JPH11332123A - Accumulating type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify a constant-current circuit and permit the delicate system tuning, without the reconstruction of hardware at an installation site. SOLUTION: A reference current memory unit 105 consisting of a flash memory, in which a reference current value is stored, a PWM output unit 106, an A/D conversion unit and a control output unit 104 are provided in a microcomputer 27C of which a constant current control unit consists. A DC current transformer CT2 which detects the current of an accumulator and an integral circuit 102 which integrates the PWM signal of the PWM output unit 106 are connected to the input side of an operational amplifier 101. The output side of the operational amplifier 101 is connected to the A/D conversion unit. If the PWM output unit 106 receives a predetermined reference current value from a reference current memory unit 105, it outputs a reference voltage corresponding to the reference current to the operational amplifier 101 through the integral circuit 102.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power storage type air conditioner having a power storage means, and more particularly to a constant current control of the power storage means at the time of charging or discharging.

[0002]

2. Description of the Related Art Conventionally, air conditioners have been disclosed in
As disclosed in Japanese Patent Application Publication No. 137,651, there is a device provided with a storage battery. This type of power storage type air conditioner
While a converter, a smoothing capacitor, an inverter, and a compressor motor are sequentially connected to a commercial power supply via a transformer, a storage battery is connected to the transformer via a rectifier circuit and a thyristor, and the storage battery is connected to a stage preceding the inverter. It is configured.

[0003] Normally, the commercial power is supplied from the commercial power source to the compressor motor. On the other hand, during a power peak when the power demand becomes maximum, for example, during the daytime in the middle of summer, secondary power is supplied from the storage battery to the compressor motor. Supply to suppress the use of commercial power.

In a storage type air conditioner, charging is performed while a charging current is maintained at a constant value during charging, and a constant current is supplied during discharging to supply secondary power to a compressor motor while maintaining a discharging current at a constant value. Control is performed. The charging method of the storage battery varies depending on the type of the storage battery to be used. In general, in the case of a lead battery, a two-stage constant current charging method in which charging is performed at a two-stage current value in consideration of charging efficiency and battery life. Is used. On the other hand, regarding the discharge, since the discharge current changes greatly depending on the current consumption on the load side (air conditioner side), constant current control is often performed by switching about three levels of current values according to the load. That is, the constant current control in the power storage type air conditioner is not performed based on a single current value, but is performed while appropriately switching a plurality of stages (a plurality of types) of current values.

In the conventional air conditioner of the storage type, constant current control is performed by a constant current control circuit as shown in FIG. 5, for example. In order to generate a predetermined reference voltage, the constant current control circuit includes a reference voltage generation circuit (2) including reference voltage changeover switches (Q1 to Q5) and reference voltage setting resistors (R1 to R7).
03) is provided.

Next, the operation of the constant current control circuit will be described. The reference voltage storage unit (205) of the control microcomputer (204) selects a predetermined reference voltage value according to the operation state from a reference voltage (current) table stored in advance, and outputs a signal of the reference voltage value to the reference voltage. Output to the switching unit (206). Reference voltage switch (20
6) outputs a select signal corresponding to the selected reference voltage value to the reference voltage generation circuit (203), and as a result, a predetermined reference voltage is supplied to the operational amplifier (202). Operational amplifier (20
In 2), the charging current or the discharging current detected by the DC current transformer (201) is input as a current detection signal. The difference between the current detection signal and the reference voltage is amplified by the operational amplifier (202), and the difference is output as an error signal to the control microcomputer (204).
Is input to the A / D converter (207). Then, the control output unit (208) controls the converter based on the error signal and the reference voltage value so that the charging current or the discharging current becomes a predetermined value.

[0007]

However, the above constant current control circuit requires a complicated reference voltage generation circuit (203), and outputs a select signal to the control microcomputer (204) by the number of reference voltages. Because of the need to provide ports, the structure was complicated. In addition, trimming of the reference voltage requires changing hardware constants, that is, changing components, and it has been very time-consuming to tune the system on site.

