JPH03164095A - Inverter controller - Google Patents

Abstract

PURPOSE:To realize inverter control for general use by storing step data in a temporary memory means, when the operating frequency is modified, multiplying a voltage corresponding to a V/F pattern from a designating means by a basic wave data, setting a time data in an internal real timer, and subjecting the PWM waveform to the V/F pattern. CONSTITUTION:When a compressor 1 is subjected to inverter control, designating signal of a V/F pattern being fed from an input means 10c is read out. Read out of operating frequency data is then executed, data are read out from a second ROM 12b and data are further read out from the determined voltage data area in a third ROM 12c. Upon execution of reference timer processing, a PWM waveform for controlling the frequency of the compressor 1 is outputted according to the V/F pattern. A real time I/O port is then inverted according to set time data thus controlling the inverter according to the V/F pattern.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an inverter control device 111 used for controlling a debt (for example, a compressor such as an air conditioner), and more specifically relates to an inverter control device 111 used for controlling a debt (for example, a compressor such as an air conditioner). , V/I-”
This relates to a highly versatile inverter control device that can switch patterns at will.2 [Conventional example] In recent years, this type of inverter control device has been used not only for air conditioners but also for various home appliances. Became.

Here, to explain an air conditioner as an example, as shown in No. 15q, the inverter control device has a power unit consisting of a plurality of switching elements (transistors) that operate the compressor (load) 1. - A transistor section 2, a memory section 3 that stores various types of waveform data corresponding to the operating frequency of the compressor, such as time data and switch data for 60 degrees (or 30 degrees) of electrical angle, and a command for the operating frequency. Reads out predetermined waveform data from the memory unit 3 according to the A control unit (CPU; microcomputer) 4 that outputs a control signal for turning on and off the plurality of switching elements for a predetermined period of time based on this waveform data.
and a base opening section 5 that operates the plurality of transistors according to the control signal.

Then, when a command for a predetermined operating frequency is output in accordance with the operation of a remote control, panel, etc., waveform data for 60 electrical degrees corresponding to the operating frequency command is read out from the memory section 3, and these waveform data are Based on the P waveform of compressor 1 ((plus width modu-lait
ion; pulse signal) is obtained. At this time, as shown in FIG. 16, if the time data storage control method is used, the waveform data is sine waves 6, 7 of U phase, ■ phase, and V phase.
．． 8 and the carrier waveform 9 to the next intersection (time data), and data on the magnitude of the carrier waveform 9 and the sine wave 6 during that time (switch data). In this case, as shown in FIG. 17, for example, in section A, time data of 50 μs and "
001110" switch data is obtained, and in section B, 64 μs time data and "101010" switch data are obtained. Note that the switch data "X+yyZ" is the inversion of "u, v, w". Therefore, time data and switch data t corresponding to the operating frequency on the compressor are stored in the memory section 3 in advance.
Only tU, v, ytt are stored. These time data and switch data are repeatedly read out from the memory unit 3, and the basic waveform pattern (PWM waveform) for 60 degrees is repeated based on the waveform data.
A periodic pattern (approximate sine wave) is obtained.

To explain in more detail, first, the 1/O port (UtV+'+X+y,Z) of the control unit 4 outputs a signal "0 011 ].O" for a time of 50 μs.

Next, a signal of "101010" is output from the I/O ports (U, V.LX+Y, Z) for a period of 64 μs.

Similarly, the I/O port (U, LLX+y+2)
From 111+1110” according to time data
A signal that combines these is output. That is, pulse trains of the signals tlIJJ and IIQIP are output from the 1/0 boat, and these pulse trains are input to the base control unit 5. Then, each transistor of the power transistor section 2 is driven by the base drive section 5, and a pulse-like voltage waveform corresponding to the output (U, VtV) of the I/O boat is applied to the compressor 1. . Due to these pulsed voltages, U-V, V-w, w-U interphase voltage waveforms are applied to the compressor 1, so an approximate sine wave current flows through the compressor 1. The motor is activated.

[Problems to be Solved by the Invention] By the way, the capacity of the air conditioners described in "2" differs depending on the model, for example, 2500 kcal. 2800k
Since different compressors 1 such as Cal are used, it is necessary to change the V/F pattern of the inverter control according to these compressors 1.

However, in the case of the above-mentioned inverter control 'A tF1, it is necessary to prepare data to obtain the PWM waveform, that is, time data and switch data for 60 degrees of electrical angle for each operating frequency, and the memory capacity is unavoidable. becomes large, and Pl7M according to different V/I・゛ patterns
When trying to use waveform data, the memory capacity is 1.
1 becomes huge. Therefore, one inverter control device usually has one ■/F pattern PW.
It was only able to store M waveform data and lacked versatility.

