WO2022172417A1 - 電力変換装置、モータ駆動装置及び冷凍サイクル適用機器 - Google Patents
電力変換装置、モータ駆動装置及び冷凍サイクル適用機器 Download PDFInfo
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- WO2022172417A1 WO2022172417A1 PCT/JP2021/005357 JP2021005357W WO2022172417A1 WO 2022172417 A1 WO2022172417 A1 WO 2022172417A1 JP 2021005357 W JP2021005357 W JP 2021005357W WO 2022172417 A1 WO2022172417 A1 WO 2022172417A1
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- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
-
- 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
- H02M1/14—Arrangements for reducing ripples from dc input or output
- H02M1/143—Arrangements for reducing ripples from dc input or output using compensating arrangements
-
- 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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4225—Arrangements for improving power factor of AC input using a non-isolated boost converter
-
- 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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
- H02M1/4233—Arrangements for improving power factor of AC input using a bridge converter comprising active switches
-
- 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
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/24—Vector control not involving the use of rotor position or rotor speed sensors
- H02P21/28—Stator flux based control
- H02P21/30—Direct torque control [DTC] or field acceleration method [FAM]
-
- 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
-
- 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
-
- 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
- H02P2201/00—Indexing scheme relating to controlling arrangements characterised by the converter used
- H02P2201/07—DC-DC step-up or step-down converter inserted between the power supply and the inverter supplying the motor, e.g. to control voltage source fluctuations, to vary the motor speed
Definitions
- the present disclosure relates to a power conversion device, a motor drive device, and a refrigeration cycle application device that convert AC power into desired power.
- a power conversion device that converts AC power supplied from an AC power supply into desired AC power and supplies it to a load such as an air conditioner.
- a power conversion device which is a control device for an air conditioner, rectifies AC power supplied from an AC power supply with a diode stack, which is a converter, and further smoothes the power with a smoothing unit.
- a technology is disclosed in which the AC power is converted into a desired AC power by an inverter composed of switching elements and output to a compressor motor, which is a load.
- Patent Document 1 has the problem that a large current flows through the smoothing portion, which accelerates aging deterioration of the smoothing portion and shortens the life of the capacitor.
- the prior art including Patent Document 1 has a device configuration in which a plurality of devices are driven by one converter and a plurality of inverters connected to one converter, such as an air conditioner. There is no idea of extending the life of the capacitor by utilizing it.
- the present disclosure has been made in view of the above, and uses a device configuration in which a plurality of devices are driven by a single converter and a plurality of inverters connected to the converter to extend the life of the smoothing section. It is an object of the present invention to obtain a power conversion device capable of
- the power conversion device includes a converter, a smoothing section connected to the output end of the converter, and a first inverter connected to the output end of the converter. , a second inverter connected in parallel to the first inverter, and a controller.
- the converter rectifies a power supply voltage applied from an alternating current power supply and, if necessary, boosts the power supply voltage.
- the first inverter converts the power output from the converter and the smoothing section into first AC power, and outputs the first AC power to the first device equipped with the first motor.
- the second inverter converts the power output from the converter and the smoothing section into second AC power, and outputs the second AC power to the second device equipped with the second motor.
- the control unit controls the operation of the converter, the first inverter, or the second inverter to suppress the current flowing through the smoothing unit, and operates the second load unit including the second inverter and the second device.
- the operation of the first inverter is controlled according to the state.
- the power conversion device utilizes a device configuration in which a plurality of devices are driven by one converter and a plurality of inverters connected to the converter, and the effect that the life of the smoothing section can be extended. play.
- FIG. 1 is a diagram for explaining the basic configuration and basic functions of a power conversion device according to Embodiment 1;
- FIG. 2 is a diagram showing still another configuration example having the basic functions of the power converter shown in FIG. 1;
- FIG. 2 is a diagram showing an operation mode and an overview of the operation mode according to the first embodiment;
- FIG. 4 is a diagram for explaining power supply ripple compensation control according to Embodiment 1.
- FIG. FIG. 5 is a diagram showing operation waveforms of respective parts as a comparative example in comparison with FIG. 1 is a diagram showing a configuration example of a power converter according to Embodiment 1;
- FIG. 2 is a diagram showing a first configuration example that implements the power converter according to Embodiment 1;
- FIG. 4 is a diagram for explaining a pulsating current correction method according to the first embodiment;
- FIG. 4 shows a second configuration example that implements the power converter according to Embodiment 1;
- 1 is a block diagram showing an example of a hardware configuration realizing functions of a control unit according to Embodiment 1;
- FIG. FIG. 4 is a block diagram showing another example of a hardware configuration that implements the functions of the control unit according to Embodiment 1;
- FIG. 1 is a diagram for explaining the basic configuration and basic functions of a power converter according to Embodiment 1.
- the power converter 1 is connected to a commercial power source 110 and a compressor 315 .
- the commercial power supply 110 is an example of an AC power supply
- the compressor 315 is an example of the equipment referred to in the first embodiment.
- a motor 314 is mounted on the compressor 315 .
- a motor drive device 2 is configured by the power conversion device 1 and the motor 314 included in the compressor 315 .
- the power converter 1 includes a rectifying section 130, a boosting section 600, a current detecting section 501, a smoothing section 200, a current detecting section 502, an inverter 310, current detecting sections 313a and 313b, a control section 400, Prepare.
- converter 700 is configured by rectifying section 130 and boosting section 600 .
- the rectifying section 130 has a bridge circuit composed of rectifying elements 131-134. Rectifying section 130 rectifies the power supply voltage applied from commercial power supply 110 and outputs the rectified power supply voltage to boosting section 600 .
- the rectifier 130 configured in FIG. 1 performs full-wave rectification.
- the booster section 600 has a reactor 631 , a switching element 632 and a diode 633 .
- the switching element 632 is controlled to be on or off by the control signal output from the control section 400 .
- the rectified voltage is short-circuited via reactor 631 . This operation is called “power supply short-circuit operation”.
- switching element 632 is turned off, the rectified voltage is applied to smoothing section 200 via reactor 631 . This operation is normal commutation operation. At this time, if energy is stored in reactor 631 , the output voltage of rectifying section 130 and the voltage generated in reactor 631 are added together and applied to smoothing section 200 .
- the step-up unit 600 steps up the rectified voltage by alternately repeating the power supply short-circuit operation and the rectification operation. This operation is called a "boost operation".
- the boost operation improves the power factor of the current flowing between commercial power supply 110 and converter 700 .
