JP4539279B2 - Inverter system, inverter device and frequency setting method thereof - Google Patents

Description

  The present invention relates to an inverter system and an inverter device that generate an inverter output that drives an AC load from an AC power source, and more particularly, an inverter system that generates an inverter output whose set frequency can be automatically set in response to a time division proportional pulse from the outside. And an inverter device.

  2. Description of the Related Art Conventional inverter devices are known in which a frequency of an inverter is set with a volume (knob) or the like and a set frequency is determined with a confirmation button.

  For example, “Patent Document 1” (inverter device) is provided with a rotary pulse generator knob and an indicator as an operation parameter setting device, and a plurality of parameters can be selected and data can be set by rotating the knob. What has been made is disclosed.

Thereby, the operation for selecting the operation parameters and data of the inverter device, which is complicated, can be performed by rotating the knob, and for example, fine adjustment of the set frequency can be easily performed.
Japanese Patent Laid-Open No. 9-247948

  Since conventional inverter devices including “Patent Document 1” can easily set the frequency of the inverter output simply by rotating the knob while looking at the display, the inverter is operated at a constant frequency for a predetermined time. It is suitable for the case, but it is necessary to change the inverter output frequency within a predetermined time to operate the load.For example, when starting operation, set the inverter output frequency low and gradually increase the frequency. Thus, there is a problem that it is impossible to respond to a request for setting the frequency to a predetermined frequency and gradually decreasing the frequency from the predetermined frequency at the end of the operation by manual operation of rotating the knob.

  The present invention has been made to solve such a problem, and an object thereof is to automatically determine the set frequency of the inverter output corresponding to the time-division proportional pulse and to change the inverter system with high convenience and to be changed. It is to provide an inverter device.

In order to solve the above problems, an inverter system according to the present invention is based on an AC power supply of commercial frequency, an external device that outputs a time-division proportional pulse, an AC output from the AC power supply, and a time-division proportional pulse from the external device. An inverter system comprising an inverter device that generates an inverter output of variable frequency and a load, and the inverter device calculates a duty from a time-division proportional pulse and calculates a set frequency at a frequency corresponding to the duty. The frequency calculation means measures the on-time and off-time of the time-division proportional pulse, and the duty calculation means calculates the duty from the on-time and off-time timed by the time measuring means. A deviation calculating means for calculating a deviation frequency between an upper limit value and a lower limit value of a preset set frequency; Multiplying means for multiplying the duty from the calculating means by the deviation frequency from the deviation calculating means, adding means for adding the multiplication result of the multiplying means and the set frequency lower limit value, on time, off time, duty, set frequency upper limit value In addition to storing the set frequency lower limit value, the deviation frequency, and the multiplication result, storage means for storing a sequence operation program and control means for controlling the sequence operation are provided .

  Since the inverter device of the inverter system according to the present invention includes the frequency calculation means for calculating the duty from the time-division proportional pulse and calculating the set frequency at a frequency corresponding to the duty, the operation pattern required for the load is automatically It is possible to generate an inverter output having a preset frequency.

Further, the time measuring means for measuring the on-time and the off-time of the time-division proportional pulse according to the present invention, the duty calculating means for calculating the duty from the on-time and the off-time timed by the time measuring means, and a preset set frequency Deviation calculation means for calculating the deviation frequency between the upper limit value and the lower limit value, multiplication means for multiplying the duty from the duty calculation means and the deviation frequency from the deviation calculation means, and the multiplication result of the multiplication means and the set frequency lower limit value are added. Addition means, on-time, off-time, duty, set frequency upper limit value, set frequency lower limit value, deviation frequency, multiplication result, storage means for storing a sequence operation program, and control means for controlling the sequence operation The inverter output frequency pattern is automatically set according to the time-division proportional pulse pattern. It is possible.

  Furthermore, the external device according to the present invention is a temperature controller that outputs a time-division proportional pulse.

  An external device according to the present invention is a PLC (programmable controller) that outputs a time-division proportional pulse.

  Since the external device according to the present invention is a temperature controller and PLC (programmable controller) that outputs time-division proportional pulses, any pulse or pulse train can be output.

  Furthermore, the inverter system according to the present invention is characterized in that the external device is constituted by a temperature controller, the load is constituted by a motor, and the inverter device and the motor are applied as actuators of the temperature regulator.

