WO2001041291A1 - Inverter controller - Google Patents
Inverter controller Download PDFInfo
- Publication number
- WO2001041291A1 WO2001041291A1 PCT/JP1999/006643 JP9906643W WO0141291A1 WO 2001041291 A1 WO2001041291 A1 WO 2001041291A1 JP 9906643 W JP9906643 W JP 9906643W WO 0141291 A1 WO0141291 A1 WO 0141291A1
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- WO
- WIPO (PCT)
- Prior art keywords
- voltage
- instantaneous
- output
- inverter
- pulse width
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
- H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
- H02P27/08—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters with pulse width modulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/00421—Driving arrangements for parts of a vehicle air-conditioning
- B60H1/00428—Driving arrangements for parts of a vehicle air-conditioning electric
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60H1/00—Heating, cooling or ventilating [HVAC] devices
- B60H1/32—Cooling devices
- B60H1/3204—Cooling devices using compression
- B60H1/3222—Cooling devices using compression characterised by the compressor driving arrangements, e.g. clutches, transmissions or multiple drives
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/53871—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current
- H02M7/53873—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with automatic control of output voltage or current with digital control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0016—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters
- H02M1/0022—Control circuits providing compensation of output voltage deviations using feedforward of disturbance parameters the disturbance parameters being input voltage fluctuations
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/80—Technologies aiming to reduce greenhouse gasses emissions common to all road transportation technologies
- Y02T10/88—Optimized components or subsystems, e.g. lighting, actively controlled glasses
Definitions
- the present invention relates to an inverter control device applied to an air conditioner, and more particularly to an inverter control device for controlling a compressor motor.
- the commercial AC voltage is once converted to a DC voltage by a converter and a smoothing capacitor, and the DC voltage is again controlled by PWM (Pulse Width Modulation) in the inverter.
- PWM Pulse Width Modulation
- An inverter controller is provided for controlling a compressor motor (an induction motor, a DC brushless motor, etc.) driven by the output AC voltage by converting the output AC voltage.
- the converter section includes a diode bridge circuit, and converts a commercial AC voltage to a DC voltage.
- the smoothing capacitor is connected in parallel with the converter unit, and smoothes the DC voltage converted by the converter unit.
- the inverter section is composed of switching elements such as switching transistors, and the DC voltage is converted to a three-phase alternating current having a predetermined frequency by a PWM control in which the switching elements are turned on and off at predetermined times. It is a three-phase inverter that converts to AC voltage.
- a PWM switching pattern for instructing the switching timing of the switching element is input to the inverter.
- This PWM switching pattern is generated based on a target voltage corresponding to the operating frequency of the compressor motor by well-known VZF (Voltage / Frequency) control.
- VZF Voltage / Frequency
- the operating frequency is set to a value according to the air-conditioning load so that, for example, the difference between the set temperature of the air conditioner and the room temperature is large, and the value becomes high in such a case.
- the output AC voltage from the inverter is the same as the DC voltage V DC shown in FIG. It is expressed as the product (area S) of the PWM width W.
- the PWM width W is controlled so that the output AC voltage matches the target voltage.
- the DC voltage VDC shown in the figure is a DC voltage smoothed by a smoothing capacitor, and the PWM width W corresponds to a period when the switching element in the inverter is turned on.
- the commercial AC voltage when the commercial AC voltage is supplied to the converter section, the commercial AC voltage is converted to a DC voltage by being full-wave rectified by the converter section. Then, this DC voltage is supplied to the inverter after being smoothed by a smoothing capacitor.
- the PWM width W is calculated from the DC voltage VDC and the target voltage shown in FIG. That is, the PWM width W is the result of dividing the target voltage (area S) by the DC voltage VDC .
- the DC voltage V DC is treated as a constant value.
- a PWM switching pattern corresponding to the PWM width W is input to the inverter unit.
- the switching element is turned on / off at a predetermined timing according to the PWM switching pattern, so that the DC voltage is converted into an output AC voltage having a predetermined PWM width.
- the output AC voltage is supplied to the compressor motor, so that the compressor motor is driven.
- the DC voltage VDC is a constant value.
- the DC voltage V DC also fluctuates with the fluctuation of the commercial AC voltage. Therefore, in the conventional inverter control device, a deviation occurs between the PWM width W calculated when the DC voltage VDC fluctuates and the theoretical value for performing appropriate control.
- the constant PWM width is calculated irrespective of the fluctuation of the DC voltage VDC shown in Fig. 7 due to the fluctuation of the commercial AC voltage, so the output actually supplied from the inverter to the compressor motor A situation occurs where the AC voltage (corresponding to the area S) cannot follow the target voltage.
