KR20110067511A - Apparatus for controlling inverter and method thereof - Google Patents

Apparatus for controlling inverter and method thereof Download PDF

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Publication number
KR20110067511A
KR20110067511A KR1020090124125A KR20090124125A KR20110067511A KR 20110067511 A KR20110067511 A KR 20110067511A KR 1020090124125 A KR1020090124125 A KR 1020090124125A KR 20090124125 A KR20090124125 A KR 20090124125A KR 20110067511 A KR20110067511 A KR 20110067511A
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KR
South Korea
Prior art keywords
voltage
power
motor
inverter
unit
Prior art date
Application number
KR1020090124125A
Other languages
Korean (ko)
Inventor
공연준
김종률
이종혁
Original Assignee
위니아만도 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Publication date
Application filed by 위니아만도 주식회사 filed Critical 위니아만도 주식회사
Priority to KR1020090124125A priority Critical patent/KR20110067511A/en
Publication of KR20110067511A publication Critical patent/KR20110067511A/en

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/02—Details
    • H02H3/04—Details with warning or supervision in addition to disconnection, e.g. for indicating that protective apparatus has functioned
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
    • H02H3/26—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents
    • H02H3/32—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors
    • H02H3/34—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to difference between voltages or between currents; responsive to phase angle between voltages or between currents involving comparison of the voltage or current values at corresponding points in different conductors of a single system, e.g. of currents in go and return conductors of a three-phase system
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/08—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors
    • H02H7/085—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load
    • H02H7/0856—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load characterised by the protection measure taken
    • H02H7/0857—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for dynamo-electric motors against excessive load characterised by the protection measure taken by lowering the mechanical load of the motor
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
    • H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
    • H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
    • H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03K—PULSE TECHNIQUE
    • H03K7/00—Modulating pulses with a continuously-variable modulating signal
    • H03K7/08—Duration or width modulation ; Duty cycle modulation

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)

Abstract

PURPOSE: An apparatus and method for controlling an inverter are provided to prevent an inverter circuit from becoming damaged by stopping a motor when a low voltage or high voltage is generated. CONSTITUTION: A power supply unit(1) supplies AC power. A converter(2) converts the AC power into DC power. An inverter(3) receives the DC power converted by the converter and changes the DC power into three phase AC power. A voltage detector(5) detects a voltage outputted from the converter. A control unit(6) outputs a PWM(Pulse Width Modulation) signal for driving the motor through the inverter.

Description

Inverter control device and method {APPARATUS FOR CONTROLLING INVERTER AND METHOD THEREOF}

The present invention relates to an inverter control apparatus and method, and more particularly, to an inverter control apparatus and method for preventing the motor abnormal operation and the damage of the inverter circuit due to the change of the input power and to maintain the inverter system stabilization.

If the input power is low in the inverter system, the motor fails to start due to the pressure (load) inside the motor when starting the motor, or is out of phase due to low voltage (back-EMF waveform is unstable. Motor's rotation stops due to mismatch between the output signal of the rotating magnetic field and the rotor of the motor), or when the low voltage occurs during operation, the system may be in an unstable state because the desired rotation speed (RPM) is not obtained. have. On the contrary, if the input power is high, the output current flowing into the motor increases, which may cause a breakdown of the control circuit due to a temperature rise of the component or an overcurrent.

The technical structure described above is a background technique for assisting the understanding of the present invention, and does not mean the prior art widely known in the technical field to which the present invention belongs.

The present invention checks the voltage value detected through the voltage detection circuit of the inverter circuit to stop the motor drive when a low voltage or high voltage occurs to prevent the motor abnormal operation due to input power fluctuations, damage to the inverter circuit and to maintain the stability of the system It is an object of the present invention to provide a control apparatus and method.

The configuration of the present invention, which is invented to achieve the above-described object, is as follows.

Inverter control apparatus according to the present invention is a converter unit for converting the AC power input to the DC power, and an inverter unit for receiving the converted DC power from the converter unit to convert to three-phase AC power and drive the motor in accordance with the PWM signal And a voltage detector for detecting a voltage output from the converter, and a controller for comparing the detected voltage and the reference voltage range of the voltage detector and outputting the PWM signal for driving the motor to the inverter according to the comparison result. Characterized in that.

In the present invention, the control unit is characterized in that for receiving the detection voltage from the voltage detector according to the input switching frequency.

In the present invention, when the detection voltage is out of the reference voltage range, the controller displays an error state and outputs a PWM signal for stopping the motor driving.

The present invention may further include a display unit which displays an error state under the control of the controller.

In the present invention, the motor is characterized in that the three-phase BLDC compressor motor.

In addition, the inverter control method of the present invention is a step of receiving a detection voltage from a voltage detector for converting an input AC power source into a DC power source according to a switching frequency, comparing the detected voltage and the reference voltage range and the inverter according to the comparison result And outputting a PWM signal for driving the motor negatively.

In the present invention, the step of receiving the detection voltage is characterized in that for receiving the detection voltage for half a period of the inverse of the switching frequency.

In the present invention, when the detected voltage is out of the reference voltage range, an error state is displayed and the PWM signal for stopping motor operation is output.

As described above, the present invention checks the voltage value detected through the voltage detection circuit of the inverter circuit to stop the motor drive when a low voltage or high voltage is generated to prevent motor abnormal operation due to input power fluctuations, damage to the inverter circuit To stabilize.

Hereinafter, the present invention will be described in more detail with reference to Examples. These embodiments are only for illustrating the present invention, and the scope of rights of the present invention is not limited by these embodiments.

In this process, the thickness of the lines or the size of the components shown in the drawings may be exaggerated for clarity and convenience of description. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout the specification.

1 is a block diagram illustrating a configuration of an inverter control apparatus according to an embodiment of the present invention.

