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Motor driving device and method, air conditioner and computer readable storage medium

A technology of motor drive and current detection device, applied in the direction of AC motor control, heating method, electrical components, etc., can solve the problems of conduction interference, cost increase, output voltage deviation, etc., to eliminate current distortion, small variation, and compensate for voltage deviation. shift effect

Active Publication Date: 2021-10-22
NINGBO AUX ELECTRIC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The problem solved by the present invention is that in the prior art, in order to solve the conduction interference or leakage current when the motor is driven, an additional circuit needs to be set up, which increases the cost, and the setting of the dead time in the motor drive will lead to deviations in the output voltage

Method used

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  • Motor driving device and method, air conditioner and computer readable storage medium
  • Motor driving device and method, air conditioner and computer readable storage medium
  • Motor driving device and method, air conditioner and computer readable storage medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] This embodiment provides a motor drive device for driving a motor 10, the motor 10 is a three-phase motor, such as figure 1 As shown, it includes a pre-stage processing circuit and a three-phase inverter circuit. The pre-stage processing circuit is used to input the alternating current output from the power supply into the three-phase inverter circuit. The three-phase inverter circuit includes an upper bridge arm The power line and the power line of the lower arm, and between the power line of the upper arm and the power line of the lower arm, the switching element of the upper arm and the switching element of the lower arm connected in series in each phase, the upper arm of each phase The connection point of the switch element and the lower bridge arm switch unit is connected to the motor 10, and also includes a control device 11, and the control device 11 is used to control the switching timing of the upper bridge arm switch element and the lower bridge arm switch elem...

Embodiment 2

[0090] This embodiment discloses a motor driving method, and the motor driving method adopts the motor driving device as described in Embodiment 1.

[0091] The motor driving method is used to drive the motor 10, and the motor 10 is a three-phase motor. The driving method includes: controlling the switching timing of the switching elements of the upper bridge arm and the switching elements of the lower bridge arm of each phase of the motor 10. In the cycle Tc, there is at least one moment when the switching elements of the upper bridge arm or the switching elements of the lower bridge arm between different two phases of the motor 10 perform opposite switching actions at the same time, and the opposite switching actions refer to that the upper bridge arm or the lower bridge arm In the arm, the switching element of one phase is turned on, and the switching element of the other phase is turned off. The change of the phase voltage of one phase of the motor 10 is used to offset the ...

Embodiment 3

[0111] This embodiment discloses an air conditioner, which includes the motor drive device described in Embodiment 2.

[0112] For the air conditioner disclosed in this embodiment, it includes a computer-readable storage medium and a processor storing a computer program. When the computer program is read and run by the processor, the motor drive described in Embodiment 2 is realized. method.

[0113] The air conditioner has the same advantages as the motor driving method described in Embodiment 1 over the prior art, and will not be repeated here.

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Abstract

The invention provides a motor driving device and method, an air conditioner and a computer readable storage medium. The motor driving device comprises a pre-stage processing circuit and a three-phase inverter circuit, wherein the pre-stage processing circuit is used for inputting alternating current output by a power supply into the three-phase inverter circuit; the connection point of the upper bridge arm switch element and the lower bridge arm switch unit of each phase of the three-phase inverter circuit is connected with the motor, and the control device is used for offsetting conducted interference and leakage current caused by the change of the phase voltage of one phase of the motor. A current detection device is arranged in a driving loop; changing the switching timing and pulse width of the upper and lower arm switching elements of each phase according to the current direction detected by the current detection device; and the waveform of the phase voltage applied to the motor is controlled, so that the voltage offset caused by dead time can be effectively compensated, and current distortion is eliminated. Meanwhile, the conducted interference and the leakage current generated in the switching process of the other phase are reduced by using the change of the phase voltage of one phase.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a motor drive device, a method, an air conditioner and a computer-readable storage medium. Background technique [0002] For a long time, due to the sharp change of voltage or current generated by the converter and inverter installed in the motor drive device when switching, there is a high-frequency leakage current that flows from the capacitor to the ground, and it will be in the input and output of the switching power supply. Strong conduction interference is generated at the terminal, and leakage current and conduction interference sometimes become the cause of equipment failure or misjudgment in the air conditioner. [0003] Japanese Patent Laid-Open No. Hei 10-094244 discloses a common-mode interference eliminator that uses star-connected capacitors to detect the common-mode voltage generated by semiconductor elements of a voltage-type PWM inverter during switching o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/08F24F11/88
CPCH02P27/085F24F11/88
Inventor 薛秀夫
Owner NINGBO AUX ELECTRIC