CN213959973U

CN213959973U - H-bridge motor driving circuit

Info

Publication number: CN213959973U
Application number: CN202022575962.3U
Authority: CN
Inventors: 朱祥桢
Original assignee: Suzhou Changmei Intelligent Technology Co ltd
Current assignee: Suzhou Changmei Intelligent Technology Co ltd
Priority date: 2020-11-10
Filing date: 2020-11-10
Publication date: 2021-08-13
Anticipated expiration: 2030-11-10

Abstract

The utility model relates to a H bridge motor drive circuit, including motor and controller, the controller is provided with first output terminal and second output terminal, first output terminal switches on with the G utmost point of first NMOS pipe, the S utmost point ground connection of first NMOS pipe, the D utmost point is connected with the first link of motor after parallelly connected with the D utmost point of first PMOS pipe, the S utmost point of first PMOS pipe connects the power positive pole, the power is through the second link of first, second divider resistance connection motor, the G utmost point of first PMOS pipe is connected to between first, the second divider resistance; the second output terminal is conducted with the G pole of the second NMOS tube, the S pole of the second NMOS tube is grounded, the D pole of the second PMOS tube is connected with the second connecting end in parallel and then conducted, the S pole of the second PMOS tube is connected with the positive pole of the power supply, the power supply is connected with the first connecting end through the third voltage-dividing resistor and the fourth voltage-dividing resistor, and the G pole of the second PMOS tube is connected between the third voltage-dividing resistor and the fourth voltage-dividing resistor.

Description

H-bridge motor driving circuit

Technical Field

The utility model belongs to the technical field of motor control, concretely relates to H bridge motor drive circuit.

Background

The H-bridge motor driving circuit is a commonly used direct current motor control circuit, an H bridge is formed by four MOS tubes, the control of the rotating speed and the steering of a motor is realized by controlling the on-off of each MOS tube through a controller, but the structure of the traditional H-bridge motor driving circuit is still more complex, the four MOS tubes are independently controlled, the high matching effect among the MOS tubes can be realized only when the signal output of the controller has extremely high time precision, and the precision of the motor can be ensured. Therefore, the conventional H-bridge motor driving circuit has very high requirements on the quality of the controller and the quality of programming, which results in high cost.

SUMMERY OF THE UTILITY MODEL

The utility model discloses the technical problem that will solve is: the H-bridge motor driving circuit is simple in structure and high in control precision, and can control the forward and reverse rotation of the motor only by switching two control signals.

In order to solve the technical problem, the utility model discloses a technical scheme is: a kind of H bridge motor drive circuit, including motor and controller, the said controller has first output terminal and second output terminal, the first output terminal is conducted with G pole of the first NMOS tube, S pole of the first NMOS tube is grounded, D pole and D pole of the first PMOS tube are connected in parallel and then conducted with the first connecting end of the motor, S pole of the first PMOS tube connects the positive pole of the power, the power still connects the second connecting end of the motor through first divider resistance and second divider resistance, G pole of the first PMOS tube connects to between first divider resistance and second divider resistance; the second output terminal is conducted with a G pole of a second NMOS tube, an S pole of the second NMOS tube is grounded, the D pole of the second PMOS tube is connected in parallel and then conducted with a second connecting end of the motor, the S pole of the second PMOS tube is connected with the positive electrode of the power supply, the power supply is further connected with the first connecting end of the motor through a third voltage dividing resistor and a fourth voltage dividing resistor, the G pole of the second PMOS tube is connected between the third voltage dividing resistor and the fourth voltage dividing resistor, the first voltage dividing resistor and the second voltage dividing resistor enable the G pole of the first PMOS tube to obtain voltage enabling the first PMOS tube to be conducted, and the third voltage dividing resistor and the fourth voltage dividing resistor enable the G pole of the second PMOS tube to obtain voltage enabling the second PMOS tube to be conducted.

The utility model has the advantages that: the utility model discloses a divider resistance of two high resistance values of establishing ties between the anodal first link of power and motor, and connect the G utmost point of second PMOS pipe between two divider resistance, thereby make the G utmost point of second PMOS pipe when the first link of motor is the low level, form the high level that switches on the second PMOS pipe, make the second PMOS pipe switch on, the G utmost point that makes first PMOS pipe in the same way is when the motor second link is the low level, form the high level that switches on first PMOS pipe, make first PMOS pipe switch on, thereby, only need export the high level to the G utmost point of first NMOS pipe, make the first link of motor form the low level, just can directly switch on the second PMOS pipe, make the motor both ends form the return circuit, make the motor rotatory, otherwise, only need export the high level to the G utmost point of second NMOS pipe, just enable the motor reverse rotation. As only the signal is output to the G pole of the first NMOS tube or the second NMOS tube, the two ends of the motor can form a loop to rotate the motor, thereby reducing the requirement on the signal output time precision of the controller, improving the rotation precision of the motor and reducing the production cost of the motor driving circuit.

Drawings

The following detailed description of embodiments of the present invention is provided with reference to the accompanying drawings, in which:

fig. 1 is a circuit diagram of the present invention.

Detailed Description

The following describes in detail a specific embodiment of the present invention with reference to the drawings.

