JP3216585B2 - Air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To continuously execute an air conditioning operation even in the case of power interruption or voltage drop. SOLUTION: Power interruption or voltage drop of a commercial power of a commercial power source 21 is detected by a power source fault detecting means provided at a power controller 62, and a fault signal is output. When the signal is output, a semiconductor switch 55 is turned ON, and secondary power of a capacitor 14 is supplied to a compressor motor M1. And, when the signal is output continuously for a predetermined time, power interruption for a long time is judged, and a DC switch 51 is closed. And, secondary power of a storage battery 11 is supplied to the motor M1, and an air conditioning operation is continuously conducted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air conditioner for performing an air-conditioning operation by receiving a supply of electric power, and more particularly to a measure against a power failure or a voltage drop.

[0002]

2. Description of the Related Art Conventionally, an air conditioner has a refrigerant circuit in which a compressor, a four-way switching valve, an expansion valve, an outdoor heat exchanger, and an indoor heat exchanger are connected and the circulation direction of the refrigerant is reversible. And configured to perform a cooling operation and a heating operation. Further, there is also a device provided with a power converter as disclosed in JP-A-3-22821 for supplying power to a compressor motor for driving a compressor. That is, the power conversion device includes a converter and an inverter. The converter converts the AC current of the power supply into DC power by the converter, converts the AC power into control power that is AC power of a predetermined frequency by the inverter, and converts the control power to the compressor. Air-conditioning operation is performed by supplying to the motor. By controlling the inverter, the number of rotations of the compressor motor is controlled, and the capacity of the compressor is made variable.

[0003]

However, when the above control power obtained by converting the DC power by the inverter is supplied to the compressor motor to drive the compressor motor, the DC power supplied to the inverter is There is a problem that the compressor motor stops when a power failure or voltage drop occurs.

[0004] That is, if a power failure occurs for a long time, the compressor motor naturally stops because no power is supplied. Further, even in the case of a short-time power failure or a voltage drop such that the compressor motor recovers until it stops completely, the compressor motor stops even though the power failure or the voltage drop has recovered. Specifically, when the voltage of the DC current supplied to the inverter decreases, the rotation speed of the compressor motor also decreases accordingly. Thereafter, when the voltage of the DC current is recovered, the recovery of the rotation speed of the compressor motor cannot follow the recovery of the voltage, and this causes an overcurrent to flow through the inverter, thereby causing an inverter trip and causing the compressor motor to fail. It stops. For this reason, the compressor motor stops due to the inverter trip generated as described above,
There is a problem that the air conditioning operation stops.

On the other hand, a power failure or voltage drop of the DC power supplied to the inverter as described above occurs as follows.

First, when a power failure or a voltage drop occurs in the power supply supplied from the power supply to the converter, a power failure or a voltage drop also occurs in the DC power supplied from the converter to the inverter.

In a storage type air conditioner as disclosed in Japanese Patent Application Laid-Open No. 6-176551, in addition to the above-mentioned power supply current caused by a power outage or a voltage drop, a direct current supplied to an inverter is also required. A voltage drop may occur in the power. This power storage type air conditioner is configured such that an outdoor unit and an indoor unit are connected to a power supply line connected to a power supply, and further includes a storage battery in addition to a compressor motor and an outdoor fan motor, and the AC power from the inverter. The air conditioner is operated by driving the compressor motor in response to the supply.

[0008] During the air conditioning operation of the power storage type air conditioner, the electric power supplied to the inverter is
When switching from the DC power obtained by converting the power supply power of the power supply with the converter to the storage power of the storage battery, the supply of the power supply of the power supply is stopped, and at the same time, the supply of the storage power of the storage battery is started to switch the power. Therefore, a voltage drop has occurred in the DC power supplied to the inverter. In other words, the power of the storage battery is supplied to the inverter after the voltage is boosted by the voltage converter, and since the voltage converter slowly follows the fluctuation of the voltage, the stored power of the storage battery is input to the voltage converter. It takes a certain time from the start until the pressure is sufficiently increased. Therefore, while the voltage of the DC power obtained by converting the power of the power supply by the converter becomes zero almost at the same time as the supply of the power of the power is stopped, it takes time for the voltage of the stored power from the storage battery to be boosted. This causes a voltage drop in the DC power supplied to the power supply.

The present invention has been made in view of the above points, and an object of the present invention is to prevent an air conditioning operation from being stopped due to a power failure or a voltage drop.

