JP7308730B2 - air conditioner - Google Patents

Description

The present invention relates to a separator type air conditioner having an indoor unit and an outdoor unit.

Conventional air conditioners are equipped with a DC fan motor with a rated voltage of 140V for models that are powered by a commercial power supply of 100V AC (100V models), and a DC fan motor with a rated voltage of 280V for models that are powered by a commercial power supply of 200V AC (200V models). It was common to mount a motor. However, there are cases where it is desired to mount a DC fan motor with a rated voltage of 280V even in a 100V model, such as an air cleaning air conditioner, to rotate the indoor fan at high speed. In such a case, a voltage doubler circuit is installed in the air conditioner, and after converting the input voltage of AC 100V to DC 140V, the voltage is doubled to DC 280V by the voltage doubler circuit to drive a DC fan motor with a rated voltage of 280V. done.

Further, Patent Document 1 discloses a power supply device that drives a motor with a rated voltage of 280V and includes a voltage doubler circuit. The power supply device of Patent Document 1 operates the voltage doubler circuit when AC 100V is input, and disables the voltage doubler circuit when AC 200V is input.

Japanese Patent No. 6297999

In a 100V model air conditioner that drives a DC fan motor with a rated voltage of 280V, if a user mistakenly applies AC200V power and the voltage doubler circuit operates undesirably, a high voltage of DC560V or more is generated, There is a risk of exceeding the rated voltage of the parts and causing damage to the parts.

In order to prevent such an undesired operation of the voltage doubler circuit, conventionally, a 100V model air conditioner is equipped with an erroneous application detection circuit to issue a warning when 200V AC power is erroneously applied. Specifically, the applied voltage value is detected by the hardware on the indoor unit side, and the application voltage value is determined by the software of the microcomputer, thereby performing erroneous application detection. When the erroneous application of the AC200V power source is detected, a warning sound or the like is emitted to warn the user of the erroneous application of the power source.

However, such an erroneous application detection circuit may not operate properly, or may cause erroneous detection due to software bugs. As a result, it may not be possible to reliably prevent the undesirable operation of the voltage doubler circuit.

Further, the power supply circuit of Patent Document 1 determines whether the applied power is 100V or 200V, and switches between operation/non-operation of the voltage doubler circuit according to the determination. However, like the erroneous application detection circuit described above, there is a possibility that the judgment circuit that judges the applied voltage may not operate properly, or an erroneous judgment may occur due to a software bug. Therefore, when 200 V is applied, the voltage doubler circuit may operate undesirably.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an air conditioner that can more reliably prevent undesirable operations of a voltage doubler circuit.

In order to solve the above problems, an air conditioner of the present invention includes an indoor unit and an outdoor unit, and includes an indoor fan motor which is a DC fan motor with a rated voltage of 280 V, and an AC 100 V. Sometimes, the applied AC 100V is converted to DC 140V, the converted DC 140V is doubled to DC 280V by a voltage doubler circuit, and can be supplied to the indoor fan motor, and the voltage doubler circuit is switched between operation and non-operation. a DC power supply circuit having a switching means capable of switching; a first determination unit that determines whether the applied power is AC 100 V or AC 200 V; a control unit that controls the switching means to operate the voltage doubler circuit when the voltage is 100V AC, and controls the switching means to disable the voltage doubler circuit when the applied power is 200V AC. The control unit is provided in the indoor unit, the first determination unit is provided in the outdoor unit, and the first determination unit transmits the determination result to the control unit by serial communication. It is characterized by

According to the above configuration, since the first determination unit is provided in the outdoor unit instead of the indoor unit, the determination result of the erroneous application (application of AC 200 V) by the first determination unit is transmitted by serial communication to the control unit on the indoor unit side. is transmitted to In this case, even if the first determination unit does not operate properly or an erroneous detection occurs due to a software bug, the control unit can recognize malfunction of the first determination unit. That is, even when the first determination unit malfunctions, the voltage doubler circuit can be rendered inoperative, and unwanted operation of the voltage doubler circuit can be more reliably prevented.