[0008] The present invention has been made in view of the above points, and an object thereof is to simplify a constant current control circuit and perform delicate system tuning without modifying hardware at an installation site. To make it possible.

[0009]

In order to achieve the above object, the present invention employs PWM output means and generates a reference voltage for constant current control based on the PWM output of the PWM output means.

More specifically, as shown in the block diagram of FIG. 1, the means implemented by the first invention includes a constant current control circuit (25) for controlling the charge current and the discharge current of the power storage means (11). In the power storage type air conditioner provided, the constant current control circuit (25)
Is a reference current storage means (105) storing a reference current value,
PWM output means (106) for receiving a reference current signal from the reference current storage means (105) and outputting a PWM signal corresponding to the reference current value, a predetermined reference current value and a current value of the power storage means (11). Control output means (104) for receiving an error signal indicating the difference between the power storage means (11) and outputting a control signal for controlling the power adjustment means (45) for adjusting the current of the power storage means (11) so that the difference disappears
Current detection means (CT2) for detecting the current of the power storage means (11)
Reference voltage generating means (102) for outputting a reference voltage based on the output of the PWM output means (106);
An error output means (101) that receives the current detection signal from (CT2) and the reference voltage of the reference voltage generation means (102), and outputs an error signal to the control output means (104). It was done.

According to the above-mentioned invention specific matter, the reference current storage means (105) outputs a predetermined reference current signal corresponding to the charging operation or the discharging operation to the PWM output means (106). PWM
The output means (106) adjusts a PWM cycle, a duty ratio, and the like so that a voltage output to the error output means (101) through the reference voltage generation means (102) becomes a predetermined reference voltage.
It outputs a WM signal. This PWM signal is converted to a reference voltage through reference voltage generation means (102),
(101) is input. On the other hand, the current value of the power storage means (11) detected by the current detection means (CT2) is input to the error output means (101) as a current detection signal. And error output means (101)
In, the difference between the current of the power storage means (11) and the reference current is calculated, and the difference is output to the control output means (104) as an error signal. The control output means (104) which has received the error signal outputs a control signal to the power adjusting means (45) so as to adjust the current of the power storage means (11) so that the difference is eliminated.

A second aspect of the present invention is the first aspect, wherein the reference current storage means (105) and the PWM output means are provided.
(106) and the control output means (104)
(27C), the microcomputer (27C) for communicating between the PWM output means (106) and the reference voltage generating means (102).
Are configured by one PWM output port (110).

According to the above-described invention, the switching of the reference voltage is performed by changing the PWM signal, so that a plurality of output ports are not required, and the P-output of the PWM output unit (106) is not required.
The WM signal is output to the reference voltage generation means (102) through one PWM output port (110). Therefore, the circuit configuration is simplified.

According to a third aspect of the present invention, in the second aspect, the reference voltage generating means is a PWM output means (10
Integrator (102) that integrates the output of 6) and outputs a reference voltage
It is to be constituted by.

According to the above-mentioned invention specifying means, the PWM output means
The PWM signal output from (106) is integrated by the integration circuit (102), converted into a reference voltage, and input to the error output means (101).

According to a fourth aspect of the present invention, in any one of the second and third aspects, the error output means comprises an operational amplifier (101).
And the control output means (104) are a microcomputer (27C)
Are connected via an A / D conversion section (103) provided in the first section.

According to the above-mentioned invention, the operational amplifier (10
1), the current detection signal of the current detection means (CT2) and the reference voltage of the reference voltage generation means (102) are input, and the operational amplifier (10
1) The difference between the current value of the power storage means (11) and the reference current value is output to the A / D converter (103) of the microcomputer (27C) as an error signal composed of an analog signal. The A / D conversion unit (103) receiving the error signal converts the signal into a digital signal and outputs the digital signal to the control output unit (104).

