JP2020145896A - Anomaly detection system and anomaly detection method thereof, and air conditioner - Google Patents

Abstract

To provide an anomaly detection system capable of accurately detecting anomaly of a target device and anomaly of a power supply, and an anomaly detection method thereof, and an air conditioner.SOLUTION: The anomaly detection system includes: a determination signal generation circuit 2 that has a circuit breaker 11 that opens when an anomaly occurs in a target device and is configured so as to, when the circuit breaker 11 is closed, conduct an AC voltage supplied from a power supply E to generate a determination signal based on the AC voltage; a power signal generation circuit 3 that generates a power supply signal based on the AC voltage; and a processing unit 4 that is supplied with the electric power from the power supply E and determines the existence of an anomaly in the object equipment and the power supply E based on the determination signal and the power supply signal.SELECTED DRAWING: Figure 2

Description

The present invention relates to an abnormality detection system, an abnormality detection method thereof, and an air conditioner.

In equipment such as an air conditioner, an abnormality detection process for determining the presence or absence of an equipment abnormality is performed. In the abnormality detection process, for example, the state of the target device is detected by a sensor, and the abnormality of the target device is detected based on the detected state.

Power is supplied from the power supply to the device that performs the abnormality detection process, but if there is a capacitance component on the output side of the power supply, it may take time to discharge due to the capacitance component even if an abnormality occurs in the power supply. There is.

Patent Document 1 discloses that a capacitor and a rectifier circuit are provided on the output side of an AC power supply to switch between a discharge path having a long discharge time and a discharge path having a short discharge time.

Japanese Unexamined Patent Publication No. 2017-55630

If there is a capacitance component on the output side of the power supply and it takes time to discharge due to the capacitance component, the power supply to the device that performs the abnormality detection process is stopped after the occurrence of the abnormality in the power supply. Therefore, there is a possibility that the device operates even after the abnormality of the power supply occurs, and the abnormality of the target device is erroneously determined even though the abnormality has occurred in the power supply.

Even if the discharge path with a long discharge time and the discharge path with a short discharge time are switched as in Patent Document 1, if the abnormality detector operates for the time required for discharge due to the capacitance component, the target device There is a possibility that an abnormality will be misjudged.

The present invention has been made in view of such circumstances, and provides an abnormality detection system capable of accurately detecting an abnormality of a target device and an abnormality of a power supply, an abnormality detection method thereof, and an air conditioner. With the goal.

The first aspect of the present invention has a switch that opens when an abnormality occurs in the target device, and conducts an AC voltage supplied from a power source when the switch is in the closed state to conduct the AC. A judgment signal generation circuit that generates a judgment signal based on a voltage, a power supply signal generation circuit that generates a power supply signal based on the AC voltage, and power is supplied from the power supply, and based on the judgment signal and the power supply signal. An abnormality detection system including a determination unit for determining the presence or absence of an abnormality in the target device and the power supply.

According to the above configuration, it is based on the judgment signal generated in the judgment signal generation circuit having a switch that opens when an abnormality occurs in the target device and the power supply signal generated in the power supply signal generation circuit. Therefore, it is possible to improve the detection accuracy of the abnormality of the target device and the abnormality of the power supply. For example, when an abnormality occurs in the power supply, the judgment signal is not generated by the judgment signal generation circuit because the AC voltage does not conduct, and the power is supplied to the judgment unit due to the influence of the capacitance component (capacitor, parasitic capacitance, etc.). May not be stopped immediately. In such a case, if the determination unit makes an abnormality determination using only the determination signal, it may be erroneously determined that an abnormality has occurred in the target device. However, based on the determination signal and the power supply signal based on the AC voltage, the determination unit can grasp the abnormality of the power supply, so that the abnormality of the target device and the abnormality of the power supply can be determined more accurately. Become.

In the abnormality detection system, the determination unit determines the presence or absence of an abnormality in the power supply based on the power supply signal, and when the abnormality is not determined in the power supply, the abnormality in the target device is based on the determination signal. It may be determined whether or not there is.

According to the above configuration, since the determination unit can determine the abnormality of the power supply from the power supply signal, it is possible to more accurately determine the abnormality of the target device by using the determination signal generated by the determination signal generation circuit. It will be possible.

In the abnormality detection system, the power supply signal may be a pulse signal whose value changes when the AC voltage changes beyond a predetermined threshold voltage.