- switching element 632 is always off, the voltage output from rectifying section 130 is output without being boosted.
- the converter 700 rectifies the power supply voltage applied from the commercial power supply 110 and, if necessary, boosts the power supply voltage.
- the smoothing section 200 has a capacitor 210 .
- Smoothing section 200 is connected to the output terminal of converter 700 .
- Capacitor 210 smoothes the rectified voltage output from converter 700 . Examples of the capacitor 210 include an electrolytic capacitor, a film capacitor, and the like.
- the voltage generated in the capacitor 210 does not have the full-wave rectified waveform of the commercial power supply 110, but has a waveform in which voltage ripple corresponding to the frequency of the commercial power supply 110 is superimposed on the DC component, but does not pulsate significantly.
- the commercial power supply 110 is a single-phase power supply
- the main frequency of this voltage ripple is a component twice the frequency of the power supply voltage. If the power input from commercial power supply 110 and the power output from inverter 310 do not change, the amplitude of this voltage ripple is determined by the capacitance of capacitor 210 .
- an increase in capacitance is avoided in order to suppress an increase in cost of the capacitor 210 .
- a certain amount of voltage ripple is generated in the capacitor 210 .
- the voltage across capacitor 210 is a pulsating voltage in a range such that the maximum value of the voltage ripple is less than twice the minimum value.
- Current detection section 501 detects converter current I1, which is a current that flows into and out of converter 700, and outputs the detected current value to control section 400.
- Current detection unit 502 also detects inverter current I ⁇ b>2 that flows in and out of inverter 310 and outputs the detected current value to control unit 400 .
- the inverter 310 is connected to the output terminal of the converter 700 .
- the inverter 310 has switching elements 311a-311f and freewheeling diodes 312a-312f.
- the inverter 310 turns on and off the switching elements 311a to 311f under the control of the control unit 400, converts the power output from the converter 700 and the smoothing unit 200 into AC power having a desired amplitude and phase, and the motor 314 is mounted. It outputs to the compressor 315, which is a device that
- the current detection units 313 a and 313 b each detect one-phase current out of the three-phase currents output from the inverter 310 .
- Each detection value of the current detection units 313 a and 313 b is input to the control unit 400 .
- the control unit 400 calculates the current of the remaining one phase based on the detected value of the current of any two phases detected by the current detection units 313a and 313b.
- Control unit 400 uses the current detection values detected by current detection units 501 and 502 and current detection units 313a and 313b to control the operation of boost unit 600 in converter 700, specifically, the operation of boost unit 600. It controls on/off of the switching element 632 . Further, the control unit 400 controls the operation of the inverter 310, specifically, ON/OFF of the switching elements 311a to 311f included in the inverter 310, using the detection values detected by the respective detection units.
- a motor 314 mounted on the compressor 315 rotates according to the amplitude and phase of the AC power supplied from the inverter 310 to perform compression operation.
- the compressor 315 is a hermetic compressor used in an air conditioner or the like, the load torque of the compressor 315 can often be regarded as a constant torque load.
- FIG. 1 shows a case where the motor windings in the motor 314 are Y-connected
- the present invention is not limited to this example.
- the motor windings of the motor 314 may be delta-connection, or may be switchable between Y-connection and delta-connection.
- FIG. 2 is a diagram showing another configuration example having the basic functions of the power converter shown in FIG.
- FIG. 1 the converter 700 shown in FIG. 1 is replaced with a converter 701.
- FIG. Converter 701 is a component having both a rectifying function and a boosting function, similar to converter 700 shown in FIG.
- the converter 701 has a reactor 710, switching elements 611-614, and rectifying elements 621-624 each connected in parallel to one of the switching elements 611-614.
- Other configurations are the same as or equivalent to those of the power converter 1 shown in FIG. 1, and the same or equivalent components are denoted by the same reference numerals.
- reactor 710 of this configuration is inserted only in one-sided connection line between commercial power supply 110 and converter 701, it may be inserted in both-sided connection lines.
- converter 701 the switching elements 611 to 614 are controlled to be on or off by the control signal output from the control section 400.
- Converter 701 alternately repeats power supply short-circuit operation and rectification operation. As a result, converter 701 rectifies the power supply voltage applied from commercial power supply 110 and, if necessary, boosts the rectified voltage. By the boosting operation, the voltage across the smoothing unit 200 is boosted to a voltage higher than the power supply voltage. In addition, the step-up operation improves the power factor of the current flowing between commercial power supply 110 and converter 701 .
- the power converter 1 shown in FIG. 2 has the same basic functions as the power converter 1 shown in FIG. Therefore, it can be applied to a power conversion device 1A, which will be described later.
- FIG. 3 is a diagram showing still another configuration example having the basic functions of the power converter shown in FIG.
- converter 700 shown in FIG. 1 is replaced with a converter 702.
- booster section 600 is replaced with booster section 601 and reactor 710 .
- Reactor 710 is arranged between commercial power supply 110 and rectifying section 130 .
- Converter 702 is a component having both a rectifying function and a boosting function, similar to converter 700 shown in FIG.
- the boosting section 601 has rectifying elements 621 to 624 and a switching element 615 .
- the boosting section 601 is connected in parallel with the rectifying section 130 .
- Other configurations are the same as or equivalent to those of the power converter 1 shown in FIG. 1, and the same or equivalent components are denoted by the same reference numerals.
- the switching element 615 is controlled to be on or off by the control signal output from the control section 400 .
- the boosting unit 601 performs a power supply short-circuit operation.
- the rectifying section 130 performs a rectifying operation.
- Converter 702 alternately repeats power short-circuit operation and rectification operation. As a result, converter 702 rectifies the power supply voltage applied from commercial power supply 110 and, if necessary, boosts the rectified voltage.
- the boosting operation the voltage across the smoothing unit 200 is boosted to a voltage higher than the power supply voltage.
- the step-up operation improves the power factor of the current flowing between commercial power supply 110 and converter 702 .
- the power converter 1 shown in FIG. 3 has the same basic functions as the power converter 1 shown in FIG. Therefore, it can be applied to a power conversion device 1A, which will be described later.
- the power converter 1 shown in FIG. 1 will be used as an example.
- the current detection units 501, 502, 313a, and 313b may be collectively referred to as a detection unit.
- the current values detected by the current detection units 501, 502, 313a, and 313b may be referred to as detection values.