- FIG. 8 (A) and (B) show the variation of the DC voltage V DC Are shown in the case where the output AC voltage V ou from the power supply varies. That is, the DC voltage VDC shown in FIG. 8 (a) is desirably a constant value, but increases with the passage of time due to the fluctuation of the commercial AC voltage, and then decreases. When such a DC voltage V DC is varied, as shown in Figure 8 (B), the output AC voltage V 0ut 'temporal output AC mean voltage was convex Average VA 0ut' also you change.
- the DC voltage VDC fluctuates from time to time as DC voltage V DC1 —DC voltage V DC2 ⁇ ... ⁇ DC voltage V DC5. due to the calculated PWM width W and the DC voltage v oc despite a constant value, taking the area S, ⁇ S 5 are different values of the output AC voltage component V ⁇ 5 '.
- the DC current I DC shown in FIG. 9 (A) includes ripple I R 1 because an inexpensive circuit is used to reduce the cost of the inverter control device.
- This DC current I DC is a voltage smoothed by the smoothing capacitor.
- the size of the ripple I RI is determined by circuit constants, loads, and the like.
- the DC current I DC including the ripple I R1 shown in FIG. 9 (A) is switched by the PWM control, so that the inverter 9
- the output AC current I 0 UT ′ shown in FIG. 7B also includes the ripple I R 2 ′.
- the peak value of the ripple IR 2 ′ corresponds to the peak value of the ripple IR 1 (see FIG. 9 (A)).
- the DC current flowing through the switching element in the inverter section has a threshold, and when the current exceeds the value, the overcurrent protection circuit that cuts off the DC current has a large capacity and high precision as a switching element. There was also a problem that the cost was high because it had to be used.
- the present invention has been made in view of the above, and it is possible to operate an AC load in an optimal state at a low cost and at the same time, to operate an AC load in an optimal state regardless of power supply circumstances.
- the purpose of the present invention is to provide an invertor control device that can perform the operation. Disclosure of the invention
- An inverter control device includes a converter for converting a commercial AC voltage to a DC voltage, and converting the DC voltage to an output AC voltage having a predetermined frequency based on a specified pulse width by a pulse width modulation method.
- Inverter means for supplying the output AC voltage to an AC load, Instantaneous DC voltage detecting means for detecting an instantaneous value of the DC voltage, and a change in the detection result of the instantaneous DC voltage detecting means, the output AC voltage And correcting means for correcting the pulse width so that the pulse width is maintained at a desired value.
- the inverter control device According to the inverter control device according to the present invention, with the fluctuation of the commercial AC voltage, The instantaneous value of the DC voltage also fluctuates. The fluctuation of the instantaneous value of the DC voltage is reflected in the detection result of the instantaneous DC voltage detecting means. Therefore, the correction means corrects the pulse width according to the fluctuation of the detection result. As a result, the output AC voltage supplied from the inverter overnight to the AC load is maintained at a desired value without being affected by the fluctuation of the instantaneous value of the DC voltage due to the fluctuation of the commercial AC voltage.
- the desired output AC voltage is supplied to the AC load without being affected by the fluctuation of the commercial AC voltage.
- the AC load can be operated in the state.
- the correction unit includes a ratio of a detection result of the instantaneous DC voltage detection unit to a preset reference voltage; The pulse width is corrected based on a result of multiplying the pulse width by a target voltage which is a target value of the pulse width.
- the correction means corrects the pulse width based on the result of multiplying the ratio between the detection result of the instantaneous DC voltage detection means and the reference voltage by the target voltage.
- the desired output AC voltage is supplied to the AC load without being affected by fluctuations in the commercial AC voltage, so that the AC load can be operated with optimum load characteristics and efficiency.
- the invertor control apparatus is characterized in that in the inverter control apparatus described above, there is provided a setting changing means for changing the setting of the reference voltage in accordance with the commercial AC voltage.
- the reference voltage is changed according to the commercial AC voltage by the setting changing means, so that the power supply conditions (rated value and stability of the commercial AC voltage) are different in countries and countries. Even in a local area, a desired value of the output AC voltage can be supplied to the AC load, so that the AC load can be operated in an optimal state regardless of the country or region.
- the invertor control device is the invertor control device described above, wherein the correction means is provided for each period of the modulation carrier in the pulse width modulation method. The ratio is calculated, and the pulse width is corrected.
