JP2003169481A - Power supply and air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a power circuit having the function of detecting an abnormality of power voltage and preventing the breakage of parts, the generation of abnormal noise and the like, and to provide an air conditioner with the power circuit. <P>SOLUTION: The power supply includes an input terminal connected with a power voltage, a drive power generating means for generating drive power for controlling an apparatus on the basis of the power voltage fed to the input terminal, a waveform-detecting means for detecting a feeding voltage waveform based on the power voltage fed to the input terminal, an abnormality- determining means for determining whether there is an abnormality on the basis of the feeding voltage waveform detected by the waveform detecting means, and an output control means for controlling the drive power generated from the drive power generating means when the abnormality of power supply is detected by the abnormality-determining means. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device having a function of protecting against an abnormal power supply voltage and an air conditioner equipped with such a power supply device.

[0002]

2. Description of the Related Art In order to control each part of a device at an arbitrary frequency, an inverter circuit is used which rectifies a commercial AC power source into a direct current and then converts it into an alternating current controlled to an arbitrary frequency. A device including frequency control by such an inverter circuit may be in a dangerous state due to an abnormal input voltage. For example, if an incorrect power supply voltage is applied due to incorrect wiring, there is a risk of destruction of parts.
Further, when an abnormality occurs in the input power supply voltage waveform such as a momentary voltage drop, a momentary power failure, or a power supply waveform distortion, there is a possibility that a noise such as abnormal noise may occur from the winding parts or the capacitor.

Originally, since the input power supply voltage itself cannot be changed, even if protection is applied on the device side, it is not a fundamental solution to the abnormal input voltage.
In many cases, the protection function against abnormal input voltage is not positively provided.

[0004]

However, when the input power supply voltage is abnormal, as described above,
Since there are problems such as damage to parts and abnormal noise, it is desirable to detect voltage abnormalities in some form and perform protective operations to avoid equipment failures. In particular, there is a tendency for parts to be destroyed or abnormal noise to occur frequently in places where the power supply voltage is unstable, such as in overseas countries, and it has been earnestly desired to provide a device having a protection function against abnormal input voltage.

An air conditioner can be considered as a device that employs an inverter circuit. A compressor that constitutes a refrigerant circuit is arranged in the outdoor unit of the air conditioner, and the frequency thereof is controlled according to operating conditions. The compressor power supply circuit for controlling the operation of such a compressor is
Some include an inverter circuit that outputs an output of a frequency based on an operating condition to a compressor drive motor, and an active filter circuit that outputs an output signal of a constant voltage to the inverter circuit.

The active filter circuit can improve the power factor when executing the motor control by the inverter circuit, and can realize high output and energy saving. In a device using such an active filter circuit, it is conceivable that elements constituting the circuit will be destroyed due to a sudden change in the power supply voltage. Therefore, it is desired to have a function of protecting the input power supply voltage from abnormality.

In the air conditioner, the indoor unit and the outdoor unit communicate with each other to transmit and receive various environmental information and operation command information, and control based on the information. In such communication between the indoor unit and the outdoor unit, when the communication means synchronized with the power supply cycle is used, the zero-cross timing of the power supply is often used, and when the power supply waveform has distortion. There is a risk that a communication error will occur and normal device control may not be possible.

According to the present invention, there is provided a power supply circuit having a protection function for detecting an abnormality in the power supply voltage to prevent destruction of parts and generation of abnormal noise, and an air conditioner equipped with such a power supply circuit. The purpose is to do.

[0009]

A power supply device according to claim 1 of the present invention outputs an input terminal to which a power supply voltage is connected, and drive power for device control based on the power supply voltage supplied to the input terminal. Drive power generation means, a waveform detection means for detecting a supply voltage waveform based on the power supply voltage supplied to the input terminal, and an abnormality determination for determining whether or not there is a power supply abnormality based on the supply voltage waveform detected by the waveform detection means. And an output control unit that controls the drive power output from the drive power generation unit when the power supply abnormality is detected by the abnormality determination unit.

