KR102129927B1 - Air-conditioner - Google Patents

Abstract

The present invention relates to an air conditioner, including an abnormality detection unit that detects whether an electric leakage is caused by an abnormality of power supplied from the outside, and inputs and compares the potential difference between live and ground, ground and neutral power, respectively, as a power signal. By determining the leakage current state according to the comparison result, the power is automatically cut off when a power failure occurs, and safety can be improved by preventing an electric shock caused by a short circuit.

Description

Air conditioner {Air-conditioner}

The present invention relates to an air conditioner, and relates to an air conditioner that senses current or voltage to prevent electric leakage.

The air conditioner is installed to provide a more comfortable indoor environment to humans by discharging cold and warm air into the room to create a comfortable indoor environment, adjusting the indoor temperature, and purifying the indoor air. In general, an air conditioner includes an indoor unit installed inside a heat exchanger, and an outdoor unit configured with a compressor and a heat exchanger to supply refrigerant to the indoor unit.

The air conditioner is separated and controlled by an indoor unit composed of a heat exchanger and an outdoor unit composed of a compressor and a heat exchanger, and the outdoor unit and the indoor unit are connected to a refrigerant pipe, so that the refrigerant compressed from the compressor of the outdoor unit is supplied to the heat exchanger of the indoor unit through the refrigerant pipe. The refrigerant exchanged in the heat exchanger of the indoor unit flows back into the compressor of the outdoor unit through the refrigerant pipe. Accordingly, the indoor unit discharges cold and hot air into the room through heat exchange using a refrigerant.

The air conditioner includes an inverter that controls on and off a plurality of switches to operate the compressor. In addition, it includes a configuration for applying a signal for controlling the on-off of a plurality of switches.

The air conditioner is installed in a building and operates by being connected to a power line in the building. Each building is equipped with an earth leakage breaker in preparation for the occurrence of overcurrent.

Korean Patent Publication No. 2007-0018741A describes an earth leakage breaker malfunction prevention circuit. It is configured to sense the voltage and current and short-circuit the power supply when surge is detected.

A short circuit breaker can block a short circuit in the Live and Neutral. The earth leakage breaker operates when an overcurrent occurs and cuts off the power supply to protect the electronic products in the building from overcurrent.

However, due to the nature of the building structure, live or neutral and ground may be shorted in the building. The live may be shorted to ground or the neutral may be shorted to ground due to installation errors or natural disasters. In a typical building, a circuit that prevents a short circuit between Live or Neutral and Ground is not installed when building a building.

In this situation, even if an overcurrent occurs, there is a problem that the earth leakage breaker cannot cut off the power.

If two of the three nodes of the power supply are short-circuited, electric current may be applied from the surface of the product to some of the electronic devices, and thus, there is a possibility of electric shock when the user contacts the electronic devices. In particular, in a situation in which an overcurrent occurs, a large voltage may be applied to the user, which may cause great damage.

Accordingly, electronic devices need to be prepared for such a short circuit or damage caused by overcurrent.

An object of the present invention relates to an air conditioner in an air conditioner, which protects a product from overcurrent and cuts off power when an electric leakage occurs.

The air conditioner according to the present invention includes: a power supply unit that supplies power; An abnormality detecting unit provided in the power supply unit to generate a first power signal according to a potential difference between live and ground, and a second power signal according to a potential difference between ground and neutral; A control unit comparing the first power signal and the second power signal and determining a state of operating power supplied through the power unit; It includes an output unit for outputting an operation state and a warning according to the control command of the control unit.

The abnormality detecting unit includes a first capacitor in which a potential difference between live and ground is stored, and a second capacitor in which a potential difference between ground and neutral is stored, and the first power signal from the voltage applied to the first capacitor and the second capacitor. And generating the second power signal.

The abnormality detecting unit is connected to both ends of the first capacitor, and is connected to both ends of the first OP amplifier and the second capacitor to attenuate the voltage stored in the first capacitor to output the first power signal to the control unit. , A second OP amplifier that attenuates the voltage stored in the second capacitor to output the second power signal to the control unit; And a plurality of resistors connected to the first OP amplifier and the second OP amplifier.

When the voltage values of the first power signal and the second power signal are both 0V, the control unit determines that a short circuit occurs.