  In the inverter system according to the present invention, the external device is composed of a temperature controller, the load is composed of a motor, and the inverter device and the motor are applied as actuators of the temperature controller. , Concentration) is detected by a sensor, and the inverter adjusts the time-division proportional pulse by supplying a time-division proportional pulse corresponding to the difference between the target control amount and the detected control amount to the inverter device. The control amount (for example, flow rate and concentration) of the target device can be adjusted to the target control amount by rotating the motor with the inverter output of the frequency.

The inverter device according to the present invention is an inverter device that generates an inverter output of a variable frequency based on a time division proportional pulse, calculates a duty from the time division proportional pulse, and sets a set frequency at a frequency corresponding to the duty. It comprises frequency calculation means for calculating , and the frequency calculation means measures the on-time and off-time of the time-division proportional pulse, and calculates the duty from the on-time and off-time timed by the time counting means. Duty calculating means, deviation calculating means for calculating a deviation frequency between an upper limit value and a lower limit value of a preset set frequency, multiplying means for multiplying the duty from the duty calculating means and the deviation frequency from the deviation calculating means, , Addition means for adding the multiplication result of the multiplication means and the set frequency lower limit value, on time, off time, duty Set frequency limit, set the frequency lower limit, the deviation frequency, stores the multiplication result, storage means for storing a program sequence operation, and control means for controlling the sequence operation, characterized in that it comprises a.

  An inverter device according to the present invention is an inverter device that generates an inverter output of a variable frequency based on a time division proportional pulse, calculates a duty from the time division proportional pulse, and calculates a set frequency at a frequency corresponding to the duty. Since the frequency calculation means is provided, it is possible to generate an inverter output having an automatically set frequency with an operation pattern required for the load.

Further, the frequency calculation means according to the present invention includes a time measuring means for measuring the on-time and off-time of the time-division proportional pulse, a duty calculating means for calculating a duty from the on-time and off-time timed by the time measuring means, and presetting Deviation calculating means for calculating the deviation frequency of the set upper limit value and lower limit value of the set frequency, multiplying means for multiplying the duty from the duty calculating means by the deviation frequency from the deviation calculating means, the multiplication result of the multiplying means and the set frequency Addition means for adding a lower limit value, on-time, off-time, duty, set frequency upper limit value, set frequency lower limit value, deviation frequency, multiplication result, storage means for storing a sequence operation program, and sequence operation Control means for controlling the frequency of the inverter output automatically according to the time-division proportional pulse pattern. It is possible to set the pattern.

  A frequency setting method for an inverter device according to the present invention is a frequency setting method for an inverter device for setting a frequency of an inverter output corresponding to a time division proportional pulse, the step of taking a time division proportional pulse, an on time, A step of measuring an off time, a step of calculating a duty from an on time and an off time of a time division proportional pulse, a step of calculating a deviation frequency of a set upper limit frequency and a set lower limit frequency, and a step of multiplying the deviation frequency and the duty And a step of determining the set frequency by adding the set lower limit frequency to the multiplication result.

  The frequency setting method of the inverter device according to the present invention includes a step of taking a time division proportional pulse, a step of measuring an on time and an off time, a step of calculating a duty from the on time and the off time of the time division proportional pulse, Since it has a step of calculating the deviation frequency of the set upper limit frequency and the set lower limit frequency, a step of multiplying the deviation frequency and the duty, and a step of determining the set frequency by adding the set lower limit frequency to the multiplication result. The frequency pattern of the inverter output can be automatically set according to the proportional pulse pattern.

  Since the inverter device of the inverter system according to the present invention includes the frequency calculation means for calculating the duty from the time-division proportional pulse and calculating the set frequency at a frequency corresponding to the duty, the operation pattern required for the load is automatically Therefore, it is possible to generate an inverter output having a frequency set automatically, and to improve convenience.

  Further, the frequency calculation means according to the present invention includes a time measuring means for measuring the on-time and off-time of the time-division proportional pulse, a duty calculating means for calculating a duty from the on-time and off-time timed by the time measuring means, and presetting Deviation calculating means for calculating the deviation frequency of the set upper limit value and lower limit value of the set frequency, multiplying means for multiplying the duty from the duty calculating means by the deviation frequency from the deviation calculating means, the multiplication result of the multiplying means and the set frequency Addition means for adding a lower limit value, on-time, off-time, duty, set frequency upper limit value, set frequency lower limit value, deviation frequency, multiplication result, storage means for storing a sequence operation program, and sequence operation Control means for controlling the frequency of the inverter output automatically according to the time-division proportional pulse pattern. Can set the pattern, it is possible to generate an inverter output of any frequency pattern required for the load.