In this case, the power supply abnormality is detected based on the power supply waveform, and the output from the drive power generation means is stopped by the output control means or an appropriate correction is performed to protect the circuit components. Therefore, it is possible to prevent the destruction of parts and the generation of abnormal noise. A power supply device according to claim 2 of the present invention is the power supply device according to claim 1, wherein the waveform detection means is configured to detect a voltage waveform immediately after the input terminal as a supply voltage waveform.

In this case, the power supply voltage waveform is directly detected,
Power supply abnormalities such as erroneous voltage application, momentary voltage drop, momentary power failure, waveform distortion, and voltage peak abnormality can be reliably detected. A power supply device according to claim 3 of the present invention is the power supply device according to claim 1, wherein a rectifier for rectifying a power supply voltage supplied to an input terminal and a voltage after passing through the rectifier are smoothed. The smoothing section is further provided, and the waveform detecting means is configured to detect a voltage waveform after passing through the rectifier and before passing through the smoothing section as a supply voltage waveform.

In this case, the power supply abnormality can be detected by the pulsating flow after the rectification by the rectifier and before the smoothing by the smoothing section. A power supply device according to claim 4 of the present invention is the power supply device according to claim 1, wherein the drive power generation means is an inverter circuit that generates drive power and an active circuit that supplies a constant voltage output to the inverter circuit. A filter circuit, and the waveform detection means is configured to detect a voltage waveform input to the active filter circuit as a supply voltage waveform.

In this case, the detection voltage used for control in the active filter circuit and the detection voltage for detecting the power supply abnormality can be used in common, and the circuit configuration can be simplified. A power supply device according to claim 5 of the present invention is claim 4
In the power supply device according to the item (4), the output control means is configured to stop the output from the drive power generation means by stopping the output of the inverter circuit and the active filter circuit.

In this case, when a power supply abnormality such as a momentary voltage drop or a momentary power failure is detected, the active filter circuit and the inverter circuit can be stopped to prevent the destruction of circuit components. The power supply device according to claim 6 of the present invention is the power supply device according to claim 5, further comprising a main relay provided between the input terminal and the drive power generation means, and the output control means turns off the main relay. By doing so, the output from the drive power generation means is stopped.

In this case, for example, when an erroneous voltage application or an abnormality in the voltage peak value is detected, the main relay is immediately turned off to prevent the destruction of circuit components. A power supply device according to claim 7 of the present invention is the power supply device according to any one of claims 4 to 6, wherein the abnormality determining means detects an erroneous voltage application by performing an effective value calculation of a supply voltage waveform. Is composed of.

In this case, when an erroneous voltage application is detected, the main relay is immediately disconnected to prevent the circuit components from being broken. A power supply device according to claim 8 of the present invention is the power supply device according to any one of claims 4 to 7, wherein the abnormality determining means detects an instantaneous voltage drop by performing an effective value calculation of the supply voltage waveform. Is configured as follows.

In this case, when an instantaneous voltage drop is detected,
By stopping the active filter circuit and the inverter circuit, destruction of circuit components can be prevented. The power supply device according to claim 9 of the present invention is the power supply device according to any one of claims 4 to 8, wherein the abnormality determining means calculates the effective value of the supply voltage waveform to thereby determine the input voltage to the inverter circuit. It is configured to predict and perform duty correction of the output from the drive power generation means by the output control means.

In this case, the drive power output from the inverter circuit can be corrected based on the voltage level of the power supply voltage, and the error in device control can be corrected. The power supply device according to claim 10 of the present invention is defined by claims 4 to 9.
In any one of the power supply devices described above, the abnormality determination means is configured to detect the peak value of the supply voltage waveform and compare the peak value with the element breakdown voltage of the drive power generation means.

