KR101891117B1 - Wrong wiring detection device and air conditioner including the same - Google Patents

Abstract

(R, S, T) connected to a three-phase power source, and a neutral wire connected simultaneously to a three-phase power source. Phase power source is determined based on the switching voltage determined based on the voltage flowing through the neutral line N and either one of the power lines R, S and T and the neutral line N, And a miswiring sensing unit for interrupting the power supplied from the power supply. Here, the miswiring sensing unit includes a rectifying unit for rectifying an alternating current flowing in any one of the power lines R, S, and T and the neutral line N, a voltage smoothing unit for smoothing the rectified voltage, Phase power source according to the switching voltage, and a switching unit for shutting off the power supplied from the three-phase power source in accordance with the determination signal of the mis-connection determination unit .

Description

[0001] Wrong wiring detection device and air conditioner including same [0002]

The present invention relates to a miswiring detecting apparatus for detecting miswiring of a three-phase power supply and an air conditioner including the same.

In general, the air conditioner may include an indoor unit that performs air conditioning of each room, and an outdoor unit that monitors status information of the indoor unit and controls the distribution and circulation of the refrigerant to the connected indoor unit.

The three-phase power source of R, S, T is applied to the air conditioner through the power supply terminal. When the power source line to which the three-phase power source is connected is incorrectly connected, the compressor rotates in the reverse direction when a reverse phase occurs, There is a problem that the unit malfunctions or breaks.

Also, when load unbalance occurs between R, S, and T phases, unbalanced current of N phase flows, and as load unbalance increases, N phase current also increases, and various problems such as overheating may occur.

In order to solve this problem, there has been used a method of applying a component having a high internal pressure so as not to cause component burnout even in case of a mis-wiring, or a method of not applying a power when a mis-wiring is used.

However, these conventional methods have a problem that a high standby power is generated due to a high power consumption of the resistor applied to the miswiring circuit, and the resistance of the resistor is increased due to high power consumption of the resistor, .

Therefore, there is a demand for a miswiring detection device capable of preventing part burnout due to heat while reducing power consumption in the future.

The present invention is directed to solving the above-mentioned problems and other problems. Another object of the present invention is to determine the switching voltage on the basis of the voltage flowing through any one of the power lines R, S and T and the neutral line N, judge whether the 3- The present invention provides a miswiring detection device and an air conditioner including the same that can prevent circuit burn-out due to mis-wiring by disconnecting the power supplied from an upper power supply.

Another object of the present invention is to determine a switching voltage for driving a relay switch based on a voltage flowing on a TN so as to determine an N-phase misconnection, thereby reducing power consumption and reducing false standby power And an air conditioner including the same.

The miswiring sensing apparatus according to an embodiment of the present invention includes power lines R, S, and T connected to three-phase power sources, a neutral line N simultaneously connected to three-phase power sources, a power line R , S, and T) and the voltage flowing through the neutral line (N), determines whether the three-phase power supply is misconnected according to the determined switching voltage, and disconnects the power from the three- And a wire connection sensing unit.

The miswiring sensing unit includes a rectifying unit for rectifying an alternating current flowing in any one of the power lines (R, S, T) and the neutral line (N), a voltage smoothing unit for smoothing the rectified voltage, And a switching unit for disconnecting the power supplied from the three-phase power supply according to a determination signal of the mis-connection determination unit .

Here, the rectifying unit is connected to a power line and a neutral line N, which are connected to a SMPS (Switched Mode Power Supply) power supply unit, of the three-phase power supply, and rectifies an alternating current flowing in a power line and a neutral line N connected to the SMPS power supply unit.

Further, the rectification part may include a bridge diode.

The voltage smoothing unit may include a capacitor connected to both ends of the rectifying unit.

Next, the switching voltage determining unit may determine the first switching voltage for the switching operation of the switching unit and the second switching voltage for the switching operation of the misjudgment unit.

Here, the switching voltage determining unit may include a first resistor connected to the voltage smoothing unit, a second resistor connected between the first resistor and the switching unit, and a second resistor connected to the node between the second resistor and the switching unit, And a fourth resistor having one end connected to a node between the third resistor and the misjudgment determining unit and the other end connected to the voltage smoothing unit.

