JPS58184617A - Temperature controller - Google Patents

Abstract

PURPOSE:To improve thermal response, by operating a timer after a self-holding means is reset, and switcing between the releasing of a temperature regulating means from fixation and the conduction of a TRIAC in one direction a specific period after the self-holding means is reset. CONSTITUTION:When a heater 2 attains to maximum temperature, a transistor (TR)39 turns off and a TR70 turns on to reset the operation of the self-holding means. The conduction of the TR70 turns off a TR49 to stop charging a capacitor 51, starting the timer. While the potential of a capacitor 51 is higher than the minus side input level of a comparator 54, the high level output of the comparator 54 is held. When the temperature of the heater 2 drops from the maximum temperature alpha, a pulse signal is led out of the collector of a TR21 in every zero-crossing state of an AC power source and the TRIAC 3 turns on in two directions again. Thus, the TRIAC 3 turns on and off repeatedly to hold the maximum temperature.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention fixes the setting of the temperature regulating means at a constant value (generally the maximum temperature) by operating the self-holding means, and also controls the introduction direction of the bidirectional switching element (hereinafter referred to as TRIAC). The present invention relates to a so-called ≠ lucky heat circuit that accelerates the temperature rise of the heater, and relates to a temperature control device equipped with a so-called #4 speed heat circuit that accelerates the temperature rise of the heater.

Conventionally, in the fast heating circuit of a temperature control device equipped with a fast heating circuit, when the heater reaches the maximum temperature, the self-holding means is released and the fixation of the temperature adjusting means is released (the set temperature by the temperature adjusting means is reached). ) When the conduction of the triac is switched to one direction (automatically), the temperature of the heater reaches the maximum temperature in a short time, so the temperature of the heating device is sufficient by the time the self-holding means is released. It's not rising.

The present invention was devised in view of the above-mentioned points, and operates a timer after the self-holding means is released, and after a certain period of time has elapsed after the self-holding means is released, the fixation of the temperature adjustment means is released and the conduction fan of the triac is switched to one direction. The present invention relates to a temperature control device equipped with a rapid heating circuit that can sufficiently warm the temperature of a heating device.

An embodiment of the temperature control device of the present invention will be described below with reference to the drawings.

In FIG. 1, a heater 2. triac 3
are connected in series to form the main circuit.

