Anti-voltage fluctuation automatic static pressure recognition method and system for air pipe type air conditioning indoor unit
A ducted air conditioner, automatic identification technology, applied in heating and ventilation control systems, heating and ventilation safety systems, heating methods, etc., can solve problems such as up and down fluctuations, control result deviations, non-compliance with requirements, etc., to achieve convenient installation design , enhanced capabilities and adaptability, improved stability and operational efficiency
Active Publication Date: 2013-12-25
QINGDAO HISENSE HITACHI AIR CONDITIONING SYST
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[0005] In the case of stable 220V input voltage, according to the above patent method, the control result is very accurate, and the output static pressure error is less than 10%, which meets the requirements; however, in the actual use process, the grid voltage is not stable 220V, but will appear Fluctuating unstable state, in this case, the control results of the above-mentioned patent method will have a large deviation, which does not meet the requirements
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[0035] Such as figure 1 As shown, the modulation rate M is directly proportional to the control voltage VSP, and the control voltage VSP is changed to 1 / K under the rated conditions to ensure that the output speed remains unchanged.
[0036] The single-chip microcomputer in the electronic control box obtains the accurate value of the grid voltage through AD conversion. Under normal circumstances, it should be the DC voltage Vdc=310V obtained after 220V AC is rectified and filtered by the silicon bridge. When the grid voltage fluctuates, the corresponding rectified DC voltage Vdc is Will change; according to the line voltage Vu unchanged, the output speed of the DC current of the Toshiba TB6551FG driver chip is unchanged, and the calculation formula of the two-phase modulation line voltage is as follows:
[0037]
[0038] It can be seen that when the grid voltage fluctuates, if Vdc becomes K times the normal value, then the modulation rate M is changed to 1 / K, and the line voltage V...
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The invention provides an anti-voltage fluctuation automatic static pressure recognition method and an anti-voltage fluctuation automatic static pressure recognition system for an air pipe type air conditioning indoor unit. A VSP correction coefficient K and voltage detection balance module is additionally arranged in the conventional anti-voltage fluctuation automatic static pressure recognition method and anti-voltage fluctuation automatic static pressure recognition system, so that automatic static pressure recognition of the air pipe type air conditioning indoor unit and static pressure adjustment of a project site can still be realized well during voltage fluctuation of a power grid, the voltage fluctuation balance capacity and adaptability are improved, the mounting design of the site is facilitated, and the stability and the operation efficiency of the system are improved.
Description
technical field [0001] The invention relates to an automatic static pressure identification method and system of an air conditioner, in particular to an automatic static pressure identification method and system of an air duct type air conditioner indoor unit under the condition of grid voltage fluctuation. Background technique [0002] When the ducted air conditioner indoor unit is installed on the project site, the installation environment is different, and there will be different static pressure requirements. The traditional air duct machine uses an AC asynchronous motor, and the appropriate static pressure specification must be selected according to the design of the air duct on the project site. Due to the lack of standardization in the installation and construction of domestic air conditioners, static pressure mismatches often occur, which affects the comfort and reliability of the product. At the same time, air-conditioning equipment manufacturers need to produce air...
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IPC IPC(8): F24F11/00
Inventor 林文涛何成军赵晓青甘国瑞
Owner QINGDAO HISENSE HITACHI AIR CONDITIONING SYST