| 摘要 |
PROBLEM TO BE SOLVED: To provide a device for automatically correcting the linearity deviation of a voltage/frequency (V/F) converter. SOLUTION: A correction adjustment pin of a voltage/frequency (V/F) converter is connected to a fixed resistor; a frequency output pin is connected to a micro controller unit (MCU) by an opto-isolator; a standard voltage/frequency transfer function is stored in the MCU beforehand; when V1 and V0 are inputted as standard voltages, standard frequencies F1 and F0 (namely, two coordinate points (V1, F1) and (V0, F0)) are outputted by the V/F converter. When the V/F converter obtains actual output frequencies F1' and F0' from actual input voltages V1 and V2, an error state in the V/F converter can be detected by the MCU. When the MCU executes a frequency-down procedure, standard coordinate points (F1, K1) and (F0, K0) are corrected to (F1', K1) and (F0', K0') so as to obtain the transfer function for the frequency-down correction. COPYRIGHT: (C)2008,JPO&INPIT
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