[0010]

The present invention relates to a capacitor (1).
By replenishing power from 4), power failure or voltage drop of power supplied to the load (M1) is prevented.

[0011] Specifically, means that the Invention is taken of claim 1, wherein, as shown in FIG. 1, a power supply (21), receiving a source power supplied from the power source (21) as the primary power A power conversion circuit (32) for converting the power to a predetermined control power, a load (M1) for receiving the control power output from the power conversion circuit (32) and driving the air conditioning operation, and a power supply (21). Power storage means (BM) having a capacitor (14) that discharges to drive the load (M1) and supplies secondary power to the load (M1) while receiving and charging the power of the power supply; The power supply abnormality detecting means (64) for outputting an abnormality signal when the power supply power is stopped or the power supply abnormality in which the voltage decreases is detected, and the abnormality signal of the power supply abnormality detection means (64) is inputted. Power supply abnormality detection means (64) during air conditioning operation with power supply power
Outputs an abnormality signal, the secondary power of the capacitor (14) is supplied to the load (M1) to stop the air-conditioning operation (65) . The power supply abnormality detection means (64)
Detects the voltage of the DC section (37) of the power conversion circuit (32),
When the voltage of the DC section (37) falls below a predetermined value, the power supply is determined to be abnormal and an abnormal signal is output.

[0012] Further, the means taken by the invention of claim 2 is the invention according to claim 1 , wherein the power storage means (BM) is:
While receiving and charging the power from the power source (21), the load
Storage battery (11) that discharges to supply secondary power to (M1)
It is provided with.

The means adopted by the third aspect of the present invention is the same as the second aspect , except that the power supply abnormality detecting means (6
4), the secondary power of the storage battery (11) is supplied to the load (M1) when the power failure detection means (64) continuously outputs the failure signal for a predetermined time. And an operation continuation means (66) for continuing the air-conditioning operation.

[0014] Further, the means implemented by the invention according to claim 4 is a power conversion apparatus that receives a power supply (21) as a primary power from the power supply (21) and converts it into a predetermined control power. A circuit (32) and a load (M1) driven to receive the control power output from the power conversion circuit (32) and perform an air-conditioning operation.
While receiving and charging the power supply from the power supply (21), and discharging to drive the load (M1) and discharging the load (M1).
1) a power storage means (BM) including a capacitor (14) for supplying secondary power, and a power failure detection means for outputting a failure signal when the power failure is detected when the power supply stops or the voltage drops. (64) and an abnormality signal of the power supply abnormality detection means (64), and when the power supply abnormality detection means (64) outputs an abnormality signal during the air-conditioning operation by the power supply power, the capacitor (14) Stop avoidance means (65) for supplying the secondary power to the load (M1) to continue the air-conditioning operation , wherein the power storage means (BM) receives the power from the power supply (21) and charges the power. And a storage battery (11) that discharges to supply secondary power to the load (M1) . The power supply abnormality detection means (64) is configured to receive an abnormality signal from the power supply abnormality detection means (64). When an abnormal signal is continuously output for a predetermined time, the secondary power of the storage battery (11) is supplied to the load (M1). And an operation continuation means (66) for continuing the air-conditioning operation.

[0015] The measures taken by the invention of claim 5 are the same as those of claim 2, 3 or 4 except that the load (M1)
Power supply means (63) for substantially simultaneously starting the supply of the secondary power of the power storage means (BM) to the power supply means and stopping the supply of the power supply power to the load (M1).

Further, means for invention was devised in claim 6 is the invention of any one of claims 1 to 5, the power conversion circuit (32), a source power supplied from the power supply (21) A converter unit (33) that receives primary power and converts it into DC power, and an inverter unit (34) that converts DC power output from the converter unit (33) into predetermined AC power, comprises a load (M1 ) Is a compressor motor whose rotation speed is controlled by an alternating current supplied from the inverter section (34).
(M1).

According to the first and fourth aspects of the present invention, the power supply abnormality detecting means (64)
When a power supply abnormality is detected by, the secondary power is loaded from the capacitor (14) of the storage means (BM) by the stop avoidance means (65)
(M1). Therefore, the load (M1) is
1) The power that can drive is always supplied, and the air conditioning operation is continued.

According to the first aspect of the present invention, the voltage detecting section detects the voltage of the DC section (37) of the power conversion circuit (32), and the power supply abnormality detecting means (64) detects the voltage of the DC section (37). When the detected value of the voltage becomes equal to or less than a predetermined value, it is determined that the power supply is abnormal and an abnormal signal is output.

