JPS6141206Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of a temperature control circuit in an air conditioner or the like, and one of its objects is to simplify a variable resistance device for temperature control.

Generally, this type of temperature control circuit is constructed as shown in FIG. In other words, the input side of comparator C is the temperature control volume _R1 and a series resistor.
It is connected to the connection point between the series circuit of _R2 and the temperature detection thermistor _R3 , and the reference input (+) of the comparator C is set by resistors _R4 , _R5 , and _R6 . Then, when the temperature is high, that is, the resistance value of thermistor _R3 is low, and the input voltage V(-) is lower than the reference voltage V.
(+), comparator C outputs and turns relay 1 ON, relay contact 2 of relay 1
turns on and loads the electric compressor, etc. (not shown)
Turn ON. Conversely, the input voltage V(-)
When is lower than the reference voltage V(+), relay 1
It becomes OFF state, relay contact 2 becomes OFF operation, and the load is turned OFF. In this way, the load is controlled on and off so that the temperature is determined by the temperature control volume _R1 .

Conventionally, the temperature adjustment volume _R1 of this circuit is made up of a plurality of resistors r101 to R101, as shown in FIG.
r109 are connected in series, and contact a and common contact b of the connection point of the series resistor are touched and moved by a sliding brush (not shown) to set a predetermined resistance value (temperature). This conventional temperature control volume _R1 has the drawbacks of requiring a large amount of installation space and increasing cost because of the large number of resistors constituting the volume.

The present invention solves the above-mentioned drawbacks of the conventional circuit and provides a variable resistance device for temperature control that has the same characteristics as the conventional circuit with a small number of resistors.

Hereinafter, the present invention will be explained with reference to FIGS. 2 to 4 of the accompanying drawings showing one embodiment thereof. First, the circuit diagram will be explained with reference to FIG.

In the figure, E is a resistance circuit in which a plurality of resistors r ₁ to _{r 4} having the same resistance value are connected in series, and A is the main resistance contact section, which connects each of the series-connected resistors r ₁ to r ₄ . It has a plurality of main contacts A ₁ to _{A 5} connected to the points. The main contacts A ₁ to _{A 5} are formed in an elliptical shape so that the resistors r ₁ to _{r 4} are switched every two points at the movement points (1) to (10) of the contactor D. B is the auxiliary resistance contact section, which has multiple contacts.
It is constructed by connecting in series B ₁ to B ₅ and a resistor r ₅ whose resistance value is smaller than each of the resistors r ₁ to _{r 4} ,
By moving the two points of the contactor D, it sequentially contacts each of the contacts A ₁ to _{A 5} of the main contact circuit, and each of the resistors r ₁ to _{r 4}
and this resistor _r5 form a series circuit. C is an auxiliary contact section, in which a plurality of contacts C ₁ to _{C 5} are connected in series. This auxiliary contact portion C sequentially contacts the main contacts A ₁ to _{A 5} every time the contact D moves two points, and also contacts each contact B ₁ of the auxiliary resistance contact portion B.
~B ₅ is arranged so as to be shifted from each other by one point of the contact D.

Therefore, when the contact D moves one point at a time, the main contacts A ₁ to A ₅ are alternately connected in series with the auxiliary resistor r ₅ of the auxiliary resistance contact portion B or the auxiliary contact portion C.

Here, when the main resistance contact part A, the auxiliary resistance contact part B, and the auxiliary contact part C are printed and wired on a printed circuit board, they become as shown in FIG. 4. Further, the contactor D moves over 10 points (1) to (10) in Fig. 2, connects the main resistance contact part A and the auxiliary resistance contact part B in series at each point, and connects the main resistance contact part A and the auxiliary resistance contact part B in series. , the auxiliary contact C is configured to short-circuit the resistor _r5 at odd-numbered points.

In the above configuration, in the state of point 1 in Fig. 2, contact A ₁ and contact C ₁ are in contact, and in Fig. 4, each contact A ₁ , B ₁ , C ₁ is in contact, and the temperature adjustment volume The resistance value between both terminals P ₁ and P ₂ of ₁ is O
becomes Ω. And at point 2, Figures 2 and 4
In both figures, contact A ₁ and contact B ₁ are in contact, and both terminals P ₁ ,
The resistance value between P ₂ is the resistance value of resistor r ₅ . Further, at point 3, since the contacts A ₃ and C ₃ are in contact in FIG. 2, and the contacts A ₃ , B ₃ , and C ₃ are in contact in FIG. 4, the resistor r ₅ is short-circuited.

