JPH029370Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) The present invention consists of a three-pole bidirectional thyristor (hereinafter referred to as a TRIAT) that controls energization to a load, and a temperature-sensitive magnetic material having mutually different Curie points. The present invention relates to a band-operated temperature control device using two temperature-sensitive inductors with magnetic cores constructed of.

(Prior Art) FIG. 1 shows an example of a conventional band-operated temperature control device using a triac. A combination of a commercial AC power supply 1, a triax 3, a voltage dividing resistor 4, and a temperature-sensitive inductor 5 in order to supply power to the temperature-controlled load 2 only in a certain temperature range;
A transformer T is combined with a combination of a commercial AC power supply 1', a triax 3', a voltage dividing resistor 4', and a temperature sensitive inductor 5'.

Regarding one combination, the first primary winding T11 of the transformer T and the triax 3 are connected in series to the commercial AC power supply 1. Further, a series circuit of a voltage dividing resistor 4 and a temperature-sensitive inductor 5 is connected in parallel to the series circuit of the first primary winding T11 and the triac 3, and the temperature-sensitive inductor 5 transfers the induced voltage to the gate of the triac 3. connected to supply. The temperature-sensitive inductor 5 uses a magnetic core made of a temperature-sensitive magnetic material having a rectangular hysteresis characteristic and a low Curie point _Tc1 , and is disposed close to a temperature-detected portion heated or cooled by the load 2.

The difference from the above description in the other combination is that the triax 3' is connected to the first primary winding T11.
is connected to the second primary winding T12 of opposite phase to
The Curie point of the magnetic core of the temperature sensitive inductor 5' is T _c2 which is higher than T _c1 .

The load 2 may be a heater, a cooler, etc. of an air conditioner, and is connected to the secondary winding T22 of the transformer T. First and second primary windings T11, T
12 and the number of windings of the secondary winding T22 are equal.

The band operation will be briefly explained with reference to FIG. 7 as well.

When the temperature of the detected part is less than the Curie point _Tc1 , the voltage dividing resistor 4, with the switches S and S' closed,
4' and the temperature-sensitive inductor 5, 5', the magnetic flux generated by the current flowing through the R-L circuit of the temperature-sensitive inductor 5, 5'
Since the magnetic core 5' has a rectangular hysteresis characteristic and saturates quickly, it becomes a trapezoidal wave that almost corresponds to the current waveform, and positive and negative voltage pulses are induced in the temperature-sensitive inductors 5 and 5' corresponding to the parts where the magnetic flux changes rapidly. be done. By setting this voltage pulse to be greater than or equal to the voltage pulse _Vpp required to fire the gates of the triacs 3, 3', the triacs 3, 3' are rendered conductive. In this state, the first
Since the primary winding T11 and the second primary winding T12 have opposite phases, the induced voltages of the two are canceled out, and no power is supplied to the load 2.

When the temperature of the detected part rises and reaches near the Curie point _Tc1 , the magnetic core of the temperature-sensitive inductor 5 becomes paramagnetic, so the temperature-sensitive inductor 5 receives the required voltage pulse.
_Vpp is not induced and therefore triax 3 is turned off (Figure 7a). In this state, power is supplied to the load 2 by the second primary winding T12.

When the temperature of the detected part further increases and reaches the Curie point _Tc2 , the magnetic core of the temperature-sensitive inductor 5' also becomes paramagnetic, and the triax 3' is also turned off (FIG. 7b).

In this way, as shown in FIG. 7c, the load 2
Power is supplied to the temperature range between the Curie points _Tc1 and _Tc2 . Such a function is required when, for example, battery charging, power is supplied within a certain temperature range and power supply is stopped outside the temperature range.

(Problem to be solved by the invention) By the way, in order to make such a temperature control device a band-operated type, in addition to the transformer T, two sets of temperature-sensitive inductors and triaxes are required, resulting in problems such as an increase in size and cost. There is.

In view of these problems, the technical problem of the present invention is to realize a band-operated temperature control device with a simple configuration.

(Means for Solving the Problems) The present invention consists of a temperature-controlled load driven by an AC power supply, a triax for controlling energization to the load, and a magnetic core having a predetermined first Curie point. A thermal inductor, which is disposed in the temperature sensing section and connected in parallel to the triac and the load via a voltage dividing resistor so as to apply the voltage induced in the thermal inductor to the gate of the triac. a temperature-sensitive inductor, the magnetic core having a second Curie point lower than the first Curie point between a connection point between the temperature-sensitive inductor and the gate of the triax and the resistor; It is characterized in that a temperature sensing inductor to be disposed in the temperature detection section is inserted and connected.

