JPS5856064B2 - air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air conditioner such as a room cooler, and more particularly to temperature display of an air conditioner room temperature and a set temperature.

A conventional device of this type is shown in FIG.

In the figure, 1 is the commercial power supply, 2 is the power switch,
3 is the blower motor of the heat exchanger inside the air conditioning room, 4 is the temperature control relay, 5 is the compressor motor, 6 is the blower motor of the outside heat exchanger of the air conditioning room, 7 is the power transformer, 8 is the diode bridge, 9 is the smooth Capacitor, 10 and 16 are resistors, 1
1 is a thermistor that detects the temperature inside the air conditioned room, 12 and 1
8 is an amplifier, 13 and 19 are A/D converters, 14 and 20 are current limiting resistors, 15 is a group of n room temperature display light emitting diodes, 17 is a set temperature variable resistor, 2F is m set temperature display lights. Diode group, 22 is a comparator,
23 is an excitation coil of the temperature control relay 14, and 24 is a flywheel diode.

Next, the operation will be explained.

When the power switch 2 is turned on, voltage is applied to the blower motor 3 and power transformer 7 of the heat exchanger inside the air conditioned room.
A diode bridge 8 connected to the secondary side of the power transformer 7 constitutes a DC power supply together with a smoothing capacitor 9.

Furthermore, the temperature inside the air conditioned room is converted into voltage by a thermistor 11 that detects the temperature inside the air conditioned room and a resistor 10 connected in series with the thermistor 11, and the voltage is amplified by an amplifier 12 and then inputted to an A/D converter 13. Ru.

Then, in accordance with the input voltage level of the A/D converter 13, one of the n room temperature display light emitting diode groups 15 connected to the output terminal is turned on.

This operation can be similarly applied to the lighting of the set temperature display light emitting diode group 21, and the voltage set by the set temperature variable resistor 7 is input to the A/D converter 19 via the amplifier 18, and m set temperature One of the display light emitting diode group 21 is turned on.

Here, the comparator 22 compares the voltage converted by the thermistor 11 corresponding to the temperature inside the air-conditioned room with the set voltage of the set temperature variable resistor 17, and adjusts the temperature control relay 4 so that the temperature inside the air-conditioned room becomes the set temperature. Since the contacts of the compressor motor 5 and the blower motor 6 of the outside heat exchanger of the air conditioned room are opened and closed,
can be stopped and started to control the temperature inside the air conditioned room.

Furthermore, when the power switch 2 is turned on, one of the room temperature display light emitting diode group 15 and one of the set temperature display light emitting diode group 21 light up, so power supply can be confirmed.
Moreover, when power is being supplied to the compressor motor 5 and the blower motor 6 of the heat exchanger outside the air-conditioned room, the air-conditioned room temperature is displayed higher than the set temperature, so the operation can be confirmed.

Since the conventional air conditioner room temperature display device and set temperature display device are configured as described above, the air conditioner room temperature display circuit,
Two identical set temperature display circuits, two air conditioner indoor temperature indicators, and two set temperature indicators are required, and for air conditioner users, it may seem strange to have two similar displays lined up. It had the disadvantage of being difficult to shift.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and by providing a so-called analog switch consisting of a field effect transistor etc. and an astable multi-byte break whose output pulse duty is not 50%, the display device can be improved. An object of the present invention is to provide an air conditioner equipped with a display that flashes both the air conditioner room temperature and the set temperature.

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

In FIG. 2, 25 and 26 are both so-called analog switches such as field effect transistors, and 27 is an astable multivibrator.

The source terminal of the analog switch 25 is connected to the source terminal of the analog switch 26 and then to the input terminal of the amplifier 12, and the drain terminal of the analog switch 25 is connected to the connection point between the resistor 10 and the thermistor 11 that detects the temperature in the air conditioned room. , and the drain terminal of the analog switch 26 is connected to the connection point between the resistor 16 and the variable resistor 17 for setting temperature.