  Furthermore, since the external device according to the present invention is a temperature controller or PLC (programmable controller) that outputs time-division proportional pulses, any pulse or pulse train can be output, and an inverter output of any frequency pattern can be output. Can be generated.

  Further, in the inverter system according to the present invention, the external device is configured with a temperature controller, the load is configured with a motor, and the inverter device and the motor are applied as actuators of the temperature controller. , Flow rate, concentration) is detected by a sensor, and the inverter adjusts the time division proportional pulse by supplying the time division proportional pulse according to the difference between the target control amount and the detected control amount to the inverter device. The control amount (for example, flow rate and concentration) of the target device can be adjusted to the target control amount by rotating the motor with the inverter output voltage at the set frequency, and the control amount of the target device is automatically controlled for convenience. Improvements can be realized.

  Furthermore, an inverter device according to the present invention is an inverter device that generates an inverter output of a variable frequency based on a time division proportional pulse, calculates a duty from the time division proportional pulse, and sets a set frequency at a frequency corresponding to the duty. Since the frequency calculating means for calculating is provided, an inverter output having an automatically set frequency can be generated with an operation pattern required for the load, and convenience can be improved.

  Further, the frequency calculation means according to the present invention according to the present invention includes time measuring means for measuring the on-time and off-time of the time-division proportional pulse, and duty calculating means for calculating the duty from the on-time and off-time timed by the time measuring means. Deviation calculating means for calculating a deviation frequency between a preset upper limit value and a lower limit value of the set frequency, a multiplying means for multiplying the duty from the duty calculating means by the deviation frequency from the deviation calculating means, and multiplication by the multiplying means An adding means for adding the result and the set frequency lower limit value, and a storage means for storing the on-time, the off time, the duty, the set frequency upper limit value, the set frequency lower limit value, the deviation frequency, the multiplication result, and the sequence operation program And a control means for controlling the sequence operation, it is automatically inverted according to the time division proportional pulse pattern. Can set a frequency pattern of the data output, it is possible to generate an inverter output of any frequency pattern required for the load.

  Furthermore, the frequency setting method of the inverter device according to the present invention includes a step of taking a time division proportional pulse, a step of measuring an on time and an off time, and a step of calculating a duty from the on time and the off time of the time division proportional pulse. And a step of calculating a deviation frequency between the set upper limit frequency and the set lower limit frequency, a step of multiplying the deviation frequency and the duty, and a step of determining the set frequency by adding the set lower limit frequency to the multiplication result. The frequency pattern of the inverter output can be automatically set according to the pattern of the time division proportional pulse, and the convenience can be improved.

  Embodiments of the present invention will be described below with reference to the accompanying drawings. In the present invention, the set frequency is automatically calculated in response to the time division proportional pulse, and the inverter output of the calculated set frequency is generated.

  FIG. 1 is a system block diagram showing an inverter system according to an embodiment of the present invention. In FIG. 1, an inverter system 1 is constructed from an AC power source 2, an external device 3 that supplies a time division proportional pulse PTD to an inverter device 4, an inverter device 4 that generates an inverter output voltage VIV, and a load 5. The load 5 is operated (driven) with the inverter output voltage VIV having the set frequency fS.

  The AC power supply 2 supplies three-phase AC power (AC voltage VAC) of 50 Hz or 60 Hz to the inverter device 4.

  The external device 3 includes a temperature controller, a PLC (programmable controller), and the like, and provides the time-division proportional pulse PTD to the inverter device 4. The temperature controller detects the control amount (for example, flow rate and concentration) of the target device to be controlled, and outputs the time-division proportional pulse PTD so that the control amount (for example, flow rate and concentration) of the target device is appropriate. To do.

  FIG. 3A is an example waveform diagram of a time division proportional pulse, and FIG. 3-B is another example waveform diagram of the time division proportional pulse. In FIG. 3A, the time-division proportional pulse represents a pulse train having a period of 1 second, for example, and the pulse ON time is 0.2 seconds and the pulse OFF time is 0.8 seconds. 0.2 / (0.2 + 0.8) = 0.2.

  On the other hand, in FIG. 3B, the time-division proportional pulse represents a pulse train having a period of 1 second, for example, and the pulse on time is 0.7 seconds and the pulse off time is 0.3 seconds. 0.7 / (0.7 + 0.3) = 0.7.

