CN218868210U - PMOS over-current protection control circuit - Google Patents
PMOS over-current protection control circuit Download PDFInfo
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- CN218868210U CN218868210U CN202223471054.5U CN202223471054U CN218868210U CN 218868210 U CN218868210 U CN 218868210U CN 202223471054 U CN202223471054 U CN 202223471054U CN 218868210 U CN218868210 U CN 218868210U
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- pmos pipe
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Abstract
The utility model discloses a PMOS overcurrent protection control circuit, MCU passes through resistance R6 and is connected with triode Q4's base, triode Q4's collecting electrode passes through resistance R5 and is connected with PMOS pipe Q3 grid, PMOS pipe Q3's source electrode passes through diode D1 and connects power supply ACC, PMOS pipe Q3's drain electrode passes through resistance R1 and connects the power VCC, the power VCC passes through resistance R3 and is connected with PMOS pipe Q3's grid, resistance R3 goes up and has connect diode D2, PMOS pipe Q3's grid is connected with triode Q2's projecting pole, triode Q2's collecting electrode passes through resistance R2 and is connected with PMOS pipe Q3's drain electrode, it has resistance R4 to connect between triode Q2's base and the projecting pole, triode Q2's base is connected with triode Q1's collecting electrode, triode Q1's base is connected with triode Q2's collecting electrode, it has electric capacity C1 to connect between triode Q1's projecting pole and the base. The utility model has the advantages that: the PMOS overcurrent protection function is achieved, and the MOS tube can be timely turned off when the power output end is in overcurrent, so that the power output is timely turned off.
Description
Technical Field
The utility model relates to the technical field of circuits, specifically indicate a PMOS over-current protection control circuit.
Background
Along with the intelligent development of two wheeler, mechanical key is gradually replaced by electronic device (MOS pipe), and not few cars all adopt the mode of exempting from the key to start now, reduces the vexation that the user took the key every day, but the car is through long-term the back of using of user, and not few electronic accessories can produce ageing, leads to the load to overflow, brings the injury of damage for electronic starting part, and the damage of power starting part directly leads to the unable normal use of car of user.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is, to above-mentioned problem, provide a PMOS over-current protection control circuit that has PMOS over-current protection function, can in time turn off the MOS pipe when satisfying power output end and overflowing and let power output in time turn off.
In order to solve the technical problem, the utility model provides a technical scheme does: the utility model provides a PMOS overcurrent protection control circuit, includes MCU and PMOS pipe Q3, MCU passes through resistance R6 and is connected with triode Q4's base, it has resistance R8 to connect between triode Q4's the base and the projecting pole, triode Q4's collecting electrode passes through resistance R5 and is connected with PMOS pipe Q3 grid, PMOS pipe Q3's source electrode passes through diode D1 and connects power supply ACC, PMOS pipe Q3's drain electrode passes through resistance R1 and connects the power VCC, the power VCC passes through resistance R3 and is connected with PMOS pipe Q3's grid, it has diode D2 to go up and to have the hookup on the resistance R3, PMOS pipe Q3's grid and triode Q2's projecting pole are connected, triode Q2's collecting electrode passes through resistance R2 and is connected with PMOS pipe Q3's drain electrode, it has resistance R4 to connect between triode Q2's the base and the projecting pole, triode Q2's base and triode Q1's collecting electrode are connected, triode Q2's the base is connected with triode Q2's collecting electrode, triode Q1's projecting pole and power are connected, it has electric capacity C1 to connect between base.
Further, the diode D2 is connected to a resistor R4.
Further, the capacitor C1 is connected to the collector of the transistor Q2.
Further, the emitter of the transistor Q4 is grounded.
Compared with the prior art, the utility model the advantage lie in: one end of the power tube is connected with the input end of the power tube, and the other end of the power tube is connected with the power supply. When the output end of the power tube is in overcurrent, the current detection resistor on the main circuit instantly obtains voltage at the moment of power tube output, the GS voltage difference of the PMOS tube is changed into 0V by switching on the triode, the PMOS tube is prevented from being damaged due to overcurrent, the safety of the device can be effectively protected under the condition of load overcurrent, and the fire accident caused by overcurrent is also reduced.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
It should be noted that all the directional indicators in the embodiments of the present invention, such as up, down, left, right, front, back, 82308230, are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture as shown in the drawings, and if the specific posture is changed, the directional indicator is changed accordingly.