- the pulse width is corrected for each cycle of the modulation carrier, so that the influence of the ripple included in the commercial AC voltage is reduced.
- the reliability can be improved, and the cost (overcurrent cut-off circuit) required for countermeasures against ripples can be reduced.
- the ratio (reference voltage Z detection result of the instantaneous DC voltage detection means) is calculated every n cycles of the modulation carrier, so that the ratio is calculated every cycle.
- the number of times the ratio is calculated per unit time is reduced as compared with the case where the correction is performed, and the correction can be realized by an inexpensive arithmetic circuit, so that the cost can be reduced.
- the instantaneous DC voltage detection means may be configured to control the DC voltage by a non-insulated circuit grounded to have a common potential with the correction means. Is directly detected.
- detection time can be shortened compared with the case where DC voltage detection is performed using an insulating circuit such as a photo cover.
- FIG. 1 is a block diagram showing a configuration of a first embodiment according to the present invention.
- FIG. 2 is a diagram showing a power supply voltage and a reference voltage Vref in Europe, China and Australia
- FIG. FIG. 4 is a diagram showing VZF pattern data.
- FIG. 4 shows the output AC voltage V shown in FIG.
- FIG. 5 is a diagram showing a waveform of a UT .
- FIG. 5 is a flowchart illustrating an operation of the first embodiment.
- FIG. 6 is a flowchart of a second embodiment according to the present invention.
- FIG. 7 is a flowchart for explaining the operation.
- FIG. 7 is a diagram for explaining a method of determining the output AC voltage in the conventional inverter control device.
- FIG. FIG. 9 is a diagram for explaining the effects of the first embodiment.
- FIG. 9 is a diagram for explaining the problems of the conventional inverter control device and the effects of the first embodiment.
- FIG. 1 is a block diagram showing a configuration of the first embodiment.
- the inverter control device 10 shown in this figure is provided in the outdoor unit of the air conditioner, converts the commercial AC voltage VAC into a DC voltage VDC, and then converts this DC voltage VDC into a desired three-phase AC
- This is a device that controls the compressor motor 70 by converting it back to the output AC voltage V OUT.
- a commercial AC power source 20 supplies a commercial AC voltage V AC to the converter unit 3 0.
- V AC commercial AC voltage
- the converter unit 30 is constituted by a diode Purijji circuits connected in parallel to a commercial AC power source 20, that converts the commercial AC voltage V AC to a DC voltage.
- the smoothing capacitor 40 is connected in parallel to the converter 30 and smoothes the DC voltage converted by the converter 30.
- the voltage between the terminals of the smoothing capacitor 40 is the smoothed DC voltage VDC .
- This DC voltage V DC is the commercial AC voltage 2 It fluctuates under the influence of the fluctuation of 0.
- the instantaneous DC voltage detecting section 50 is connected in parallel to the smoothing capacitor 40 and is composed of a voltage dividing resistor 51 and a voltage dividing resistor 52 connected in series.
- the instantaneous DC voltage detection unit 5 0, the instantaneous value of the DC voltage V DC, and detects as a divided instantaneous DC voltage V DC S. That is, the instantaneous DC voltage V DCS is a voltage between the connection point C between the voltage dividing resistors 51 and 52 and the ground, and is used as an AZD (Analog / Digi tal) The size (0 V or more and 5 V or less) that can be directly processed by the conversion port (not shown). In the following, for convenience of description, a DC voltage V DC and the instantaneous DC voltage V DC S regarded as equivalent.
- a switching element such as a transistor or an IPM (Intelligent Power Module), and has a DC voltage V DC with a predetermined frequency by PWM control in which the switching element is turned on and off at a predetermined timing.
- This is a three-phase inverter for converting to a three-phase AC output AC voltage V 0 UT .
- the IPM is a device that integrates switching elements, drive circuits, protection circuits, and the like into a single D module, and is a means for systematizing and intelligentizing power devices.
- the compressor motor 70 is provided in an outdoor unit (not shown) of the air conditioner, and is driven by a three-phase output AC voltage V 0UT supplied from the inverter unit 60.
- As the compressor motor 70 an induction motor, a DC brushless motor, or the like is used.
- Target voltage output unit 8 by known VF (Voltage / Frequency) control and output the target voltage V ra corresponding to the operation frequency f m derived from OPERATION frequency Sashiawase signal S f ra.
- the operating frequency f ra takes a value according to the air-conditioning load so that, for example, when the difference between the set temperature of the air conditioner and the room temperature is large, the value increases.