According to the second and fourth aspects of the present invention, a capacitor is provided.
Secondary power is supplied to the load (M1) not only from (14) but also from the storage battery (11).

According to the third and fourth aspects of the present invention, when the power supply abnormality recovers in a short time, the secondary power of the capacitor (14) is supplied to the load (M1), while the power supply abnormality occurs for a long time. In this case, the secondary power of the storage battery (11) is supplied to the load (M1).

[0021] In the present invention of claim 5, wherein the power switching means (6
According to 3), the supply of the power to the load (M1) is stopped and the supply of the secondary power of the power storage means (BM) is started almost simultaneously. The secondary power is supplied from the capacitor (14) of the power storage means (BM) within a predetermined time after the start of the supply of the secondary power, and the storage battery (11) of the power storage means (BM) is supplied after the predetermined time has elapsed.
Is supplied.

[0022] In the sixth aspect of the present invention, the power conversion circuit (3
2) By the AC power output from the inverter section (34),
At the same time that the compressor motor (M1) is driven, the AC power controls the rotation speed of the compressor motor (M1).

[0023]

Thus, according to the present invention, when a power failure or voltage drop occurs in the power supply, these can be detected as power supply abnormalities by the power supply abnormality detecting means (64). Then, when a power supply abnormality is detected, stop avoidance means (65)
With this, the secondary power from the capacitor (14) can be supplied to the load (M1), and the power supplied to the load (M1) can be
Switch from the power supply of 1) to the secondary power of the storage means (BM)
Voltage can be prevented from occurring at the time of reading. others
Because, the power can be prevented stopping power failure or voltage drop caused by load (21) (M1), as a result, it is possible to perform the air conditioning operation stably.

Further, according to the first aspect of the present invention, by monitoring the voltage of the DC section (37) of the power conversion circuit (32), it is possible to reliably prevent a power failure or a power outage or a voltage drop of the power supply. Can be detected.

According to the second and fourth aspects of the present invention,
Load not only from capacitor (14) but also from storage battery (11)
The secondary power can be supplied to (M1), and the air-conditioning operation can be continuously performed even when the power supply abnormality is over a long time.

According to the third and fourth aspects of the present invention,
Capacitor (14) when power supply abnormality is resolved in a short time
The secondary power of the storage battery (11) is supplied to the load (M1) while the secondary power of the storage battery (11) is supplied to the load (M1).
Can be supplied to As a result, the air-conditioning operation can be reliably performed regardless of the duration of the power failure.

According to the fifth aspect of the present invention, the secondary power of the capacitor (14) of the power storage means (BM) is first supplied to the load (M1).
The secondary battery of the capacitor (14) is supplied to the load (M1) while the secondary battery of the capacitor (14) is supplied to the load (M1).
The secondary power of (11) can drive the load (M1),
Thereafter, the secondary power of the storage battery (11) is supplied to the load (M1). For this reason, in an air conditioner equipped with a storage battery (11), a voltage drop that occurs when the power supplied to the load (M1) is switched from the power supply of the power supply (21) to the secondary power of the storage means (BM). Which can prevent the load always
(M1) can be driven, and the air conditioning operation can be stably performed.

According to the invention of claim 6, the AC power converted by the power conversion circuit (32) including the converter section (33) and the inverter section (34) is supplied to the compressor motor (M).
1) and air-conditioning operation can be performed reliably.

[0029]

Embodiments of the present invention will be described below in detail with reference to the drawings.

<< Base Technology of the Present Invention >> First, an air conditioner according to the technology underlying the present invention will be described.
And will be described with reference to FIG. Related to this prerequisite technology
The air conditioner is a heat pump type air conditioner in which one outdoor unit (1A) is connected to one indoor unit (not shown), and a storage battery (11) for supplying secondary power. ) And the controller unit that controls the air conditioning operation
(60), and is configured as a power storage type air conditioner (10).

The outdoor unit (1A) is formed in a package type and includes a compressor, a four-way switching valve, an expansion valve, and an outdoor heat exchanger as a heat source side heat exchanger (not shown). While the outer refrigerant circuit is provided, the indoor unit is provided with an indoor refrigerant circuit including an indoor heat exchanger as a use-side heat exchanger. The refrigerant circuit is configured as a reversible circuit in the refrigerant circulation direction so as to perform a cooling operation and a heating operation.

