JPH02299497A - Inverter controller - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an inverter control device used to control a load (compressor) of an air conditioner, etc., and more specifically, it relates to an inverter control device used to control a load (compressor) of an air conditioner, etc. The present invention relates to an inverter control device for controlling an inverter.

[Conventional example] In recent years, this type of inverter control device has come to be used not only in air conditioners but also in various home appliances.Here, to explain using an air conditioner as an example, the inverter control device shown in Fig. 9 is used. In order to A memory section 3 stores various types of data (time data and switch data) according to the operating frequency, reads out predetermined waveform data from the memory according to the command of the operating frequency, and operates the plurality of switching elements based on this waveform data. Predetermined time O
It is provided with a control section 4 that performs N/OFF control, and a base drive section 5 that drives the plurality of transistors according to the control signal thereof.

Then, when the air conditioner outputs a command for a predetermined operating frequency according to the operation of the remote control, panel, etc., waveform data for 60 electrical degrees corresponding to the operating frequency command is read out from the memory unit 3. The energization pattern of the compressor is obtained based on these waveform data. At this time, as shown in FIG.

In the case of a time data storage control method, the waveform data includes data on the interval from the intersection of the sine wave 6 and the carrier 7 to the next intersection (time data), and data on the magnitude of the carrier 7 and the sine wave 6 during that time. (switch data). Therefore, time data and switch data corresponding to the operating frequency of the load are stored in advance in the memory.

In addition, the above time data and switch data are repeatedly read out from the memory, and the waveform data
The basic waveform pattern for 0 degrees is repeated to obtain a one-cycle pattern (approximate sine wave).

To explain in more detail, the power and
Turn on each transistor in transistor section 2.

A signal to turn off the transistors is output from the control section 4, and at this time, the timer section of the control section 4 obtains the time width for turning on and off these transistors based on time data.

Then, a drive signal for turning on and off these transistors for a predetermined period of time is input to the base drive section 5. Each transistor is 0N10FF in the base drive unit 5, and the voltage through these power transistors is three-phase (U phase, ■ phase,
Since these three-phase voltages (W-phase voltage) are applied to the compressor 1, the compressor 1 is driven at a predetermined operating frequency.

[Problems to be Solved by the Invention] By the way, in the above inverter control device, the electrical angle is 60 degrees (or 30 degrees) for all operating frequencies.
Since it is necessary to calculate the time data and switch data for each minute and store these data individually, the storage capacity of the memory section 3 becomes large.
In this case, a memory with a capacity of at least 22 bytes is required per cycle of the operating frequency. nevertheless,
The interval between operating frequencies is about 17 intervals at most, making it impossible to control the load very precisely.For example, when switching the operating frequency, there is a problem in that the step noise generated by the load becomes louder. Therefore, if an attempt is made to make the operating frequency interval smaller than 17, the memory capacity will become enormous.

This invention was made in view of the above-mentioned problems, and its purpose is to be able to more finely change the operating frequency interval of the load when controlling the load with an inverter, and to change the stage at which the load occurs when switching the operating frequency. An object of the present invention is to provide an inverter control device capable of suppressing noise.

[Means for Solving the Problems] In order to achieve the above object, an inverter control device of the present invention turns on a plurality of switching elements for a predetermined period of time based on time data and switch data stored in advance.
In an inverter control device that controls the operation of a load at a predetermined operating frequency by performing OFF control and continuously repeating control of a plurality of switching elements, the above time data is predetermined as fixed ON data and reference OFF data. a storage means for storing frequency data for storing predetermined combinations of electrical angles and processing the reference OFF data according to the operating frequency; processed,
The present invention is characterized in that it includes a control means for controlling ON and OFF of the plurality of switching elements based on time data based on the fixed ON data and the processed OFF data, and the switch data.

[Operation] With the above configuration, when the load is controlled by the inverter, the OFF data of the time data is processed based on the frequency data corresponding to the operating frequency command. This processed time data (ON.

Since a plurality of switch elements are driven based on the combination of OFF data) and the switch data, the load is controlled at the command frequency.

In this way, time data is obtained by combining the ON data and OFF data, and since the OFF data is processed according to the operating frequency command of the load, the frequency at which the OFF data is processed corresponds to the operating frequency. All you need to do is prepare the data, and there is no need to prepare time data for all frequencies. In other words, instead of preparing time data and switch data individually for each frequency, we prepare standard time data (a combination of ON and OFF data), frequency data for processing the standard OFF data, and switch data. All you have to do is store it in your memory.

Further, by setting various coefficients as the frequency data, it is possible to subtly process the OFF data, and for example, the operating frequency of the load can be changed in increments of 0.1&.

[Example] Hereinafter, an example of the present invention will be described based on the drawings. In addition, in FIG. 1, the same parts as in FIG. 9 are given the same reference numerals.
Omit duplicate explanations.

In Figure 1, the inverter control device has a fixed ON
Time data that combines data and standard OFF data for a predetermined electrical angle (for example, 60 degrees), and the standard OFF data
A memory section 8 stores frequency data and switch data for data processing, and reads out various data from the memory section 8 according to instructions from the air conditioner panel or remote controller, and also stores standard OFF data. The compressor 1 of the air conditioner is processed based on the switch data, their OFF data, and the ON data.
A control unit (CPU) 9 is provided.