In this case, when the peak value of the supply voltage waveform exceeds the withstand voltage of the component, it is possible to prevent the component from being broken by immediately disconnecting the main relay. A power supply device according to claim 11 of the present invention is the power supply device according to any one of claims 4 to 10, wherein the abnormality determining means detects a zero cross point of the supply voltage waveform, and the output control means corrects the zero cross point. Is configured to do.

By correcting the zero cross point when the zero cross point is deviated based on the waveform distortion of the power supply voltage, it is possible to prevent the communication abnormality even when the communication means synchronized with the power supply cycle is provided. A power supply device according to a twelfth aspect of the present invention is the power supply device according to any one of the fourth to eleventh aspects, wherein the abnormality determining means is configured to detect the instantaneous power failure based on the supply voltage waveform.

In this case, when a momentary power failure is detected, the main relay is turned off immediately to prevent damage to the parts. A power supply device according to claim 13 of the present invention is
It is a power supply device in any one of Claims 4-12, Comprising:
The abnormality determining means is configured to compare the supply voltage waveform with the reference sine wave and detect the presence or absence of power supply abnormality based on the deviation.

In this case, it becomes possible to detect the power supply abnormality based on the reference sine wave. An air conditioner according to claim 14 of the present invention is an air conditioner that performs an air conditioning operation based on drive power supplied from a power supply device, wherein the power supply device has an input terminal to which a power supply voltage is connected and an input. A drive power generation unit that outputs drive power for device control based on a power supply voltage supplied to a terminal, a waveform detection unit that detects a supply voltage waveform based on a power supply voltage supplied to an input terminal, and a waveform detection unit. Abnormality determining means for determining whether or not there is a power supply abnormality based on the detected supply voltage waveform; and output control means for controlling drive power output from the drive power generating means when the power supply abnormality is detected by the abnormality determining means. Is equipped with.

In this case, it is possible to prevent the parts from being broken or the abnormal noise from being generated when there is a power supply abnormality such as an erroneous voltage application, an instantaneous voltage drop, an instantaneous power failure, a waveform distortion, and a voltage peak abnormality. Noise can be suppressed.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION [External Configuration of Air Conditioner] An external configuration of an air conditioner to which an embodiment of the present invention is applied is shown in FIG.
Shown in. The air conditioner 1 includes an indoor unit 2 attached to a wall surface in the room and an outdoor unit 3 installed outdoors. The outdoor unit 3 includes an outdoor air conditioning unit 5 that houses an outdoor heat exchanger, an outdoor fan, and the like.

An indoor heat exchanger is housed in the indoor unit 2,
An outdoor heat exchanger is housed in the outdoor unit 3, and each heat exchanger is connected by a refrigerant pipe 6 to form a refrigerant circuit. [Schematic Configuration of Refrigerant Circuit] An example of a refrigerant circuit used in the air conditioner 1 is shown in FIG.

An indoor heat exchanger 11 is provided in the indoor unit 2. The indoor heat exchanger 11 is composed of a heat transfer tube that is folded back a plurality of times at both ends in the length direction, and a plurality of fins through which the heat transfer tube is inserted, and performs heat exchange with contacting air. In addition, a cross flow fan 12 is provided in the indoor unit 2 for sucking indoor air and exchanging heat with the indoor heat exchanger 11 into the room. The cross-flow fan 12 is formed in a cylindrical shape and has blades provided on the peripheral surface in the direction of the rotation axis, and generates an air flow in the direction intersecting with the rotation axis. The cross flow fan 12 is rotationally driven by a fan motor 13 provided inside the indoor unit 2.

The outdoor air conditioning unit 5 includes a compressor 21 and
A four-way switching valve 22 connected to the discharge side of the compressor 21, an accumulator 23 connected to the suction side of the compressor 21,
An outdoor heat exchanger 24 connected to the four-way switching valve 22 and a pressure reducer 25 including an electric expansion valve connected to the outdoor heat exchanger 24.
And are provided. The decompressor 25 is connected to a field pipe 31 via a filter 26 and a liquid shutoff valve 27, and is connected to one end of the indoor heat exchanger 11 via the field pipe 31. Further, the four-way switching valve 22 is the gas closing valve 2
8 is connected to the on-site pipe 32 via 8 and is connected to the other end of the indoor heat exchanger 11 via this on-site pipe 32. The field pipes 31 and 32 correspond to the refrigerant pipe 6 in FIG.

