CN215934472U - Power and signal interface hot plug protection circuit - Google Patents
Power and signal interface hot plug protection circuit Download PDFInfo
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- CN215934472U CN215934472U CN202121825681.7U CN202121825681U CN215934472U CN 215934472 U CN215934472 U CN 215934472U CN 202121825681 U CN202121825681 U CN 202121825681U CN 215934472 U CN215934472 U CN 215934472U
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Abstract
The utility model discloses a hot plug protection circuit for a power supply and signal interface, which comprises a resistor R1, a resistor R2, a Mosfet and a diode D1, wherein the anode input end of a plug-in power supply is connected with the source electrode of the Mosfet, the resistor R1 is connected with the source electrode and two ends of the grid electrode of the Mosfet, one end of the resistor R2 is connected with the grid electrode of the Mosfet, the other end of the resistor R2 is connected with 0V, and the cathode of the diode D1 is connected with 0V.
Description
Technical Field
The utility model belongs to the technical field of electronic circuits, and particularly relates to a hot plug protection circuit for a power supply and a signal interface.
Background
Some electronic modules need to be frequently plugged and unplugged, the plugged and unplugged interfaces comprise power lines and signal lines, and if the positive pole of a power supply and the signal lines are connected firstly and then connected after 0V when being plugged, or the negative pole is separated firstly when the terminal is unplugged, the electronic modules are possibly damaged. To avoid this, it is usually troublesome to first power off and then insert and then supply power, or to first insert the negative pole and then insert the signal power supply.
SUMMERY OF THE UTILITY MODEL
In order to solve the problems, the utility model provides a hot plug protection circuit for a power supply and a signal interface, which avoids the problem of circuit module damage caused by 0V later connection or 0V first disconnection during hot plug.
In order to realize the functions, the technical scheme adopted by the utility model is as follows: a power supply and signal interface hot plug protection circuit comprises a resistor R1, a resistor R2, a Mosfet and a diode D1, wherein the positive input end of a plug-in power supply is connected with the source electrode of the Mosfet, the resistor R1 is connected with the source electrode and two ends of the grid electrode of the Mosfet, one end of the resistor R2 is connected with the grid electrode of the Mosfet, the other end of the resistor R2 is connected with 0V, and the cathode of the diode D1 is connected with 0V; when the positive electrodes V + and 0V of the plug-in are connected, the Mosfet is conducted to output positive voltage, and a loop is formed by the diode D1 to supply power to the circuit module, when the 0V is not connected, the Q1 cannot be conducted, the positive electrode of the power supply cannot supply power abnormally to the circuit module through signals and other loops, and the circuit module cannot be damaged.
Further, the Mosfet is a P-channel Mosfet.
The utility model adopts the structure to obtain the following beneficial effects: the hot plug protection circuit for the power supply and the signal interface is simple to operate, compact in mechanism and reasonable in design, the main body part of the circuit consists of two resistors, a P-channel Mosfet and a diode, the pin 1 of the plug-in is the positive input end of the power supply and is connected with the source electrode of the Mosfet, R1 is connected with two ends of the source electrode and the grid electrode, one end of R2 is connected with the grid electrode, the other end of the R2 is connected with 0V, the cathode of the diode D1 is connected with 0V, when the positive electrodes V + and 0V of the plug-in are connected, the Mosfet is conducted to output positive voltage, and a loop is formed by the diode D1 to supply power to a circuit module. When 0V is not accessed, Q1 can not be conducted, the positive pole of the power supply can not supply power to the circuit module abnormally through signals and other loops, and the circuit module can not be damaged.
Drawings
Fig. 1 is a circuit diagram of a hot plug protection circuit for power and signal interfaces according to the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being 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 invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the hot plug protection circuit for power and signal interfaces of the present invention includes a resistor R1, a resistor R2, a Mosfet, and a diode D1, wherein the positive input terminal of the plug-in power supply is connected to the source of the Mosfet, the resistor R1 is connected to both ends of the source and the gate of the Mosfet, one end of the resistor R2 is connected to the gate of the Mosfet, the other end of the resistor R2 is connected to 0V, and the cathode of the diode D1 is connected to 0V.
The Mosfet is a P-channel Mosfet.
When the circuit is used specifically, the main body part of the circuit consists of two resistors, a P-channel Mosfet and a diode, the pin 1 of the plug-in is the positive input end of a power supply and is connected with the source electrode of the Mosfet, R1 is connected with two ends of the source electrode and the grid electrode, one end of R2 is connected with the grid electrode, the other end of the R2 is connected with 0V, the cathode of the diode D1 is connected with 0V, when the positive electrodes V + and 0V of the plug-in are both connected, the Mosfet is conducted to output positive voltage, and a loop is formed by the diode D1 to supply power to the circuit module. When 0V is not accessed, Q1 can not be conducted, the positive pole of the power supply can not supply power to the circuit module abnormally through signals and other loops, and the circuit module can not be damaged.
The present invention and its embodiments have been described above, and the description is not intended to be limiting, and the drawings are only one embodiment of the present invention, and the actual structure is not limited thereto. In summary, those skilled in the art should appreciate that they can readily use the disclosed conception and specific embodiments as a basis for designing or modifying other structures for carrying out the same purposes of the present invention without departing from the spirit and scope of the utility model as defined by the appended claims.
Claims (2)
1. The utility model provides a power and signal interface hot plug protection circuit which characterized in that: the power supply comprises a resistor R1, a resistor R2, a Mosfet and a diode D1, wherein the input end of the positive pole of the power supply is connected with the source electrode of the Mosfet, the resistor R1 is connected with the two ends of the source electrode and the grid electrode of the Mosfet, one end of the resistor R2 is connected with the grid electrode of the Mosfet, the other end of the resistor R2 is connected with 0V, and the cathode of the diode D1 is connected with 0V.
2. A power and signal interface hot plug protection circuit as claimed in claim 1, wherein: the Mosfet is a P-channel Mosfet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121825681.7U CN215934472U (en) | 2021-08-06 | 2021-08-06 | Power and signal interface hot plug protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121825681.7U CN215934472U (en) | 2021-08-06 | 2021-08-06 | Power and signal interface hot plug protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215934472U true CN215934472U (en) | 2022-03-01 |
Family
ID=80399729
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121825681.7U Active CN215934472U (en) | 2021-08-06 | 2021-08-06 | Power and signal interface hot plug protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215934472U (en) |
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2021
- 2021-08-06 CN CN202121825681.7U patent/CN215934472U/en active Active
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