JPS58158722A - Temperature controller - Google Patents

Abstract

PURPOSE:To obtain a fast temperature rise and uniform temperature distribution, by designating the control voltage of a voltage controlled oscillator as a control signal of the trigger element of a control electrode, and controlling a fan mechanism and a heater through the conduction of the trigger element. CONSTITUTION:In setting a variable capacitor 7 of a table board 2 to a suitable value, a resonance frequency f0 is set. Further, a voltage controlled oscillator VCO3 is being in sweep oscillation, the signal is applied to a resonance circuit 8 and inputted to a detector 9. A comparator 12 compares resonance/ non-resonance, an output of the comparator 12 is fed to a P-UJT (PUT) 15 and a capacitor 14, and the anode potential of the PUT 15 is kept to a level corresponding to the frequency f0. this potential is supplied to the gate of a PUT 24 after applied with voltage division. A sawtooth wave potential is given to the anode of the PUT 24, and the PUT 24 is conductive when the anode potential of the PUT 24 is a gate potential or over, a pulse is generated in a pulse transformer 19B, and the power application of a motor M of the fan mechanism 38 and the amount of heat of a semiconductor heater 39 are controlled.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature control device in which the operating section and the control circuit section of the temperature control means are physically separated. In a temperature control device, when adjusting the amount of heat generated by the heater by varying the resonant frequency of the resonant circuit provided in the operating section, the control voltage of the voltage controlled oscillator is adjusted by detecting resonance or non-resonance of the resonant circuit. When generating the control voltage, the control voltage is applied as a control signal to a trigger element with a control pole, the conduction angle of the control element is determined by the conduction of the trigger element, and the rotation of the fan mechanism (fan and motor) is determined by the conduction of the control element. This relates to determining the number and determining the amount of heat generated by the semiconductor heater.

The following is an example of the present invention (example implemented in an electric Yagura Kotatsu)
will be explained in detail along the drawings.

FIG. 1 is an electric circuit diagram of an electric yagurakotuff which is an embodiment of the temperature control device according to the present invention, and FIG. 2 is a waveform diagram showing signal waveforms of each main part of the same.

In Fig. 1, 1 is the main body of the Yagura Kotatsu which has an electric heating part (heater and fan mechanism), etc., 2 is a table board which has an operation part (omitted), etc., and between the table board 2 and the main body 10 of the Yagura Kotatsu, there is a heat-retaining device. It is put into practical use with the help of futons and the like. 3 is a voltage controlled oscillator (hereinafter abbreviated as VCO), P
The oscillation frequency changes depending on the anode potential of the UT (programmable unijunction transistor) 15 (output of the relaxation oscillation circuit in Figure 2 (b)). 4A and 4B are electrodes for signal transmission and reception provided on the Yagura Kotatsu body l. ,
Reference numerals 5A to 5B are electrodes for signal transmission and reception provided on the table board 2, and are provided in pairs with and opposite to the above-mentioned 4A and 4B, respectively. 6 is an inductor, and 7 is a variable capacitor, which is linked to an operating section (not shown) and whose capacitance changes depending on the operation of the operating section.

The inductor 6 and the variable capacitor 7 form a resonant circuit 8, and by varying the capacitance value of the variable capacitor, the resonant frequency changes, which in turn changes the level of the control voltage of VCOA, and the control signal of the PLIT24 (
The level of the gate signal (gate signal) also changes, the amount of current applied to the motor of the fan mechanism, that is, the rotational speed of the fan mechanism changes, and therefore the amount of heat generated by the semiconductor heater also changes. Reference numeral 9 denotes a detector, and the oscillation signal of vcoa is supplied to the resonant circuit 8 of the table board 2 via the stray capacitance CA between the electrode plates 4A and 5A, and the signal increases the stray capacitance cB between the electrode plates 5B and 4B. The signal is inputted to this detector 9 via.

