CN220822941U - Low-power consumption control circuit for heat dissipation circulating water pump - Google Patents

Abstract

The MCU is electrically connected with nine field effect transistors through a pre-driving chip, each field effect transistor is an NMOS transistor and is used for controlling a first motor and a second motor of two water pumps, grid electrodes of each field effect transistor are electrically connected with the pre-driving chip, source electrodes of the first field effect transistor and drain electrodes of the fourth field effect transistor are respectively used for being connected with a current input end A1 of the first motor, source electrodes of the second field effect transistor and drain electrodes of the fifth field effect transistor are respectively used for being connected with a current input end B1 of the first motor, and source electrodes of the third field effect transistor and drain electrodes of the sixth field effect transistor are respectively used for being connected with a current input end C1 of the first motor; the source electrode of the fourth field effect tube and the drain electrode of the seventh field effect tube are both used for being connected with the current input end A2 of the second motor, the source electrode of the fifth field effect tube and the drain electrode of the eighth field effect tube are both used for being connected with the current input end B2 of the second motor, and the source electrode of the sixth field effect tube and the drain electrode of the ninth field effect tube are both used for being connected with the current input end C2 of the second motor.

Description

Low-power consumption control circuit for heat dissipation circulating water pump

Technical Field

The utility model relates to the field of automobile heat management, in particular to a low-power consumption control circuit for a heat dissipation circulating water pump.

Background

The thermal management system (THERMAL MANAGEMENT SYSTEM, TMS) of an automobile is an important part of the whole automobile system, and the development purpose of the thermal management system is mainly safety, comfort, energy conservation, economy and durability. The automobile heat management is to comprehensively integrate relevant matching, optimizing and controlling of relevant parts and subsystems such as an automobile engine, an air conditioner, a battery, a motor and the like from the whole automobile angle, so that the problem of the whole automobile heat correlation is effectively solved, each functional module is positioned in an optimal temperature working condition interval, the economy and the dynamic performance of the whole automobile are improved, and the safe running of the automobile is ensured.

In a thermal management system of an automobile, a heat-dissipating circulating water pump is generally used as a device for providing power to a heat transfer medium, and according to the current state of the automobile, the flow rate of the heat transfer medium is controlled by controlling the flow rate of the water pump, so that heat is taken away to keep the temperature stable.

At present, a mode of MCU+pre-drive chip+MOSFET is adopted to drive a motor of a heat dissipation circulating water pump in an automobile thermal management system. As shown in fig. 1, at least 6 MOSFETs are required for controlling the motors of each water pump, at least 12 MOSFETs are required for controlling the motors of two water pumps, and the number of PWM data channels required to be provided by the MCU and the pre-driving chip corresponds to that of the MOSFETs.

Because the quantity of the heat dissipation circulating water pumps in the automobile heat management system is numerous, the quantity of the MOSFETs used by the driving control units of the heat dissipation circulating water pumps is very large, and the heat generated by the MOSFETs in the switching and conducting processes can make the temperature of the driving control units high, so that the service life of the driving control units and the heat treatment performance of the automobile heat management system are greatly influenced.

Only the heat dissipation unit is used for dissipating heat of the driving control unit, so that the temperature of the driving control unit cannot be controlled within a range meeting the requirement, and how to fundamentally reduce the heat accumulation of the driving control unit is always a problem to be solved in the field.

Disclosure of Invention

The utility model aims to provide a low-power consumption control circuit for a heat dissipation circulating water pump, which aims at overcoming the defects corresponding to the prior art, reduces the quantity of MOSFET (metal oxide semiconductor field effect transistors) needed by controlling a pair of water pumps, reduces the heat generation of the whole driving control unit of the heat dissipation circulating water pump, fundamentally solves the temperature control problem of the driving control unit, can control the temperature of the driving control unit within a range meeting the requirements, ensures the service life of the driving control unit, and enables an automobile thermal management system to exert the due heat treatment performance.

