KR100265668B1 - A circuit for detecting over-current in inverter - Google Patents
A circuit for detecting over-current in inverter Download PDFInfo
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- KR100265668B1 KR100265668B1 KR1019970067621A KR19970067621A KR100265668B1 KR 100265668 B1 KR100265668 B1 KR 100265668B1 KR 1019970067621 A KR1019970067621 A KR 1019970067621A KR 19970067621 A KR19970067621 A KR 19970067621A KR 100265668 B1 KR100265668 B1 KR 100265668B1
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- overcurrent
- current
- inverter
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- 238000001514 detection method Methods 0.000 claims abstract description 11
- 238000010586 diagram Methods 0.000 description 5
- 230000005856 abnormality Effects 0.000 description 1
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
- G01R15/04—Voltage dividers
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16533—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application
- G01R19/16538—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values characterised by the application in AC or DC supplies
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/165—Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
- G01R19/16566—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533
- G01R19/16576—Circuits and arrangements for comparing voltage or current with one or several thresholds and for indicating the result not covered by subgroups G01R19/16504, G01R19/16528, G01R19/16533 comparing DC or AC voltage with one threshold
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- 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
Description
본 발명은 인버터 회로의 과전류 검출 회로에 관한 것으로, 특히 최소의 회로 소자만을 사용하도록 회로를 단순화하여 인버터에 과전류가 흐르는 것을 방지하도록 한 인버터 회로의 과전류 검출 회로에 관한 것이다.The present invention relates to an overcurrent detection circuit of an inverter circuit, and more particularly, to an overcurrent detection circuit of an inverter circuit which simplifies the circuit so as to use only a minimum of circuit elements to prevent an overcurrent from flowing into the inverter.
도 1은 일반적은 6-브리지 인버터의 회로도를 나탄낸 것으로서, 부하의 주파수를 제어 가능하게 하는 제 1내지 제 6 스위칭소자(S1~S6)와, 상기 스위칭소자(S1~S6)의 오프시 부하가 지니고 있는 인덕터 성분으로 인하여 유기되는 지연 전류를 처리하기 위한 제 1내지 제 6 다이오드(D1~D6) 가 조합 구성되어져 있다.FIG. 1 shows a circuit diagram of a general 6-bridge inverter, in which the first to sixth switching elements S1 to S6 for controlling the frequency of the load and the load when the switching elements S1 to S6 are off. The first to sixth diodes D1 to D6 for dealing with the delay current induced by the inductor component thereof are combined.
이와 같이 구성된 6-브리지 인버터 회로의 구동시에 정상 상태의 전류 흐름은 도 2에 도시하였고, 과전류 발생시의 전류 흐름은 도 3에 도시하였다.(도면 부호 L은 인덕터이고, R은 저항이며, SR은 분로 저항(Shunt Resistor)이다.The current flow in the steady state when the 6-bridge inverter circuit configured as described above is shown in FIG. 2, and the current flow in the occurrence of overcurrent is shown in FIG. 3. (L is an inductor, R is a resistance, and SR is Shunt Resistor.
도 2에 나타낸 바와 같이 제 1 스위칭소자(S1)에 제 6 스위칭소자(S6)의 구동시에 정상적인 전류 흐름을 보이나 제 1 스위칭소자(S1)와 제 2 스위칭소자(S2)의 구동시에 단락 사고나 부하의 급작스러운 변동으로 인하여 과전류가 흐르게 될 경우에 회로를 보호하는 과전류 검출 회로가 필요하게 된다.As shown in FIG. 2, a normal current flows when the sixth switching element S6 is driven to the first switching element S1, but a short circuit accident occurs when the first switching element S1 and the second switching element S2 are driven. Sudden fluctuations in the load necessitate an overcurrent detection circuit that protects the circuit in case of overcurrent flow.
종래의 상기 과전류 검출 회로는 도 4에 도시된 바와 같이 결선되어 직류 전원(DC)의 (-)링크에 연결된 분로 저항(SR)에 흐르는 전류에 의해 유발되는 전압값을 감지하여 과전류가 흐른다고 판단될 경우 회로를 보호하게 된다.The conventional overcurrent detection circuit detects a voltage value caused by a current flowing through a shunt resistor SR connected to a negative link of a DC power supply DC as shown in FIG. 4, and determines that an overcurrent flows. If so, the circuit is protected.
