Control method and control device for PFC (Power Factor Correction) circuit
A control method and technology for a control device, which are applied to output power conversion devices, electrical components, high-efficiency power electronic conversion, etc. Anti-grid voltage abnormal fluctuation ability and anti-interference ability, improve comfort, avoid frequent start and stop effects
Active Publication Date: 2018-09-11
GREE ELECTRIC APPLIANCES INC
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Problems solved by technology
[0004] However, for the above-mentioned existing PFC circuit control method, the PFC circuit is only tried to be turned on once during the operation of the unit, but in actual use, the power grid voltage in some areas is unstable or frequently interfered, which may easily lead to abnormal operation of the PFC circuit, which in turn causes the air conditioner to fail. The frequent start and stop of the unit not only affects the user experience, but also fails to achieve the effect of frequency conversion and energy saving
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[0042] The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.
[0043] see image 3 , image 3 It is a flow chart of a control method of a PFC circuit provided in an embodiment of the present invention, and the control method of the PFC circuit includes:
[0044] Step S1: After the PFC circuit in the frequency converter is turned on, it is detected whether the PFC circuit is working abnormally, and when it is detected that the PFC circuit is working abnormally, step S2 is executed;
[0045] Step S2: controlling the PFC circuit to be turned off, and then performing step S3;
[0046] Step S3: Detect whether the load power of the frequency converter is greater than a preset start-up power value, if so, restart the PFC circuit, and repe...
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The present invention provides a control method and control device for a PFC (Power Factor Correction) circuit. The control method of the PFC circuit includes the following steps that: step S1, whether an PFC circuit in a frequency converter works abnormally is detected after the PFC circuit is turned on, when it is detected the PFC circuit works abnormally, a step S2 is performed; step S2, the PFC circuit is controlled to be switched off, and then a step S3 is performed; step S3, whether the load power of the frequency converter is greater than a preset switch-on power value is detected, if the load power of the frequency converter is greater than the preset switch-on power value, the PFC Circuit is restarted, and the step S1 is repeated. With the control method and control device of theinvention adopted, the power grid voltage abnormal fluctuation resisting capacity and anti-interference capacity of an air-conditioning unit can be enhanced, the frequent start and stop of the unit where the frequency converter is located can be avoided, and the comfort of a user can be improved.
Description
technical field [0001] The invention relates to the technical field of air conditioners, in particular to a control method and a control device for a PFC circuit. Background technique [0002] At present, the common inverter circuit topology in household inverter air conditioners is AC-DC-AC structure, such as figure 1 As shown, the input is 220V AC mains, the rectification circuit converts the AC power into DC power, and then the inverter circuit converts the DC power into AC power with adjustable frequency and amplitude to supply load equipment such as compressors or fans. [0003] In order to improve the power supply quality of the power grid and suppress harmonic pollution, some inverters usually add a PFC (Power Factor Correction, power factor correction) circuit (usually Boost type) after the rectifier circuit, such as figure 2 As shown, a common PFC circuit includes an inductor L, a transistor IGBT, and a diode D. The voltage on the bus can be increased through the ...
Claims
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Login to View More IPC IPC(8): H02M1/42
CPCH02M1/4225Y02B70/10
Inventor 李洋刘文斌贺小林李仲阳
Owner GREE ELECTRIC APPLIANCES INC