Then, the miswiring determining unit compares the switching voltage applied from the switching voltage determining unit with a predetermined reference voltage, and if the switching voltage is larger than the reference voltage, the miswiring determining unit determines that the three-phase power supply is misconnected and turns off the switching unit.

Here, the miswiring determination unit may include a comparator that compares the switching voltage applied from the switching voltage determination unit with a predetermined reference voltage, and a transistor that is switched according to an output signal of the comparator.

At this time, if the switching voltage is greater than the reference voltage, the comparator outputs a high signal. If the switching voltage is not greater than the reference voltage, the comparator outputs a low signal. If the output signal of the comparator is a high signal, An operation is performed to turn off the switching unit, and if the output signal of the comparator is a low signal, the switching unit can be turned on by performing an off operation.

The switching unit may be a relay switch.

Also, the miswiring detection unit is connected to a power line and a neutral line (N) connected to a SMPS (Switched Mode Power Supply) power supply among three-phase power supplies, and a switching voltage based on a power line connected to the SMPS power supply unit and a voltage flowing in the neutral line You can decide.

The air conditioner according to an embodiment of the present invention includes power lines R, S and T connected to three-phase power sources, a neutral line N simultaneously connected to three-phase power sources, a power line R , S, and T) and the voltage flowing through the neutral line (N), determines whether the three-phase power supply is misconnected according to the determined switching voltage, and disconnects the power from the three- And may include a miswiring sensing device having a wire sensing portion.

Effects of the false wiring sensing apparatus and the air conditioner including the same according to the present invention will be described as follows.

According to at least one of the embodiments of the present invention, the switching voltage is determined based on the voltage flowing through any one of the power lines R, S, and T and the neutral line N, It is possible to prevent circuit burn-out due to N-phase erroneous connection by judging whether the wiring is wrong and disconnecting the power source from the 3-phase power source.

Further, according to at least one embodiment of the present invention, the switching voltage for driving the relay switch is determined based on the voltage flowing on the TN, and the N-phase misconnection is determined, thereby reducing the power consumption, Heat generation can be minimized.

Further scope of applicability of the present invention will become apparent from the following detailed description. It should be understood, however, that the detailed description and specific examples, such as the preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art.

FIG. 1 is a block diagram illustrating a miswired sensing apparatus according to the present invention.
2 is a circuit diagram for explaining a miswiring detecting apparatus according to the present invention.
3 is a circuit diagram for explaining a miswiring sensing unit of a miswiring sensing apparatus according to the first embodiment of the present invention.
FIGS. 4 and 5 are circuit diagrams for explaining the false detection process of FIG.
FIG. 6 is a block diagram illustrating a miswiring detection unit of a miswiring detection apparatus according to a second exemplary embodiment of the present invention. Referring to FIG.
7 is a circuit diagram for explaining a miswiring detection unit of a miswiring detection apparatus according to a second exemplary embodiment of the present invention.
8 is a circuit diagram for explaining the erroneous wire determining unit of Fig.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

FIG. 1 is a block diagram illustrating a miswiring sensing apparatus according to the present invention, and FIG. 2 is a circuit diagram illustrating a miswiring sensing apparatus according to the present invention.

1 and 2, the power conversion apparatus 1000 includes a rectifying unit 1100 for rectifying the AC power source 100, a converter unit (not shown) for boosting / reducing the DC voltage rectified by the rectifying unit 1100, An inverter unit 1400 for outputting a three-phase AC current, an inverter control unit 1500 for controlling the inverter unit 1400, a converter unit 1200 for controlling the inverter unit 1200, And a DC stage capacitor C between the inverter section 1400 and the inverter section 1400.

This inverter unit 1400 outputs a three-phase alternating current, and this output current is supplied to the motor 2000. Here, the motor 2000 may be a compressor motor that drives the air conditioner. Hereinafter, the motor 2000 is a compressor motor that drives the air conditioner, and the power inverter 1000 is a motor driving device that drives such a compressor motor.

