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JP2008172980

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JP2008172980
An apparatus for automatically correcting a linear deviation of a voltage / frequency (V / F)
converter can be realized. A correction adjustment pin of this converter is connected to a fixed
resistor, and a frequency output pin is connected to a microcontroller unit (MCU) by an optical
circuit breaker, and a standard voltage / frequency transfer function is stored in advance in the
MCU, When V1 and V0 are input as the standard voltage, the standard frequencies F1 and F0 (ie
two coordinate points (V1, F1) and (V0, F0)) are output by the V / F converter, and the V / F
converter If the actual output frequencies F1 ′ and F0 ′ are obtained from the actual input
voltages V1 and V2, the MCU can detect an error condition in the V / F converter, and if the MCU
performs a frequency decrease procedure, the standard coordinates The points (F1, K1) and (F0,
K0) can be corrected to (F1 ', K1) and (F0', K0 ') to obtain the transfer function of frequency drop
correction. [Selected figure] Figure 1
Device and method for automatic correction of linear deviations in voltage / frequency
converters
[0001]
The present invention relates generally to voltage / frequency (V / F) converters, and more
particularly to V / F converters for power converters.
[0002]
As the maturity of frequency conversion technology increases, frequency converters are now
very well known and are often found not only in various household appliances (eg air
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conditioners, refrigerators and washing machines) but also It is commonly used in industrial
control.
For frequency converter applications, the TC9400 series from MICROCHIP Company, an
integrated circuit (IC) product that converts analog voltage signals to digital frequency signals, all
of which can be conveniently processed with precision control digitization V / F converters such
as the ADVFC 32 manufactured by ANALOG DEVICE Company are commonly used. In the V / F
converter, the relationship between the input voltage and the output frequency is a linear
transfer function, meaning a direct proportional relationship between these two values. A
correction adjustment pin (for example, the second foot pin of TC9400 series or the first foot pin
of ADVFC 32) is usually arranged in all these V / F converters of IC products and connected with
a variable resistor, and the frequency conversion process is performed by its adjustment. The
transfer function slope is changed so that a more accurate response is obtained between the
frequency output value and the voltage output value. However, this correction adjustment has to
be processed in an artificial manner one by one, and it is very uneconomical to mass-produce
frequency converters because it takes considerable labor and time. Furthermore, the variable
resistance of the portable structure is inferior to the fixed resistance in all because of its accuracy
and durability, the phenomenon of resistance fluctuation often occurs, and it affects the V / F
converter accuracy. On the other hand, although the use of the microcontroller unit as a
frequency converter for digital control processing is very many, the conventional frequency
converter does not use the microcontroller for the correction of the carrier deviation of the V / F
converter. Therefore, if the current microcontroller can be used for automatic correction with
linear deviation of voltage / frequency conversion, not only can the labor cost and time requiring
conventional artificial adjustment be saved completely without additional factor costs but also
using variable resistance Can also prevent the problem of instability caused by
[0003]
In view of the drawbacks described below, the present invention provides an apparatus and
method for automatically correcting the linear deviation of a V / F converter, and errors in the V
/ F converter can be automatically performed by a microcontroller unit (MCU) without artificial
operation. Correction, resulting in effective reduction of manufacturing costs. The present
invention provides an apparatus and method for automatic correction of linear deviations in a V /
F converter that uses fixed resistances instead of variable resistances that are more expansive
and less unstable, such that the frequency controller Life and stability can be particularly
developed. In order to achieve this object, the invention connects the correction adjustment pin
of the V / F converter to a fixed resistor and connects the frequency output pin to the
microcontroller unit (MCU) by means of an optical interrupter. If the standard voltage /
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frequency transfer function is stored in advance in the MCU and V1 and V0 are input as standard
voltages, the standard frequencies F1 'and F0' (ie, two coordinate points (V1, F1) and (V0) are
provided. , F0)) by the V / F converter, and when the V / F converter obtains the actual output
frequencies F1 ′ and F0 ′ from the actual input voltages V1 and V2, the MCU uses the V / F
converter to generate When the MCU performs a frequency decrease procedure, correct the
standard coordinate points (F1, K1) and (F0, K0) to (F1 ', K1) and (F0', K0 '). It is possible to
obtain a transfer function that compensates for the frequency drop.