  By changing the ON time of the time division proportional pulse PTD, the duty can be changed.

  The inverter device 4 includes a rectifier circuit 6, a smoothing capacitor C, a bridge circuit 7, a frequency calculation means 8, a bridge drive circuit 9, a display means 10, and an input means 11, and a three-phase AC voltage VAC supplied from the AC power supply 2. Is rectified by a rectifier circuit 6 to be pulsated, and then smoothed by a smoothing capacitor C to generate a DC voltage VDC, and a PWM signal supplied from a bridge drive circuit 9 to a switching element constituting a three-phase bridge circuit 7 PWM (Pulse Width Modulation) is driven by the SPW to generate a three-phase inverter output voltage VIV from the DC voltage VDC at the set frequency fS, and the load 5 is driven by the inverter output voltage VIV.

  The bridge drive circuit 9 is composed of a PWM drive circuit or the like, and supplies the PWM signal SPW to the bridge circuit 7 based on the set frequency fS provided from the frequency calculation means 8, whereby the inverter of the set frequency fS is supplied from the bridge circuit 7. An output voltage VIV is generated.

  The frequency calculation means 8 calculates the duty based on the time division proportional pulse PTD supplied from the external device 3 such as a temperature controller, calculates the set frequency fS at a frequency corresponding to the duty, and sets the set frequency fS to the bridge drive circuit. 9 to provide.

  Therefore, the duty can be changed by changing the ON time of the time division proportional pulse PTD shown in FIGS. 3A and 3B, and the frequency corresponding to the duty (set frequency fS) is automatically set. And it can be set freely.

  The input means 11 is constituted by a key switch or the like, and inputs the set upper limit frequency fMX and the set lower limit frequency fMN of the set frequency f S and stores them in the frequency calculation means 8. The set upper limit frequency fMX and the set lower limit frequency fMN need to be set for each operation of the system as long as the initial setting is made as long as the set frequency fS is within the range between the set upper limit frequency fMX and the set lower limit frequency fMN. There is no.

  The display means 10 is constituted by a display such as an LCD (liquid crystal display), and the calculation upper limit frequency fMX at the time of initial setting, the setting lower limit frequency fMN, the calculation progress when calculating the setting frequency fS from the time division proportional pulse PTD, Inverter output voltage VIV, set frequency fS, etc. are displayed.

  The load 5 is composed of, for example, a motor, is driven by a three-phase inverter output voltage VIV supplied from the inverter device 4, and drives a target device to be controlled by the driving torque of the motor. When driving the motor, if the set frequency fS of the inverter output voltage VIV is increased, the motor speed is increased (or the drive torque is increased), and if the set frequency fS is decreased, the motor speed is decreased ( Or, the driving torque is reduced).

  The inverter device 4 and the motor configure the actuator of the temperature controller that constitutes the external device 3, thereby driving and controlling the target device to be controlled, and appropriately controlling the control amount (for example, flow rate and concentration) of the target device. Can be kept in.

  In the present embodiment, the AC power supply 2 is described as a three-phase AC and the inverter output is also a three-phase AC. However, the AC power supply 2 is a two-phase, the inverter output is a three-phase AC, or the AC power supply 2 is a three-phase. The inverter output may be a two-phase alternating current.

  As described above, the inverter device 4 according to the present invention includes the frequency calculation means 8 that calculates the duty from the time-division proportional pulse PTD and calculates the set frequency fS at a frequency corresponding to the duty. Inverter output voltage VIV having a frequency that is automatically set can be generated with the operation pattern described above, and convenience can be improved.

  Further, since the external device 3 according to the present invention is a temperature controller or PLC (programmable controller) that outputs a time-division proportional pulse PTD, it can output an arbitrary pulse or pulse train, and an inverter having an arbitrary frequency pattern An output voltage VIV can be generated.

  FIG. 2 is a block diagram showing the principal part of an embodiment of the frequency calculation means according to the present invention. In FIG. 2, the frequency calculation means 8 is basically composed of a microprocessor and a memory, and includes a control means 12, a timing means 13, a duty calculation means 14, a deviation calculation means 15, a multiplication means 16, an addition means 17, and a storage means 18. Prepare.

  The control unit 12 controls the overall operation of the frequency calculating unit 8 and also controls the sequence operations of the time measuring unit 13, the duty calculating unit 14, the deviation calculating unit 15, the multiplying unit 16, the adding unit 17 and the storage unit 18.