According to the above configuration, since the power supply signal is a pulse signal whose value changes when the AC voltage changes beyond a predetermined threshold voltage, the periodic change of the AC voltage is reflected in the power supply signal. Is possible. That is, it is possible to reflect in the power supply signal whether or not an abnormality has occurred in the power supply, and it is possible to easily determine the abnormality in the power supply from the power supply signal. The threshold voltage is, for example, an arbitrarily set threshold value, and when the AC voltage changes beyond the threshold voltage, the High and Low of the pulse signal are inverted and changed.

In the abnormality detection system, the determination unit starts measuring the elapsed time when the value of the power supply signal changes, and determines that the power supply has an abnormality when the elapsed time reaches a predetermined value. It may be that.

According to the above configuration, by starting the measurement of the elapsed time when the value of the power supply signal changes, it is determined whether or not the AC voltage changes periodically depending on the length of the elapsed time. Can be done. That is, when the elapsed time reaches a predetermined value, it can be determined that the AC voltage does not change periodically (abnormality of the power supply).

In the abnormality detection system, the determination unit may start measuring the elapsed time when the power supply signal changes in response to the change of the AC voltage to the threshold voltage or higher.

When an abnormality occurs in the power supply, it is preferable that the value of the power supply signal is fixed immediately. However, the power supply to the power supply signal generation circuit may not be stopped immediately due to the influence of the capacitance component (capacitor, parasitic capacitance, etc.). In such a case, the power supply may be stopped with a delay after the occurrence of the power supply abnormality, and the value of the power supply signal may change (for example, the change in High and Low in the pulse signal), and the elapsed time may occur. There is a risk that the start of measurement will be delayed and the power supply abnormality judgment will be delayed. Therefore, when the power supply signal changes in response to a change in the AC voltage above the threshold voltage (that is, rising), the effect of the power supply stop delay due to the capacitance component is suppressed by starting the measurement of the elapsed time. It becomes possible to measure the elapsed time. Therefore, it is possible to more accurately determine the power supply abnormality.

In the abnormality detection system, the predetermined value may be set to a value less than the time required for determining the presence or absence of an abnormality in the target device.

According to the above configuration, a predetermined value is set as a value less than the time required to determine the presence or absence of an abnormality in the target device, so that the abnormality of the power supply is determined before the presence or absence of the abnormality in the target device is determined. can do. That is, it is possible to more accurately determine the abnormality of the target device and the abnormality of the power supply.

In the abnormality detection system, the value of the power supply signal is detected at a predetermined cycle, and when the power supply signal has the same state value a plurality of times in succession, a correction pulse signal having a value equal to the state value is generated. An update unit that updates the power supply signal as the correction pulse signal may be provided.

According to the above configuration, when the power supply signal becomes the same state value a plurality of times in succession, a correction pulse signal having the same value as the state value is generated, and the power supply signal is updated as the correction pulse signal. Therefore, noise processing can be performed on the power supply signal. For example, if the AC voltage contains noise, the noise may be reflected in the power supply signal. If noise is reflected in the power signal, the state value may take an abnormal value sporadically. Therefore, it is possible to suppress the influence of an abnormal state value and update the power supply signal by updating the power supply signal so that the value becomes equal to the state value when the state value becomes equal a plurality of times in succession. it can.

A second aspect of the present invention is an air conditioner including a compressor, a condenser, an evaporator, and the above-mentioned abnormality detection system.

In the third aspect of the present invention, the AC voltage supplied from the power source is conducted to conduct the AC when the switch is in the closed state by using the switch which is opened when an abnormality occurs in the target device. A judgment signal generation step of generating a judgment signal based on a voltage, a power supply signal generation step of generating a power supply signal based on the AC voltage, and power being supplied from the power supply, based on the judgment signal and the power supply signal. , A determination step for determining the presence or absence of an abnormality in the target device and the power supply, and an abnormality detection method.

According to the present invention, there is an effect that an abnormality of the target device and an abnormality of the power supply can be detected with high accuracy.

It is a figure which shows the schematic structure of the air conditioner which concerns on one Embodiment of this invention. It is a figure which shows the schematic structure of the abnormality detection system which concerns on one Embodiment of this invention. It is a figure which illustrated the power supply state of the processing apparatus which concerns on one Embodiment of this invention. It is a functional block diagram which showed the function which the processing apparatus has in the processing apparatus which concerns on one Embodiment of this invention. It is a figure which showed the abnormality determination process which concerns on one Embodiment of this invention. It is a figure which showed the abnormality determination process which concerns on one Embodiment of this invention. It is a figure which showed the noise processing which concerns on one Embodiment of this invention. It is a figure which showed the flowchart of the abnormality determination processing which concerns on one Embodiment of this invention.

