KR100282149B1 - Current limiting circuit of inverter washing machine - Google Patents
Current limiting circuit of inverter washing machine Download PDFInfo
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- KR100282149B1 KR100282149B1 KR1019980057090A KR19980057090A KR100282149B1 KR 100282149 B1 KR100282149 B1 KR 100282149B1 KR 1019980057090 A KR1019980057090 A KR 1019980057090A KR 19980057090 A KR19980057090 A KR 19980057090A KR 100282149 B1 KR100282149 B1 KR 100282149B1
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/10—Power supply arrangements, e.g. stand-by circuits
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F33/00—Control of operations performed in washing machines or washer-dryers
- D06F33/30—Control of washing machines characterised by the purpose or target of the control
- D06F33/47—Responding to irregular working conditions, e.g. malfunctioning of pumps
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F33/00—Control of operations performed in washing machines or washer-dryers
- D06F33/30—Control of washing machines characterised by the purpose or target of the control
- D06F33/48—Preventing or reducing imbalance or noise
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F34/00—Details of control systems for washing machines, washer-dryers or laundry dryers
- D06F34/14—Arrangements for detecting or measuring specific parameters
- D06F34/20—Parameters relating to constructional components, e.g. door sensors
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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
- H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
- H02M1/4208—Arrangements for improving power factor of AC input
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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
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
- H02M3/325—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal
- H02M3/335—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/337—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
- H02M3/3376—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration with automatic control of output voltage or current
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06F—LAUNDERING, DRYING, IRONING, PRESSING OR FOLDING TEXTILE ARTICLES
- D06F2103/00—Parameters monitored or detected for the control of domestic laundry washing machines, washer-dryers or laundry dryers
- D06F2103/44—Current or voltage
- D06F2103/46—Current or voltage of the motor driving the drum
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Abstract
본 발명은 인버터 세탁기의 전류제한회로에 관한 것으로, 종래에는 6.5A의 전류가 흐를때 전류감지저항에 유기되는 전압이 대단히 작으므로 이를 정확하게 센싱하기가 어렵고, 또한 정확한 전류의 센싱이 어려워짐에 따라 실제로 전류감지저항에 흐르는 전류가 6.5A가 아님에도 불구하고 마이크로컴퓨터가 6.5A로 잘못 인식하게 되며, 또한 기준전압을 낮게 설정할 수밖에 없어서 전류감지저항에 흐르는 전류의 양을 정확히 감지할 수 없어 제품의 신뢰성을 저하시키는 문제점이 있었다. 따라서,본 발명은 일측이 접지된 전류감지저항을 제1 저항을 통해 제1 오피앰프의 비반전단자에 접속하고, 상기 제1 오피앰프의 출력단을 피이드백하여 그 제1 오피앰프의 반전단자에 접속함과 아울러 제2 저항을 통해 제2 오피앰프의 비반전단자에 접속하며, 일측이 접지된 커패시터와 일측이 접지된 제3 저항을 접속하여 그 접속점을 상기 제2 오피앰프의 반전단자에 접속하고, 상기 제2 오피앰프의 출력단을 제4 저항을 통해 상기 제2 오피앰프의 반전단자에 접속하며, 상기 제2 오피앰프의 출력단을 제5 저항을 통해 제3 오피앰프의 비반전단자에 접속하고, 일측에 전원전압이 인가된 제6 저항을 일측이 각기 접지된 커패시터 및 제7 저항과 접속하여 그 접속점을 상기 제3 오피앰프의 반전단자에 접속하며, 그 제3 오피앰프의 출력단에서 출력신호가 발생하도록 구성함으로써 실제로 전류제한신호가 아님에도 불구하고 마이크로컴퓨터가 전류제한신호라고 인식하는 문제점을 개선하여 세탁기 구동시에 발생하는 오동작을 방지할 수 있고, 또한 피씨비설계시 발생할 수 있는 외부 전도 노이즈나 방사 노이즈에 대한 민감한 패턴에도 안전하게 동작할 수 있는 효과가 있다.The present invention relates to a current limiting circuit of an inverter washing machine. In the related art, since a voltage induced in a current sensing resistor is very small when a current of 6.5 A flows, it is difficult to accurately sense it, and also it is difficult to accurately sense current. In fact, even though the current flowing through the current sensing resistor is not 6.5A, the microcomputer incorrectly recognizes it as 6.5A, and because it has no choice but to set the reference voltage low, it cannot accurately detect