JPS60240942A - Controller of air conditioner - Google Patents

Abstract

PURPOSE:To improve comfortability by making a range of an air quantity identical even if power source frequency differs, by varying a current-interupting phase angle of an indoor blower according to the frequency. CONSTITUTION:The number of revolutions of an indoor blower 6 is made identical by varying an interrupting phase angle even with commercial power sources whose frequencies (50Hz and 60Hz) are different from each other. In other words, on account of a matter that when a resisting value of a resistor 36 (50Hz) is made larger than that of a resistor 37 (60Hz) in a phase control circuit 20, though charging time for the 50Hz becomes longer than that for the 60Hz and build-up time of a wave form V (+) of voltage to be applied to a plus input terminal of a comparator 31 becomes long, as a wavelength for the 50Hz of a current wave form of a blower 6 in its branch chamber becomes long also, an identical quantity of an electric current can be supplied to the indoor blower 6 even if generating time of a trigger signal lags and an air quantiy can be made to fall within a constant air quantity range even if the frequencies differ from each other.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a control device for an air conditioner having a heat medium compression cycle.

<Prior art> Conventionally, a compressor that discharges a heat medium, an outdoor heat exchanger connected to the compressor via a flow path switching valve, and a negative side connected to the outdoor heat exchanger and the other side connected to the outdoor heat exchanger and the other side connected to the outdoor heat exchanger through a flow path switching valve have been used. A heat medium compression cycle is constituted by an indoor heat exchanger connected to the compressor via a valve, and includes an indoor blower for forcibly blowing air to the indoor heat exchanger, and by switching a flow path switching valve. In air conditioners capable of heating, cooling, and defrosting, a single-phase induction motor is used as the motor for the indoor blower, and the number of revolutions varies depending on the frequency. Therefore, when a motor with the characteristics shown in Figure 5 is used with the load curve shown in the figure, for example, if the power supply frequency is 6 (') H2, the rotation speed and energy consumption efficiency will decrease at 50 Hz and 1 at high power. (EER also) decreases, and conversely, the rotation speed increases too much in Ill. In order to prevent this rotation speed from increasing too much, if you lower the frequency by 5('3Hz), it will reduce to 6(
If the lHz drops too much, problems such as frost formation may occur during cooling. As a result, the air gets too cold when cooling, or feels cold when heating because the air volume is too high. That is, the frequency is 5('
) Hz and 61') I-1z, the difference in air volume used caused discomfort and decreased EER.

In view of the above, the present invention makes it possible to maintain the same air volume range even if the power supply frequency is different by changing the current cut-off phase angle of the indoor blower in accordance with the frequency, thereby improving comfort. The present invention aims to provide a control device for an air conditioner.

<Embodiment> An embodiment of the present invention will be described below with reference to the drawings. This includes a compressor 1 that discharges a heat medium, and an outdoor unit connected to the compressor 1 via a flow path switching valve 2. A heat medium compression cycle 5 is connected to the heat exchanger 3 and the indoor heat exchanger 1 whose negative side is connected to the outdoor heat exchanger 3 and whose other side is connected to the compressor 1 through the flow path switching valve 2. In the air conditioner, which has an indoor air blower (forcibly blowing air to the indoor heat exchanger 4), which has a heating-cooling-defrosting operation power by switching the flow path switching valve 2. , a control circuit 8 for controlling the rotation speed of the indoor blower 6 is provided, and the control circuit 8 corrects the rotation speed error by changing the phase angle of current cutoff to the indoor blower 6 in accordance with the difference in power frequency. It is designed to eliminate it.

1 and 2 are circuit diagrams of a control device according to the present invention, in which 9 is a power supply, 10 is an indoor blower, 1]ai2a+13a,
are respectively compression 1!1, flow path switching valve 2, outdoor blower 1 (l
This is a relay contact that turns ON.

Also, 15 in Figure 2 indicates indoor ventilation I! Set the air volume of 6 to "strong"
This is an air volume switch for switching between "weak" and "fine", and the output signal of this switch is input to the control circuit 8. In addition, 1 (5) in FIG. 3 is a pressure reducer.

Then, the control circuit 8 operates the indoor blower 6 by the manual signal from the air volume switch 15.
A main control circuit 1′: ] outputs a signal that indicates ”; a phase control circuit 20 that outputs a trigger signal based on a signal from the main control circuit 19; It is composed of a t-liack circuit 2 which controls the number of revolutions.