The utility model is realized by adopting the following scheme: the low-power consumption control circuit for the heat dissipation circulating water pump comprises an MCU, a pre-driving chip and a direct-current power supply, wherein the direct-current power supply is electrically connected with the MCU and the pre-driving chip, the MCU is electrically connected with nine field effect transistors through the pre-driving chip and is used for controlling a first motor and a second motor which are respectively corresponding to the two heat dissipation circulating water pumps, and each field effect transistor is an NMOS (N-channel metal oxide semiconductor) transistor;

The nine field effect transistors are respectively a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a fifth field effect transistor, a sixth field effect transistor, a seventh field effect transistor, an eighth field effect transistor and a ninth field effect transistor, and the grid electrodes of the field effect transistors are electrically connected with the pre-driving chip;

The drains of the first field effect tube, the second field effect tube and the third field effect tube are connected with the positive electrode of the direct current power supply, and the sources of the seventh field effect tube, the eighth field effect tube and the ninth field effect tube are connected with the negative electrode of the direct current power supply;

The source electrode of the first field effect tube and the drain electrode of the fourth field effect tube are both used for connecting the current input end A1 of the first motor, the source electrode of the second field effect tube and the drain electrode of the fifth field effect tube are both used for connecting the current input end B1 of the first motor, and the source electrode of the third field effect tube and the drain electrode of the sixth field effect tube are both used for connecting the current input end C1 of the first motor;

The source electrode of the fourth field effect tube and the drain electrode of the seventh field effect tube are both used for being connected with the current input end A2 of the second motor, the source electrode of the fifth field effect tube and the drain electrode of the eighth field effect tube are both used for being connected with the current input end B2 of the second motor, and the source electrode of the sixth field effect tube and the drain electrode of the ninth field effect tube are both used for being connected with the current input end C2 of the second motor.

Preferably, the MCU and the pre-driving chip each include nine pwm signal output ends, and the pre-driving chip further includes nine pwm signal input ends corresponding to the pwm signal output ends one by one.

The utility model has the advantages that:

① Compared with the prior art, the technical scheme adopted by the utility model reduces the number of MOSFETs required for controlling a pair of water pumps, reduces the heat generation of the whole driving control unit of the heat dissipation circulating water pump, fundamentally solves the temperature control problem of the driving control unit, can control the temperature of the driving control unit within a range meeting the requirements, ensures the service life of the driving control unit, and enables the automobile thermal management system to exert the due heat treatment performance;

② Compared with the prior art, the technical scheme adopted by the utility model reduces the number of MOSFETs required for controlling the water pump, so that the requirements of PWM signal input and output ends on the MCU and the pre-driving chip are correspondingly reduced, and the manufacturing cost of the whole driving control unit of the heat dissipation circulating water pump is reduced.

Drawings

FIG. 1 is a schematic diagram of the connection between a drive control unit and a motor of a heat dissipation circulating water pump in the prior art;

FIG. 2 is a schematic diagram showing connection between a driving control unit of a heat dissipation circulating water pump and a motor;

FIG. 3 is a schematic diagram of the MCU controlling two motors simultaneously in the embodiment of the utility model;

FIG. 4 is a schematic diagram of the MCU controlling only the first motor in the embodiment of the utility model;

fig. 5 is a schematic diagram of the MCU controlling only the second motor according to the embodiment of the present utility model.

Noun interpretation:

MOSFET: MOSFET metal-oxide semiconductor field effect transistors, referred to as metal-oxide-Semiconductor Field-Effect Transistor (MOSFETs), MOS, is an abbreviation for MOSFETs, and is classified into PMOS (P-channel type) and NMOS (N-channel type) transistors.

BLDC: a brushless dc motor (Brushless Direct Current Motor).

MCU: a micro control unit (Microcontroller Unit, MCU), also known as a single chip Microcomputer (SINGLE CHIP Microcomputer) or a single chip Microcomputer.

Pre-driving chip: i.e. the motor driving chip, by means of which a complete motion control system can be formed with the main processor MCU and the motor.

PWM: pulse width modulation.