This invention was made in view of the above problems, and its purpose is to provide a versatile inverter control device 1a that can output PwM waveforms of different V/F patterns without increasing memory capacity. There is a particular thing.

[Means for Solving the Problems] In order to achieve two objectives, the present invention reads out waveform data corresponding to the target frequency of the load from a memory, and reads out waveform data corresponding to the target frequency of the load when controlling the inverter of the load. Obtain a PWM waveform based on the data, and use this PVM waveform to turn the switching transistor ON / OFF F'
In the inverter control device that outputs the voltage waveform to be applied to the load, the electrical angle of the sine wave is divided into equal parts of 60 degrees, 120 degrees, or 180 degrees, and the peak value of the sine wave at this equal division position is calculated. an upper memory for storing fundamental wave data; a second memory for storing step data for reading out the fundamental wave data corresponding to the operating frequency of the Kamikita load; voltage! A third memory stores a plurality of types of voltage data for each different V/F pattern, and a carrier wave of a constant frequency is superimposed on the above-mentioned positive wave, and the above-mentioned fundamental wave is generated from the peak or trough of this carrier wave. a fourth memory that stores the interval to the position of the carrier wave corresponding to the data as time data; a temporary storage means that stores the step data of the second memory according to the operating frequency of the load; and the plurality of types of data. An instruction means for instructing one of the "V/F" patterns of At the same time as reading out the wave data, reading out the voltage data according to the V/F pattern by the indication means,
control means for multiplying the voltage data by the read fundamental wave data and setting the time data corresponding to the calculated value in an internal real timer every half period of the carrier wave; The gist is that the output of the real-time I/O boat is inverted in accordance with the setting {m of the internal real timer, and the PWM waveform is made to follow the instructed V/F pattern.

[Function] Since the above configuration is adopted, when the predetermined V/1·゛ pattern is outputted by the above-mentioned instruction means, reading out the voltage data of the third memory is started when obtaining the time data to be set in the above-mentioned real timer. The address is determined according to the designated V/F pattern.

Then, based on the data in the first to third memories, arithmetic processing is performed to read out time data in the fourth memory, and the time data read out as a result of this calculation is set in the real timer. With this set, the real timer I/O boat is inverted and this output is P
It is made into a WM waveform and is made to follow the above-mentioned instructed V/F pattern.

In this way, when controlling the load with an inverter, by storing voltage data in the third memory according to different V/F patterns. The V/F pattern can be switched arbitrarily, and there is no need to increase the memory capacity so much.

[Example] Hereinafter, an example of the present invention will be described based on FIGS. 1 to 14. Note that in FIG. 1, the same parts as in FIG. 15 are given the same reference numerals, and redundant explanation will be omitted.

In FIGS. 1 to 8, the inverter control device includes:
A control unit with a real timer and its 1/0 port (
CPtj) 10a is provided, and further divides the electrical angle of 60 degrees, 120 degrees, or 180 degrees of the predetermined sine wave l1 into equal parts (for example, the 60 degrees of electrical angle of the sine wave is divided into 256 equal parts), and this equal division is performed. A first ROM (memory) 12a stores the height value of the sine wave l1 obtained at the position as fundamental wave data (shown in FIG. 3), and the fundamental wave data is stored in accordance with the operating frequency of the load. A second ROM (memory) 12b stores step data (shown in FIG. 4) for reading out the step data, and voltage data (shown in FIG. 5) to be multiplied by the fundamental wave data read out by the step data is stored in various voltages. / 3rd Iku○M that stores multiple numbers for each F pattern
(Memory) 12c, a carrier wave 13 of a constant frequency is superimposed on the sine wave l1, and the interval from the peak or trough of the carrier wave 13 to the height value of the sine wave 11 obtained by the above-mentioned equal division is calculated. Time data I, n (shown in Figure 8)
A fourth ROM (memory) 12 having a fourth ROM (memory H2d) is provided.The control unit 10a also stores a certain number of second An internal memory (temporary storage means) tab that stores step data, an input means 10c that inputs an instruction signal of a predetermined V/F pattern, reads the step data of the internal memory 10b, and reads the step data based on this step data. The above fundamental wave data is read out, this fundamental wave data is multiplied by the above voltage data, and the above time data corresponding to this calculated value is stored for a certain period of time, for example, the time of half the period of the above carrier wave (PW
It has a function to set the real timer at each time (M timer time). Note that the control unit 1 (la and RO
A microcomputer 10 is constructed by M12 and the like.