Further, the air conditioner includes a second determination unit that is provided in the indoor unit and determines whether the applied power is AC 100 V or AC 200 V, and the control unit comprises the first determination unit and the When both determination results of the second determination unit are AC100V, it is determined that AC100V has been applied, the switching means is controlled to operate the voltage doubler circuit, and the first determination unit and the second determination unit When at least one of the determination results is AC 200V, it is determined that AC 200V has been applied, and the switching means can be controlled to disable the voltage doubler circuit.

According to the above configuration, both the first determination unit on the outdoor unit side and the second determination unit on the indoor unit side can detect erroneous application of power, and have a double protection function against erroneous application of power. becomes.

Further, in the above air conditioner, when it is determined that 200 V AC is applied, the control section may determine that it is an erroneous application, and cause the indoor unit to issue an erroneous application detection warning.

According to the above configuration, when erroneous application of power (application of AC 200V) is detected, it is possible to notify the user with a warning.

Further, in the above air conditioner, when it is determined that AC 100 V is applied, the DC power supply circuit supplies DC 280 V doubled by the voltage doubler circuit to the indoor fan motor, and determines that AC 200 V is applied. When applied, the applied AC 200V can be converted into DC 280V and supplied to the indoor fan motor.

According to the above configuration, the indoor fan motor can be properly driven regardless of whether AC 100V or AC 200V is applied.

In the air conditioner of the present invention, even if the first determination unit does not operate properly or an erroneous detection occurs due to a software bug, the control unit can recognize the malfunction of the first determination unit. Even when the first determination unit malfunctions, the undesirable operation of the voltage doubler circuit can be more reliably prevented.

1 is a schematic configuration diagram of an air conditioner according to Embodiment 1. FIG. 2 is a configuration diagram showing a drive control system for an indoor fan motor in the air conditioner according to Embodiment 1; FIG. FIG. 3 is a circuit diagram showing the configuration of a DC power supply circuit in the drive control system of FIG. 2, and shows the operation of the voltage doubler circuit; FIG. 3 is a circuit diagram showing the configuration of a DC power supply circuit in the drive control system of FIG. 2, and shows a non-operating state of the voltage doubler circuit; 3 is a diagram showing a schematic configuration of an applied voltage detection circuit in the drive control system of FIG. 2; FIG. FIG. 10 is a configuration diagram showing a drive control system for an indoor fan motor in the air conditioner of Embodiment 2; 9 is a flow chart showing a startup sequence of an indoor fan motor in the air conditioner according to Embodiment 2. FIG.

[Embodiment 1]
BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram of an air conditioner 10 according to Embodiment 1. As shown in FIG.

The air conditioner 10 is composed of an indoor unit 100 and an outdoor unit 110 . On the path of the refrigeration cycle in the air conditioner 10, an indoor heat exchanger 101 is provided on the indoor unit 100 side, and a compressor 111, an outdoor heat exchanger 112, a four-way valve 113 and an expansion valve are provided on the outdoor unit 110 side. 114 are provided.

The heating/cooling operation of the air conditioner 10 is switched by changing the circulation direction of the refrigerant with the four-way valve 113 (FIG. 1 shows the state during the heating operation). That is, during heating operation, the refrigerant circulates in the order of the compressor 111, the indoor heat exchanger 101, the expansion valve 114, the outdoor heat exchanger 112, and the compressor 111, and the indoor heat exchanger 101 is the condenser and the outdoor heat exchanger. 112 functions as an evaporator. On the other hand, during cooling operation, the refrigerant circulates in the order of the compressor 111, the outdoor heat exchanger 112, the expansion valve 114, the indoor heat exchanger 101, and the compressor 111, and the outdoor heat exchanger 112 is the condenser and the indoor heat exchanger. 101 functions as an evaporator.