The controller has little potential difference between the neutral and ground of the power source, and when the peak value of the potential difference between live and neutral is the first reference voltage, any one of the first power signal and the second power signal is the first reference voltage. If the other is 0V, it is determined as normal, and if both the first power signal and the second power signal are the first reference voltage, it is determined as an error.

When the potential difference between live and ground or neutral and ground is a second reference voltage, if the first power signal and the second power signal are both the second reference voltage, the controller determines that the control is normal and the first power signal. And if one of the second power signals is the second reference voltage and the other is 0V, it is determined as a short circuit.

The air conditioner according to the present invention configured as described above may detect an abnormality of power supplied to the air conditioner and automatically cut off the power when an overcurrent or a short circuit occurs.

According to the present invention, even when a short circuit occurs due to a wiring problem of a power line in a building, a notification is output and the power can be automatically cut off.

The present invention can prevent an electric shock accident due to a short circuit.

The present invention can prevent electric accidents that cannot be handled by an earth leakage breaker.

The present invention can minimize the heat loss in the circuit in detecting the abnormality of the power and turning off the power.

The present invention can prevent a circuit that detects a power failure due to noise from malfunctioning.

The present invention can prevent current from flowing in a reverse direction in a circuit for detecting a power failure.

In the present invention, safety can be improved by automatically shutting off the power through short circuit detection.

The present invention outputs a power failure, so that the user can identify and cope with the cause of the failure.

1 is a view showing the configuration of an air conditioner according to an embodiment of the present invention.
2 is a schematic diagram of the outdoor unit and the indoor unit of FIG. 1.
3 is a block diagram schematically showing the configuration of an air conditioner according to an embodiment of the present invention.
4 is a diagram briefly showing a configuration for preventing electric leakage of an air conditioner according to an embodiment of the present invention.
5 is a diagram briefly showing a circuit for preventing overcurrent detection and short circuit of the air conditioner of FIG. 4.
6 is a view referred to for explaining an abnormality detection using a voltage of an air conditioner according to an embodiment of the present invention.

Advantages and features of the present invention, and methods for achieving them will be clarified with reference to embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be implemented in various different forms, and only the embodiments allow the disclosure of the present invention to be complete, and common knowledge in the technical field to which the present invention pertains. It is provided to completely inform the person having the scope of the invention, and the present invention is only defined by the scope of the claims. The same reference numerals refer to the same components throughout the specification. In addition, the present invention specifies that the configuration of the control unit and other parts included in the air conditioner may be implemented by one or more processors (Micro Processor), and may be implemented by a hardware device.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

1 is a view illustrating the configuration of an air conditioner according to an embodiment of the present invention.

Referring to Figure 1, the air conditioner 50 according to an embodiment of the present invention, a plurality of indoor units (31 to 35), a plurality of outdoor units connected to a plurality of indoor units (21, 22), a plurality of It may include a remote control (41 to 45) connected to each of the indoor unit, and a controller 10 for controlling a plurality of indoor units and outdoor units.

The controller 10 is connected to the plurality of indoor units 31 to 36 and the plurality of outdoor units 21 and 22 to monitor and control its operation. At this time, the controller 10 may be connected to a plurality of indoor units to perform operation setting, lock setting, schedule control, group control, and the like for the indoor unit.

The air conditioner may be any of a stand type air conditioner, a wall-mounted air conditioner, and a ceiling type air conditioner, but for convenience of description, the ceiling type air conditioner will be described as an example. In addition, the air conditioner may further include at least one of a ventilation device, an air cleaning device, a humidifying device, and a heater, and may operate in conjunction with the operation of the indoor unit and the outdoor unit.

The outdoor units 21 and 22 operate a compressor and an outdoor heat exchanger provided to compress or heat exchange the refrigerant according to the setting to supply the refrigerant to the indoor units 31 to 35.

The outdoor unit (21, 22) is driven by the request of the controller 10 or the indoor unit (31 to 35), the number of operation of the outdoor unit and the operation of the compressor installed in the outdoor unit as the cooling / heating capacity is changed corresponding to the driven indoor unit The number is variable.

At this time, the outdoor units 21 and 22 are described on the basis of supplying refrigerant to each of the outdoor units and the connected indoor units, but the plurality of outdoor units are interconnected according to the connection structure of the outdoor unit and the indoor unit, and the refrigerant to the plurality of indoor units You can also supply

The indoor units 31 to 35 are connected to any one of the plurality of outdoor units 21 and 22, and receive coolant to discharge cold and hot air into the room.