The outdoor unit (1A) is connected to a power supply line (20) so that commercial power is supplied. The power supply line (20) is connected to a breaker from a commercial power supply (21) as a power supply.
Connected to (22). The commercial power supply 21 supplies three-phase AC commercial power as primary power.

The outdoor unit (1A) is connected to the power line (2
0), and a main power line (30) connected to the main power line (30).
The main electromagnetic relay (31), which is the main contact, and the power conversion circuit
(32) and the compressor motor (M1) are connected in order.

The power conversion circuit (32) includes a converter
(33) and an inverter section (34) provided at a stage subsequent to the converter section (33).

The converter section (33) is a conversion circuit for converting an AC commercial power supply (21) into DC power and outputting the DC power, and includes a rectifier circuit (35) and a smoothing circuit (36). The rectifier circuit (35) is constituted by a diode module having a diode, while the smoothing circuit (36) includes a coil for smoothing a DC voltage and a capacitor (14).

The inverter section (34) includes a converter section
(33) is a conversion circuit that converts the DC power output into a predetermined AC power and supplies the AC power to the compressor motor (M1). For example, a pulse width modulation method is adopted, and an IGBT (Insulate) is used.
It consists of a transistor module equipped with a switching element such as a gate bipolar transistor (Gate Bipolar Transistor). The inverter (34) includes a controller (60).
The inverter unit (34) based on the drive control signal from
A drive circuit (12) configured to drive the inverter is connected to the inverter section (34), whereby control power that is AC power of a predetermined frequency is output from the inverter section (34).

The compressor motor (M1) includes an inverter
A load for driving the compressor by receiving the control power output from (34), wherein the load is controlled to adjust the capacity of the compressor.

The storage battery (11) constitutes a secondary power supply for supplying secondary power to the compressor motor (M1). The storage battery (11) is connected to a main power line (30) via a storage battery charging circuit (40).
Is connected between the circuit breaker (22) and the main electromagnetic relay (31), is configured to be charged by receiving the commercial power from the commercial power supply (21), and is also configured to perform power conversion through the discharge circuit (50). It is connected between the smoothing circuit (36) of the circuit (32) and the inverter section (34), and is configured to supply secondary power to the compressor motor (M1). The circuit (40) and the discharging circuit (50) constitute a power storage means (BM).

In the storage battery charging circuit (40), a storage battery electromagnetic relay (41) and a storage battery converter (42) are sequentially connected. The storage battery electromagnetic relay (41) is configured to be turned on when the storage battery (11) is charged. Further, the storage battery converter (42) is configured to convert AC commercial power into DC power, and reduce the DC power to a voltage suitable for charging the storage battery (11).

The discharge circuit (50) includes a DC switch (51)
And the voltage converter (52) are connected in order. The DC switch (51) is formed of, for example, a thyristor, and is turned on when the storage battery (11) is discharged. The voltage converter (52) is configured to increase the DC power of the storage battery (11) to a voltage suitable for driving the compressor motor (M1).

The controller section (60) includes an air conditioning controller (61) and a power controller (62), and is configured to control an air conditioning operation.

The air-conditioning controller (61) includes detection values of various sensors (not shown) provided in various parts such as a refrigerant circuit for detecting an operation state, and a remote controller (13).
And the set temperature signal from. The air-conditioning controller (61) outputs a drive control signal to the drive circuit (12) based on the detected value and the set temperature signal to control the number of revolutions of the compressor motor (M1) and to control the expansion valve. The air-conditioning operation is controlled by controlling the opening degree and a fan provided in the indoor / outdoor unit.

The power controller (62) includes a power switching means (63), and based on an operation signal and a stop signal from the remote controller (13), the main electromagnetic relay (31) and the electromagnetic relay (41) for the storage battery. Is configured to be controlled.

The power switching means (63) receives the switching signal for switching the power supply from the commercial power to the secondary power of the storage battery (11), and receives the switching signal from the storage battery (11) to the compressor motor (M1). A predetermined time after the start of the supply of the next electric power, the supply of the commercial electric power to the compressor motor (M1) is stopped. In other words, storage battery (11) at night
During the daytime when the power demand of the commercial power in the daytime is the highest, the air-conditioning operation is performed by receiving only the secondary power from the storage battery (11), so-called peak cut operation is performed. The power controller (62) outputs the switching signal based on the set schedule, and the power switching means (63) performs the switching operation in response to the switching signal. The remote control (13) may be configured to output a switching signal to the power switching means (63), and the power switching means (63) may perform a switching operation by operating the remote control (13). .