상술하면, 일정 전압이상(과전류 유발시)이 분로 저항(SR)에 걸릴 경우 제 2 포토 커플러(PC2)는 온상태가 되어 앤드 게이트(AND)의 입력에 "로우"를 인가시켜 마이컴 신호와 상관없이 앤드 게이트(AND)의 출력은 "로우"가 되어 트랜지스터(TR)의 출력은 "하이" 가 된다.In detail, when a certain voltage abnormality (when an overcurrent occurs) is applied to the shunt resistor SR, the second photo coupler PC2 is turned on to apply “low” to the input of the AND gate AND to correlate with the microcomputer signal. Without this, the output of the AND gate becomes "low" and the output of the transistor TR becomes "high".
그러면, 트랜지스터(TR)의 출력은 제 1 포토 커플러(PC1)에 입력으로 인가되어 아랫상의 파워 디바이스는 마이컴의 신호와는 무관하게 오프시켜 과전류 발생시 파워 디바이스의 보호를 가능하게 한다.Then, the output of the transistor TR is applied as an input to the first photo coupler PC1 so that the lower power device is turned off irrespective of the signal of the microcomputer to enable the protection of the power device in the event of an overcurrent.
이때, 포토 커플러(PC)는 제어부의 접지단(D.G)과 DC단의 접지단 (A.G)을 분리하기 위해 사용한다.In this case, the photo coupler PC is used to separate the ground terminal D.G of the control unit and the ground terminal A.G of the DC terminal.
그러나, 이러한 종래 과전류 검출 회로는 많은 회로 소자를 사용할 뿐만 아니라 안정화에 관련되 회로를 요구함에 따라 전체 회로가 복잡해져 원가 상승의 요인이 되는 문제점이 있다.However, such a conventional overcurrent detection circuit not only uses a large number of circuit elements but also requires a circuit related to stabilization, which causes a problem that the entire circuit becomes complicated and causes a cost increase.
따라서 본 발명은 상기한 종래 기술의 문제점을 해결하기 위해 제안한 것으로서, 최소의 회로 소자만을 사용하도록 회로를 단순화하여 인버터에 과전류가 흐르는 것을 방지하도록 한 인버터 회로의 과전류 검출 회로를 제공하는데 그 목적이 있다.Accordingly, an object of the present invention is to provide an overcurrent detection circuit of an inverter circuit which prevents an overcurrent from flowing through the inverter by simplifying the circuit to use only a minimum number of circuit elements. .
이러한 목적을 달성하기 위한 본 발명의 기술적 수단은, 직류 전원의 소정 링크에 연결되어 전류를 일정 비율로 분로시키는 전류 분로수단과, 마이컴 신호에 따라 스위칭되어 부하의 주파수를 제어 가능하게 하는 복수의 스위칭소자로 입력되는 스위칭 신호를 전류 분로수단에 유기되어지는 전압을 동작 전압으로 인가 받아 구동되어 신호 차단하는 스위칭수단으로 이루어짐을 특징으로 한다.The technical means of the present invention for achieving this object, the current shunt means connected to a predetermined link of the DC power supply for shunting the current at a constant ratio, and a plurality of switching to switch in accordance with the microcomputer signal to control the frequency of the load Characterized in that the switching signal is input to the device is driven by a voltage induced by the current shunt means as an operating voltage to drive the signal cut off.
제1도는 일반적인 6-브리지 인버터의 회로도.1 is a circuit diagram of a typical six-bridge inverter.
제2도는 제1도에 도시된 인버터 회로의 구동시에 정상 상태의 전류 흐름도.2 is a flow chart of a steady state when driving the inverter circuit shown in FIG.
제3도는 제1도에 도시된 인버터 회로의 구동시에 과전류 발생시의 전류 흐름도.3 is a flow chart of current generated when overcurrent occurs when the inverter circuit shown in FIG. 1 is driven.
제4도는 종래 인버터 회로의 과전류 검출 회로도.4 is an overcurrent detection circuit diagram of a conventional inverter circuit.
제5도는 본 발명에 의한 인버터 회로의 과전류 검출 회로도.5 is an overcurrent detection circuit diagram of an inverter circuit according to the present invention.
* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings
S : 스위칭소자 D : 다이오드S: Switching element D: Diode
SR : 분로 저항 PC : 포토 커플러SR: Shunt Resistance PC: Photo Coupler
TR :트랜지스터TR: Transistor
이하, 본 발명을 첨부한 도면에 의거하여 설명하면 다음과 같다.Hereinafter, the present invention will be described with reference to the accompanying drawings.
