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SPWM inverter principle and its control principle
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It is used to study the generation principle and application of SPWM. It is used to realize the control of pure sine wave inverter. By modulating a series of pulses with different width, the sine wave (amplitude, phase and frequency) can be equivalent. How to use square wave with different width to equivalent sine wave is the basic idea of SPWM modulation, which ensures the fundamental wave corresponding to square wave with different width and the required frequency The amplitude, phase and frequency of the sine wave to be equivalent are equal
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Rc522 program based on stc52
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Based on STC89C52 rc522 RF card application, through STC89C52 programming, receive rc522 RF card information, judge, read card number and card ID, set range, when the card is not in this range, alarm through buzzer, display card ID on LCD
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Phase locked loop technology
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This paper introduces in detail some problems encountered in the grid connection of inverter, including the causes and solutions of current and voltage over-current, voltage under current and voltage under voltage problems, the phase problems of three-phase AC in the process of grid connection, and how to use PLL technology to solve some problems in grid connection.
1412333938 0 0
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