- the power electronics device 1 may include a detector other than the detector described above. Although omitted in FIG. 1, the power conversion device 1 generally includes a detection unit that detects the capacitor voltage.
- the power conversion device 1 may include a detection unit that detects the voltage, current, etc. of the AC power supplied from the commercial power source 110 .
- FIG. 4 is a diagram showing operation modes and outlines of the operation modes according to the first embodiment.
- the boost control is a control in which the booster 600 boosts the power supply voltage applied from the commercial power supply 110 in order to ensure the drive range of the motor 314 due to high rotation.
- the control unit 400 controls on/off of the switching element 632 of the boosting unit 600 .
- Vibration suppression control suppresses vibration by adjusting the torque applied from inverter 310 to the torque pulsation when vibration occurs due to torque pulsation caused by a mechanical mechanism such as compressor 315 during one rotation of motor 314. Control.
- Constant torque control is control that keeps the torque applied from the inverter 310 to the motor 314 constant and reduces load current pulsation. Constant torque control is also called constant current control. Even in a system having torque pulsation, the amount of vibration is not so large when operating in a relatively light load region. Therefore, by keeping the torque given from the inverter 310 constant, the current waveform of the motor 314 becomes a sinusoidal waveform, ie, a waveform without pulsation, and high-efficiency operation can be achieved. Constant torque control can be used when vibration is acceptable even in the high load region.
- Power supply ripple compensation control is control for suppressing the ripple component of the smoothing section current I3, which is the current flowing through the smoothing section 200 .
- Ripple current caused by power supply pulsation passes through the capacitor 210 of the smoothing section 200 and transmits power to the load section including the inverter 310 and the compressor 315, thereby reducing the stress on the capacitor 210.
- FIG. Details of the power supply ripple compensation control will be described later.
- the power converter 1 according to Embodiment 1 has 12 operation modes, as shown in FIG. These operation modes 1 to 12 are determined by each combination of presence/absence of boost control, presence/absence of vibration suppression control, presence/absence of constant torque control, and presence/absence of power supply ripple compensation control.
- Control unit 400 determines whether or not each control shown in FIG. That is, the control unit 400 determines the presence or absence of each control according to the operation state of the load unit, and maintains or switches the operation mode.
- four items are listed as specific contents of the operation mode, but these are only examples and are not limited to these. Some of the four items may be controlled, or items other than the four items may be controlled. Items other than the four items include, for example, flux-weakening control and overmodulation control.
- the flux-weakening control is a control that widens the high rotation range of the motor 314 by applying a negative d-axis current to the motor 314 to reduce the apparent electromotive force.
- Overmodulation control is control in which a voltage greater than the electromotive force of the motor 314 is supplied from the inverter 310 to the motor 314 in order to drive the motor 314 .
- the power converter 1 has a limited supply voltage. Therefore, when the motor 314 rotates at high speed, the electromotive force of the motor 314 becomes larger than the supply voltage, making it difficult to continue the rotation. Therefore, the power conversion device 1 distorts the output voltage from the inverter 310, specifically by including the third harmonic component, thereby raising the fundamental wave component of the output voltage a little. As a result, the power conversion device 1 can increase the high rotation region of the motor 314 .
- FIG. 4 does not describe the power factor improvement control of the AC power supplied from the commercial power supply 110 and the average voltage control of the capacitor 210 of the smoothing section 200, but these controls are performed regardless of the operation mode.
- the power converter 1 can detect the converter current I1 based on the current value, for example, the value detected by the current detection unit 501, and the inverter current I2 based on the value detected by the current detection unit 502.
- the power conversion device 1 determines the operating state of the power conversion device 1 based on the temperature, for example, the detection value of the temperature sensor of the indoor unit provided in the air conditioner, the detection value of the temperature sensor of the outdoor unit, etc. when installed in the air conditioner. can be detected.
- the power conversion device 1 may include a temperature sensor around the substrate of the inverter 310 to detect the temperature around the substrate of the inverter 310 , or may include a temperature sensor around the motor 314 to detect the temperature around the motor 314 . may be detected.
- the power conversion device 1 generates the operating speed, for example, the operating speed of the motor 314 of the compressor 315 and the fan (not shown) mounted on the air conditioner in the process of control by the control unit 400. It can be directly or indirectly detected from a command value to be applied, or an estimated value estimated from the operating frequency in the process of control by the control unit 400 .
- the operation state of the power conversion device 1 is determined by the detection value of the detection unit that detects the physical quantity of the inverter 310, the motor 314, or the compressor 315, and the command generated in the control process of the control unit 400. value, and an estimated value estimated in the process of control of the control unit 400.
- the physical quantity may be, for example, a voltage value in addition to the aforementioned current value, temperature, and operating speed.
- the load generated by the inverter 310 and the compressor 315 can be regarded as a constant load. Also, when viewed from the current output from the smoothing section 200 , it is assumed that a constant current load is connected to the smoothing section 200 .
- the smoothing portion current I3 the direction in which it flows out from the smoothing portion 200, that is, the discharge direction is defined as positive, as indicated by the arrow in FIG.
- the control unit 400 can calculate the smoothing unit current I3 using the detected values of the converter current I1 and the inverter current I2.
- FIG. 5 is a diagram for explaining the power supply ripple compensation control according to the first embodiment.
- FIG. 5 shows an operation waveform example of each part when the control part 400 of the power converter 1 according to Embodiment 1 controls the operation of the inverter 310 to reduce the smoothing part current I3.
- the converter current I1, the inverter current I2, the smoothing part current I3, and the capacitor voltage Vdc which is the voltage of the capacitor 210 generated according to the smoothing part current I3, are shown in order from the top.
- the horizontal axes all represent time t
- the vertical axes of converter current I1, inverter current I2, and smoothing section current I3 represent current values
- the vertical axis of capacitor voltage Vdc represents voltage values.
- FIG. 6 is a diagram showing operation waveforms of respective parts as a comparative example in comparison with FIG.
- FIG. 6 shows an example of waveforms at each part when inverter current I2 is kept constant when smoothing the current output from converter 700 in smoothing part 200 .
- the converter current I1, the inverter current I2, the smoothing section current I3, and the capacitor voltage Vdc are shown in order from the top.
- the scales of the physical quantities represented by the horizontal and vertical axes are the same as in FIG.
- the converter current I1 flowing from the boosting section 600 is sufficiently smoothed by the smoothing section 200.
- the inverter current I2 has a constant current value as shown in FIG.
- a large pulsating component flows in the smoothing section current I3 as shown in FIG.