Detailed Description

As shown in fig. 2, the low-power consumption control circuit for the heat dissipation circulating water pump comprises an MCU, a pre-driving chip and a direct-current power supply, wherein the direct-current power supply is electrically connected with the MCU and the pre-driving chip, the MCU is electrically connected with nine field effect transistors through the pre-driving chip and is used for controlling a first motor and a second motor which are respectively corresponding to the two heat dissipation circulating water pumps, namely the first heat dissipation circulating water pump is driven to operate by the first motor, the second heat dissipation circulating water pump is driven to operate by the second motor, and each field effect transistor is an NMOS (N-channel metal oxide semiconductor) tube;

the MCU and the pre-driving chip comprise nine pulse width modulation signal output ends, and the pre-driving chip further comprises nine pulse width modulation signal input ends which are in one-to-one correspondence with the pulse width modulation signal output ends.

The nine field effect transistors are respectively a first field effect transistor Q1, a second field effect transistor Q2, a third field effect transistor Q3, a fourth field effect transistor Q4, a fifth field effect transistor Q5, a sixth field effect transistor Q6, a seventh field effect transistor Q7, an eighth field effect transistor Q8 and a ninth field effect transistor Q9, and the grid electrodes of the field effect transistors are electrically connected with the pre-driving chip;

The drains of the first field effect tube Q1, the second field effect tube Q2 and the third field effect tube Q3 are connected with the positive electrode of the direct current power supply, and the sources of the seventh field effect tube Q7, the eighth field effect tube Q8 and the ninth field effect tube Q9 are connected with the negative electrode of the direct current power supply;

The source electrode of the first field effect tube Q1 and the drain electrode of the fourth field effect tube Q4 are both used for connecting the current input end A1 of the first motor, the source electrode of the second field effect tube Q2 and the drain electrode of the fifth field effect tube Q5 are both used for connecting the current input end B1 of the first motor, and the source electrode of the third field effect tube Q3 and the drain electrode of the sixth field effect tube Q6 are both used for connecting the current input end C1 of the first motor;

The source electrode of the fourth field effect transistor Q4 and the drain electrode of the seventh field effect transistor Q7 are both used for being connected with the current input end A2 of the second motor, the source electrode of the fifth field effect transistor Q5 and the drain electrode of the eighth field effect transistor Q8 are both used for being connected with the current input end B2 of the second motor, and the source electrode of the sixth field effect transistor Q6 and the drain electrode of the ninth field effect transistor Q9 are both used for being connected with the current input end C2 of the second motor.

The different conditions of controlling the motors of the two heat dissipation circulating water pumps by adopting the low-power consumption control circuit are as follows:

① MCU control first motor, second motor simultaneous operation:

As shown in fig. 3, the signals of PWM1, PWM5 and PWM9 sent by the MCU and the pre-driving chip through the PWM signal output end are all at high level, and the first fet Q1, the fifth fet Q5 and the ninth fet Q9 are turned on;

MCU, the pre-drive chip are low level through PWM2, PWM3, PWM4, PWM6, PWM7, PWM8 signal that pulse width modulation signal output end sent, and second field effect transistor Q2, third field effect transistor Q3, fourth field effect transistor Q4, sixth field effect transistor Q6, seventh field effect transistor Q7, eighth field effect transistor Q8 cut off, and the current flow is as follows:

DC+ & gt, a first field effect transistor Q1, a current input end A1 of a first motor, a current input end B1 of the first motor, a fifth field effect transistor Q5, a current input end B2 of a second motor, a current input end C2 of the second motor, a ninth field effect transistor Q9 and DC-.

The remaining five field effect transistors in example 1 are on, and the current flows are as follows:

1-1) the MCU and the pre-driving chip are high-level through PWM1, PWM6 and PWM8 signals sent by the pulse width modulation signal output end, and the first field effect transistor Q1, the sixth field effect transistor Q6 and the eighth field effect transistor Q8 are conducted;

MCU, the pre-drive chip are low level through PWM2, PWM3, PWM4, PWM5, PWM7, PWM9 signal that pulse width modulation signal output end sent, and second field effect transistor Q2, third field effect transistor Q3, fourth field effect transistor Q4, fifth field effect transistor Q5, seventh field effect transistor Q7, ninth field effect transistor Q9 cut off, and the current flow is as follows:

DC+ & gt, a first field effect transistor Q1, a current input end A1 of a first motor, a current input end C1 of the first motor, a sixth field effect transistor Q6, a current input end C2 of a second motor, a current input end B2 of the second motor, an eighth field effect transistor Q8 and DC-;