3- Note that X and Y in FIG. 1 are electrically connected to X and Y in FIG. 2, respectively, 22 is a transformer, and 23 is a bridge type rectifier circuit (including smoothing). The main control circuit] 9 is a general one-chip microcomputer, and internally includes a program RO 4, a data RAM, and an ALU.
and input ports IN1~3, output ports 0LJTI~
8 and is driven by an external oscillation circuit 24. Then, select 1 from the air volume selector switch 15, ``High'', ``Weak'', ``Slight''.
The signals are input to IN1 to IN3 of the main control circuit 19. 2
5 is a driver'-array, and output ports OUT1~
3, relay coils 11, 12.1
Drive 3.

In addition, from the main control circuit 19 to the phase control circuit 2 (1),
The air volume signal "strong" of the indoor fan 6 is output from output capo OUT 4, and the air volume signal 1 is output from output capo OUT 5.
0 [1T 6 outputs an air volume signal "weak" and the output capo hou'r7. G outputs signals corresponding to power supply frequencies of 50 Hz and 6 (l Hz), respectively.

4- On the other hand, the phase control circuit 20 receives the current signal of the indoor blower 6 from the triac circuit 21, and after passing the phase corresponding to the air volume signal from the main control circuit 19, turns on the F LIDEC 21A of the triac circuit 21. The bird that outputs one signal. That is, the phase control circuit 20
A comparator 31 is provided, and a negative input terminal of the comparator 31 is connected to a resistor 32 and an output port OUT of the main control circuit 19.
4. .

Resistors 30, 33°3 with different resistance values connected to 5.6
4 are connected in parallel, and a voltage divided by the parallel resistance and the resistor 35 is applied. Further, the positive input terminal of the comparator 31 is connected to the output port O[I T
Resistor 36 (at 50Hz) and resistor 37 connected to 7 and 8
(6 (nlz), resistance 38, 41.44, capacitor 4
0, phototransistor 42A of first photocoupler 42,
') Transistor 43 is connected, and capacitor 4 is connected through resistor 36 (at 50Hz) or resistor 37 (at 6rlHz).
A voltage charged to 0 is applied. Note that when the resistance 36 has a larger threshold value than the resistance 37, that is, 50 Hz, the charging time becomes longer.

Then, the voltage is applied to the triac circuit 21 as shown in FIG.
When the indoor blower 6 is energized by the signal from
3 is supplied with base current through resistor 38C) N
L, capacitor, q, t:+ are discharging through resistor 4.1. Therefore, at this time, the plus input terminal of the comparator 31 becomes a low level voltage. Then, the current of the indoor fan 6 becomes zero, and the triac 2 of the triac circuit 21
When 11\ is turned off, the light emitted from the light emitting diode 42B of the triac circuit 21 causes the transistor 42 to
A turns on, and the transistor 43 becomes (-) FF.
), the capacitor 40 starts charging. Therefore, comparator 3
When the voltage at the positive input terminal of No. 1 becomes higher and the input voltage becomes higher than that at the negative input terminal, the output of the comparator 31 becomes I
- the base current flows through the transistor 43) through the resistor 45 and diode 46. For this purpose, the transistor 4) is turned on, and the second photocoupler 5f'
1 light emitting diode 50 is made to emit light, the triac 50 outputs one signal as shown in FIG. In addition, 45.4.7.49
is resistance.

The triac circuit 21 turns on the triac 21A in response to a trigger signal from the phase control circuit 2 (), turns on the indoor blower 6, and sends a current cutoff signal for the indoor blower 6 to the first output of the phase control circuit 20 as shown in FIG. It outputs to the phototransistor 42A of the photocoupler 42. That is, in the triac circuit 21, the phototriac 50B of the second photocoupler 50 is connected to the gate of the triac 21A.
When it lights up, the internal triac turns on, and the resistor 51 is connected to TRIAC 2, and the phototriac 5 is connected to A.
(The gate current flows through lB and turns on.

In the figure, 51 is a resistor, and 53 is a capacitor. Also, when the triax 21A is OFF, the voltage of the AC power supply 9 is the same as that of the indoor blower 6, the resistor 52, and the diode bridge 54.
Through the light emitting diode 42B of the first photocoupler 42
=7- to emit light and output an indoor ventilation (current cutoff signal) to the phase control circuit 2().

In the configuration described in 11- above, during cooling/heating operation, the signals from the air volume selector switch] 5 to 1 high, 1 low, and 1 are sent to the main control circuit 1.
5], the output port OLI is output accordingly.
Air volume signal force is applied from T4, 5, and 6. In addition, the power frequency (50Hz or 6
0Hz).