Hereinafter, an abnormality detection system according to the present invention, an abnormality detection method thereof, and an embodiment of an air conditioner will be described with reference to the drawings.
FIG. 1 is a diagram showing a schematic configuration of an air conditioner 21 to which an abnormality detection system according to an embodiment of the present invention is applied. In the present embodiment, an air conditioner is described as an example of the target device of the abnormality detection system, but the abnormality detection system is not limited to the air conditioner and can be applied as the target device.

As shown in FIG. 1, the air conditioner 21 according to the present embodiment includes a compressor 22, a condenser 23, an expansion valve 24, and an evaporator 25 as main configurations. A compressor 22, a condenser 23, an expansion valve 24, and an evaporator 25 are connected to form a refrigeration cycle.

The refrigeration cycle is filled with a refrigerant, and it is possible to transfer thermal energy by controlling the compression and expansion of the refrigerant. Specifically, the refrigerant is compressed by the compressor 22 to be in a high temperature and high pressure state, and is supplied to the condenser 23. Then, in the condenser 23, the refrigerant is condensed by the transfer of heat from the refrigerant to the outside air. Then, the condensed refrigerant is expanded by the expansion valve 24 and supplied to the evaporator 25. Then, in the evaporator 25, the refrigerant evaporates as heat is transferred from the outside air to the refrigerant. Then, the evaporated refrigerant is supplied to the compressor 22, and the above cycle is repeated. That is, in the refrigeration cycle, the heat energy of the outside air on the evaporator 25 side is transferred to the outside air on the condenser 23 side. For example, the air conditioner 21 is composed of an indoor unit and an outdoor unit, the indoor unit includes an evaporator 25, and the outdoor unit includes a compressor 22, an expansion valve 24, and a condenser 23. That is, in the air conditioner 21, the indoor unit provided indoors transfers the thermal energy of the indoor air to the refrigerant flowing through the refrigeration cycle, and the outdoor unit provided outdoors transfers the thermal energy from the refrigerant to the outside air. I'm letting you. Therefore, the air in the room can be cooled (cooling operation). It should be noted that the heating operation using the refrigeration cycle can be performed in the same manner. That is, the heating operation can be performed by transferring the thermal energy of the outdoor air to the refrigerant flowing through the refrigeration cycle and transferring the thermal energy from the refrigerant to the inside air by the indoor unit provided in the room.

On the discharge side of the compressor 22 of the air conditioner 21, a sensor for measuring the pressure of the refrigerant discharged from the compressor 22 is provided. Then, when the refrigerant becomes abnormal at high pressure, the switch 11 of the determination signal generation circuit 2 described later is opened. For example, when the refrigerant pressure detected by the sensor becomes equal to or higher than a preset threshold value, the switch 11 is automatically opened. When the switch 11 is opened, an abnormality (high pressure abnormality) of the air conditioner 21 is detected in the abnormality detection system described later.

The abnormality detection system detects an abnormality in the air conditioner 21 which is a target device and an abnormality in the power supply E. FIG. 2 is a diagram showing a configuration example of an abnormality detection system. As shown in FIG. 2, the abnormality detection system includes a determination signal generation circuit 2, a power supply signal generation circuit 3, and a processing device 4. In the present embodiment, the power source E supplies electric power to the input unit 12, the input unit 15, and the processing device 4, which will be described later.

The determination signal generation circuit 2 has a switch 11 that is opened when an abnormality occurs in the air conditioner 21, and conducts an AC voltage supplied from the power source E when the switch 11 is in the closed state. Generates a judgment signal based on the AC voltage. Specifically, in the determination signal generation circuit 2, the input terminals of the switch 11 and the photocoupler 13 are connected in series with the input unit 12 (having the S phase and the R phase) to which the AC voltage is input from the power supply E. Connected to form a closed circuit. In the example shown in FIG. 2, the input unit 12 has an S phase and an R phase, but the input unit 12 has various methods such as a three-phase three-wire system and a three-phase four-wire system. Can be made to correspond to.

The switch 11 is in the closed state when the air conditioner 21 is operating normally, and is in the open state when an abnormality occurs in the air conditioner 21. When the sensor detects that the refrigerant pressure on the discharge side of the compressor 22 is abnormally high, the compressor 22 is opened. The switch 11 is configured by using, for example, a relay.