The means adopted by the fifth invention is the reference current storage means (1) according to any one of the second to fourth inventions.
05) is to be constituted by a flash memory.

According to the above aspect of the invention, a plurality of reference current values can be stored with a simple and inexpensive configuration.
Subtle system tuning at the installation site becomes easy without modifying the hardware.

[0020]

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

-Overall Configuration of Air Conditioner-As shown in Figs. 2 and 3, a power storage type air conditioner (10) according to the present embodiment has one outdoor unit (1A) and one indoor unit. This is a heat pump type air conditioner to which (1B) is connected. The power storage type air conditioner (10) is a power storage unit containing a storage battery (11) serving as power storage means for supplying secondary power to a compressor motor (M1) of the outdoor unit (1A).
(BM).

The outdoor unit (1A) is formed in a package type and includes a compressor (not shown), a four-way switching valve, an expansion valve, and an outdoor heat exchanger serving as a heat source side heat exchanger. An outer refrigerant circuit is accommodated. On the other hand, the indoor unit (1B) houses a refrigerant circuit on the indoor side including an indoor heat exchanger as a use-side heat exchanger. The outdoor unit (1A) and the indoor unit (1B) are connected by a communication pipe (1C) to form a refrigerant circuit. And
In the refrigerant circuit, the refrigerant circulation direction is reversible by the switching operation of the four-way switching valve, and the mode is switched between the cooling operation and the heating operation.

-Configuration of Electric Circuit-The power storage unit (BM) includes a power storage circuit (40), and this power storage circuit (40) is connected to a power supply line (20) as shown in FIG. In the power supply line (20), a commercial power supply (21) as a power supply and a breaker (22) are sequentially connected. The commercial power supply (21) supplies 200 V three-phase AC commercial power as primary power.

The power storage circuit (40) includes a power storage power line (41) connected to a power line (20) by a first terminal block (40A) disposed in a part of a casing of the power storage unit (BM). ing. The current transformer (CT),
Charging electromagnetic relay (42), power conversion circuit (43), storage battery (1
A DC current transformer (CT2) as a current detecting means for detecting the current of 1) and a storage battery (11) are sequentially connected.

The current transformer (CT) is connected to a commercial power supply (2
Detects the input current from 1) and outputs the detected current value. The DC current transformer (CT2) detects a charging current of the storage battery (11) during charging, and detects a discharging current of the storage battery (11) during discharging, and outputs a current detection signal.

The charging electromagnetic relay (42) includes a storage battery (11)
Turned on when charging.

The power conversion circuit (43) includes a charging AC / DC
The converter unit (44) and the DC / DC converter unit (45) are sequentially connected and configured. The AC / DC converter section (4
4) is a conversion circuit for converting AC commercial power to DC power and outputting the DC power, and includes a rectifier circuit (46), a choke coil (47), and a smoothing circuit (48). The rectifier circuit (46) is configured by a diode module having a diode. The choke coil (47) and the smoothing circuit (48) are for smoothing a DC voltage, and the smoothing circuit (48) includes a capacitor.

The DC / DC converter section (45) includes an IGBT (Insulate Gate Bipolar Transistor) and a diode for charging, and an IGBT and a diode for discharging. The DC / DC converter unit (45) stores the DC power from the AC / DC converter unit (44) when charging the storage battery (11).
(11) Step down to DC power corresponding to charging
At the time of discharging of (11), the power stored in the storage battery (11) is configured to be boosted to DC power corresponding to driving of the compressor motor (M1).

The storage battery (11) is composed of a sealed type granular lead battery, and both ends are connected to a DC / DC converter (45). The storage battery (11) is, for example, about 130 V when fully charged,
Approximately 98V at the end of discharge, secondary power is supplied to compressor motor
(M1) constitutes a secondary power supply. Then, the storage battery (11) is charged by receiving power from the commercial power supply (21) from the AC / DC converter (44) and the DC / DC converter (45).