Furthermore, descriptions in the present application as to "first," "second," etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The invention will now be further described with reference to the accompanying drawings.
Combine attached figure 1, MCU passes through resistance R6 and is connected with triode Q4's base, it has resistance R8 to connect between triode Q4's the base and the projecting pole, triode Q4's projecting pole ground connection, triode Q4's collecting electrode passes through resistance R5 and is connected with PMOS pipe Q3 grid, PMOS pipe Q3's source electrode passes through diode D1 and connects power supply ACC, PMOS pipe Q3's drain electrode passes through resistance R1 and connects the power VCC, the power VCC passes through resistance R3 and is connected with PMOS pipe Q3's grid, the last hookup of resistance R3 has diode D2, PMOS pipe Q3's grid and triode Q2's projecting pole are connected, triode Q2's collecting electrode passes through resistance R2 and is connected with PMOS pipe Q3's drain electrode, it has resistance R4 to connect between triode Q2's the base and the projecting pole, diode D2 is connected with resistance R4, triode Q2's base and triode Q1's collecting electrode are connected, triode Q1's base and triode Q2's projecting pole are connected, triode Q1's projecting pole and power VCC are connected, the base and the electric capacity C1 is connected between triode Q1 and the collecting electrode.
When the MCU output is at a high level, the triode Q4 is switched on through the current-limiting resistor R6, the PMOS tube Q3 is switched on after the Q4 is switched on, C1 is charged firstly after the Q3 is switched on, the current is output through R1 after the C1 is charged, when the current flows through R1, the voltage drop can be established at the two ends of R1, when the voltage drop exceeds 0.6V, the Q1 triode is switched on, the Q2 triode is switched on, and VCC power voltage is loaded to the grid electrode of the PMOS tube through Q1 and Q2, so that the PMOS tube is switched off. Use this patent technical scheme in the aspect of the keyless start of electric motor car power, have overcurrent protection's effect.
The present invention has been described in connection with the embodiments thereof, and the description is not intended to be limiting, and the embodiments shown in the drawings are only one of the embodiments of the present invention, and the actual structure is not limited thereto. In summary, it should be understood that those skilled in the art should also understand the scope of the present invention without inventively designing the similar structure and embodiments of the present invention without departing from the spirit of the present invention.
Claims (4)
1. The utility model provides a PMOS overcurrent protection control circuit, includes MCU and PMOS pipe Q3, its characterized in that: MCU passes through resistance R6 and is connected with triode Q4's base, it has resistance R8 to connect between triode Q4's base and the projecting pole, triode Q4's collecting electrode passes through resistance R5 and is connected with PMOS pipe Q3 grid, PMOS pipe Q3's source electrode passes through diode D1 and connects power supply ACC, PMOS pipe Q3's drain electrode passes through resistance R1 and connects the power VCC, the power VCC passes through resistance R3 and is connected with PMOS pipe Q3's grid, resistance R3 is last to be connected with diode D2, PMOS pipe Q3's grid and triode Q2's projecting pole are connected, triode Q2's collecting electrode passes through resistance R2 and is connected with PMOS pipe Q3's drain electrode, it has resistance R4 to connect between triode Q2's base and the projecting pole, triode Q2's base and triode Q1's collecting electrode are connected, triode Q1's base and triode Q2's collecting electrode are connected, triode Q1's projecting pole and power VCC are connected, it has electric capacity C1 to connect between triode Q1's projecting pole and base.
2. The PMOS over-current protection control circuit of claim 1, wherein: the diode D2 is connected to the resistor R4.
3. The PMOS over-current protection control circuit of claim 1, wherein: and the capacitor C1 is connected with the collector of the triode Q2.
4. The PMOS over-current protection control circuit of claim 1, wherein: the emitter of the triode Q4 is grounded.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223471054.5U CN218868210U (en) | 2022-12-26 | 2022-12-26 | PMOS over-current protection control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223471054.5U CN218868210U (en) | 2022-12-26 | 2022-12-26 | PMOS over-current protection control circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218868210U true CN218868210U (en) | 2023-04-14 |
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ID=87355810
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223471054.5U Active CN218868210U (en) | 2022-12-26 | 2022-12-26 | PMOS over-current protection control circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218868210U (en) |
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2022
- 2022-12-26 CN CN202223471054.5U patent/CN218868210U/en active Active
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