- the control unit 400 controls the operation of the inverter 310 so that the pulsating component of the smoothing unit current I3 is reduced. Specifically, control unit 400 controls the operation of inverter 310 such that inverter current I2 shown in FIG. Compared with the example of FIG. 6, the pulsating component of the smoothing section current I3 is reduced. Under the control of control unit 400, inverter current I2 includes a component current including a pulsating current whose main component is the frequency component of converter current I1. As a result, the pulsating current that attempts to flow from converter 700 into smoothing section 200 is reduced, and the pulsating current I3 of smoothing section is reduced.
- the frequency component of the converter current I1 is determined by the frequency of the alternating current supplied from the commercial power supply 110, the configuration of the rectifying section 130, and the switching speed of the switching element 632 of the boosting section 600. Therefore, the control unit 400 can make the frequency component of the pulsating current superimposed on the inverter current I2 a component having a predetermined amplitude and phase.
- the frequency component of the pulsating current superimposed on the inverter current I2 has a waveform similar to that of the converter current I1.
- Control unit 400 can reduce the pulsating component of smoothing unit current I3 as the frequency component of the pulsating current superimposed on inverter current I2 approaches the frequency component of converter current I1. At this time, it is also possible to reduce the pulsating voltage generated in the capacitor voltage Vdc.
- Controlling the pulsation of the current flowing through the inverter 310 by controlling the operation of the inverter 310 by the control unit 400 is equivalent to controlling the pulsation of the AC power supplied from the inverter 310 to the compressor 315 .
- Control unit 400 controls the operation of inverter 310 such that the pulsation contained in the AC power output from inverter 310 is smaller than the pulsation of the power output from converter 700 .
- control unit 400 may determine the frequency component of the pulsating current superimposed on the inverter current I2 according to the AC power supplied from the commercial power supply 110. Specifically, when the AC power supplied from commercial power supply 110 is single-phase, control unit 400 converts the pulsating waveform of inverter current I2 into a pulsating waveform whose main component is a frequency component that is twice the frequency of the AC power. Control to a shape in which a DC component is added. Further, when the AC power supplied from the commercial power supply 110 is three-phase, the control unit 400 divides the pulsating waveform of the inverter current I2 into a pulsating waveform whose main component is a frequency component six times the frequency of the AC power.
- the pulsation waveform is, for example, the shape of the absolute value of a sine wave or the shape of a sine wave.
- the control unit 400 may add at least one frequency component of integral multiples of the sine wave frequency to the pulsating waveform as a predetermined amplitude.
- the pulsating waveform may be in the shape of a rectangular wave or in the shape of a triangular wave. In this case, the control unit 400 may set the amplitude and phase of the pulsation waveform to predetermined values.
- control unit 400 can calculate the pulsation amount of the pulsation included in the inverter current I2 using the smoothing unit current I3 obtained by calculation.
- control unit 400 may use capacitor voltage Vdc or the voltage or current of AC power supplied from commercial power supply 110 to calculate the amount of pulsation included in inverter current I2.
- control unit 400 controls inverter 310 to compress the AC power from inverter 310 .
- the frequency component included in the AC power output to the booster 315 may be superimposed on the drive signal for turning on/off the switching element 632 of the booster 600 .
- converter 700 is configured to output power including fluctuating frequency components other than frequency components twice the frequency of the AC power. controls the behavior of Further, when the AC power supplied from commercial power supply 110 is three-phase, converter 700 operates so that converter 700 outputs power including fluctuating frequency components other than frequency components six times the frequency of the AC power. to control.
- FIG. 7 is a diagram illustrating a configuration example of a power converter according to Embodiment 1.
- FIG. A power converter 1A shown in FIG. 7 is configured to be able to use the basic functions of the power converter 1 shown in FIG.
- symbol is attached
- the power converter 1A includes a converter 700, a smoothing section 200, current detection sections 501 and 502, an inverter 310a as a first inverter, and a second inverter and an inverter 310b and a control unit 400.
- Converter 700 is connected to commercial power source 110 .
- a device 315a which is the first device, is equipped with a motor 314a, which is the first motor.
- One example of device 315a is a compressor, and another example of device 315a is a fan.
- Inverter 310a is connected to motor 314a of device 315a.
- the device 315b which is the second device, is equipped with the motor 314b, which is the second motor.
- One example of device 315b is a fan, and another example of device 315b is a compressor.
- Inverter 310b is connected to motor 314b of appliance 315b.
- a motor drive device 2A is configured by the power conversion device 1A, the motor 314a included in the device 315a, and the motor 314b included in the device 315b. Note that FIG. 7 omits illustration of components equivalent to the current detection units 313a and 313b shown in FIG.
- the power conversion device 1A is configured such that one converter 700 has an inverter 310a and an inverter 310b connected in parallel. That is, the inverter 310a is connected in parallel to the inverter 310b with respect to the converter 700.
- FIG. Inverter 310 b is connected in parallel to inverter 310 a with respect to converter 700 .
- inverter 310a converts the power output from converter 700 and smoothing section 200 into first AC power, and outputs the first AC power to device 315a on which motor 314a is mounted.
- inverter 310b converts the power output from converter 700 and smoothing section 200 into second AC power, and outputs the second AC power to device 315b on which motor 314b is mounted.
- the converter 700, the smoothing section 200, and the control section 400 can be shared, so that the cost increase of the device can be suppressed and the device can be simplified.
- FIG. 8 is a diagram showing a first configuration example that implements the power converter according to the first embodiment.
- the same reference numerals are given to the same or equivalent components as the components shown in FIG. 1 or FIG.
- FIG. 8 shows, as circuit elements, a power source section 850, a boost section 600, a smoothing section 200, current detection sections 501 and 502, a load section 800a as a first load section, and a second load section.
- a load section 800b is shown.
- the power supply unit 850 includes the commercial power supply 110 and the rectification unit 130 as components.
- Load section 800a includes, in addition to constant current load section 810a, pulsating load compensating section 820a and power source pulsating compensating section 830a.
- the load section 800b includes only a constant current load section 810b as a component.
- FIG. 8 is a configuration diagram assuming that the power converter 1A is applied to an air conditioner. The same applies to the drawings of FIGS. 10 to 13 to be described later. Specifically, in FIG. 8, the constant current load section 810a assumes a compressor motor load, and the constant current load section 810b assumes a fan motor load.
- FIGS. 5 and 6 it is assumed that a constant current load is connected to the smoothing section 200.