-Operating operation- The operating operation of the power storage type air conditioner (10) according to the base technology of the present invention will be described.

First, the operation at the time of the normal operation for performing the air-conditioning operation performed by receiving the commercial power from the commercial power supply (21) will be described. When an operation signal is input from the remote controller (13),
This operation signal is transferred to the power controller (62) via the air conditioning controller (61), and the power controller (62)
Turns on the main electromagnetic relay (31). This main electromagnetic relay (3
By turning on 1), commercial power is input to the rectifier circuit (35) of the converter section (33) and converted to DC power,
The DC power is smoothed by the smoothing circuit (36) and input to the inverter section (34).

On the other hand, the air-conditioning controller (61) derives the required air-conditioning load based on the detection values of various sensors provided in the air conditioner (10) and the temperature set value from the remote controller (13). Then, the expansion valve opening and fan rotation speed are controlled and the rotation speed command value of the compressor motor (M1) is output to the drive circuit (12) so as to exert the air conditioning capacity that satisfies the derived air conditioning load. . The drive circuit (12)
Upon receiving the rotation speed command value from the air conditioning controller (61), the control signal is output to the inverter section (34) so that the rotation speed of the compressor motor (M1) becomes the rotation speed command value. Then, the inverter (34) uses the control signal to control the inverter (3
The control element 4) outputs control power, which is a predetermined AC power, by the on / off control of the switching element, thereby controlling the rotational speed of the compressor motor (M1) to be the above-mentioned rotational speed command value.

Next, a description will be given of an operation during a power storage operation for performing an air-conditioning operation by receiving the secondary power of the storage battery (11). When an operation signal is input from the remote controller (13), the operation signal is transmitted to the air-conditioning controller. The signal is transferred to the power controller (62) via (61), and the power controller (62) turns on the DC switch (51). When the DC switch (51) is turned on, the secondary power of the storage battery (11), which is DC power, is boosted by the voltage converter (52) and then the inverter (3).
4) Enter in. The operation of the air conditioning controller (61) is the same as that in the normal operation. The switching operation from the normal operation to the power storage operation is performed by a power switching unit (63).
It is performed by

The switching operation will be described first.
During normal operation, a switching signal is input to the power switching means (63) from the power controller (62). At this time, the main electromagnetic relay (31)
Is on, while the DC switch (51) is off. Then, the power switching means (63) switches the DC switch (5) while keeping the main electromagnetic relay (31) on.
1) is turned on, and after a predetermined time has elapsed, the main electromagnetic relay (31) is turned off, thereby switching from the normal operation to the power storage operation. Here, the predetermined time is equal to the voltage converter (5
2) Start supplying DC power to the storage battery (11) to
This is the time required until the voltage of the electric power output from the voltage converter (52) reaches a voltage suitable for driving the compressor motor (M1).

In the daytime, the normal operation and the power storage operation are performed. In the nighttime, a stop signal is generally input from the remote control (13) to stop the air-conditioning operation of the storage battery (11). A charging operation is performed. That is, the power controller (62) turns off the main electromagnetic relay (31) and turns on the storage battery electromagnetic relay (41). Then, the storage battery charging circuit (40) converts the commercial power into DC power and reduces the voltage to a voltage suitable for charging the storage battery (11), thereby charging the storage battery (11).

[0051] Embodiments of the present invention "embodiment of the present invention", as shown in FIGS. 3 and 4, the onset
In the storage means (BM) according to the premise technology of Ming , the storage battery (11)
In addition to installing a capacitor (14), the power controller (62) has a power supply abnormality detection means (64) and a stop avoidance means (65).
And operation continuation means (66).

The capacitor (14) constitutes a secondary power supply for supplying secondary power to the compressor motor (M1), similarly to the storage battery (11). The capacitor (14) is connected between the breaker (22) of the main power supply line (30) and the main electromagnetic relay (31) via a capacitor charging circuit (45), and is supplied with commercial power from a commercial power supply (21). And connected between the smoothing circuit (36) of the power conversion circuit (32) and the inverter section (34) via the semiconductor switch (55),
It is configured to supply secondary power to the compressor motor (M1), and in addition to the storage battery (11), the storage battery charging circuit (40) and the discharging circuit (50), the capacitor (14) and the capacitor charging circuit (45) ) And a semiconductor switch (55) to store electricity (BM)
Is composed. The capacitor (14) is provided with a capacity capable of storing electric power required to drive the compressor motor (M1) for several seconds in order to cope with a so-called momentary power failure.