In the phase control circuit 20, as described above, the comparator 3
The positive input terminal of 1 has a frequency (5 ('lHz or 6
A voltage with a constant waveform corresponding to the frequency (tiHz) is applied. Then, depending on the air volume signal from the main control circuit 19, voltages of different levels are applied to the negative input terminal depending on the resistance value of the resistor 3 (1, 33, or 34).Therefore, the output of the comparator 31 The timing at which the light becomes H level varies depending on the airflow signal, and the light emitting diode of the second photocoupler 50
The output timing of the trigger signal 1' 50 A #- etc. also differs depending on the air volume signal. That is, the indoor air blower 8-iso current is controlled by the timing control of one signal inputted to the triac circuit 21, and for example, if the trigger signal is inputted to the triac 50B at a hard point, a large amount of current flows,
The indoor fan 6 can be rotated on "strong", and the fourth
If the trigger signal is input at a late time as shown in the figure, the current will be small and the indoor blower 6 will rotate at 1-1 or "slight".

In addition, Fig. 5 is a diagram showing the relationship between the torque and rotation speed of the electric motor of the indoor blower 6. If the motor is used according to the load curve in the figure and the phase is controlled as shown in the figure, it will be possible to obtain a light breeze at 60H2. In order to prevent the rotational speed from dropping too low, it is also possible to keep the speed switching tap of the motor as it is now.

Moreover, FIG. 6 is a diagram showing the relationship between the rotation speed and the cut-off phase angle of the indoor fan 6, and by changing the cut-off phase angle, it can be The rotational speed of the indoor blower 6 can also be made the same. That is, in the phase control circuit 20, as in the above embodiment,
The resistance value of resistor 36 (5 (iHz)) is changed to the resistance value of resistor 37 (6 (1H)
z), the charging time will be longer at 50 Hz, and the voltage waveform ＼・“(+) applied to the positive input terminal of the comparator 31 will be larger than that shown in FIG. Standing
The current waveform of the indoor fan 6 shown in the first row of Figure 4 also has a longer wavelength at 50Hz, so even if the bird generates one signal later, the same amount of current can be generated. By supplying the air to the indoor blower 6, it is possible to maintain a constant air volume range even if the frequency is different. .

<Effects> As is clear from the explanation below, the present invention includes a compressor that discharges a heat medium, an outdoor heat exchanger connected to the compressor via a flow path switching valve, and a A heat medium compression cycle is constituted by an indoor heat exchanger connected to the exchanger and connected to the compressor via a flow path switching valve on the other side, and an indoor heat exchanger for forcibly blowing air to the indoor heat exchanger. In an air conditioner having a blower and capable of performing heating/cooling/defrosting operation by switching a flow path switching valve, a control circuit for controlling the rotational speed of the indoor air blower is provided, and the control circuit is configured to eliminate the rotational speed error by changing the current cutoff phase angle to the indoor blower in response to the difference in power supply frequency.

Therefore, according to the present invention, the current cutoff phase angle of the indoor blower can be changed in accordance with the frequency, and the air volume width can be made the same even if the power supply frequency is different, thereby providing an excellent effect of improving comfort.

[Brief explanation of the drawing]

Fig. 1 is a control circuit diagram showing an embodiment of the present invention, Fig. 2 is a circuit diagram showing a main control circuit and a phase control circuit of the control circuit, Fig. 3 is a configuration diagram of the air conditioner, and Fig. 4 Figure 5 is a diagram showing the main waveforms of each part of the triac circuit and phase control circuit, Figure 5 is a diagram showing the relationship between the rotation speed and torque of the indoor fan, and Figure 6 is a diagram showing the rotation speed and cutoff phase angle characteristics of the indoor fan. be. 1: Compressor, 2: Flow path switching valve, 3: Outdoor heat exchanger, 4:
Indoor heat exchanger, 5: Heat medium compression cycle, 6: Indoor blower, 7: Heating load detection device, 8: Control circuit, 15; Air volume selection switch, 19: Main control circuit, 21): Phase control circuit, 21: triac circuit. Application filed Sharp Corporation Agent Tsunehisa Nakamura Figure 6, JI

Claims (1)

[Claims] A compressor that discharges a heat medium, an outdoor heat exchanger connected to the compressor via a flow path switching valve, and a − side connected to the outdoor heat exchanger and the other side connected to the compressor A heat medium compression cycle is constructed from an indoor heat exchanger connected to the indoor heat exchanger, and has an indoor air blower mode to forcefully blow air to the indoor heat exchanger, and can switch between heating and cooling by switching the flow path switching valve. In the air conditioner capable of frost operation, a control circuit is provided for controlling the rotation speed of the indoor blower, and the control circuit is configured to change a current cutoff phase angle to the indoor blower in response to a difference in power supply frequency. A control device for an air conditioner, characterized in that it is configured to eliminate the rotation speed error.