CN218563861U - Water pump driving circuit - Google Patents
Water pump driving circuit Download PDFInfo
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- CN218563861U CN218563861U CN202223090484.2U CN202223090484U CN218563861U CN 218563861 U CN218563861 U CN 218563861U CN 202223090484 U CN202223090484 U CN 202223090484U CN 218563861 U CN218563861 U CN 218563861U
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Abstract
The utility model discloses a water pump drive circuit, it includes: the master control circuit comprises an MOS tube driving circuit and an MCU, and the MOS tube driving circuit is connected with the MCU and the water pump so as to drive a motor of the water pump to work under the control of the MCU; the water level detection circuit comprises a voltage division circuit and a twenty-third resistor, wherein the input end of the voltage division circuit is connected with the output end of the MOS tube driving circuit, and the output end of the voltage division circuit is connected with the MCU through the twenty-third resistor to output a detection signal to the MCU, so that the MCU realizes water level detection according to the waveform of the detection signal when the water pump stops working. Compared with the prior art, the utility model discloses water pump drive circuit accessible detects water pump stop work time back electromotive force's time length realizes water tank water level detection, simple structure, and the cost is lower.
Description
Technical Field
The utility model relates to a water pump drive circuit.
Background
Some water pump products need to detect whether the water tank has water or is empty when working, most of the existing water pump products adopt a water level sensor or a Hall sensor arranged in the water tank to detect the water level, and the water level is judged through the obtained high and low level signals or flow pulse signals, although the scheme is feasible, the cost is higher.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that a water pump drive circuit is provided, can realize the water level detection, and the cost is lower.
In order to solve the technical problem, the utility model provides a water pump driving circuit, include:
the main control circuit comprises an MOS tube driving circuit and an MCU, wherein the MOS tube driving circuit is connected with the MCU and the water pump so as to drive a motor of the water pump to work under the control of the MCU;
the water pump driving circuit comprises a voltage division circuit and a twenty-third resistor, wherein the input end of the voltage division circuit is connected with the output end of the MOS tube driving circuit, and the output end of the voltage division circuit is connected with the MCU through the twenty-third resistor so as to output a detection signal to the MCU, so that the MCU realizes water level detection according to the waveform of the detection signal when the water pump stops working.
The further technical scheme is as follows: the water level detection circuit further comprises a nineteenth capacitor, one end of the nineteenth capacitor is connected with one end of the twenty-third resistor, which is connected with the MCU, and the other end of the nineteenth capacitor is grounded.
The further technical scheme is as follows: the water pump driving circuit further comprises a sixth diode and a first magnetic bead, the sixth diode is connected with a motor of the water pump in parallel, and two ends of the first magnetic bead are respectively connected with a negative electrode of the sixth diode and an output end of the MOS tube driving circuit.
The further technical scheme is as follows: the water pump driving circuit further comprises a second magnetic bead and an inductor, one end of the second magnetic bead is connected with the anode of the sixth diode, and the other end of the second magnetic bead is grounded through the inductor.
The further technical scheme is as follows: the water pump driving circuit further comprises a fifteenth capacitor and a seventeenth capacitor, and the two ends of the fifteenth capacitor and the seventeenth capacitor which are connected in series are respectively connected with the anode and the cathode of the sixth diode.
The further technical scheme is as follows: the voltage division circuit comprises a twentieth resistor and a twenty-fourth resistor, one end of the twentieth resistor is connected with the output end of the MOS tube driving circuit, the other end of the twentieth resistor is connected with the twenty-fourth resistor and the twenty-third resistor, and the other end of the twenty-fourth resistor is grounded.
The further technical scheme is as follows: the MOS tube driving circuit comprises a first transistor, a second transistor and an MOS tube, wherein the collectors of the first transistor and the second transistor and the source electrode of the MOS tube are all connected with a power supply VCC, the base electrode of the first transistor is connected with an MCU, the collector electrode of the first transistor is also connected with the base electrode of the second transistor, the emitter electrode of the second transistor is connected with the grid electrode of the MOS tube, the drain electrode of the MOS tube is used as the output end of the MOS tube driving circuit to be connected with a motor, and the emitter electrode of the first transistor is grounded.