Further, the indoor unit 100 is provided with an indoor fan 102 for sending out the air heat-exchanged by the indoor heat exchanger 101 indoors, and the outdoor unit 110 is provided with an indoor fan 102 for sending air to the outdoor heat exchanger 112. outdoor fan 115 is provided.

In the air conditioner 10 according to Embodiment 1, the indoor fan motor 120 (see FIG. 2) for the indoor fan 102 is a DC fan motor with a rated voltage of 280V. Therefore, when operating the air conditioner 10 with a commercial power supply of AC 100V, it is necessary to double the voltage of DC 140V to DC 280V in addition to AC/DC conversion of the applied AC 100V to DC 140V.

FIG. 2 is a configuration diagram showing a drive control system for indoor fan motor 120 in air conditioner 10 according to Embodiment 1. As shown in FIG. 3A and 3B are circuit diagrams showing the configuration of the DC power supply circuit 130 included in FIG. 2. FIG. 3A shows the operation of the voltage doubler circuit, and FIG. 3B shows the non-operation of the voltage doubler circuit.

As shown in FIG. 2, the air conditioner 10 includes an indoor fan motor 120, a DC power supply circuit 130, and an indoor controller 140 on the indoor unit 100 side, and an applied voltage detection circuit 150 and an indoor controller 140 on the outdoor unit 110 side. An outer control section 160 is provided.

A power supply (for example, a commercial power supply of 100 V AC) for the air conditioner 10 is applied on the indoor unit 100 side and supplied to the indoor fan motor 120 via the DC power supply circuit 130 . DC power supply circuit 130 includes a rectifying circuit, a smoothing circuit, and a voltage doubler circuit. Specifically, the DC power supply circuit 130, as shown in FIG. and a voltage doubler circuit. Furthermore, the DC power supply circuit 130 has a selector switch 135 as switching means for switching operation/non-operation of the voltage doubler circuit.

In the DC power supply circuit 130 , the switch 135 is turned on/off by a control signal from the indoor controller 140 . That is, the indoor-side control unit 140 corresponds to the control unit described in the claims. Then, as shown in FIG. 3A, when the selector switch 135 is on, the voltage doubler circuit operates. In this case, for example, when a commercial power supply of AC 100V is applied to the air conditioner 10, the AC 100V is converted to DC 140V by the rectifying circuit and smoothing circuit of the DC power supply circuit 130, and the DC 140V is doubled to DC 280V by the voltage doubler circuit. . As a result, the indoor fan motor 120 with the rated voltage of 280 can be properly operated by the commercial power supply AC 100V.

However, if commercial power of 200 V AC is erroneously applied to the air conditioner 10 and the changeover switch 135 is turned on, the rectifying circuit and smoothing circuit of the DC power supply circuit 130 convert the AC 200 V into DC 280 V, and the voltage is doubled. The circuit doubles the 280V DC to 560V DC. When such an undesirably high voltage is applied to the indoor fan motor 120, which is a load, the rated voltage of each component in the indoor fan motor 120 may be exceeded, resulting in damage to the component.

On the other hand, when the switch 135 is off as shown in FIG. 3B, the voltage doubler circuit does not operate. In this case, even if a commercial power supply of 200 V AC is applied to the air conditioner 10 , the 200 V AC is merely converted to 280 V DC by the rectifying circuit and smoothing circuit of the DC power supply circuit 130 , and an undesirably high voltage is applied to the indoor fan motor 120 . never given. Also, when commercial power supply AC 100V is applied with change-over switch 135 turned off, AC 100V is converted to DC 140V by DC power supply circuit 130 and applied to indoor fan motor 120, but this does not cause component damage.