the amount of current flowing through the current sensing resistor. There was a problem of lowering reliability. Accordingly, the present invention is connected to the non-inverting terminal of the first op amp via a first resistor connected to the grounded current sense resistor, the feedback of the output terminal of the first op amp to the inverting terminal of the first op amp And a non-inverting terminal of the second op amp via a second resistor, a capacitor connected to one side of the ground and a third resistor grounded on one side thereof, and a connection point thereof connected to the inverting terminal of the second op amp. The output terminal of the second op amp is connected to the inverting terminal of the second op amp through a fourth resistor, and the output terminal of the second op amp is connected to the non-inverting terminal of the third op amp through a fifth resistor. And a sixth resistor applied to a power supply voltage on one side thereof, connected to a capacitor and a seventh resistor grounded on one side thereof, and a connection point thereof connected to an inverting terminal of the third operational amplifier, and output from the output terminal of the third operational amplifier. Signal occurs It is possible to prevent the malfunction that occurs when the washing machine is driven by improving the problem that the microcomputer recognizes the current limit signal even though it is not actually the current limit signal, and also prevents external conduction noise or radiation noise that may occur when designing the PC. It also has the effect of being safe to operate on sensitive patterns.
Description
본 발명은 인버터 세탁기의 전류제한회로에 관한 것으로, 특히 세탁기 구동시에 발생하는 오류를 방지하여 보다 안전하게 구동할 수 있도록 한 인버터 세탁기의 전류제한회로에 관한 것이다.The present invention relates to a current limiting circuit of an inverter washer, and more particularly, to a current limiting circuit of an inverter washer that can be driven more safely by preventing an error occurring when the washing machine is driven.
일반적으로, 세탁기는 보통 정회전에서 역회전할 때 또는 역회전에서 정회전할 때 많은 전류를 발생시켜 아이피엠에 내장된 소자에 과도한 전류가 흘러 부품을 손상시키게 되는데, 이를 방지하기 위한 장치가 전류제한회로이며, 이와같은 종래 세탁기의 전류제한회로를 첨부한 도면을 참조하여 상세히 설명한다.In general, the washing machine usually generates a large amount of current when rotating in the forward rotation or in the forward rotation, so that excessive current flows to the elements embedded in the IPPM to damage the components. This is a limiting circuit, which will be described in detail with reference to the accompanying drawings.
도1은 종래 세탁기의 전류제한회로에 대한 구성을 보인 회로도로서, 이에 도시된 바와같이 일측이 접지된 제1 저항(R1)의 타측을 아이피엠의 네거티브단자(N)에 접속하고, 그 접속점을 제2 저항(R2)을 통해 오피앰프(IC1)의 비반전단자(+)에 접속하며, 일측에 전원전압이 인가된 제3 저항(R3)을 일측이 접지된 제4 저항(R4)과 접속하여 그 접속점을 일측이 접지된 커패시터(C1)와 상기 오피앰프(IC1)의 반전단자(-)에 접속하고, 상기 오피앰프(IC1)의 출력단을 제5 저항(R5)을 통해 에미터가 접지된 엔평트랜지스터(Q1)의 베이스에 접속하며, 상기 엔형트랜지스터(Q1)의 콜렉터를 전원전압이 일측에 인가된 저항(R6)에 접속하여 그 접속점에서 신호가 발생되도록 구성되며, 이와같이 구성된 종래 장치의 동작을 설명한다.1 is a circuit diagram illustrating a current limiting circuit of a conventional washing machine. As shown in FIG. 1, the other side of the first resistor R1 having one side grounded is connected to the negative terminal N of IPPM, and the connection point is The non-inverting terminal (+) of the operational amplifier IC1 is connected to the non-inverting terminal (+) of the op amp IC1 through the second resistor R2, and the third resistor R3 to which the power supply voltage is applied to one side thereof is connected to the fourth resistor R4 of which one side is grounded. The connection point is connected to the capacitor C1 having one side grounded and the inverting terminal (-) of the op amp IC1, and the output terminal of the op amp IC1 is grounded through the fifth resistor R5. The base of the conventional transistor Q1, and connects the collector of the N-type transistor Q1 to a resistor R6 to which a power supply voltage is applied to one side to generate a signal at the connection point. Describe the operation.