An AC voltage is input to the photocoupler 13 when the switch 11 is in the closed state. Then, when the voltage value of the AC voltage is a positive value, a forward voltage is applied to the input side of the photocoupler 13, and the light emitting element emits light. When the light emitting element emits light, the light receiving element provided inside the photocoupler 13 facing the light emitting element becomes conductive. One end of the output side of the photocoupler 13 is connected to a processing device 4 and a DC voltage power supply (for example, 5V) 14 described later, and the other end is grounded. That is, when the light receiving element is not conducting, the determination signal generation circuit 2 outputs the voltage value (for example, 5V) of the DC voltage power supply 14, and when the light receiving element is conducting, the judgment signal generation circuit 2 is 0V. (Ground voltage) is output. In other words, the determination signal generation circuit 2 outputs the voltage value (for example, 5V) of the DC voltage power supply 14 when the AC voltage is a negative value, and 0V (grounded) when the AC voltage is a positive value. Voltage) is output.

As described above, when the AC voltage is normally input and the switch 11 is closed (when no abnormality has occurred in the air conditioner 21), the determination signal generation circuit 2 uses the AC voltage as the determination signal. Outputs a pulse signal synchronized with.

On the other hand, the determination signal generation circuit 2 continuously outputs the voltage value of the DC voltage power supply 14 as the determination signal when the switch 11 is in the open state (when an abnormality has occurred in the air conditioner 21). The determination signal generation circuit 2 continuously outputs the voltage value of the DC voltage power supply 14 as the determination signal even when the AC voltage is not normally input.

The determination signal output from the determination signal generation circuit 2 is used for abnormality determination in the processing device 4 described later. When it is determined in the processing device 4 that an abnormality has occurred in the air conditioning device 21, the processing device 4 makes an emergency stop of the air conditioning device 21.

The power supply signal generation circuit 3 generates a power supply signal based on the AC voltage. Specifically, the power supply signal generation circuit 3 is a circuit having a configuration that does not have a switch 11 with respect to the determination signal generation circuit 2. That is, in the power supply signal generation circuit 3, the input terminal of the photocoupler 16 is connected in series to the input unit 15 to which the AC voltage is input from the power supply E, and a closed circuit is formed. Therefore, when the AC voltage is normally input from the power source E, the AC voltage is always input to the photocoupler 16. Further, one end of the output side of the photocoupler 16 is connected to a processing device 4 and a DC voltage power supply (for example, 5V) 17 described later, and the other end is grounded. That is, the power supply signal generation circuit 3 outputs the voltage value (for example, 5V) of the DC voltage power supply 17 when the AC voltage is a negative value, and 0V (ground voltage) when the AC voltage is a positive value. ) Is output.

As described above, when the AC voltage is normally input, the power supply signal generation circuit 3 outputs a pulse signal synchronized with the AC voltage as the power supply signal. That is, the power supply signal is a pulse signal whose value changes when the AC voltage changes beyond a predetermined threshold voltage (for example, 0V). If there is a threshold value on the input side of the photocoupler 16, the threshold voltage will be the threshold value. That is, when the AC voltage changes beyond the threshold voltage (threshold on the input side of the photocoupler 16), the photocoupler 16 operates ON / OFF, and a pulse signal that changes with the change in the AC voltage is generated. ..

The power supply signal output from the power supply signal generation circuit 3 is used for abnormality determination in the processing device 4 described later.

The processing device 4 performs an abnormality determination process based on the determination signal and the power supply signal.

The processing device 4 is composed of, for example, a CPU (central processing unit) (not shown), a memory such as a RAM (Random Access Memory), a computer-readable recording medium, and the like. A series of processing processes for realizing various functions described later is recorded in a recording medium or the like in the form of a program, and the CPU reads this program into a RAM or the like to execute information processing / arithmetic processing. As a result, various functions described later are realized. The program is installed in a ROM or other storage medium in advance, is provided in a state of being stored in a computer-readable storage medium, or is distributed via a wired or wireless communication means. Etc. may be applied. Computer-readable storage media include magnetic disks, magneto-optical disks, CD-ROMs, DVD-ROMs, semiconductor memories, and the like. The processing device 4 is, for example, a microcomputer.