In addition, as shown in Fig. 9, a serial signal between the indoor unit and outdoor unit of the air conditioner is used as the V/F pattern instruction signal, for example, when the air conditioner is turned on. When the signal is sent from the indoor unit, it is added to the beginning of the signal sent from the indoor unit, inputted to the microcomputer 10, and the microcomputer 10 decodes the signal.

Furthermore, as shown in FIG. 10, the I/O board of the microcomputer 10 is used as an input means, and the voltage drop across the resistor 14 is obtained by using a jumper wire indicated by a broken line in the figure as an instruction means. As 4-bit data,
This data may be input as an instruction signal of a predetermined V/F pattern.

Furthermore, as shown in FIG. 11, the A/D conversion input port of the microcomputer 10 is used as an input means, the voltage drop of the variable resistor 15 is obtained as an indicating means, and the analog The voltage value may be input as an instruction signal of a predetermined V/F pattern.

Note that in FIGS. 2 and 3, the fundamental wave data is an average value in equal division, but it may be a value at one end of the equal division.

In addition, the fundamental wave data is such that the peak value H of the sine wave l1 is 25
6, and the carrier frequency fc is 3. 3 k l{z
This is the value when the control rate is set to 2.

Here, the data stored in the first to fourth ROMs 12a, 12b, 12c, and 12d will be explained with reference to FIGS. 2 to 8.

First, as shown in Figure 2, the peak value (I1 = 256
) is divided into 256 equal parts, and the height (1-1 a) of the sine wave l1 in this equal division is H a
= 255 sin O, and the value obtained by dividing this calculation/1z is used as the fundamental wave data. Also, in the same manner as above, divide the sine wave 11 into 256 equal parts at 60 degrees to 120 degrees and 120 degrees to 180 degrees, calculate the height of the sine wave l1 in these equal divisions, and calculate the calculated value. is the fundamental wave data (shown in Figure 3). Further, as shown in FIG. 4, the step data becomes larger as the operating frequency of the load becomes higher. When the compressor 1 is controlled at the operating frequency, the reference wave data is sequentially read out using a fixed number (for example, 20) of step data stored in the internal memory 1 (lb).

Furthermore, as shown in FIG. 5, the voltage data has the function of adjusting the voltage of the output waveform, and is multiplied by the fundamental wave data read above to obtain time data I, H, which will be described later.
is obtained. Furthermore, although data for one V/F pattern is shown in FIG. 5, such data is prepared for each V/I/pattern, and the third RO
It is stored in Ml2c.

Furthermore, as shown in FIGS. 6 to 8, the interval (time;
Tai) is time data ■, and carrier g with positive slope
The interval (time; 'f''bi) from the trough of t3b to the intersection αb between the carrier wave 13b and the overtopping wave data is time data ■.The fourth ROM 12d has -
The calculated value i is stored in correspondence with the time data I and H (as shown in FIG. 6).

Next, the operation of the above inverter control device is shown in FIG.
The explanation will be made based on the flowchart 1 shown in FIG. 3 and the evening chart shown in FIG. 14.

First, when the compressor 1 is controlled by the inverter, a V/F pattern instruction signal input from the input means 10c is read by the inverter control device (step STI). At this time, the instruction signal from the outside is information for selecting a v/F pattern suitable for the compressor l. and,
The input instruction signal is decoded, and the third
The start address of the voltage data area corresponding to the instruction V/I'' pattern in the ROM 12c is determined (step ST2). Next, reading of the operating frequency (P'o) data is executed (step ST3). For example, data for 16 cells (R2; step data shown in the fourth figure) is read out from the second ROM 12b (step ST4), and data (R3) in the voltage data area determined above is read out from the third ROM 12c. is read out (step ST5).At this time, V according to the external instruction is read out (step ST5).
/F' pattern corresponds to that shown in FIG. 5, 1118 IT will be read from the third ROM 12c.