Then, a resonant/non-resonant state in the resonant circuit 8 is discriminated. 1
An amplifier 0 amplifies the output signal of the detector 9 and outputs the amplified signal. A detector 11 converts the output of the amplifier 10 into a DC value. 12 is a comparator, and when the resonant circuit 8 is resonant, its output is ■ (low), and when it is not resonant, its output is ■ (high). 13 is a resistor, 14 is a capacitor, 15 is PLIT, +
6.17.18 are resistors, and these form a relaxation oscillation circuit.
The ρ output is taken from the anode terminal of the PtJT I 5, and the output voltage is used as the control voltage of vcos and also as the PU
This is the control signal for T24. 19 is a pulse transformer (19A is the primary side, +9. is the secondary side), 20 is a diode, 21 (dnpn) transistor, 22.28 is a resistor, 24 is PtJT as an example of a trigger element with control pole,
25゜26.27 and 28 are resistors, 29 are capacitors, 3
0 is an npn transistor, 31.32 is a resistor, 33 is an npn transistor, :l, 35 is a resistor, 36 is a diode, 37 is a control element such as a triac (in this case, a triac is used), and 38 is a fan mechanism (fan and motor), 39 is a heater (#conductor heater, etc.). The full-wave rectified signal of the AC power source (not shown) is divided by resistors 34 and 35 and connected to the base of the transistor 33, and the transistor 33 is connected to the DC power source (+Vc
c, between the ground) and the connecting end of the resistor 31 and 32 connected to the ground. The connecting ends of the resistors 31 and 32 are connected to the base of a transistor 30, and the transistor 30 is connected via a resistor 28 between the connecting ends of a resistor 27 and a capacitor 29 connected to a DC power source and the ground. . Also, the connection end of the resistor 27 and capacitor 29 is P
It is also connected to the anode of LIT24. PtJT2
The cathode of 4 is connected to the base of transistor 210 via resistor 23.

The transistor 21 is the primary coil 19 of the pulse transformer.
A diode 20 is connected in antiparallel to both ends of the negative side coil +9A, and a resistor 22 is connected between the base and emitter of the transistor 2I. Further, the output (anode potential) of PUT + 5 is divided by resistors 25 and 26 and connected to be applied to the gate of PUT 24. The secondary coil 19B of the pulse transformer is connected between the G and Tl terminals of the control element (TRIAC) 37 via the diode 36. In Fig. 2, (A) is the voltage applied to the base of the transistor 33. (b) is the output of the relaxation oscillation circuit, that is, the anode potential of PLIT 15, the solid line (A) is at resonance, and the dashed line (B) is at non-resonance, and its output is At the lowest time, VCO3 oscillates at a frequency of +2,
At the highest time, vcoa oscillates at the frequency of fl. Therefore v
coa oscillates within the range of f1 to f2, and the resonant frequency fo (f1≦fo≦fez) can also be varied within that range. (c) is the anode potential of the PLIT 24, (b) is the input (output) signal of the pulse transformer 19, (e) is the energization waveform of the motor of the fan mechanism 38 (conduction waveform of the control element 37), and conduction ( Power is on). (f) is the AC power waveform.

To explain the operation mode of the Yagura Kotatsu temperature control device having the above configuration, first, by operating the operating section 3 (omitted) of the table board 2, the variable capacitor 7 is set to an appropriate value, and a certain resonance frequency fo is set. <J+≦fo≦f2)
is set. ■The oscillation of CO3 has a frequency of 11~f
2 is sweep oscillated, and the signal is sent to the electrode plate 4A-
It is applied to the resonant circuit 8 via a stray capacitance CA of 5A. It is also input to the detector 9 via the stray capacitance cB between the electrode plates 5F3-413. It is assumed that the detector 9 detects that the resonant signal is higher in level than the non-resonant signal. The signal is amplified by an amplifier 10 and converted to direct current by a detector 11. Then, the comparator I2 compares whether it is resonant or non-resonant, and the output of the comparator 11 is (high) when there is no resonance, and the output of the comparator 12 is (low) when it is resonant.

Since the output of the comparator 12 at the time of non-resonance is -, the capacitor 14 is charged via the resistor 13. Therefore, PLOT
The anode potential of 15 rises to a certain value (resistance 17.1
8 etc.), the charge on the capacitor 4 discharges through P[JT15 and drops to a low potential.

