KR910006300Y1 - Preventing apparatus for phase current of inverter - Google Patents
Preventing apparatus for phase current of inverter Download PDFInfo
- Publication number
- KR910006300Y1 KR910006300Y1 KR2019890015724U KR890015724U KR910006300Y1 KR 910006300 Y1 KR910006300 Y1 KR 910006300Y1 KR 2019890015724 U KR2019890015724 U KR 2019890015724U KR 890015724 U KR890015724 U KR 890015724U KR 910006300 Y1 KR910006300 Y1 KR 910006300Y1
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- South Korea
- Prior art keywords
- phase
- inverter
- pulse width
- current
- width modulated
- Prior art date
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P1/00—Arrangements for starting electric motors or dynamo-electric converters
- H02P1/16—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters
- H02P1/26—Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual polyphase induction motor
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0003—Details of control, feedback or regulation circuits
- H02M1/0009—Devices or circuits for detecting current in a converter
Abstract
내용 없음.No content.
Description
제1도는 종래 인버터출력전류의 상간 억제 제어블록도.1 is a block diagram of a phase-inhibition control of a conventional inverter output current.
제2도는 본 고안 인버터출력전류의 상간 억제 제어방법에 대한 구성도.2 is a block diagram of the phase-inhibition control method of the inverter output current of the present invention.
제3도의 (a) 내지 (d)는 제2도 펄스폭변조신호발생부(14)의 파형도.(A) to (d) of FIG. 3 are waveform diagrams of the pulse width modulation signal generator 14 of FIG.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
11 : 변환부 12 : 인버터부11 conversion unit 12 inverter unit
13 : 3상전류검출부 14 : 펄스폭변조신호발생부13 three-phase current detection unit 14 pulse width modulation signal generator
15 : 베이스구동부 IM : 유도모터15: base drive IM: induction motor
C11 : 콘덴서C11: condenser
본 고안은 유도모터의 상간 제어에 관한 것으로, 특히 과전류보호수준에서 낮은 상간 억제 보호수준을 두어 과부하등 일시적인 고장상황에서 인버터의 출력전류가 증가하여 인버터가 빈번히 트립되는 것을 방지할 수 있도록한 인버터출력전류의 상간 억제 제어장치에 관한 것이다.The present invention relates to the phase control of induction motors. In particular, the inverter output has a low phase suppression protection level at the overcurrent protection level, which prevents the inverter from tripping frequently due to an increase in the output current of the inverter in a temporary failure situation such as an overload. It relates to an interphase suppression control device of a current.
일반적으로 인버터와 같은 전력용 반도체소자를 사용하는 전기기기에는 전력용반도체소자에 과다한 전류가 흘러 소자가 파괴되는 것을 미연에 방지하기 위한 과전류보호기능이 있다.In general, an electric device using a power semiconductor device such as an inverter has an overcurrent protection function to prevent the device from being destroyed due to excessive current flowing through the power semiconductor device.
이와같은 보호기능을 수행하기 위하여 종래에 있어서는 제1도에 도시한 바와같이 3상전류검출부(3)가 변류기(CT1-CT3)를 통해 인버터부(2)에 대한 출력전류의 크기를 검출하여 과전류보호수준을 초과한 것으로 판단되면 이에따른 제어신호를 베이스구동부(5)에 출력함에 따라 그 베이스구동부(5)은 인버터부(2)의 전력용 트랜지스터에 공급되는 베이스전류를 차단함과 아울러 베이스-에미터에 역전압을 인가하여 인버터부(2)를 트립(Trip)상태에 머물게 하므로 유도모터(IM)에는 더 이상 전류가 흐르지 않아 전력의 공급이 중단되게 되어 있었다.In order to perform such a protection function, as shown in FIG. 1, the three-phase current detection unit 3 detects the magnitude of the output current to the inverter unit 2 through the current transformers CT1-CT3 to protect the overcurrent. When it is determined that the level is exceeded, the control signal is output to the base driver 5 so that the base driver 5 cuts off the base current supplied to the power transistor of the inverter part 2, and also the base-emi. By applying a reverse voltage to the rotor to keep the inverter unit 2 in the trip (Trip) state, the induction motor (IM) no longer flows current, the power supply was to be stopped.