In this case, since the contact A ₃ is connected to the connection point between the resistor r ₁ and the resistor r ₂ , the resistance value between the terminals P ₁ and P ₂ is the resistance value of the resistor r ₁ . Similarly, for each point, r ₁ + r ₅ , r ₁ + r ₂ , r ₁ + r ₂ + r ₅ ,
...and the maximum value is r ₁ + r ₂ + r ₃ + r ₄ + r ₅ . In this way, even with a circuit configuration of 5 resistors, 10
Point resistance changes can be realized.

Here, if the resistance value of resistor r ₅ is set as r (Ω), and the resistance value of each resistor r ₁ to r ₄ is set as 2r, then
As shown in the resistance characteristics in Figure 3, from O (Ω) to 9r
A variable resistance device that changes stepwise at equal intervals (r(Ω)) up to (Ω) is obtained.

Next, another embodiment of the present invention will be described with reference to FIG.

This figure shows a configuration in which the means for alternately connecting contacts B and C shown in FIG. 2 is combined with the means for intermittent shorting of resistor _r5 shown in FIG.
The case of a variable resistance device that changes 20 points using eight resistors, resistors R ₁ to R ₆ and low resistors R ₇ and R ₈ with a resistance value of 2r is shown.

That is, in the same figure, point 1 is O
(Ω), point 2 is the resistor R ₇ , R ₈ of contact G, H
are connected in parallel, the resistance value between both terminals P ₃ and P ₄ is r (Ω), similarly 2r (Ω) at point 3, 3r (Ω) at point 4, and so on, the resistance value r
(Ω) is added. This results in a maximum value of 19r (Ω)
It can be used until.

As is clear from the description of the embodiments above, the temperature control circuit for an air conditioner of the present invention has a plurality of resistors connected in series, and a resistance value smaller than that of the resistor is connected to the connection point of each resistor. The resistors are connected in series or short-circuited, and each connection point of the resistors is switched in sequence.The same characteristics as the conventional circuit can be achieved with a minimum number of resistors, and along with this, This has advantages such as ease of assembly, cost reduction, and miniaturization of the device.

[Brief explanation of drawings]

Fig. 1 is a temperature control circuit diagram of an air conditioner, Fig. 2 is an electric circuit diagram of a temperature control variable resistance device of a temperature control circuit according to an embodiment of the present invention, and Fig. 3 is a resistance characteristic of the variable resistance device. Figure 4 is a pattern configuration diagram for a printed wiring board for the variable resistance device,
FIG. 5 is an electrical circuit diagram of a temperature regulating variable resistance device according to another embodiment of the present invention, and FIG. 6 is an electrical circuit diagram of a conventional temperature regulating volume. A...Main resistance contact section, _A1 to _A5 ...Contact, B...
...Auxiliary resistance contact section, B ₁ - _{B 5} ... Contact, C ... Auxiliary contact section, C ₁ - _{C 5} ... Contact, D ... Contact, E
...Resistance circuit, r ₁ to _{r 5} ...Resistor.

Claims (1)

[Scope of utility model registration request] A resistance circuit E in which a plurality of resistors r ₁ , r ₂ , r ₃ , r ₄ are connected in series, and a plurality of main contacts A ₁ , A ₂ , A ₃ , A ₄ , A ₅ extending from between each of the resistors. A main resistance contact part A consisting of a plurality of contacts B ₁ , B ₂ , B ₃ , B ₄ , B _{5 and an auxiliary resistance r 5 having} a resistance value smaller than the resistance value of the above-mentioned resistor are connected in series. The connected auxiliary resistance contact part B and the auxiliary contact part C each have a plurality of contacts C ₁ , C ₂ , C ₃ , C ₄ , and C ₅ connected in series, and the main resistance is connected by the contact D. In a temperature control circuit for an air conditioner in which a contact part A, an auxiliary resistance contact part B, and an auxiliary contact part C are connected so that each contact corresponds to the other, by the movement of the contact D,
A series circuit consisting of the main resistance contact part A and the auxiliary resistance contact part B, and the main resistance contact part A and the auxiliary resistance contact part C.
or intermittently short-circuiting the auxiliary resistor _r5 of the auxiliary resistor contact B by the auxiliary contact C in the series circuit of the main resistor contact A and the auxiliary resistor contact B; A temperature control circuit for an air conditioner.