The further technical scheme is as follows: the MOS transistor driving circuit further comprises a seventeenth resistor and a twenty fifth resistor, the first transistor is connected with the MCU through the twenty fifth resistor, and an emitting electrode of the second transistor is connected with a grid electrode of the MOS transistor through the seventeenth resistor.
The further technical scheme is as follows: the MOS tube driving circuit further comprises a fifth diode, an eighteenth resistor and a nineteenth resistor, the collector of the first transistor is connected with the power supply VCC through the nineteenth resistor, the negative pole and the positive pole of the fifth diode are respectively connected with the base of the second transistor and the eighteenth resistor, and the other end of the eighteenth resistor is connected with the grid of the MOS tube.
Compared with the prior art, the utility model discloses be provided with water level detection circuit among the water pump drive circuit, the back electromotive force through detecting the water pump motor distinguishes the water tank whether unloaded or fully loaded, and water level detection circuit is connected in order to obtain the detected signal with MOS pipe drive circuit's output promptly, and MCU realizes water level detection according to the wave form of detected signal at the water pump stop work, and the back electromotive force duration of detected signal is longer when unloaded, can, the utility model discloses the time length of back electromotive force when the accessible detects the water pump stop work realizes water tank water level detection, simple structure, and the cost is lower.
Drawings
Fig. 1 is a schematic circuit diagram of a specific embodiment of the water pump driving circuit of the present invention.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more clearly understood by those skilled in the art, the present invention will be further described with reference to the accompanying drawings and examples.
Referring to fig. 1, fig. 1 is a schematic circuit structure diagram of a specific embodiment of the water pump driving circuit of the present invention. In the embodiment shown in the drawings, the water pump driving circuit comprises a main control circuit and a water level detection circuit 12, wherein the main control circuit comprises an MOS transistor driving circuit 111 and an MCU (not shown in the figure), and the MOS transistor driving circuit 111 is connected with the MCU and the water pump to drive a motor M of the water pump to work under the control of the MCU; the water level detection circuit 12 comprises a voltage division circuit and a twenty-third resistor R23, the input end of the voltage division circuit is connected with the output end of the MOS tube driving circuit 111, the output end of the voltage division circuit is connected with the MCU through the twenty-third resistor R23 to output a detection signal to the MCU, so that the MCU realizes water level detection according to the waveform of the detection signal when the water pump stops working. In this embodiment, the model of the MCU is CMS8S6990N. Based on the above design, water pump motor M produces the back electromotive force when driving motor M's MOS pipe is turn-offed, the utility model discloses a time length that detects water pump stop work time back electromotive force realizes water tank water level detection, and the cost is lower, AD value time length when detecting MOS pipe turn-offed among the MOS pipe drive circuit of drive water pump through water level detection circuit 12 and MCU cooperation promptly goes to judge whether the water tank is full of water or for empty, MCU judges the water tank according to detection signal's waveform duty ratio when the motor M stop work of water pump is full of or no-load promptly, when full of, the duty ratio is big, be greater than 0.5 under the common conditions.
In some embodiments, the voltage divider circuit includes a twentieth resistor R20 and a twenty-fourth resistor R24, one end of the twentieth resistor R20 is connected to the output terminal of the MOS transistor driver circuit 111, the other end of the twentieth resistor R20 is connected to the twenty-fourth resistor R24 and the twenty-third resistor R23, and the other end of the twenty-fourth resistor R24 is connected to ground. Furthermore, the water level detection circuit 12 further includes a nineteenth capacitor C19, one end of the nineteenth capacitor C19 is connected to one end of the twenty-third resistor R23 connected to the MCU, and the other end is grounded.