In the air conditioner 10 according to Embodiment 1, as shown in FIG. 2, when a commercial power supply of 200 V AC is erroneously applied, this can be detected by the applied voltage detection circuit 150 and the outdoor controller 160. . The applied voltage detection circuit 150 outputs to the outdoor controller 160 an applied voltage detection signal whose value changes depending on whether AC 100V is applied or AC 200V is erroneously applied. The outdoor controller 160 determines whether the applied voltage is AC100V or AC200V based on this applied voltage detection signal. Accordingly, the applied voltage detection circuit 150 and the outdoor control section 160 correspond to the first determination section described in the claims. Further, the outdoor controller 160 notifies the indoor controller 140 of the determination result of the applied voltage through serial communication.

FIG. 4 is a diagram showing a schematic configuration of the applied voltage detection circuit 150. As shown in FIG. In FIG. 4, the applied voltage detection circuit 150 is composed of resistors R1 to R4 and a comparator Cp1. Of the two power lines output from the rectifier circuit (that is, the rectifier bridge 131) of the DC power supply circuit 130, the potential of the high-level power line HDD is input to the comparator Cp1 via resistors R1 to R4. The comparator Cp1 compares the input potential of the high-level power supply line HDD with a reference potential (threshold), and outputs the comparison result to the outdoor controller 160 as an applied voltage detection signal. The output of the applied voltage detection signal is switched depending on which of the potential of the high-level power supply line HDD and the reference potential is larger.

For example, the value of the applied voltage detection signal is "0" if the potential of the high-level power supply line HDD is lower than the reference potential (set to a potential between 140V and 280V), and the potential of the high-level power supply line HDD is the reference potential. If it is greater than the potential, it is assumed to be "1". In this case, the outdoor controller 160 can determine that the applied voltage is 100 V AC if the value of the applied voltage detection signal is “0”, and that the applied voltage is 200 V AC if the value of the applied voltage detection signal is “1”. can be determined to be an erroneous application of

In the air conditioner 10 according to Embodiment 1, power is applied on the indoor unit 100 side, and the indoor unit 100 is also provided with an indoor fan motor 120 and a DC power supply circuit 130 . In such a case, if the erroneous application of power is detected on the side of the indoor unit 100, the applied voltage detection circuit may not operate properly, or an erroneous detection may occur due to a software bug. may not be reliably prevented.

In contrast, in the air conditioner 10 , the applied voltage detection circuit 150 is provided not in the indoor unit 100 but in the outdoor unit 110 . For this reason, the determination result of erroneous application by the applied voltage detection circuit 150 and the outdoor-side control unit 160 is notified to the indoor-side control unit 140 by serial communication, and the indoor-side control unit 140 operates the voltage doubler circuit based on the determination result. / Switches non-operation (on/off of the changeover switch 135).

As a result, in the air conditioner 10, even if the applied voltage detection circuit 150 does not operate properly or an erroneous detection occurs due to a software bug, the indoor control unit 140 side detects malfunction of the applied voltage detection circuit 150. can be recognized. Therefore, the indoor control unit 140 disables the voltage doubler circuit not only when the outdoor control unit 160 notifies of erroneous application of 200 V AC, but also when the applied voltage detection circuit 150 malfunctions. Therefore, it is possible to more reliably prevent the undesired operation of the voltage doubler circuit (the operation of the voltage doubler circuit when AC 200V is erroneously applied).

[Embodiment 2]
FIG. 5 is a configuration diagram showing a drive control system for indoor fan motor 120 in air conditioner 10 according to Embodiment 2. As shown in FIG. The air conditioner 10 shown in FIG. 5 includes not only the applied voltage detection circuit 150 on the outdoor unit 110 side but also the applied voltage detection circuit 151 on the indoor unit 100 side. As a result, both the outdoor unit 110 and the indoor unit 100 can detect erroneous application of power, thus providing a dual protection function against erroneous application of power.

