PWM control-based motor phase current detection method and air conditioner

A detection method and phase current technology, which is applied to the phase current detection of motors and the field of air conditioners, and can solve problems such as inaccurate current detection

Pending Publication Date: 2021-03-05
QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the above-mentioned problems in the prior art, that is, to solve the problem of inaccurate current detection in the existing single-resistor current sampling method, the present invention provides a phase current detection method of a motor based on PWM control. Current sensing methods include:

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  • PWM control-based motor phase current detection method and air conditioner
  • PWM control-based motor phase current detection method and air conditioner

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Embodiment Construction

[0030] Preferred embodiments of the present invention are described below with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the present invention, and are not intended to limit the protection scope of the present invention. For example, although the following embodiments are described in conjunction with the motor of the air conditioner compressor, this is not limiting, and those skilled in the art can obviously adjust the application scenarios of the present invention, and this adjustment does not deviate from the basic principles of the present invention. Principle, therefore also will fall within the scope of protection of the present invention. For example, the phase current detection method of the present application can also be applied to refrigerators, washing machines and the like.

[0031] First refer to figure 1 , to describe the phase current detection...

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Abstract

The invention relates to the technical field of current detection, in particular to a motor phase current detection method based on PWM control and an air conditioner. The invention aims to solve theproblem of inaccurate current detection of an existing single-resistor current sampling method. In order to achieve the purpose, the phase current detection method comprises the steps: in the motor starting process, detecting a current signal of a direct-current bus of a motor; when the current signal of the direct current bus is detected, reducing the PWM carrier frequency of the motor; and calculating the phase current of the motor according to the current signal of the DC bus. The PWM carrier frequency of the motor is reduced while the current signal of the direct-current bus of the motor is detected, so that the current waveform duration is prolonged, the current is more easily collected, and the collected current is more accurate.

Description

technical field [0001] The invention relates to the technical field of current detection, in particular to a phase current detection method of a motor based on PWM control and an air conditioner. Background technique [0002] The traditional compressor driving algorithm often uses three-resistor sampling to detect the currents of U, V, and W phases as feedback values, but the cost of this method is relatively high, and the detection components are large in size and difficult to integrate in the circuit. In theory, one-shunt current detection is also feasible. By connecting the sampling resistor in series to the DC bus to detect the total current at different times, and then based on the relationship between the three-phase currents, you can indirectly convert U, V, W phase current. [0003] However, since the speed of the compressor is not high when the compressor is just started, the PWM pulse width difference is small, which leads to the fact that the duration of the curr...

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Application Information

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IPC IPC(8): H02P1/42H02P27/08
CPCH02P1/42H02P27/085H02P27/08
Inventor 冯正阳邵海柱耿焱时斌丛安平张波
Owner QINGDAO HAIER AIR CONDITIONING ELECTRONICS CO LTD
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