The processing device 4 is supplied with electric power from the power source E. Specifically, the AC voltage output from the power source E is rectified and converted (divided) into a desired DC voltage, and is input to the processing device 4. Therefore, when an abnormality occurs in the power supply E, the AC voltage is not input to the determination signal generation circuit 2, and the power supply to the processing device 4 is also cut off. However, when the rectifier circuit for rectifying the AC voltage has a capacitance component in the DC voltage supply path to the processing device 4, for example, when it is a capacitor input type or when a parasitic capacitance is generated, for example, FIG. As described above, even after the power supply abnormality occurs and the output of the AC voltage is stopped, the processing device 4 may be supplied with power for a period T0 (short period) and the processing device 4 may operate. That is, a time lag occurs between the occurrence of an abnormality in the power supply E and the stoppage of the operation of the processing device 4. Then, the processing device 4 operates in a state where the determination signal at the time of abnormality is output from the determination signal generation circuit 2 to which the AC voltage is not supplied. Therefore, if the abnormality determination is performed only by the determination signal, the power supply is supplied. There is a possibility that the abnormality of E is erroneously determined as the abnormality of the air conditioner 21. Therefore, in the processing device 4 according to the present embodiment, the abnormality determination is performed based on the determination signal and the power supply signal.

FIG. 4 is a functional block diagram showing the functions included in the processing device 4. As shown in FIG. 4, the processing device 4 includes a determination unit 31 and an update unit 32.

The determination unit 31 determines whether or not there is an abnormality in the air conditioner 21 and the power source E based on the determination signal and the power supply signal. Specifically, the determination unit 31 determines the presence or absence of an abnormality in the power supply E based on the power supply signal, and when the abnormality is not determined in the power supply E, the presence or absence of an abnormality in the air conditioner 21 based on the determination signal. To judge.

A case of determining the presence or absence of an abnormality in the air conditioner 21 based on the determination signal will be described. Since the determination signal is generated based on the AC voltage, High and Low are repeatedly changed periodically in synchronization with the AC voltage. Therefore, the determination unit 31 determines whether or not the determination signal is periodically changing, and determines whether or not the determination signal is normally generated. The determination signal is obtained when the switch 11 is in the closed state (a state in which an abnormality has not occurred in the air conditioner 21) or when an abnormality has not occurred in the power supply E (a state in which an AC voltage is being supplied). Generated normally.

Specifically, the determination unit 31 determines whether or not the determination signal is Low (a state in which it is not output at the time of abnormality) more than a predetermined number of times within a predetermined time. In the present embodiment, the determination unit 31 interrupts 500 μsec (detects the state of the determination signal every 500 μsec. Detects 2000 times in 1 second), and when Low is detected 250 times or more in 1 second, the determination signal is normal. That is, it is determined that no abnormality has occurred in the air conditioner 21. On the other hand, the determination unit 31 determines that the determination signal is not normally generated, that is, an abnormality has occurred in the air conditioner 21 when Low is not detected 250 times or more per second with a 500 μsec interrupt. To do. The abnormality determination method in the determination unit 31 is an example, and is not limited to the above method as long as it can be determined that the determination signal is not normally generated.

When it is determined that no abnormality has occurred in the power source E by the abnormality determination process of the power source E based on the power source signal described later, the determination unit 31 performs the abnormality determination process of the air conditioner 21 based on the determination signal. Do.

A case of determining the presence or absence of an abnormality in the power supply E based on the power supply signal will be described. The power supply signal is generated based on the AC voltage, and repeatedly changes High and Low in synchronization with the AC voltage. Therefore, the determination unit 31 determines that the power supply signal is changing periodically (the AC voltage is changing periodically), and determines whether or not an abnormality has occurred in the power supply E. .. The power supply signal is normally generated when there is no abnormality in the power supply E and the AC voltage is normally supplied to the power supply signal generation circuit 3.

Specifically, the determination unit 31 starts measuring the elapsed time when the value of the power supply signal changes, and determines that the power supply E has an abnormality when the elapsed time reaches a predetermined value. The case where the value of the power supply signal changes is the case where the value of the power supply signal is inverted (at least one of the case where the value changes from High to Low and the case where the value changes from Low to High). When the value of the power supply signal is inverted, it means that the AC voltage has changed and no abnormality has occurred in the power supply E.

The predetermined value is set to a value less than the time required for determining the presence or absence of abnormality in the air conditioner 21. In the present embodiment, since the time required for determining the presence or absence of abnormality in the air conditioner 21 is 1 second, the predetermined value related to the time required for determining the presence or absence of abnormality in the power supply E is set to less than 1 second. More preferably, the predetermined value is set to a time sufficiently shorter than the time required for determining the presence or absence of abnormality in the air conditioner 21. It is preferable that the predetermined value is set to a time equal to or more than half a cycle of the AC voltage so that false detection does not occur in a state where the AC voltage is normally supplied.

