CN221240134U - Reverse connection preventing circuit with reverse flow preventing function - Google Patents
Reverse connection preventing circuit with reverse flow preventing function Download PDFInfo
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- CN221240134U CN221240134U CN202322930695.0U CN202322930695U CN221240134U CN 221240134 U CN221240134 U CN 221240134U CN 202322930695 U CN202322930695 U CN 202322930695U CN 221240134 U CN221240134 U CN 221240134U
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- 230000002265 prevention Effects 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 14
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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Abstract
The utility model discloses an anti-reverse connection circuit with an anti-reverse connection function, which comprises a power input end, an anti-reverse connection control protection circuit and a power output end. The power input end is used for being connected to an external power supply; the reverse connection prevention control protection circuit is used for cutting off the circuit under the condition that the polarity of the power supply is reverse, and not supplying power to the rear-stage system, but can normally supply power to the rear-stage system under the condition that the polarity is correct. The anti-backflow control protection circuit is used for preventing current of the rear stage from flowing backwards to the front stage after the front stage is powered off; when the front stage supplies power normally, the current can smoothly supply power to the rear stage, and the high-current power supply of the rear stage is supported; the power output end is used for being connected to a rear-stage system and used for supplying power to rear-stage equipment. The utility model can avoid damaging the post-stage circuit under the condition of reverse power supply connection and can prevent current from flowing backward from the output stage to the input stage.
Description
Technical Field
The utility model relates to the field of power supply protection, in particular to an anti-reverse connection circuit with an anti-reverse current function.
Background
In the existing electronic circuit system, the situation that a user connects the polarity of a power supply reversely often occurs, if the system fails and cannot be started up, if the system fails, the whole system is burnt out, and immeasurable loss is caused. In addition, for some high-power supply systems, in order to maintain stability of the whole system, large-capacity capacitors are often connected in parallel, the capacitors store more electric energy, after the current-stage power supply is powered off, the large-capacity capacitors are not powered off immediately, the electric energy of the large-capacity capacitors is often kept for a period of time, if the anti-backflow function is not available, the electric energy can flow back to the previous-stage power supply system, logic errors of the previous-stage power supply system are caused, and even permanent damage of an integrated circuit chip in the previous-stage power supply system is caused.
Disclosure of utility model
The utility model aims to solve the technical problem of providing a reverse connection preventing circuit with a reverse connection preventing function, which can prevent a later-stage circuit from being damaged under the condition of reverse connection of a power supply and prevent current from flowing backward from an output stage to an input stage.
In order to solve the technical problems, the utility model adopts the following technical scheme: 1. reverse connection preventing circuit with reverse flow preventing function, which is characterized in that: the anti-backflow protection circuit comprises an MOS tube Q1, wherein the anti-backflow protection circuit comprises MOS tubes Q2 and Q3 and a triode Q4, the drain electrode of the MOS tube Q1 is connected with a power input end, the power input end is connected with an external power supply, the source electrode of the MOS tube Q1 is respectively connected to the base electrode of the triode Q4 and the drain electrode of the MOS tube Q2, and the grid electrode of the MOS tube Q1 is grounded; the source of the MOS tube Q2 is connected to the source of the MOS tube Q3, the other source of the MOS tube Q2 is connected to the collector of the triode Q4 through the divider resistors R1 and R4 connected in series, the emitter of the triode Q4 is grounded, the drain of the MOS tube Q3 is connected to the power output end, and the grids of the MOS tubes Q2 and Q3 are respectively connected between the divider resistors R1 and R4.
Further, an input filter capacitor C1 is disposed between the drain of the MOS transistor Q1 and ground.
Further, the reverse connection prevention protection single circuit further comprises voltage dividing resistors R2 and R3, the voltage dividing resistor R2 is connected between the source electrode and the grid electrode of the MOS tube Q1, and the voltage dividing resistor R3 is connected between the grid electrode and the ground of the MOS tube Q1.
Further, an output filter capacitor C2 is connected between the drain of the transistor Q3 and ground.