1-2) the MCU and the pre-driving chip are high-level through PWM2, PWM4 and PWM9 signals sent by the pulse width modulation signal output end, and the second field effect transistor Q2, the fourth field effect transistor Q4 and the ninth field effect transistor Q9 are conducted;

MCU, the pre-drive chip are low level through PWM1, PWM3, PWM5, PWM6, PWM7, PWM8 signal that pulse width modulation signal output end sent, and first field effect transistor Q1, third field effect transistor Q3, fifth field effect transistor Q5, sixth field effect transistor Q6, seventh field effect transistor Q7, eighth field effect transistor Q8 cut off, and the current flow is as follows:

DC+ & gt, a second field effect transistor Q2, a current input end B1 of a first motor, a current input end A1 of the first motor, a fourth field effect transistor Q4, a current input end A2 of the second motor, a current input end C2 of the second motor, a ninth field effect transistor Q9 and DC-;

1-3) the MCU and the pre-driving chip are high-level through PWM2, PWM6 and PWM7 signals sent by the pulse width modulation signal output end, and the second field effect transistor Q2, the sixth field effect transistor Q6 and the seventh field effect transistor Q7 are conducted;

MCU, the pre-drive chip are low level through PWM1, PWM3, PWM4, PWM5, PWM8, PWM9 signal that pulse width modulation signal output end sent, and first field effect transistor Q1, third field effect transistor Q3, fourth field effect transistor Q4, fifth field effect transistor Q5, eighth field effect transistor Q8, ninth field effect transistor Q9 cut off, and the current flow is as follows:

DC+ & gt, a second field effect transistor Q2, a current input end B1 of a first motor, a current input end C1 of the first motor, a sixth field effect transistor Q6, a current input end C2 of the second motor, a current input end A2 of the second motor, a seventh field effect transistor Q7 and DC-;

1-4) the MCU and the pre-driving chip are high-level through PWM3, PWM4 and PWM8 signals sent by the pulse width modulation signal output end, and the third field effect transistor Q3, the fourth field effect transistor Q4 and the eighth field effect transistor Q8 are conducted;

MCU, the pre-drive chip are low level through PWM1, PWM2, PWM5, PWM6, PWM7, PWM9 signal that pulse width modulation signal output end sent, and first field effect transistor Q1, second field effect transistor Q2, fifth field effect transistor Q5, sixth field effect transistor Q6, seventh field effect transistor Q7, ninth field effect transistor Q9 cut off, and the current flow is as follows:

DC+ & gt, a third field effect transistor Q3, a current input end C1 of the first motor, a current input end A1 of the first motor, a fourth field effect transistor Q4, a current input end A2 of the second motor, a current input end B2 of the second motor, an eighth field effect transistor Q8 and DC-;

1-5) the MCU and the pre-driving chip are high-level through PWM3, PWM5 and PWM7 signals sent by the pulse width modulation signal output end, and the third field effect transistor Q3, the fifth field effect transistor Q5 and the seventh field effect transistor Q7 are conducted;

MCU, the pre-drive chip are low level through PWM1, PWM2, PWM4, PWM6, PWM8, PWM9 signal that pulse width modulation signal output end sent, and first field effect transistor Q1, second field effect transistor Q2, fourth field effect transistor Q4, sixth field effect transistor Q6, eighth field effect transistor Q8, ninth field effect transistor Q9 cut off, and the current flow is as follows:

DC+ & gt, a third field effect transistor Q3, a current input end C1 of the first motor, a current input end B1 of the first motor, a fifth field effect transistor Q5, a current input end B2 of the second motor, a current input end A2 of the second motor, a seventh field effect transistor Q7 and DC-.

② The MCU only controls the first motor to run:

As shown in fig. 4, the signals of PWM1, PWM5 and PWM8 sent by the MCU and the pre-driving chip through the PWM signal output end are all at high level, and the first fet Q1, the fifth fet Q5 and the eighth fet Q8 are turned on;

MCU, the pre-drive chip are low level through PWM2, PWM3, PWM4, PWM6, PWM7, PWM9 signal that pulse width modulation signal output end sent, and second field effect transistor Q2, third field effect transistor Q3, fourth field effect transistor Q4, sixth field effect transistor Q6, seventh field effect transistor Q7, ninth field effect transistor Q9 cut off, and the current flow is as follows:

DC+ & gt, a first field effect transistor Q1, a current input end A1 of a first motor, a current input end B1 of the first motor, a fifth field effect transistor Q5, an eighth field effect transistor Q8 and DC-.

