JPS58201117A - Temperature regulating device of air conditioner or the like - Google Patents

Abstract

PURPOSE:To reduce an error and to speed up decision making by comparing the developed voltage of a resistance ladder circuit which consists of a differential resistance and temperature adjusting resistances and is powered on intermittently by a microcomputer with the developed voltage of a temperature sensing element. CONSTITUTION:A desired temperature is set with switches 11-14 and inputted to a microcomputer muCOMP4. The muCOMP4 is provided with the resistance ladder consisting of resistances 5-8 corresponding to the switches 11-14 and the differential resistance 21 for turning on and off an unshown compressor reperatedly at a specific period, and a voltage developed at the connection point of resistances 9 and 10 is inputted as a reference voltage V+ to the plus terminal of a comparator 3. A voltage V- at the connection point of the temperature sensing element 1 and a resistance 2 is inputted as a detected temperature to the minus terminal of the comparator. When the V- is higher than the V+, the output of the muCOMP10 is applied to turn on a TR17 through a resistance 16, and a relay 15 closes a contact 18 to put the compressor in operation. Consequently, the on-off period is shortened and the decision making time of temperature detection is shortened to reduce a detection error.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature control device such as an air conditioner.

Conventionally, this type of temperature control device, as shown in FIG. Hereinafter referred to as LSI) Output capo of 4) a,
A resistor ladder circuit is constructed by resistors 5 to 8 connected to b, c, and d in two pages each, and together with resistors 9 and 1o, a step waveform voltage V(+) shown in the operation example in Fig. 4 is generated. The voltage v0 was used as the reference voltage of the comparator 3.

Then, determine the value of this voltage V0 and input voltage v(-),
The output of the comparator 3 is input to the input port e of the LSI 4. Further, temperature control switches 11 to 14 input a set temperature in binary code to the LSI 4, and a relay coil (v15) is driven by a transistor 17 connected to the output port f of the LSI 4 via a resistor 16. Turn on this relay contact 18,
By performing the OFF control, the compressor (not shown) of the air conditioner is controlled to be ON and OFF. In addition, 19
is a diode, and 20 is a power supply.

In the above configuration, when the input voltage V(-) is higher (the temperature is higher) than the value of the step waveform voltage V(+) corresponding to the OFF point of the temperature set by the temperature control switches 11 to 14, the output of the LSI 4 is Port f outputs, transistor 17
is turned on, relay coil 3 page 15 is turned on, and relay contact 18 is turned on.
Turn on the compressor by turning it on to perform cooling operation.

This state is shown in area A of FIG.

In addition, the staircase waveform voltage V(+
), if the input voltage V(-) is lower (lower temperature) than
LSI4 stops its output and stops the compressor of the air conditioner.

This state is shown in area D of FIG.

The step waveform voltage of the conventional temperature control circuit described above is capable of detecting the entire temperature control range, and therefore requires a large number of voltage steps. Therefore, the scan time t of the step waveform voltage shown in FIG. 4 becomes long, and the temperature detection judgment time becomes long, and detection errors are likely to occur.

The present invention eliminates the above-mentioned conventional drawbacks.

Hereinafter, FIGS. 1 and 2 of the accompanying drawings showing one embodiment of the present invention will be described.
This will be explained with reference to the diagram. Here, the general operation of the air conditioner is well known and will therefore be omitted. Components that are still the same as those in the conventional example will be described with the same reference numerals.

In the figure, the difference from the conventional example is that the reference voltage V (+
) The only difference is the method of generation, but the other operations are exactly the same. Therefore, the method for generating the reference voltage V(+) will be mainly explained.

In other words, in Fig. 1, the output port a% of LSI4
Resistors 5 to 8 connected to d are temperature control resistors 11 to 1.
Corresponding to 4, output in a nutty state. Also resistance 2
1 determines the differential for ON/OFF operation of the compressor, and is determined by the output port g of the LSI 4.
ON and OFF outputs are repeatedly output at a constant period T. Then, the combined output of resistors 6 to 8 and resistor 21 is set to resistor 9 and resistor 10.
, and the voltage at the connection point is connected to the comparator 3.
The reference voltage is set to ■(+).

Therefore, the reference voltage V(+) has a voltage waveform with an ON point corresponding to the set temperature and a differential of 077 points, and when the set temperature is changed, the voltage level increases or decreases while maintaining the differential. will be moved to.

This state is shown by V(+) in the time chart of Figure 2.
page.

In the above configuration, when the multi-input voltage V(-) is higher than the voltage at the 077 point of the set temperature, the output capo) f of LSI 4 is outputted ON, and conversely, the OFF piezoelectric multi-input voltage v(-) is output.
) becomes low, the output port f of LII4 is turned off.
Output. The ON point voltage at the set temperature is still the multi-input voltage V (
-) becomes high, I, the output capo of SI4 -) f is O
This will result in N outputs. This state is shown in area C in FIG.

Furthermore, when the set temperature is changed, the - voltage level of the reference voltage V(+) changes, and the reference voltage V(+) after the change
In response to this, LSI4 turns output port f ON, but not yet OFF.
It outputs FF and maintains the set temperature. This state is shown in area D in the figure.

Here, since the reference voltage V(+) always has only two levels, the ON point and the 077 point, the change time T of the reference voltage V(+) is extremely short.

Therefore, according to this configuration, the voltage at the connection point between the temperature sensitive resistance element 1 and the series resistor 2 is taken as the input voltage V-, and the voltage generated in the resistance ladder circuit by the temperature adjustment resistors 6 to 8 and the differential 6 page resistor 21 is set as the input voltage V-. In a temperature detection circuit consisting of a comparator 3 with a reference voltage V+ of
As a result, the determination time for temperature detection becomes extremely fine, and the detection error becomes small.

Since the temperature setting state can still be confirmed by the output state of the output ports 1a to 1d of the LS 14, serviceability is greatly improved.

As is clear from the above embodiments, 1. The humidity control device such as an air conditioner according to the present invention uses the voltage at the connection point between the temperature-sensitive resistance element and the series resistor as one input voltage of the comparator,
A temperature detection circuit is provided that uses a voltage generated in a resistance ladder circuit consisting of a temperature adjustment resistor and a differential resistor as the reference voltage of the other comparator, and the differential resistor is periodically energized by a microcomputer. This makes it possible to change the reference voltage of the comparator in a short time, and as a result, the judgment time for temperature detection can be extremely shortened, reducing detection errors and making it easier to use during after-sales service. The temperature setting state can be checked from the output state of the output port of the microcomputer, so it has various advantages such as improved work efficiency.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram of a temperature control device according to an embodiment of the present invention, FIG. 2 is an operation time chart of the same temperature control device, FIG. 3 is an electric circuit diagram of a temperature control device showing a conventional example, and FIG. The figure is an operation time chart of the temperature control device. 1...W? M resistance element, 3... comparator, 4... microcomputer, 5~8°°°
Temperature adjustment resistor, 21...Differential resistance, 11-14...Temperature adjustment switch. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2

Claims (1)

[Claims] Temperature detection in which the voltage at the connection point between the temperature-sensitive resistance element and the series resistor is used as the input voltage for one side of the comparator, and the voltage generated in the resistance ladder circuit consisting of the temperature adjustment resistor and the differential resistor is used as the reference voltage for the other side of the comparator. A temperature control device for an air conditioner, etc., comprising a circuit, and further comprising a microcomputer to periodically energize the differential resistor intermittently.