  The control means 12 controls the time-measurement means 13 to take the time-division proportional pulse PTD, time the pulse ON time TON and OFF time TOFF, and store the time-measured pulse ON time TON and OFF time TOFF in the storage means 18. Do.

  Further, the control means 12 reads the ON time TON and the OFF time TOFF from the storage means 18, calculates the duty DU {= TON / (TON + TOFF)} by the duty calculation means 14, and stores the calculated duty DU in the storage means 18. Control.

  Further, the control unit 12 reads the set upper limit frequency fMX and the set lower limit frequency fMN that are input from the input unit 11 and are already stored in the storage unit 18, and the deviation calculating unit 15 uses the deviation frequency frequency Δf (= fMX−fMN). And the control for storing the deviation frequency Δf (= fMX−fMN) in the storage means 18 is executed.

  Further, the control means 12 reads the deviation frequency Δf (= fMX−fMN) and the duty DU {= TON / (TON + TOFF)} from the storage means 18, and the multiplication means 16 uses the deviation frequency Δf (= fMX−fMN) and the duty DU. Multiplication (= Δf × DU) of {= TON / (TON + TOFF)} is performed, and control for storing the multiplication result Δf × DU in the storage means 18 is executed.

  Further, the control means 12 reads the multiplication result Δf × DU and the set lower limit frequency fMN already stored from the storage means 18, and the addition means 17 adds the multiplication result Δf × DU and the set lower limit frequency fMN to set the set frequency fS. Control for providing (= Δf × DU + fMN) to the bridge drive circuit 9 shown in FIG. 1 is executed.

  The time measuring means 13 has a counter function and a timer function. Under the control of the control means 12, the time division proportional pulse PTD is measured for the on time TON and the off time TOFF, and the on time TON and the off time TOFF are stored in the storage means 18. To do.

  The duty calculation means 14 has an addition function and a division function, and calculates the duty DU = TON / (TON + TOFF) using the ON time TON and the OFF time TOFF read from the storage means 18 under the control of the control means 12. The calculated duty DU is stored in the storage means 18.

  The deviation calculation means 15 has a subtraction function, and calculates the deviation (= fMX−fMN) between the preset upper limit frequency fMX and the preset lower limit frequency fMN read from the storage means 18 under the control of the control means 12. The deviation frequency Δf (= fMX−fMN) is stored in the storage means 18.

  The multiplication unit 16 has a multiplication function, and is controlled by the control unit 12 to multiply the deviation frequency Δf (= fMX−fMN) read from the storage unit 18 by the duty DU {= TON / (TON + TOFF)} (= Δf). × DU) is executed, and the multiplication result (= Δf × DU) is stored in the storage means 18.

  The adding means 17 has an adding function and an output function, and adds the multiplication result (= Δf × DU) read from the storage means 18 and the preset lower limit frequency fMN stored in advance under the control of the control means 12 (= Δf × DU + fMN) and the addition result (= Δf × DU + fMN) is output to the bridge drive circuit 9 as the set frequency fS.

  Therefore, the set frequency fS = {fMN + TON × (= fMX−fMN) / (TON + TOFF)}. When the duty DU of the time division proportional pulse PTD is set to 0 to 1, the set frequency fS is set to the set lower limit frequency. It can be set in the range from fMN to the set upper limit frequency fMX.

  If the duty DU of the time division proportional pulse PTD is equal, the set frequency fS becomes a constant value regardless of the period (corresponding to the frequency) of the time division proportional pulse PTD.

  FIG. 4A is a set frequency time characteristic diagram of an inverter output voltage according to an embodiment of the inverter apparatus according to the present invention, and FIG. 4-B is a set frequency time characteristic of an inverter output voltage according to another embodiment of the inverter apparatus according to the present invention. FIG.

  In FIG. 4-a, the set frequency fS of the inverter output voltage VIV is the set lower limit frequency fMN (for example, when the time division proportional pulse PTD is not input (0) (0 ≦ t <ta, tb <t) (for example, 10 Hz).

  The set frequency fS of the inverter output voltage VIV is a constant value between the set lower limit frequency fMN and the set upper limit frequency fMX when the duty DU of the time division proportional pulse PTD is constant (time ta ≦ t ≦ tb). For example, 80 Hz).

