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Power conversion device

A power conversion device and conversion technology are applied in the direction of output power conversion device, conversion of AC power input to AC power output, and conversion of irreversible DC power input to AC power output, etc. The output of the AC conversion circuit does not take into account the change of voltage, etc., so as to achieve the effect of good efficiency

Active Publication Date: 2013-04-17
DAIKIN IND LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] However, as in the conventional example of Patent Document 2, when the output of the DC-AC converter circuit is controlled based on the current at the input side of the DC-AC converter circuit, the change in voltage is not taken into account, so the output of the DC-AC converter circuit control, less precise
That is, for example, when controlling the output of a DC / AC conversion circuit to prevent overheating of components in a power conversion device, the amount of heat generated in the components changes according to the power obtained from the current and voltage. In the conventional structure that controls the output of the DC-AC converter circuit based only on the current, it is necessary to consider the variation of the voltage and set the threshold within a safe range. Accordingly, the output of the DC-AC converter circuit will be limited, The problem of reduced work efficiency

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Examples

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Embodiment Construction

[0049] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. It should be noted that the following embodiments are essentially preferable examples, and are not intended to limit the present invention, the application objects of the present invention, or the range of applications of the present invention.

[0050] -the whole frame-

[0051] Embodiments of the present invention will be described below. like figure 1 As shown, the power conversion device (1) according to this embodiment includes: an AC-DC conversion circuit (2), a DC-AC conversion circuit (3) and a capacitor circuit (4). The input side of the AC / DC conversion circuit (2) is connected to a commercial power supply (5) supplying AC power, and the output side is connected in parallel with the capacitor circuit (4) and the DC / AC conversion circuit (3). In addition, the above-mentioned direct current conversion circuit ( 3 ) is connected to, for example, a moto...

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Abstract

The invention relates to a power conversion apparatus including a converter circuit and an inverter circuit. The invention allows more precise output control of the inverter circuit than a power conversion apparatus in which the output control is performed based on a current value only, thereby improving operation efficiency. A current sensor (17) detects input current of the inverter circuit (3), and a voltage sensor (15) detects input voltage of the inverter circuit (3). A power value calculator section (33) in an inverter microcomputer (30) obtains a power value based on the input current and the input voltage. The inverter microcomputer (30) and the control microcomputer (40) perform droop control of reducing the output of the inverter circuit (3) to make the power value smaller than a predetermined power value.

Description

technical field [0001] The invention relates to a power conversion device, in particular to a power conversion device related to output control of a direct current conversion circuit. Background technique [0002] Conventionally, there is known a power conversion device including an AC-DC converter circuit for converting AC power from an AC power source into DC power, and a DC converter circuit for converting the DC power of the AC-DC converter circuit into AC power of a predetermined frequency. In such a power conversion device, for example, as disclosed in Patent Document 1, a plurality of diodes are connected in a bridge shape to form an AC / DC conversion circuit, and a plurality of switching elements are connected in a bridge shape to form a DC / AC conversion circuit. Power conversion devices are widely known. [0003] On the other hand, as an output control method of an DC-AC converter circuit for driving and controlling a motor, for example, as disclosed in Patent Docum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M5/458H02P29/02H02M7/48
CPCH02M5/4585H02P29/028H02P29/032
Inventor 猿渡博孝小仓健嶋谷圭介吉坂圭一
Owner DAIKIN IND LTD