Apparatus and method for automatically offsetting linear...

Details Apparatus and method for automatically offsetting linear... Apparatus and method for automatically offsetting linear...

2008-07-01

2008-07-01

Wells, Kenneth B. (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Converting input current or voltage to output frequency

C327S102000

Reexamination Certificate

active

11621106

ABSTRACT:
An apparatus and method for automatically offsetting the linear deviation of a V/F converter, the offset adjust pin of which is connected to a fixed resistance, and the frequency output pin of which is connected to a microcontroller unit (MCU) via an opto-isolator, a standard V/F transfer function being pre-stored in the MCU, wherein standard frequencies F1and F0(i.e., two coordination points (V1, F1) and (V0, F0)) are output by the V/F converter, when V1and V0are input as standard voltages, and the MCU may detect an error status in the V/F converter, when the V/F converter obtains real output frequencies F1′ and F0′ from real input voltages V1and V2, and standard coordination points (F1, K1) and (F0, K0) will be corrected to (F1′, K1) and (F0′, K0′), from which a transfer function of offsetting frequency down is obtained, when the MCU processes a frequency down procedure.

REFERENCES:
patent: 4232192 (1980-11-01), Beex
patent: 4592785 (1986-06-01), Reinert et al.

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