  On the other hand, in FIG. 4B, the set frequency fS of the inverter output voltage VIV is the set lower limit frequency fMN when the time division proportional pulse PTD is not input (0) (0 ≦ t <t1, t4 <t). (E.g., 10 Hz), but by gradually changing the duty DU of the time-division proportional pulse PTD, it is gradually increased from the set lower limit frequency fMN (e.g., 10 Hz) (t1≤t≤t2), and a constant frequency (For example, 80 Hz) is continued (t2 ≦ t ≦ t3), and then gradually decreased from the frequency of 80 Hz (time t3 <t <t4) to reach the set lower limit frequency fMN.

  Thereby, it is possible to automatically execute arbitrarily setting and changing the set frequency fS of the inverter output voltage VIV required for the load 5 (motor).

  The storage means 18 comprises a memory such as an EEPROM or a flash memory, and is based on the set upper limit frequency fMX, the set lower limit frequency fMN, and the time division proportional pulse PTD set from the input means 11 at the beginning of the use of the inverter device 4. The ON time TON, OFF time TOFF, calculated duty DU, deviation frequency Δf (= fMX−fMN), and multiplication result Δf · DU are stored.

  In the present embodiment, the inverter device of the inverter system has been described. However, since a single inverter device has the same configuration and the same function, the description thereof is omitted to avoid duplication.

  Thus, the frequency calculating means 8 according to the present invention comprises the time measuring means 13 for measuring the ON time ON time and the OFF time TOFF of the time division proportional pulse PTD, the ON time TON and the OFF time TOFF timed by the time measuring means 13. From the duty calculating means 14 for calculating the duty DU from the above, the deviation calculating means 15 for calculating the deviation frequency (Δf = fMX−fMN) of the upper limit value fMX and the lower limit value fMN of the preset set frequency, and the duty calculating means 14 The multiplication means 16 for multiplying the duty DU of the deviation by the deviation frequency Δf from the deviation calculation means 15 (= Δf × DU), the addition means 17 for adding the multiplication result (Δf × DU) of the multiplication means 16 and the set lower limit frequency fMN, , ON time TON, OFF time TOFF, duty DU, set upper limit frequency fMX value, set lower limit frequency fMN value, deviation frequency Δf, multiplication result Δf × DU Since the storage means 18 for storing the sequence operation program and the control means 12 for controlling the sequence operation are provided, the frequency pattern of the inverter output can be automatically set according to the pattern of the time division proportional pulse PTD. The inverter output voltage VIV having an arbitrary frequency pattern required for the load 5 can be generated.

  Next, an application to a target device controlled by the inverter system will be described. The inverter system application uses a temperature controller for the external device 3, a motor for the load 5, the inverter device 4 and the motor as actuators of the temperature controller, and controls the flow rate of the pump and the concentration control of the chemical solution. The application will be described.

  FIG. 5 is an inverter system application configuration diagram for an embodiment of the pump flow rate control according to the present invention. In FIG. 5, the inverter system 19 includes an inverter device 20, a temperature regulator 21, a motor 22, a pump 23, and a flow rate sensor 24.

  When the flow sensor 24 detects the flow rate of water or the like that the pump 23 flows and provides the flow rate sensor signal S1 to the temperature controller 21, the temperature controller 21 compares the supplied sensor signal S1 with the set flow rate, A time division proportional pulse PTD corresponding to the difference between the set flow rate and the sensor signal S1 is provided to the inverter device 20.

  The inverter device 20 drives the motor 22 with the inverter output voltage VIV of the set frequency fS corresponding to the provided time-division proportional pulse PTD, and the motor 22 rotates at the set frequency fS and the inverter output voltage VIV to drive correspondingly. The pump 23 is driven with the torque TD.

  When the difference between the set flow rate and the sensor signal S1 is large, the motor 22 is driven by the inverter output voltage VIV having a high set frequency fS, and by driving the pump 23 at a large rotational speed (drive torque TD), Run a large flow of water.

  Thus, the time division proportional pulse PTD is supplied from the temperature controller 21 according to the flow rate, and the inverter device 20 drives the motor 22 with the inverter output voltage VIV in which the set frequency fS is changed, and the rotation speed of the motor 22 is increased. Changes to control the flow rate of the pump 23.

  FIG. 6 is a block diagram of an inverter system applied to an embodiment of the chemical concentration control according to the present invention. In FIG. 6, the inverter system 25 includes an inverter device 20, a temperature controller 21, a motor 22, a stirring tank 26 having a propeller 29, a hopper 27, and a concentration sensor 28.