At this time, the outdoor units 21 and 22 and the indoor units 31 to 35 are connected by a communication line to transmit and receive mutual data, and the outdoor units and indoor units are connected by a separate communication line to the controller 10 and operate according to the control of the controller 10 do.

The remote controllers 41 to 45 are respectively connected to the indoor unit, input a user's control command into the indoor unit, and receive and display the status information of the indoor unit. At this time, the remote control communicates by wire or wireless depending on the connection type with the indoor unit, and in some cases, a single remote control unit is connected to a plurality of indoor units, so that the settings of the plurality of indoor units may be changed through a single remote control input.

2 is a schematic view of the outdoor unit and the indoor unit of FIG. 1.

Referring to FIG. 2, the air conditioner 50 is largely divided into an indoor unit 31 and an outdoor unit 21.

The indoor unit 31 is disposed indoors to perform an air-conditioning/heating function, and an indoor fan 109a and an indoor fan 109a arranged on one side of the indoor heat exchanger 108 to promote heat dissipation of the refrigerant. And an indoor blower 109 made of an electric motor 109b for rotating the fan 109a.

At least one indoor heat exchanger 108 may be installed. The compressor 102 may be at least one of an inverter compressor and a constant speed compressor.

In addition, the air conditioner 50 may be configured with a cooler that cools the room, or may be configured with a heat pump that cools or heats the room.

The outdoor unit 21 includes a compressor 102 serving to compress the refrigerant, an electric motor 102b for driving the compressor, an outdoor heat exchanger 104 serving to dissipate the compressed refrigerant, and outdoor The outdoor fan 105, which is disposed on one side of the heat exchanger 104 and promotes heat dissipation of the refrigerant, and an outdoor fan 105 made of an electric motor 105b that rotates the outdoor fan 105a, and expands to expand the condensed refrigerant. Mechanism 106, a cooling/heating switching valve 111 for changing the flow path of the compressed refrigerant, and an accumulator 103 for temporarily storing the vaporized refrigerant to remove moisture and foreign substances, and then supplying the refrigerant at a constant pressure to the compressor. And the like.

Meanwhile, although the indoor unit 31 and the outdoor unit 21 are respectively shown in FIG. 2, the driving device of the air conditioner according to an embodiment of the present invention is not limited thereto, and the multi-type unit includes a plurality of indoor units and outdoor units. Of course, it can be applied to an air conditioner, an air conditioner having one indoor unit and a plurality of outdoor units.

3 is a block diagram schematically showing the configuration of an air conditioner according to an embodiment of the present invention.

As shown in Figure 3, the outdoor unit of the air conditioner is a sensor unit 140, a power supply unit 130, a compressor driving unit 161, a fan driving unit 162, a valve control unit 163, input and output unit 190, memory 120, a communication unit 150, and a control unit 110 for controlling overall operation.

Each part including the control unit 110 may be composed of one or a plurality of micro processors. In addition, each part of the sensor part, the power supply part, the compressor drive part, the fan drive part, the valve control part, the input/output part, the memory, and the communication part, as well as the control part, may each include at least one microprocessor.

The compressor driving unit 161, the fan driving unit 162, and the valve control unit 163 may be configured as one driving unit, and may be configured independently as described above.

The indoor unit may also include a sensor unit, a power supply unit, a fan driving unit, a valve control unit, an input/output unit, a memory, a communication unit, and a control unit.

The power supply unit 130 supplies operating power to the outdoor unit body. The power supply unit 130 rectifies and smooths the commercial power to be connected, and generates and supplies a voltage required by each unit. The power supply unit 130 prevents an inrush current and generates a constant voltage. Also, the power supply unit 130 may supply operating power to an indoor unit (not shown).

The input/output unit 190 includes at least one of a button, a switch, and a touch input means, input means (not shown) for inputting a user command or predetermined data, and display means (not shown) such as LCD, LED, OLED, etc. It may be configured, and may include a touchpad layered touch screen. The display means displays the driving setting or operation information in a combination of at least one of text, images, special characters, symbols, emoticons, and icons.