- Operation frequency command signal S fm is a signal corresponding to the operation frequency i m.
- Target electric JEV ra is the voltage to take optimum values for the operating frequency i m, determined from VZF pattern data shown in Figure 3.
- This target voltage V ra is used when calculating a PWM width W described later.
- the VZF pattern data shown in (1) shows the relationship between the operating frequency f m on the horizontal axis and the target voltage V m on the vertical axis, and has characteristics that can control the compressor motor 70 most efficiently.
- the VZF pattern data is stored in a memory (not shown) of the target voltage output section 80.
- the reference voltage setting section 90 is for setting the reference voltage Vref in the calculation section 100.
- the reference voltage V ref in Europe is 230 X 1.414 V shown in Fig. 2 (A).
- the reference voltage V ref in China is 220 ⁇ 1.414 V shown in FIG. 2 (B).
- the reference voltage V ref in Australia is 240 ⁇ 1.414V .
- the reference voltage setting unit 9 in accordance with the commercial AC voltage V AC worldwide, sets a matching reference voltage V ref in the country.
- the arithmetic unit 1 00 based on the target voltage V m from the target voltage output unit 80 generates a PWM switching pattern signal P, and outputs it to inverter Isseki unit 60.
- the PWM switching pattern signal P is for controlling the timing of turning on and off the switching element of the inverter 60, in other words, for controlling the PWM width of the output AC voltage V ou ⁇ .
- the arithmetic unit 100 does not simply generate the PWM switching pattern signal P from the target voltage V ra , but a DC voltage correction coefficient for compensating for the variation of the DC voltage V DC. and it generates a PWM sweep rate Tsu quenching pattern signal P from the result obtained by multiplying the corrected target voltage V m (corrected target voltage V ma) with a.
- the arithmetic unit 100 calculates the DC voltage correction coefficient A from the following equation (1), and then calculates the correction target voltage Vraa from the following equation (2).
- the target voltage V ra is corrected based on the variation of the instantaneous DC voltage V DCS (DC voltage V DC ) up to the corrected target voltage V ra J in equation (2). For example, if the commercial AC voltage V AC has decreased higher than the rated value, the instantaneous DC voltage V DCS (DC voltage V DC) is higher than the reference voltage V ref. In this case, from a child to a DC voltage correcting coefficient A is less than 1, the corrected target voltage V raa is less than target voltage V m. In other words, the instantaneous DC voltage V becomes higher than the reference voltage V ref, the correction for the corrected target voltage V raa to lower Ku than the target voltage V m is performed.
- the instantaneous DC voltage V DC s (DC voltage V DC) is lower than the reference voltage V ref.
- the DC voltage correction coefficient A is greater than 1, the corrected target voltage V raa may turn higher than the target voltage V m. That is, when the instantaneous DC voltage V DCS becomes lower than the reference voltage V ref, a correction is performed to make the corrected target voltage V raa higher than the target voltage V ra .
- the DC voltage correction coefficient A is 1, the corrected target voltage V raa has the same value as the target voltage v m .
- Arithmetic unit 1 00 a result of dividing the corrected target voltage V raa instantaneous DC voltage V DCS sought after as P WM width, generates a PWM sweep rate Tsu quenching pattern signal P corresponding to the PWM width, Invar this Evening output to 60.
- the arithmetic unit 100 is grounded so that it has the same potential as one end of the voltage dividing resistor 52.
- the reference voltage setting section 90 shown in FIG. 1 sets a reference voltage Vref suitable for the power supply situation (commercial AC voltage) of the country (region) where the air conditioner is used in the arithmetic section 100.
- the reference voltage setting section 90 sets 230 X 1.414 V shown in FIG. 2 (A) as the reference voltage Vref .
- the reference voltage setting unit 90 The reference voltage V ref is set to 220 ⁇ 1.414 V shown in FIG. 2 (B).
- the reference voltage setting unit 90 sets the reference voltage Vr "to 240 V and 4 14 V.
- the commercial AC voltage V AC from a commercial AC power source 2 0 is supplied to the converter unit 3 0, the commercial AC voltage V AC, after being full-wave rectified by the converter unit 3 0, flat smooth capacitor 4 0 And converted to a DC voltage V DC .
- the DC voltage V DC is divided by the voltage dividing resistor 51 and the voltage dividing resistor 52 of the instantaneous DC voltage detecting section 50, so that the instantaneous DC voltage V between the connection point C and the ground is obtained.
- DCS is detected.
- This instantaneous DC voltage VDCS is input to an AZD conversion port (not shown) of the arithmetic unit 100.
