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Inverter device and air conditioner

A technology for inverters and motors, which is applied to control electromechanical transmission devices, output power conversion devices, irreversible cycle compressors, etc. Pollution, improved power efficiency, reduced size effects

Inactive Publication Date: 2011-02-09
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, when a smoothing unit with insufficient capacity is used in this way, the output voltage of the smoothing unit fluctuates greatly at a frequency twice the frequency of the AC power supply.
In this case, in the inverter device using the voltage command compensator 11p of the conventional example, there is a problem that the current distortion of the motor 5p cannot be sufficiently suppressed due to the influence of the ripple voltage.

Method used

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  • Inverter device and air conditioner
  • Inverter device and air conditioner
  • Inverter device and air conditioner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0046] figure 1 A block diagram showing the configuration of the inverter device in the first embodiment.

[0047] figure 1 Among them, the inverter device in Embodiment 1 rectifies the single-phase AC voltage S1 from the AC power source 1 and then converts it to AC by using pulse width modulation (PWM: Pulse Width Modulation) to generate the driving voltage S4. The inverter device supplies the drive voltage S4 to the motor 5 to drive the motor 5 . As the motor 5 rotates, the refrigerant is compressed in the compressor constituting the air conditioner. The inverter device in Embodiment 1 includes a rectifying unit 2, a smoothing unit 3, a DC / AC converting unit 4, a current detecting unit 6, a rotational phase detecting unit 7, a target rotational speed setting unit 15, a current command generating unit 8, A voltage command generation unit 9 , a voltage command correction unit 11 , a voltage phase detection unit 12 , a summing unit 16 and a PWM signal generation unit 10 . ...

Embodiment approach 2

[0081] In Embodiment 2, differences from Embodiment 1 will be mainly described. Other configurations, operations, and effects are the same as those in Embodiment 1, and therefore description thereof will be omitted.

[0082] Figure 7A It is a block diagram showing the configuration of the inverter device in the second embodiment. Figure 7A Among them, the voltage command correction unit 11 generates a voltage command correction signal S11 based on the voltage phase signal S12, the rotation phase signal S7, and the current command signal S8.

[0083] Figure 7B It is a detailed block diagram showing the configuration of the voltage command correction unit 11 in the second embodiment. The voltage command correction unit 11 includes a harmonic generation unit 40 , a timing generation unit 41 , an amplitude and phase setting unit 42 , a control unit 43 , a switch unit 44 and a signal smoothing unit 45 .

[0084]The harmonic generation unit 40 generates a harmonic signal S40 ...

other Embodiment approach

[0091] In other embodiments, the amplitude and phase setting unit 42 generates a plurality of sub-amplitude and phase setting signals with different amplitudes or phases based on the harmonic signal S40 and the current command signal S8. The amplitude and phase setting unit 42 also selects a signal of one line from a plurality of lines of the auxiliary amplitude and phase setting signals for each sub-smoothed voltage period based on the timing signal S41, and generates the amplitude and phase setting signal S42.

[0092] Furthermore, in other embodiments, the amplitude and phase setting unit 42, such as Figure 7C as shown, Figure 7B The harmonic generation unit 40 is omitted, and the rotation phase signal S7 is directly input to the amplitude and phase setting unit 42 . In the amplitude-phase setting unit 42, the frequency of the amplitude-phase setting signal S42 is set in advance at a predetermined value substantially equal to the fifth harmonic distortion. Furthermore, ...

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Abstract

A rectification unit and a smoothing unit rectify and smooth AC voltage from an AC power source and generate a smoothed voltage containing a waveform of smoothing voltage cycle corresponding to half of the AC voltage cycle. A DC / AC conversion unit converts the smoothed voltage into drive voltage and supplies it to a motor. A current detection unit detects a power current containing a waveform of the smoothed voltage cycle and a waveform distortion and flowing to the motor, and generates a current detection signal. A target rpm setting unit generates a target rpm signal indicating a target value of the rpm of the motor. According to the current detection signal and the target rpm signal, a voltage instruction output unit generates and outputs a voltage instruction signal indicating an instruction value of a signal to be modulated in a PWM. According to the current detection signal and the target rpm signal, a voltage instruction correction unit generates a voltage instruction correction signal for correcting the waveform distortion. A signal-to-be-modulated generation unit and a PWM signal generation unit add a voltage instruction correction signal to the voltage instruction signalso as to generate a PWM signal.

Description

technical field [0001] The present invention relates to a technique for reducing distortion of an inverter, and more specifically, relates to an inverter device and an air conditioner. Background technique [0002] like Figure 13 The conventional example shown is an inverter device that reduces distortion of an AC current flowing through an AC power source for driving a motor (for example, refer to Patent Document 1). [0003] Figure 13 Among them, the conventional inverter device is composed of a DC / AC conversion unit 4p, a current detection unit 6p, a current command calculation unit 8p, a voltage command calculation unit 9p, a PWM signal generation unit 10p, and a voltage command compensation unit 11p. The DC / AC conversion unit 4p converts the output voltage of a smoothing unit (not shown) into a desired AC voltage, and drives the motor 5p. The current detection unit 6p detects the current flowing through the motor 5p. The current command calculation unit 8p calculate...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/06F24F11/02F24F11/46F24F11/61F24F11/64F24F11/86F24F11/88F25B1/00H02P21/22H02P27/08
CPCH02P29/0038H02M5/458H02P27/08H02M1/42H02P27/06
Inventor 福荣贵史松城英夫小川正则
Owner PANASONIC CORP