In addition, the input/output unit 190 includes an audio output unit (not shown) including a buzzer or speaker for outputting voice guidance, a predetermined warning sound, and an effect sound, and an audio input unit (not shown) including a microphone that receives a predetermined sound. It can contain.

The display means and the audio output section are output sections.

The memory 120 includes control data for controlling the operation, data for the operation mode, data sensed by the sensor unit 140, data transmitted and received through the communication unit 150, input data by the input/output unit 190, and output Data and data for determining whether an operation is abnormal are stored. The memory 120 stores data that can be read by a microprocessor, and a hard disk drive (HDD), solid state disk (SSD), silicon disk drive (SDD), ROM, RAM, CD-ROM , Magnetic tape, floppy disk, and optical data storage device.

The communication unit 150 includes at least one communication module to transmit and receive data in a wired or wireless communication method.

The communication unit 150 transmits and receives data to and from other devices, for example, an indoor unit, another outdoor unit, or a controller. In addition, the communication unit 150 may be connected to a predetermined network to communicate with an external server or terminal. The communication unit 150 transmits and receives data including communication modules such as Wi-Fi and WiBro as well as short-range wireless communication such as Zigbee, Bluetooth, and infrared.

The sensor unit 140 inputs data measured by including a plurality of sensors to the control unit 110. The sensor unit 140 includes a temperature sensor (not shown), a pressure sensor (not shown), a humidity sensor (not shown), a current sensor (not shown), and a voltage sensor (not shown).

A temperature sensor is installed in the refrigerant pipe to measure the temperature of the refrigerant pipe, and is installed in the heat exchanger to detect the outdoor temperature and the heat exchanger temperature, respectively.

The pressure sensor is installed in the refrigerant pipe and senses the pressure of the refrigerant flowing through the refrigerant pipe. The pressure sensor is respectively installed in the refrigerant inlet and outlet of the compressor 171, and is also installed in the heat exchanger.

The compressor driving unit 161 causes the compressor 171 to operate according to a control command from the control unit 110. At this time, the compressor driving unit 160 supplies the operating power to the motor of the compressor so that the compressor 171 operates at a specific operating frequency. Accordingly, when the low-temperature and low-pressure refrigerant flows, the compressor 171 compresses it and discharges it as a high-temperature and high-pressure refrigerant.

The fan driving unit 162 controls the driving of the motor provided in the fan 172 in response to a control command from the control unit 110 to rotate the fan. The fan driving unit 162 supplies operating power to the fan 172 to control it to rotate at a set rotational speed of the fan 172. The fan 172 is provided in the outdoor heat exchanger, and the refrigerant supplied from the compressor 171 flows into the heat exchanger and sucks and supplies outdoor air to exchange heat with outdoor air, and discharges the heat exchanged air to the outdoors. At this time, the fan 172 may be an inverter fan that can adjust the rotation speed. The fan 172 is composed of a motor and a fan, and the fan rotates as the motor operates under the control of the fan driving unit 162.

The valve control unit 163 may control opening/closing of the plurality of valves 173 provided in the outdoor unit 21 in response to a control command from the control unit 110 or control an opening degree and change a flow path of the refrigerant. At this time, the valve control unit 163 may be provided in each of the plurality of valves (173).

The control unit 110 applies a control command to the compressor driving unit 161 to operate the compressor 171 in response to data received from the indoor unit 31 or the controller 10, and a control command to control the fan 172. It is applied to the fan driving unit 162. In addition, the control unit 110 applies a control command to the valve control unit 163 to control the opening and closing of each of the plurality of valves 173 to change the flow path and flow rate of the refrigerant according to the operation mode.

The control unit 110 determines the states of the compressor 171, the refrigerant, and the fan 172 in response to data input from a plurality of sensors of the sensor unit 140, generates control commands correspondingly, and applies them to each driving unit do.

The control unit 110 communicates with the indoor unit 20 at predetermined time intervals through the communication unit 150 to receive data of each indoor unit, and also transmits data of the outdoor unit to the indoor unit 20.

In addition, the control unit 110 determines whether an operation state of each unit is normal, and generates an error based on data sensed by the sensor unit 140 and data stored in the memory 120. The control unit 110 may output an error code for the generated error.

If it is determined as an error, the control unit 110 determines whether driving is possible.

