Forward-reverse rotation control circuit for brush DC motor

Abstract

The invention provides a forward-reverse rotation control circuit for a brush DC motor. A coil of the brush DC motor is connected with the control circuit through a commutator and an electric brush, the control circuit comprises a comparator and a class-b amplifying circuit, and output of the comparator drives the class-b amplifying circuit to provide a complementary output end IRIS and a power ground SGND for supplying power to the motor. The comparator comprises two paths of complementary input, the output of the comparator is connected to the class-b amplifying circuit, the class-b amplifying circuit comprises two triodes, bases of the two triodes are connected with each other and then connected with the output end of the comparator, and emitters of the two triodes are connected with each other and serve as the complementary output end IRIS of the amplifying circuit. The forward-reverse rotation control circuit for the brush DC motor utilizes the combination of the complementary output characteristics of the traditional class-b amplifying circuit and the comparator, can effectively control the forward and reverse rotation of the brush DC motor, can effectively reduce the size of a controller by adopting SMD components, is conductive to the integrated development with other circuits, and can effectively prolong the service life of a forward-reverse rotation control module.

Description

technical field [0001] The invention belongs to the field of DC motor control, and in particular relates to a forward and reverse control circuit of a brushed DC motor. Background technique [0002] The DC power applied to the DC motor, with the help of the commutator and the brush, makes the direction of the current flowing in the armature coil of the DC motor alternate, so that the direction of the electromagnetic torque generated by the armature is constant. , to ensure that the DC motor rotates continuously in a determined direction. This is the basic working principle of a DC motor. In the actual brushed DC motor, many coils are evenly embedded on the circumference of the armature. Correspondingly, the commutator is composed of many commutation pieces, so that the total electromagnetic torque generated by the armature coil is large enough and relatively uniform. The speed is also relatively uniform. Through this basic principle, in order to reverse the direction of t...

AI Technical Summary

Problems solved by technology

[0003] At present, the forward and reverse control of many miniature brushed DC motors is realized by relays. The controller itself is large in size, which is not conducive to the miniaturization of the entire device; the contact opening and closing of the relay is also a test for the mechanical life.

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