먼저, 저항(R1)을 통해 전류를 검출하는데, 포지티브측에서 전류가 흘러 아이피엠을 구동시키고 네가티브측으로 전류가 흐르면 상기 저항(R1)에 전압이 유기되어 이 전압의 값으로 흐르는 전류의 양을 감지한다.First, the current is detected through the resistor R1. When the current flows on the positive side to drive the IPM and when the current flows on the negative side, a voltage is induced in the resistor R1 to sense the amount of current flowing at the value of the voltage. do.
이때, 상기 저항(R1)은 무유도 저항으로 보통 0.05오옴/10와트 저항을 사용하며, 예를 들어, 6.5A에서 전류를 제한할 경우에 대하여 설명하면 다음과 같다.At this time, the resistor (R1) is a non-inductive resistance is usually used 0.05 Ohm / 10 Watt resistance, for example, the case of limiting the current at 6.5A as follows.
우선, 상기 저항(R1)에 6.5A가 흐르면 이 저항(R1)에 유기되는 전압은 6.5
그러면, 저항(R3),(R4)의 저항값을 분배하여 오피앰프(IC1)의 기준전압이 0.325V가 되도록 하여 상기 저항(R1)에 유기되는 전압이 0.325V가 넘으면 그 오피앰프(IC1)의 비반전단자(+)가 반전단자(-) 보다 높으므로 상기 오피앰프(IC1)의 출력이 고전위가 되고, 이에 의해 엔형트랜지스터(Q1)가 구동되어 마이크로컴퓨터(미도시)는 저전위인 전류제한신호를 감지하게 된다.Then, the resistance values of the resistors R3 and R4 are divided so that the reference voltage of the op amp IC1 is 0.325V. When the voltage induced by the resistor R1 exceeds 0.325V, the op amp IC1 Since the non-inverting terminal (+) of is higher than the inverting terminal (-), the output of the op amp IC1 becomes high potential, whereby the N-type transistor Q1 is driven so that the microcomputer (not shown) has a low potential current. The limit signal is detected.
여기서, 도2a와 도2b는 일반적인 인버터 세탁기 동작시의 아이피엠에 접속되는 네가티브단자(N)에 대한 파형을 나타내는데, 임의의 시간에 2번 네가티브단자(N)를 측정한 것으로 세탁기 동작시에 발생하는 네가티브단자(N)의 노이즈 레벨을 보여주고 있다.2A and 2B show waveforms of a negative terminal N connected to IPM in a typical inverter washing machine operation. The negative terminal N is measured twice at an arbitrary time. Shows the noise level of the negative terminal (N).
즉, 디비젼(Division)당 2V로 측정한 것으로 직류 그라운드에 비해 최대 4.8V가량 튀는 것을 알수 있다.In other words, it is measured at 2V per division and can be seen to swell up to 4.8V compared to DC ground.
이로인해 오피앰프(IC1)의 기준전압인 0.325V로 전류제한을 검지하는 것은 세탁기의 동작시 신뢰성을 확보할 수 없고 또한 외부 전도 노이즈나 방사 노이즈에 의해 실제 6.5A가 아닌데도 6.5A라고 마이크로컴퓨터가 잘못 인식하게 된다.As a result, detecting the current limit at 0.325V, the reference voltage of the op amp (IC1), cannot guarantee the reliability of the washing machine, and it is 6.5A even though it is not actually 6.5A due to external conduction noise or radiation noise. You will be mistaken.