In the capacitor charging circuit (45), a capacitor electromagnetic relay (46) and a capacitor converter (47) are sequentially connected. Electromagnetic relay for the capacitor (46)
Are turned on when the capacitor (14) is charged and turned off when the capacitor (14) is discharged. Further, the capacitor converter (47) is configured to convert AC commercial power into DC power and boost the voltage of the DC power.
This is because the capacitor (14) is directly connected to the power conversion circuit (32)
This is because it is necessary to boost the DC power for charging the capacitor (14) to a voltage suitable for driving the compressor motor (M1).

The semiconductor switch 55 is composed of a transistor, and is configured to cause the transistor to perform a switching operation.

The power supply abnormality detecting means (64) is connected to a DC section (37) between the smoothing circuit (36) of the power conversion circuit (32) and the inverter section (34). The voltage of (37) is detected. If the voltage of the DC section (37) is lower than a predetermined value, it is determined that a power failure or a voltage drop has occurred, and an abnormal signal is output.

The stop avoiding means (65) is configured to receive an abnormality signal from the power supply abnormality detecting means (64), and upon receiving the abnormality signal from the power supply abnormality detecting means (64), activates the semiconductor switch (55). When turned on, the secondary power of the condenser (14) is supplied to the compressor motor (M1).

The operation continuation means (66) is configured to receive an abnormality signal of the power supply abnormality detection means (64), and when the abnormality signal of the power supply abnormality detection means (64) is continuously inputted for a predetermined time. Turn on the DC switch (51) and turn on the storage battery (11).
The secondary power is configured to be supplied to the compressor motor (M1).

-Operational operation- First, during the normal operation of performing the air-conditioning operation performed by receiving the commercial power from the commercial power supply (21), and during the power storage operation performing the air-conditioning operation performed by receiving the secondary power of the storage battery (11). The operation described above, the switching operation from the normal operation to the power storage operation by the power switching means (63), and the charging operation of the storage battery (11) at night are the same as those in the base technology of the present invention .

Next, during normal operation, the commercial power supply (21)
The operation performed when a power failure or voltage drop occurs in the commercial power will be described with reference to FIG . In FIG. 5 , the vertical axis represents the DC section voltage which is the voltage of the DC section (37) of the power conversion circuit (32), and the horizontal axis represents time.

First, the operation in the case where an instantaneous power failure or instantaneous voltage drop occurs in the commercial power will be described.
When the normal operation is performed by receiving the commercial power of 1), the DC section voltage is the voltage (V0). In this state, if an instantaneous power failure or instantaneous voltage drop occurs at time (t0), the DC section voltage decreases, and at time (t1), the voltage (Vt) decreases.
When the power supply abnormality is lowered, the power supply abnormality detection means (64) determines that a power supply abnormality has occurred and outputs an abnormality signal. When the abnormality signal of the power supply abnormality detecting means (64) is input to the stop avoiding means (65), the stop avoiding means (65) is activated by the semiconductor switch (5).
5) is turned on, and the secondary power of the capacitor (14) is supplied, so that the DC section voltage is maintained at the voltage (Vc). afterwards,
At the time (t2), the instantaneous power failure or the instantaneous voltage drop is resolved, and when the supply of the commercial power is resumed, the DC section voltage increases.When the voltage (Vt) reaches the voltage (Vt) at the time (t3), the power supply abnormality detecting means (64) Determines that the power supply abnormality has been resolved, stops outputting the abnormality signal, and the power controller (62) turns off the semiconductor switch (55). That is, if no measures are taken in the event of an instantaneous power failure or instantaneous voltage drop in commercial power, the DC section voltage will drop to the voltage (V1), but the stop avoidance means (65) By the operation of
The DC section voltage is maintained at the voltage (Vc).

Next, the operation when a power failure occurs for a long time will be described. First, the above-mentioned momentary power failure occurs until the DC section voltage drops due to the occurrence of the power failure, the power failure detection means (64) detects the abnormality signal, and the stop avoidance means (65) turns on the semiconductor switch (55). Alternatively, the operation is the same as that in the case of the instantaneous voltage drop. Then, in the case of an instantaneous power failure or an instantaneous voltage drop, the DC section voltage subsequently rises again, whereas in the case of a long-time power failure, the DC section voltage does not rise. The abnormal signal of (64) is continuously output. Therefore, when the abnormality signal of the power supply abnormality detection means (64) is continuously output for a predetermined time, the operation continuation means (66) determines that a power failure for a long time has occurred, and the DC switch ( 51) Turn on.
As a result, the secondary power of the storage battery (11) is reduced by the compressor motor (M
1) and air-conditioning operation is continued.