- FIG. it is also known that some types of compressors have a mechanism that causes periodic rotation fluctuations.
- inverter 310 outputs a constant current, but in vibration suppression control, a pulsating current component corresponding to vibration suppression torque is supplied to the load in addition to the constant current.
- the element that causes this pulsating current component to flow can be represented by adding a pulsating load compensator 820a to the constant current load unit 810a.
- the pulsating current component due to the power supply ripple compensation control is applied to the load.
- the element that causes this pulsating current component to flow can be represented by adding a power supply pulsating compensator 830a.
- load unit 800b is not provided with a pulsating load compensating unit and a power supply pulsating compensating unit. This means that vibration suppression control and power supply ripple compensation control are not performed in load section 800b.
- the operation of the power converter 1A for extending the life of the capacitor 210 will be described.
- the converter current I1 corresponds to the rectified current after boosting.
- I2a represents a current of the inverter current I2 that is diverted to the load section 800a
- I2b represents a current of the inverter current I2 that is diverted to the load section 800b.
- shunt current both are called "shunt current”.
- the content of the control for setting the pulsating portion of the smoothing portion current I3 to zero will be described. , it is not always necessary to make the pulsating portion of the smoothing portion current I3 zero.
- the power converter 1A according to Embodiment 1 has the function of power supply ripple compensation control. The following controls are performed using this function.
- current difference ⁇ I3 ⁇ I1 ⁇ (I2a+I2b) ⁇ flows into capacitor 210 in the phase of the power supply voltage where the relationship of I1>(I2a+I2b) holds.
- current difference ⁇ I3 ⁇ (I2a+I2b) ⁇ I1 ⁇ flows out from smoothing unit 200.
- a pulsating current is generated in power supply pulsating compensator 830a, and shunt current I2a is adjusted according to changes in converter current I1.
- a change in converter current I1 can be detected based on the value detected by current detection unit 501 .
- the current difference ⁇ I3 can be brought close to zero, so that the amount of current flowing into and out of the smoothing section 200 can be reduced.
- the outflow and inflow amounts of the smoothing portion current I3 can be reduced, the stress on the capacitor element can be suppressed, and aging deterioration of the capacitor element can be suppressed. Thereby, extension of the life of the capacitor 210 can be achieved.
- the capacitance of the capacitor element can be reduced by the amount of current inflow and the amount of current outflow suppressed by this control, and the ripple resistance of the capacitor element is relaxed. As a result, since an inexpensive capacitor element can be used, an increase in the cost of the device can be suppressed.
- the voltage before boosting ie, the rectified voltage
- the boosted voltage which is the voltage after boosting
- step-up control is performed on the input power determined by the three elements of the rectified voltage Vs, the rectified current I0, and the power supply power factor, and the stepped-up voltage Vb and the converter current I1 are output. Since the voltage after boosting generally satisfies Vs ⁇ Vb, the characteristic of I1 ⁇ I0 is obtained.
- the load section 800a assumes the compressor motor load
- the load section 800b assumes the fan motor load
- the shunt current I2a includes not only the current used in the constant current load section 810a, which is assumed to drive a constant torque load, but also the compensation current used in the ripple load compensation section 820a and the compensation current used in the power supply ripple compensation section 830a.
- the current value of the converter current I1 can be detected by the current detection unit 501 .
- the load section 800b with the fan motor load is performing a deceleration operation.
- the electromotive force generated in the load section 800b there occurs a period during which the inverter output voltage in the load section 800b becomes small.
- load section 800b is in a regenerative state, and power is not consumed in load section 800b.
- the shunt current I2b ⁇ 0 a current flows into the smoothing section 200 . Therefore, a ripple current is generated in the power supply ripple compensator 830a, and the shunt current I2a is adjusted according to the change in the shunt current I2b.
- the current difference ⁇ I3 can be brought close to zero, so that the amount of current flowing into and out of the smoothing section 200 can be reduced.
- the current detection unit 502 detects the inverter current I2 and cannot directly detect the shunt current I2b. Since the change component of the inverter current I2 also includes the change component of the shunt current I2a, there may be cases where the change of the shunt current I2b cannot be detected with high accuracy. Therefore, a method for correcting the pulsating current generated in power supply pulsating compensator 830a is proposed.
- FIG. 9 is a diagram for explaining the pulsating current correction method according to the first embodiment.
- the horizontal axis of FIG. 9 represents the rotation speed, and the vertical axis represents the correction value of the pulsating current generated in the power supply pulsating compensator 830a.
- Correction of pulsating current is required when the rotational speed is high. Therefore, as shown in FIG. 9, correction is not performed when the rotation speed is equal to or lower than the first rotation speed f1, and the pulsating current is corrected when the rotation speed exceeds the first rotation speed f1.
- the approach of FIG. 9 does not require direct sensing of changes in the shunt current I2b. Therefore, a detector for detecting the shunt current I2b is not required. Therefore, if the method of FIG. 9 is used, the simplification of the device can be achieved while suppressing an increase in the cost of the device.
- the change in the correction value ⁇ I of the pulsating current that is changed according to the rotation speed is represented by a straight line, but it is not limited to this. That is, the relationship between the rotation speed and the correction value ⁇ I of the pulsating current does not need to be a linear relationship, and may be represented by a higher-order function of a quadratic function or higher.
- the pulsating current may be corrected based on the ambient temperature of the smoothing section 200 or the ambient temperature of the inverters 310a and 310b.
- the correction may be performed in all temperature ranges, or may be performed only in the high temperature range by a method similar to that shown in FIG.
- both the correction based on the rotation speed and the correction based on the ambient temperature may be performed.
- the load section 800a including the compressor motor load is a load having torque pulsation caused by a mechanical mechanism, acceleration and deceleration are performed during one rotation of the compressor, and the regeneration state is instantaneous.
- the shunt current I2a ⁇ 0 a current flows into the smoothing section 200 . Therefore, when the load section 800a is in a regenerative state, a pulsating current is generated in the power supply pulsating compensating section 830a to flow into the shunt current I2a.
- an increase in current difference ⁇ I3 can be suppressed.