  When the concentration sensor 28 detects the concentration of the chemical solution in the agitation tank 26 and provides the concentration sensor signal S2 to the temperature controller 21, the temperature controller 21 compares the supplied sensor signal S2 with the set concentration, A time division proportional pulse PTD according to the difference between the set concentration and the sensor signal S2 is provided to the inverter device 20.

  The inverter device 20 drives the motor 22 with the inverter output voltage VIV of the set frequency fS corresponding to the provided time-division proportional pulse PTD, and the motor 22 rotates at the set frequency fS and the inverter output voltage VIV to drive correspondingly. The propeller 29 of the agitation tank 26 is rotated with a torque TD to agitate the chemical solution.

  When the difference between the set concentration and the sensor signal S2 is large, the motor 22 is driven by the inverter output voltage VIV having a high set frequency fS, and by rotating the propeller 29 at a large rotation speed (drive torque TD), The concentration of the chemical solution is made uniform. If the sensor signal S2 does not reach the set concentration even after a lapse of time, the temperature controller 21 determines that the chemical is insufficient and notifies the hopper 27 of an alarm output SA. Encourage the introduction of chemicals to

  As described above, the time-division proportional pulse PTD is supplied from the temperature controller 21 according to the concentration, and the inverter device 20 drives the motor 22 with the inverter output voltage VIV with the set frequency fS changed, and the rotation speed of the motor 22 is increased. Changes to control the concentration of the chemical in the agitation tank 26.

  As described above, in the inverter systems 19 and 25 according to the present invention, the external device is configured by the temperature controller 21, the load is configured by the motor 22, and the inverter device 20 and the motor 22 are applied as actuators of the temperature controller 21. Therefore, the control amount (for example, flow rate and concentration) of the target device is detected by the sensors S1 and S2, and the time-division proportional pulse PTD corresponding to the difference between the target control amount and the control amount detected by the temperature regulator 21 is converted into an inverter device. 20, the inverter device 20 rotates the motor 22 with the inverter output voltage VIV of the set frequency fS corresponding to the time-division proportional pulse PTD, and the control amount (for example, flow rate, concentration) of the target device is set as the target control amount. The control amount of the target device can be automatically controlled to improve convenience.

  Then, the frequency setting method of an inverter apparatus is demonstrated. FIG. 7 is an operation flowchart of the main part of one embodiment of the frequency setting method for the inverter device according to the present invention. The operation flow will be described with reference to FIG.

  In FIG. 7, in step S1, a time division proportional pulse is captured.

  In step S2, the on time and the off time are measured. The operations of step S1 and step S2 are executed by the control means 12, the time measuring means 13, and the storage means 18.

  In step S3, the duty is calculated from the ON time and OFF time of the time division proportional pulse. The operation in step S3 is executed by the control means 12, the duty calculation means 14, and the storage means 18.

  In step S4, a deviation frequency between the set upper limit frequency and the set lower limit frequency is calculated. The operation of step S4 is executed by the control means 12, the deviation calculation means 15 and the storage means 18.

  In step S5, the deviation frequency is multiplied by the duty. The operation of step S5 is executed by the control means 12, the multiplication means 16, and the storage means 18.

  In step S6, the set lower limit frequency is added to the multiplication result to determine the set frequency. The operation of step S6 is executed by the control means 12, the adding means 17 and the storage means 18.

  As described above, the frequency setting method for the inverter device according to the present invention includes the step S1 for capturing the time division proportional pulse, the step S2 for measuring the on time and the off time, and the duty ratio from the on time and the off time of the time division proportional pulse. Step S3 for calculating the difference, Step S4 for calculating the deviation frequency between the set upper limit frequency and the set lower limit frequency, Step S5 for multiplying the deviation frequency and the duty, and adding the set lower limit frequency to the multiplication result to determine the set frequency. Since step S6 is provided, the frequency pattern of the inverter output can be automatically set according to the pattern of the time-division proportional pulse, and convenience can be improved.

  The inverter system and the inverter device according to the present invention can automatically determine the set frequency of the inverter output corresponding to the time-division proportional pulse, and can be applied to all inverter systems and inverter devices that manually set the set frequency. be able to.