In the outdoor air conditioning unit 5, a propeller fan 29 for discharging the air after heat exchange in the outdoor heat exchanger 24 to the outside is provided. This propeller fan 2
9 is rotationally driven by the fan motor 30. [Control Block Diagram] FIG. 3 shows a control block diagram of the outdoor air conditioning unit 5 and the indoor unit 2.

The outdoor air conditioning unit 5 includes an outdoor unit controller 501 including a microprocessor, ROM, RAM, various interfaces and the like. The outdoor unit control unit 501 is connected to various sensors such as a discharge side pressure protection switch 502, a discharge pipe thermistor 503, a suction side pressure sensor 504, an outside air thermistor 505, and an outdoor heat exchange thermistor 506. Is entered.

The outdoor unit controller 501 drives the compressor driver 507 for driving the compressor 21, the four-way switching valve driver 508 for driving the four-way switching valve 22, and the motor-operated valve 25. It is connected to the electric valve drive unit 509, the outdoor fan motor drive unit 510 that drives the outdoor fan motor 30, and the like, and generates a control signal for controlling each unit.

The indoor unit 2 is a microprocessor, RO
An indoor unit controller 201 including M, RAM, various interfaces, etc. is provided. Indoor unit controller 2
01 is a liquid pipe thermistor 202 and a gas pipe thermistor 20.
3, various sensors such as the indoor heat exchange thermistor 204, the room temperature sensor 205, and the humidity sensor 208 are connected, and the detection signal of each sensor is input.

The indoor unit control section 201 also includes an indoor fan motor drive section 2 for driving the indoor fan motor 13.
10, a horizontal blade operating motor drive unit 211 for driving a horizontal blade operating motor (not shown), a vertical blade operating motor drive unit 212 for driving a vertical blade operating motor (not shown), a display unit 206, It is connected to the infrared transmitting / receiving unit 207 and the like, and is configured to control each unit during operation by supplying a control signal to each unit.

[Power Supply Device] (A) Of the power supply device for supplying the power supply voltage to each part, the part that performs frequency control via the inverter circuit (for example, the compressor drive part 50 for driving the compressor 21).
FIG. 4 shows an example of a circuit configuration including 7). Power supply 10
0 is, for example, a motor 402 provided in the compressor 21.
Is driven by using the power supply voltage supplied from the commercial power supply 401, and the terminal unit 1 connected to the commercial power supply 401
It is equipped with 01.

Further, the power supply device 100 includes the terminal portion 10
Rectifier 10 for rectifying the power supply voltage supplied from
3. Smoothing unit 10 for smoothing the output of the rectifier 103
4. An inverter circuit 105 that outputs drive power whose frequency is controlled based on the output of the smoothing unit 104 is provided.
In this power supply device 100, a commercial power supply voltage supplied via a terminal unit 101 is rectified by a rectifier 103, converted into a direct current by a smoothing unit 104, and then an inverter circuit 105 is provided.
At, the drive power of the motor 401 is output based on the frequency command information. A main relay 102 for stopping power supply is provided between the terminal portion 101 and the rectifier 103.

In the present invention, in such a power supply device 100, the voltage waveform at the terminal section 101 (detection section A) or the output waveform of the rectifier 103 (detection section B) is detected as a supply voltage waveform, and this supply voltage waveform is detected. When there is an abnormality, the main relay 102 is turned off and control is performed so that the output waveform from the inverter circuit 105 becomes appropriate. (B) An example of a power supply device including an active filter circuit for supplying a constant voltage to the inverter circuit 105 is shown in FIG.