- the target voltage output section 80 outputs the VZF pattern shown in FIG. After obtaining the target voltage V ra corresponding to the operation frequency f ra from the data, the target voltage V ra is output to the arithmetic unit 100.
- step SA1 the arithmetic unit 100 proceeds to step SA1 shown in FIG.
- This carrier cycle is the cycle of the carrier (modulated wave) in the PWM control of the inverter section 60.
- step S A the arithmetic unit 100 executes step S A
- step SA 2 the arithmetic unit 1 0 0 after taking the target voltage V m from the target voltage output unit 8 0, the process proceeds to scan Tetsupu SA3.
- the target voltage Vm is assumed to be a constant value.
- step SA 3 the arithmetic unit 1 0 0 after taking directly the instantaneous DC voltage VDCS from the instantaneous DC voltage detection unit 5 0 through AZD conversion port (not shown), the process proceeds to step SA 4 c
- step SA4 the operation unit 100 calculates the reference voltage V from the reference voltage setting unit 90. Calculate the DC voltage correction coefficient A by substituting ref and the instantaneous DC voltage VDCS taken in step SA3 into the above-mentioned equation (1), and then proceed to step SA5.
- step SA7 the arithmetic unit 100 generates a PWM switching pattern signal P corresponding to the PWM width.
- the arithmetic unit 100 returns to step SA1 and repeats the above determination.
- the inverter unit 60 When the PWM switching pattern signal P is input to the inverter unit 60, the inverter unit 60 performs DC control by turning on and off the switching elements in accordance with the PWM switching pattern signal P by the DC voltage V DC ( DC voltage V DC!: See Fig. 8 (C)) is converted to the output AC voltage V 0UT and supplied to the compressor motor 70. At this time, as shown in FIG. 8 (C), the PWM width of the output AC voltage element V, at the output AC voltage V 0UT is the PWM width calculated in step SA6 .
- step SA 2 the arithmetic unit 1 0 0 after capturing the target voltage V m from the target voltage output unit 8 0, the process proceeds to step SA 3.
- step SA3 the arithmetic unit 100 acquires the instantaneous DC voltage VDCS from the instantaneous DC voltage detection unit 50, and then proceeds to step SA4.
- the commercial AC voltage V AC is higher than the rated value, assuming the DC voltage V DC is a view the 8 (C) DC voltage V DC2 shown in (> reference voltage V ref), a DC voltage compensation coefficient A (reference voltage V ref , instantaneous DC voltage V DCS ) is a value less than 1.
- step SA 5 the arithmetic unit 1 0 0 assigned to the target voltage V m captured at Step SA 2, and Step SA 4 DC voltage correction coefficient calculated in A described above (the ⁇ 1) (2)
- step SA6 the correction target voltage V ma is a value less than the target voltage V ra because the DC voltage correction coefficient A is less than 1.
- step SA 6 the arithmetic unit 1 0 0, the corrected target voltage V raa instantaneous DC voltage V DCS captured at Step SA 3: the result of dividing the (two DC voltage V DC2 Figure 8 (C) see) after calculating the PWM width W 2 as shown in Figure 8 (c), the process proceeds to step SA 7.
- the PWM width W 2 the DC voltage V DC is the width small Ri by PWM width of before to rise.
- step SA 7 generates the PWM switching pattern signal P corresponding to the PWM width W 2 (Ku PWM width).
- the arithmetic unit 100 outputs the PWM switching pattern signal P to the receiver unit 60, returns to step SA1, and repeats the above determination.
- the inverter 60 When the PWM switching pattern signal P is input to the power driver 60, the inverter 60 generates a DC voltage V DC ( DC) by PWM control of turning on and off the switching element according to the PWM switching pattern signal P.
- DC voltage V: see Fig. 8 (C)) is converted to an output AC voltage V0UT , which is supplied to the compressor motor 70.
- the PWM width W 2 of the output AC voltage element ⁇ 2 at the output AC voltage V 0UT is opposite to the case where the DC voltage V DC2 is higher than the DC voltage V DC1 . It is smaller than the PWM width. That is, the output AC voltage component V, the area S of, as the area S of the output AC voltage component v 2 is the same area, is the PWM width W 2 is a P WMIIW, more width small. Therefore, the output AC average voltage VA, which is the average value of the output AC voltage V 0UT .
- the UT is maintained at a constant value regardless of the fluctuation of the DC voltage VDC caused by the fluctuation of the commercial AC voltage VAC (DC voltage VDC1 ⁇ DC voltage VDC2 ).