A second terminal block (40B) is provided in a part of the casing of the power storage unit (BM). A branch power supply line (49) branched from the power storage power supply line (41) is connected to the second terminal block (40B). The branch position of the branch power supply line (49) is on the downstream side of the current transformer (CT) and on the upstream side of the charging electromagnetic relay (42).

The power storage unit (BM) contains a charge / discharge controller (70). This charge / discharge controller
(70) is a controller for controlling charging or discharging of the storage battery (11). The charge / discharge controller (70) includes a current detection circuit (26) connected to the DC current transformer (CT2), a voltage detection circuit (28) for detecting the voltage of the storage battery (11), and a CPU (71).
And a converter drive circuit (72). CPU
(71) has a constant current control unit (27) and a charge / discharge end detection unit (29)
Is provided.

The current detection circuit (26) receives a current detection signal from the DC current transformer (CT2), and uses a difference between a voltage corresponding to the current detection signal and a reference voltage as an error signal as a constant current control unit (27). ). The constant current control section (27) outputs a drive control signal to the converter drive circuit (72) based on the error signal. Converter drive circuit (7
2) controls the DC / DC converter section (45) based on the drive control signal so that the charging current or the discharging current of the storage battery (11) becomes a predetermined value. That is, the DC / DC converter unit (45) adjusts the charging current or the discharging current flowing through the storage battery (11) so as to have a predetermined value.

The charge / discharge completion detecting section (29) is a control section for terminating the charging operation or the discharging operation. Specifically, the charging / discharging end detection unit (29) performs the voltage detection circuit (2
When the detected voltage value of 8) rises to a predetermined charging end voltage value, the charging operation is ended. Further, when the detected voltage value decreases to a predetermined discharge end voltage value after the start of the discharge operation, the discharge operation is terminated.

As will be described later, a DC current transformer (CT2), a current detection circuit (26) and a constant current control unit (27)
Constitutes a constant current control circuit (25) which is a feature of the present embodiment.

Next, the electric circuit of the outdoor unit (1A) will be described. This outdoor unit (1A) includes a motor drive circuit (30). The motor drive circuit (30) includes a main power supply line (31) connected to a power supply terminal block (30A) provided in a part of a casing of the outdoor unit (1A). To the main power supply line (31), an electromagnetic relay (32) and an AC / DC converter section (34) similar to the above-described power storage circuit (40) are sequentially connected.

The rectifier circuit (3) of the AC / DC converter section (34)
6), the choke coil (37) and the smoothing circuit (38) are the same as those of the power storage circuit (40) described above. Therefore, the description is omitted here.

An inverter section (35) is provided on the subsequent stage side of the converter section (34). The inverter unit (35) is a conversion circuit that converts DC power output from the converter unit (34) into predetermined AC power and supplies the AC power to the compressor motor (M1), and employs a pulse width modulation method. IGBT (Insulate
It consists of a transistor module equipped with a switching element such as a gate bipolar transistor (Gate Bipolar Transistor).

The compressor motor (M1) is connected to an inverter (3
This is a load that drives the compressor by receiving the control power output from 5), and the number of revolutions is controlled to adjust the capacity of the compressor.

The outdoor unit (1A) houses an outdoor controller (80). This outdoor controller (80)
Has an inverter drive circuit (82). The inverter drive circuit (82) drives the inverter (35) based on a drive control signal from the CPU (81). That is,
The inverter (35) outputs control power, which is AC power of a predetermined frequency, based on a drive signal of the inverter drive circuit (82).

The second terminal block (40B) of the power storage circuit (40) and the power supply terminal block (30A) of the motor drive circuit (30) configured as described above.
And are connected by a communication power line (90). That is,
The outdoor unit (1A) is configured to be supplied with power via a power storage unit (BM). Further, since the current transformer (CT) is located at a stage prior to the branch power supply line (49), the current transformer (CT) detects the total current supplied to the power storage circuit (40) and the motor drive circuit (30).