-Effects of Embodiment- According to this embodiment, the operation can be switched while the voltage of the DC power supplied to the inverter section (34) is kept substantially constant. Further, according to the present embodiment, by monitoring the voltage of the DC section (37) of the power conversion circuit (32), it is possible to detect an instantaneous power failure or an instantaneous voltage drop of the commercial power supply (21) . As a result, an inverter trip due to the instantaneous power failure or instantaneous voltage drop can be prevented, and the air-conditioning operation can be stably performed without stopping the compressor motor (M1).

Further, even in the case of a power failure for a long time, the secondary power from the storage battery (11) can be supplied to the compressor motor (M1), so that the air conditioning operation can be performed without stopping the compressor motor (M1). Can be performed stably.

-Modification of Embodiment- In this embodiment, the power controller (62) is provided with a stop avoiding means (65) and an operation continuation means (66), and a capacitor is provided for an instantaneous power failure or an instantaneous voltage drop. 2 from (14)
While the secondary power is supplied to the compressor motor (M1), the air conditioning operation is continued by supplying the secondary power from the storage battery (11) to the compressor motor (M1) in the event of a long-term power failure. However, the power controller (62) is not provided with the operation continuation means (66), and the power controller (62)
Is configured to turn on the DC switch (51) when an abnormality signal of the power supply abnormality detection means (64) is input, and the storage battery (11)
May be supplied to the compressor motor (M1).

According to this, when a power failure or a voltage drop occurs, the secondary power from the capacitor (14) and the storage battery (11) is supplied to the compressor motor (M1) to continue the air-conditioning operation. During the time from the start of the supply of the secondary power of the storage battery (11) to the time when the voltage is sufficiently boosted by the voltage converter (52), the secondary power from the capacitor (14) is supplied to the compressor motor (M1). As a result, the voltage of the DC section (37) of the power conversion circuit (32) does not decrease, and as a result, the compressor motor (M1) is driven to perform the air conditioning operation without causing an inverter trip. Can be.

[0066]

Other Embodiments of the Present Invention
While the storage battery (11) is charged at night, the air conditioner is operated by receiving only the secondary power from the storage battery (11) during a predetermined time period during the day, that is, a so-called peak cut operation is performed. In addition, while the storage battery (11) is charged at night, air conditioning operation is performed during a predetermined time period during the daytime by receiving both the commercial power of the commercial power supply (21) and the secondary power from the storage battery (11). That is, a so-called peak shift operation may be performed.

In the above embodiment, the capacitor (14) having a capacity capable of air-conditioning operation for several seconds is provided in order to cope with an instantaneous power failure or an instantaneous voltage drop. Alternatively, a condenser having a capacity capable of air-conditioning operation for several tens of minutes may be provided.

When such a large-capacity capacitor is provided, power (W0) is supplied from the commercial power source (21) as shown in FIG.
While performing the peak shift operation while receiving the secondary power of the storage battery (11) while receiving the secondary power of the storage battery (11), the normal storage power (upper limit of the secondary power supplied from the storage battery (11) in a normal state) Even when more power is required than W1), stable air-conditioning operation is possible. For example, when air conditioning operation is performed by two air conditioners, one of them breaks down, and the air conditioning capacity that had been exhibited by the two air conditioners until then is exhibited by the single air conditioner. It is assumed that it must be done. In the case described above, the excess power (W1) exceeding the normal stored power (W1)
2) is supplied from a capacitor.

In other words, in the case described above, if an attempt is made to deal with only the secondary power of the storage battery (11), it is necessary to supply excess power (W2) in addition to the normal storage power (W1). As a result, the performance of the storage battery (11) is greatly deteriorated. When the storage battery (11) has a large storage capacity in advance, the problem of performance deterioration due to rapid discharge as described above is solved, but the storage battery (11) cannot be used for normally required power. The storage capacity of the battery becomes excessive, which leads to an increase in the size of the storage battery (11). On the other hand, when a large-capacity capacitor is provided, the above-described problem does not occur, and it is possible to cope with various situations while performing stable air-conditioning operation.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is an explanatory diagram showing a configuration of an air conditioner according to a base technology of the present invention.

FIG. 3 is an explanatory diagram illustrating a configuration of an air-conditioning apparatus according to an embodiment of the present invention.