4. Resistor in the main circuit. Diode 5 Zener diode 6
series circuits are connected in parallel, and the capacitor 6 is connected via both ends of the Zener diode 60 and the diode
9 is connected to form a DC power supply. Further, a resistor 7.8 is connected to both ends of the Zener diode 60.
8 is connected to the base of the transistor 12, the emitter of the transistor 12 is connected to the low side of the DC power supply (the anode line of the Zener diode 6), and the collector is connected to the cathode side of the Zener diode 6 (the anode line of the Zener diode 6) via the resistor 11. (before smoothing of the DC power supply). The above diode 5. Resistor 14 in series circuit of Zener diode 6
The input terminal (AC side) of the rectifier bridge 15 is connected via the rectifier bridge 15, and the output terminal (DC side) of the rectifier bridge 15 is connected to
are connected to the base and emitter of a transistor 21, and a resistor 19 is connected between the base and emitter. The collector of the transistor 21 is connected to the high side of a DC power supply via a resistor 20. The collector of the transistor 21 is further connected via a resistor 22 to the base of a transistor 62, and the collector of the aforementioned transistor 12 is also connected via a resistor 13 to the base of a transistor 63. The transistors 62 and 63 are connected in parallel. A resistor 23 is connected to the disconnected DC power supply. A resistance bridge circuit consisting of a thermistor 24 and resistors 29, 30 as temperature detection means, and polyurethane 31 as temperature adjustment means is connected, and the output ends of the resistance bridge circuit are respectively connected to the bases of transistors 25 and 26 forming differential amplifiers. connected,
The emitters of transistors 25 and 26 forming the differential amplifier are shorted to each other and connected to the low side of the DC power supply via the resistor 27, and the collector of the transistor 25 is connected to the high side of the DC power supply.
The collector of the transistor 26 is connected via a resistor 28 to the high side of the DC power supply. The terminal connected to the collector resistor 28 of the transistor 26 constitutes the output terminal of the differential amplifier, and the output terminal is connected to the base of the transistor 33.
The emitter of the transistor 33 is connected to the high side of the DC power supply, the collector is connected to the transistor 340 pace, and the collector of the transistor 34 is connected to the high side of the DC power supply. A resistor 35 is connected between the base of the transistor 34 and the low side of the DC power supply, and the emitter of the transistor 34 is connected to a diode 10. A diode 18 . is connected to the base of the transistor 12 via a resistor 9 . It is connected to the base of transistor 210 via resistor 17. Further, it is connected via a resistor 41 and a diode 42 to the base of a transistor 70 serving as a self-holding means. The transistor 70 is connected to a DC power supply via a resistor 46, and the base of the transistor 7o is connected to a diode 44. It is connected to the connection end between the resistor 38 and the collector of the transistor 39 via a series circuit of a resistor 43. The transistor 39 is connected to a DC power supply via a resistor 38, and the transistor 3-
The base of 9 is connected to the high side of the DC power supply through a series circuit of a push-on switch 37 (closed only when the push button is pressed and opened when released) and a resistor 36. The collector of the transistor 70 and the base of the transistor 39 are short-circuited by a diode 40.
The connection end between the resistor 46 and the diode 47. It is connected to the base of a transistor 32 via a resistor 45, and the transistor 32 is connected in parallel to the volume 31. The connection terminal between the resistor 46 and the transistor 7o is a resistor 48.
is connected to the base of a transistor 49 through a resistor 50. It is connected to a DC power supply via a capacitor 51. The connecting end of the resistor 5° and the capacitor 51 is connected to (g) inputs of a comparator 54 as a timer. The inputs of the comparator 54 are connected to the connection terminals of resistors 52 and 53 connected to the DC power supply, and the output terminal of the comparator 54 is pulled up to the high side of the DC power supply by a pull-up resistor 55. It is connected to a connecting end between a diode 47 and a resistor 45 via a diode 56, and the connecting end is connected to a base of a transistor 58 via a resistor 57. The transistor 5
8 is the resistor 6 of the 59°60 resistors connected to the DC power supply.
The connection terminals of the resistors 59 and 60 connected in parallel with 0 are connected to the base of a transistor 61, which is connected between the base and emitter of a transistor 620.

The collectors of transistors 62 and 63 connected in parallel are connected to the base of transistor 660 via a resistor 64, the emitter of transistor 66 is connected to the high side of the DC power supply, and the collector is connected to the base of transistor 66, respectively. A resistor 65 is connected between the base and emitter of the transistor 66. The collector of the transistor 67 is connected to the high side of the DC power supply, and the emitter is connected to the gate of the triac 3 via a resistor 68. The self-holding means operates for a period T after release by the output signal of the regulator 54). (b) (li) The output signal of the self-holding means (collector signal of the transistor 70) causes the heater 2 to reach the maximum temperature in a period t after the button-on switch 37 is closed, and is released. (c) In the gate signal waveform of triac 3, when the self-holding means and timer are operating, the timer,
When the self-holding means is stopped, the voltage is applied to the gate of the triac 3 at the zero cross of each cycle of the AC power supply. ) is the energization waveform of the heater 2, which is a full wave of AC during the period (t+T) when the self-holding means and timer are operating (triac 3 conducts in both directions), and an AC waveform when the timer and self-holding means are stopped. (triac 3 conducts only in one direction).

In FIG. 3, when the push-on switch 37 is closed at the initial stage of energization and the self-holding means is operated, the maximum temperature α is reached in a period t, the self-holding means is released, and then the timer operates for a period T. or during that period σ) Heater 2 is at its maximum -
(Triac 3 conducts in both directions while maintaining the degree α),
When the operation of the timer stops, the temperature decreases to the set temperature β by the temperature adjusting means, and the set temperature β is maintained (the triac 3 is conductive in only one direction).

In the temperature control device for heating equipment, etc. configured as described above, first, at the initial stage of energization, the button-on switch 37 (a normally open switch that is ON only when the button is pressed and opens when released) is turned on.
Then, resistance 36. A base current flows to the base of the transistor 39 via the bush-on switch 37, and the transistor 39 is turned on. Then, the current flowing through the transistor 700 is injected by the transistor 39, so that the transistor 70 becomes 0FFt.
Since the collector potential 1d (El) (high level) K is 0, a base current flows to the transistor 39 via the diode 40. Therefore, even if the bush-on switch 37 is opened or closed, the transistor 39 is turned on, and the run transistor 70 is turned on.
The state of FF is maintained. (When the self-holding means has self-held), a base current flows to the base of the transistor 320 via the diode 47° resistor 45, so that the transistor 32 is turned on. This means that the volume 31 is electrically shorted and fixed (set) at the highest temperature as a temperature control means.