Further, a power storage circuit (40) and a motor drive circuit (30)
Are connected by a secondary power supply line (50). The secondary power supply line (50) connects the power storage circuit (40) and the smoothing circuits (48, 38) of the motor drive circuit (30) with each other, and includes a discharge electromagnetic relay (51). The discharge electromagnetic relay (51) turns on when the storage battery (11) is discharged. That is, the power stored in the storage battery (11) by the ON operation of the discharge electromagnetic relay (51) is compressed via the DC / DC converter (45), the secondary power supply line (50), and the inverter (35). Machine motor (M1).

Next, control means for controlling each device of the motor drive circuit (30) and the electric storage circuit (40) will be described.

The CPU (81) of the outdoor controller (80) is provided with an air conditioning controller (83).
(83) controls the air conditioning operation. That is, the air-conditioning controller (83) includes detection signals from various sensors (not shown) provided in various parts such as a refrigerant circuit for detecting an operation state, an operation signal from the remote controller (14), a stop signal, and a set temperature. Signal is input. And the air conditioning controller
(83) turns on / off the electromagnetic relay (32) based on the detection signal, the operation signal, the stop signal, and the set temperature signal, and outputs a drive control signal to the inverter drive circuit (82) to output the compressor control signal. It controls the number of rotations of the motor (M1), and further controls the opening degree of the expansion valve and the fans provided in the indoor and outdoor units to control the air conditioning operation.

On the other hand, the CPU (7) of the charge / discharge controller (70)
1) is the constant current control unit (27) and the charge / discharge end detection unit (29)
It also has a voltage command section and a converter control section (not shown), and switches on / off of each electromagnetic relay (42, 51) and a DC / DC converter based on an operation signal and a stop signal from a remote control (14). It controls the unit (45).

When discharging from the storage battery (11), the voltage command section outputs a voltage value corresponding to the drive of the compressor motor (M1).
For example, while outputting 300 V as a voltage command value, when charging the storage battery (11), a voltage command value corresponding to charging of the storage battery (11) is output.

The converter control section receives the detected current value of the current transformer (CT) and the voltage command value of the voltage command section (74), and based on the detected current value and the voltage command value, converts the converter drive circuit (72). ) To output a drive control signal. In particular, the converter control unit (75) is a DC / DC converter unit.
(45) a step-up operation of raising the voltage of the DC power output to a voltage corresponding to the driving of the compressor motor (M1); and a storage battery (11).
A drive control signal is output to converter drive circuit (72) so as to switch from a step-down operation of stepping down to a voltage corresponding to the charging of.

The converter drive circuit (72) receives a drive control signal from the converter control section (75), outputs a drive signal to the DC / DC converter section (45), and outputs the drive signal from the DC / DC converter section (45). So that the power voltage becomes the voltage command value
The switching element of the DC / DC converter (45) is on / off controlled.

-Configuration of Constant Current Control Circuit (25)-Next, a detailed configuration of the constant current control circuit (25) will be described with reference to FIG. Current detection circuit of constant current control circuit (25)
(26) is provided with an operational amplifier (101) as error output means for outputting a difference between the current of the storage battery (11) and the reference current. One of the input terminals of the operational amplifier (101) is connected to a DC current transformer (CT2), and the current detection signal from the DC current transformer (CT2) is input to the operational amplifier (101). . The other input terminal of the operational amplifier (101) is connected to an integration circuit (102) that outputs a reference voltage corresponding to a reference current value.

The operational amplifier (101) calculates a difference between a voltage corresponding to the current detection signal of the DC current transformer (CT2) and a predetermined reference voltage, amplifies the difference, and outputs an error signal.

The constant current control section (27) includes an A / D conversion section (10
3), control output unit (104), reference current storage unit (105) and PWM
An output unit (106) is provided, and is constituted by a microcomputer (27C).