The power supply device 120 is the above-described power supply device 100.
Similarly, the motor 402 provided in the compressor 21 is driven by using the power supply voltage supplied from the commercial power supply 401, and the terminal unit 101 connected to the commercial power supply 401 is provided. In addition, the power supply device 100 includes the terminal portion 10
Rectifier 10 for rectifying the power supply voltage supplied from
3. Smoothing unit 10 for smoothing the output of the rectifier 103
4. An inverter circuit 105 that outputs drive power whose frequency is controlled based on the output of the smoothing unit 104 is provided.
The rectifier 103 can be configured by a diode bridge or the like, and the smoothing unit 104 can be configured by a smoothing capacitor. Between the terminal unit 101 and the rectifier 103, a main relay 102 for stopping the power supply.
Is provided. The power supply device 120 is the inverter circuit 1
The active filter circuit 150 is provided for keeping the voltage supplied to 05 constant.

The active filter circuit 150 includes a switching element 151 and an active filter drive circuit 152 that controls switching of the switching element 151.
And an input resistor 153 for detecting the primary side current. Further, the active filter circuit 150
Is a first voltage sensor 15 for detecting the primary side voltage.
4. Second voltage sensor 155 for detecting secondary side voltage
Is equipped with.

The active filter drive circuit 152 receives the input voltage command signal and the detection value of the second voltage sensor 155, and outputs the voltage feedback amplifier 162 and the voltage feedback amplifier 162 based on the difference between them. The detection value of the first voltage sensor 154 is input, and the multiplier 163 that outputs according to the ratio, the output of the multiplier 163, and the input current detected by the input resistor 153 are input, and output based on this. The current feedback amplifier 164 for performing the above operation, the oscillator 165 for generating the carrier signal of the switching control signal for the switching element 151, and the carrier signal from the oscillator 165 are compared with the output of the current feedback amplifier 164 to output the duty-controlled pulse signal. Comparator 16
6 and.

The active filter drive circuit 152 controls the switching of the switching element 151 so that the secondary voltage detected by the second voltage sensor 155 matches the input voltage command. In such a power supply device 120, the detection value (detection unit C) of the first voltage sensor 154 is detected as a supply voltage waveform, and when the supply voltage waveform is abnormal, the reference signal supplied to the comparator 166 is detected. By setting it to a low level, the boosting operation is stopped to prevent the abnormal power supply to the inverter circuit 105, and the main relay 102 is turned off to protect the circuit.

[Circuit Protection Function] A circuit protection function for preventing circuit damage or abnormal noise due to power supply abnormality when the above power supply device is used will be described with reference to the flowchart of FIG. . In step S11, the supply voltage waveform is detected. In the case of the power supply device 100, the voltage waveform at the terminal unit 101 (detection unit A) or the output waveform of the rectifier 103 (detection unit B) is detected as the supply voltage waveform. Further, in the case of the power supply device 120, it is possible to detect the detection value (detection unit C) of the first voltage sensor 154 as the supply voltage waveform, and it is also possible to detect the voltage waveform at the terminal unit 101. It is possible.

In step S12, the supply voltage waveform is compared with the reference sine wave. In step S13, it is determined whether or not there is an instantaneous power failure. For example, as shown in FIG.
If there is a portion where the voltage waveform is interrupted between times t1 and t2 in the supply voltage waveform, it is determined that there is an instantaneous power failure in this section, and the process proceeds to step S14. In step S14, it is determined whether or not the momentary power failure time is equal to or shorter than a predetermined value. It is determined whether or not the time Δt in the section of the instantaneous power failure shown in FIG. 7 is within a preset allowable range. If it exceeds the allowable range, it is determined that the power source is abnormal, and step S15 is performed.
Move to.

In step S15, stop processing based on the power supply abnormality is executed. For example, in the case of power supply 120,
By setting the reference voltage of the comparator 166 of the active filter drive circuit 152 to the minimum, the switching element 151 is stopped and the boosting operation of the active filter is stopped. At the same time, the inverter circuit 105 is stopped to prevent damage to the inverter element and the motor.
After that, the apparatus can be configured to be completely stopped by turning off the main relay 102. In the case of the power supply device 100, the main relay 1
By setting 02 to be in the cutoff state, it is possible to execute the stop processing based on the power supply abnormality.

