DC motor driving circuit

Abstract

The invention provides a DC motor driving circuit. The DC motor driving circuit comprises an H bridge circuit of which an output end is connected with a first motor and a second motor, the H bridge circuit is used for controlling the first motor and the second motor for positive rotation, negative rotation and braking; an NAND logic circuit used for controlling conduction or closing of an H bridge of the H bridge circuit, an optical coupler isolation circuit used for isolating a single-chip microcomputer control circuit from the H bridge circuit to guarantee stability of the single-chip microcomputer control circuit; and a power source circuit used for converting a high voltage into a low voltage for supply for the optical coupler isolation circuit, the NAND logic circuit and the H bridge circuit. The DC motor driving circuit is advantaged in that a sink current driving mode is utilized, direct driving of most of single-chip microcomputers is supported, the large power tube H bridge principle is employed to control positive rotation, negative rotation and braking of the motors, moreover, rotation speeds of two DC motors can be further adjusted, photoelectric isolation is employed, stability of the single-chip microcomputer control circuit is guaranteed, a driving problem of a large power DC motor is solved, and the DC motor is enabled to realize safe, stable and high-efficiency operation in various occasions.

Description

technical field [0001] The invention relates to the technical field of motor drive, in particular to a DC motor drive circuit. Background technique [0002] With the advancement of national science and technology and the gradual realization of social electromechanical automation, more and more occasions require DC motors to drive various industrial processes, because DC motors have a wide range of speed regulation, strong overload capacity and large startup. Torque and other advantages, so it is widely used in electric locomotives, industrial and mining locomotives, urban trams, elevators, robots, etc. The large-scale use of DC motors requires powerful and stable drive circuits to support. Some current drive circuits exist Low power, incomplete functions, unstable performance and other deficiencies bring a lot of inconvenience to the normal and efficient use of DC motors and hinder the rapid development of mechatronics. Contents of the invention [0003] In view of the ab...

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Problems solved by technology

[0003] In view of the shortcomings of the prior art described above, the purpose of the present invention is to provide a DC motor drive circuit for solving the problems of low power, incomplete functions, and unstable performance of the drive circuit in the prior art.

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