In the present embodiment, the determination unit 31 starts measuring the elapsed time when the power supply signal changes in response to the change of the AC voltage to the threshold voltage or higher. That is, the determination unit 31 starts measuring the elapsed time when the power supply signal changes from High to Low. In this embodiment, a case where the measurement of the elapsed time is started when the power supply signal changes from High to Low (when the power supply signal changes in response to the change of the AC voltage to the threshold voltage or higher) will be described. However, when the power signal changes from Low to High, or when the power signal changes between Low and High (both the change from High to Low and the change from Low to High), the elapsed time is measured. You may want to start.

An example of the abnormality determination process of the power source E in the processing device 4 will be described with reference to FIG. In FIG. 5, the waveform of the AC voltage, the waveform of the power supply signal, the waveform of the power supply signal (after updating), and the waveform of the elapsed time are shown. The waveform of the power supply signal (after updating) is noise processing performed on the power supply signal, and the processing is performed by the updating unit 32 described later. Further, for the measurement of the elapsed time, a timer is used in FIG. That is, in order to start the measurement of the elapsed time, the timer is reset and the remaining time of the timer becomes zero (time up), so that it is determined that the elapsed time has reached the predetermined value X. The elapsed time is measured not only by the countdown method but also by the countup method.

As shown in FIG. 5, when the power supply E is normal and the AC voltage is input (the region below the time T in FIG. 5), the power supply signal is generated based on the AC voltage. That is, when the AC voltage is a positive value, the photocoupler 16 of the power supply signal generation circuit 3 conducts and Low is output. Since the photocoupler 16 has a threshold value on the input side, when the AC voltage is a positive value (forward voltage on the input side of the photocoupler 16) and becomes a value equal to or greater than the threshold value, the photocoupler 16 Is conductive and Low is output. Then, when the AC voltage becomes a value less than the threshold value (preferably, the AC voltage is a negative value), the photocoupler 16 does not conduct and High is output. Then, noise processing is performed on the power supply signal, and measurement of the elapsed time is started (timer is reset) based on the power supply signal (after updating).

In the present embodiment, since the measurement of the elapsed time is started when the power supply signal changes in response to the change of the AC voltage to the threshold voltage or higher, the elapsed time is changed when the power supply signal changes from High to Low. Measurement is started (timer reset). When the timer is reset, the remaining time decreases with a constant gradient. If the AC voltage is supplied normally, the timer is reset before the time is up. In this way, the elapsed time is measured based on the power supply signal.

It is assumed that an abnormality occurs in the power supply E at time T and the supply of AC voltage is stopped. In this case, since the power supply signal does not change from High to Low after the time T, the time is up at the time T1. When the time is up, the processing device 4 determines that an abnormality has occurred in the power supply E. If it is determined that an abnormality has occurred in the power source E, the abnormality determination process of the air conditioner 21 based on the determination signal is not performed.

In FIG. 5, when an abnormality occurs in the power supply E at time T, the power supply signal becomes High as the AC voltage input disappears. However, if there is a capacitance component (capacitor, parasitic capacitance, etc.) on the AC voltage supply side (AC voltage input side of the power supply signal generation circuit 3), the power supply to the power supply signal generation circuit 3 is immediately due to the influence of the capacitance component. It may not be stopped at. In such a case, as shown in FIG. 6, the value of the power supply signal changes (change from Low to High) with a delay (for example, a second) after the occurrence of the power supply abnormality. However, as in the present embodiment, when the power supply signal changes in response to the change of the AC voltage to the threshold voltage or higher, the measurement of the elapsed time is started (the measurement is started by the change from High to Low). By doing so, it is possible to suppress the influence of the above-mentioned capacitance component and determine the abnormality of the power supply E more quickly.

In this way, the determination unit 31 determines the presence or absence of an abnormality in the power supply E based on the power supply signal, and if it is not determined that an abnormality has occurred in the power supply E, the air conditioner is based on the determination signal. 21 abnormality determination is performed. That is, the determination signal output from the determination signal generation circuit 2 is in an abnormal state in both the abnormality of the air conditioner 21 and the abnormality of the power supply E, so that the power supply output from the power supply signal generation circuit 3 By also using the signal, it becomes possible to more accurately perform the abnormality of the air conditioner 21 and the abnormality of the power supply E.

The update unit 32 detects the value of the power supply signal at a predetermined cycle, generates a correction pulse signal having a value equal to the state value when the power supply signal has the same state value a plurality of times in succession, and corrects the power supply signal. Update as a pulse signal. That is, the update unit 32 updates the power supply signal by performing noise processing on the power supply signal. The noise processing is a processing for reducing the influence of noise contained in the signal. The predetermined cycle is set to a time sufficiently shorter than the half cycle of the power supply signal (half cycle of the AC voltage).