When the operation is possible, the control unit 110 performs a limited operation in which some performance is limited, and counts the number of times due to an error. The control unit 110 may initialize the number of counts corresponding to the type of the error or the time interval in which the error occurs, so that the operation continues.

The controller 110 counts the number of times of an error occurring during the limit operation, and if an error occurs more than the number of times set within the set time, the limit operation may be stopped and all operations may be terminated.

During the limited operation, the control unit 110 outputs a guide for the limited operation through the display means of the input/output unit or transmits data to the indoor unit through the communication unit, so that the limited operation state is displayed through the indoor unit.

In addition, the control unit 110 outputs an error when the operation is impossible due to an error or when the limited operation is stopped. The control unit 110 transmits error data to the indoor unit through the communication unit so that a notification about the error and the end of the operation is output through the indoor unit.

The indoor unit outputs an operation status, a notification, or an error message according to data received from the outdoor unit.

In addition, the control unit 110 may detect an abnormality with respect to the operating power supplied through the power supply unit 130 and cut off the power when an overcurrent or a short circuit is detected.

The control unit 110 may determine the operating power in a short circuit, overcurrent, or normal state through the input signal.

When a power supply abnormality is detected, the controller 110 may output the abnormality through the output unit. The control unit 110 outputs an abnormality through the display means or the audio output unit.

In addition, the control unit may transmit a notification of power failure to the indoor unit, the remote control, and the controller through the communication unit.

Accordingly, when a notification of a power failure is displayed on at least one of the remote controller, the controller, and the indoor unit, the user can recognize a wrong connection of the power, an installation failure, etc., and also check the power status in response to the power failure. It becomes possible.

4 is a diagram briefly showing a configuration for preventing electric leakage of an air conditioner according to an embodiment of the present invention.

3 and 4, the air conditioner, particularly the outdoor unit, is connected to the external power supply 131 through the power supply unit 130.

The power supply unit supplies operating power to the outdoor unit. The outdoor unit may supply the input operating power to the indoor unit through a power cable connected to the indoor unit. In some cases, the power supply unit is provided in the indoor unit, and the operating power may be supplied to the outdoor unit through the indoor unit.

The power supply unit 130 may include a power supply 131 (power source) and a noise filter (not shown). In addition, the power supply unit 130 may include a rectifying unit 133. In some cases, the rectifying unit may be included in the converter.

In addition, the power supply unit 130 includes an abnormality detection unit 132.

The rectifying unit 133 rectifies and smooths the power supplied from the power 131.

The noise filter removes noise included in the operating power supplied from the power source 131. In addition, the noise filter can cut off the surge voltage by filtering the power of a specific size or more.

The abnormality detecting unit 132 detects an abnormality in the operating power supplied.

The abnormality detecting unit 132 may detect a current or voltage of a predetermined size or more, and may detect a short circuit due to a short circuit of live, neutral, or ground of the operating power.

The abnormality detection unit 132 is connected to live, neutral, and ground of operating power, respectively, and inputs a first power signal for potential difference between live and ground and a second power signal between neutral and ground to the control unit 110, respectively. do.

Accordingly, the controller 110 may determine a power failure by comparing the input first and second power signals.

The control unit 110 outputs a notification of a power failure detected through the display unit 191 or the speaker 192 of the output unit. The control unit 110 may cause an operation stop due to a power failure or an inspection request according to a power failure to display a warning message and a warning image through the display 191, and output a warning sound through the speaker 192.

5 is a diagram briefly showing a circuit for preventing overcurrent detection and leakage of the air conditioner of FIG. 4.

As shown in FIG. 5, the abnormality detection unit 132 is configured to compare signals between live and ground, and ground and neutral.

The abnormality detection unit is connected to the control unit 110 and inputs a power signal according to a potential difference between live and ground, and ground and neutral, respectively. In addition, the abnormality detection unit inputs a first power signal according to a potential difference between live and ground, and a second power signal according to a potential difference between ground and neutral to the control unit.

The control unit compares the two power signals inputted from the abnormality detection unit and determines whether a short circuit, overcurrent, or normality is normal.

The abnormality detecting unit 132 is connected to the third capacitor C3 between the live L of the power supply and the ground G. The fourth capacitor C4 is connected to the ground G and the neutral N.

Also, the other end of the live is connected to the first diode D1, and the neutral N is connected to the second diode D2.

