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Bus voltage control method, fan bus control circuit and air conditioner

A busbar voltage control and busbar voltage technology, which is applied to control generators, control generators through magnetic field changes, control systems, etc. The effect of high bus voltage and protection failure rate

Active Publication Date: 2020-11-13
GREE ELECTRIC APPLIANCES INC
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AI Technical Summary

Problems solved by technology

[0005] In order to solve the above-mentioned technical problems existing in the prior art that the increase in cost and low reliability caused by the increase of the bus voltage caused by the reverse rotation of the fan, the present invention proposes a bus voltage control method, a fan bus control circuit and an air conditioner

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  • Bus voltage control method, fan bus control circuit and air conditioner
  • Bus voltage control method, fan bus control circuit and air conditioner
  • Bus voltage control method, fan bus control circuit and air conditioner

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Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0023] The invention relates to a bus voltage control circuit, which comprises a rectifier, a bus and an IPM module sequentially connected between an AC power supply and an air conditioner fan. The rectifier does not have the function of regulating voltage, but only converts AC to DC. The IPM module is controlled by the controller, and drives the fan after inverting the direct current on the bus. The bus bar is divided into a positive bus bar and a negative bus bar, and a capacitor group C1 is connected between the positive bus bar and the negative bus bar.

[0024] The invention also relates ...

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Abstract

The invention discloses a bus voltage control method, a fan bus control circuit and an air conditioner. The bus voltage control method comprises the following steps: when a fan starts, carrying out field oriented FOC control on an IPM module with a given quadrature axis current I<*>q and a given direct axis current I<*>d serving as current loop input parameters; the method also comprises the following steps: detecting bus voltage Vdc; and when the bus voltage Vdc is larger than a high voltage threshold, adjusting the given direct axis current I<*>d according to the bus voltage Vdc, and stabilizing the bus voltage Vdc. The method does not need to add a hardware circuit, saves a conventional brake circuit, controls the IPM module through software, and controls the bus voltage rise caused byfan reversal at a specified value without feeding back to the grid, thereby not causing power grid interference and damage to a rectifier bridge, reducing bus overvoltage protection failure rate, enhancing fan frequency stability control and reducing over-current protection. Meanwhile, the method has the advantages of not increasing cost and greatly improving reliability.

Description

technical field [0001] The invention relates to a control circuit, in particular to a method for controlling the voltage of a fan bus, a fan bus control circuit and an air conditioner. Background technique [0002] The installation position of the outdoor unit of the air conditioner is not fixed. Some outdoor units are installed outdoors. Due to the influence of the wind direction, the fan sometimes reverses against the wind; some outdoor units are installed in a closed space. For example, the air outlets of multiple units are connected by a closed pipe Summarized to one air outlet and so on. The imbalance of indoor and outdoor air pressure when starting up will also cause the fan to reverse. Often, due to external conditions, the wind turbine is reversed and is in the "generator" state, and the generated energy is reversely charged to the DC bus, which increases the bus voltage, which is prone to excessive bus voltage faults and damage to the rectifier bridge. [0003] At...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P9/30H02P101/15
CPCH02P9/305H02P2101/15
Inventor 方小斌贺小林刘文斌王双骥杨帆于洪涛
Owner GREE ELECTRIC APPLIANCES INC
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