In step S16, it is determined whether or not the voltage peak of the supply voltage waveform exceeds the specified value. For example, when the supply voltage waveform Es has a distortion with respect to the reference sine wave Er as shown in FIG. 8, the voltage peak value Vmax may be high. When it is determined that the voltage peak value Vmax of the supply voltage waveform Es exceeds the preset reference value, the process proceeds to step S17.

In step S17, stop processing based on power supply abnormality is executed. Also in this case, the comparator 1 of the active filter drive circuit 152 is processed in the same manner as in step S15.
By setting the reference voltage of 66 to the minimum, the switching element 151 is stopped and the boosting operation of the active filter is stopped, or the main relay 102 is cut off to execute the stop processing based on the power supply abnormality. be able to.

In step S18, it is determined whether the waveform distortion of the supply voltage waveform exceeds the specified value. For example, as shown in FIG. 9, when the supply voltage waveform Es is distorted with respect to the reference sine wave Er, the deviation of the supply voltage waveform Es from the reference sine wave Er is calculated, and this deviation is preset. If it is determined that the specified value is exceeded, the process proceeds to step S19.

In step S19, an error signal is output. Here, a warning signal indicating that the distortion of the supply voltage waveform Es exceeds the specified value is output, and the display unit 206 of the indoor unit 2 is output.
To warn the user by displaying it on. In step S20, the zero cross point of the supply voltage waveform is corrected by the reference sine wave. Since the supply voltage waveform Es has a waveform distortion as shown in FIG. 10, the reference sine wave Er
If there is a deviation between the zero cross point Zr of the reference voltage waveform Es and the zero cross point Zs of the supply voltage waveform Es, the zero cross point correction is performed by the zero cross point Zr of the reference sine wave Er. This zero cross point correction can be configured to be performed when a predetermined number of zero cross points Zs of the supply voltage waveform Es are counted.

In step S21, the effective value of the supply voltage waveform is calculated. The effective value of the supply voltage waveform can be calculated by using a predetermined effective value calculation circuit or the like, and for example, the supply voltage waveform in a predetermined period can be sampled to calculate the voltage effective value in this period. . In step S22, it is determined whether the effective value of the supply voltage waveform is within the device rated range. For example, upper and lower limit values with respect to the effective value of the reference sine wave are set as the device rating range, and if the values do not fall within this range, it is determined that the device is out of the device rating range, and the process proceeds to step S23.

In step S23, it is determined whether or not the effective value of the supply voltage waveform converges within the rated range of the equipment within the specified time. For example, when the instantaneous stop state is intermittent and continues for a predetermined time or longer, the effective value of the supply voltage waveform may continue for a predetermined time or longer. In such a case, it is determined that the voltage is abnormal, and the process proceeds to step S24.

In step S24, stop processing based on the power supply abnormality is executed. In this case as well, similar to steps S15 and S17, the reference voltage of the comparator 166 of the active filter drive circuit 152 is set to the minimum, thereby stopping the switching element 151 and stopping the boosting operation of the active filter. Alternatively, by stopping the main relay 102, the stop process based on the power supply abnormality can be executed.

In step S25, the duty of the inverter output is corrected. Here, the inverter circuit 10 is based on the deviation between the effective values of the supply voltage waveform and the reference voltage waveform.
The duty of the output of No. 5 is corrected. In the configuration as described above, the output duty of the inverter circuit 105 is adjusted according to the difference in the supply voltage to the inverter circuit 105, and the device operation by the drive power from the inverter circuit 105 can be stabilized, resulting in high efficiency. Can be controlled.