그러나 이와같은 종래의 인버터제어방식에 있어서는 인버터가 트립상태에 있게되면 유도모터에는 더 이상의 전력이 공급되지 않으므로 그 유도모터는 소정시간동안 자유회전되다가 정지하게 되어 트립된 상태에서는 속도제어가 불가능하게 되고, 이로인하여 작업손실을 초래하는 문제점이 있었다.However, in the conventional inverter control method, when the inverter is in the trip state, since no more power is supplied to the induction motor, the induction motor is freely rotated for a predetermined time and stops, so that the speed control is impossible in the tripped state. As a result, there was a problem that causes work loss.
본 고안은 이와같은 종래의 문제점을 해결하기 위하여 부하에 대한 제어기능을 상실하지 않고도 인버터의 출력신호를 제한할 수 있는 장치를 안출한 것으로 이를 첨부한 도면에 의하여 상세히 설명한다.The present invention devised a device that can limit the output signal of the inverter without losing the control function for the load in order to solve such a conventional problem will be described in detail with reference to the accompanying drawings.
제2도는 본 고안 인버터출력전류의 상기 억제 제어장치를 실현하기위한 구성도로서 이에 도시한 바와같이, 입력전원(AC)을 정류하여 출력하는 변환부(11)와, 평활용컨덴서(C11)를 통해 상기 변환부의 정류전압을 입력하여 유도모터(IM)의 구동신호를 출력하는 인버터부(12)와, 상기 인버터부(12)와 유도모터사이에 접속된 변류기(CT11-CT13)를 통해 각상에 흐르는 전류를 입력하여 상간억제보호수단과 비교한 다음 어떠한 특정상의 전류가 그 보호수준을 넣어서면 상간억제제어신호를 출력하는 3상전류검출부(13)와, 상기 3상전류검출부(13)로 부터 상간억제제어신호가 입력되면 반송파에 반전된 변조파를 가하여 얻을 펄스폭변조신호를 출력하는 펄스폭변조신호발생부(14)와, 상기 펄스폭변조신호발생부(14)로 부터 입력되는 신호에 따라 상기 인버터부(12)의 파워트랜지스터의 구동을 제어하는 베이스구동부(15)를 구성하였다.2 is a configuration diagram for realizing the above suppression control device of the inverter output current of the present invention. As shown in FIG. 2, the converter 11 for rectifying and outputting the input power source AC and the smoothing capacitor C11 are provided. The inverter unit 12 for inputting the rectified voltage of the conversion unit to output the driving signal of the induction motor IM, and the current transformers CT11-CT13 connected between the inverter unit 12 and the induction motor. The three-phase current detection unit 13 which inputs the flowing current, compares it with the interphase suppression protection means, and outputs an interphase suppression control signal when a certain phase current has its protection level, and the interphase suppression from the three-phase current detection unit 13. When a control signal is input, the pulse width modulated signal generator 14 outputs a pulse width modulated signal obtained by applying an inverted modulated wave to a carrier, and the signal is inputted from the pulse width modulated signal generator 14. Power of Inverter 12 The base driver 15 for controlling the driving of the transistor was configured.
이와같이 구성된 본 고안의 상간억제 제어장치를 살펴보면, 입력전원(AC)은 변환부(11)에서 정류되고, 이는 콘덴서(C11)를 통해 평활되어 인버터부(12)에 정전압으로 인가된다.Looking at the phase-inhibition control device of the present invention configured as described above, the input power source (AC) is rectified in the converter 11, which is smoothed through the capacitor (C11) is applied to the inverter unit 12 with a constant voltage.