The remaining five field effect transistors in example 2 are on, and the current flows are as follows:

2-1) the MCU and the pre-driving chip are high-level through PWM1, PWM6 and PWM9 signals sent by the pulse width modulation signal output end, and the first field effect transistor Q1, the sixth field effect transistor Q6 and the ninth field effect transistor Q9 are conducted;

MCU, the pre-drive chip are low level through PWM2, PWM3, PWM4, PWM5, PWM7, PWM8 signal that pulse width modulation signal output end sent, and second field effect transistor Q2, third field effect transistor Q3, fourth field effect transistor Q4, fifth field effect transistor Q5, seventh field effect transistor Q7, eighth field effect transistor Q8 cut off, and the current flow is as follows:

DC+ & gt, a first field effect transistor Q1, a current input end A1 of a first motor, a current input end C1 of the first motor, a sixth field effect transistor Q6, a ninth field effect transistor Q9 and DC-;

2-2) the MCU and the pre-driving chip are high-level through PWM2, PWM4 and PWM7 signals sent by the pulse width modulation signal output end, and the second field effect transistor Q2, the fourth field effect transistor Q4 and the seventh field effect transistor Q7 are conducted;

MCU, the pre-drive chip are low level through PWM1, PWM3, PWM5, PWM6, PWM8, PWM9 signal that pulse width modulation signal output end sent, and first field effect transistor Q1, third field effect transistor Q3, fifth field effect transistor Q5, sixth field effect transistor Q6, eighth field effect transistor Q8, ninth field effect transistor Q9 cut off, and the current flow is as follows:

DC+ & gt, a second field effect transistor Q2, a current input end B1 of the first motor, a current input end A1 of the first motor, a fourth field effect transistor Q4, a seventh field effect transistor Q7 and DC-;

2-3) the MCU and the pre-driving chip are high-level through PWM2, PWM6 and PWM9 signals sent by the pulse width modulation signal output end, and the second field effect transistor Q2, the sixth field effect transistor Q6 and the ninth field effect transistor Q9 are conducted;

MCU, the pre-drive chip are low level through PWM1, PWM3, PWM4, PWM5, PWM7, PWM8 signal that pulse width modulation signal output end sent, and first field effect transistor Q1, third field effect transistor Q3, fourth field effect transistor Q4, fifth field effect transistor Q5, eighth field effect transistor Q8, ninth field effect transistor Q9 cut off, and the current flow is as follows:

DC+ & gt, a second field effect transistor Q2, a current input end B1 of the first motor, a current input end C1 of the first motor, a sixth field effect transistor Q6, a ninth field effect transistor Q9 and DC-;

2-4) the MCU and the pre-driving chip are high-level through PWM3, PWM4 and PWM7 signals sent by the pulse width modulation signal output end, and the third field effect transistor Q3, the fourth field effect transistor Q4 and the seventh field effect transistor Q7 are conducted;

MCU, the pre-drive chip are low level through PWM1, PWM2, PWM5, PWM6, PWM8, PWM9 signal that pulse width modulation signal output end sent, and first field effect transistor Q1, second field effect transistor Q2, fifth field effect transistor Q5, sixth field effect transistor Q6, eighth field effect transistor Q8, ninth field effect transistor Q9 cut off, and the current flow is as follows:

DC+ & gt, a third field effect transistor Q3, a current input end C1 of the first motor, a current input end A1 of the first motor, a fourth field effect transistor Q4, a seventh field effect transistor Q7 and DC-;

2-5) the MCU and the pre-driving chip are high-level through PWM3, PWM5 and PWM8 signals sent by the pulse width modulation signal output end, and the third field effect transistor Q3, the fifth field effect transistor Q5 and the eighth field effect transistor Q8 are conducted;

MCU, the pre-drive chip are low level through PWM1, PWM2, PWM4, PWM6, PWM7, PWM9 signal that pulse width modulation signal output end sent, and first field effect transistor Q1, second field effect transistor Q2, fourth field effect transistor Q4, sixth field effect transistor Q6, seventh field effect transistor Q7, ninth field effect transistor Q9 cut off, and the current flow is as follows:

DC+ & gt, a third field effect transistor Q3, a current input end C1 of the first motor, a current input end B1 of the first motor, a fifth field effect transistor Q5, an eighth field effect transistor Q8 and DC-.

