Motor control circuit capable of suppressing interference signals

Abstract

The invention discloses a motor control circuit capable of suppressing interference signals, which is applied to electrical connection with a motor module comprising a signal end and a power end. The motor control circuit comprises a control module, a first transient voltage suppression element and a second transient voltage suppression element, wherein the control module comprises a signal end electrically connected with the signal end of the motor module and a power end electrically connected with the power end of the motor module; the first transient voltage suppression element is electrically connected between the signal end and a grounding end of the control module; and the second transient voltage suppression element is electrically connected between the power end and the grounding end of the control module. Thus, positive and negative high-pulse interference signals can be provided to a flowing path of the grounding end at the same time, and error judgment, abnormal operation and damaged inner element due to high voltage can be prevented from happening to the motor control circuit.

Description

technical field [0001] The invention relates to a control circuit, in particular to a motor control circuit with interference signal suppression. Background technique [0002] Since the direct current (DC) motor will generate positive and negative high-pulse interference signals due to Lenz's law when it starts running and shuts down, the voltage shock caused by the interference signal is easy to pass through the line. The motor control circuit transmitted to its electrical connection will cause the control signal in the motor control circuit to be misjudged, operate abnormally, or even cause the internal components of the motor control circuit to be damaged due to high voltage shock, which not only causes inconvenience in use, but also increases maintenance costs. [0003] In order to solve the above problems, as shown in Taiwan Invention Patent No. I353700, there is an existing motor drive circuit with instantaneous high voltage protection that is electrically connected t...

AI Technical Summary

Problems solved by technology

[0002] Since the direct current (DC) motor will generate positive and negative high-pulse interference signals due to Lenz's law when it starts running and shuts down, the voltage shock caused by the interference signal is easy to pass through the line. The motor control circuit transmitted to its electrical connection will cause the control signal in the motor control circuit to be misjudged, operate abnormally, or even cause the internal components of the motor control circuit to be damaged due to high voltage shock, which not only causes inconvenience in use, but also increases maintenance cost

[0003] In order to solve the above problems, as shown in Taiwan Invention Patent No. I353700, there is an existing motor drive circuit with instantaneous high voltage protection that is electrically connected to a pulse absorbing element at an output detection pin of the motor drive circuit to reduce high voltage. However, the existing technology only provides unidirectional voltage protection for the output detection pin, and there is still room for improvement.

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