Further, a base current flows to the transistor 49 via the resistor 48, and the transistor 49 is also turned on.

Then transistor 49. The capacitor 51 is charged via the resistor 50, and when the voltage is divided by the resistors 52 and 53 and becomes higher than the input level of the comparator 54, the output of the comparator 54 becomes high level, and the output of the diode 56. Transistor 58 via resistor 57
(which is also supplied by the high level of the output of the self-holding means, i.e. the output of the self-holding means and the output of the timer are connected to the diode 47.56).
(The AND circuit is constructed by Therefore, the transistor 58 is turned on and the base current of the transistor 610 is bypassed, so that the transistor 61flO, FF.

At this time, resistance 14. Since the full-wave rectified signal is applied to the base of the transistor 21 via the full-wave rectifying bridge 15, the transistor/jisume 21 is turned off for a short period of time at the zero cross of the AC power supply. Then, the collector potential of the transistor 21 becomes a pulse signal synchronized with the zero cross of the AC power supply, and the pulse signal is transmitted to the transistor 6 via the resistor 22.
The transistor 62 is turned on for a short period of time at the zero cross of the AC power supply, and the transistors 66 and 67 are turned on following this. Therefore triac 3
Since a gate signal (period (t+T) in FIG. 2(c)) is applied to the gate of the triac 3 at the zero cross of each half cycle of the AC power supply, the triac 3 is bidirectionally conductive. The load waveform at this time is shown in Figure 2) during the period (t+T), the heater 2 is energized in both directions, the temperature of the heater 2 rises, and when it reaches the maximum temperature, the resistance value of the thermistor 24 decreases and the transistor 25 The base potential of the transistor 26 is
The level becomes lower than the base potential of the differential amplifier, and the operation of the transistors of the differential amplifier is reversed, with transistor 25 turned off and transistor 26 turned on. Slave transistor 26
The collector potential (output of the differential amplifier) becomes low level, and the base current of the transistor 33 flows, so that the transistors 83 and 34 are turned on. Therefore transistor 34 diode】8. The base current flows continuously into the transistor 21 through the resistor 17, so that the transistor 21 is continuously turned on, and since no pulse signal is led to the collector of the transistor 21, the transistor 62 is turned off.

At this time, the base current is also continuously applied to the transistor 12 through the diode 10 and the resistor 9, so the transistor 12 is continuously turned on and the transistor 1 is turned on.
The collector potential of transistor 2 is at a low level, and the transistor 63 is also at an O level.
Since it is an FF, the transistors 66 and 67 are not turned on and the triac 3 is turned off.

And again, at this time, the resistance 41. A base current is applied to the base of the transistor 70 via the diode 42, and the transistor 70 is turned on. Then transistor 70
The collector potential of transistor a 9''ko becomes low level, and the base current of transistor 39 is bypassed.
FF. Then, by turning off the transistor 39, the resistors 38, 43. Transistor 7 via diode 44
Base current flows to 0. Therefore, O of transistor 39
FF.

The ON state of transistor 70 is maintained. (The operation of the self-holding means has been canceled.The operation period of the self-holding means is the period t from the time when the button-on switch 37 is closed until the heater 2 reaches the maximum temperature α [Fig. 2 (b) , FIG. 3], and since the base current of the transistor 49 is also bypassed by turning on the transistor 70, the transistor 49 is also turned off, and charging of the capacitor 51 is stopped.