However, the motor 2900 is not limited to a compressor motor, and can be used in various applications using frequency-varying alternating voltage, for example, AC motors such as refrigerators, washing machines, electric trains, automobiles, and vacuum cleaners.

The power conversion apparatus 1000 may further include a DC voltage detection unit B, an input voltage detection unit A, an input current detection unit D, and an output current detection unit E to drive the compressor motor have.

The power conversion apparatus 1000 receives the AC power from the system, converts the power, and supplies the converted power to the motor 2000.

The converter unit 1200 converts the input AC power supply 100 into a DC power supply. The converter unit 1200 may use a DC-DC converter that operates as a power factor control (PFC) unit. In addition, such a DC-DC converter can use a boost converter. Optionally, converter 1200 may be a concept including rectifier 1100. Hereinafter, the converter unit 1200 will be described by way of example using a step-up converter.

The rectifying unit 1100 receives and rectifies the single-phase AC power, and outputs the rectified power to the converter unit 1200 side. For this purpose, the rectifying unit 1100 can use a full-wave rectifying circuit using a bridge diode.

In this way, the converter unit 1200 can perform the power factor improving operation in the process of stepping up and smoothing the voltage rectified by the rectifying unit 1100.

The converter unit 1200 includes an inductor L1 connected to the rectifying unit 1100, a switching device Q1 connected to the inductor L1, a capacitor C connected in parallel with the switching device Q1, And a diode D1 connected between the switching element Q1 and the capacitor C. [

The converter unit 1200 is a step-up converter that can obtain an output voltage higher than the input voltage. When the switching device Q1 is turned on, the diode D1 is cut off and energy is stored in the inductor L1. The stored charge is discharged and an output voltage is generated at the output terminal.

Further, when the switching element Q1 is interrupted, the energy stored in the inductor L1 at the time of the switching element Q1 is added and is transferred to the output terminal.

Here, the switching device Q1 may perform a switching operation by a separate pulse width modulation (PWM) signal. That is, the PWM signal transmitted from the converter control unit 130 is applied to the base (or gate) terminal of the switching element Q1, so that the switching operation of the switching element Q1 can be driven by the PWM signal .

The switching element Q1 may use a power transistor, for example, an insulated gate bipolar mode transistor (IGBT).

The IGBT is a switching device having a structure of a metal oxide semi-conductor field effect transistor (MOSFET) and a bipolar transistor. The IGBT is a device capable of small driving power, high speed switching, high voltage conversion and high current density.

In this manner, the converter control unit 1300 can control the turn-on timing of the switching element Q1 in the converter unit 1200. [ Thus, the converter control signal Sc for the turn-on timing of the switching element Q1 can be output.

The converter control unit 1300 can receive the input voltage Vs and the input current Is from the input voltage detection unit A and the input current detection unit B, respectively.

The output voltage through the rectifying unit 1100 can be charged to the DC stage capacitor C or drive the inverter unit 1400. [

The input voltage detecting section A can detect the input voltage Vs from the input AC power supply 100. [ For example, it may be located at the front end of the rectifying part 1100.

The input voltage detecting section A may include a resistance element, an OP AMP, or the like for voltage detection. The detected input voltage Vs can be applied to the converter control unit 1300 in order to generate the converter control signal Sc as a discrete signal in the form of a pulse.

Next, the input current detection section D can detect the input current Is from the input AC power supply 100. [ Specifically, it may be located at the front end of the rectifying section 1100.

The input current detection unit D may include a current sensor, a current transformer (CT), a shunt resistor, or the like, for current detection. The detected input voltage Is may be applied to the converter control unit 1300 to generate the converter control signal Sc as a discrete signal in the form of a pulse.

The DC voltage detecting section B detects the pulsating voltage Vdc of the DC stage capacitor C. For such power detection, a resistance element, OP AMP, or the like can be used. The voltage Vdc of the detected DC stage capacitor C 1600 may be applied to the inverter control unit 1500 as a discrete signal in the form of a pulse and may be applied to the DC stage capacitor C 1600 The inverter control signal Si can be generated based on the DC voltage Vdc.