Subsequently, reference timer start processing is executed (step ST6). In this process, an interrupt is generated every half period (for example, 150 μs) of the carrier wave 13, and according to the V/F pattern described above, the compression Ili! A PWM waveform with a frequency of 16 Hz is output. This is the first
To explain in detail based on the routine in Figure 3, first the timer is started (step STII), time data (R4; data shown in Figure 8) is set (step ST12), and then the real timer is set. The time data calculation process is executed (step S
Tl3). In this process, the next step data R
2 (R2+step value) is performed, and based on the data resulting from this calculation, fundamental wave data (R1; data shown in FIG. 3) is read 11) from the first ROM. Then, the calculation Acc=RIXR3/correction value is performed, and time data (R4; data shown in FIG. 8) of the fourth ROM 12d is obtained based on the calculation result. That is, as shown in FIG.
3 II 11 3 I+“3”... then R
2 becomes “2 ++, 11 by (R2) + (step value)
5"II g I1,..., and the fundamental wave data of these addresses are "3", "6 pp, r'9",...
- (in the case of 60 electrical degrees) is read out. moreover,
These fundamental wave data and voltage data are sequentially multiplied, but when the maximum control rate of the compressor ↓ is 2, in order to obtain a control rate with an accuracy of 0.01, the voltage data is multiplied by 100 times, that is, the voltage data “200
”, the fundamental wave data (Rl) When data is obtained and, for example, the previous time data is time data I, time data ■ corresponding to the same calculated value is read from the first ROM 12d, and these time data correspond to, for example, 20 step data. Then, real timer I/O output processing is executed (step ST7).In this output processing, as shown in FIG. When the time corresponding to the time data is measured by the above timer, the time data real timer i
The output of /O is inverted. If there is no change in the operating frequency (■·゛0) (step ST8), the routine shown in FIG. 13 is repeatedly executed every half period of the carrier wave 13. Therefore, internal memory 1
The time data obtained based on the step data of 0b (fixed number: for example, 20 pieces) is stored in j. ROM 1 of 4
This time data is read from 2d and is set to a real timer, which inverts and controls the real timer I/O baud1. With this reversal control, the real timer 1/0 boat switches the compressor 1 to the above 1.
6[1z will output a P waveform controlled by the inverter. Moreover, when controlling the inverter at the operating frequency of 1611z, the V/F pattern is set in accordance with the initial instruction.

On the other hand, if the operating frequency (1'o) is changed to step ST8), for example, (1.'' = 17Hz), the new frequency (17}1z)
The step data for is read from the second ROM 12b and temporarily written to the internal memory 1ob. Furthermore, the voltage data for that 171fz is the third R O
It is read from the voltage data area corresponding to the above indicated V/F' pattern of M12c. The routine shown in FIG. 13 is then executed when an interrupt occurs every half cycle of the carrier. Then, as shown in FIG. 14, the same process as above is executed, and as a result of this process, time data ■ or II is read out from the fourth ROM l2a and set in the real timer, and then the next time data Processing to obtain data (1) or (2) is performed. As a result, the real-time I/O boat is inverted controlled according to its set time data I or
A dM waveform is obtained. Moreover, its operating frequency is 17+1
When controlling the z inverter, the V/F pattern is set in accordance with the initial instruction.

The real-time I/O boat outputs U-phase, ■-phase, and V-phase PWM waveforms, as well as their inverted X-phase, y-phase, and Z-phase QM waveforms, and pulse trains of these PIIM waveforms. is input to the base percussion section 5. Then, each transistor of the power transistor section 2 is activated by the base opening section 5, and a pulse-like voltage waveform corresponding to the above-mentioned PWM waveform is applied to the compressor 1. V, v-v, w-u interphase voltage waveforms are applied, and an approximate positive wave flow flows through the compressor 1, causing the motor on the compressor to move.

In addition, when controlling the inverter of the compressor 1, the compressor l
When the V/F pattern of the V/F pattern is different, an instruction for the different V/F pattern is input from the outside, and this external instruction is decoded in the same manner as in Section 2.
A start address of a predetermined voltage data area provided in M 12 c is determined. In this way, the third ROM1
By storing voltage data corresponding to various V/l-゛ patterns in 2c, the V of inverter control can be adjusted.
/T=' pattern can be switched, and a versatile inverter control device can be obtained.

moreover. The ROM 12 contains fundamental wave data based on a predetermined sine wave 11, a carrier wave 13 with a constant frequency, time data I or ■ based on the fundamental wave data, and information for obtaining the time data I and ■ corresponding to the operating frequency. Step data (reading interval data of fundamental wave data) and voltage data are stored, and the voltage data is also stored in multiple different V/l = "patterns, but the memory capacity is much larger than in the past. It may be less than that.