Further, the anti-backflow protection circuit further comprises voltage dividing resistors R5 and R6, the voltage dividing resistor R5 is connected between the source electrode of the MOS transistor Q1 and the base electrode of the triode Q4, and the voltage dividing resistor R6 is connected between the base electrode of the triode Q4 and the ground.
Further, the transistor Q4 is an NPN transistor.
The utility model has the beneficial effects that: the utility model comprises a reverse connection preventing protection circuit and a reverse flow preventing protection circuit, can avoid damaging a later-stage circuit under the condition of reverse connection of a power supply, can prevent current from flowing backward from an output stage to an input stage, has lower equivalent resistance value of the whole protection circuit, can not generate larger heat when the current passes, and can realize large-current and high-power application when the power is supplied to the later stage.
Drawings
FIG. 1 is a schematic block diagram of the present utility model;
Fig. 2 is a schematic circuit diagram of the present utility model.
Detailed Description
The utility model will be further described with reference to the drawings and the specific examples.
Example 1
The embodiment discloses a reverse connection preventing circuit with a reverse flow preventing function, which comprises a power input end, a reverse connection preventing protecting circuit, a reverse flow preventing protecting circuit and a power output end as shown in fig. 1. The power input end is used for being connected to an external power supply; the reverse connection preventing protection circuit is used for cutting off the circuit under the condition that the polarity of the power supply is reversed, and not supplying power to the rear-stage system, but can normally supply power to the rear-stage system under the condition that the polarity is correct. The anti-backflow protection circuit is used for preventing current of the rear stage from flowing backwards to the front stage after the front stage is powered off; and when the front stage supplies power normally, the current can smoothly supply power to the rear stage, and the high-current power supply of the rear stage is supported. The power output end is used for being connected to a rear-stage system and used for supplying power to rear-stage equipment.
The specific circuit structure is shown in fig. 2, the power input end is J1, and the power output end is J2.
The reverse connection prevention control protection circuit comprises a capacitor C1, a resistor R2, a resistor R3 and a MOS tube Q1. The anti-backflow control protection circuit comprises a resistor R5, a resistor R6, an NPN triode Q4, a resistor R1, a resistor R4, a MOS tube Q2, a MOS tube Q3 and a capacitor C2.
The drain electrode of the MOS tube Q1 is connected with a power input end, the power input end is connected with an external power supply, the source electrode of the MOS tube Q1 is respectively connected to the base electrode of the triode Q4 and the drain electrode of the MOS tube Q2, and the grid electrode of the MOS tube Q1 is grounded. The capacitor C1 is an input filter capacitor and is connected between the drain electrode of the MOS transistor Q1 and the ground. The resistor R2 and the resistor R3 are voltage dividing resistors, the resistor R2 is connected between the source electrode and the grid electrode of the MOS tube Q1, and the resistor R3 is connected between the grid electrode and the ground of the MOS tube Q1.
The drain electrode of the MOS tube Q2 is connected with the source electrode of the MOS tube, one path of the source electrode of the MOS tube Q2 is connected with the source electrode of the MOS tube Q3, the other path of the source electrode of the MOS tube Q2 is connected with the collector electrode of the triode Q4 through the voltage dividing resistors R1 and R4 which are connected in series, the emitter electrode of the triode Q4 is grounded, the drain electrode of the MOS tube Q3 is connected with the power output end, and the grid electrodes of the MOS tubes Q2 and Q3 are respectively connected between the voltage dividing resistors R1 and R4. The capacitor C2 is an output filter capacitor, and is connected between the drain of the diode Q3 and ground. The resistors R5 and R6 are voltage dividing resistors, the resistor R5 is connected between the source electrode of the MOS transistor Q1 and the base electrode of the triode Q4, and the resistor R6 is connected between the base electrode of the triode Q4 and the ground.
The working principle of the utility model is as follows: when the polarity of the power supply is connected correctly, the resistors R2 and R3 divide the voltage normally, the MOS tube Q1 is conducted normally, and the source electrode S of the MOS tube Q1 outputs the voltage normally; when the polarity of the power supply is connected in error, the MOS tube Q1 is not conducted, and the source electrode S of the MOS tube Q1 has no output voltage, so that a later-stage circuit is protected.