The other end of the first diode D1 is connected to the first capacitor C1, and the other end of the second diode D2 is connected to the second capacitor C2. The first capacitor and the second capacitor are interconnected, and are connected to ground (G).

The first capacitor C1 has one end connected to ground and the other end connected to the anode of the first diode. In addition, a first resistor R1 and a second resistor R2 are connected to both ends of the first capacitor.

A first voltage V1 is applied to both ends of the first capacitor. If the live and ground are short-circuited, the first voltage V1 is stored in the first capacitor C1.

One end of the first resistor R1 is connected to the first capacitor, and the other end is connected to the fifth resistor and the first OP amplifier OP1.

The second resistor R2 has one end connected to the first capacitor and the other end connected to the OP amplifier and the seventh resistor R7.

In the first OP amplifier OP1, a positive terminal is connected to the first resistor and the fifth resistor, and a negative terminal is connected to the second resistor and the seventh resistor. The seventh resistor is connected to the output terminal of the first OP amplifier, and constitutes a feedback circuit that applies the output value of the first OP amplifier to the negative input terminal.

When a signal is input through the first resistor and the second resistor, the first OP amplifier OP1 outputs the third voltage V3 with a predetermined gain to the voltage difference according to the ratio of the connected resistance value. The first OP amplifier may attenuate the first voltage V1 by 1/100 to output the third voltage V3.

The third voltage V3 is applied to the control unit as a first power signal for a potential difference between live and ground.

The third voltage V3 is input to the control unit 110 through the first RC filter 134.

The first RC filter 134 includes an eleventh resistor R11 and an eleventh capacitor C11. The eleventh resistor is connected to the output terminal of the OP amplifier, and the other end is connected to the eleventh capacitor and the controller. The eleventh capacitor is connected to the eleventh resistor and ground.

Meanwhile, one end of the second capacitor C2 is connected to the ground G, and the other end of the second capacitor C2 is connected to the anode of the second diode D2. In addition, a third resistor R3 and a fourth resistor R4 are connected to both ends of the second capacitor.

The second voltage V2 is applied to both ends of the second capacitor C2. If the ground and the neutral are short-circuited, the second voltage V2 is stored in the second capacitor C2.

One end of the fourth resistor R4 is connected to the second capacitor, and the other end is connected to the sixth resistor R6 and the second OP amplifier OP2.

One end of the third resistor R3 is connected to the second capacitor, and the other end of the third resistor R3 is connected to the second OP amplifier OP2 and the eighth resistor R8.

In the second OP amplifier OP2, the positive terminal is connected to the fourth and sixth resistors, and the negative terminal is connected to the third and eighth resistors. The eighth resistor is connected to the output terminal of the second OP amplifier, and constitutes a feedback circuit that applies the output value of the second OP amplifier to the input terminal. The other end of the sixth resistor is grounded.

The second OP amplifier OP2 outputs a fourth voltage V4 with a predetermined gain to a voltage difference according to a ratio of connected resistance values when signals are respectively input through the third and fourth resistors. The second OP amplifier may output the fourth voltage V4 by attenuating the second voltage V2 to 1/100.

The fourth voltage is applied to the control unit as a second power signal for a potential difference between neutral and ground.

The fourth voltage V4 is input to the control unit 110 through the second RC filter 135. The second RC filter 135 includes a twelfth resistor R12 and a twelfth capacitor C12. The twelfth resistor is connected to the output terminal of the OP amplifier, and the other end is connected to the twelfth capacitor and the control unit. The twelfth capacitor is connected to the twelfth resistor and ground.

The first and second RC filters attenuate noise of the voltage signal input to the control unit.

The abnormality detecting unit is connected to the first capacitor C1 connected between live and ground through a diode, and the second capacitor connected between ground and neutral through a diode, respectively, for a connection state between live and ground, and ground and neutral ( The voltage applied to both ends of C2), that is, the first voltage and the second voltage are measured through the first and second OP amplifiers and applied to the control unit as the third voltage and the fourth voltage.

In addition, the abnormality detection unit decompresses using a plurality of resistors provided with the voltage of the input power, and converts the voltage into a voltage recognizable by the control unit and inputs the voltage.

The third voltage V3 and the fourth voltage V4 output through the first detection amplifier, the first OP amplifier OP1, and the second OP amplifier OP2 are the first RC filter 134 and the second RC filter ( 135) is input to the control unit 110, and accordingly a noisy controlled voltage signal is input to the control unit.