BEST MODE FOR CARRYING OUT THE INVENTION
[0004]
The technical contents and detailed description of the present invention will be described below
in conjunction with the attached drawings. Referring first to FIG. 1, which is a block diagram of
the device of the invention consisting mainly of voltage / frequency (V / F) converter 1 and
microcontroller 2 (MCU). The frequency signal outputs 13 and 14 of the V / F converter 1 are
preferably combined with the input sides 21 and 22 of the MCU 2 by means of an optical
interrupter 3 which can filter the direct current (DC) component of the frequency signal output
from the V / F converter 1 Are electrically connected in series. The voltage input 11 of the V / F
converter 1 is electrically coupled to the voltage signal source Vin, while the correction
adjustment pin 12 is coupled to the fixed resistor 15 to provide a fixed correction value to the V
/ F converter. In this case, the correction procedure and the frequency decrease management are
performed on the frequency signal input of the V / F converter by the MCU 2. The output
frequency of the entire integrated circuit product in the general type V / F converter 1 is in the
kilohertz (kHz) range, for example, the full scale frequency of 10 kHz, 100 kHz and 500 kHz of
the ADVFC 32 and 100 kHz of the full scale frequency of the TC9400. The MCU2 must perform a
frequency down procedure on the high frequency signal input of the V / F converter 1 as it
significantly exceeds the required frequency band 0-60 Hertz (Hz), so that the frequency down
on the MCU2 output 23 The signal output achieves the need for the subsequent inverter control.
Therefore, the relationship between the input and output of both the V / F converter 1 and the
MCU 2 can be expressed respectively as a voltage / frequency (V / F) transfer function and a
frequency down transfer function which are linear functions. That is, the V / F transfer function
can be expressed as F (V) = aV + b, and the frequency down transfer function can be expressed as
K (F) = cF + d, where a, b, c and d are constants. FIG. 2 shows a flowchart of the deviation
correction method of the invention including the following procedure. Step 1: First of all, the
standard V / F transfer function and the standard frequency descent transfer function are used
as MCU2, and two correspondence relationships of (V1, F1), (V0, F0) and (F1, K1), (F0, K0) are
respectively Set up two transfer functions. That is, when the input voltage is V1, the
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corresponding frequency of the V / F converter is F1 which is a frequency drop with respect to
K1. If the input voltage is V0, then the frequency of the V / F converter has to be F0 which is a
frequency drop with respect to K0. Step 2: The first voltage V1 is actually input to the V / F
converter, and then the first actual frequency F1 'is output to the MCU2. Step 3: The second
voltage V0 is actually input to the V / F converter 1, and the second actual frequency F0 'is
output to the MCU 2 again.
Step 4: After receiving the two real frequencies F1 'and F0', the MCU 2 compares both
frequencies with the standard frequencies F1 and F0. That is, it is determined whether (F1, F0) is
exactly the same as (F1 ', F0'). Procedure 5: If any frequency set is different (i.e. F1'F1 'or F0'F0'),
the frequencies F1 and F0 fall to K1 and K0. Step 6: In other words, after two coordinate points
(F1 ', K1) and (F0', K0) are generated in Cartesian coordinates, this frequency down transfer
function is then calculated from these two coordinate points. The figure of the frequency descent
correction transfer function, which is a linear function in Cartesian coordinates, is a straight line
passing through two such coordinate points. The frequency down correction transfer function is
then used by the MCU 2 to correct the linear deviation of the V / F converter during frequency
down conversion. Step 7: If F1 = F1 'and F0 = F0' in step 6 (S6), the initial standard frequency
descent transfer function is still valid, and there is no deviating transfer in the V / F converter.
Correction is unnecessary. See Figures 3-A and 3-B which show the transfer function diagram of
the invention in Cartesian coordinates. FIG. 3-A is an illustration of the V / F transfer function,
where the abscissa represents the input voltage (V) and the ordinate represents the output
frequency of the V / F converter. In FIG. 3A, two straight lines respectively represent the
standard V / F transfer function and the real V / F transfer function, and the straight lines of the
real V / F transfer function have coordinates (V1, F1 ′) and (V0, F0 ′) Are formed by
connecting two coordinate points A and B. FIG. 3B is an explanatory view of the standard
frequency descent transfer function and the frequency descent correction transfer function, both
are shown in Cartesian coordinates, the abscissa represents the output frequency of the V / F
converter 1 and the ordinate is the frequency of the MCU 2 Represents a falling output. In FIG.
3B, the straight line of the frequency descent correction transfer function is formed by
connecting two coordinate points C and D having coordinates (F1 ′, K1) and (F0 ′, K0 ′). The
above descriptions are only preferred embodiments according to the present invention, and are
not used to limit the scope of implementation. All equivalent variations and modifications made
by the appended claims are all covered by the claims of the invention.
[0005]
The manner in which the invention is considered novel is particularly pointed out in the
supplementary patent claims. However, the invention itself may be best understood with
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reference to the following detailed description of the invention describing exemplary
embodiments of the invention and the accompanying drawings as follows. FIG. 1 is a block
diagram of a device according to the invention. 5 is a flowchart of a deviation correction method
according to the present invention. FIG. 5 is a coordinate diagram of a transfer function
according to the invention. FIG. 5 is a coordinate diagram of a transfer function according to the
invention.
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