Specifically, as shown in FIG. 7, the update unit 32 performs noise processing on the power supply signal. As shown in FIG. 7, the update unit 32 detects the state of the power supply signal (High or Low) at a predetermined cycle. Then, when the power supply signal has the same state value three times in succession, a correction pulse signal (correction signal) having the same value as the state value is generated. In A in FIG. 7, since the power supply signal is Low three times in a row, the correction pulse signal is Low. Further, in B in FIG. 7, since the power supply signal is High three times in a row, the correction pulse signal is set to High. In FIG. 7C, a case where noise (High noise) is generated in the power supply signal is illustrated. However, the noise is sporadic. Noise is not reflected in the correction pulse signal. In D of FIG. 7, noise (Low noise) is generated in the power supply signal, and similarly, the noise is not reflected in the correction pulse signal.

In this way, when the power supply signal has the same state value a plurality of times in succession, by generating a correction pulse signal having a value equal to the state value, the influence of noise generated in less than the time corresponding to the plurality of times is affected. Can be suppressed. In the present embodiment, the case where the state is equal three times in a row is illustrated, but the number of consecutive times can be similarly applied as long as it is two or more times.

When the update unit 32 generates a correction pulse signal from the power supply signal, the update unit 32 updates the generated correction pulse signal as a power supply signal (after updating). When the power supply signal is updated, the determination unit 31 executes an abnormality determination process using the updated power supply signal.

Next, the abnormality determination process in the processing device 4 described above will be described with reference to FIG. The flow shown in FIG. 8 is repeatedly executed at a predetermined control cycle when the air conditioner 21 is in operation.

First, noise processing is performed on the power supply signal acquired from the power supply signal generation circuit 3 (S101). If the noise level included in the power supply signal is sufficiently low, the noise processing may be omitted.

Next, the presence / absence determination process (power supply abnormality determination process) of the power source E is executed based on the power source signal (after the update if updated) (S102).

When it is determined that the power supply E has an abnormality (YES determination in S102), "power supply abnormality" is output (S103), and the process ends.

When it is determined that there is no abnormality in the power supply E (NO determination in S102), the presence / absence determination process (equipment abnormality determination process) of the air conditioner 21 is executed based on the determination signal (S104). Note that noise processing may be performed on the determination signal.

When it is determined that the air conditioner 21 has an abnormality (YES determination in S104), an "equipment abnormality" is output (S105), and the process ends.

When it is determined that there is no abnormality in the air conditioner 21 (NO determination in S104), "no abnormality" is output (S106), and the process ends.

As described above, according to the abnormality detection system according to the present embodiment, the abnormality detection method thereof, and the air conditioner, a determination signal generation having a switch 11 that opens when an abnormality occurs in the air conditioner 21 is generated. By based on the determination signal generated in the circuit 2 and the power supply signal generated in the power supply signal generation circuit 3, it is possible to improve the detection accuracy of the abnormality of the air conditioner 21 and the abnormality of the power supply E. For example, when an abnormality occurs in the power supply E, the judgment signal is not generated by the judgment signal generation circuit 2 because the AC voltage is not conducted, and the judgment unit 31 is affected by the influence of the capacitance component (capacitor, parasitic capacitance, etc.). Power supply may not be stopped immediately. In such a case, if the determination unit 31 makes an abnormality determination using only the determination signal, it may be erroneously determined that an abnormality has occurred in the air conditioner 21. However, since the determination unit 31 can grasp the abnormality of the power supply E by based on the determination signal and the power supply signal based on the AC voltage, the abnormality of the air conditioner 21 and the abnormality of the power supply E can be determined more accurately. It becomes possible to do.

Further, since the power supply signal is a pulse signal whose value changes when the AC voltage changes beyond a predetermined threshold voltage, it is possible to reflect the periodic change of the AC voltage in the power supply signal. That is, it is possible to reflect in the power supply signal whether or not an abnormality has occurred in the power supply E, and it is possible to easily determine the abnormality of the power supply E from the power supply signal. The threshold voltage is, for example, 0V.

Further, by starting the measurement of the elapsed time when the value of the power supply signal changes, it is possible to determine whether or not the AC voltage changes periodically depending on the length of the elapsed time. That is, when the elapsed time reaches a predetermined value, it can be determined that the AC voltage does not change periodically (abnormality of the power supply E).