즉, 상기와 같이 동작하는 종래 장치는 6.5A의 전류가 흐를때 전류감지저항에 유기되는 전압이 대단히 작으므로 이를 정확하게 센싱하기가 어렵고, 또한 정확한 전류의 센싱이 어려워짐에 따라 실제로 전류감지저항에 흐르는 전류가 6.5A가 아님에도 불구하고 마이크로컴퓨터가 6.5A로 잘못 인식하게 되며, 또한 기준전압을 낮게 설정할 수밖에 없어서 전류감지저항에 흐르는 전류의 양을 정확히 감지할 수 없어 제품의 신뢰성을 저하시키는 문제점이 있었다.That is, in the conventional device operating as described above, since the voltage induced in the current sensing resistor is very small when the current of 6.5 A flows, it is difficult to accurately sense it, and it is difficult to accurately sense the current. Even though the flowing current is not 6.5A, the microcomputer incorrectly recognizes it as 6.5A, and also has to set the reference voltage low so that the amount of current flowing through the current sensing resistor cannot be accurately sensed, which lowers the reliability of the product. There was this.
따라서, 상기와 같은 문제점을 감안하여 창안한 본 발명은 낮은 레벨의 전압을 정확하게 감지하여 세탁기 구동시에 발생하는 오동작을 방지할 수 있도록 한 인버터 세탁기의 전류제한회로를 제공함에 그 목적이 있다.Accordingly, an object of the present invention is to provide a current limiting circuit of an inverter washing machine that can accurately detect a low level of voltage and prevent a malfunction occurring when the washing machine is driven.
도1은 종래 인버터 세탁기의 전류제한회로에 대한 구성을 보인 회로도.1 is a circuit diagram showing a configuration for the current limiting circuit of the conventional inverter washing machine.
도2a,도2b는 도1에 있어서, 세탁기의 동작시 N단자의 파형도.2A and 2B are waveform diagrams of N terminals in the operation of the washing machine in FIG.
도3은 본 발명 인버터 세탁기의 전류제한회로에 대한 구성을 보인 회로도.Figure 3 is a circuit diagram showing a configuration for the current limiting circuit of the inverter washing machine of the present invention.
*****도면의 주요부분에 대한 부호의 설명********** Description of the symbols for the main parts of the drawings *****
IC1~IC3:오피앰프 C1,C2:커패시터IC1 to IC3: Op amp C1 and C2: Capacitor
R1~R8:저항R1 to R8: Resistance
상기와 같은 목적을 달성하기 위한 본 발명은 일측이 접지된 전류감지저항을 제1 저항을 통해 제1 오피앰프의 비반전단자에 접속하고, 상기 제1 오피앰프의 출력단을 피이드백하여 그 제1 오피앰프의 반전단자에 접속함과 아울러 제2 저항을 통해 제2 오피앰프의 비반전단자에 접속하며, 일측이 접지된 커패시터와 일측이 접지된 제3 저항을 접속하여 그 접속점을 상기 제2 오피앰프의 반전단자에 접속하고, 상기 제2 오피앰프의 출력단을 제4 저항을 통해 상기 제2 오피앰프의 반전단자에 접속하며, 상기 제2 오피앰프의 출력단을 제5 저항을 통해 제3 오피앰프의 비반전단자에 접속하고, 일측에 전원전압이 인가된 제6 저항을 일측이 각기 접지된 커패시터 및 제7 저항과 접속하여 그 접속점을 상기 제3 오피앰프의 반전단자에 접속하며, 그 제3 오피앰프의 출력단에서 출력신호가 발생하도록 구성한 것을 특징으로 한다.The present invention for achieving the above object is connected to the non-inverting terminal of the first op amp via a first resistor grounded current sense resistor, the feedback of the output terminal of the first op amp to the first It is connected to the inverting terminal of the op amp, and is connected to the non-inverting terminal of the second op amp through a second resistor, and a capacitor connected to one side of the op amp and a third resistor grounded to one side thereof is connected to the second op An inverting terminal of the amplifier, an output terminal of the second op amp through a fourth resistor, and an inverting terminal of the second op amp, and an output terminal of the second op amp through a fifth resistor; A non-inverting terminal of < RTI ID = 0.0 > 1, < / RTI > a sixth resistor having a supply voltage applied to one side thereof, and a capacitor and a seventh resistor whose one side is respectively grounded, and connecting its connection point to the inverting terminal of the third op amp. Op amp Characterized in that configured so that the output signal generated by the ryeokdan.