One of the non-inverting output terminal and the inverting output terminal of the astable multivibrator 27 connected to the DC power supply is connected to the gate terminal of the analog switch 25, and the other is connected to the gate terminal of the analog switch 26.

When the power switch 2 is turned on in this type of system, the analog switches 25 and 26 alternately detect the temperature in the air-conditioned room according to the period of the oscillation frequency of the astable multivibrator 27, and set the potential and set temperature of the thermistor 11. The set potential of the variable resistor 17 is transmitted to the amplifier 12, and the amplifier 12 amplifies this input voltage and converts it to the A/D converter 1.
Tell 3.

This A/D converter 13 lights up one of the light emitting diode groups 15 according to its input voltage level, and the input voltage is the potential of the thermistor 11 that detects the temperature in the air-conditioned room and the variable resistor for the set temperature. Since the amplified voltages corresponding to the set potentials 17 are alternately repeated, the display of the light emitting diode group 15 also blinks alternately at two points accordingly.

Here, since the output pulse of the astable multivibrator does not have a duty of 50%, it is possible to manually determine whether the currently displayed temperature is the air conditioner room temperature or the set temperature by checking the length of the lighting time of the light emitting diode.

For example, if the output pulse of the astable multi-by-break is set to a duty of 67% and an oscillation frequency of 1/3 Hz, the temperature in the air-conditioned room can be displayed alternately for 2 seconds and the set temperature for 1 second, making it easy to distinguish.

Needless to say, if the temperature inside the air conditioned room and the set temperature are equal, one light will be lit continuously.

As described above, according to the present invention, by providing an analog switch and an astable multivibrator whose output pulse duty is not 50%, it is possible to display both the air conditioner room temperature and the set temperature on the display by blinking alternately. They have the advantage of being easily distinguishable because they have different lengths of time.

Another advantage is that the conventional system requires two air conditioner room temperature display circuits, two set temperature display circuits, two air conditioner room temperature indicators, and two set temperature display circuits, but can be reduced to one display circuit and one display.

In FIG. 2, it goes without saying that the output pulse duty of the astable multivibrator may be 50% if the length of time for displaying the temperature in the air-conditioned room and the time for displaying the set temperature may be the same.

Furthermore, in relation to the embodiment shown in Fig. 2, the display is not limited to the one shown here, but may also be of any other configuration, such as a numeric display or a level meter, etc., and that analog switches may also be used. It goes without saying that a relay or other structure having the same function as this may be used, and the astable multivibrator may also be a counter circuit or other structure having the same function.

Furthermore, it is clear that the technology of the present invention can be applied to air-conditioning heat source equipment, not only those using a combination of a compressor and a heat exchanger, but also those using oil, gas, etc. as a heat source.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram of a conventional embodiment, and FIG. 2 is a circuit diagram of an embodiment of the present invention. In the figure, 10 and 16 are resistors, 11 is a thermistor that detects the temperature in the air conditioned room, 12 is an amplifier, 13 is an A/D converter, 14 is a current limiting resistor, 15 is a group of light emitting diodes, 1
7 is a variable resistor for setting temperature, 22 is a comparator, 23
24 is a flywheel diode, 25° and 26 are analog switches, and 27 is an astable multivibrator. In the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1 An element that detects the temperature in the air-conditioned room, a setting element that sets the temperature in the air-conditioned room, separate analog switches that take out each potential of the temperature detection element and the temperature setting element, and the gates of these analog switches have inverted and non-inverted outputs. An astable multivibrator with a duplication of less than 50% that is connected to one of the terminals and alternately switches the above analog switch with inverted and non-inverted outputs, a common display means for displaying the temperature in the air conditioned room and the set temperature, and each of the above analog switching drive circuit means that is operated based on the respective potentials taken out alternately and causes the display element of the display means to blink the indoor temperature and the set temperature at different cycles in accordance with the inversion and non-inversion output cycles of the astable multi-by-break; Air conditioner consisting of.