- step SA. 1 to step SA 7 by operating as described above for each carrier cycle is repeated, as shown in Figure 8 (C), to base of the output AC voltage component v 3 to v 5 area of Te S so equal, the PWM width W 3 ⁇ PWM width W 5 are variable in accordance with the increase and decrease of the DC voltage V DC3 ⁇ V 'DC5 Noso respectively.
- This makes the output AC average voltage VA. UT is, without being affected by the fluctuation of the DC voltage V DC due to the fluctuation of the commercial AC voltage V AC, the Wataruconnection constant value to all the time.
- step SA 4 the reduction of the commercial AC voltage V AC, when the DC voltage V DC is ruled lower than the reference voltage V ref, in step SA 4, the arithmetic unit 1 00, the reference voltage V ref from the reference voltage setting unit 90, and The DC voltage correction coefficient A is calculated by substituting the instantaneous DC voltage V DCS (reference voltage V ref ) taken in step SA 3 into the above-described equation (1), and then the process proceeds to step SA 5.
- the DC voltage correction coefficient A is more than unity.
- step SA5 the arithmetic unit 1 00, the target voltage V m fetched in step SA2, and step SA 4 DC voltage is calculated by the correction coefficient A (> 1)
- the correction target voltage V raa is a value exceeding the target voltage V m because the DC voltage correction coefficient A is a value exceeding 1.
- step SA 6 the arithmetic unit 1 00, a result of dividing the corrected target voltage V ma instantaneous DC voltage V DCS captured at Step SA 3, after calculating the PWM width, the process proceeds to step SA 7.
- This PWM width is larger than the PWM width shown in Fig. 8 (C).
- step SA 7 generates a PWM sweep rate Tsu quenching pattern signal P corresponding to the PWM width (> PW ⁇ W 1).
- the arithmetic unit 100 outputs the PWM switching pattern signal P to the inverter unit 60, returns to step SA1, and repeats the above determination.
- the inverter section 60 When the above-mentioned PWM switching pattern signal P is input to the inverter section 60, the inverter section 60 outputs a DC voltage V DC by PWM control of turning on and off the switching element according to the PWM switching pattern signal P.
- the voltage is converted into an AC voltage V 0UT and supplied to the compressor motor 70.
- the product (area) of the DC voltage V DC and the PWM width is the same as the area S shown in Fig. 8, so that the decrease in the DC voltage V DC due to the decrease in the commercial AC voltage V AC is obtained.
- the output AC average voltage VA 0UT is maintained at a constant value without being affected.
- the ratio between the instantaneous DC voltage V DCS detected by the instantaneous DC voltage detection unit 50 and the reference voltage V ref DC voltage correction coefficient A
- the ratio between the instantaneous DC voltage V DCS detected by the instantaneous DC voltage detection unit 50 and the reference voltage V ref DC voltage correction coefficient A
- the reference voltage setting unit 90 to set changes the reference voltage V,. Ef depending on the commercial AC voltage V AC, power situation (commercial AC voltage The rated AC voltage V 0UT can be supplied to the compressor motor 70 even in countries and regions where the rated value and stability of the compressor differ , so that the optimum condition can be maintained regardless of the country or region.
- the compressor motor 70 can be operated. Therefore, according to the first embodiment, stall of compressor motor 70 or overcurrent interruption due to insufficient voltage or overvoltage can be avoided.
- the PWM width is corrected for each carrier cycle, so that the output AC current I is increased as shown in FIGS. 9 (C) and (D). also extends the effect of correction for ripple I R2 included in Upushirontau. Therefore, according to the first embodiment, the ripple I R2 (see FIG. 9 (D)) included in the output alternating current I 0UT is compared with the conventional ripple I R2 ′ (see FIG. 9 (B)). To avoid overcurrent interruption due to ripple, improve reliability, and further reduce the cost for ripple countermeasures (cost of overcurrent interruption circuit and switching element). be able to.
- the instantaneous DC voltage V DCS is directly input to the arithmetic unit 100 via the AZD conversion port by using the instantaneous DC voltage detection unit 50 which is a non-isolated circuit.
- the detection time can be reduced as compared with the case where DC voltage is detected using an insulating circuit such as a fogger.
- the detection error of the instantaneous DC voltage V DCS is determined only by the variation in the resistance values of the voltage-dividing resistors 51 and 52, only the above-mentioned resistance values are calibrated only.
- the instantaneous DC voltage VDCS can be detected at low cost and with high accuracy.