The reference current storage unit (105) is a memory that stores a plurality of predetermined reference current values, and outputs a signal of the reference current value to the control output unit (104) and the PWM output unit (106).
The reference current storage unit (105) of the present embodiment is configured by a flash memory built in the microcomputer (27C).

The PWM output section (106) receives the signal of the reference current value, and then passes through the integration circuit (102) to the operational amplifier (10).
A PWM signal is output so that the voltage input to 1) becomes a predetermined reference voltage corresponding to the reference current value. Specifically, the PWM output unit (106) outputs a predetermined PWM signal by adjusting a PWM cycle and a duty ratio. P
The WM output unit (106) and the integration circuit (102) are connected to one PWM output port (110) provided in the microcomputer (27C).
Connected through.

The A / D converter (103) receives the error signal of the operational amplifier (101), converts this error signal into a digital signal, and outputs it to the control output unit (104).

The control output unit (104) receives the digital signal and the reference current signal from the reference current storage unit (105), and based on a comparison between them, determines the value of the charge current or discharge current of the storage battery (11). A control signal is output to the converter drive circuit (72) so that a predetermined reference current value is obtained.

-Operating operation- Next, the operating operation of the above-described power storage type air conditioner (10) will be described. First, the operation during the normal operation of performing the air-conditioning operation by receiving the commercial power from the commercial power supply (21) will be described. When an operation signal is input from the remote controller (14), the operation signal is transmitted to each controller (70, 80), and the air conditioning controller (83) turns on the electromagnetic relay (32) of the motor drive circuit (30). The charge / discharge controller (70) turns off both the charging electromagnetic relay (42) and the discharging electromagnetic relay (51). When the electromagnetic relay (32) is turned on, commercial power is input to the rectifier circuit (36) of the converter unit (34) and is converted to DC power, and is also smoothed by the smoothing circuit (38), and the DC power is converted to the inverter unit. Enter in (35).

The air conditioning controller (83) derives the required air conditioning load based on the detection values of various sensors provided in the refrigerant circuit and the like and the temperature set value from the remote controller (14), and derives the derived air conditioning load. The expansion valve opening and the fan speed are controlled so that the air conditioning capacity that satisfies the air conditioning load is exhibited. Further, the air conditioning controller (83) outputs a rotational speed command value of the compressor motor (M1) to the inverter drive circuit (82) as a drive control signal. Inverter drive circuit (82)
Receives the rotation speed command value from the air conditioning controller (83) and outputs a control signal to the inverter unit (35) so that the rotation speed of the compressor motor (M1) becomes the rotation speed command value. Then, the inverter unit (35) outputs predetermined AC control power by the switching element of the inverter unit (35) being turned on and off by the control signal, whereby
The rotation speed of the compressor motor (M1) is controlled to be the above rotation speed command value.

Next, the operation at the time of the discharging operation for performing the air conditioning operation by receiving the secondary power of the storage battery (11) will be described.

When an operation signal is input from the remote controller (14), the operation signal is transmitted to each of the controllers (70, 80), and the charge / discharge controller (70) operates to discharge the electromagnetic relay for discharging the secondary power line (50). Turn on (51). This electromagnetic relay for discharge (51)
As a result, the secondary power of the storage battery (11), which is DC power, is boosted by the DC / DC converter (45) and then input to the inverter (35) via the secondary power supply line (50). A voltage value corresponding to driving of the compressor motor (M1), for example, 300 V DC power is input to the inverter unit (35). The current value of the DC power input to the inverter (35) is controlled to a predetermined reference current value by constant current control described later. The reference current value is switched according to the load of the compressor motor (M1). The operation of the air conditioning controller (83)
This is the same as in the case of the normal operation.

The so-called peak cut operation is performed by switching between the normal operation and the discharge operation based on a preset schedule. The switching between the normal operation and the discharge operation may be forcibly performed by an instruction from the remote controller (14).