③ The MCU only controls the second motor to run:

As shown in fig. 5, the signals of PWM2, PWM5 and PWM9 sent by the MCU and the pre-driving chip through the PWM signal output end are all at high level, and the second fet Q2, the fifth fet Q5 and the ninth fet Q9 are turned on;

MCU, the pre-drive chip are low level through PWM1, PWM3, PWM4, PWM6, PWM7, PWM8 signal that pulse width modulation signal output end sent, and first field effect transistor Q1, third field effect transistor Q3, fourth field effect transistor Q4, sixth field effect transistor Q6, seventh field effect transistor Q7, eighth field effect transistor Q8 cut off, and the current flow is as follows:

DC+ & gt, a second field effect tube Q2, a fifth field effect tube Q5, an A2 phase of a second water pump, a C2 phase of the second water pump, a ninth field effect tube Q9 and DC-.

The remaining five currents and conduction conditions are as follows:

3-1) the MCU and the pre-driving chip are high-level through PWM1, PWM4 and PWM8 signals sent by the pulse width modulation signal output end, and the first field effect transistor Q1, the fourth field effect transistor Q4 and the eighth field effect transistor Q8 are conducted;

MCU, the pre-drive chip are low level through PWM2, PWM3, PWM5, PWM6, PWM7, PWM9 signal that pulse width modulation signal output end sent, and second field effect transistor Q2, third field effect transistor Q3, fifth field effect transistor Q5, sixth field effect transistor Q6, seventh field effect transistor Q7, ninth field effect transistor Q9 cut off, and the current flow is as follows:

DC+ & gt, a first field effect transistor Q1, a fourth field effect transistor Q4, a current input end A2 of a second motor, a current input end B2 of the second motor, an eighth field effect transistor Q8 and DC-;

3-2) the MCU and the pre-driving chip are high-level through PWM1, PWM4 and PWM9 signals sent by the pulse width modulation signal output end, and the first field effect transistor Q1, the fourth field effect transistor Q4 and the ninth field effect transistor Q9 are conducted;

MCU, the pre-drive chip are low level through PWM2, PWM3, PWM5, PWM6, PWM7, PWM8 signals that pulse width modulation signal output end sent, second field effect tube Q2, third field effect tube Q3, fifth field effect tube Q5, sixth field effect tube Q6, seventh field effect tube Q7, eighth field effect tube Q8 cut off, the current flow is as follows:

DC+ & gt, a first field effect transistor Q1, a fourth field effect transistor Q4, a current input end A2 of a second motor, a current input end C2 of the second motor, a ninth field effect transistor Q9 and DC-;

3-3) the MCU and the pre-driving chip are high-level through PWM2, PWM5 and PWM7 signals sent by the pulse width modulation signal output end, and the second field effect transistor Q2, the fifth field effect transistor Q5 and the seventh field effect transistor Q7 are conducted;

MCU, the pre-drive chip are low level through PWM1, PWM3, PWM4, PWM6, PWM8, PWM9 signal that pulse width modulation signal output end sent, and first field effect transistor Q1, third field effect transistor Q3, fourth field effect transistor Q4, sixth field effect transistor Q6, eighth field effect transistor Q8, ninth field effect transistor Q9 cut off, and the current flow is as follows:

DC+ & gt, a second field effect transistor Q2, a fifth field effect transistor Q5, a current input end B2 of a second motor, a current input end A2 of the second motor, a seventh field effect transistor Q7 and DC-;

3-4) the MCU and the pre-driving chip are high-level through PWM3, PWM6 and PWM8 signals sent by the pulse width modulation signal output end, and the third field effect transistor Q3, the sixth field effect transistor Q6 and the eighth field effect transistor Q8 are conducted;