Accordingly, the control unit 110 compares the two input voltage signals to determine the voltage states of live and ground, and ground and neutral. That is, the control unit determines whether the live, ground, and neutral are short-circuited, and the short circuit state accordingly.

If live and ground or ground and neutral are short-circuited, the first voltage V1 and the second voltage V2 are respectively stored in the first capacitor C1 and the second capacitor C2.

The first and second OP amplifiers respectively attenuate the first voltage and the second voltage by 1/100 and output the third voltage and the fourth voltage, and the third voltage and the fourth voltage are input to the control unit through a filter. .

The control unit may receive the third voltage and the fourth voltage as the first power signal and the second power signal, respectively, and determine whether the state of the power is short circuit.

The control unit 110 may cut off the operating power according to the determination result, generate a predetermined warning, and output it through the output unit.

In particular, if it is determined to be a short circuit, the control unit may output a warning so that the user does not contact the product. In the case of a short circuit, an electric current may flow to the surface of the product and an electric shock may occur, so the controller outputs a warning limiting the user's contact.

6 is a view referred to for explaining an abnormality detection using a voltage of an air conditioner according to an embodiment of the present invention.

As shown in FIG. 6, the control unit determines the state of the input power source based on the voltage signal input from the abnormality detection unit.

The abnormality detecting unit depressurizes the voltage between the live and ground, that is, the first voltage V1, the voltage between the ground and the neutral, and the second voltage V2 through the resistor and the OP amplifier, respectively, and the third voltage V3. And the fourth voltage V4 to the control unit.

In the case of a general commercial voltage, two cases occur. There is little potential difference between neutral and ground, and the difference between live and neutral is 220V, and there is a case where live and ground or neutral and ground each have a potential difference of 110V.

When considering both cases, the controller can determine the state of the power source as follows.

When both live and neutral are 0V, it is in a short circuit state.

Therefore, if either live or neutral is 220V, the other is 0V, this is normal. That is, if the live is 220V, the neutral is 0V, and if the live is 0V, it is normal that the neutral is 220V.

In addition, if the potential difference between live and neutral is 110V, it is normal, and if one of live or neutral is 110V and the other is 0V, it can be considered as a short circuit.

On the other hand, when the voltage difference between live and neutral is 220V, the peak value is 310V, and when the potential difference between live and ground or ground and neutral is 110V, the peak value is 155V. Accordingly, the power state can be determined based on 310V and 155V.

Accordingly, when the first voltage is 0V and the second voltage is 0V, 0V is also applied to the third voltage and the fourth voltage. When all voltages are sensed as 0V, the control unit 110 determines that the live and ground, the ground and the neutral are short-circuited, as an earth leakage state 281. This also applies to the case where the potential difference between live and neutral is 310 V (peak basis) and when the potential difference between live and ground and ground and neutral is 155 V (peak basis).

There is little potential difference between neutral and ground, and the potential difference between live and neutral is 220V.

When the first voltage is 0V, the second voltage is 310V, the third voltage is 0V, and the fourth voltage is 3.1V, the controller 110 determines that the normal state 282 is present. In addition, when the first voltage is 310V, the second voltage is 0V, the third voltage is 3.1V, and the fourth voltage is 0V, the controller 110 determines that the normal state 282 is present.

On the other hand, since the first voltage and the second voltage are both 310V, and the third voltage and the fourth voltage are 3.1V, the state 283 cannot be taken into account. If the voltage is detected as described above, the controller 110 may determine that it is an error. It can be judged as an abnormality in the circuit of the abnormality detection unit.

Since live and neutral cannot be 0 or 310V at the same time, the controller can determine the power state based on this.

When live and ground or neutral and ground have a potential difference of 110 V, respectively.

If the first voltage is 0 and the second voltage is 155V, the third voltage is 0, the fourth voltage is 1.55V, and the first voltage is 155V, the second voltage is 0V, and the third voltage is When 1.55V and the fourth voltage become 0V, the control unit determines that a short circuit is 284.

When all of the first to fourth voltages are 0V, the control unit determines that there is a short circuit.

Since both live and ground or neutral and ground each have a potential difference, if the two sums are not 310V, the control unit may determine that a short circuit occurs.

