KR200329383Y1 - Preventable circuit for over load of DC mator - Google Patents

Preventable circuit for over load of DC mator Download PDF

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Publication number
KR200329383Y1
KR200329383Y1 KR20-2003-0019456U KR20030019456U KR200329383Y1 KR 200329383 Y1 KR200329383 Y1 KR 200329383Y1 KR 20030019456 U KR20030019456 U KR 20030019456U KR 200329383 Y1 KR200329383 Y1 KR 200329383Y1
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KR
South Korea
Prior art keywords
signal
motor
circuit
overcurrent
overload
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KR20-2003-0019456U
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Korean (ko)
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김재천
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박정호
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Publication of KR200329383Y1 publication Critical patent/KR200329383Y1/en

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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
    • H02H7/08—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
    • 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
    • H02H3/08—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 excess current
    • 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
    • H02H7/0811—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 for dc motors
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
    • H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current

Abstract

본 고안은 DC모터를 사용하는 기계(적용 예; 라벨 자동 인출기)에서 DC모터의 과부하를 방지하는 회로에 관한 것이다.The present invention relates to a circuit for preventing overload of a DC motor in a machine using the DC motor (application example: label automatic dispenser).

본 고안에 따르면, Low/High 신호를 받아 DC모터를 제어하는 회로에 있어서, 아래에 기술하는 특징을 가진 회로를 추가함으로써 과부하를 방지하는 기능을 제공한다.According to the present invention, a circuit for controlling a DC motor in response to a low / high signal provides a function of preventing overload by adding a circuit having the characteristics described below.

본 고안은 DC모터에 공급되는 전류를 감지하여 기준전류보다 많은 전류가 흐를 때(과 부하가 걸렸을 때), 과전류 신호를 발생하여 논리회로부에 전달하면, 논리회로부에서 DC모터의 제어회로부에 멈춤 신호를 보내서 DC모터를 정지시킨다. 이에 따라 계속적인 과전류가 흐르는 것을 막음으로써 기기를 보호하는 것을 특징으로 한다.The present invention senses the current supplied to the DC motor and when more current flows than the reference current (overload is applied), when an overcurrent signal is generated and transferred to the logic circuit, the logic circuit stops at the control circuit of the DC motor. To stop the DC motor. This protects the device by preventing continuous overcurrent from flowing.

Description

DC모터의 과부하 방지회로 {Preventable circuit for over load of DC mator}DC motor overload protection circuit {Preventable circuit for over load of DC mator}

본 고안은 DC모터를 사용하는 다양한 기계에 적용할 수 있다. 실제 적용 예는 '라벨 자동 인출기(라벨을 손으로 뗄 때마다 자동으로 한 장씩 배출해 주는 기계 = 라벨공급기 = 라벨분리기)'에 사용되었는데, 본 고안의 회로를 추가하여 과부하에 의한 피해를 방지하는 기능을 갖게 되었다.The present invention can be applied to various machines using a DC motor. The actual application was used in the 'label automatic dispenser (machine that automatically ejects one sheet each time the label is released by hand = label feeder = label separator)', which adds a circuit of the present invention to prevent damage caused by overload. Got

종래에 DC모터를 사용하는 기계(예: 라벨 자동 인출기)에는 과부하에 대한 대책 회로가 없어서, 동작신호를 받고 모터가 동작하던 중에 여러 가지 이유로 과부하가 발생 하였을 경우에도 모터는 계속 동작하려고 하기 때문에, 모터나 제어회로에 과전류가 흘러서 PCB부품의 일부가 파손 되는 등의 문제가 발생하였다.Conventionally, a machine using a DC motor (e.g., an automatic label dispenser) does not have an overload protection circuit, so the motor will continue to operate even when an overload occurs for various reasons while receiving the operation signal. Problems such as the damage of some parts of the PCB due to the overcurrent flow to the motor or control circuit.

본 고안은 DC모터를 사용하는 기계가 정상상태 일 때는 원래의 신호(신호A)를 받아 신호대로 동작하게 하고, 비정상상태(과부하 발생시) 일 때는 원래의 신호에 상관없이 무조건 모터의 동작을 멈추는 신호를 발생하도록 하며, 이때 정상상태를 나타내는 LED1은 소등되고 과부하를 알리는 LED2는 점등되도록 한다.The present invention receives the original signal (signal A) to operate as a signal when the machine using the DC motor is in a normal state, and stops the operation of the motor unconditionally regardless of the original signal when it is in an abnormal state (overload occurs). In this case, LED1 indicating normal state is turned off and LED2 indicating overload is turned on.

