7 results about "Voltage compensation" patented technology

The invention relates to a line voltage compensation circuit based on peak detection current mode switch circuit. The line voltage compensation circuit provided by the invention comprises a sample circuit and a compensation circuit, wherein, the sample circuit is used for sampling voltages related with the line voltage, thus obtaining sampling voltages which are in linear relation with the line voltage and scaling down in proportion. The compensation circuit is connected with the sample circuit and is used for compensating the non-inverting input end or inverted input end of a comparator in the peak detection circuit by utilizing the sampling voltage of the output by the sample circuit in an electrical signal mode, so that the inductance peak point current is equal to the inductance peak point current under the ideal situation. The line voltage compensation circuit provided by the invention not only has the advantages of steady loop and quick reaction speed and the like in the traditional peak detection current mode switch control circuit, but also can be used for overcoming the problem of unstable inductance peak point current caused by system delay, so that the inductance peak point current is invariant. The line voltage compensation circuit provided by the invention can be widely applied to analogue integrated circuits.

The invention discloses a black frame voltage compensation method for a data driver of an OLED display, and the method comprises the following steps: giving out a plurality of set point voltages which at least comprise a highest-order voltage, a lowest-order voltage, and at least one-order voltage between the highest-order voltage and the lowest-order voltage; building a voltage curve of a data driver based on the set point voltages; enabling the highest-order voltage to be set independent of the voltage curve; and independently pulling up the highest-order voltage. Through the independent giving of a black frame voltage, the method enables the black frame voltage to be independent for adjustment, thereby enlarging range of circuit operation and exerting no impact on the setting of gray scale voltages. Through the setting of the independent black frame voltage, the method can increase the difference between the black frame voltage and the voltage of one gray scale which is one gray scale less, improves the tolerance for current leakage of a thin film transistor (TFT) assembly, and can solve a problem that the current leakage of the assembly causes the slight lighting of the frame which affects comparison.

The method invention provides a distribution network voltage drop compensation control method for photovoltaic grid connection. The method is implemented by a UPQC and comprises the following steps of: 1, acquiring a voltage signal; 2, conditioning the acquired signal; 3, calculating a voltage compensation instruction by sampling a voltage signal, processing the voltage compensation instruction by using an endocrine feedback system PI ultra-short feedback control method and then outputting a PWM wave; and 4, according to a voltage compensation control PWM signal, outputting corresponding compensation voltage in order to compensate the voltage of the distribution network. In a conventional PI control method of the UPQC for distribution network voltage drop compensation, a ultra-short feedback processing unit established on the basis of a body neuroendocrine feedback system gland hormone feedback regulation theory is used to assist the PI control, thereby improving the precision and accuracy of voltage drop compensation control of UPQC, which provides a new method for the power quality management of a PV-containing distribution network by the UPQC.