- converter 700 is provided with boosting section 600. Therefore, by utilizing the boosting operation of boosting section 600, the outflow amount of smoothing section current I3 is and inflow can be reduced. Further, according to the power conversion device 1A according to Embodiment 1, since the load units connected in parallel to each other are provided at the output end of the converter 700, by effectively utilizing the regenerative state of the load units, It is possible to reduce the outflow and inflow of the smoothing section current I3. As a result, the stress on the capacitor element can be suppressed, and the aging deterioration of the capacitor element can be suppressed, so that the life of the capacitor 210 can be extended. In addition, since the capacity of the capacitor element can be reduced and the ripple resistance of the capacitor element is alleviated, an inexpensive capacitor element can be used. As a result, an increase in the cost of the device can be suppressed.
- FIG. 8 illustrates a configuration in which one load section 800a and one load section 800b are connected in parallel to the output end of converter 700
- the first load section, load section 800a may be a first load group comprising two or more load sections connected in parallel with each other.
- the second load section, load section 800b may also be a second load group comprising two or more load sections connected in parallel with each other.
- the load section 800a is referred to as the first load section, and the load section 800b is referred to as the second load section.
- 800a may be referred to as a second load section and load section 800b may be referred to as a first load section.
- FIG. 10 is a diagram showing a second configuration example that implements the power converter according to the first embodiment.
- the same reference numerals are assigned to the same or equivalent components as those shown in FIG.
- the inverters 310a and 310b are connected in parallel to one smoothing unit 200.
- a smoothing section 200a which is a first smoothing section
- a smoothing section 200b which is a second smoothing section
- the smoothing section 200a and the smoothing section 200b are connected in parallel to one converter 700.
- a current detection unit 501a for detecting the shunt current I1a and a current detection unit 501a for detecting the inverter current I2a are provided on the side of the load unit 800a.
- a current detection unit 502a is provided.
- the load section 800b is provided with a current detection section 501b for detecting the shunt current I1b and a current detection section 502b for detecting the inverter current I2b.
- Diverted current I1a represents the current of converter current I1 that is diverted to load section 800a.
- a shunt current I1b represents a current of the converter current I1 shunted to the load section 800b.
- the magnitude of the smoothing section current I3a flowing in and out of the smoothing section 200a can be represented by
- the magnitude of the smoothing section current I3b flowing in and out of the smoothing section 200b can be represented by
- a current detection unit 501a capable of directly detecting the shunted current I1a
- a current detecting unit 502a capable of directly detecting the inverter current I2a
- a current detecting unit 501b capable of directly detecting the shunt current I1b
- a current detection unit 502b that can directly detect the inverter current I2b.
- the current detection units 502a and 502b can directly detect the inverter currents I2a and I2b, respectively. As a result, it is possible to instantaneously determine the regenerative state, so it is possible to accurately determine whether or not the operating state of the load section 800a is in the regenerative state.
- FIG. 11 is a diagram showing a third configuration example that implements the power converter according to the first embodiment.
- FIG. 11 the same reference numerals are given to the same or equivalent components as those shown in FIG.
- the current detection units 501a and 501b shown in FIG. 10 are shared, and the current detection unit 501 is provided on the booster unit 600 side of the connection point between the booster unit 600 and the smoothing unit 200b.
- This configuration is effective when the current ratio between the current flowing into and out of the load section 800a and the current flowing into and out of the load section 800b can be grasped in advance. If this current ratio is known in advance, the shunt currents I1a and I1b can be calculated based on the detection value of the current detection unit 501 that detects the converter current I1. As a result, the current detection section can be simplified while obtaining the effect of the second configuration example shown in FIG.
- FIG. 12 is a diagram showing a fourth configuration example that implements the power converter according to the first embodiment.
- FIG. 12 the same reference numerals are given to the same or equivalent components as those shown in FIG.
- constant current load units 810a and 810b are both assumed to be compressor motor loads.
- FIG. 12 shows, as circuit elements, a power source section 850, a boost section 600, a smoothing section 200, current detection sections 501 and 502, and load sections 800a and 800b.
- the load section 800a includes a constant current load section 810a, a ripple load compensator 820a, and a power supply ripple compensator 830a as components.
- the load section 800b similarly includes a constant current load section 810b, a ripple load compensator 820b, and a power supply ripple compensator 830b.
- the difference from FIG. 8 is that the load section 800b includes a ripple load compensation section 820b and a power supply ripple compensation section 830b as components.
- both load sections 800a and 800b with compressor motor loads are performing deceleration operations.
- the electromotive force generated in load section 800a there occurs a period during which the inverter output voltage in load section 800a becomes small.
- the electromotive force generated in load section 800b there occurs a period during which the inverter output voltage in load section 800b becomes small. Therefore, both load units 800a and 800b can be in a regenerative state. In the period in which both are in the regenerative state, the shunt current I2a ⁇ 0 and the shunt current I2b ⁇ 0.
- the power ripple compensation section 830a generates a pulsating current and adjusts the shunt current I2a according to the change in the shunt current I2b.
- a ripple current is generated in power supply ripple compensator 830b, and shunt current I2b is adjusted according to changes in shunt current I2a.
- the current difference ⁇ I3 can be brought close to zero while suppressing an increase in the current difference ⁇ I3, so that the amount of current flowing into and out of the smoothing section 200 can be reduced.
- the load section 800a including the compressor motor load is a load having torque pulsation caused by a mechanical mechanism
- the compressor is accelerated and decelerated during one revolution, and the regeneration state is instantaneous.
- the shunt current I2a ⁇ 0 a current flows into the smoothing section 200 . Therefore, when the load section 800a is in a regenerative state, a pulsating current is generated in the power supply pulsating compensating section 830a to flow into the shunt current I2a.
- an increase in current difference ⁇ I3 can be suppressed.
- the load section 800b having the compressor motor load is a load having torque pulsation caused by a mechanical mechanism
- the compressor is accelerated and decelerated during one revolution, and the regeneration state is instantaneous.
- the shunt current I2b ⁇ 0 a current flows into the smoothing section 200 . Therefore, when the load section 800b is in the regenerative state, a pulsating current is generated in the power supply pulsating compensating section 830b to flow into the shunt current I2b.
- an increase in current difference ⁇ I3 can be suppressed.
- both the load sections 800a and 800b are compressor motor loads
- the outflow and inflow amounts of the smoothing section current I3 can be reduced. be able to.
- the stress on the capacitor element can be suppressed, and the aging deterioration of the capacitor element can be suppressed, so that the life of the capacitor 210 can be extended.
- an inexpensive capacitor element can be used. As a result, an increase in the cost of the device can be suppressed.
- FIG. 13 is a diagram showing a fifth configuration example that implements the power converter according to the first embodiment.