On the other hand, unlike the drawing, the detected DC voltage is applied to the converter control section 1300, and may be used to generate the converter control signal Sc.

The inverter unit 1400 includes a plurality of inverter switching elements Qa, Qb, Qc, Qa ', Qb', and Qc ', and supplies the smoothed DC power source Vdc to a predetermined Phase three-phase alternating-current power source, and output to the three-phase motor 2000.

Specifically, the inverter unit 1400 includes a pair of upper switching elements Qa, Qb, and Qc and lower switching elements Qa ', Qb', and Qc 'that are serially connected to each other, and a total of three pairs of upper and lower The switching elements can be connected to each other in parallel.

The switching elements Qa, Qb, Qc, Qa ', Qb', and Qc 'of the inverter section may use power transistors and may be, for example, an insulated gate bipolar transistor transistor (IGBT) can be used.

The inverter control unit 1500 can output the inverter control signal Si to the inverter unit 1400 in order to control the switching operation of the inverter unit 1400. [ The inverter control signal Si is generated based on the output current io flowing to the motor 2000 and the DC step voltage Vdc across the DC step capacitor C as a switching control signal of the pulse width modulation method And output. The output current io at this time can be detected from the output current detection unit E and the DC short voltage Vdc can be detected from the DC voltage detection unit B. [

The output current detection section E can detect the output current io flowing between the inverter section 1400 and the motor 2000. [ That is, the current flowing in the motor 2000 is detected. The output current detection unit E can detect all of the output currents ia, ib, ic of each phase or can detect the output currents of two phases using the three-phase balance.

The output current detection unit E may be located between the inverter unit 1400 and the motor unit 2000. For current detection, a current transformer (CT), a shunt resistor, or the like may be used.

The power source unit 100 applied to the power inverter 1000 of the air conditioner may be a three-phase power source (R, S, T).

Next, a miswiring detection device for detecting miswiring of a three-phase power source includes power lines (R, S, and T) connected to three-phase power sources, a neutral line (N) And a miswiring detection unit 1600 having a switching unit 1610 connected to a neutral line.

The miswiring detection unit 1600 determines a switching voltage based on a voltage flowing through any one of the power lines R, S, and T and the neutral line N. The miswiring sensing unit 1600 determines the switching voltage according to the determined switching voltage, It is possible to cut off the power supplied from the three-phase power source by judging whether or not the power source is connected.

For example, the miswiring detecting unit 1600 includes a rectifying unit for rectifying an alternating current flowing in any one of the power lines R, S, and T and the neutral line N, a voltage smoothing unit for smoothing the rectified voltage, Phase power source according to the switching voltage; and a control unit for controlling the switching of the three-phase power source according to a determination signal of the three-phase power source And a switching unit 1610 for shutting off the power supply.

The rectifying part of the miswiring sensing part 1600 may be connected to a power line and a neutral line N connected to a SMPS (Switched Mode Power Supply) power supply among three-phase power lines, a power line connected to the SMPS power line, May be rectified.

Here, the power supply line connected to the SMPS power supply unit may be a power supply line connected to the T phase power supply among the three-phase power supply.

The switching voltage determination unit of the miswiring detection unit 1600 may determine the first switching voltage for the switching operation of the switching unit 1610 and the second switching voltage for the switching operation of the misjudgment unit.

If the switching voltage is larger than the reference voltage, the erroneous wire connection determination unit 1600 determines that the three-phase power supply is misconnected The switching unit 1610 can be turned off.

Next, the switching unit 1610 of the miswiring detection unit 1600 may be a relay switch, but is not limited thereto.

For example, the relay switch may use a drive voltage of about 9V to about 13.5V, but it is not limited thereto.

Also, the miswiring detection unit 1600 is connected to a power supply line and a neutral line N connected to an SMPS (Switched Mode Power Supply) power supply unit among the three-phase power supply, a power supply line connected to the SMPS power supply unit, The switching voltage can be determined.