In the daytime, the normal operation or the discharge operation is performed. In the nighttime, a stop signal is generally input from the remote control (14), and the storage battery (11) is stopped in the state where the air conditioning operation is stopped. A charging operation is performed. That is,
The air conditioning controller (83) turns off the electromagnetic relay (32) of the motor drive circuit (30) and shuts off the supply of control power to the compressor motor (M1). On the other hand, the charge / discharge controller (70) turns on the charging electromagnetic relay (42) of the power storage circuit (40) and turns off the discharging electromagnetic relay (51) of the secondary power supply line (50).

At this time, the voltage command section of the charge / discharge controller (70) outputs a voltage command value corresponding to the charging of the storage battery (11), while the current transformer (70) is supplied to the converter control section of the charge / discharge controller (70). CT) and the voltage command value of the voltage command section are input. Then, the converter control unit outputs a drive control signal to the converter drive circuit (72) based on the detected current value and the voltage command value, and the converter drive circuit (72) outputs the DC / DC converter unit (45) The on / off control of the switching element is performed so that the voltage of the output power becomes the voltage command value, and the 200 V commercial power is reduced. After that, the reduced DC power is
The battery (11) is supplied to (11) to charge the storage battery (11). At this time, constant current control is performed, and a current having a predetermined reference current value flows through the storage battery (11).

-Constant Current Control- Next, the constant current control, which is a feature of the present embodiment, will be described with reference to FIG.

First, the reference current storage unit (105) selects a predetermined reference current value from the reference current table, and outputs a signal of the reference current value to the PWM output unit (106) and the control output unit (104). . The PWM output unit (1
06) is a PWM having a predetermined PWM cycle and a duty ratio such that the voltage input to the operational amplifier (101) through the integration circuit (102) becomes a predetermined reference voltage value corresponding to the reference current value. Output a signal. This PWM signal is an integrating circuit
By passing through (102), the signal becomes a DC voltage signal proportional to the duty ratio, and is input to the operational amplifier (101) as a reference voltage. The current detection signal from the DC current transformer (CT2) is also input to the operational amplifier (101). And
The operational amplifier (101) compares the current detection signal with the reference voltage, amplifies the difference, and outputs the amplified signal to the A / D converter (103) of the constant current controller (27). A / D converter
(103) converts the error signal into a digital signal, and outputs
Output to (104). The control output unit (104) compares the digitized error signal with the signal of the reference voltage value, and outputs a drive control signal to the converter drive circuit (72) based on the difference therebetween. That is, the control output unit (104) outputs the DC current through the converter drive circuit (72) so that the current detected by the DC current transformer (CT2) becomes the reference current value.
Controls the / DC converter section (45).

The above constant current control is executed in both the charging operation and the discharging operation of the storage battery (11). In the present embodiment, the constant current control is performed based on two types of reference current values during the charging operation, and the constant current control is performed based on the three types of reference current values during the discharging operation. As described above, the switching setting of the reference current value is performed by the reference current storage unit (105) of the constant current control unit (27).

According to the power storage type air conditioner (10), the PWM output unit (106) built in the microcomputer (27C) is used to
Since the reference voltage is generated by integrating the PWM signal of the WM output unit (106) by the integration circuit (102), the circuit configuration can be simplified.

The PW of the microcomputer (27C)
Since the reference current value signal for current control is output through the M output port (110), the reference voltage of the operational amplifier (101) can be generated by only one output port. That is, there is no need to provide a plurality of output ports, and it is not necessary to switch the output ports. Therefore, the circuit configuration can be further simplified.

Since the reference current value is stored in the reference current storage section (105) composed of a flash memory,
It becomes easy to set a plurality of reference current values. Also,
Since the reference current value can be set by a program of the microcomputer (27C), it can be easily changed. Therefore, delicate system tuning can be performed at the installation site without changing the hardware.