Referring to FIG. 1, the inverter control apparatus according to the present embodiment includes a power supply unit 1, a converter unit 2, an inverter unit 3, a voltage detector 5, a controller 6, and a display unit 7. .

The power supply unit 1 supplies commercial AC power, and the converter unit 2 converts AC power supplied from the power supply unit 1 into DC power.

The inverter unit 2 receives the DC power converted from the converter unit 2, converts the three-phase AC power, and drives the motor 4 according to the PWM signal.

The voltage detector 5 detects the voltage output from the converter 2.

Eventually, the power supplied from the commercial AC power is made of DC power through the converter unit 2 (converter, a device for converting AC power to DC power), and at this time, the DC link capacitor (Link) built in the converter unit 2 Rectified DC power supply through capacitors as a divider voltage using a plurality of resistors and connected to AD (Analog to Digital) input port of micro-controller or digital signal processor (DSP) to check voltage value to be.

The controller 6 compares the detected voltage of the voltage detector 5 with the reference voltage range and outputs a PWM signal for driving the motor to the inverter according to the comparison result. Here, the reference voltage range is an upper limit value and a lower limit value of a DC power which are read in advance from an analog to digital (AD) value input from the microcomputer.

Here, the AD detection time is determined by the switching frequency (Fs) for the motor operation. The detection unit time is set to 1 / Ts (inverse of Fs) for a half period, and the motor operation is stopped when an error condition is detected for a predetermined time. do. This is because during the other half period, the position detection is performed through the PWM output or BEMP detection required for driving the motor. At this time, the control is divided into the operation standby and during operation to increase the stability and control accuracy of the system by varying the upper and lower limit values and the error detection time.

The controller 6 displays an error state when the detected voltage is out of the reference voltage range, and outputs a PWM signal for stopping the driving of the motor 4. That is, the controller 6 compares the detected voltage detected through the voltage detector 5 with the upper limit value and the lower limit value of the DC power supply, and displays an error state when the limit value is exceeded. Execute stop command.

The display unit 7 displays the error state under the control of the control unit 6.

2 is a flowchart illustrating an inverter control method according to an embodiment of the present invention.

Referring to FIG. 2, in the inverter control method according to the present embodiment, first, a detection voltage is input from the voltage detector 5 during a half cycle of the inverse 1 / Fs of the switching frequency Fs (S1). .

At this time, the detection voltage is compared with the reference voltage range (S2) and when the detection voltage is out of the reference voltage range, an error state is displayed and the motor operation is stopped (S3). That is, an error condition is displayed when the limit value is exceeded by comparing the detected voltage detected through the voltage detector 5 with the upper limit value and the lower limit value of the DC power supply, and the motor stop command is executed. .

If the detected voltage is within the reference voltage range, a PWM signal for driving the motor 4 is output (S4).

Then, the inverter unit 3 drives the motor 4 in accordance with the PWM signal.

As described above, the present invention checks the voltage value detected through the voltage detection circuit of the inverter circuit and stops the motor driving when a low voltage or a high voltage is generated, thereby preventing motor abnormal operation due to input power fluctuation, damage to the inverter circuit, and maintaining stabilization of the system. do.

As described above, the present invention has been described with reference to the embodiments shown in the drawings, but this is merely exemplary, and various modifications and equivalent other embodiments of the present invention may be made by those skilled in the art. I understand that it is possible. Therefore, the true technical protection scope of the present invention will be defined by the claims below.

1 is a block diagram illustrating a configuration of an inverter control apparatus according to an embodiment of the present invention.

2 is a flowchart illustrating an inverter control method according to an embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

1: power supply 2: converter

3: voltage detection unit 4: motor

5: voltage detector 6: controller

7 display unit

Claims (8)

A converter unit converting an input AC power into a DC power; An inverter unit which receives the DC power converted by the converter unit, converts the three-phase AC power, and drives a motor according to a PWM signal; A voltage detector detecting a voltage output from the converter; And And a controller for comparing the detected voltage with the reference voltage range of the voltage detector and outputting the PWM signal for driving the motor to the inverter according to the comparison result. The method of claim 1, wherein the control unit And a detection voltage is input from the voltage detection unit according to the input switching frequency. The method of claim 1, wherein the control unit And detecting the error state and outputting a PWM signal for stopping the motor driving when the detected voltage is out of the reference voltage range. The method of claim 1, And a display unit which displays an error state under the control of the controller. The method of claim 1, wherein the motor Inverter control device characterized in that the three-phase BLDC compressor motor. Receiving a detection voltage from a voltage detector for converting an input AC power into a DC power according to a switching frequency; And And comparing the detected voltage with a reference voltage range and outputting a PWM signal for driving the motor to the inverter unit according to the comparison result. The method of claim 6, wherein the step of receiving the detection voltage Inverter control method characterized in that for receiving a detection voltage during the half cycle of the switching frequency inverse. The method of claim 6, And displaying an error state when the detected voltage is out of the reference voltage range, and outputting the PWM signal for stopping motor operation.
KR1020090124125A 2009-12-14 2009-12-14 Apparatus for controlling inverter and method thereof KR20110067511A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020090124125A KR20110067511A (en) 2009-12-14 2009-12-14 Apparatus for controlling inverter and method thereof

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Application Number Priority Date Filing Date Title
KR1020090124125A KR20110067511A (en) 2009-12-14 2009-12-14 Apparatus for controlling inverter and method thereof

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KR20110067511A true KR20110067511A (en) 2011-06-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130111730A (en) * 2012-04-02 2013-10-11 엘에스산전 주식회사 Method for controlling medium voltage inverter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130111730A (en) * 2012-04-02 2013-10-11 엘에스산전 주식회사 Method for controlling medium voltage inverter

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