As shown in FIG. 2, the ON data and OFF data (time data) are stored in the memory unit 8 for example, 60 degrees of electrical angle, in a combination where every two ON data become OFF data. There is. In addition, those ON
The data and OFF data are actual values when the number of carriers (frequency of carrier wave/frequency of modulated wave)=21. Further, the numbers of the ON data and OFF data correspond to the number of times a timer of the control unit 9, for example, a 42° timer, operates.

Further, as shown in FIG. 3, in one frequency data, various offset (V) values, cycle number (S) values, and minus number (N) are set according to the frequency of the compressor 1. The offset value is a number to be subtracted from the above OFF data, the cycle number (S) is the number of OFF data included in one cycle when the above OFF data string is divided, and the negative number (N) is the number of OFF data included in one cycle. This is the number of OFF data included in one cycle that is subtracted by 1.

Furthermore, as shown in FIG.
: hexadecimal) is the predetermined electrical angle (
For example, 60 degrees) are repeated to make 360 electrical degrees. In addition, as shown in FIG.
5”, V, U, and W become “1” and the other pits become “0”. This 6-bit control signal is input to the base drive unit 5, and these control signals are the same as those described above. It is held according to the time data.In other words, ON data “3 (15”) is held for switch data “15”.
261s)", but the switch data is "3 (126μs)" for the switch data "31".

OFF data “16” for switch data “38”
But... it goes like this.

Next, the operation of the inverter control device having the above configuration will be explained based on the flowchart shown in FIG.

First, assuming that the operating frequency command of the compressor 1 is 30.8H1, the control unit 9 sets the frequency data of the offset value (V) to "3", the number of cycles (S) to 5, and the minus number (N). 3 (shown in FIG. 3) is read from a predetermined area of the memory section 8 (step ST 1 ).
, the switch data "15 (H)" (shown in FIG. 4) is read and output (step 5T2), and the ON data (D) of the time data "3" (shown in FIG. 2) is read and output.
is read (step ST 3 ), and T1
The timer is activated (step Sτ4), and after the T□ timer operation ends, the above ON data (Dt) “3” is subtracted by 1 (step 5T5), and the operation of the above T1 timer continues until the ON data becomes 0. In this case, the operation of the timer (for example, 42 μs timer) is repeated three times, so the switch data “15 (H)” (010
101 (6 bits) is output to the base drive section 5.

In the base driving section 5, each transistor corresponding to "1" among the six bits is turned on, and each transistor corresponding to the other "O" is turned off.

Next, the primary switch data "31" (shown in FIG. 4) is read and output from the switch data area of the memory section 8 (step 5T7), and "" of the ON data (D) of the time data is read. 3'' (shown in FIG. 2) is read (step 5T8), and the T1 timer is activated (step 5T9), and after this T4 timer operation ends,
The ON data (Dr) “3” is subtracted by 1 (Step 5TIO), and the operation of the T-timer is repeated until the ON data becomes O (Step 5TII).
, in this case, the operation of the T1 timer is repeated three times in the same way as above, so 126. until .

The above switch data “31(H)” (6 of 110001
bit) is output to the base drive unit 5. In the base driving section 5, each transistor corresponding to "1" among the six bits is turned on, and each transistor corresponding to the other "O" is turned off.

Next, the third switch data “38 (H)” (fourth
(shown in the figure) is read and output (step 5T12
), and the standard OFF data (BT) of 1116” (
) is read (step 5T13),
Here, based on the frequency data read in step STI, it is determined whether the minus number (N) is O or not (step 5T14). In this case, since the minus number is not "0", The number of reference OFF data to be set to -1 is subtracted by 1 by the calculation process of N-1,
And, NT is set to 1 (step 5T15), and if the negative number is uO$1, NT
=O (step 5T16), and furthermore, the set NT (1) and the above OFF data (BT:16)
) and the frequency data offset value (3).
Processing of FF data is performed (step 5T17)
. In this case, the processed OFF data (D) is “1”
Then, the T□ timer is operated (step ST1g), and after the Ti timer operation is finished, the machining OFF data (D) "12" is subtracted by 1 (step ST1g). 5T19), the above T until the ON data becomes O.

The timer operation is repeated (step 5T20)
.

In this case, the operation of the T1 timer is repeated 15 times as described above, so 504. The switch data "38 (H)" (6 bits of 111000) is output to the base drive section 5 until the time period elapses. The base drive unit 5 turns each power transistor corresponding to “1” among the 6 bits into
Driving is performed to set the transistor to the FF state and to turn each power transistor corresponding to the other "ago" into the ON state.

