Smart power module and variable frequency drive

A technology of intelligent power module and variable frequency drive, which is applied in the direction of converting AC power input to DC power output, output power conversion device, AC motor control, etc., and can solve problems such as damage to the variable frequency drive

Active Publication Date: 2017-09-08
GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The main purpose of the present invention is to propose an intelligent power module and variable frequency drive, aiming to solve the problem of damage to the variable frequency drive caused by the current flowing through the compressor being greater than the preset value due to pressure and other reasons

Method used

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  • Smart power module and variable frequency drive
  • Smart power module and variable frequency drive
  • Smart power module and variable frequency drive

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Embodiment Construction

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

[0032] It should be noted that if there is a directional indication (such as up, down, left, right, front, back...) in the embodiment of the present invention, the directional indication is only used to explain the position in a certain posture (as shown in the accompanying drawing). If the specific posture changes, the directional indication will also change accordingly.

[0033] In addition, if there are descriptions involving "first", "second" and ...

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Abstract

The invention discloses a smart power module and a variable frequency drive. The smart power module includes an upper bridge arm drive circuit and a lower bridge arm drive circuit connected with an inverter bridge separately; an overcurrent protection mode selecting circuit used for receiving and outputting overcurrent protection mode signals; an overcurrent protection time delay circuit used for receiving and outputting overcurrent protection time delay signals; an overcurrent protection circuit used for outputting overcurrent detection signals after detecting that current flowing to a load connected with the smart power module is greater than a preset current value; an inverter bridge control logic circuit used for controlling the engagement and disengagement of the upper bridge arm drive circuit and/or the lower bridge arm drive circuit according to the overcurrent protection mode signals, the overcurrent protection time delay signals and the overcurrent detection signals. According to the invention, damage of the variable frequency drive caused by that current flowing through a compressor is greater than a preset value due to factors such as pressure and the like is avoided.

Description

technical field [0001] The invention relates to the technical field of electronic circuits, in particular to an intelligent power module and a variable frequency driver. Background technique [0002] At present, the mainstream inverter air conditioner driver adopts the AC-DC-AC mode. First, the grid AC power is rectified into DC power, and then the DC power is converted into three-phase AC power through the intelligent power module, and then supplied to the air conditioner compressor to drive the compressor. When the compressor is running, it drives the refrigerant to circulate in the air conditioning system to achieve cooling or heating. [0003] During the working process of the compressor driven by the variable frequency drive, when the compressor is under severe working conditions, for example, when the system pressure causes the compressor current to be too large, the permanent magnet material of the motor rotor of the compressor will be demagnetized due to overcurrent,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/122H02M7/5387H02P27/06
CPCH02H7/122H02M7/5387H02P27/06
Inventor 霍军亚
Owner GD MIDEA AIR-CONDITIONING EQUIP CO LTD
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