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Frequency converter brake control method and circuit and air conditioner

A braking control and frequency converter technology, applied in the field of frequency converters, can solve the problems of complex brake control circuit design and achieve the effect of electric energy discharge

Active Publication Date: 2020-06-16
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the defect of complex design of the existing braking control circuit, the present invention proposes a frequency converter braking control method, a circuit and an air conditioner. Transform bridge for brake control

Method used

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  • Frequency converter brake control method and circuit and air conditioner

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Embodiment Construction

[0024] Such as figure 1 As shown, the present invention proposes a frequency converter braking control method based on the frequency converter's own circuit. The frequency converter is provided with a three-phase inverter bridge connected to the bus voltage and the motor. The three-phase inverter bridge is provided with a There are three branches on the voltage, and each branch has two upper and lower bridge arms. Each bridge arm is composed of an IGBT and an anti-parallel diode. The three branches correspond to the three-phase windings of the motor. The upper bridge IGBT and The intermediate points between the lower bridge IGBTs are connected to their corresponding windings. The upper bridge IGBTs on the three branches are V1, V3 and V5 respectively, and the lower bridge IGBTs on the three branches are V4, V6 and V2 respectively.

[0025] The braking control method includes the following steps: judging whether a motor braking signal is received, and if so, entering the brakin...

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Abstract

The invention discloses a frequency converter brake control method and circuit and an air conditioner. A frequency converter is provided with a three-phase inverter bridge connected with bus voltage and a motor. The brake control method comprises the steps of judging whether a motor brake signal is received or not; and if so, entering a brake control mode, wherein the brake control mode comprisesthe steps that lower bridge IGBTs in the three-phase inverter bridge are switched on at the same time, upper bridge IGBTs in the three-phase inverter bridge are switched off at the same time, after the lower bridge IGBTs in the three-phase inverter bridge are switched on at the same time, the actual voltage value of the bus voltage is collected, and the on-off state of the lower bridge IGBTs is dynamically adjusted according to the actual voltage value. According to the invention, electric energy discharge is realized under the condition of not additionally adding a hardware circuit, and the on-off state of the lower bridge IGBT is dynamically controlled according to the sampling signal of the bus voltage in the brake control process, so that the motor braking speed and the rising amplitude of the bus voltage are controlled.

Description

technical field [0001] The invention relates to the technical field of frequency converters, in particular to a frequency converter braking control method, a circuit and an air conditioner. Background technique [0002] With the increasingly fierce market competition, the current commercial air-conditioning compressor drive inverter solution is developing in the direction of multi-function. In order to improve the user experience, the motor control of the commercial air-conditioning outdoor unit fan needs to be compatible with both forward and reverse control, and can quickly Connect to realize quick switching of heat dissipation and dust removal functions. For the requirements of motor control, in order to be able to realize rapid transition from forward rotation to reverse rotation control, braking control must be implemented first, otherwise there will be a situation of out-of-control startup and shutdown protection. [0003] The processing method in the prior art is as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02P27/08H02P23/20H02P3/18
CPCH02P3/18H02P27/08H02P23/20
Inventor 贺小林杨湘木刘文斌李东涛
Owner GREE ELECTRIC APPLIANCES INC
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