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Current smoothing method and device

A smoothing device and current technology, which is applied in the direction of excitation or armature current control, DC motor rotation control, etc., can solve the problems of H-bridge circuit current mutation and adverse effects of DC motor operation, so as to avoid sudden changes in current and reduce adverse effects Effect

Active Publication Date: 2022-02-11
湖南英迈智能科技有限公司
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Problems solved by technology

[0004] Embodiments of the present invention provide a current smoothing method and device to solve the problem of directly changing the duty cycle of the PWM signal used in the prior art to complete the sampling of the current, which may easily lead to a sudden change in the current in the H-bridge circuit, causing the DC Problems that adversely affect the operation of the motor

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Embodiment Construction

[0023] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, the following will be described in detail with reference to the accompanying drawings and specific embodiments. In the following description, specific details, such as specific configurations and components, are provided only to assist in a comprehensive understanding of the embodiments of the present invention. Accordingly, those of ordinary skill in the art should recognize that various changes and modifications of the embodiments described herein can be made without departing from the scope and spirit of the invention. Also, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

[0024] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by those skilled in the art to which the present invention belongs. "First", "sec...

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Abstract

Embodiments of the present invention provide a current smoothing method and device, wherein the above-mentioned current smoothing method is applied to an H-bridge circuit, and the method includes: acquiring a first duty ratio of a first PWM signal; In the case of the preset duty ratio range, determine the phase-shifted PWM signal from the first PWM signal and the second PWM signal, adjust the phase of the phase-shifted PWM signal, obtain the phase-shifted PWM signal, and determine the sampling time; Adjust the duty ratio of the phase-shifted PWM signal to obtain the target PWM signal, and the target PWM signal is a unipolar PWM signal. The embodiment of the present invention helps to avoid the sudden change of the current in the H bridge circuit, and alleviate the adverse effect on the operation of the motor caused by the sudden change of the current.

Description

technical field [0001] The invention relates to the technical field of current sampling, in particular to a current smoothing method and device. Background technique [0002] As we all know, based on the H-bridge circuit, the control of the forward and reverse working process of the DC motor can be realized, and the sampling of the working current for the DC motor is an important part of the torque adjustment of the DC motor. When sampling the operating current of a DC motor, such as figure 1 The lower-end sampling circuit shown has been widely used. In the lower-end sampling circuit, the sampling resistor Current is set on the ground side (or power supply side) of the H-bridge circuit. [0003] The defect of the lower-end sampling circuit is that when the pulse width modulation (Pulse width modulation, PWM) signal driving the H-bridge circuit is a unipolar PWM signal, and the duty cycle is 50% or near, the current may not flow through the sampling resistor Or when the tim...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P7/29H02P7/03
CPCH02P7/29H02P7/04
Inventor 倪四桥姚常瓦陈奇志鲁光
Owner 湖南英迈智能科技有限公司
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