Phase current detector

A detection device and current detector technology, which is applied in the direction of output power conversion device, electrical components, AC power input conversion to DC power output, etc., can solve the problems of reduced operating range, abnormal noise, and difficulty in reducing ringing, etc., to achieve Effects of improving current detection accuracy, reducing measurement error, and improving current measurement accuracy
CN1953312AInactive Publication Date: 2007-04-25DAIKIN IND LTD
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Patent Information

Authority / Receiving Office
CN Β· China
Patent Type
Applications(China)
Current Assignee / Owner
DAIKIN IND LTD
Publication Date
2007-04-25
Estimated Expiration
Not applicable Β· inactive patent

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Abstract

A first capacitor (2a) is connected between the output terminals of a rectification circuit (2) the input of which is an AC power source (1), and a three-phase inverter (3) in parallel with the first capacitor (2a), and the output of the three-phase inverter (3) is supplied to a motor (4). A second capacitor (3a) is connected in parallel with the input side of the three-phase inverter (3), a current detector (5) between the first capacitor (2a) and second capacitor (3a), and a third capacitor in parallel with the first capacitor (2a) slightly closer to the power source than to the current detector (5). Thus, the capacitance of the second capacitor (3a) is set as small as possible in such a range that a power device is not broken down by a surge voltage attributed to switching to suppress ringing, so that current is incorporated at a high speed with a high precision.
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Description

[0001] This application is a divisional application of the original patent application number 02802758.2 (international application number: PCT / JP02 / 09901, filing date: September 25, 2002, invention name: phase current detection device). technical field

[0002] The present invention relates to a phase current detection device that detects a motor based on a current of a DC link and an additional vector diagram in a motor drive device that supplies an output from a PWM inverter to a motor and drives the motor phase current. Background technique

[0003] Conventionally, in a motor drive device in which an inverter drives a motor, a device for deforming an output pulse into a measurable output has been proposed as a device for detecting a motor phase current.

[0004] When the above-mentioned structure is adopted, the following disadvantages occur, namely, current measurement error due to ringing, waveform distortion due to extension of pulse output time, reduction of operatin...

Claims

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