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Inverter

A converter and current detector technology, applied in output power conversion devices, electronic commutators, conversion of AC power input to DC power output, etc., can solve the problems of complex software, hindering miniaturization, and increasing the number of components, etc. Achieve the effect of improving low noise and low vibration, improving the freedom of configuration, and smoothing the current.

Inactive Publication Date: 2009-12-09
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, it is necessary to change the two phases by phase detection, and the control software becomes complicated
In addition, therefore, shunt resistors are required in all 3 phases, which increases the number of parts and hinders miniaturization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0084] figure 1 It is a diagram of the inverter device 23 and its peripheral circuits according to Embodiment 1 of the present invention. with the background technology Figure 22 The difference is that the control circuit 13 becomes the control circuit 14 without the shunt resistor 17 . Regarding other circuit units, with Figure 22 Similarly, the reference numerals and the like can be used as they are.

[0085] The control circuit 14 connects the upper arm switching elements U, V, W and the lower arm switching elements X, Y, Z through the connection line 18, and controls each switching element. When the switching element is an IGBT or a power MOSFET, it controls the gate voltage, and when it is a power transistor, it controls the base current.

[0086] exist Figure 24 The phase is 90 degrees, and only the current of two phases (V phase, W phase) flows in the lower arm. Similarly, at the phase 210 degrees, only the U-phase and V-phase currents flow in the W-phase, U-p...

Embodiment approach 2

[0108] Figure 6 ~ Figure 9 A characteristic diagram related to Embodiment 2 of the present invention is shown. Inverter device and its peripheral circuits, and related to Embodiment 1 of the present invention figure 1 same.

[0109] Image 6 The upper side of Figure 21 The case where the phase is 90 degrees. On the lower side, the same ON period 2δ is cut from the ON periods of U, V, and W of the upper arm, and the length (2δ) of the upper cycle period and the length (2δ=δ+δ) of the lower cycle period are made the same.

[0110] Likewise, in Figure 7 , the lower side shows that when the phase is 75 degrees, 2(τ-γ) is cut from each ON period of U, V, and W of the upper arm, so that the length of the upper cycle period (2τ) and the length of the lower cycle period (2τ= τ+τ) the same situation.

[0111] Therefore, in the preceding and following carriers, the intervals between the energization periods are equal, thereby improving the effect of shortening the carrier cyc...

Embodiment approach 3

[0115] exist Figure 10 In the figure, the inverter device 23 is attached closely to the right side of the electric compressor 40, and is shown. The compression mechanism part 28, the motor 11, etc. are provided in the metal frame 32. As shown in FIG.

[0116] The refrigerant is sucked in from the suction port 33 , and the motor 11 drives the compression mechanism unit 28 (scroll in this example), thereby compressing the refrigerant. The compressed refrigerant cools the motor 11 when passing through the motor 11 and is discharged from the discharge port 34 .

[0117] The cassette 30 is used in such a manner that the inverter device 23 is installed in the electric compressor 40 . Inverter circuit unit 10 , which is a heat source, is cooled by the low-pressure refrigerant passing through low-pressure pipe 38 . The inverter device 23 is arranged below the suction pipe 38 so that no dew condensation occurs during this cooling, and the ambient temperature of the inverter circuit...

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PUM

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Abstract

The present invention provides a converter device that does not need to develop complicated control software, does not generate current distortion, is compact, has high vibration resistance, and can detect phase currents. Shunt resistors (15) and (16) serving as one type of current detectors are respectively provided between the lower arm switching elements (X, Y, Z) of two of the three phases and the negative side of the DC power supply. In all three phases, only the same ON period is reduced from the ON period of the upper arm switching elements (U, V, W) within the carrier period. Therefore, the phase currents of two phases of the phases provided with the shunt resistors (15) and (16) are detected. The present invention provides a converter device capable of detecting phase current without generating current distortion by controlling a converter circuit (10) via a connection line (18) with control software built in a control circuit (14), eliminating the complexity of the control software.

Description

technical field [0001] The present invention relates to a PWM3 phase modulation converter device with a phase current detection component. Background technique [0002] Heretofore, as such a phase current detection method, in an inverter device that drives a sensorless DC brushless motor based on a sine wave drive method using PWM modulation, two output lines are directly detected from three output lines of the inverter device. The current method is well known (for example, Japanese Patent Application Laid-Open No. 2000-333465 (page 9, FIG. 2 )). [0003] Next, this circuit will be described. exist Figure 11 The middle table shows the converter device and its surrounding circuits. In the control circuit 7 of the inverter device 20 , the U-phase current is input from the current sensor 8 and the W-phase current is input from the current sensor 9 . From these two current values, at the neutral point of the stator coil 4, the current of the V phase is obtained by applying K...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48B60H1/32F25B1/04H02P6/18
CPCH02M7/5395H02M1/009
Inventor 后藤尚美
Owner PANASONIC CORP
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