System block configuration diagram of an embodiment of an inverter system according to the present invention Block diagram of main part of one embodiment of frequency calculation means according to the present invention Example waveform diagram of time-division proportional pulse Example waveform diagram of time-division proportional pulse One embodiment of the inverter device according to the present invention Setting frequency time characteristic diagram of inverter output voltage Another embodiment of the inverter device according to the present invention The set frequency time characteristic diagram of the inverter output voltage One embodiment of inverter system application configuration diagram for pump flow control according to the present invention One embodiment of inverter system application configuration diagram for chemical solution concentration control according to the present invention Operation flow diagram of main part of one embodiment of frequency setting method for inverter device according to the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 19, 25 Inverter system 2 AC power source 3 External device 4,20 Inverter device 5 Load 6 Rectifier circuit 7 Bridge circuit 8 Frequency calculating means 9 Bridge drive circuit 10 Display means 11 Input means 12 Control means 13 Timekeeping means 14 Duty calculation means DESCRIPTION OF SYMBOLS 15 Deviation calculation means 16 Multiplication means 17 Addition means 18 Storage means 21 Temperature controller 22 Motor 23 Pump 24 Flow rate sensor 26 Stirrer tank 27 Hopper 28 Concentration sensor 29 Propeller C Smoothing capacitor VAC AC voltage VDC DC voltage VIV Inverter output voltage PTD Time division Proportional pulse fMX setting upper limit frequency fMN setting lower limit frequency fS setting frequency SPW PWM signal TON ON time TOFF OFF time DU duty Δf deviation frequency Δf · DU multiplication result S1, S2 sensor signal TD drive torque SA alarm output

Claims (6)

AC power source of commercial frequency, an external device that outputs a time-division proportional pulse, an inverter device that generates an inverter output of a variable frequency based on the AC output from the AC power source and the time-division proportional pulse from the external device, An inverter system comprising a load, wherein the inverter device comprises a frequency calculation means for calculating a duty from a time-division proportional pulse and calculating a set frequency at a frequency corresponding to the duty, the frequency calculation means Is
A time measuring means for measuring the on-time and off-time of the time-division proportional pulse;
Duty calculating means for calculating a duty from the on time and the off time measured by the time measuring means;
Deviation calculation means for calculating the deviation frequency of the upper limit value and lower limit value of the preset set frequency,
Multiplying means for multiplying the duty from the duty calculating means by the deviation frequency from the deviation calculating means;
Addition means for adding the multiplication result of the multiplication means and the set frequency lower limit value, and storing the on time, off time, duty, set frequency upper limit value, set frequency lower limit value, deviation frequency, multiplication result, and program for sequence operation Storage means for storing
Control means for controlling the sequence operation;
Inverter system comprising the. The inverter system according to claim 1, wherein the external device is a temperature controller that outputs a time-division proportional pulse. The inverter system according to claim 1, wherein the external device is a PLC (programmable controller) that outputs time-division proportional pulses. The said external apparatus is comprised with the said temperature regulator, the said load is comprised with a motor, The said inverter apparatus and the said motor are applied as an actuator of the said temperature regulator, The Claim 1 or Claim 2 characterized by the above-mentioned. Inverter system. When based on the division proportional pulse an inverter apparatus that generates an inverter output of the variable frequency, when calculating the duty from the division proportional pulse, and configured to include a frequency calculation means for calculating a set frequency at a frequency corresponding to the duty The frequency calculation means is
A time measuring means for measuring the ON time and the OFF time of the time-division proportional pulse, a duty calculating means for calculating a duty from the ON time and the OFF time timed by the time measuring means,
Deviation calculation means for calculating the deviation frequency of the upper limit value and lower limit value of the preset set frequency,
Multiplying means for multiplying the duty from the duty calculating means by the deviation frequency from the deviation calculating means;
Addition means for adding the multiplication result of the multiplication means and the set frequency lower limit value, and storing the on time, off time, duty, set frequency upper limit value, set frequency lower limit value, deviation frequency, multiplication result, and program for sequence operation Storage means for storing
Control means for controlling the sequence operation;
Inverter apparatus comprising the. An inverter device frequency setting method for setting an inverter output frequency corresponding to a time-division proportional pulse,
Capturing a time-division proportional pulse;
A step of timing on and off times;
Calculating the duty from the on-time and off-time of the time-division proportional pulse;
Calculating a deviation frequency between the set upper limit frequency and the set lower limit frequency;
Multiplying the deviation frequency by the duty;
Adding a set lower limit frequency to the multiplication result to determine the set frequency;
A frequency setting method for an inverter device, comprising:

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