이하, 본 발명에 의한 인버터 세탁기의 전류제한회로에 대한 작용 및 효과를 첨부한 도면을 참조하여 상세히 설명한다.Hereinafter, the operation and effects of the current limiting circuit of the inverter washing machine according to the present invention will be described in detail with reference to the accompanying drawings.
도3은 본 발명 인버터 세탁기의 전류제한회로에 대한 구성을 보인 회로도로서, 이에 도시한 바와같이 일측이 접지된 전류감지저항(R1)을 제1 저항(R2)을 통해 제1 오피앰프(IC1)의 비반전단자(+)에 접속하고, 상기 제1 오피앰프(IC1)의 출력단을 피이드백하여 그 제1 오피앰프(IC1)의 반전단자(-)에 접속함과 아울러 제2 저항(R3)을 통해 제2 오피앰프(IC2)의 비반전단자(+)에 접속하며, 일측이 접지된 커패시터(C1)와 일측이 접지된 제3 저항(R5)을 접속하여 그 접속점을 상기 제2 오피앰프(IC2)의 반전단자(-)에 접속하고, 상기 제2 오피앰프(IC2)의 출력단을 제4 저항(R4)을 통해 상기 제2 오피앰프(IC2)의 반전단자(-)에 접속하며, 상기 제2 오피앰프(IC2)의 출력단을 제5 저항(R6)을 통해 제3 오피앰프(IC3)의 비반전단자(+)에 접속하고, 일측에 전원전압이 인가된 제6 저항(R7)을 일측이 각기 접지된 커패시터 (C2)및 제7 저항(R8)과 접속하여 그 접속점을 상기 제3 오피앰프(IC3)의 반전단자(-)에 접속하며, 그 제3 오피앰프(IC3)의 출력단에서 출력신호가 발생하도록 구성하며, 이와같이 구성한 본 발명의 동작을 설명한다.FIG. 3 is a circuit diagram illustrating a current limiting circuit of an inverter washing machine. As shown in FIG. 3, a current sense resistor R1 having one side grounded is connected to a first op amp IC1 through a first resistor R2. Is connected to the non-inverting terminal of +, the output terminal of the first op amp IC1 is fed back to the inverting terminal (-) of the first op amp IC1, and the second resistor R3 is connected. Is connected to the non-inverting terminal (+) of the second op amp (IC2) through the capacitor C1 of which one side is grounded and the third resistor (R5) of which one side is grounded, and the connection point is connected to the second op amp. The inverting terminal (-) of the IC2, the output terminal of the second op amp IC2 is connected to the inverting terminal (-) of the second op amp IC2 through a fourth resistor R4, A sixth resistor R7 connected to an output terminal of the second op amp IC2 to a non-inverting terminal + of the third op amp IC3 through a fifth resistor R6 and having a power supply voltage applied to one side thereof. Th The grounded capacitor C2 and the seventh resistor R8 are connected to each other, and the connection point thereof is connected to the inverting terminal (-) of the third op amp IC3, and at the output terminal of the third op amp IC3. The operation of the present invention configured to generate an output signal and thus configured will be described.
먼저, 인버터 세탁기 구동시 정,역회전이 발생하는 전류를 제한하는 전류가 아이피엠의 포지티브단자(P)로부터 아이피엠을 구동시키고 네가티브단자(N)로 흐르면서 감지저항(R1)에 전압이 유기된다.First, when the inverter washing machine is driven, a current limiting the current generated by the forward and reverse rotations drives the IPM from the positive terminal P of the IPM and flows to the negative terminal N, so that the voltage is induced in the sensing resistor R1. .
이때, 높은 입력임피던스와 낮은 출력임피던스를 가진 오피앰프(IC1)는 상기 감지 저항(R1)에 유기된 전압을 입력받아 1차적으로 노이즈성분을 걸러낸다.At this time, the op amp IC1 having a high input impedance and a low output impedance receives a voltage induced by the sensing resistor R1 to filter out noise components.