Next, the arithmetic process of (S-1) is performed using the Sykes number (S) read in step STI above.
Step 5T21), if the result of this arithmetic processing is not 0, the process returns to step ST2 and the above steps are repeated (step 5T22). That is, as shown in FIG. , 31.
...”, and time data “3 (ON data), 3 (ON data), 12 (O
FF data), 2 (ON data), . The frequency data according to the frequency command is read, and the above steps are repeated.The fixed ON data and standard OFF data are the next data after the above step operation, and the electrical angle of 60 degrees is When the step operation is completed, the data returns to the initial data.Furthermore, the switch data becomes the data following the step operation described above, and when the electrical angle of 360 degrees is completed, the data returns to the initial data.

In this way, time data can be changed to ON data, ON data,
A combination of OFF data, ON data, ON data, OFF data, ON data, etc., and the ON
The data is fixed, and the standard OFF data is processed according to the operating frequency of the compressor 1. That is, as shown in FIG. 7, the ON data of the time data "3,3°・
..., 2, 3. ...,...'' is fixed, and the standard O
FF data “….

..., 16. ..., ..., 17. ...,...
” is processed based on the above frequency data and “...
..., 12. ..., ..., 13. ...,...'
When the switch data is output, the output holding time of the switch data is changed depending on the OFF data.

Furthermore, the reference OFF at the operating frequency of 30.8 Hz
To explain in detail the data processing, as shown in Fig. 8, the standard OFF data shown in Fig. 2 is repeated 6 times to make it 360 degrees, and the number of cycles (S) is
is 5 and the negative number (N) is 3, so in steps 5T14 and 5T15, three of the five standard OFF data are set to NT=1, and the other two data are set to NT=O. be done. Therefore, as shown in the figure, the OFF data is L116°17.17. ．． 1
7. ..." to "12, 13, 13, 14. ...”
It can be changed to different values like .

That is, by storing the frequency data (shown in FIG. 3) corresponding to the operating frequency in the memory section 3, it is not necessary to store the time data for all of the operating frequencies in the memory section 8.

As a result, the ON data is 14 bytes, and the standard OF
The F data is 7 bytes, the switch data is 126 bytes, and the frequency data is 3 bytes (for one frequency).For example, if you try to change the operating frequency from 07 to 100& in 0.17 intervals, the capacity will increase. Since the frequency data alone is 3 x 100Q bytes, the total storage capacity is 14 + 7 + 126 + 3 x 1000 = 3
147 bytes is sufficient, and in this way, the capacity of the memory section 8 does not need to be small, and the intervals between operating frequencies can be made extremely fine to 0.1 Hz intervals of 17 or less.
The operating frequency can be changed more smoothly, and the step noise generated by the compressor 1 at the time of the change can be suppressed.

Note that although the above embodiment describes the case where the number of carriers is 21, other cases can be dealt with in the same manner. Furthermore, it is possible to set various values for the offset value (V), number of cycles (S), and minus number (N) of the frequency data, and it is also possible to more delicately change the operating frequency of the load. .

[Effects of the Invention] As explained above, according to the inverter control device of the present invention, a plurality of switching elements (power transistors) are controlled based on time data and switch data in which loads are stored in advance.

In the inverter control device that controls the load at a predetermined frequency by continuously driving the switching element, the ON data and OFF data of the time data are stored in the memory for a predetermined electrical angle,
Further, frequency data for processing the OFF data is stored in accordance with the predetermined frequency, and the OFF data is processed based on the frequency data corresponding to the operating frequency command of the load.
Since the FF data is processed and the switching element is controlled by the time data and the switch data, which are a combination of the OFF data and the ON data, it is necessary to store the time data for all operating frequencies. , the memory capacity can be reduced,
Furthermore, since the OFF data can be changed subtly, the interval between operating frequencies can be made even finer, which has the effect of suppressing the step noise generated by the load when the operating frequency changes.

[Brief explanation of the drawing]

FIG. 1 shows an embodiment of the present invention, a schematic circuit block diagram of an air conditioner to which an inverter control device is applied, and FIGS. Data (ON, OFF data)
, a diagram for explaining the contents of the switch data and the output of the switch data, FIG. 6 is a flowchart diagram for explaining the operation of the inverter control device, and FIGS. 7 and 8 are diagrams for explaining the operation of the inverter control device. FIG. 9 is a schematic block diagram of a conventional inverter control device, and FIG. 10 is a diagram for explaining inverter control by the inverter control device of FIG. 9. In the figure, 1 is a compressor (load), 2 is a power transistor section (several switching elements), 5 is a base drive section, and 8
9 is a memory section, and 9 is a control section (cPυ). Patent applicant: Fujitsu General Co., Ltd. Agent: Patent attorney: Takuya Ohara Figure 1: 3. / Figure 4 Figure 5

Claims (1)

[Claims] (1) Multiple switching elements are turned on and off for a predetermined period of time according to pre-stored time data and switch data.
In an inverter control device that controls the operation of a load at a predetermined operating frequency by performing FF control and continuously repeating control of a plurality of switch elements, the time data is predetermined as fixed ON data and reference OFF data. Store a predetermined combination of electrical angles,
and storage means for storing frequency data for processing the reference OFF data according to the operating frequency; and processing the reference OFF data based on the frequency data. An inverter control device comprising: control means for controlling ON/OFF of the plurality of switching elements based on the switch data and time data based on the fixed ON data and the processed OFF data.