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Apparatus and method for detecting phase currents of inverter

A phase current and detector technology, applied in the field of phase current devices, can solve problems such as inability to detect overcurrent, failure to detect phase current, damage to components and loads, etc.

Active Publication Date: 2007-07-04
LSIS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, when the minimum time required to detect the phase current in the current loop is insufficient, the phase current supplied to the load cannot be detected
[0018] If the phase current is not detected, when the overcurrent is supplied from the inverter to the load, the overcurrent cannot be detected, and the parts constituting the inverter and the load will be damaged due to the overcurrent

Method used

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  • Apparatus and method for detecting phase currents of inverter
  • Apparatus and method for detecting phase currents of inverter
  • Apparatus and method for detecting phase currents of inverter

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Embodiment Construction

[0035] Now, an apparatus and method for detecting a phase current of an inverter according to a preferred embodiment of the present invention will be described with reference to the accompanying drawings in which the preferred embodiment of the present invention is shown. Hereinafter, the present invention will be described more fully with reference to the accompanying drawings showing embodiments of the invention. However, the invention should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. Like numbers indicate like elements.

[0036] FIG. 1 is a block diagram showing an inverter according to an embodiment of the present invention. Reference numeral 100 denotes an AC power source. Reference numeral 110 denotes a power converter that converts AC power supplied from the AC power source 10...

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Abstract

The present invention previously sets a threshold voltage, compares the set threshold voltage with a reference voltage, and judges whether a minimal pulse width of a PWM signal is obtained. When a pulse width of one PWM signal is equal to or greater than the minimal pulse width, but each pulse width of two PWM signals is less than the minimal pulse width, a sine wave voltage corresponding to one of the two PWM signals less than the minimal pulse width is varied to a threshold voltage to detect two phase currents, and a remaining one phase current is calculated based on the two detected phase currents. After the phase current was detected by varying the threshold voltage, a level difference between an original sine wave voltage and the threshold voltage is set as a compensation voltage, and the sine wave voltage is compensated by the compensation voltage.

Description

[0001] claim priority [0002] This application is based on and claims priority from Korean Patent Application No. 10-2005-00136041 filed in the Korean Intellectual Property Office (KIPO) on Dec. 30, 2005, the contents of which are incorporated herein by reference in their entirety. technical field [0003] The present invention relates to a device and a method for detecting a phase current of an inverter, and more particularly, to a device and a method for detecting a phase current of an inverter, which detects an alternating current output from the inverter to a load (hereinafter referred to as Herein referred to as "AC") the three-phase current of the power supply. Background technique [0004] In general, inverters are widely used in order to precisely control loads such as induction motors. The inverter generates a pulse width modulated (hereinafter referred to as "PWM") signal, and selectively switches a plurality of switching elements through the generated PWM signal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M7/5387H02P27/02
CPCH02P2207/01H02P23/0036H02P2205/01H02P23/0004H02M7/48H02P27/06
Inventor 李敬注
Owner LSIS CO LTD
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