The applied voltage detection circuit 151 provided in the indoor unit 100 can have the same configuration as the applied voltage detection circuit 150 provided in the outdoor unit 110, that is, the configuration shown in FIG. Also, the applied voltage detection signal output by the applied voltage detection circuit 151 is input to the indoor controller 140 . The indoor controller 140 determines whether the applied voltage is AC100V or AC200V based on this applied voltage detection signal. Accordingly, the applied voltage detection circuit 151 and the indoor-side control section 140 correspond to the second determination section described in the claims.

FIG. 6 is a flowchart showing a startup sequence of indoor fan motor 120 in air conditioner 10 according to the second embodiment. In the startup sequence shown in FIG. 6, when commercial power is applied to the air conditioner 10 (S1), applied voltage determination is performed in each of the indoor unit 100 and the outdoor unit 110 . At the start of this startup sequence, the changeover switch 135 of the DC power supply circuit 130 is off, and the voltage doubler circuit is in a non-operating state.

In the applied voltage determination (S2) on the indoor unit 100 side, based on the applied voltage detection signal output by the applied voltage detection circuit 151, the indoor controller 140 determines whether the applied voltage is AC 100V or AC 200V.

Further, in order to determine the applied voltage on the side of the outdoor unit 110, first, a main relay (not shown) between the indoor unit 100 and the outdoor unit 110 is turned on to energize the outdoor unit 110, and the indoor unit Serial communication between 100 and outdoor unit 110 is started (S3). Then, in the applied voltage determination (S4) on the outdoor unit 110 side, the outdoor controller 160 determines whether the applied voltage is AC 100 V or AC 200 V based on the applied voltage detection signal output by the applied voltage detection circuit 150. . The determination result by the outdoor controller 160 is transmitted to the indoor controller 140 by serial communication (S5).

If the applied voltage is 100 V AC in both the determination result of S2 determined by itself and the determination result of S5 transmitted from the outdoor control unit 160 (YES in S6), the indoor control unit 140 switches to the DC power supply circuit. The voltage doubler circuit 130 is operated to start the indoor fan motor 120 (S7). On the other hand, if the applied voltage is AC 200 V in either one of the determination result of S2 and the determination result of S5 transmitted from the outdoor control unit 160 (NO in S6), the indoor control unit 140 The voltage doubler circuit of the power supply circuit 130 is deactivated, and an erroneous application detection of AC 200V is detected in the indoor unit 100 (for example, a warning with a beep) is issued (S8).

[Embodiment 3]
In Embodiments 1 and 2 above, the case where the power supply (for example, commercial power supply AC 100 V) of the air conditioner 10 is applied from the indoor unit 100 side has been illustrated. However, the present invention is not limited to this, and the power of the air conditioner 10 may be applied from the outdoor unit 110 side.

Even in the air conditioner 10 in which power is applied from the outdoor unit 110 side in this way, the applied voltage detection circuit 150 and the outdoor control unit 160 on the outdoor unit 110 side perform determination of erroneous application detection, and the determination By notifying indoor-side control unit 140 of the result through serial communication, the same effect as that of air conditioner 10 of Embodiment 1 can be obtained.

In the air conditioner 10 described in Embodiments 1 to 3 above, when an erroneous application of 200 V AC is detected, the voltage doubler circuit of the DC power supply circuit 130 is deactivated, and a warning of erroneous application detection of 200 V AC is issued. exemplified. This configuration is based on the assumption that the air conditioner 10 is a 100V model in which a commercial power supply of AC 100V is applied. However, the present invention is not limited to this, and the air conditioner 10 can be a 100V/200V common model that can be used regardless of whether the commercial power source AC 100V or AC 200V is energized. That is, when the application of AC 100V is detected, the changeover switch 135 of the DC power supply circuit 130 is turned on to drive the indoor fan motor 120 in a state where the voltage doubler circuit is operated, and when the application of AC 200V is detected. Alternatively, it is possible to drive the indoor fan motor 120 in a state in which the selector switch 135 of the DC power supply circuit 130 is turned off and the voltage doubler circuit is inoperative. However, in this case, the drive control system other than the indoor fan motor 120 must also be configured to be compatible with the application of AC 200V.

