A DC motor speed control circuit and electronic equipment with the circuit

A DC motor, speed control technology, applied in the direction of excitation or armature current control, can solve the problems of DC motor damage, DC motor stall, DC motor rise, etc., to avoid the effect of excessive internal current
CN104883101BActive Publication Date: 2018-10-19QINGDAO GOERTEK
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Patents(China)
Current Assignee / Owner
QINGDAO GOERTEK
Publication Date
2018-10-19

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Abstract

The invention discloses a DC motor rotating speed control circuit and an electronic device equipped with same. The DC motor rotating speed control circuit comprises a start unit, a speed regulation control unit, a mirror image control unit, and a filtering freewheeling unit. The start unit receives an enable signal transmitted from a system controller, and starts an internal circuit of the start unit and the speed regulation control unit. The speed regulation control unit receives a speed regulation control signal transmitted from the system controller, adjusts the internal circuit structure of the speed regulation control unit, and performs speed regulation control. The mirror image control unit controls and adjusts the current of a DC motor according to the speed regulation control of the speed regulation control unit. The filtering freewheeling unit is used for filtering an interference signal of the adjusted current of the DC motor and back flowing complementary energy. The DC motor rotating speed control circuit adjusts the current of the DC motor by means of the speed regulation control unit and the mirror image control unit so as to prevent a loss caused by overlarge internal current of the DC motor.
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Description

technical field

[0001] The invention relates to the technical field of power electronics, in particular to a DC motor speed control circuit and electronic equipment with the circuit. Background technique

[0002] At present, DC motors are used in various fields of industry due to their superior speed regulation performance. DC motors can be divided into shunt-excited DC motors, series-excited DC motors and compound-excited DC motors according to their different excitation methods. However, in industry, the speed of a DC motor depends on the voltage applied across it. Usually, the DC motor speed uses a voltage regulating coil to change the voltage at both ends of the DC motor coil to adjust the speed, or a single-chip microcomputer is used to automatically control the speed of the DC motor.

[0003] Therefore, in the process of designing the DC motor control circuit, the inventor found at least the following problems in the prior art:

[0004] Faults such as stalling in th...

Claims

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