MCU, the pre-drive chip are low level through PWM1, PWM2, PWM4, PWM5, PWM7, PWM9 signal that pulse width modulation signal output end sent, and first field effect transistor Q1, second field effect transistor Q2, fourth field effect transistor Q4, fifth field effect transistor Q5, seventh field effect transistor Q7, ninth field effect transistor Q9 cut off, and the current flow is as follows:

DC+ & gt, a third field effect transistor Q3, a sixth field effect transistor Q6, a current input end C2 of the second motor, a current input end B2 of the second motor, an eighth field effect transistor Q8 and DC-;

3-5) the MCU and the pre-driving chip are high-level through PWM3, PWM6 and PWM7 signals sent by the pulse width modulation signal output end, and the third field effect transistor Q3, the sixth field effect transistor Q6 and the seventh field effect transistor Q7 are conducted;

MCU, the pre-drive chip are low level through PWM1, PWM2, PWM4, PWM5, PWM8, PWM9 signal that pulse width modulation signal output end sent, and first field effect transistor Q1, second field effect transistor Q2, fourth field effect transistor Q4, fifth field effect transistor Q5, eighth field effect transistor Q8, ninth field effect transistor Q9 cut off, and the current flow is as follows:

DC+ & gt, a third field effect transistor Q3, a sixth field effect transistor Q6, a current input end C2 of the second motor, a current input end A2 of the second motor, a seventh field effect transistor Q7 and DC-.

In this embodiment, the motors of the heat dissipation and circulation pumps are BLDC, the field effect transistors are IAUA N04S5N010 manufactured by Infineon (inflorescence), the MCU is SAK-TC277TP-64F200N DC manufactured by Infineon (inflorescence), and the pre-driving chip is a pre-driving chip set formed by two L9908 manufactured by ST (meaning).

If the field effect transistors in the utility model all adopt PMOS tubes, the positive and negative poles of the direct current power supply in the embodiment are only required to be mutually changed in position, so that the drains of the first field effect transistor, the second field effect transistor and the third field effect transistor are connected with the negative pole of the direct current power supply, the sources of the seventh field effect transistor, the eighth field effect transistor and the ninth field effect transistor are connected with the positive pole of the direct current power supply, and the current output by the direct current power supply is input by the sources of all PMOS tubes and output by the drains.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the utility model, and those skilled in the art will appreciate that the modifications made to the utility model fall within the scope of the utility model without departing from the spirit of the utility model.

Claims (2)

1. The low-power consumption control circuit for the heat dissipation circulating water pump comprises an MCU, a pre-driving chip and a direct-current power supply, wherein the direct-current power supply is electrically connected with the MCU and the pre-driving chip;

The nine field effect transistors are respectively a first field effect transistor, a second field effect transistor, a third field effect transistor, a fourth field effect transistor, a fifth field effect transistor, a sixth field effect transistor, a seventh field effect transistor, an eighth field effect transistor and a ninth field effect transistor, and the grid electrodes of the field effect transistors are electrically connected with the pre-driving chip;

The drains of the first field effect tube, the second field effect tube and the third field effect tube are connected with the positive electrode of the direct current power supply, and the sources of the seventh field effect tube, the eighth field effect tube and the ninth field effect tube are connected with the negative electrode of the direct current power supply;

The source electrode of the first field effect tube and the drain electrode of the fourth field effect tube are both used for connecting the current input end A1 of the first motor, the source electrode of the second field effect tube and the drain electrode of the fifth field effect tube are both used for connecting the current input end B1 of the first motor, and the source electrode of the third field effect tube and the drain electrode of the sixth field effect tube are both used for connecting the current input end C1 of the first motor;

The source electrode of the fourth field effect tube and the drain electrode of the seventh field effect tube are both used for being connected with the current input end A2 of the second motor, the source electrode of the fifth field effect tube and the drain electrode of the eighth field effect tube are both used for being connected with the current input end B2 of the second motor, and the source electrode of the sixth field effect tube and the drain electrode of the ninth field effect tube are both used for being connected with the current input end C2 of the second motor.

2. The low power consumption control circuit of claim 1, wherein the MCU and the pre-driver chip each comprise nine pwm signal output terminals, and the pre-driver chip further comprises nine pwm signal input terminals in one-to-one correspondence with the pwm signal output terminals.