이와같은 상태에서, 펄스폭변조신호발생부(14)는 제3도의 (a) 및 (b)와 같이 반송파(C1) 및 변조파(M1)에 의한 펄스폭변조신호를 출력하며, 베이스구동부(15)는 상기 펄스폭 변조신호발생부(14)로 부터 입력되는 신호를 소정레벨로 증폭하여 상기 인버터부(12)의 파워트랜지스터를 스위칭함에 따라 유도모터(IM)에 전류가 흘러 그 유도모터(IM)가 구동되게 된다.In this state, the pulse width modulated signal generator 14 outputs the pulse width modulated signal by the carrier wave C1 and the modulated wave M1 as shown in FIGS. 3A and 3B, and the base driver ( 15 may amplify a signal input from the pulse width modulation signal generator 14 to a predetermined level to switch a power transistor of the inverter unit 12 so that a current flows in the induction motor IM so that the induction motor ( IM) is driven.
한편, 3상전류검출부(13)은 변류기(CT11-CT13)를 통해 상기 유도모터(IM)의 각상에 흐르는 전류를 검출한 다음, 이를 과전류보호수준보다 낮게 설정시킨 출력전류상간보호수준과 비교하여 높은 것으로 판단되면 그의 출력단자(CS1)에 3상간억제제어신호(PSCS)를 출력한다.Meanwhile, the three-phase current detection unit 13 detects a current flowing in each phase of the induction motor IM through the current transformers CT11-CT13, and then compares it with the output current phase protection level that is set lower than the overcurrent protection level. If it is determined that the three-phase intermittent control signal PSCS is output to its output terminal CS1.
이에따라 상기 펄스폭변조신호발생부(14)는 제3도의 (c)와 같이 반송파(C2)에 과전류가 검출된 상의 변조파를 반전시킨 새로운 변조파(M'2)를 가하여 제3도의 (d)와 같이 펄스폭이 감소된 펄스폭변조신호를 생성한 다음 이를 상기 베이스구동부(15)에 인가하므로 이제까지 출력전류가 증가되던 상의 전류가 감소되고, 이후 상기 유도모터(IM)의 상의 전류가 상간억제보호수준보다 낮아지게 되는 순간 상기 펄스폭변조신호발생부(14)는 반송파(C2)에 변조파(M2)를 정상적으로 인가하게 된다.Accordingly, the pulse width modulated signal generator 14 adds a new modulated wave M'2 inverting the modulated wave in which the overcurrent is detected to the carrier C2 as shown in FIG. Since the pulse width modulated signal having the reduced pulse width is generated and then applied to the base driver 15, the current of the phase where the output current is increased is reduced, and then the current of the phase of the induction motor IM is phase-to-phase. As soon as the suppression protection level is lowered, the pulse width modulated signal generator 14 normally applies the modulated wave M2 to the carrier C2.
이상에서 상세히 설명한 바와같이 본 고안은 유도모터의 각상에 흐르는 전류가 과전류보호수준을 넘지 못하도록 하여 인버터가 트립되는 것을 방지하면서 부하의 제어기능을 수행할 수 있는 이점이 있다.As described in detail above, the present invention has the advantage that the current flowing in each phase of the induction motor does not exceed the overcurrent protection level, thereby preventing the inverter from tripping and performing a load control function.
Claims (1)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019890015724U KR910006300Y1 (en) | 1989-10-28 | 1989-10-28 | Preventing apparatus for phase current of inverter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR2019890015724U KR910006300Y1 (en) | 1989-10-28 | 1989-10-28 | Preventing apparatus for phase current of inverter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| KR910008109U KR910008109U (en) | 1991-05-31 |
| KR910006300Y1 true KR910006300Y1 (en) | 1991-08-22 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| KR2019890015724U KR910006300Y1 (en) | 1989-10-28 | 1989-10-28 | Preventing apparatus for phase current of inverter |
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| Country | Link |
|---|---|
| KR (1) | KR910006300Y1 (en) |
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1989
- 1989-10-28 KR KR2019890015724U patent/KR910006300Y1/en not_active IP Right Cessation
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| Publication number | Publication date |
|---|---|
| KR910008109U (en) | 1991-05-31 |
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