In some embodiments, the water pump driving circuit further includes a sixth diode D6, a first magnetic bead FB1, a second magnetic bead FB2, and an inductor L, the sixth diode D6 is connected in parallel with the motor M of the water pump, two ends of the first magnetic bead FB1 are respectively connected to a negative electrode of the sixth diode D6 and an output end of the MOS transistor driving circuit 111, one end of the second magnetic bead FB2 is connected to a positive electrode of the sixth diode D6, and the other end of the second magnetic bead FB2 is grounded through the inductor L.
Preferably, in this embodiment, the water pump driving circuit further includes a fifteenth capacitor C15 and a seventeenth capacitor C17, and two ends of the fifteenth capacitor C15 and the seventeenth capacitor C17 after being connected in series are respectively connected to the anode and the cathode of the sixth diode D6.
In some embodiments, the MOS transistor driving circuit 111 includes a first transistor Q1, a second transistor Q2, and an MOS transistor Q3, wherein collectors of the first transistor Q1 and the second transistor Q2 and a source of the MOS transistor Q3 are all connected to a power source VCC, a base of the first transistor Q1 is connected to the MCU, a collector of the first transistor Q1 is further connected to a base of the second transistor Q2, an emitter of the second transistor Q2 is connected to a gate of the MOS transistor Q3, a drain of the MOS transistor Q3 is used as an output terminal of the MOS transistor driving circuit 111 and is connected to the motor M, and an emitter of the first transistor Q1 is grounded. In this embodiment, the power VCC is an externally provided 12V reference power supply.
Further, the MOS transistor driving circuit 111 further includes a seventeenth resistor R17, a twenty fifth resistor R25, a fifth diode D5, an eighteenth resistor R18 and a nineteenth resistor R19, the base of the first transistor Q1 is connected to the MCU through the twenty fifth resistor R25, that is, the pin PUMP-ON is connected to the MCU, the twenty ninth resistor R29 is further connected between the base and the emitter of the first transistor Q1, the emitter of the second transistor Q2 is connected to the gate of the MOS transistor Q3 through the seventeenth resistor R17, the collector of the first transistor Q1 is connected to the power VCC through the nineteenth resistor R19, the cathode and the anode of the fifth diode D5 are respectively connected to the base of the second transistor Q2 and the eighteenth resistor R18, the other end of the eighteenth resistor R18 is connected to the gate of the MOS transistor Q3, and an eleventh capacitor C11 and a twelfth capacitor C12 are further connected between the source and the drain of the MOS transistor Q3.
Understandably, the utility model discloses water level detection circuit 12's collection detection frequency is once 5ms, and water pump motor M stop work, through pin AD detection water pump motor M's back electromotive force, when actually stopping, this numerical value is 0, because of AD numerical value is once sampled every 5ms, confirms back electromotive force's time length according to the number that detects to reach and judge whether empty or the full condition of water tank, the utility model discloses in, during the no-load, water pump motor M's back electromotive force is longer, when full-load, back electromotive force is shorter.
To sum up, the utility model discloses the time length through water level detection circuit, MOS pipe drive circuit and MCU cooperation detection water pump stop work time counter electromotive force among the water pump drive circuit realizes water tank water level detection, simple structure, and the cost is lower.
The foregoing is considered as illustrative of the preferred embodiments of the invention, and not as limiting the invention in any way. Various equivalent changes and modifications can be made on the embodiments by those skilled in the art, and all equivalent changes and modifications within the scope of the claims should be within the protection scope of the present invention.
Claims (9)
1. A water pump drive circuit, comprising:
the master control circuit comprises an MOS tube driving circuit and an MCU, and the MOS tube driving circuit is connected with the MCU and the water pump so as to drive a motor of the water pump to work under the control of the MCU;
the water level detection circuit comprises a voltage division circuit and a twenty-third resistor, wherein the input end of the voltage division circuit is connected with the output end of the MOS tube driving circuit, and the output end of the voltage division circuit is connected with the MCU through the twenty-third resistor to output a detection signal to the MCU, so that the MCU realizes water level detection according to the waveform of the detection signal when the water pump stops working.