As described above, according to the present invention, the switching voltage is determined on the basis of the voltage flowing through any one of the power lines R, S, and T and the neutral line N, and whether or not the three- By cutting off the power applied from the 3-phase power supply, it is possible to prevent circuit burn-out due to N-phase miswiring.

Further, the present invention determines the switching voltage for driving the relay switch based on the voltage flowing on the TN, without judging the N-phase misconnection through the balance of the R, S, and T phase voltages, Thereby reducing standby power and minimizing the heat generation of resistance by lowering power consumption.

FIG. 3 is a circuit diagram for explaining a mis-wiring sensing apparatus according to the first embodiment of the present invention, and FIGS. 4 and 5 are circuit diagrams for explaining the mis-wiring sensing process of FIG.

As shown in FIG. 3, the miswiring sensing apparatus 1600 uses a method of determining an N-phase misconnection through balancing of R, S, and T phase voltages.

The power supply unit 100 having a three-phase power supply may be connected to the power inverter 1000 including the rectifier unit 1100 to supply power.

The miswiring detecting apparatus 1600 includes a voltage detecting unit 1620 connected to R, S, T, and N to detect a voltage of each phase, A determination unit 1630 for determining whether a connection is established, and a switching unit 1610 for switching according to a switching signal applied to the determination unit 1630.

Here, the voltage sensing unit 1620 may include a first resistor connected to the R phase, a second resistor coupled to S, a third resistor coupled to T, and a fourth resistor coupled to N .

The determination unit 1630 may include a light emitting device and a fifth resistor connected to both ends of the voltage sensing unit 1620.

Here, the light emitting element emits light when a mis-wiring occurs, and can display a mis-wiring error as an external light.

When the R, S, T, and N phases are normal, the voltage applied to the coil 1612 of the switching unit 1610 becomes 0 V, and the switch 1618 And may be located at the contact B 1616 to maintain the voltage supply to the power inverter 1000.

That is, it can be seen that V_coil = V _R + V _S + V _T = 0V, which indicates a three-phase equilibrium state, and V_TN = 220V.

Here, the V_coil the voltage coil applied to the coil (1612), V _R is the voltage across the R phase power line, V _S is the voltage, V _T applied to the S-phase power line is a voltage applied to the T-phase power line, V_TN is It is the voltage across TN.

When the R, S, T, and N phases are erroneous, the voltage applied to the coil 1612 of the switching unit 1610 becomes 220 V, the switch 1618 is placed at the contact A 1614, The supply of the voltage can be cut off.

That is, V_coil = V _R + V _S + V _T = 220V, and V_TN = 0V.

Here, the V_coil the voltage coil applied to the coil (1612), V _R is the voltage across the R phase power line, V _S is the voltage, V _T applied to the S-phase power line is a voltage applied to the T-phase power line, V_TN is It is the voltage across TN.

In this way, when the three-phase power source is a normal connection, as shown in FIG. 4, N voltage is applied to V1 according to the three-phase voltage balance, and N phases are directly connected to V2, so that the relay coil 1612 ), The relay switch 1618 maintains the B contact.

That is, in normal wiring, no current flows at 0 V across the relay coil, so that the relay switch can be in a normally closed state.

5, an N voltage is applied to the three-phase voltage equilibrium in V1 but an S voltage miswired to V2 is applied, and a voltage 220V is applied to both ends of the relay coil 1612 of the switching unit 1610 The relay switch 1618 is switched to the contact A and does not supply the V_TN.

That is, in the case of mis-wiring, S-N 220V is formed at both ends of the relay coil, the current flows and the contact opens, and the current flowing to the relay switch can go out to the R and T phases.

FIG. 6 is a block diagram illustrating a miswiring sensing unit of a miswiring sensing apparatus according to a second exemplary embodiment of the present invention. FIG. 7 illustrates a miswiring sensing unit of a miswiring sensing apparatus according to a second exemplary embodiment of the present invention Fig. 8 is a circuit diagram for explaining the erroneous wire determining unit of Fig. 7. Fig.