[Effects of the Invention] As explained above, the inverter control system of the present invention is as follows.
According to 1, a predetermined normal wave is divided into equal parts, the fundamental wave data at this equal division, and the sine wave are combined with a carrier wave of one frequency, and the above fundamental wave data is obtained from the peaks or troughs of this carrier wave. According to the time data to the carrier wave position corresponding to the position and the operating frequency of the debt (pressure fI machine).
In order to read the two fundamental wave data, a predetermined number of step data for each frequency 4j, for the above operating frequency, and
Equipped with voltage data according to various V/I patterns,
When controlling the inverter, the Hiromoto wave data corresponding to the above step data and the instructed V/I "pattern" tonic pressure data are processed, and the time data corresponding to the calculated values obtained as a result is processed in real time. Since the output waveform of the real-time I/O boat is set as a PWM waveform,
The memory capacity of the data to obtain the PQM waveform is small, and even if the load is different, the voltage can be adjusted according to the situation.
Since the inverter can be controlled using the /l/' pattern, the general-purpose space of the inverter control device IY can be reduced, and the data memory capacity only needs to be slightly increased. be.

[Brief explanation of the drawing]

FIG. 1 is a schematic block diagram of an inverter control device showing one embodiment of the present invention, and FIGS. 2, 6, and 7 explain the output of data used in the above-mentioned inverter control device. Figures 3, 4, 5 and 8 for
The figure shows R used in the -1 Fuhi inverter control system ii'f.
Diagram for explaining the contents of OM, Figure 9 No. 1ヱ1
1 is a diagram for explaining another embodiment of the V/F pattern instruction in the inverter control device of the present invention, and FIGS. 12 and 13 are flowchart diagrams for explaining the inverter control device, and FIG. 14 is a time chart diagram for explaining the inverter control device described above, and FIG. 15 is a schematic block diagram of a conventional inverter control device.
FIG. 6 is a diagram for explaining a method of storing data used in a conventional inverter control device, and FIG. 17 is a diagram for explaining the contents of a ROM used in a conventional inverter control device. In the figure, { is the compressor (load), 2 is the power transistor section (several switching elements), 5 is the base moving section, 1
0 is a microcomputer, 10a is a control unit (CPU)
, 10b is an internal memory (temporary storage means), 10C is an input means (for v/F pattern instruction signal), l1 is a sine wave, 1
2 is ROM, 12a is the first ROM (for fundamental wave data), 12b is the second r<OM (for step data), 12c is the third ROM (for voltage data), l2d
is the fourth ROM (for time data), 13, 13a,
13b is a carrier waveform, 14 is a resistor, and 15 is a variable resistor.

Claims (4)

[Claims] (1) When controlling a load with an inverter, read waveform data corresponding to the target frequency of the load from memory, obtain a PWM waveform based on the waveform data, and obtain the PWM waveform based on the waveform data.
Switching transistors are turned ON/OFF depending on the waveform.
In an inverter control device that outputs a voltage waveform to be applied to the load, the electrical angle of the sine wave is divided into equal parts of 60 degrees, 120 degrees, or 180 degrees, and the peak value of the sine wave at the equal division position is calculated. A first memory (ROM) that stores fundamental wave data; and a second memory (ROM) that stores step data for reading out the fundamental wave data in accordance with the operating frequency of the load.
), a third memory (ROM) that stores a plurality of types of voltage data for each different V/F pattern to adjust the voltage of the output waveform by multiplying the fundamental wave data; a fourth memory (ROM) for superimposing a carrier wave on the carrier wave and storing an interval from the peak or trough of the carrier wave to the position of the carrier wave corresponding to the fundamental wave data as time data; temporary storage means for storing the step data of the second memory in accordance with the above; and instruction means for instructing one of the plurality of types of V/F patterns; upon changing the operating frequency, reading the step data and The fundamental wave data is stored in a temporary storage means, and the fundamental wave data is read out based on the stored step data, and the voltage data according to the V/F pattern by the instruction means is read out, and the voltage data and the read fundamental wave data are combined. and a control means for setting the time data corresponding to the calculated value in an internal real timer every half period of the carrier wave, according to the set value of the internal real timer. An inverter control device characterized in that an output of a real-time I/O port is inverted controlled so that the PWM waveform follows the instructed V/F pattern. (2) The inverter control device according to claim 1, wherein the instruction means is a serial signal sent and received between the indoor unit and the outdoor unit of the air conditioner. (3) The inverter control device according to claim (1), wherein the control means is a microcomputer having an input/output port, and the instruction means inputs a multi-bit signal to the input port. (4) The control means is a microcomputer having an A/D conversion input port, and the instruction means is a microcomputer having an A/D conversion input port, and the instruction means is a microcomputer having an A/D conversion input port.
The inverter control device according to claim 1, wherein a predetermined analog signal is input to the conversion input port.