FIG. 4 is an explanatory diagram illustrating a configuration of a power controller of the air-conditioning apparatus according to the embodiment of the present invention.

FIG. 5 is a graph for explaining an operation of a stop avoidance unit of the air-conditioning apparatus according to the embodiment of the present invention.

FIG. 6 is a graph for explaining an operation state of an air conditioner according to a modified example of the embodiment of the present invention.

[Explanation of symbols]

 (11) Storage battery (14) Capacitor (21) Commercial power supply (power supply) (32) Power conversion circuit (33) Converter section (34) Inverter section (37) DC section (63) Power switching means (64) Power failure detection means (65) Stop avoidance means (66) Operation continuation means (M1) Compressor motor (load) (BM) Power storage means

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) F24F 11/02 103 F25B 1/00 341

Claims (6)

(57) [Claims] 1. A power supply (21), and a power conversion circuit (32) for receiving power supply power supplied from the power supply (21) as primary power and converting it into predetermined control power
A load (M1) driven to perform air-conditioning operation by receiving the control power output by the power conversion circuit (32); and receiving and charging power from the power source (21),
Power storage means having a capacitor (14) that discharges to drive the load (M1) and supplies secondary power to the load (M1)
(BM) and power supply abnormality detection means (6) that outputs an abnormality signal when the power supply stops or the power supply abnormality that detects a drop in voltage is detected.
4), and an abnormality signal of the power supply abnormality detection means (64) is inputted. When the power supply abnormality detection means (64) outputs an abnormality signal during the air conditioning operation using the power supply power, the capacitor (1
Secondary power 4) supplied to the load (M1) and a stop avoidance means for continuing the air conditioning operation (65) to said power source abnormality detecting means (64), the DC portion of the power conversion circuit (32) ( 37) An air conditioner characterized by detecting the voltage of (37), and when the voltage of the DC section (37) falls below a predetermined value, judges that the power supply is abnormal and outputs an abnormal signal. 2. The air conditioner according to claim 1, wherein the power storage means (BM) receives and charges the power supply from the power supply (21) while supplying secondary power to the load (M1). An air conditioner comprising a discharging storage battery (11). 3. An air conditioner according to claim 2, wherein an abnormality signal of the power supply abnormality detection means (64) is inputted, and the power supply abnormality detection means (64) continues the abnormality signal for a predetermined time. The air conditioner is provided with operation continuation means (66) for supplying secondary power of the storage battery (11) to the load (M1) to continue the air-conditioning operation. 4. A power supply (21), and a power conversion circuit (32) for receiving power supply power supplied from the power supply (21) as primary power and converting it into predetermined control power.
A load (M1) driven to perform air-conditioning operation by receiving the control power output by the power conversion circuit (32); and receiving and charging power from the power source (21),
Power storage means having a capacitor (14) that discharges to drive the load (M1) and supplies secondary power to the load (M1)
(BM) and power supply abnormality detection means (6) that outputs an abnormality signal when the power supply stops or the power supply abnormality that detects a drop in voltage is detected.
4), and an abnormality signal of the power supply abnormality detection means (64) is inputted. When the power supply abnormality detection means (64) outputs an abnormality signal during the air conditioning operation using the power supply power, the capacitor (1
4) The secondary power of (4) is supplied to the load (M1) to stop the air-conditioning operation and stop avoidance means (65) is provided . The power storage means (BM) receives the power from the power supply (21) and charges the power. to one load includes a storage battery (11) to discharge to supply secondary power (M1), the abnormal signal of the power supply abnormality detecting means (64) is configured to enter, power source abnormality detecting means (64 ) Continuously outputs the abnormal signal for a predetermined period of time, supplies the secondary power of the storage battery (11) to the load (M1) and continues the air-conditioning operation. An air conditioner characterized by: 5. The air conditioner according to claim 2, 3 or 4 , wherein the supply of secondary power of the power storage means (BM) to the load (M1) is started, and the supply of power to the load (M1) is stopped. An air conditioner characterized by comprising a power switching means (63) for substantially simultaneously performing the above. 6. The air conditioner according to claim 1, wherein the power conversion circuit receives the power supplied from the power supply as primary power and converts the power into DC power. And a converter (34) for converting the DC power output from the converter (33) into a predetermined AC power.The load (M1) is connected to the inverter (34). An air conditioner characterized by being a compressor motor (M1) whose rotation speed is controlled by supplied alternating current.