Further, it is preferable that the value of the power supply signal is immediately fixed. However, the power supply to the power supply signal generation circuit 3 may not be stopped immediately due to the influence of the capacitance component (capacitor, parasitic capacitance, etc.). In such a case, the power supply may be stopped with a delay after the occurrence of the power supply abnormality, and the value of the power supply signal may change (for example, the change in High and Low in the pulse signal), and the elapsed time may occur. There is a risk that the start of the measurement of the power supply E will be delayed and the abnormality determination of the power supply E will be delayed. Therefore, when the power supply signal changes in response to a change in the AC voltage above the threshold voltage (that is, rising), the effect of the power supply stop delay due to the capacitance component is suppressed by starting the measurement of the elapsed time. It becomes possible to measure the elapsed time. Therefore, it is possible to more accurately determine the power supply abnormality.

Further, when the power supply signal becomes the same state value a plurality of times in succession, a correction pulse signal having the same value as the state value is generated and the power supply signal is updated as the correction pulse signal. Noise processing can be performed. For example, if the AC voltage contains noise, the noise may be reflected in the power supply signal. If noise is reflected in the power signal, the state value may take an abnormal value sporadically. Therefore, it is possible to suppress the influence of an abnormal state value and update the power supply signal by updating the power supply signal so that the value becomes equal to the state value when the state value becomes equal a plurality of times in succession. it can.

The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the invention.

For example, in the above embodiment, the case where the determination signal and the power supply signal are used as pulse waveforms has been described, but the pulse waveform is not limited as long as it is generated based on the AC voltage and the periodicity of the AC voltage can be reflected.

Further, if the power supply signal generation circuit 3 can generate a power supply signal reflecting a periodic change in the AC voltage, the power supply signal generation circuit 3 has the same configuration as the determination signal generation circuit 2 (from the configuration of the determination signal generation circuit 2 to the switch 11). It is not limited to the configuration excluding.

2: Judgment signal generation circuit 3: Power supply signal generation circuit 4: Processing device 11: Switch 12: Input unit 13: Photocoupler 14: DC voltage power supply 15: Input unit 16: Photocoupler 17: DC voltage power supply 21: Air harmony Device 22: Compressor 23: Condenser 24: Expansion valve 25: Evaporator 31: Judgment unit 32: Update unit E: Power supply X: Predetermined value

Claims (9)

It has a switch that opens when an abnormality occurs in the target device, and when the switch is in the closed state, it conducts the AC voltage supplied from the power supply and generates a judgment signal based on the AC voltage. Judgment signal generation circuit and
A power supply signal generation circuit that generates a power supply signal based on the AC voltage,
A determination unit that determines whether or not there is an abnormality in the target device and the power supply based on the determination signal and the power supply signal, which is supplied with electric power from the power source.
Anomaly detection system equipped with. The determination unit determines the presence or absence of an abnormality in the power supply based on the power supply signal, and when the abnormality is not determined in the power supply, the determination unit determines the presence or absence of an abnormality in the target device based on the determination signal. Item 1. The abnormality detection system according to item 1. The abnormality detection system according to claim 1 or 2, wherein the power supply signal is a pulse signal whose value changes when the AC voltage changes beyond a predetermined threshold voltage. The third aspect of claim 3, wherein the determination unit starts measuring the elapsed time when the value of the power supply signal changes, and determines that there is an abnormality in the power supply when the elapsed time reaches a predetermined value. Anomaly detection system. The abnormality detection system according to claim 4, wherein the determination unit starts measurement of the elapsed time when the power supply signal changes in response to a change in the AC voltage to the threshold voltage or higher. The abnormality detection system according to claim 4 or 5, wherein the predetermined value is set to a value less than the time required for determining the presence or absence of an abnormality in the target device. The value of the power supply signal is detected at a predetermined cycle, and when the power supply signal has the same state value a plurality of times in succession, a correction pulse signal having a value equal to the state value is generated, and the power supply signal is corrected. The abnormality detection system according to any one of claims 1 to 6, further comprising an update unit that updates as a pulse signal. With a compressor,
Condenser and
Evaporator and
The abnormality detection system according to any one of claims 1 to 7.
Air conditioner equipped with. When the switch is closed, the switch that opens when an abnormality occurs in the target device is used to conduct the AC voltage supplied from the power supply to generate a judgment signal based on the AC voltage. Judgment signal generation process and
A power supply signal generation process for generating a power supply signal based on the AC voltage, and
A determination step in which power is supplied from the power source and the presence or absence of an abnormality in the target device and the power source is determined based on the determination signal and the power supply signal.
Anomaly detection method with.

Images