이렇게 함으로써, 도2에서 120KHZ마다 튀는 노이즈성분을 1차적으로 걸러낸 다음 이 걸러낸 소신호를 제2 오피앰프(IC2)를 통해 증폭한다.By doing so, the noise component bouncing out every 120 KHZ is first filtered in FIG. 2, and the small signal thus filtered is amplified by the second op amp IC2.
이때, 증폭도는 '1+ R4/R5' 이다.In this case, the amplification degree is '1 + R4 / R5'.
따라서, 상기 저항(R4),(R5)의 값을 조절하면 증폭도를 조절할 수 있는데, 보통 두저항(R4),(R5)의 값은 제2 오피앰프(IC2)의 구동전압을 5V로 구동시키므로, 예를 들어 10배 증폭한다고 하면 대략적으로 저항(R5)이 1K
으로 하면 저항비(R4/R5)가 '9.1'이 되므로 증폭도는 이 값에 '1'을 가산하므로 10.1배가 된다.In this case, the resistance ratio (R4 / R5) becomes '9.1', so the amplification degree is added to '1' to this value, thereby increasing to 10.1 times.
그러므로, 실제 전류감지저항(R1)에 낮은 레벨의 전압이 걸려도 이를 제2 오피앰프(IC2)에서 증폭한 다음에 이 증폭한 신호를 비반전단자(+)의 입력으로 하여 반전단자(-)의 기준전압과 비교하므로 감지저항(R1)에서 낮은 레벨의 전압을 감지하여도 정확하게 전류를 제한할 수 있다.Therefore, even if a low level voltage is applied to the actual current sensing resistor R1, it is amplified by the second op amp IC2 and the amplified signal is input to the non-inverting terminal (+). Compared with the reference voltage, the current can be accurately limited even if the sensing resistor R1 detects a low level voltage.
즉, 상기 전류감지저항(R1)에 유기되는 전압을 전압플로워로 동작하는 오피앰프(IC1)의 입력으로 입력받아 그대로 출력하고, 그러면 제2 오피앰프(IC2)에서 상기 제1 오피앰프(IC1)의 출력신호를 입력받아 이를 소정 증폭비로 증폭하여 출력한다.That is, the voltage induced by the current sensing resistor R1 is inputted to the input of the op amp IC1 operating as a voltage follower, and is output as it is. Then, the second op amp IC2 is output from the first op amp IC1. It receives the output signal of and amplifies it to a predetermined amplification ratio and outputs it.
그러면, 제3 오피앰프(IC3)는 상기 제2 오피앰프(IC2)의 출력신호를 입력받아 이를 저항(R7),(R8)에 의해 분배된 기준전압과 비교하여 그에 따른 출력신호를 마이크로컴퓨터에 출력함으로서 이 마이크로컴퓨터가 전압제한신호를 감지하게 된다.Then, the third op amp IC3 receives the output signal of the second op amp IC2 and compares it with the reference voltages distributed by the resistors R7 and R8 to compare the output signal to the microcomputer. By outputting, the microcomputer detects the voltage limit signal.
이상에서 상세히 설명한 바와같이 본 발명은 낮은 레벨을 감지함으로써 실제로 전류제한신호가 아님에도 불구하고 마이크로컴퓨터가 전류제한신호라고 인식하는 문제점을 개선하여 세탁기 구동시에 발생하는 오동작을 방지할 수 있고, 또한 피씨비설계시 발생할 수 있는 외부 전도 노이즈나 방사 노이즈에 대한 민감한 패턴에도 안전하게 동작할 수 있는 효과가 있다.As described in detail above, the present invention improves the problem that the microcomputer recognizes the current limit signal even though it is not the current limit signal by detecting a low level, thereby preventing malfunctions occurring when the washing machine is driven. It also has the effect of safe operation on sensitive patterns of external conduction noise or radiation noise that may occur during design.
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| KR1019980057090A KR100282149B1 (en) | 1998-12-22 | 1998-12-22 | Current limiting circuit of inverter washing machine |
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| KR1019980057090A KR100282149B1 (en) | 1998-12-22 | 1998-12-22 | Current limiting circuit of inverter washing machine |
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| US9306488B2 (en) | 2013-09-17 | 2016-04-05 | Samsung Electronics Co., Ltd. | Dual inverter system and method of controlling the same |
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