In addition, the inverter circuit 105 and the smoothing unit 10 due to a momentary power supply abnormality such as momentary voltage drop or momentary power failure.
4 (converter part) can be prevented from being damaged. Further, even if the zero cross point is deviated due to the waveform distortion of the supply voltage waveform, the zero cross point is appropriately compared with the reference sine wave for correction, and communication is performed in synchronization with the zero cross point of the supply voltage waveform. Even in such a case, it is possible to maintain a steady operation without causing communication abnormality.

When the active filter circuit 150 is used, the power supply abnormality can be detected by using the detection voltage on the primary side used for controlling the active filter drive circuit 152, and the present invention can be realized without increasing the cost. It is possible to realize the configuration of. Furthermore, because the distortion of the power supply voltage is detected, it is possible to determine whether the power supply is abnormal or due to other factors when abnormal noise occurs or when a component fails, making it easy to handle. Become.

[Other Embodiments] When the outdoor fan motor 30 provided in the outdoor air conditioning unit 5 is inverter-controlled, a similar configuration can be applied to the outdoor fan motor controller 510. Further, the configuration of the present invention can be applied to other devices controlled by inverters.

[0054]

In the power supply device according to claim 1 of the present invention,
It becomes possible to protect circuit components by detecting a power supply abnormality based on the power supply waveform and stopping the output from the drive power generation means by the output control means or by making an appropriate correction. It is possible to prevent the destruction of the vehicle and the generation of abnormal noise.

In the power supply device according to the second aspect of the present invention, the power supply voltage waveform is directly detected to reliably detect power supply abnormalities such as erroneous voltage application, momentary voltage drop, momentary power failure, waveform distortion, and voltage peak abnormality. be able to. In the power supply device according to the third aspect of the present invention, the power supply abnormality can be detected by the pulsating current after rectification by the rectifier and before smoothing by the smoothing unit.

In the power supply device according to the fourth aspect of the present invention, the detection voltage used for control by the active filter circuit and the detection voltage for detecting the power supply abnormality can be shared, and the circuit configuration can be simplified. You can In the power supply device according to the fifth aspect of the present invention, when a power supply abnormality such as a momentary voltage drop or a momentary power failure is detected, the active filter circuit and the inverter circuit can be stopped to prevent destruction of circuit components. .

In the power supply device according to the sixth aspect of the present invention, when the erroneous voltage application or the abnormal voltage peak value is detected, for example, the main relay is immediately turned off to prevent the destruction of the circuit components. In the power supply device according to the seventh aspect of the present invention, when the erroneous voltage application is detected, the main relay is immediately cut off to prevent the destruction of the circuit components.

In the power supply device according to the eighth aspect of the present invention, when the instantaneous voltage drop is detected, the active filter circuit and the inverter circuit are stopped to prevent the destruction of the circuit components. In the power supply device according to the ninth aspect of the present invention, the drive power output from the inverter circuit can be corrected based on the waveform distortion of the power supply voltage, and the error in device control can be corrected.

In the power supply device according to claim 10 of the present invention,
When the peak value of the supply voltage waveform exceeds the element breakdown voltage of the component, the main relay is turned off immediately to prevent damage to the component. According to the eleventh aspect of the present invention, by correcting the zero cross point when the zero cross point is deviated based on the waveform distortion of the power supply voltage,
Even if the communication means synchronized with the power cycle is provided,
Communication abnormalities can be prevented.

In the power supply device according to claim 12 of the present invention,
When an instantaneous power failure is detected, the main relay is turned off immediately to prevent damage to parts. In the power supply device according to the thirteenth aspect of the present invention, it becomes possible to detect the power supply abnormality based on the reference sine wave. With the air conditioner according to claim 14 of the present invention, it is possible to prevent the destruction of parts and the occurrence of abnormal noise when there is a power supply abnormality such as erroneous voltage application, momentary voltage drop, momentary power failure, waveform distortion, and voltage peak abnormality. ,
It is possible to suppress the failure and noise of the air conditioner.

[Brief description of drawings]

FIG. 1 is a perspective view showing an external configuration of an air conditioner.

FIG. 2 is an explanatory diagram of a refrigerant circuit.