In the second embodiment of the present invention, as in the first embodiment of the present invention, without using the method of determining the N-phase misconnection through the balance of the R, S and T phase voltages, based on the voltage flowing on the TN, And determines the N-phase misconnection, thereby reducing the power consumption and minimizing the standby power reduction and the heat generation of the resistor.

6 and 7, a miswiring detecting apparatus for detecting miswiring of a three-phase power source includes power lines (R, S, and T) connected to three-phase power sources, And a miswiring detection unit 1600 having a switching unit 1610 connected to a neutral line of the N phase.

The miswiring detection unit 1600 determines a switching voltage based on a voltage flowing through any one of the power lines R, S, and T and the neutral line N. The miswiring sensing unit 1600 determines the switching voltage according to the determined switching voltage, It is possible to cut off the power supplied from the three-phase power source by judging whether or not the power source is connected.

For example, the miswiring detection unit 1600 may include a rectification unit 1640, a voltage smoothing unit 1650, a switching voltage determination unit 1660, and a switching unit 1610.

The rectifying unit 1640 rectifies an alternating current flowing in any one of the power lines R, S, and T and the neutral line N, and may include a bridge diode.

The rectifying unit 1640 is connected to a power supply line and a neutral line N connected to a SMPS (Switched Mode Power Supply) power supply unit of the three-phase power supply and is connected to a power supply line connected to the SMPS power supply unit and an AC flowing in the neutral line N It may be rectified.

Here, the power supply line connected to the SMPS power supply unit may be a power supply line connected to the T phase power supply among the three-phase power supply, but is not limited thereto.

The voltage smoothing unit 1650 can stabilize the voltage by smoothing the rectified voltage.

For example, the voltage smoothing unit 1650 may include a capacitor connected to both ends of the rectifying unit.

Next, the switching voltage determination unit 1660 can determine the switching voltage based on the smoothed voltage.

The switching voltage determiner 1660 may determine the first switching voltage for the switching operation of the switching unit 1610 and the second switching voltage for the switching operation of the misjudgment unit.

In one example, the switching voltage determination unit 1660 includes a first resistor 1732 connected to the voltage smoothing unit, a second resistor 1734 connected between the first resistor 1732 and the switching unit 1610, A third resistor 1736 having one side connected to a node between the resistor 1734 and the switching unit 1610 and the other side connected to the erroneous connection determining unit 1670 and a third resistor 1736 connected to the third resistor 1736, And a fourth resistor 1738 having one end connected to a node between the voltage smoothing unit 1670 and the voltage smoothing unit 1650 and the other end connected to the voltage smoothing unit 1650.

Here, the first switching voltage V _relay is V _relay = V _DC Rp / Rs, Rs = Rs1 + Rs2, Rp = Rp1 + Rp2 where V _DC is a voltage value across both ends of the voltage smoothing unit, Rs2 is a second resistance value of the switching voltage determination unit, Rp1 is a third resistance value of the switching voltage determination unit, and Rp2 is a fourth resistance value of the switching voltage determination unit) Can be calculated by a formula determined by the following equation.

Also, the second switching voltage V _shunt may be expressed as: V _shunt = V _relay x Rp2 / Rp1 + Rp2 where V _relay is a first switching voltage value and Rp1 is a third resistance value of the switching voltage determining section , And Rp2 is a fourth resistance value of the switching voltage determination unit).

Then, the erroneous wire determination unit 1670 can determine whether the three-phase power source is misconnected according to the switching voltage.

That is, the erroneous wire determination unit 1670 compares the switching voltage applied from the switching voltage determination unit 1660 with a preset reference voltage. If the switching voltage is greater than the reference voltage, the erroneous wire determination unit 1670 determines that the three- The power supply unit 1610 can be turned off to cut off the power supply.

If the switching voltage is not greater than the reference voltage, the erroneous wiring determining unit 1670 determines that the three-phase power source is normally connected The switching unit 1610 can be turned on to maintain the power supply.

For example, the miswiring determining unit 1670 may include a comparator 1672 and a transistor 1674 as shown in FIG.

