Single-resistor current sampling method and air conditioner

A single-resistance sampling and current sampling technology, applied in the field of electronics, can solve the problem of low sampling current accuracy, and achieve the effect of accurate three-phase current values

Active Publication Date: 2016-05-04
SICHUAN CHANGHONG ELECTRIC CO LTD
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Problems solved by technology

[0006] The application provides a single-resistance current sampling method and air-conditioning equipment, which are used to solve the technical problem of low accuracy of the sampling current obtained when the single-resistance current sampling is performed on the motor of the air-conditioning equipment

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Embodiment Construction

[0022] The application provides a single-resistance current sampling method and air-conditioning equipment, which are used to solve the technical problem of low accuracy of the sampling current obtained when single-resistance current sampling is performed on a motor of the air-conditioning equipment.

[0023] In order to solve the above technical problems, the general idea of ​​the technical solution provided by the embodiment of the present invention is as follows:

[0024] In this application, in the process of modulating the PWM wave used to control the motor with a triangular wave, the three phase currents of the motor can be obtained in the duration of the high level corresponding to each phase current in the PWM wave corresponding to the triangular wave, so that according to The duration of the high level and the delay time of the current on the IGBT can set the corresponding first sampling point and the second sampling point. Since the delay time of the current on the IG...

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Abstract

The invention provides a single-resistor current sampling method and an air conditioner, and aims at solving the technical problem that the sampling current obtained via single-resistor current sampling for a motor of the air conditioner is relatively low. The method comprises that in the process that triangular waves are used to modulate the motor, three phases of currents of the motor as well as the high-level duration time corresponding to each phase of current in PWM waves corresponding to the triangular waves are obtained, and the period of the PWM waves is the same with that of the triangular waves; according to the high-level duration time and the current delay duration time of an IGBT in a single-resistor sampling circuit corresponding to the motor, a first sampling point and a second sampling point are set; and single-resistor current sampling is carried out on the motor according to the first and second sampling points, and three phases of current values of the motor are determined.

Description

technical field [0001] The invention relates to the field of electronic technology, in particular to a single-resistance current sampling method and air-conditioning equipment. Background technique [0002] During the operation of the permanent magnet synchronous brushless DC motor, it is usually necessary to sample the phase currents of the three-phase coils of the motor to realize the closed-loop control of the motor. [0003] In the traditional three-phase current sampling method of a motor, three resistors or two resistors are often used to sample the motor current. However, since the control circuit using dual-resistor and three-resistor sampling is more complicated and the production cost is higher, the method of using a single resistor to sample the current of the three phases of the motor gradually replaces the traditional sampling method. [0004] At present, when using the single-resistor current sampling method to sample the phase current of the motor, the phase ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R19/25F24F11/00
CPCF24F11/00F24F11/70G01R19/25
Inventor 陈跃刘启武涂小平王声纲朱绯
Owner SICHUAN CHANGHONG ELECTRIC CO LTD
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