JPS6338622B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for an air conditioner having a dehumidifying function, and particularly to a control device that can save power during dehumidifying operation.

Conventional control devices and their problems are shown in Figures 1 and 2.
This will be explained using figures. Figure 1 shows the control circuit, 1
2 is a commercial AC power supply, 2 is a main operation switch, and 3 is an outdoor blower motor. Reference numeral 4 denotes a mode changeover switch that when turned on the upper side of the paper provides cooling operation, and when turned on the lower side of the paper, dehumidification operation is performed. 5 is a changeover switch that is automatically switched by the thermostat. When the indoor temperature rises above the set value, it is connected to the upper side for cooling operation, and when the indoor temperature falls below the set value, it is connected to the lower side for dehumidification operation. become. 6 is a reactor, 7 is a changeover switch that functions to change the speed of the indoor blower, 8 is a dry valve coil, 9 is a motor for the indoor blower, and 10 is a motor for the compressor. FIG. 2 is a diagram showing temporal changes in indoor temperature and humidity during dehumidification operation using a conventional device, where the horizontal axis represents time from startup, curve 11 represents indoor temperature (unit: °C), and curve 12 represents time. Represents relative humidity (unit: %).

In a conventional air conditioner having the circuit configuration as described above, operation is carried out by turning on the mode changeover switch 4 to the lower side in FIG. When the indoor temperature rises above the set temperature T ₁ (see Figure 2), the changeover switch 5, which is automatically switched by the thermostat during dehumidification operation, connects to the upper side and enters cooling operation, setting the indoor temperature to the set temperature. When the temperature drops below the hysteresis width of temperature _T1 , the changeover switch 5 is connected to the lower side and dehumidification operation is started. That is, during dehumidification operation, the compressor motor 10 is always in a energized state. As a result, the indoor temperature during dehumidification operation is reduced to curve 1 in Figure 2.
1, the temperature is controlled within a certain range. on the other hand,
The humidity during dehumidification operation follows a temporal change as shown by curve 12. In this way, the indoor temperature can be freely adjusted by the user by variably setting the set temperature _T1 on the thermostat. However, the indoor temperature is determined only by the dehumidifying capacity of the air conditioner, and the user cannot freely set the indoor humidity.
The dehumidifying capacity of air conditioners used in ordinary homes is usually around 2/Hr. Furthermore, the room in which the air conditioner is operated is usually kept closed. As a result, the indoor humidity
As shown by curve 12 in the figure, the dehumidifying capacity of the air conditioner and the humidity of the room become approximately constant at time t ₁ when they are in equilibrium. After this time _t1 , the dehumidifying capacity of the air conditioner is used only to keep the humidity in the room constant. In other words, the dehumidifying capacity during the dehumidifying operation is required from the start of the dehumidifying operation until time _t1 , and the dehumidifying capacity is not so required after time _t1 . However, when using the conventional control circuit shown in FIG. 1, the compressor motor 10 is always energized even after time _t1 , and therefore electric power is wasted. In order to use electricity effectively, it is possible to install a humidity sensor and use the detected signal to control the compressor motor, but it is not possible to install a humidity sensor in a general home air conditioner. Currently, it is difficult to maintain the humidity sensor due to its lifespan and maintenance.

An object of the present invention is to solve the above-mentioned drawbacks by simply adding a simple timer circuit to an air conditioner control device that can quickly dehumidify indoor air and reduce power consumption during dehumidification operation. Our goal is to provide the following.

In the present invention, a timer circuit is provided that outputs a repeating ON/OFF signal, and the output signal of this timer circuit is used to operate and stop the compressor motor, thereby reducing power consumption while maintaining the dehumidifying function. do.

The present invention will be explained below with reference to the drawings.

FIG. 3 is a circuit diagram showing one embodiment of the control device of the present invention, and FIGS. 4a and 4b are diagrams showing changes in indoor humidity and waveform diagrams of signals from the control device according to the present invention. In FIG. 3, 15 is a power supply circuit, 16 is a timer circuit, 17 is a switch, 18 is a relay drive circuit, and 19 is used to turn on (operate) and turn off the compressor motor 10 driven by this relay drive circuit 18. This is a switch for (stop) control, and the other symbols are the same as in FIG. The timer circuit 16 repeatedly outputs an on signal and an off signal, as shown by reference numeral 20 in FIG.
7 is adapted to generate an output signal when it is switched from contact 17a to contact 17b. Now, in FIG. 3, when the main operation switch 2 is turned on, the changeover switch 4 is set to the dehumidifying operation mode, and the switch 17 is connected to the contact 17b, the timer circuit 16 operates and outputs the output signal shown in FIG. 4b. Generates 20. The output 20 of the timer circuit 16 controls the compressor motor 10 on and off via the relay drive circuit 18 and switch 19, and as a result, the indoor humidity changes as shown by the curve 22 in FIG. 4a. . In other words, from the start of dehumidification operation until time t ₁ , the ON signal is continuously turned on, and from time t ₁
From time t ₁ to time t ₂ and from time t ₃ to time
The compressor motor is controlled by a signal ₂₀ that is a constant repetition of being off from time t ₅ to time t ₆ until time t 4, and on from time t ₂ to time t ₃ and from time t ₄ to time t ₅ . be. By using such a control method, the indoor humidity changes as shown in curve 22,
The indoor humidity reaches equilibrium faster. Third
In the control circuit of the present invention shown in the figure, the timer circuit 16
Since the dehumidifying operation is performed only when the output level of is high, the indoor humidity changes stepwise as shown by curve 22.

By performing the dehumidifying operation intermittently according to the output signal of the timer circuit 16 in this way, the indoor humidity becomes almost constant around time _t1 , and after that, by intermittent operation, a power-saving dehumidifying operation can be achieved. .

As described above, according to the present invention, it is possible to realize power saving during dehumidifying operation while sufficiently satisfying the dehumidifying function with a simple configuration of simply adding a timer circuit to the conventional device.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a conventional control device, Fig. 2 is a diagram showing changes in indoor temperature and humidity controlled by the conventional circuit, and Fig. 3 is a circuit diagram showing an embodiment of the control device of the present invention. 4a is a diagram showing changes in indoor humidity controlled by the control device according to the present invention,
FIG. 4b is a waveform diagram showing the timer circuit output signal. Explanation of symbols, 10... Compressor motor, 16...
...Timer circuit, 19...Switch, 20...Timer circuit output signal, 22...Indoor humidity change curve.

Claims (1)

[Claims] 1 A control device for an air conditioner, in which a switch is connected to the compressor motor used in the air conditioner to turn on and off the current flowing to the compressor motor. A switch control means for generating an output signal to turn the air conditioner on or off is connected, and the switch control means has a first switch that continuously turns the switch on immediately after the air conditioner is put into operation.
After the supply of the first output signal is completed, the switch is supplied with a second output signal that alternately turns the switch into an OFF state and an ON state at a predetermined period. A control device for an air conditioner, characterized in that the air conditioner is supplied with.