- the same reference numerals are assigned to the same or equivalent components as those shown in FIG.
- the constant current load units 810a and 810b are both assumed to be fan motor loads. Since constant current load sections 810a and 810b are both fan motor loads, load section 800a includes constant current load section 810a and power supply ripple compensation section 830a as components. Similarly, the load section 800b includes a constant current load section 810b and a power supply ripple compensation section 830b as constituent elements. 13 is different from FIG. 12 in that both load units 800a and 800b are not provided with pulsating load compensators 820a and 820b.
- both load sections 800a and 800b with fan motor loads are performing deceleration operations.
- the electromotive force generated in load section 800a there occurs a period during which the inverter output voltage in load section 800a becomes small.
- the electromotive force generated in load section 800b there occurs a period during which the inverter output voltage in load section 800b becomes small. Therefore, both load units 800a and 800b can be in a regenerative state. In the period in which both are in the regenerative state, the shunt current I2a ⁇ 0 and the shunt current I2b ⁇ 0.
- the power ripple compensation section 830a generates a pulsating current and adjusts the shunt current I2a according to the change in the shunt current I2b.
- a ripple current is generated in power supply ripple compensator 830b, and shunt current I2b is adjusted according to changes in shunt current I2a.
- the current difference ⁇ I3 can be brought close to zero while suppressing an increase in the current difference ⁇ I3, so that the amount of current flowing into and out of the smoothing section 200 can be reduced.
- the outflow and inflow amounts of the smoothing section current I3 can be reduced. can be done.
- the stress on the capacitor element can be suppressed, and the aging deterioration of the capacitor element can be suppressed, so that the life of the capacitor 210 can be extended.
- an inexpensive capacitor element can be used. As a result, an increase in the cost of the device can be suppressed.
- FIG. 14 is a block diagram illustrating an example of a hardware configuration that implements functions of a control unit according to Embodiment 1.
- FIG. 15 is a block diagram illustrating another example of a hardware configuration that implements the functions of the control unit according to the first embodiment;
- the processor 420 may be arithmetic means such as an arithmetic unit, a microprocessor, a microcomputer, a CPU (Central Processing Unit), or a DSP (Digital Signal Processor).
- the memory 422 includes non-volatile or volatile semiconductor memories such as RAM (Random Access Memory), ROM (Read Only Memory), flash memory, EPROM (Erasable Programmable ROM), EEPROM (registered trademark) (Electrically EPROM), Magnetic discs, flexible discs, optical discs, compact discs, mini discs, and DVDs (Digital Versatile Discs) can be exemplified.
- the memory 422 stores programs for executing the functions of the control unit 400 in the first embodiment.
- the processor 420 executes the programs stored in the memory 422, and refers to the tables stored in the memory 422, thereby performing the above-described processing. It can be carried out. Results of operations by processor 420 may be stored in memory 422 .
- the processing circuit 423 shown in FIG. 15 can also be used.
- the processing circuit 423 corresponds to a single circuit, a composite circuit, an ASIC (Application Specific Integrated Circuit), an FPGA (Field-Programmable Gate Array), or a combination thereof.
- Information to be input to the processing circuit 423 and information to be output from the processing circuit 423 can be obtained via the interface 424 .
- part of the processing in the control unit 400 may be performed by the processing circuit 423 and the processing not performed by the processing circuit 423 may be performed by the processor 420 and the memory 422 .
- the power converter according to Embodiment 1 includes a converter, a smoothing unit and a first inverter connected to the output end of the converter, and a second inverter connected in parallel to the first inverter.
- An inverter and a control unit are provided.
- the control unit controls the operation of the converter, the first inverter, or the second inverter to suppress the current flowing through the smoothing unit, and controls the second device equipped with the second inverter and the second motor.
- the operation of the first inverter is controlled according to the operating state of the second load section including the first inverter.
- the power conversion device utilizes a device configuration in which a plurality of devices are driven by one converter and a plurality of inverters connected to the converter, and performs control to suppress the current flowing through the smoothing section. conduct.
- a device configuration in which a plurality of devices are driven by one converter and a plurality of inverters connected to the converter, and performs control to suppress the current flowing through the smoothing section. conduct.
- FIG. 16 is a diagram showing a configuration example of a refrigeration cycle device 900 according to Embodiment 2.
- a refrigerating cycle applied equipment 900 according to the second embodiment includes the power converter 1A described in the first embodiment.
- the refrigerating cycle applied equipment 900 according to Embodiment 1 can be applied to products equipped with a refrigerating cycle, such as air conditioners, refrigerators, freezers, and heat pump water heaters.
- constituent elements having functions similar to those of the first embodiment are assigned the same reference numerals as those of the first embodiment.
- Refrigerating cycle applied equipment 900 includes compressor 315 incorporating motor 314 according to Embodiment 1, four-way valve 902, indoor heat exchanger 906, expansion valve 908, and outdoor heat exchanger 910, and refrigerant pipe 912. attached through
- a compression mechanism 904 that compresses the refrigerant and a motor 314 that operates the compression mechanism 904 are provided inside the compressor 315 .
- the refrigeration cycle applied equipment 900 can perform heating operation or cooling operation by switching operation of the four-way valve 902 .
- the compression mechanism 904 is driven by a variable speed controlled motor 314 .
- the refrigerant is pressurized by the compression mechanism 904 and sent out through the four-way valve 902, the indoor heat exchanger 906, the expansion valve 908, the outdoor heat exchanger 910, and the four-way valve 902. Return to compression mechanism 904 .
- the refrigerant is pressurized by the compression mechanism 904 and sent through the four-way valve 902, the outdoor heat exchanger 910, the expansion valve 908, the indoor heat exchanger 906, and the four-way valve 902. Return to compression mechanism 904 .
- the indoor heat exchanger 906 acts as a condenser to release heat, and the outdoor heat exchanger 910 acts as an evaporator to absorb heat.
- the outdoor heat exchanger 910 acts as a condenser to release heat, and the indoor heat exchanger 906 acts as an evaporator to absorb heat.
- the expansion valve 908 reduces the pressure of the refrigerant to expand it.