Here, the comparator 1672 compares the switching voltage applied from the switching voltage determiner 1660 with a predetermined reference voltage, and the transistor 1674 can be switched according to the output signal of the comparator 1672. [

That is, the comparator 1672 outputs a high signal when the switching voltage is greater than the reference voltage, and outputs a low signal when the switching voltage is not greater than the reference voltage as a result of the comparison.

If the output signal of the comparator 1672 is high, the transistor 1674 turns on to turn off the switching unit 1610. If the output signal of the comparator 1672 is a low signal, the transistor 1674 performs an off operation So that the switching unit 1610 can be turned on.

Here, the reference voltage preset by the miswiring determining unit 1670 may be about 2.5V, but may vary variously according to the circuit design.

Next, the switching unit 1610 may cut off the power supplied from the three-phase power supply or maintain the power supply in accordance with the determination signal of the miswiring determination unit 1670. [

In one example, the switching unit 1610 may be a relay switch, but is not limited thereto.

The relay switch can use a drive voltage of about 9 V to about 13.5 V, but is not limited thereto.

The miswiring detection unit 1600 is connected to a power line and a neutral line N that are connected to a SMPS (Switched Mode Power Supply) power supply unit of the three-phase power supply, and a power line and a neutral line N The switching voltage can be determined based on the flowing voltage.

The driving operation of the second embodiment of the present invention will now be described.

For example, if the voltage on the T-N is 342 V due to miswiring, the voltage 342 V on the T-N may be input to the bridge diode, which is the rectifying part 1640 of the miswiring sensing part 1600.

The voltage output from the bridge diode, which is the rectification part 1640, can be 483.6 V obtained by multiplying 342 V by 1.414.

Subsequently, the switching voltage determination unit 1660 can determine the Vrelay voltage according to the voltage distribution of Rs (Rs1 + Rs2) and Rp (Rp1 + Rp2).

Here, the Vrelay voltage can be driven at about 9V to 13.2V, which may vary depending on the type of the relay switch.

Therefore, Vrelay = Vin (DC) x (Rp / Rs) = 483.6 x (38000/2000000) = 9.016V.

That is, the Vrelay voltage is a first switching voltage for the switching operation of the switching unit 1610, the first switching voltage V _relay is V _rel = V _DC Rp / Rs, Rs = Rs1 + Rs2, Rp = Wherein Rs1 is a first resistance value of the switching voltage determination unit, Rs2 is a second resistance value of the switching voltage determination unit, and Rp1 is a switching voltage of the switching voltage determination unit, Rp1 + Rp2, wherein V _DC is a voltage value across the voltage smoothing unit, Rs1 is a first resistance value of the switching voltage determination unit, And Rp2 is a fourth resistance value of the switching voltage determination unit).

Next, the switching voltage determination unit 1660 can determine the second switching voltage for the switching operation of the misjudgment determination unit 1670. [

Here, the comparator 1672 of the erroneous connection determining unit 1670 has a predetermined reference voltage of about 2.5 V, so that a voltage of about 2.5 V or more needs to be turned on, so that K (Cathode) of the transistor 1674 becomes A (Anode).

Therefore, the voltage applied to the comparator 1672 of the miswiring determination unit 1670 may be the Vshunt voltage.

Here, the Vshunt voltage may be a voltage obtained by dividing Rp1 and Rp2 by the Vrelay voltage.

That is, Vshunt = Vrelay x (Rp2 / Rp1 + Rp2) = 9.017 x (11000/38000) = 2.61V.

Therefore, the comparator 1672 of the erroneous wire determining unit 1670 is turned on to allow a current to flow, and the relay switch can also operate by flowing a current.

Vshunt voltage, a second switching voltage for the switching operation of the five connection determination unit 1670, a second switching voltage (V _shunt) is, V _shunt = V _relay × (Rp2 / Rp1 + Rp2), (wherein, V _relay Is a first switching voltage value, Rp1 is a third resistance value of the switching voltage determination section, and Rp2 is a fourth resistance value of the switching voltage determination section).