On the other hand, if the first voltage and the second voltage are 155V, and the third voltage and the fourth voltage are 1.55V, respectively, the controller may determine the normal state.

Accordingly, the controller determines the power state by receiving and comparing the potential difference between live, ground, and neutral power sources as a power signal through the abnormality detection unit in consideration of the number of power sources supplied.

Therefore, the present invention is live and ground. By detecting and comparing the voltage between the ground and the neutral, it is possible to detect not only a general short circuit, but also a short circuit state that is not detected by a short circuit breaker. Accordingly, the present invention can prevent an electric shock accident due to a short circuit.

Although all components constituting the embodiments of the present invention have been described as being combined and operated, the present invention is not necessarily limited to these embodiments. If within the scope of the object of the present invention, depending on the embodiment, all the components may be operated by selectively combining one or more.

The above description is merely illustrative of the technical idea of the present invention, and those skilled in the art to which the present invention pertains may make various modifications and variations without departing from the essential characteristics of the present invention.

10: controller
21, 22: outdoor unit 31 to 35: indoor unit
41 to 45: remote control
110: control unit 120: memory
130: power supply unit 132: abnormality detection unit
190: input and output unit

Claims (12)

A power supply unit that supplies power;
An abnormality detection unit provided in the power supply unit to generate a first power signal according to a potential difference between live and ground, and a second power signal according to a potential difference between ground and neutral;
A control unit comparing the first power signal and the second power signal and determining a state of operating power supplied through the power unit;
It includes an output unit for outputting the operation state and warning according to the control command of the control unit,
The abnormality detection unit,
A first capacitor in which a potential difference between live and ground is stored;
A second capacitor in which a potential difference between ground and neutral is stored;
A first OP amplifier connected to both ends of the first capacitor and attenuating a voltage stored in the first capacitor to output the first power signal to the control unit; And
A second OP amplifier connected to both ends of the second capacitor and attenuating the voltage stored in the second capacitor to output the second power signal to the control unit; Including,
Generating the first power signal and the second power signal from voltages applied to the first capacitor and the second capacitor,
The control unit may include at least one of a case in which there is no potential difference between the neutral and ground of the power source and a potential difference between live and neutral is the first reference voltage, and both the first power signal and the second power signal are the first reference voltage. In the case of an air conditioner characterized in that it is determined as an error. delete According to claim 1,
The abnormality detecting unit may further include a plurality of resistors connecting the first capacitor and the first OP amplifier, and connecting the second capacitor and the second OP amplifier. According to claim 1,
The air conditioner further includes a plurality of filters for removing noise included in each of the first power signal and the second power signal. The method of claim 3,
In the first OP amplifier, a positive terminal is connected to a first resistor of the plurality of resistors, a negative terminal is connected to a second resistor of the plurality of resistors, and an output value is fed back to input the first resistor and the first 2 connected to both ends of the first capacitor through a resistor,
In the second OP amplifier, a positive terminal is connected to a fourth resistor of the plurality of resistors, a negative terminal is connected to a third resistor of the plurality of resistors, and an output value is fed back to the input, and the third resistor and the third 4 Air conditioner characterized in that it is connected to both ends of the second capacitor through a resistor. According to claim 1,
The air conditioner of claim 1, wherein the first OP amplifier and the second OP amplifier attenuate the voltage by 1/100. According to claim 1,
The first capacitor is once connected to the live through the first diode,
The second capacitor has one end connected to the neutral through a second diode,
The first and second capacitors are air conditioners, characterized in that the other end is connected to the ground. According to claim 1,
The control unit is an air conditioner characterized in that when the voltage values of the first power signal and the second power signal are both 0 V, it is judged as a short circuit. According to claim 1,
When the controller has little potential difference between the neutral and ground of the power supply and the peak value of the potential difference between live and neutral is the first reference voltage,
If one of the first power signal and the second power signal is the first reference voltage and the other is 0V, it is determined that it is normal. delete According to claim 1,
When the potential difference between live and ground or neutral and ground is the second reference voltage,
And if the first power signal and the second power signal are both the second reference voltage, it is determined as normal. According to claim 1,
When the potential difference between live and ground or neutral and ground is the second reference voltage,
If one of the first power signal and the second power signal is the second reference voltage, and the other is 0V, the air conditioner is characterized in that it is determined as a short circuit.

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