2. The water pump drive circuit according to claim 1, wherein: the water level detection circuit further comprises a nineteenth capacitor, one end of the nineteenth capacitor is connected with one end of the twenty-third resistor, which is connected with the MCU, and the other end of the nineteenth capacitor is grounded.
3. The water pump drive circuit according to claim 1, wherein: the water pump driving circuit further comprises a sixth diode and a first magnetic bead, the sixth diode is connected with a motor of the water pump in parallel, and two ends of the first magnetic bead are connected with the negative electrode of the sixth diode and the output end of the MOS tube driving circuit respectively.
4. The water pump drive circuit according to claim 3, wherein: the water pump driving circuit further comprises a second magnetic bead and an inductor, one end of the second magnetic bead is connected with the anode of the sixth diode, and the other end of the second magnetic bead is grounded through the inductor.
5. The water pump drive circuit according to claim 3, wherein: the water pump driving circuit further comprises a fifteenth capacitor and a seventeenth capacitor, and the two ends of the fifteenth capacitor and the seventeenth capacitor which are connected in series are respectively connected with the anode and the cathode of a sixth diode.
6. The water pump drive circuit of claim 1, wherein: the voltage division circuit comprises a twentieth resistor and a twenty-fourth resistor, one end of the twentieth resistor is connected with the output end of the MOS tube driving circuit, the other end of the twentieth resistor is connected with the twenty-fourth resistor and the twenty-third resistor, and the other end of the twenty-fourth resistor is grounded.
7. The water pump drive circuit according to claim 1, wherein: the MOS tube driving circuit comprises a first transistor, a second transistor and an MOS tube, wherein the collectors of the first transistor and the second transistor and the source electrodes of the MOS tube are all connected with a power VCC, the base electrode of the first transistor is connected with an MCU, the collector electrode of the first transistor is also connected with the base electrode of the second transistor, the emitter electrode of the second transistor is connected with the grid electrode of the MOS tube, the drain electrode of the MOS tube is used as the output end of the MOS tube driving circuit and is connected with a motor, and the emitter electrode of the first transistor is grounded.
8. The water pump drive circuit according to claim 7, wherein: the MOS transistor driving circuit further comprises a seventeenth resistor and a twenty fifth resistor, the first transistor is connected with the MCU through the twenty fifth resistor, and an emitting electrode of the second transistor is connected with a grid electrode of the MOS transistor through the seventeenth resistor.
9. The water pump drive circuit according to claim 7, wherein: the MOS tube driving circuit further comprises a fifth diode, an eighteenth resistor and a nineteenth resistor, the collector of the first transistor is connected with the power supply VCC through the nineteenth resistor, the negative pole and the positive pole of the fifth diode are respectively connected with the base of the second transistor and the eighteenth resistor, and the other end of the eighteenth resistor is connected with the grid of the MOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223090484.2U CN218563861U (en) | 2022-11-17 | 2022-11-17 | Water pump driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223090484.2U CN218563861U (en) | 2022-11-17 | 2022-11-17 | Water pump driving circuit |
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| Publication Number | Publication Date |
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| CN218563861U true CN218563861U (en) | 2023-03-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223090484.2U Active CN218563861U (en) | 2022-11-17 | 2022-11-17 | Water pump driving circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117492396A (en) * | 2023-11-03 | 2024-02-02 | 广州技诺智能设备有限公司 | Water supply control circuit and system of coffee machine |
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2022
- 2022-11-17 CN CN202223090484.2U patent/CN218563861U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117492396A (en) * | 2023-11-03 | 2024-02-02 | 广州技诺智能设备有限公司 | Water supply control circuit and system of coffee machine |
| CN117492396B (en) * | 2023-11-03 | 2024-04-05 | 广州技诺智能设备有限公司 | Water supply control circuit and system of coffee machine |
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