FIG. 3 is a control block diagram thereof.

FIG. 4 is a circuit diagram of a power supply device.

FIG. 5 is a circuit diagram of another example of the power supply device.

FIG. 6 is a control flowchart.

FIG. 7 is an explanatory diagram of a voltage waveform at the moment of a power failure.

FIG. 8 is an explanatory diagram of a voltage waveform including waveform distortion.

FIG. 9 is an explanatory diagram of a voltage waveform including waveform distortion.

FIG. 10 is an explanatory diagram of a voltage waveform including waveform distortion.

[Explanation of symbols]

105 Inverter circuit 150 Active filter circuit

Claims (14)

[Claims] 1. An input terminal to which a power supply voltage is connected, drive power generation means for outputting drive power for device control based on the power supply voltage supplied to the input terminal, and power supply supplied to the input terminal. A waveform detecting means for detecting a supply voltage waveform based on the voltage, an abnormality determining means for determining whether or not there is a power supply abnormality based on the supply voltage waveform detected by the waveform detecting means, and a power supply abnormality is detected by the abnormality determining means. And a power control device that controls the drive power output from the drive power generation device. 2. The power supply device according to claim 1, wherein the waveform detecting means detects a voltage waveform immediately after the input terminal as a supply voltage waveform. 3. A rectifier for rectifying a power supply voltage supplied to the input terminal, and a smoothing unit for smoothing the voltage after passing through the rectifier, wherein the waveform detecting means passes through the rectifier. The power supply device according to claim 1, wherein a voltage waveform after that and before passing through the smoothing unit is detected as a supply voltage waveform. 4. The drive power generation means includes an inverter circuit that generates drive power, and an active filter circuit that supplies a constant voltage output to the inverter circuit.
The power supply device according to claim 1, wherein the waveform detection unit detects a voltage waveform input to the active filter circuit as a supply voltage waveform. 5. The power supply device according to claim 4, wherein the output control means stops the output from the drive power generation means by stopping the output of the inverter circuit and the active filter circuit. 6. A main relay provided between the input terminal and the driving power generation means is further provided, and the output control means stops the output from the driving power generation means by turning off the main relay. The power supply device according to claim 5. 7. The power supply device according to claim 4, wherein the abnormality determining means detects an erroneous voltage application by calculating an effective value of a supply voltage waveform. 8. The power supply device according to claim 4, wherein the abnormality determining means detects an instantaneous voltage drop by performing an effective value calculation of a supply voltage waveform. 9. The abnormality determining means predicts an input voltage to the inverter circuit by calculating an effective value of a supply voltage waveform, and the output control means corrects a duty of an output from the drive power generating means. , Claims 4 to 8
The power supply device according to any one of 1. 10. The power supply device according to claim 4, wherein the abnormality determining means detects a peak value of a supply voltage waveform and compares the peak value with a device breakdown voltage of the drive power generating means. 11. The power supply device according to claim 4, wherein the abnormality determining means detects a zero cross point of the supply voltage waveform, and the output control means corrects the zero cross point. 12. The power supply device according to claim 4, wherein the abnormality determining means detects an instantaneous power failure based on a supply voltage waveform. 13. The power supply device according to claim 4, wherein the abnormality determining means compares the supply voltage waveform with a reference sine wave and detects the presence or absence of power supply abnormality based on the deviation. 14. An air conditioner that performs air conditioning operation based on drive power supplied from a power supply device, wherein the power supply device has an input terminal to which a power supply voltage is connected, and a power supply supplied to the input terminal. Drive power generation means for outputting drive power for device control based on voltage, waveform detection means for detecting a supply voltage waveform based on the power supply voltage supplied to the input terminal, and supply detected by the waveform detection means An abnormality determination unit that determines whether or not there is a power supply abnormality based on the voltage waveform, and an output control unit that controls the drive power output from the drive power generation unit when the power supply abnormality is detected by the abnormality determination unit. , Air conditioner.