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Single-resistor current sampling method and system

A current sampling and single-resistor technology, applied in the estimation/correction of motor parameters, etc., can solve problems such as affecting the effect of single-resistor current sampling, and achieve the effect of improving the effect and ensuring the integrity.

Active Publication Date: 2016-09-21
GUANGZHOU SHIYUAN ELECTRONICS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on this, it is necessary to provide a single-resistance current sampling method and system for the technical problems that the traditional technology affects the single-resistance current sampling effect

Method used

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  • Single-resistor current sampling method and system

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Embodiment Construction

[0021] The specific implementation of the single-resistance current sampling method and system of the present invention will be described in detail below with reference to the accompanying drawings.

[0022] refer to figure 1 , figure 1 The flow chart of the single-resistance current sampling method of an embodiment is shown, including the following steps:

[0023] S10, judging whether the duty cycle control signal reaches the duty cycle limit condition according to the first difference, the second difference and the time intermediate value of the duty cycle control signal during the operation of the motor; wherein the first difference is the difference between the time median value and the time minimum value, and the second difference is the difference between the time maximum value and the time median value;

[0024] The single-resistance current sampling device corresponding to the three-phase current of the motor can be as follows: figure 2 as shown, figure 2 It is a...

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Abstract

The invention relates to a single-resistor current sampling method and system. The single-resistor current sampling method comprises the steps as follows: whether a duty ratio control signal reaches duty ratio limiting conditions or not according to a first difference value, a second difference value and a time median of the duty ratio control signal in a motor operating process, wherein the first difference value is the difference between the time median and the minimum time value; the second difference value is the difference between the maximum time value and the time median; if the duty ratio control signal reaches the duty ratio limiting conditions, the motor operating frequency of a motor is obtained and the operating angle of a rotor in the motor in the next control beat is predicted according to the motor operating frequency; and first phase current and second phase current of the motor are obtained according to the operating angle of the rotor in the next control beat. By the single-resistor current sampling method and system provided by the invention, the integrity of the single-resistor current sampling scheme in the motor operating process is ensured; and the single-resistor current sampling effect is improved.

Description

technical field [0001] The invention relates to the technical field of motor control, in particular to a single-resistance current sampling method and system. Background technique [0002] The technology of using a single resistor to sample the current of the three phases of the motor has the advantages of simple control circuit and low cost, so it is gradually replacing the current sampling methods used for motor control such as dual-resistor and three-resistor sampling. In the actual operation of single-resistor current sampling, it is necessary to ensure the adequacy of the sampling time. The basic principle is to use the duty cycle compensation method to increase the maximum duty cycle and decrease the minimum duty cycle. [0003] The traditional sampling scheme generally tries to move the phase of the modulating wave under the premise of keeping the duty cycle constant, so that the time between the maximum duty cycle and the middle duty cycle, the middle duty cycle and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P23/14
CPCH02P23/14
Inventor 李云欢
Owner GUANGZHOU SHIYUAN ELECTRONICS CO LTD
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