도 5는 본 발명에 의한 인버터 회로의 과전류 검출 회로도를 나타낸 것으로서, 부하의 주파수를 제어 가능하게 하는 복수의 스위칭소자(S1, S2, …)가 스위칭되게 마이컴 신호에 따라 스위칭신호를 출력하는 포토 커플러(PC)와, DC (-) 링크에 연결되어 전류를 일정 비율로 분로시키는 분로 저항(SR)과, 상기 분로 저항(SR)에 유기되어지는 전압을 동작 전압으로 인가 받아 구동되어 상기 포토 커플러(PC)에서 상기 스위칭소자(S1, S2, …)로 출력되는 신호를 차단하는 트랜지스터(TR)로 구성되어져 있다.FIG. 5 is a circuit diagram illustrating an overcurrent detection circuit of an inverter circuit according to an embodiment of the present invention, wherein a plurality of switching elements S1, S2,..., Capable of controlling the frequency of a load are switched so as to output a switching signal according to a micom signal. (S), a shunt resistor (SR) connected to the DC (-) link and shunts current at a constant rate, and a voltage induced by the shunt resistor (SR) is applied and driven as an operating voltage to drive the photo coupler ( And a transistor TR for interrupting the signal output from the PC to the switching elements S1, S2, ....
이와 같이 구성된 본 발명의 동작 및 작용 효과를 첨부한 도면 도 5를 참조하여 설명하면 다음과 같다.Referring to Figure 5 attached to the operation and effect of the present invention configured as described above is as follows.
먼저, 인버터 회로에 흐르는 전류가 과전류가 될 경우 분로 저항(SR)에 유기 되어지는 전압이 트랜지스터(TR)의 동작 전압(VEE)을 넘게 분로비를 결정한다.(일반적으로 0.7V)First, when the current flowing through the inverter circuit becomes an overcurrent, the shunt ratio is determined so that the voltage induced by the shunt resistor SR exceeds the operating voltage V EE of the transistor TR (generally 0.7V).
그러면, 스위칭소자(S1, S2, …)가 온, 오프를 반복하며 스위칭 될때 부하의 갑작스런 변동에 의해 과전류가 흐를 경우 트랜지스터(TR)의 베이스(B)와 이미터(E)단에 동작 전압(VBE) 이상의 전압이 인가되어 트랜지스터(TR)가 구동된다.(0.7V 이상의 전압이 인가되는 경우임)Then, when the switching elements S1, S2, ... are repeatedly switched on and off and the overcurrent flows due to a sudden change in the load, the operating voltage () at the base B and the emitter E of the transistor TR is applied. Transistor TR is driven by applying a voltage higher than V BE .
따라서, 트랜지스터(TR)의 컬렉터(C)단과 이미터(E)단이 도통되어지므로 포토 커플러(PC)의 출력 전압은 마이컴의 신호와는 무관하게 분로 저항(SR)의 (-)전압이 인가되므로 아랫상의 파워 디바이스는 마이컴의 신호와는 무관하게 오프시켜 과전류 발생시 회로를 보호한다.Therefore, since the collector C terminal and the emitter E terminal of the transistor TR become conductive, the output voltage of the photo coupler PC is applied with the negative voltage of the shunt resistor SR regardless of the signal of the microcomputer. Therefore, the lower power device is turned off regardless of the signal of the microcomputer to protect the circuit in case of overcurrent.
또한, 스위칭소자(S1, S2, …)의 게이트단의 전압이 소오스단의 전압보다 분로단에 유기되는 전압만큼 역전압으로 걸리기 때문에 스위칭소자(S1, S2, …)의 오프 타임(Off Time)이 빨라진다.In addition, since the voltage at the gate terminal of the switching elements S1, S2, ... is taken as the reverse voltage by the voltage induced in the shunt terminal rather than the voltage at the source terminal, the off time of the switching elements S1, S2, ... This is faster.
이상에서 설명한 바와 같이 본 발명은 최소의 회로 소자만을 사용하도록 회로를 단순화하여 인버터에 과전류가 흐르는 것을 방지함으로써, 원가가 절감되는 효과가 있다.As described above, the present invention simplifies the circuit so as to use only the minimum circuit elements, thereby preventing overcurrent from flowing through the inverter, thereby reducing the cost.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1019970067621A KR100265668B1 (en) | 1997-12-11 | 1997-12-11 | A circuit for detecting over-current in inverter |
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| Application Number | Priority Date | Filing Date | Title |
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| KR1019970067621A KR100265668B1 (en) | 1997-12-11 | 1997-12-11 | A circuit for detecting over-current in inverter |
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| KR19990048824A KR19990048824A (en) | 1999-07-05 |
| KR100265668B1 true KR100265668B1 (en) | 2000-09-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7113380B2 (en) | 2003-01-09 | 2006-09-26 | Samsung Electronics Co., Ltd. | Power supply device and control method thereof |
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| KR100332799B1 (en) * | 2000-01-20 | 2002-04-18 | 구자홍 | Over current protection circuit for inverter |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7113380B2 (en) | 2003-01-09 | 2006-09-26 | Samsung Electronics Co., Ltd. | Power supply device and control method thereof |
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