Further, the timing for performing the erroneous application detection described in the first to third embodiments can be considered as follows.
- When the power of the air conditioner 10 is turned on (when the indoor fan motor 120 is started)
・When power is first turned on after plugging into the outlet of the air conditioner 10: In the air conditioner 10, since the power outlet is usually not frequently connected and disconnected, erroneous application only occurs when the power is turned on for the first time after plugging into the outlet. It may be one that performs detection.
• During operation of the air conditioner 10: The above-described erroneous application detection may be performed all the time while the air conditioner 10 is in operation. In this case, not only erroneous application of AC200V, but also abnormal high voltage application due to fluctuations in the power supply voltage can be detected. The protection of the harmony machine 10 can be aimed at.

In addition, when the refrigerating cycle is not operated in a normal air conditioner such as during air blowing operation, only the indoor unit is operated without energizing the outdoor unit. The harmony machine 10 energizes the outdoor unit 110 even during the air blowing operation when performing the erroneous application detection.

The embodiments disclosed this time are exemplifications in all respects and are not grounds for restrictive interpretation. Therefore, the technical scope of the present invention is not to be interpreted only by the above-described embodiments, but is defined based on the claims. In addition, all changes within the meaning and range of equivalence to the claims are included.

10 air conditioner 100 indoor unit 102 indoor fan 110 outdoor unit 120 indoor fan motor 130 DC power supply circuit 131 rectification bridge (rectification circuit)
132 capacitor (smoothing circuit)
133, 134 capacitor (voltage doubler circuit)
135 switch (switching means)
140 indoor control unit (control unit, second determination unit)
150 Applied voltage detection circuit (first determination unit)
151 Applied voltage detection circuit (second determination unit)
160 outdoor control unit (first determination unit)

Claims (4)

An air conditioner comprising an indoor unit and an outdoor unit,
an indoor fan motor which is a DC fan motor with a rated voltage of 280V;
When a commercial power supply of AC 100V is applied, the applied AC 100V is converted to DC 140V, the converted DC 140V is doubled to DC 280V by a voltage doubler circuit, and can be supplied to the indoor fan motor, and the voltage doubler circuit a DC power supply circuit comprising switching means capable of switching between operation and non-operation of
a first determination unit that determines whether the applied power is AC 100V or AC 200V;
Based on the determination result of the first determination unit, when the applied power is AC 100V, the switching means is controlled to operate the voltage doubler circuit, and when the applied power is AC 200V, the switching means is controlled. and a control unit that disables the voltage doubler circuit by
The control unit is provided in the indoor unit, the first determination unit is provided in the outdoor unit,
The air conditioner, wherein the first determination unit transmits the determination result to the control unit by serial communication. The air conditioner according to claim 1,
A second determination unit that is provided in the indoor unit and determines whether the applied power supply is AC 100 V or AC 200 V,
The control unit determines that AC 100 V is applied when both the determination results of the first determination unit and the second determination unit are AC 100 V, controls the switching means to operate the voltage doubler circuit, When at least one of the determination results of the first determination unit and the second determination unit is AC200V, it is determined that AC200V has been applied, and the switching means is controlled to disable the voltage doubler circuit. An air conditioner characterized by: The air conditioner according to claim 1 or 2,
The air conditioner according to claim 1, wherein when it is determined that AC200V is applied, the control unit determines that it is an erroneous application, and causes the indoor unit to issue an erroneous application detection warning. The air conditioner according to claim 1 or 2,
The DC power supply circuit supplies DC 280V doubled by the voltage doubler circuit to the indoor fan motor when it is determined that AC 100V is applied, and the applied AC 200V is supplied when AC 200V is determined to be applied. is converted to DC 280V and supplied to the indoor fan motor.

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