- the correction target voltage V ma is calculated at the timing of one carrier cycle.
- the correction target voltage V ma may be calculated at the timing of the carrier cycle.
- this case will be described as a second embodiment.
- step SB1 the arithmetic unit 100 proceeds to step SB1 shown in FIG. 6, and determines whether or not the timing of the carrier cycle has been reached based on the result of counting a timer (not shown). The same judgment is repeated with the result set to “No”. Then, at the timing of the carrier period, the arithmetic unit 100 sets the determination result of step SB1 to “Yes” and proceeds to step SB2.
- step SB 2 the arithmetic unit 1 0 0, in the same manner as the scan Tetsupu SA2, after capturing the target voltage V M from the target voltage output unit 8 0, the process proceeds to step SB 3.
- step SB3 arithmetic section 100 determines whether or not carrier cycle count value n is 2.
- the carrier cycle count value n is a carrier cycle count value. In this case, assuming that carrier cycle count value n is 2, arithmetic unit 100 sets the determination result as “Yes” and proceeds to step SB4. In step SB4, the arithmetic unit 100 substitutes 1 for the carrier cycle count value n to initialize, and then proceeds to step SB5.
- step SB5 the arithmetic unit 100 acquires the instantaneous DC voltage VDCS in the same manner as in step SA3, and then proceeds to step SB6.
- step SB6 as in step SA4, computing unit 100 described above described reference voltage Vref from reference voltage setting unit 90 and instantaneous DC voltage VDCS taken in step SB5.
- the process proceeds to step SB7.
- step SB7 the arithmetic unit 100 calculates the target voltage V m fetched in step SB2 and the DC voltage correction coefficient A calculated in step SB6 in the same manner as in step SA5 (2 After calculating the correction target voltage V ma by substituting into the equation, the process proceeds to step SB8.
- step SB 8 the arithmetic unit 1 0 0 Step SA 6 in the same manner as the correction th instantaneous DC voltage captured at Step SB 5 the target voltage V RAA V DCS (two DC voltage V DC ) Is calculated as the PWM width, and the process proceeds to step SB9.
- step SB9 the arithmetic unit 100 generates a PWM switching pattern signal P corresponding to the PWM width.
- the arithmetic unit 100 outputs the PWM switching pattern signal P to the inverter unit 60, returns to step SB1, and repeats the above-described determination.
- the inverter section 60 When the above-mentioned PWM switching pattern signal P is input to the inverter section 60, the inverter section 60 turns on / off the switching element in accordance with the PWM switching pattern signal P in the same manner as the operation described above.
- the PWM control converts the DC voltage V DC to the output AC voltage V 0ut, supplying it to the compressor motor 70.
- the output AC average voltage VA 0ut AC output voltage V 0ut as in the case of the shape states first embodiment, without being affected by fluctuation of the DC voltage V DC due to fluctuations of the commercial AC voltage V AC Take a constant value.
- step SB 2 the arithmetic unit 1 0 0, like in step SA 2, after capturing the target voltage V m of the target voltage output unit 8 0 to, the process proceeds to step SB 3.
- step SB7 the arithmetic unit 100 calculates the target voltage V ra fetched in step SB2 and the DC voltage correction coefficient A calculated in the previous carrier cycle timing in the same manner as in step SA5. After calculating the correction target voltage V ma by substituting into the equation (2), the process proceeds to step SB8.
- step SB8 the arithmetic unit 100 calculates the PWM width in the same manner as in step SA6, and then proceeds to step SB9.
- step SB 9 the arithmetic unit 100 A PWM switching pattern signal P corresponding to the PWM width is generated.
- the arithmetic unit 100 outputs the PWM switching pattern signal P to the inverter unit 60, returns to step SB1, and repeats the above-described determination.
- step SB 2 the arithmetic unit 1 0 0, like in step SA 2, after capturing the target voltage V m of the target voltage output unit 8 0 to, the process proceeds to step SB 3.
- step SB3 since the carrier cycle count value n is 2, the calculation unit 100 sets the determination result to "Yes" and proceeds to step SB4.
- step SB4 the arithmetic unit 100 substitutes 1 for the carrier cycle count value n to perform initialization, and then proceeds to step SB5.
- step SB5 the arithmetic unit 100 acquires the instantaneous DC voltage VDCS in the same manner as in step SA3, and then proceeds to step SB6.
- the arithmetic unit 1 0 like in step SA 4, the reference voltage V ref from the reference electric pressure set tough 9 0, and the instantaneous DC voltage V DCS captured at Step SB 5 described above
- step SB7 That is, the DC voltage correction coefficient A is calculated every two carrier periods. Thereafter, the operations described above are repeated from step SA7.
