• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An overcurrent blocking circuit for detecting an overcurrent due to overload of a secondary circuit of a refrigerator converter and destruction of a component, and for protecting an electric component by blocking a circuit applied to a compressor, a fan motor, a defrost heater, a high temperature, and the like when the overcurrent is detected. Such an over-current cut-off circuit includes: a microcomputer for detecting an error by sensing a voltage applied from a secondary side circuit of the refrigerator converter and outputting a predetermined control signal when the error is detected; When a predetermined control signal is applied from the microcomputer provided with a blocking circuit for turning off each of the first, second and third relay switches applied to the compressor, the fan motor and the defrost heater of the refrigerator; In the blocking circuit, the secondary output circuit of the converter is connected to the emitter terminal of the first transistor; The collector terminals of the first transistor are input to the base terminals of the second, third, and fourth transistors that are emitter grounded through the third, fourth, and fifth resistors, respectively; The collector terminals of the second, third, and fourth transistors are respectively connected to output terminals for outputting control signals from the microcomputer. Therefore, when detecting an overcurrent due to the overload of the converter and the destruction of parts, the circuit applied to the electric field can be blocked to protect the electric field.
    公开号:KR20000004808A
    申请号:KR1019980026327
    申请日:1998-06-30
    公开日:2000-01-25
    发明作者:정일식
    申请人:전주범；대우전자 주식회사；
    IPC主号:
    专利说明:

    Overcurrent cutoff circuit.
    BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an overcurrent blocking circuit, and more particularly, to an overcurrent blocking circuit for protecting an electric field by blocking a circuit applied to the electric field when detecting an overcurrent due to an overload of a secondary circuit of a refrigerator converter and destruction of a component.
    In general, when a refrigerator puts a liquid refrigerant into a cooling tube and releases it into the air, the refrigerator takes heat required for evaporation from the surroundings, and the refrigerant itself becomes a gas to cool the surroundings to perform cooling.
    The refrigerating cycle of the refrigerator includes a compressor for compressing and outputting a gaseous refrigerant, a condenser for cooling a refrigerant gas of high temperature and high pressure by air or the like, and a high pressure liquid state output from the condenser. Capillary tube for reducing the pressure and output the refrigerant, and the low-pressure liquid refrigerant flowing from the capillary tube is evaporator (Evaporator) to perform a cooling action by taking evaporation latent heat from the surroundings.
    And a fan (Fan) for discharging the cold air to discharge the cold air around the evaporator to the freezer compartment and the refrigerating chamber to cool the inside of the refrigerator, temperature control is performed as the drive / stop control of the fan and compressor.
    In addition, the defrost heater melts and removes the frost attached to the evaporator in accordance with a predetermined drive signal applied from the microcomputer.
    However, when the overload of the converter of the refrigerator or an overcurrent flows during the cooling operation of the refrigerator, there is a problem in that the electrical equipment (compressor, fan, defrost heater) of the refrigerator is damaged.
    The present invention was created to solve the above problems, the over-current to cut off the circuit applied to the electrical equipment to detect the overcurrent caused by the overload and component destruction in the secondary circuit of the refrigerator converter to protect the electrical equipment The purpose is to provide a blocking circuit.
    1 is a configuration diagram of an overcurrent blocking circuit according to the present invention;
    2 is a schematic circuit diagram according to a preferred embodiment of the present invention.
    <Description of the symbols for the main parts of the drawings>
    10 ... microcom 20 ... breaking circuit
    30 ... relay circuit 40 ... compressor
    50 ... fan motor 60 ... defrost heater
    70 ... converter 80 ... microcomputer power supply
    90.Relay circuit power supply
    The overcurrent blocking circuit of the present invention, which achieves the above object, includes a microcomputer for detecting an error by detecting a voltage applied from a secondary side circuit of a refrigerator converter, and outputting a predetermined control signal when an error is detected; When a predetermined control signal is applied from the microcomputer, the secondary output circuit of the converter is connected to the emitter terminal of the first transistor, and the collector terminal of the first transistor is emitter grounded through the third, fourth, and fifth resistors, respectively. And a blocking circuit input to the base terminals of the second, third, and fourth transistors to turn off each of the first, second, and third relay switches applied to the compressor, the fan motor, and the defrost heater of the refrigerator. It features.
    According to a feature of the present invention configured as described above, the overcurrent blocking circuit according to the present invention to protect the storage by blocking the circuit applied to the electrical equipment upon detection of the overcurrent due to the overload of the secondary circuit of the refrigerator converter and the destruction of parts. It becomes possible.
    Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.
    1 and 2, a microcomputer for detecting an error by detecting a voltage applied from a secondary circuit of a refrigerator converter 70 and outputting a predetermined control signal when an error is detected, according to the present invention. 10); When a predetermined control signal is applied from the microcomputer 10, the first (RY1), the second (RY2), and the third relay applied to the compressor 40, the fan motor 50, and the defrost heater 60 of the refrigerator. A blocking circuit 20 for turning off the switch RY3 is provided.
    In the blocking circuit 20, the secondary output circuit of the converter 70 is connected to the emitter terminal of the first transistor Q1, and the collector terminals of the first transistor Q1 are the third (R3) and the fourth (R4). And, are respectively input to the base terminals of the second (Q2), the third (Q3), and the fourth transistor (Q4) that are emitter grounded through the fifth resistor (R5); Collector terminals of the second (Q2), third (Q3), and fourth transistor (Q4) are connected to output terminals to which control signals are output from the microcomputer 10; A first R1 and a second resistor R2 connected to the secondary output circuit of the converter 70, a first C1, and a second capacitor C2 are included.
    When the microcomputer 10 outputs the control signal, the first Q1, the second Q2, the Q3, and the fourth transistor Q4 are turned on so that the first RY1 of the relay circuit 30 is turned on. ), The second RY2 and the third relay switch RY3 are turned off to cut off the circuits applied to the compressor 40, the fan motor 50, and the defrost heater 60.
    In more detail, the microcomputer 10 is connected to the output terminal of the secondary circuit of the converter 70 to detect an overcurrent caused by overload and component breakdown, and the point (A) connected to the first resistor R1. If the voltage of is detected lower than in the normal operation, it is determined that an error is detected and the error detection signal is output.
    One end of the point (A) is connected to the microcomputer power supply unit 80 and the relay circuit power supply unit 90.
    The blocking circuit 20 has an output of the secondary rectifier circuit of the converter 70 to which an AC power is applied and an emitter terminal of the first transistor Q1 through the second resistor R2 and the first capacitor C1. The collector terminal of the first transistor Q1 is grounded through the second capacitor C2, and one end of the emitter is connected to the second (R2), third (R3), and fourth resistors (R4). It is input to the base terminals of the grounded second (Q2), third (Q3), and the fourth transistor (Q4).
    The collector terminals of the second (Q2), the third (Q3), and the fourth transistor (Q4) are respectively connected to the compressor (40), the fan motor (50), and the defrost heater (60) to which control signals are output from the microcomputer (10). It is connected to the output terminal.
    Therefore, when the microcomputer 10 described above outputs an error detection signal through the output terminal, the first transistor Q1 of the blocking circuit 20 is turned on, thereby causing the second Q2, the third Q3, and the fourth. The transistor Q4 is turned on.
    Accordingly, the first relay switch RY1 connected to the compressor 40, the second relay switch RY2 connected to the fan motor 50, and the third relay switch RY3 connected to the defrost heater 60 are turned off. 40, the fan motor 50, and the respective circuits applied to the defrost heater 60 are blocked.
    The overload relay (OL-RY) of the compressor 40 prevents a failure in the event that an abnormal force is applied to the motor and the rotation speed drops or stops, and excessive current flows to the motor, causing the winding to be damaged or to break the insulation. It is a motor protection device installed in order to.
    The overcurrent cut-off circuit according to the present invention can automatically cut off the circuit applied to the electric field when detecting the overcurrent due to the overload of the secondary circuit of the refrigerator converter and the destruction of components, thereby protecting the electric field from the overcurrent.
    权利要求:
    Claims (1)
    [1" claim-type="Currently amended] A microcomputer that detects an error by detecting a voltage applied from the secondary circuit of the refrigerator converter and outputs a predetermined control signal when the error is detected;
    When a predetermined control signal is applied from the microcomputer, the secondary output circuit of the converter is connected to the emitter terminal of the first transistor, and the collector terminal of the first transistor is emitter through the third, fourth, and fifth resistors, respectively. And a blocking circuit input to the grounded second, third and fourth transistor base terminals to turn off each of the first, second and third relay switches applied to the compressor, the fan motor and the defrost heater of the refrigerator. An over-current blocking circuit, characterized in that
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1998-06-30|Application filed by 전주범, 대우전자 주식회사
    1998-06-30|Priority to KR1019980026327A
    2000-01-25|Publication of KR20000004808A
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019980026327A|KR20000004808A|1998-06-30|1998-06-30|Cutt curcuit of over-current|
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