CN210693453U - Transmitter reverse connection protection circuit - Google Patents
Transmitter reverse connection protection circuit Download PDFInfo
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- CN210693453U CN210693453U CN201921874130.2U CN201921874130U CN210693453U CN 210693453 U CN210693453 U CN 210693453U CN 201921874130 U CN201921874130 U CN 201921874130U CN 210693453 U CN210693453 U CN 210693453U
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Abstract
The utility model relates to a changer transposition protection circuit, including MOS pipe, first diode, first resistance and second resistance, the positive pole end of first diode links to each other with the positive terminal of changer, and the negative pole end links to each other with the one end of first resistance, the other end of first resistance is connected the gate terminal of MOS pipe is continuous, the drain terminal of MOS pipe links to each other with the negative pole end of changer; one end of the second resistor is connected with the grid end of the MOS tube, and the other end of the second resistor is connected with the source end of the MOS tube. The utility model discloses can not avoid the damage of changer to the ageing effect production influence of circular telegram of changer.
Description
Technical Field
The utility model relates to a transposition protection circuit especially relates to a changer transposition protection circuit.
Background
The transmitter generally needs to be electrified and aged before being used so as to improve the stability of the transmitter, and due to the reasons that the number of the transmitters which are connected with a power supply and are aged is large, the delivery time of products is short and the like, when the transmitter is connected with the power supply, workers sometimes can connect the positive electrode and the negative electrode of the power supply reversely, so that the transmitter is damaged, the cost loss is caused, and the construction period is delayed.
At present, a reverse connection protection circuit of a related transmitter usually performs reverse connection protection by connecting a reverse connection prevention diode, although the method has the advantage of low cost, the reliability of the method is poor, in addition, the reverse connection diode can generate 0.7V pipe voltage drop when conducting in the forward direction, so that the power-on aging effect of the transmitter can be possibly influenced, in addition, the method is lack of a corresponding reverse connection reminding circuit, and a reverse connection accident cannot be timely known when the reverse connection accident occurs, so that the delay of maintenance time is caused.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a changer reversal connection protection circuit is provided, can not exert an influence to the circular telegram ageing effect of changer.
The utility model provides a technical scheme that its technical problem adopted is: the transmitter reverse connection protection circuit comprises an MOS (metal oxide semiconductor) tube, a first diode, a first resistor and a second resistor, wherein the anode end of the first diode is connected with the anode end of the transmitter, the cathode end of the first diode is connected with one end of the first resistor, the other end of the first resistor is connected with the grid end of the MOS tube, and the drain end of the MOS tube is connected with the cathode end of the transmitter; one end of the second resistor is connected with the grid end of the MOS tube, and the other end of the second resistor is connected with the source end of the MOS tube.
The MOS tube is an N-channel patch field effect tube.
The first resistor and the second resistor are chip resistors, and the resistance values of the first resistor and the second resistor are equal.
The first diode is a rectifier diode.
The transmitter reverse connection protection circuit further comprises a third resistor and a light-emitting diode, one end of the third resistor is connected with the positive end of the transmitter, the other end of the third resistor is connected with the cathode end of the light-emitting diode, and the anode end of the light-emitting diode is connected with the cathode end of the transmitter.
The third resistor is a chip resistor, and the resistance value of the third resistor is greater than the resistance values of the first resistor and the second resistor.
The transmitter reverse connection protection circuit further comprises a second diode, a fourth resistor and a buzzer, wherein the cathode end of the second diode is connected with the anode end of the transmitter, the anode end of the second diode is connected with one end of the fourth resistor, the other end of the fourth resistor is connected with one end of the buzzer, and the other end of the buzzer is connected with the cathode end of the transmitter.
The second diode is a rectifier diode.
The fourth resistor is a chip resistor, and the resistance value of the fourth resistor is greater than the resistance values of the first resistor and the second resistor.
The buzzer is an active patch buzzer.
Advantageous effects
Since the technical scheme is used, compared with the prior art, the utility model, have following advantage and positive effect: the utility model discloses a MOS pipe Q1 realizes the transposition protection, when taking place the transposition accident, can in time cut off the power supply input to avoid the changer to damage. When the reverse connection accident is relieved, the normal power supply can be automatically recovered, and the working efficiency is high. The utility model discloses still trigger the mode through emitting diode and active buzzer's audible-visual annunciation and carry out the reversal warning to can remind the user in time when the reversal fast and carry out the incident processing, avoid the reversal accident to cause the damage to changer equipment.
Drawings
Fig. 1 is a circuit diagram of an embodiment of the present invention;
fig. 2 is a schematic diagram of the current flow in the normal operation of the transmitter according to the embodiment of the present invention;
fig. 3 is a schematic view of a current flow when a reverse connection accident occurs in the transmitter according to the embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.
The utility model discloses an embodiment relates to a changer transposition protection circuit, as shown in FIG. 1, including resistance R1, the positive terminal of input changer and diode D1's negative pole end are connected to resistance R1's one end, red emitting diode L1's negative pole end is connected to resistance R1's the other end, the negative pole end of input changer is connected to red emitting diode L1's positive pole end, diode D1's positive pole end connecting resistance R2's one end, buzzer LS 1's one end is connected to resistance R2's the other end, the negative pole end of input changer is connected to buzzer LS 1's the other end. The circuit further comprises a diode D2 and a MOS tube Q1, wherein the anode end of the diode D2 is connected with the anode end of the transmitter, the cathode end of the diode D2 is connected with one end of a resistor R3, the other end of the resistor R3 is connected with the gate end of the MOS tube Q1 and one end of a resistor R4, the other end of the resistor R4 is connected with the source end of the MOS tube Q1, and the drain end of the MOS tube Q1 is connected with the cathode end of the transmitter.