도 1은 본 고안이 추가 되지 않은 모터 제어회로의 블럭도1 is a block diagram of a motor control circuit without adding the present invention

도 2는 본 고안이 추가 된 모터 제어회로의 블럭도2 is a block diagram of a motor control circuit to which the present invention is added.

도 3은 본 고안의 회로도3 is a circuit diagram of the present invention

도 4의 (a)는 NAND gate1과 Inverter1로 구성된 회로의 진리표(출력표)4 (a) is a truth table (output table) of a circuit composed of NAND gate1 and Inverter1.

(b)는 NAND gate2와 Inverter2고 구성된 회로의 진리표(출력표)(b) is the truth table (output table) of the circuit consisting of NAND gate2 and Inverter2.

본 고안은 크게 모터(3)에 공급되는 전류를 감지하는 과전류감지회로부(4)와 과전류감지회로부(4)에서 신호를 받아 과전류신호(신호B)를 발생하는 과전류신호발생회로부(5), 그리고 과전류신호(신호B)를 받아 모터제어회로부(2)에 멈춤신호를 주는 논리회로부(6)로 구성되어있다.The present invention is largely the over-current detection circuit portion 4 for sensing the current supplied to the motor (3) and the over-current signal generation circuit portion (5) for receiving the signal from the over-current detection circuit portion 4 to generate an overcurrent signal (signal B), and It consists of a logic circuit part 6 which receives an overcurrent signal (signal B) and gives a stop signal to the motor control circuit part 2.

이하, 본 고안의 실시예를 첨부한 도면에 의거하여 설명하면 다음과 같다.Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

도 2의 과전류감지회로부(4)는 도 3의 R1, R2, TR1, C1 으로 구성된다. R1은 과전류감지 저항이고, 그 값은 허용기준전류에 따라 정한다. R1에 허용기준전류 이상의 전류가 흐르면, TR1이 ON상태로 되어 R2를 통해 전류가 흐르게 된다. 이때 R2와 C1은 적분회로로써 순간적인 써지전류(surge current)를 막는 필터 역할을 하여 오동작을 막는다. R2를 통해 R3에 전류가 흐르면서 과전류신호발생회로부(5)에 신호를 주게된다.The overcurrent sensing circuit section 4 of FIG. 2 is composed of R1, R2, TR1, and C1 of FIG. R1 is an overcurrent sensing resistor and its value is determined according to the allowable reference current. If a current higher than the allowable reference current flows in R1, TR1 turns ON and a current flows through R2. At this time, R2 and C1 act as a filter to prevent the surge current (surge current) as an integrated circuit to prevent malfunction. As the current flows through R2 to R3, the overcurrent signal generating circuit unit 5 is signaled.

도 2의 과전류신호발생회로부(5)는 도 3의 LED2, R3, SCR1으로 구성된다. R3을 통해 전류가 흐르면, SCR1이 도통하게 되고, 그러면 LED2에 전류가 흐르면서 과부하신호(신호B)를 논리회로부(6)에 전달하게 된다.The overcurrent signal generation circuit part 5 of FIG. 2 is comprised by LED2, R3, SCR1 of FIG. When a current flows through R3, SCR1 conducts. Then, a current flows in LED2, which transmits an overload signal (signal B) to the logic circuit unit 6.