By repeating this process, the anode potential of P'tJT15 (
The potential of the capacitor 4) becomes a sawtooth potential as shown in (B) (dotted chain line) in Figure 2 (middle). However, when the resonance signal is detected by the detector 9, the output of the comparator 12 becomes ■, and the charge of the capacitor 4 is stopped.O and vcoa
Since the control voltage of VCO 3 is also stopped, the oscillation frequency of VCO 3 is temporarily fixed at the frequency at that time (resonant frequency fo). However, as the electric charge of the capacitor 4 is discharged and the potential of the capacitor 4 decreases, the control pressure on the VCO 3 decreases, and the oscillation of the VCO 3 also deviates from the resonant frequency fo. Then, the comparator 12 becomes non-resonant.
The output becomes ■, the capacitor 4 is charged, the potential rises, and the response to the resonance frequency IO stops again at the level (because the output of the comparator 12 becomes 0, which is not the fundamental frequency) 0 By repeating this, the capacitor 4 The potential of PLIT15, that is, the anode potential of PLIT15, is at the resonance frequency f, as shown in FIG.
It is kept almost constant at the level aQ corresponding to O. Therefore, the control voltage applied to vcoa is constant (Fig. 2 (b)) (
A) Because of this, the oscillation frequency of vcoa is also constant (fo), and this state continues. Then, the anode potential of PUT+5 (Figure 2 (B)) is divided again by the resistor 25.26 (as the signal indicated by the dotted line ao' in Figure 2 (C)).
It is applied to the gate of JT24. Transistor 33 turns on at approximately 0.7V or more (turns OFF only when the AC power supply zero crosses), so transistor 30 turns ON only when the AC power supply zero crosses (only when transistor 33 turns OFF).
do.

Therefore, the potential of the capacitor 29 (the anode potential of the PLIT 24) becomes a sawtooth potential synchronized with the AC power source as shown in FIG. 2(c). When the anode potential of the PLOT 24 becomes equal to or higher than the gate potential (ao' potential in FIG. 2(c)), the PUT 24 becomes conductive in a one-shot manner, and therefore the transistor 21 also becomes conductive in a one-shot manner. Therefore, a signal as shown in FIG. 2 is induced in the pulse transformer 19B and applied to the gate of the control element (TRIAC) 37 as a gate signal. Then, the triac 37 is brought into conduction and the motor of the fan mechanism 38 is energized. However, in terms of timing, when the PtJT 24 becomes conductive, the conduction angle α is 1°. The motor (and the fan) rotates at a rotational speed commensurate with the conduction angle α, that is, the effective applied power, and blows air to the semiconductor heater 39, which generates a heat amount corresponding to the amount of air blown. The conduction angle α, that is, the effective power applied to the motor, and by extension the amount of heat generated by the semiconductor heater 39 changes the capacitance of the variable capacitor 7 of the resonant circuit 8, and the resonant frequency fO of the resonant circuit 8, which in turn changes the PtJT I 5 This can be changed by varying the anode potential (level aO in FIG. 2(B) and (A)).

As described above, according to the present invention, it is possible to create a temperature control device using hot air in which the operation part and the control circuit are separated with a simple circuit configuration, and by applying it to, for example, a Bugura Kotatsu, the temperature can rise very quickly. In addition, we can provide a temperature control device for Yagura Kotatsu that is easy to use and has a uniform temperature distribution.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram of an electric roof kotatsu, which is an embodiment of the temperature control device according to the present invention, and FIG. 2 is a waveform diagram showing signal waveforms of each main part of the same. 3: Voltage controlled oscillator, 8: Resonant circuit, 24: Trigger element with control pole, 37: Control element, 38: Fan mechanism, 39
: Semiconductor heater.

Claims (1)

[Claims] 1. A semiconductor heater whose resistance value changes depending on the temperature, a fan mechanism consisting of a fan and a motor for controlling the amount of heat generated by the semiconductor heater, a control element that controls energization to the motor, and a voltage A controlled oscillator and a resonant circuit are provided, the control voltage of the voltage controlled oscillator is varied by varying the resonant frequency of the resonant circuit, the oscillation frequency of the voltage controlled oscillator is varied, and the energization of the motor is varied. In doing so, applying a control voltage of a voltage distribution control oscillator as a control signal to a trigger element with a control pole, controlling conduction of the control element by conduction of the trigger element with a control pole, and controlling energization of the motor; Furthermore, a temperature control device is characterized in that the amount of heat generated by the semiconductor heater is controlled.