Method of amending phase position collecting error caused by frequency variation in phased rectifier control
A technology of phase-controlled rectification control and frequency change, which is applied in the direction of pulse shaping, measuring electrical variables, measuring devices, etc., can solve the problems of difficult selection of response sensitivity devices, difficult zero-crossing phase errors, and unsatisfactory problems, so as to solve the problem of thyristor replacement The effect of current conduction failure, elimination of zero-crossing error, and easy operation
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[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0026] like image 3 As shown, a method of the present invention for correcting the phase acquisition error caused by the frequency change in the phase-controlled rectification control includes the following steps:
[0027] (1) The synchronous transformer is used to achieve power isolation. After the network voltage signal is isolated by the synchronous transformer, the obtained power supply signal is filtered by a band-pass filter for zero-crossing detection and shaping to remove high-order harmonics and DC components;
[0028] (2) For the filter circuit with fixed parameters and forms, the phase shift deviation is in a fixed function relationship with the frequency of the input signal, that is, the deviation value of the phase shift can be fixed according to the frequency of the input signal;
[0029] (3) Correcting the synchronous z...
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