In this embodiment, the buzzer LS1 may be an MLT-4020H active patch buzzer, which has a size of 4 × 2mm and a rated operating voltage of 3V. The red light emitting diode L1 can be 0603 patch light emitting diode with working voltage of 1.5-3.6V. The MOS transistor Q1 may be an N-channel chip fet, which is model No. 2N 7002. The resistor R1, the resistor R2, the resistor R3 and the resistor R4 can adopt chip resistors with parameters of 1K omega, 2K omega, 100 omega and 100 omega respectively. The diode D1 and the diode D2 may be rectifier diodes, which are IN 4001.
The working principle of the transmitter reverse connection protection circuit of the embodiment is as follows:
when the transmitter is correctly connected with the power supply, the power supply normally inputs, as shown in fig. 2, current flows into the negative terminal of the power supply after flowing through the diode D2, the resistor R3 and the resistor R4 from the positive pole of the power supply, the voltage Vgs between the gate and the source of the MOS transistor Q1 is 11V (the voltage division action of the resistor R4), the voltage is greater than the starting voltage of the MOS transistor Q1, so the MOS transistor Q1 is turned on, current flows into the negative terminal of the power supply after flowing through the transmitter from the positive pole of the power supply, and the transmitter normally operates. Meanwhile, due to the reverse blocking effect of the red light emitting diode L1 and the diode D1, no current flows through the branch where the red light emitting diode L1 and the diode D1 are located.
When the positive electrode and the negative electrode of the transmitter are reversely connected, as shown in fig. 3, because the voltage Vgs between the grid electrode and the source electrode of the MOS transistor Q1 is less than 0V, the MOS transistor Q1 stops conducting, no power supply is input at the two ends of the transmitter, the transmitter stops working, and the input of the power supply is cut off in time in the whole process, so that the electrifying aging effect of the transmitter is not affected. At the moment, one path of current flows into the negative end of the power supply from the positive electrode of the power supply after flowing through the red light-emitting diode L1 and the resistor R1, and the other path of current flows into the negative end of the power supply from the power supply after flowing through the buzzer LS1, the resistor R2 and the diode D1, and as the current flows through the buzzer LS1 and the red light-emitting diode L1, the buzzer LS1 buzzes, the red light-emitting diode L1 emits light, and a user is reminded of a reverse connection accident in an audible and visual alarm mode, so that the transmitter is protected quickly.
It is not difficult to discover, the utility model discloses a circuit has advantages such as the circuit is simple, with low costs, safe and reliable, realizes the transposition protection through MOS pipe Q1, when taking place the transposition accident, can in time cut off the power supply input, can not exert an influence to the circular telegram ageing effect of changer to avoid the changer to damage. When the reverse connection accident is relieved, the normal power supply can be automatically recovered, and the working efficiency is high. The utility model discloses still trigger the mode through emitting diode and active buzzer's audible-visual annunciation and carry out the reversal warning to can remind the user in time when the reversal fast and carry out the incident processing, avoid the reversal accident to cause the damage to changer equipment.
Claims (10)
1. A transmitter reverse connection protection circuit comprises an MOS tube, a first diode, a first resistor and a second resistor, and is characterized in that the anode end of the first diode is connected with the anode end of the transmitter, the cathode end of the first diode is connected with one end of the first resistor, the other end of the first resistor is connected with the gate end of the MOS tube, and the drain end of the MOS tube is connected with the cathode end of the transmitter; one end of the second resistor is connected with the grid end of the MOS tube, and the other end of the second resistor is connected with the source end of the MOS tube.
2. The reverse transmitter protection circuit of claim 1, wherein the MOS transistor is an N-channel patch fet.
3. The transmitter reverse-connection protection circuit of claim 1, wherein the first resistor and the second resistor are chip resistors, and the first resistor and the second resistor have equal resistance values.
4. The transmitter reverse-connect protection circuit of claim 1, wherein the first diode is a rectifier diode.
5. The transmitter reverse connection protection circuit of claim 1, further comprising a third resistor and a light emitting diode, wherein one end of the third resistor is connected to the positive terminal of the transmitter, the other end of the third resistor is connected to the cathode terminal of the light emitting diode, and the anode terminal of the light emitting diode is connected to the negative terminal of the transmitter.
6. The transmitter reverse-connection protection circuit of claim 5, wherein the third resistor is a chip resistor, and the third resistor has a resistance value greater than the resistance values of the first resistor and the second resistor.
7. The reverse connection protection circuit of the transmitter according to claim 1, further comprising a second diode, a fourth resistor and a buzzer, wherein a cathode terminal of the second diode is connected to an anode terminal of the transmitter, an anode terminal of the second diode is connected to one end of the fourth resistor, the other end of the fourth resistor is connected to one end of the buzzer, and the other end of the buzzer is connected to a cathode terminal of the transmitter.
8. The transmitter reverse-connect protection circuit of claim 7, wherein the second diode is a rectifier diode.
9. The transmitter reverse-connection protection circuit of claim 7, wherein the fourth resistor is a chip resistor, and the fourth resistor has a resistance value greater than the resistance values of the first resistor and the second resistor.
10. The transmitter reverse-connection protection circuit of claim 7, wherein the buzzer is an active patch buzzer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921874130.2U CN210693453U (en) | 2019-10-31 | 2019-10-31 | Transmitter reverse connection protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921874130.2U CN210693453U (en) | 2019-10-31 | 2019-10-31 | Transmitter reverse connection protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210693453U true CN210693453U (en) | 2020-06-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921874130.2U Active CN210693453U (en) | 2019-10-31 | 2019-10-31 | Transmitter reverse connection protection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210693453U (en) |
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2019
- 2019-10-31 CN CN201921874130.2U patent/CN210693453U/en active Active
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