As shown in fig. 1, an H-bridge motor driving circuit includes a motor M and a controller MCU, the controller MCU is provided with a first output terminal N1 and a second output terminal N2, the first output terminal N1 is connected to a G electrode of a first NMOS transistor Q1, an S electrode of the first NMOS transistor Q1 is grounded, a D electrode of a first NMOS transistor Q1 is connected in parallel with a D electrode of a first PMOS transistor Q3 and then connected to a first connection end a of the motor M, an S electrode of the first PMOS transistor Q3 is connected to a positive electrode of a power supply, the power supply is further connected to a second connection end B of the motor M through a first voltage dividing resistor R1 and a second voltage dividing resistor R2, and the G electrode of the first PMOS transistor Q3 is connected between a first voltage dividing resistor R1 and a second voltage dividing resistor R2; the second output terminal N2 is conducted with the G electrode of the second NMOS transistor Q2, the S electrode of the second NMOS transistor Q2 is grounded, the D electrode of the second NMOS transistor Q2 is connected in parallel with the D electrode of the second PMOS transistor Q4 and then is connected and conducted with the second connection terminal B of the motor M, the S electrode of the second PMOS transistor Q4 is connected with the positive electrode of the power supply, the power supply is further connected with the first connection terminal a of the motor M through a third voltage dividing resistor R3 and a fourth voltage dividing resistor R4, the G electrode of the second PMOS transistor Q4 is connected between the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4, the G electrode of the first PMOS transistor Q3 is made to obtain a voltage for conducting the first PMOS transistor Q3 by the first voltage dividing resistor R1 and the second voltage dividing resistor R2, and the G electrode of the second PMOS transistor Q4 is made to obtain a voltage for conducting the second PMOS transistor Q4 by the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4.

The utility model discloses the theory of operation is: when the controller MCU outputs a high level through the first output terminal N1, the second NMOS transistor Q2 is turned on, so that the second connection terminal B of the motor M is grounded, and after voltage is divided by the first voltage dividing resistor R1 and the second voltage dividing resistor R2, the G pole of the first PMOS transistor Q3 obtains a voltage to turn on the first PMOS transistor, and finally, the positive power supply, the first PMOS transistor Q3, the motor M, the second NMOS transistor Q2, and the ground terminal (equivalent to the negative pole) form a loop, and the motor rotates. At this time, the voltages at the two ends of the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4 are consistent with the power supply voltage, the voltage at the G-pole of the second PMOS transistor Q4 is too high, and the second PMOS transistor Q4 cannot be turned on.

On the contrary, when the controller MCU outputs a high level through the second output terminal N2, the first NMOS transistor Q1 is turned on, so that the first connection terminal a of the motor M is grounded, and after voltage is divided by the third voltage dividing resistor R3 and the fourth voltage dividing resistor R4, the G pole of the second PMOS transistor Q4 obtains a voltage to turn on the second PMOS transistor Q4, and finally, the positive power supply, the second PMOS transistor Q4, the motor M, the first NMOS transistor Q1, and the ground terminal (equivalent to the negative pole) form a loop, and the motor rotates in the reverse direction. At this time, the voltage across the first voltage-dividing resistor R1 and the second voltage-dividing resistor R2 is equal to the power supply voltage, the voltage at the G-pole of the first PMOS transistor Q3 is too high, and the first PMOS transistor Q3 cannot be turned on.

It can be seen that H bridge motor drive circuit, only need export a high level, just can make motor M both ends form the return circuit, make motor M rotate to reduced the requirement to controller MCU time precision, improved the motor and rotated the precision. And meanwhile, the production cost of the motor driving circuit is reduced.

The above embodiments are merely illustrative of the principles and effects of the present invention, and some embodiments in use, and are not intended to limit the invention; it should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the inventive concept of the present invention, and these changes and modifications belong to the protection scope of the present invention.

Claims

1. A H-bridge motor driving circuit comprises a motor and a controller, and is characterized in that the controller is provided with a first output terminal and a second output terminal, the first output terminal is conducted with a G electrode of a first NMOS (N-channel metal oxide semiconductor) tube, an S electrode of the first NMOS tube is grounded, a D electrode is connected in parallel with a D electrode of a first PMOS tube and then is connected and conducted with a first connecting end of the motor, the S electrode of the first PMOS tube is connected with a positive electrode of a power supply, the power supply is also connected with a second connecting end of the motor through a first divider resistor and a second divider resistor, and the G electrode of the first PMOS tube is connected between the first divider resistor and the second divider resistor; the second output terminal is conducted with a G pole of a second NMOS tube, an S pole of the second NMOS tube is grounded, the D pole of the second PMOS tube is connected in parallel and then conducted with a second connecting end of the motor, the S pole of the second PMOS tube is connected with the positive electrode of the power supply, the power supply is further connected with the first connecting end of the motor through a third voltage dividing resistor and a fourth voltage dividing resistor, the G pole of the second PMOS tube is connected between the third voltage dividing resistor and the fourth voltage dividing resistor, the first voltage dividing resistor and the second voltage dividing resistor enable the G pole of the first PMOS tube to obtain voltage enabling the first PMOS tube to be conducted, and the third voltage dividing resistor and the fourth voltage dividing resistor enable the G pole of the second PMOS tube to obtain voltage enabling the second PMOS tube to be conducted.