(Example) Examples of the present invention will be described below.

FIG. 2 is a circuit diagram showing an embodiment of the temperature control device according to the present invention. Components corresponding to those in FIG. 1 are given the same numbers.

The difference from FIG. 1 is that a magnetic core with a Curie point Tc1 lower than the Curie point Tc2 of the magnetic core of the temperature-sensitive inductor 5 is used between the connection point between the temperature-sensitive inductor 5 and the gate of the triac ₃ and the resistor ₄ . This is because the temperature-sensitive inductor 6 that was previously used was newly inserted and connected. FIG. 3 shows the magnetic permeability μ-temperature characteristics of these temperature-sensitive inductors. The solid line indicates the temperature-sensitive inductor 5, and the broken line indicates the temperature-sensitive inductor 6. In this device, the gate voltage V _g of the triax 3 is: V _g =V _p ωL ₅ /R ₄ +ωL ₅ +ωL ₆ However, R ₄ : Resistance value of resistor 4 ωL ₅ : Reactance of temperature-sensitive inductor 5 ωL ₆ : It is expressed by the reactance of the temperature-sensitive inductor 6, and each value is set to be the following value.

That is, as shown in FIG. 4, when the temperature detected part is in a low temperature range below the magnetic core Curie point T _c1 of the temperature-sensitive inductor 6, V _g is less than the value V _pp required to ignite the gate of the triax 3. It becomes a voltage pulse,
Set so that V _g becomes a voltage pulse of V _pp or more when the temperature detected part is in a medium temperature range that is higher than the Curie point T _c1 of the magnetic core of the temperature sensitive inductor 6 and lower than the Curie point T _c2 of the magnetic core of the temperature sensitive inductor 5. has been done. The temperature detected part is the Curie point of the magnetic core of the temperature-sensitive inductor 5.
Needless to say, V _g becomes almost zero above T _c1 (high temperature range). Therefore, as shown in FIG. 5, when the temperature-controlled load is a heater, the triac 3 becomes conductive only when the temperature-detected part is in the medium temperature range, supplies power to the load 2, and reduces the load current. It has a temperature control function of supplying power _Pw when the current temperature is within the range of the detection part temperature _Tc1 to _Tc2 .

FIG. 6 shows an example of application to a battery charging control circuit. Operating temperature of temperature switch 11 T _c1
is 5℃, and the Curie point T _c2 of temperature-sensitive inductor 5 is 48
If you select ℃, the temperature of the battery 7's outer case will start from 5℃.
It is possible to supply power for charging by the rectifier 8 in the range of 48°C, prevent overcharging in low temperature ranges, and by combining the temperature switch 11 with some kind of display means, the upper limit temperature of 48°C can be supplied. The end of charging can be detected by detection.

(Effects of the invention) As explained above, the band-operated temperature control device according to the invention can be realized in a small size and at a low cost by combining two temperature-sensitive inductors and one triax, and can be applied to large current loads. can.

[Brief explanation of drawings]

Figure 1 is an example of a circuit diagram of a conventional temperature control device.
Fig. 2 is a circuit diagram showing an embodiment of the invention, Fig. 3 is a magnetic characteristic diagram of a temperature-sensitive inductor used in the invention, and Fig. 4 shows the triac gate voltage V _g in the circuit of Fig. 2. A diagram showing the relationship with temperature,
Figure 5 is a diagram showing the relationship between temperature and power supply in the circuit of Figure 2, Figure 6 is a circuit diagram showing an example of application to a battery charging control circuit, and Figure 7 is the same as shown in Figure 1. FIG. 2 is a diagram for explaining the operation of a conventional device. In the figure, 1...AC power supply, 2...Temperature controlled load, 3...Triac, 5, 6...Temperature-sensitive inductor, 7...Battery, 8...Rectifier.

Claims (1)

[Scope of utility model registration request] a temperature-controlled load driven by an AC power source;
A bidirectional thyristor for controlling the supply of current to the load, and an inductor made of a magnetic core having a predetermined first Curie point, which is disposed at the temperature detection section and is connected to the thyristor and the load via a voltage dividing resistor. and an inductor connected in parallel to the inductor so as to apply a voltage induced in the inductor to the gate of the thyristor, the temperature control device comprising: a connection point between the inductor and the gate of the thyristor; 1. A temperature control device characterized in that an inductor made of a magnetic core having a second Curie point lower than the first Curie point and to be disposed on the object to be temperature detected is inserted and connected between the magnetic cores.