JPS6326878B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital display device for air conditioners and the like, and particularly to a digital display device that can display time and temperature using one digital display.

2. Description of the Related Art Conventionally, a digital display device for displaying time and temperature using a single digital display in air conditioning equipment has been constructed as shown in FIG.

That is, a counter 1 that counts the commercial power frequency, a second counter 2 that counts seconds based on the counted value of the commercial power frequency by this counter 1, a minute counter 3 that counts minutes based on the counted value of this second counter 2, A clock section is constituted by a time counter 4 that counts time based on the counted value of the minute counter 3, and a time display register 5 that temporarily stores and holds the counted values of the minute counter 3 and the hour counter 4. A temperature detector 6 consisting of a temperature detecting thermistor Th and a resistor R, an A/D converter 7 that converts the change in terminal voltage of the temperature detecting thermistor Th of the temperature detector 6 into a digital value, and a temperature detecting device consisting of a variable resistor VR. An adjustment volume 8, an A/D converter 9 for converting the voltage obtained from the temperature setting device 8 into a digital value, and a temperature display register for temporarily storing and holding the digital values obtained from the A/D converters 7 and 9. 10 constitutes a temperature display section, and the signal in the time display register 5 or the temperature display register 10
By selecting the signal at the display changeover switch 11 and inputting it to a digital display 12 such as a liquid crystal or LED for displaying the time, the single digital display 12 displays the time and temperature.

In the conventional example described above, normally only one of the time display and the temperature display is displayed, and when it is desired to display the other, the display is switched by operating a display changeover switch.

On the other hand, recently there has been a demand for automatic display of time and temperature display alternately at regular intervals. This conventional example is shown in FIG. In FIG. 2, the same parts as in FIG. 1 are given the same numbers. Reference numeral 13 denotes a display switch that switches between a time display and a temperature display in synchronization with the output signal of the minute counter 3.

Now, when changing the set temperature by moving the temperature control volume in these conventional examples, in the conventional example shown in FIG. In this example, in order to know the set temperature while the time is being displayed, it is necessary to wait for a while until the display switches to the temperature display. Alternatively, even if the temperature is displayed, the display may switch to the clock display while operating the temperature adjustment volume.

The present invention is intended to solve these problems and provide a digital display device that can perform practical display switching. Equipped with a timer and a means for detecting changes in the digital value (digital value), it detects that the temperature setting value has changed when the adjustment volume is moved, and then switches the display so that the temperature is displayed preferentially for a certain period of time. It is an attempt to control the device.

An embodiment of the present invention will be described below with reference to FIG. In FIG. 3, the same parts as in FIGS. 1 and 2 are given the same numbers. Further, the output signal of the minute counter 3 is input to the display switching device 13, and the time display and temperature display are alternately switched based on this signal, as in the conventional example shown in FIG.

Now, suppose you move the temperature control knob to raise or lower the set temperature. At this moment, the output voltage of temperature control volume 8 changes,
The output (digital value) of the A/D converter 9 which receives this voltage as input also changes. This change is detected by change detection circuit 14 and resets timer 15. After this, the timer is 15 for a certain period of time.
Based on the output, the display switching circuit 13 gives priority to the temperature display. Therefore, even if the clock is displayed until just before you move the temperature control knob, it will switch to the temperature display as soon as you move it, and you can set the desired temperature by moving the temperature control knob while checking the set temperature or detected temperature (room temperature). Can be set to .

In this embodiment, the change detection circuit 14 is also used as a hysteresis circuit for eliminating fluctuations in the output voltage of the temperature control volume, so there is no need to newly provide it. These circuits and timers can also be configured using a program on a microcomputer, and in this case, this function can be realized without any particular cost.

As is clear from the above description, the digital display device according to the present invention switches between time display and temperature display using a single 4-digit digital display, and even when the time is being displayed, the temperature can be adjusted. This is an inexpensive and effective multi-display device that allows you to easily adjust the temperature by switching to the temperature display preferentially when you move the knob, displaying the room temperature in two digits and the set temperature in the remaining two digits. .

[Brief explanation of the drawing]

1 and 2 are block circuit diagrams showing a conventional display switchable digital display device;
The figure is a block circuit diagram showing a digital display device capable of display switching according to an embodiment of the present invention. 8... Temperature control volume, 9... A/D converter, 12... Digital display, 13... Display switching circuit, 14... Change detection circuit, 15... Timer.

Claims (1)

[Claims] 1. A display switch that automatically switches between time and temperature display on one digital display, and a temperature setting value obtained by A/D converting the voltage that changes depending on the temperature control volume. and a timer, and when the temperature setting value changes, the timer is reset and at the same time the display switch is switched to the temperature display side, and a certain period of time until the timer ends is:
A digital display device characterized by having a configuration that gives priority to temperature display over clock display.