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Three-phase motor driving circuit and method

A technology for three-phase motors and drive circuits, applied in emergency protection circuit devices, electrical components, AC motor control, etc., can solve problems such as damage to MOS switches, and achieve the effect of avoiding power consumption increases

Active Publication Date: 2022-05-06
ANPEC ELECTRONICS CORPORATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the switching sequence turns off the lower bridge switch, the current flowing to the node will flow to the power supply to cause the voltage to be too high and damage the MOS switch

Method used

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  • Three-phase motor driving circuit and method
  • Three-phase motor driving circuit and method
  • Three-phase motor driving circuit and method

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Embodiment Construction

[0032] The following is an illustration of the implementation of the "three-phase motor drive circuit and method" disclosed in the present invention through specific specific embodiments. Those skilled in the art can understand the advantages and effects of the present invention from the content disclosed in this specification. The present invention can be implemented or applied through other different specific embodiments, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the concept of the present invention. In addition, the drawings of the present invention are only for simple illustration, and are not drawn according to the actual size, which is stated in advance. The following embodiments will further describe the relevant technical content of the present invention in detail, but the disclosed content is not intended to limit the protection scope of the present invent...

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Abstract

The invention discloses a three-phase motor driving circuit and method. The three-phase motor driving circuit comprises an inverter circuit, a control circuit, a turn-off module, a turn-off confirmation module and a turn-on logic unit. The inverter circuit includes a plurality of phase circuits, each including an upper bridge switch and a lower bridge switch. The control circuit operates in a feedback mode to output a feedback starting signal. The turn-off module comprises a feedback detection unit, a voltage regulation unit and a turn-off logic unit. And the feedback detection unit detects the output current of the output node of the specified phase circuit, if the output current flows out of the output node, a voltage regulation signal is output, and when the output current is zero, a lower bridge switch turn-off signal is output. The voltage adjusting unit adjusts the voltage of the output node to be close to a preset voltage, and the turn-off logic unit controls the lower bridge switch to be switched off in a feedback mode.

Description

technical field [0001] The invention relates to a three-phase motor drive circuit and method, in particular to a three-phase motor drive circuit and method for preventing reverse current flowing to a power supply. Background technique [0002] With the advancement of technology, motors have become indispensable electronic devices. Common motors, such as DC motors, AC motors, stepping motors, etc., have been widely used to drive fans. [0003] The motor includes an upper bridge switch, a lower bridge switch and a drive circuit. The driving circuit is used for controlling the turning on (Turn On) or closing (Turn Off) of the upper bridge switch and the lower bridge switch. The upper bridge switch and the lower bridge switch are related to the working condition of the motor. Furthermore, the drive circuit controls the conduction of the upper bridge switch and the lower bridge switch to change the polarity of the coil of the motor with the output voltage. The polarity of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/085H02P27/08
CPCH02H7/0858H02P27/085H02P27/08H02P6/157H02P6/182
Inventor 陈昆民
Owner ANPEC ELECTRONICS CORPORATION