power port 120 is connected with the negative electrode of the power supply, that is, the positive electrode and the negative electrode of the power supply are connected normally, the first switching tube Q1 and the second switching tube Q2 are both in a conducting state, so that the charging management module 130 can charge the power supply normally; under the conditions that the first power port 110 is connected with the negative electrode of the power supply and the second power port 120 is connected with the positive electrode of the power supply, namely, the positive electrode and the negative electrode of the power supply are reversely connected, the first switching tube Q1 and the second switching tube Q2 are in a cut-off state, the occurrence probability of the condition that a loop is formed between the charging management module 130 and the power port to burn out a circuit board is reduced, the circuit board is protected, and the safety performance of electronic equipment is improved.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
Claims (10)
1. A reverse connection prevention protection circuit for a power supply, comprising:
a first power port;
a second power port;
the charging management module comprises a charging output port;
the load working module comprises a voltage input port, and the voltage input port is connected with the charging output port;
the reverse connection prevention protection module comprises a first switching tube and a second switching tube, wherein a source electrode of the first switching tube is connected with the voltage input port, a drain electrode of the first switching tube is connected with the first power supply port, and a grid electrode of the first switching tube is connected with the charging output port; the source electrode of the second switching tube is connected with the second power supply port, the drain electrode of the second switching tube is connected with the grid electrode of the first switching tube, and the grid electrode of the second switching tube is connected with the first power supply port; and a first resistor is connected between the grid electrode of the first switching tube and the charging output port.
2. The power supply anti-reverse connection protection circuit according to claim 1, wherein a second resistor is connected between the gate of the second switching tube and the first power supply port.
3. The power supply anti-reverse protection circuit according to claim 1, wherein the first switching tube comprises: and the anode of the first parasitic diode is connected with the drain electrode of the first switching tube, and the cathode of the first parasitic diode is connected with the source electrode of the first switching tube.
4. The power anti-reverse connection protection circuit of claim 3, wherein the first switching tube is a P-channel metal oxide semiconductor field effect tube.
5. The power supply anti-reverse connection protection circuit according to claim 1, wherein the second switching tube comprises: and the anode of the second parasitic diode is connected with the source electrode of the second switching tube, and the cathode of the second parasitic diode is connected with the drain electrode of the second switching tube.
6. The power supply anti-reverse connection protection circuit according to claim 5, wherein the second switching tube is an N-channel metal oxide semiconductor field effect tube.
7. The power supply anti-reverse connection protection circuit according to claim 1, wherein the resistance value of the first resistor is 330kΩ.
8. The reverse power supply protection circuit according to claim 2, wherein the resistance value of the second resistor is 100deg.C.
9. A circuit board comprising the power supply anti-reverse connection protection circuit according to any one of claims 1 to 8.
10. An electronic device comprising the circuit board of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223123192.4U CN219268494U (en) | 2022-11-23 | 2022-11-23 | Power supply reverse connection prevention protection circuit, circuit board and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223123192.4U CN219268494U (en) | 2022-11-23 | 2022-11-23 | Power supply reverse connection prevention protection circuit, circuit board and electronic equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219268494U true CN219268494U (en) | 2023-06-27 |
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ID=86854925
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223123192.4U Active CN219268494U (en) | 2022-11-23 | 2022-11-23 | Power supply reverse connection prevention protection circuit, circuit board and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219268494U (en) |
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2022
- 2022-11-23 CN CN202223123192.4U patent/CN219268494U/en active Active
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