(The timer starts from this point) 0 At this time, the potential of the capacitor 51 is still higher than the input level of the comparator, so the high level output of the comparator 54 is maintained. And the heater 2 temperature is the highest temperature ←
), the resistance value of the thermistor 24 also increases, and the operation of the transistor of the differential amplifier is also reversed.
5 is turned on, and transistor 26 is turned off. Then, the output of the differential amplifier becomes high level, and the base current of transistor 330 stops flowing, and transistors 33 and 34 are turned off.
F, the collector of the transistor 21 derives a pulse signal at each zero cross of the AC power supply, and the triac 3 is bidirectionally conducted again. In this way, triac 3 is turned on
, OFF is repeated to maintain the maximum temperature α. Then, when the period T has elapsed, the electric charge of the capacitor 51 is discharged via the comparator 54, and the potential becomes lower than the (c) inputs of the comparator 54, so the comparator 51
No output is output to the output terminal of 4, and the output is at a low level. Therefore, no base current is supplied to the base of the transistor 32, and the transistor 32 is released from being fixed at the maximum temperature of the 0FFL volume 31. Also, since the transistor 58 is not supplied with base current and is turned off, the transistor 611d is supplied with base current through the resistor 59 and turned on.
in a state. Therefore, the collector potential of the transistor 21 (
Since the pulse signal) is bypassed by the transistor 61, the transistor 62 is turned off. Then, as described above, when the short circuit of the volume 31 is released, the base potential of the transistor 260 on the volume side of the differential amplifier becomes higher than the base potential of the transistor 250, and the transistor 26 is turned on.

Since transistor 25 is turned off, transistor 3
3.34 turns on, supplies base current to transistor 21.12, and turns off transistor 21.12.

Therefore, since transistors 62 and 63 become 6FF, transistors 66 and 67 are not turned on, and triac 3 is turned off.
Therefore, the heater 2 is not energized. The temperature of the heater 2 decreases, and the volume 31. The temperature set by (Fig. 3 β)
When this happens, the resistance value of the thermistor 24 increases, and the base potential of the transistor 25 of the differential amplifier becomes higher than the base potential of the transistor 260, turning the transistor 25 ON, transistor 26 OFF, and transistor 33. , 34 are OFF, and the collector 12 of the transistor 21.13 is output with a /% signal, but the collector potential of the transistor 21 is OFF, the transistor 61 is ON, and the transistor 62 is 0FFK. : Don't be ashamed of the influence of 1 or 3. Furthermore, since a pulsating current signal half-wave rectified by the diode 5 etc. is applied to the base of the transistor 12, the transistor 12 outputs 01jF at the rise of each l cycle of the AC power supply (the explanation is omitted since it is unnecessary at the fall). Therefore, the collector potential of the transistor 12 becomes a high-level pulse-like signal at the rise of each cycle of the AC power supply. The pulse signal is applied to the base of the transistor 63 via the resistor 13, and
In synchronization with the pulse signal, transistor 6 turns on when the AC power supply goes up and down every cycle.
6.67 is conductive, a gate signal is applied to the gate of the triac 3 at the rise of each cycle of the AC power supply, and the triac 3 is turned on only in one direction. (periods other than (t+T) in Figure 2). Then, the heater 2 is energized in a half-wave, and when the temperature of the heater 2 becomes higher than the set temperature, the operation of the differential amplifier is reversed, and the transistor 12 is turned OFF (FFL), and the differential amplifier 3 is turned OFF.

By repeating the above steps, the heater 2 maintains the set temperature constant by half-wave energization δ As explained above, by simple operation, when the temperature is desired to rise, the heater 2 is energized with AC full-wave and automatically switches to the timer circuit &1
After heating the heating device sufficiently, it automatically switches to the set temperature and maintains the set temperature with AC half-wave energization, making it extremely easy to use, heats up quickly, and is energy-saving. Therefore, it is possible to provide a temperature control device such as a heating device that provides a sufficient warming amplifier.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing one embodiment of the temperature control device of the present invention, FIG. 2 is a signal waveform diagram of each main part of FIG. 1, and FIG. 3 is a temperature characteristic diagram of the heater of FIG. 1.

Claims (1)

[Claims] 1. The heater is equipped with a temperature adjustment means, a temperature detection means, a self-holding means, and a timer, and controls conduction of a bidirectional switching element such as a triac in response to signals from the temperature adjustment means and temperature detection means. In a temperature control device in which the set temperature is fixed at one point regardless of the temperature adjustment means by operating the self-holding means when controlling the energization of the bidirectional switching element, When the temperature detection means detects the temperature fixed by the self-holding means, it releases the operation of the self-holding means and drives a timer, and when the timer stops, the set temperature is released from being fixed, and the bidirectional switching is activated. A temperature control device characterized by comprising means for making conduction of an element in one direction.