도 2의 논리회로부(6)는 도 3에서처럼 2개의 NAND gate와 2개의 Inverter로 구성된다. NAND gate1과 Inverter1로 구성된 논리회로는 신호A(센서회로부(1)의 신호)와 신호B(과전류신호발생회로부(5)의 신호)를 입력으로 하고 도4의 (a)와 같은 출력(신호C)값을 갖는다. NAND gate2와 Inverter2로 구성된 논리회로는 신호A(센서회로부(1)의 신호)와 신호B(과전류신호발생회로부(5)의 신호)를 입력으로 하고 도4의 (b)와 같은 출력(신호D')값을 갖는다. 즉, 논리회로부(6)는 과전류신호가 없을 때(신호B가 High일때)는 원래의 신호(신호A)를 그대로 출력하고, 이때 LED1도 원래의 신호(신호A)대로 소등/점등 되나, 과전류신호가 있을 때(신호B가 Low일때)는 원래의 신호(신호A)에는 관계없이 무조건 멈춤신호(High)를 출력하고, 이때 LED1은 무조건 소등되고 LED2는 점등되는 기능을 갖는다.The logic circuit part 6 of FIG. 2 is composed of two NAND gates and two inverters as shown in FIG. The logic circuit composed of NAND gate1 and Inverter1 inputs signal A (signal of sensor circuit section 1) and signal B (signal of overcurrent signal generating circuit section 5), and outputs as shown in Fig. 4A (signal C). ) Value. The logic circuit composed of NAND gate 2 and Inverter 2 inputs signal A (signal of sensor circuit section 1) and signal B (signal of overcurrent signal generating circuit section 5) as inputs and outputs as shown in Fig. 4B (signal D). Has a value That is, when there is no overcurrent signal (signal B is high), the logic circuit unit 6 outputs the original signal (signal A) as it is, and at this time, LED1 is turned off / on as the original signal (signal A). When there is a signal (when signal B is low), the stop signal High is unconditionally output irrespective of the original signal (signal A). At this time, LED1 turns off unconditionally and LED2 turns on.

본 고안에 의하면, DC모터를 사용하는 기계에 있어서, 과부하시에 모터를 정지시켜줌으로써 계속적인 과전류의 흐름을 막기 때문에 모터나 내부 회로기판(PCB)을 보호할 수 있다.According to the present invention, in a machine using a DC motor, the motor and the internal circuit board (PCB) can be protected because the overcurrent is prevented by stopping the motor when the motor is overloaded.

Claims (1)

DC모터를 사용하는 기계장치에 있어서, 모터(3)에 공급되는 과전류를 R1과 TR1으로 감지하고 R2와 C1을 삽입하여 써지전류(surge current)를 막음으로써 오동작을 방지하고, 감지된 과전류 신호를 R3와 SCR1이 계속적인 과전류 신호(Low)로 변환하여 NAND gate1과 NAND gate2에 전달하면(신호B),In a mechanical device using a DC motor, an overcurrent supplied to the motor 3 is detected as R1 and TR1, and a surge is prevented by inserting R2 and C1 to prevent surge current, and detecting the detected overcurrent signal. When R3 and SCR1 convert to continuous overcurrent signal (Low) and transfer to NAND gate1 and NAND gate2 (signal B), NAND gate1은 원래의 신호(신호A)를 Inverter1을 통해 또 다른 입력으로 하고, 두 신호값을 비교하여 신호를 출력하며(신호C), NAND gate2는 원래의 신호(신호A)를 또 다른 입력으로 하고, 두 신호값을 비교하여 Inverter2를 통해 신호를 출력하는(신호D'),NAND gate1 uses the original signal (signal A) as another input through Inverter1, compares the two signal values and outputs the signal (signal C), and NAND gate2 uses the original signal (signal A) as another input. And compares the two signal values and outputs a signal through Inverter2 (signal D '), 구성을 가진 회로로써, DC모터를 사용하는 기계장치가 정상상태 일 때는 원래의 신호(신호A)를 받아 신호대로 동작하게 하고, 비정상상태(과부하 발생시) 일 때는 원래의 신호에 상관없이 무조건 모터의 동작을 멈추는 신호를 발생하도록 하며, 이때 정상상태를 나타내는 LED1은 소등되고 과부하를 알리는 LED2는 점등되도록 하는 기능을 가지는 것을 특징으로 하는 과부하 방지회로.This circuit is configured to receive the original signal (signal A) and operate according to the signal when the machine using the DC motor is in a normal state, and to operate the motor unconditionally regardless of the original signal in the abnormal state (overload occurs). Generate a signal to stop the operation, wherein the LED1 indicating the normal state is turned off and the overload protection circuit, characterized in that the LED2 indicating the overload has a function to turn on.
KR20-2003-0019456U 2003-06-19 2003-06-19 Preventable circuit for over load of DC mator KR200329383Y1 (en)

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KR20-2003-0019456U KR200329383Y1 (en) 2003-06-19 2003-06-19 Preventable circuit for over load of DC mator

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