Modification of Embodiment In the above embodiment, the constant current control unit (27) for storing the reference current value in advance is provided. It is needless to say that a control unit for storing a reference voltage value corresponding to the above may be provided. That is, a reference voltage table is created in advance, and based on the reference voltage table, the PWM output unit (106) sends the P
A WM signal may be output. Even in this case, the same effect as the above embodiment can be obtained.

In the above embodiment, the storage battery (1
While charging 1), the storage battery (11)
The air-conditioning operation is performed only by receiving the secondary power from the so-called peak cut operation, but in addition to this,
While the storage battery (11) is charged at night, during a predetermined time period during the daytime, the air conditioner is operated by receiving both the commercial power of the commercial power supply (21) and the secondary power from the storage battery (11). The shift operation may be performed.

[0070]

As described above, according to the first aspect, P
Since the reference voltage is generated based on the PWM signal of the WM output means, the circuit configuration of the constant current control circuit can be simplified.

According to the second aspect, the reference current value is stored in the reference current storage means of the programmable microcomputer, so that a plurality of reference current values can be easily set. Further, the reference current value can be easily changed. Therefore, without any hardware changes,
It is possible to perform fine system tuning.
Further, since the output port for communicating the PWM output means and the reference voltage generation means is constituted by one PWM output port, the circuit configuration can be further simplified.

According to the third aspect of the present invention, P
Since the reference voltage is generated by integrating the WM signal, the reference voltage can be generated with a simple configuration.

According to the fourth aspect, an error output means can be obtained with a specific configuration.

According to the fifth aspect, the reference current storage means can be obtained with a specific configuration.

[Brief description of the drawings]

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

FIG. 2 is an overall configuration diagram of a power storage type air conditioner.

FIG. 3 is an electric circuit diagram of a power storage type air conditioner.

FIG. 4 is a circuit diagram of a constant current control circuit.

FIG. 5 is a circuit diagram of a conventional constant current control circuit.

[Explanation of symbols]

 (25) Constant current control circuit (26) Current detection circuit (27) Constant current control unit (27C) Microcomputer (101) Operational amplifier (102) Integrator circuit (103) A / D converter (104) Control output unit ( 105) Reference current storage unit (106) PWM output unit (CT2) DC current transformer

Claims (5)

[Claims] 1. A power storage air conditioner comprising a constant current control circuit (25) for controlling a charging current and a discharging current of a power storage means (11), wherein the constant current control circuit (25) A stored reference current storage means (105); a PWM output means (106) for receiving a reference current signal from the reference current storage means (105) and outputting a PWM signal corresponding to the reference current value; Receiving an error signal indicating the difference between the current value of the power storage means (11) and the power control means (45) for adjusting the current of the power storage means (11) so as to eliminate the difference. Control output means (104) for outputting, and current detection means (CT2) for detecting the current of the power storage means (11).
A reference voltage generation means (102) for outputting a reference voltage based on the output of the PWM output means (106); a current detection signal from the current detection means (CT2); and a reference voltage generation means (102). Receiving the reference voltage and the control output means (10
4) An energy storage type air conditioner characterized by comprising an error output means (101) for outputting an error signal. 2. The storage type air conditioner according to claim 1, wherein the reference current storage means (105), the PWM output means (106) and the control output means (104) are provided in a microcomputer (27C), An output port of the microcomputer (27C) for communicating the PWM output means (106) and the reference voltage generation means (102)
A power storage type air conditioner comprising one PWM output port (110). 3. The storage type air conditioner according to claim 2, wherein the reference voltage generating means is constituted by an integrating circuit (102) for integrating an output of the PWM output means (106) and outputting a reference voltage. A power storage type air conditioner, comprising: 4. The storage type air conditioner according to claim 2, wherein the error output means comprises an operational amplifier (101), and the operational amplifier (101) and the control output means (104). ) Is a power storage type air conditioner characterized by being connected via an A / D converter (103) provided in a microcomputer (27C). 5. The storage type air conditioner according to claim 2, wherein the reference current storage means (105).
Is a power storage type air conditioner characterized by comprising a flash memory.