- the DC voltage correction coefficient A is calculated every n carrier periods. Therefore, as in the first embodiment, the DC voltage correction coefficient A is calculated every one carrier period. Since the number of times of calculation of the DC voltage correction coefficient A per unit time is reduced as compared with the case of calculating, the correction can be realized by the low-speed and inexpensive calculation unit 100, and the cost is reduced. Can be reduced.
- the first and second embodiments according to the present invention have been described in detail with reference to the drawings. However, specific configuration examples are not limited to Embodiments 1 and 2, and the present invention includes any design changes that do not depart from the gist of the present invention.
- the square wave PWM method has been described as an example as shown in FIG. 8 (C), but the PWM method is applied to control of a motor or a compressor motor. Even when the sine wave approximation PWM method is adopted, the same effects as in the first and second embodiments can be obtained.
- the reference voltage setting unit 9 0 has been described an example of setting the reference voltage V rei corresponding to a commercial AC voltage V AC (FIG. 2 (A) ⁇ (C) reference), country, may be set the voltage corresponds to the region of the power supply circumstances (commercial AC voltage V AC is consistently low (or high)) as a reference voltage V ref.
- the desired output AC voltage is supplied to the AC load without being affected by the fluctuation of the commercial AC voltage, so that the load characteristics and efficiency are optimized. This has the effect that the AC load can be operated in a proper state.
- the correction unit corrects the pulse width based on the result of multiplying the ratio of the detection result of the instantaneous DC voltage detection unit to the reference voltage by the target voltage. Since a desired value of the output AC voltage is supplied to the AC load without being affected by the fluctuation of the AC load, it is possible to operate the AC load with the load characteristics and the efficiency being optimized.
- the reference voltage is changed according to the commercial AC voltage by the setting changing means, the desired value can be output even in countries and regions where power supply conditions (rated value and stability of the commercial AC voltage) are different. Since the AC voltage can be supplied to the AC load, there is an effect that the AC load can be operated in an optimal state regardless of the country or region.
- the ratio (reference voltage Z detection result of instantaneous DC voltage detection means) is calculated every n cycles of the modulated carrier, so the unit time is shorter than when the ratio is calculated every cycle. Since the number of times of calculation of the ratio per unit is reduced and the correction can be realized by an inexpensive arithmetic circuit, it is possible to reduce the cost.
- the inverter control device is useful for air conditioners used in countries and regions where power supply conditions (rated value and stability of commercial AC voltage) are different.
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- Inverter Devices (AREA)
- Control Of Ac Motors In General (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP99974240A EP1152521A4 (en) | 1999-11-29 | 1999-11-29 | INVERTER CONTROL CIRCUIT |
AU14111/00A AU755537B2 (en) | 1999-11-29 | 1999-11-29 | Inverter controller |
CN99815927A CN1334985A (zh) | 1999-11-29 | 1999-11-29 | 逆变器控制装置 |
PCT/JP1999/006643 WO2001041291A1 (en) | 1999-11-29 | 1999-11-29 | Inverter controller |
US09/863,314 US6687139B2 (en) | 1999-11-29 | 2001-05-24 | Inverter control apparatus |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP1999/006643 WO2001041291A1 (en) | 1999-11-29 | 1999-11-29 | Inverter controller |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/863,314 Continuation US6687139B2 (en) | 1999-11-29 | 2001-05-24 | Inverter control apparatus |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2001041291A1 true WO2001041291A1 (en) | 2001-06-07 |
WO2001041291A8 WO2001041291A8 (en) | 2001-09-27 |
Family
ID=14237413
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP1999/006643 WO2001041291A1 (en) | 1999-11-29 | 1999-11-29 | Inverter controller |
Country Status (5)
Country | Link |
---|---|
US (1) | US6687139B2 (ja) |
EP (1) | EP1152521A4 (ja) |
CN (1) | CN1334985A (ja) |
AU (1) | AU755537B2 (ja) |
WO (1) | WO2001041291A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
WO2001041291A8 (en) | 2001-09-27 |
AU755537B2 (en) | 2002-12-12 |
EP1152521A1 (en) | 2001-11-07 |
AU1411100A (en) | 2001-06-12 |
EP1152521A4 (en) | 2004-09-01 |
US20010036093A1 (en) | 2001-11-01 |
US6687139B2 (en) | 2004-02-03 |
CN1334985A (zh) | 2002-02-06 |
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