38results about How to "Reduce calculation bias" patented technology

The invention discloses a method and a device for adjusting a step-up ratio of a PFC (power factor correction) circuit. The method comprises following steps: an input current instantaneous value and an input voltage instantaneous value of the PFC circuit are detected, and an input current average value and an input voltage average value are calculated respectively; a direct current bus voltage set value of an output end of the PFC circuit and a withstand voltage upper limit value of an electrolytic capacitor are acquired, an adjusting upper limit of the step-up ratio is acquired according to the withstand voltage upper limit value and the input voltage average value, and a first adjusting lower limit and a second adjusting lower limit of the step-up ratio are acquired according to the direct current bus voltage set value and the input voltage average value respectively; the change trend of the input current is judged according to the input current instantaneous value and the input current average value; when the input current is in a steady state or a rising process, an adjusting range of the step-up ratio is acquired according to the adjusting upper limit and the first adjusting lower limit; when the input current is in a falling process, an adjusting range of the step-up ratio is acquired according to the adjusting upper limit and the second adjusting lower limit. Therefore, more rapid and more accurate voltage control effect can be realized.

The invention belongs to the field of air conditioners, and specifically provides a method for measuring the power consumption of internal units of multi-connected air conditioners. The purpose of the present invention is to solve the problems of cumbersome operation and large deviation in the existing measurement method. The measurement method of the present invention includes: based on the operating data of the m-th internal machine in the current unit time period k, calculate the The real-time power NPi of the fan m(t＝k) And the standby power DP of the electric control board m(t＝k) ;Based on the real-time power and standby power, calculate the power consumption parameter NP of the m-th indoor unit in the current unit time period k m(t＝k) ;Based on the power consumption parameter NP in the current unit time period k m(t＝k) and the total power consumption parameter ZNP in the previous unit time period (k-1) m(t＝k‑1) , calculate the total power consumption parameter ZNP of the m-th indoor unit in the current unit time period k m(t＝k) ;Based on the total power consumption parameter ZNP of the m-th indoor unit m(t＝k) , calculate the total power consumption ZNH of the m-th indoor unit in the current unit time period k m(t＝k) . Through the above method, the multi-connected indoor unit does not need to install multiple electricity meters, the operation is simple, and the measurement error is reduced at the same time.

The invention discloses a method for detecting defects of a printed circuit board (PCB) based on skeleton extraction and range conversion. The method comprises the following steps of: checking an index table to extract a single-pixel skeleton; deleting skeleton branches; and searching for range value domain abnormity, and classifying PCB defects according to abnormal conditions. According to the method for detecting defects of the PCB based on skeleton extraction and range conversion, useless points can be deleted on the premise of not influencing the quantity of connected domains by extracting the single-pixel skeleton in a way of checking the index table, and the extracted skeleton is of a single pixel and has high generality and high practicability; skeleton branches are deleted, and range value domain abnormity is searched, so that calculation deviations can be reduced without influencing the speed and accuracy of skeleton tracking; and branches can be deleted, so that the calculation amount of skeleton search is reduced, and the efficiency of defect identification is increased.

The invention discloses a system and method for calculating the utilization rate of wind power energy, which includes a real-time database and a historical database, and also includes an online monitoring module for the status of a wind power generator connected to the real-time database and the historical database, and a data processing module for a sample group of a wind power generator , wind turbine total power generation recording service module, wind turbine indicator period calculation service module and user interaction module, which can solve the current problems in the industry when calculating this indicator, such as diverse wind turbine models, inconsistent status division of wind turbines, and index Low calculation accuracy and other technical problems. At the same time, the sample group framework introduced by it and the judgment and processing of the effective marks of samples reduce the calculation error of a single sample, avoid the problem that the theoretical power generation cannot be calculated due to the abnormality of a single sample, and realize the flexible calculation of indicators of each dimension It is a general data processing technique for calculating such indicators.

The invention discloses an imaging method, device and mobile terminal. The imaging method includes: using a prism group to perform total reflection and spectroscopic processing on light entering from a lens of a camera to form two parts of light; and imaging the two parts of light through the first camera assembly and the second camera assembly respectively. In the present invention, since the light received by the sensors of the two camera assemblies comes from the same optical path, there is no deviation in the image, and pixel-level alignment can be achieved, and the structure also ensures that the thickness of the mobile terminal does not increase, and then there is no need to consider the image when the dual-camera image fusion Bias, reducing software cost and computational bias.

The invention provides automatic measuring equipment for an inclining test of a fishing boat. The automatic measuring equipment comprises a folded shrinkable support module, a signal acquisition module, a remote control module and a trough. An acceleration sensor tests the gravity acceleration of a pendulum in different states; a displacement sensor tests the swing amplitude of the pendulum; the signal acquisition module stores and operates the pendulum test data; and a low-power-consumption WIFI module sends the test data to a PC terminal or mobile phone terminal APP, and the PC terminal or mobile phone terminal APP receives the data and performs data verification to generate an inclining test report, thereby integrating a process test. Test errors caused by manual reading are reduced, the test accuracy is improved, and the automatic measuring equipment with an integrated folded shrinkable structure is convenient to carry and use.