Frequency converter direct current voltage detection and correction method
A technology of DC voltage and correction method, which is applied in the direction of instruments, measuring devices, and measuring electrical variables, etc., can solve the problems of short service life of frequency converters, achieve the effects of prolonging service life, prolonging working life, and improving user experience
Active Publication Date: 2021-05-14
四川长虹空调有限公司
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Problems solved by technology
[0003] The technical problem to be solved by the present invention is: to propose a method for detecting and correcting the DC voltage of the frequency converter, to solve the problem of short service life of the frequency converter caused by the silver migration of the sampling circuit, and to improve the user experience
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[0030] Taking the application of the present invention to an inverter air conditioner controller as an example, firstly, after the controller is powered on, the peak value VinAD of the AC input voltage is calculated according to the AC voltage detection circuit at the standby time; the DC voltage value V2AD is calculated according to the DC voltage detection circuit.
[0031] Then, according to the attached figure 1 The software control process in the medium calculates the theoretical DC voltage value V1 and the DC voltage sampling value V2. Set the voltage deviation range Ve, when the resistance value of the DC voltage sampling circuit of the air conditioner controller changes due to factors such as silver migration, if |V2-V1|>Ve, then calculate the DC voltage correction coefficient K, otherwise, the controller will operate normally .
[0032] At the same time, according to the set maximum input sampling voltage Vz of the sampling port, it is judged whether the port voltage...
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The invention relates to a frequency converter voltage detection technology, discloses a frequency converter direct current voltage detection and correction method, solves the problem that the service life of a frequency converter is short due to the silver migration problem of a sampling circuit, and improves the user experience. In the power-on initialization detection of the frequency converter, a rear-end direct-current voltage detection value is corrected according to an alternating-current voltage value detected by a front-end alternating-current half-wave detection circuit, and a voltage calculation coefficient is adjusted, so that the direct-current voltage detection basically conforms to an actual value after PFC is started. And within a certain range of detection voltage deviation, according to a set reliable working range, the frequency converter continuously works within the range, and when the reliable working range is about to be exceeded, faults of a direct-current voltage detection circuit are reported to the outside, and maintenance is prompted. The service life of the frequency converter can be prolonged, the continuous work of the frequency converter can be guaranteed within a proper time, a failure prompt is reported in advance, and the user experience is improved.
Description
technical field [0001] The invention relates to frequency converter voltage detection technology, in particular to a frequency converter DC voltage detection and correction method. Background technique [0002] The frequency converter is a device that provides the required power supply voltage according to the actual needs of the motor, and then achieves the purpose of energy saving and speed regulation. For air conditioners, the frequency converter is a control system used to control and adjust the speed of the compressor, so that it is always in the best speed state, thereby improving the energy efficiency ratio. In order to monitor the working status of the frequency converter, it is necessary to detect its output voltage and current, but once the sampling circuit in the prior art has a problem of silver migration, the detection voltage deviates or directly reports a fault directly, which will cause the frequency converter Not working. Contents of the invention [000...
Claims
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Login to View More IPC IPC(8): G01R35/00
CPCG01R35/005Y02B70/10
Inventor 邓平王波傅功锦
Owner 四川长虹空调有限公司