When the polarity of the power supply is connected normally, the reverse connection prevention control protection circuit works normally, the drain electrode D of the MOS tube Q2 has voltage, the triode Q4 is normally conducted at the moment, the resistors R1 and R4 are normally divided, the MOS tubes Q2 and Q3 are in a conducting state at the moment, then the J2 is provided with normal voltage output, and further the rear stage is normally powered, and the conducted resistance value is very small because the Q1, Q2 and Q3 are the MOS tubes, so that the requirement of the rear stage on-state heavy current power supply can be met; after the VCC_IN of the current stage is powered off, even if the voltage of VCC_OUT still exists, the triode Q4 cannot be conducted, and the MOS transistors Q2 and Q3 cannot be conducted; because the body diodes of the MOS transistors Q2 and Q3 are also in reverse series connection, the body diodes cannot be conducted, so that VCC_OUT cannot flow backward to the drain electrode D of the MOS transistor Q2 at the moment, a power supply system of a front stage cannot be affected, and the function of preventing current from flowing backward is achieved.
The foregoing description is only of the basic principles and preferred embodiments of the present utility model, and modifications and alternatives thereto will occur to those skilled in the art to which the present utility model pertains, as defined by the appended claims.
Claims (6)
1. Reverse connection preventing circuit with reverse flow preventing function, which is characterized in that: the anti-backflow protection circuit comprises an MOS tube Q1, wherein the anti-backflow protection circuit comprises MOS tubes Q2 and Q3 and a triode Q4, the drain electrode of the MOS tube Q1 is connected with a power input end, the power input end is connected with an external power supply, the source electrode of the MOS tube Q1 is respectively connected to the base electrode of the triode Q4 and the drain electrode of the MOS tube Q2, and the grid electrode of the MOS tube Q1 is grounded; the source of the MOS tube Q2 is connected to the source of the MOS tube Q3, the other source of the MOS tube Q2 is connected to the collector of the triode Q4 through the divider resistors R1 and R4 connected in series, the emitter of the triode Q4 is grounded, the drain of the MOS tube Q3 is connected to the power output end, and the grids of the MOS tubes Q2 and Q3 are respectively connected between the divider resistors R1 and R4.
2. The reverse connection preventing circuit with a reverse flow preventing function according to claim 1, wherein: an input filter capacitor C1 is arranged between the drain electrode of the MOS tube Q1 and the ground.
3. The reverse connection preventing circuit with a reverse flow preventing function according to claim 1, wherein: the reverse connection prevention protection single circuit further comprises voltage dividing resistors R2 and R3, wherein the voltage dividing resistor R2 is connected between the source electrode and the grid electrode of the MOS tube Q1, and the voltage dividing resistor R3 is connected between the grid electrode and the ground of the MOS tube Q1.
4. The reverse connection preventing circuit with a reverse flow preventing function according to claim 1, wherein: an output filter capacitor C2 is connected between the drain electrode of the triode Q3 and the ground.
5. The reverse connection preventing circuit with a reverse flow preventing function according to claim 1, wherein: the anti-backflow protection circuit further comprises divider resistors R5 and R6, wherein the divider resistor R5 is connected between the source electrode of the MOS transistor Q1 and the base electrode of the triode Q4, and the divider resistor R6 is connected between the base electrode of the triode Q4 and the ground.
6. The reverse connection preventing circuit with a reverse flow preventing function according to claim 1, wherein: the triode Q4 is an NPN triode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322930695.0U CN221240134U (en) | 2023-10-31 | 2023-10-31 | Reverse connection preventing circuit with reverse flow preventing function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322930695.0U CN221240134U (en) | 2023-10-31 | 2023-10-31 | Reverse connection preventing circuit with reverse flow preventing function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221240134U true CN221240134U (en) | 2024-06-28 |
Family
ID=91616097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322930695.0U Active CN221240134U (en) | 2023-10-31 | 2023-10-31 | Reverse connection preventing circuit with reverse flow preventing function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221240134U (en) |
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2023
- 2023-10-31 CN CN202322930695.0U patent/CN221240134U/en active Active
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