- 1, 1A power conversion device, 2, 2A motor drive device, 110 commercial power supply, 130 rectification section, 131 to 134, 621 to 624 rectification element, 200, 200a, 200b smoothing section, 210 capacitor, 310, 310a, 310b inverter, 311a to 311f, 611 to 615, 632 switching elements, 312a to 312f freewheeling diodes, 313a, 313b, 501, 501a, 501b, 502, 502a, 502b current detectors, 314, 314a, 314b motors, 315 compressors, 315a, 315b equipment, 400 control section, 420 processor, 422 memory, 423 processing circuit, 424 interface, 600, 601 boost section, 631, 710 reactor, 633 diode, 700, 701, 702 converter, 800a, 800b load section, 810a, 810b Constant current load section, 820a, 820b Pulsation load compensation section, 830a, 830b Power supply
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Abstract
Description
図1は、実施の形態1に係る電力変換装置の基本構成及び基本機能の説明に供する図である。図1において、電力変換装置1は、商用電源110及び圧縮機315に接続されている。商用電源110は交流電源の一例であり、圧縮機315は実施の形態1で言う機器の一例である。圧縮機315には、モータ314が搭載されている。電力変換装置1と、圧縮機315が備えるモータ314とによって、モータ駆動装置2が構成される。
図16は、実施の形態2に係る冷凍サイクル適用機器900の構成例を示す図である。実施の形態2に係る冷凍サイクル適用機器900は、実施の形態1で説明した電力変換装置1Aを備える。実施の形態1に係る冷凍サイクル適用機器900は、空気調和機、冷蔵庫、冷凍庫、ヒートポンプ給湯器といった冷凍サイクルを備える製品に適用することが可能である。なお、図16において、実施の形態1と同様の機能を有する構成要素には、実施の形態1と同一の符号を付している。
Claims (14)
- 交流電源から印加される電源電圧を整流すると共に、要すれば前記電源電圧を昇圧するコンバータと、
前記コンバータの出力端に接続される平滑部と、
前記コンバータの前記出力端に接続され、前記コンバータ及び前記平滑部から出力される電力を第1の交流電力に変換し、第1のモータが搭載された第1の機器に出力する第1のインバータと、
前記第1のインバータに並列に接続され、前記コンバータ及び前記平滑部から出力される電力を第2の交流電力に変換し、第2のモータが搭載された第2の機器に出力する第2のインバータと、
前記コンバータ、前記第1のインバータ又は前記第2のインバータの動作を制御して前記平滑部に流れる電流を抑制しつつ、前記第2のインバータ、及び前記第2の機器を含む第2の負荷部の動作状態に応じて前記第1のインバータの動作を制御する制御部と、
を備えた電力変換装置。 - 前記制御部は、第2の負荷部の動作状態に応じて前記第1のインバータの動作を制御しつつ、前記第1のインバータ、及び前記第1のモータが搭載された前記第1の機器を含む第1の負荷部の動作状態に応じて前記第2のインバータの動作を制御する
請求項1に記載の電力変換装置。 - 前記制御部は、前記第2の負荷部の動作状態が回生状態となる期間では、前記第1のインバータにおいて脈動電流を発生させ、前記第1の負荷部の動作状態が回生状態となる期間では、前記第2のインバータにおいて脈動電流を発生させる
請求項2に記載の電力変換装置。 - 前記制御部は、前記第2のモータの回転速度に基づいて前記脈動電流を補正する
請求項3に記載の電力変換装置。 - 前記制御部は、前記電力変換装置の周囲温度に基づいて前記脈動電流を補正する
請求項3に記載の電力変換装置。 - 前記第1及び第2の負荷部の動作状態は、前記第1及び第2のインバータ又は前記第1及び第2のモータ又は前記第1及び第2の機器を検出対象とした物理量を検出する検出部の検出値、前記制御部の制御の過程で生成される指令値、及び前記制御部の制御の過程で推定される推定値のうちの少なくとも1つによって得られる
請求項2から5の何れか1項に記載の電力変換装置。 - 前記平滑部は第1及び第2の平滑部から成り、
前記第1の平滑部は前記第1のインバータの入力端に接続され、
前記第2の平滑部は前記第2のインバータの入力端に接続される
請求項1から6の何れか1項に記載の電力変換装置。 - 前記第1のインバータに流れる電流を検出する第1の検出部と、前記第2のインバータに流れる電流を検出する第2の検出部と、を備え、
前記制御部は、前記第1の検出部による検出値に基づいて前記第1のインバータが回生状態であるか否かを判断し、前記第2の検出部による検出値に基づいて前記第2のインバータが回生状態であるか否かを判断する
請求項7に記載の電力変換装置。 - 請求項1から8の何れか1項に記載の電力変換装置を備えるモータ駆動装置。
- 前記第1の機器は圧縮機であり、
前記第2の機器はファンである
請求項9に記載のモータ駆動装置。 - 前記第1及び第2の機器は圧縮機である
請求項9に記載のモータ駆動装置。 - 前記第1及び第2の機器はファンである
請求項9に記載のモータ駆動装置。 - 請求項1から8の何れか1項に記載の電力変換装置を備える冷凍サイクル適用機器。
- 請求項9から12の何れか1項に記載のモータ駆動装置を備える冷凍サイクル適用機器。
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JP2012029378A (ja) * | 2010-07-20 | 2012-02-09 | Honda Motor Co Ltd | 負荷制御装置 |
JP2012151960A (ja) * | 2011-01-18 | 2012-08-09 | Daikin Ind Ltd | 電力変換装置 |
JP2013207925A (ja) * | 2012-03-28 | 2013-10-07 | Mitsubishi Electric Corp | モータ駆動制御装置、及び冷凍空気調和装置 |
WO2016035216A1 (ja) * | 2014-09-05 | 2016-03-10 | 三菱電機株式会社 | 電力変換装置、それを備えたモータ駆動装置、送風機および圧縮機、ならびに、それらの少なくとも一方を備えた空気調和機、冷蔵庫および冷凍機 |
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Publication number | Priority date | Publication date | Assignee | Title |
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JP2012029378A (ja) * | 2010-07-20 | 2012-02-09 | Honda Motor Co Ltd | 負荷制御装置 |
JP2012151960A (ja) * | 2011-01-18 | 2012-08-09 | Daikin Ind Ltd | 電力変換装置 |
JP2013207925A (ja) * | 2012-03-28 | 2013-10-07 | Mitsubishi Electric Corp | モータ駆動制御装置、及び冷凍空気調和装置 |
WO2016035216A1 (ja) * | 2014-09-05 | 2016-03-10 | 三菱電機株式会社 | 電力変換装置、それを備えたモータ駆動装置、送風機および圧縮機、ならびに、それらの少なくとも一方を備えた空気調和機、冷蔵庫および冷凍機 |
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