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Digital conversion device and power conversion device

A power conversion device, digital conversion technology, applied in the direction of output power conversion device, analog-to-digital converter, analog-to-digital conversion, etc.

Inactive Publication Date: 2011-09-28
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Even in such a case, in order to realize stable and high-precision control, it is necessary to remove the impulse noise, but in this case, the same problem as the above-mentioned problem arises

Method used

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  • Digital conversion device and power conversion device
  • Digital conversion device and power conversion device
  • Digital conversion device and power conversion device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0040] The power conversion device according to Embodiment 1 of the present invention includes an AD converter that samples and holds current values ​​at intervals shorter than the time required for conversion to digital information. The digitally converted output with noise removed internally realizes stable and high-precision control. The power conversion device of the present embodiment is built in, for example, a system such as an air conditioner.

[0041] 1.1 Structure of power conversion device

[0042] figure 1 An overall configuration diagram showing the power conversion device according to Embodiment 1 of the present invention. The power conversion device of this embodiment includes: an active inverter circuit (DC power conversion unit) 116 that converts the AC power output from the AC power supply 101 into DC power; The smoothing capacitor 106 that smoothes the current of the smoothing capacitor 106; the inverter circuit (AC power conversion unit) 107 that convert...

Embodiment approach 2

[0070] The power conversion device of Embodiment 2 differs from the power conversion device of Embodiment 1 in the configuration and operation of AD conversion units 151 and 152 . The AD converters 151 and 152 of Embodiment 1 perform AD conversion at the end. On the other hand, in Embodiment 2, AD conversion is performed after sample hold. That is, an AD conversion circuit is provided next to each sample-and-hold circuit, and after all the information is temporarily converted into digital information, discrete value removal and averaging are performed by digital operations. Accordingly, the AD conversion units 151 and 152 can be realized more easily as a large scale integrated circuit (LSI). Embodiment 2 is the same as Embodiment 1 except for the configuration and operation of AD converters 151 and 152 .

[0071] Image 6 The configuration of the AD converter 151 according to Embodiment 2 of the present invention is shown. AD conversion section 152 also has Image 6 struc...

Embodiment approach 3

[0077] The power conversion device of Embodiment 3 differs from the power conversion devices of Embodiments 1 and 2 in the configuration and operation of AD converters 151 and 152 . In the AD converters 151 and 152 of Embodiment 1 and Embodiment 2, the discrete value removal circuit 307 removes the farthest values, but in Embodiment 3 the maximum and minimum values ​​are removed. In Embodiment 3, the configuration and operation other than the above are the same as those in Embodiment 1.

[0078] Figure 8 The structure of the AD converter 151 of this embodiment is shown. In addition, the AD conversion unit 152 also has Figure 8 structure shown. Hereinafter, the configuration and operation of the AD conversion unit 151 will be described as an example. The AD converter 151 of this embodiment does not use figure 2 The discrete value removing circuit 307 is shown, but the maximum and minimum value removing circuit 407 is used which removes the signal having the maximum valu...

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PUM

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Abstract

Provided is a digital conversion device which removes a pulse-shaped noise component without causing a delay of obtained information. Provided is also a power conversion device which performs power conversion by using the digital conversion device. The digital conversion device includes a plurality of information signal holding units (301), each of which inputs an information signal having a value changing from time to time by delaying the value by a predetermined time and holds the inputted value; a removal unit (307) which removes the value farthest from the other values among the values held in the information signal holding units; an averaging unit (308) which averages the values not removed by the removal unit; and a conversion unit (309) which performs an AD conversion on the value outputted from the averaging unit and outputs the obtained value as digital information. The predetermined time is shorter than the time required for conversion into the digital information in the conversion unit.

Description

technical field [0001] The present invention relates to a digital conversion device for converting an analog signal (for example, an information signal representing a current value whose value changes moment by moment) into a digital signal, and using the digital conversion device and using a switch unit to convert the power form according to its utilization purpose, That is, a power conversion device used in power electronics. In particular, the present invention relates to a power converter for temporarily converting AC power to DC and then to another AC, and a power converter for completely converting DC power to a plurality of different AC powers. Specific examples of the power conversion device include household and commercial air conditioners, refrigerators, and the like that use an AC power source and drive an electric compressor at a variable speed through an inverter. Background technique [0002] The power conversion device includes both a converter unit (converte...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03M1/12H02M7/48
CPCH03M1/0656H02M2001/007H03M1/12H03M1/0863H02M7/48H02M2001/0012H02M1/0012H02M1/007
Inventor 土山吉朗京极章弘川崎智广田中秀尚
Owner PANASONIC CORP
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