As described above, according to the present invention, the switching voltage is determined on the basis of the voltage flowing through any one of the power lines R, S, and T and the neutral line N, and whether or not the three- By cutting off the power applied from the 3-phase power supply, it is possible to prevent circuit burn-out due to N-phase miswiring.

Further, according to the present invention, the switching voltage for driving the relay switch is determined on the basis of the voltage flowing on the T-N to determine the N-phase erroneous connection, thereby lowering the power consumption and minimizing standby power reduction and resistance heat generation.

The features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

1000: power converter 1100: rectifier
1200: converter section 1300: converter control section
1400: Inverter section 1500: Inverter control section
1600: miswiring detection unit 1610:
1620: voltage detection unit 1630:
1640: Voltage rectification part 1650: Voltage smoothing part
1660: Switching voltage determination unit 1670:
2000: Motor

Claims (10)

A miswiring detection device for detecting a miswiring of a three-phase power supply,
Power lines (R, S, T) connected to the three-phase power source;
A neutral wire (N) connected to the three-phase power source at the same time; And,
Determines the switching voltage based on any one of the power lines (R, S, T) and the voltage flowing through the neutral line (N), determines whether the three-phase power source is misconnected according to the determined switching voltage, And an erroneous wire sensing unit for interrupting the power supplied from the upper power source,
The erroneous wiring detection unit may include:
A rectifying unit for rectifying alternating current flowing through any one of the power lines (R, S, T) and the neutral line (N);
A voltage smoothing unit for smoothing the rectified voltage;
A switching voltage determination unit for determining a switching voltage based on the smoothed voltage;
A misplacing determining unit for determining whether the three-phase power supply is misconnected according to the switching voltage; And,
And a switching unit for shutting off power supplied from the three-phase power supply according to the determination signal of the miswiring determination unit,
Wherein the switching voltage determination unit determines,
_Wherein a first switching voltage (V _relay ) for switching operation of the switching unit and a second switching voltage (V _shunt ) for switching operation of the misjudgment unit are determined. delete delete The apparatus of claim 1, wherein the switching voltage determination unit comprises:
A first resistor coupled to the voltage smoothing unit;
A second resistor coupled between the first resistor and the switching unit;
A third resistor having one side connected to a node between the second resistor and the switching unit and the other side connected to the misjudgment determining unit; And,
And a fourth resistor having one side connected to a node between the third resistor and the misjudgment determining unit and the other side connected to the voltage smoothing unit. The method of claim 4, wherein the first switching voltage (V _relay )
V _relay = V _DC Rp / Rs, Rs = Rs1 + Rs2, Rp = Rp1 + Rp2 where V _DC is a voltage value across both ends of the voltage smoothing unit, Rs1 is a first resistance value of the switching voltage determination unit, Wherein Rs2 is a second resistance value of the switching voltage determination unit, Rp1 is a third resistance value of the switching voltage determination unit, and Rp2 is a fourth resistance value of the switching voltage determination unit. Connection detection device. The method of claim 5, wherein the second switching voltage (V _shunt )
_{V shunt = V relay × (Rp2} / Rp1 + Rp2) ( wherein, V _relay is a first switching voltage, Rp1 is the third resistance determined portion of the switching voltage, Rp2 is the fourth resistance ¹ portion determines the switching voltage ) Of the battery is calculated by a formula determined by the following formula. The apparatus according to claim 1,
Wherein when the switching voltage is greater than the reference voltage, it is determined that the three-phase power supply is misconnected and the switching unit is turned off, Sensing device. The apparatus according to claim 1,
A comparator for comparing a switching voltage applied from the switching voltage determiner with a preset reference voltage; And,
And a transistor which is switched according to an output signal of the comparator. 9. The apparatus of claim 8,
And outputs a low signal when the switching voltage is greater than the reference voltage and outputs a low signal when the switching voltage is not greater than the reference voltage,
The transistor comprising:
And turns off the switching unit if the output signal of the comparator is a high signal and turns off the switching unit if the output signal of the comparator is a low signal. The air conditioner according to any one of claims 1 to 9, further comprising a miswiring sensing device.

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