JPS618559A - Foot warmer by warm air - Google Patents

Abstract

PURPOSE:To obtain a foot warmer by warm air wherein the speed of rise in temperature is high and the service lift of the heat generating body is long, by changing the zero-bolt ignition control of the electric power control system intermediately to the phase angle control. CONSTITUTION:A temperature detector 4 for detecting the temperature in a foot warmer is provided in an air current path of a warm air generating apparatus. Until a set value of rise in temperature, a zero-volt ignition control means 5 to which a signal from the detector 4 is inputted makes a bi-directional thyristor 10 to be on at the position of zero volt of the start of a power source 12, and a voltage having an conductive angle of 180 deg. is applied to a heat generating body 2 to raise the temperature in the foot warmer. When the temperature in the foot warmer has risen and has reached to a value T set by a temperature setting circuit 21 made up of a set temperature variable resistor 23 and a temperature setting circuit 21, a phase angle control means 6 causes the bi-directional thyristor 10 to be turned on at a position delayed by theta<1> and a voltage equal to a quantity of a conductive angle of 180-theta1 degree is applied to the heat generating body 2. The position theta1 of the output pulse is transferred to theta2 linearly, and by changing the conductive angle of the voltage applied to the heat generating body 2, the temperature in the foot warmer can be kept constant.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of the Invention] The present invention relates to a hot air kotatsu that is completely equipped with a hot air generating device that uses a heating element consisting of a positive temperature coefficient thermistor.

[Conventional technology]

Generally, when all power control is performed for a heating element, the voltage waveform shown in FIG. 1 is so-called ON.

There are an OF'F energization rate control method and a phase angle control method whose voltage waveform is shown in FIG.

The ON/OFF energization rate control method is 100% energized at startup until the set temperature is reached.

OFF, oNk < Temperature control is performed again.The one-phase angle control force type is such that the energization angle is gradually changed and all temperature control is performed from startup to set seat temperature to stabilization. .

By the way, when Kowara's method is used to control the temperature of a heating element consisting of a positive temperature coefficient thermistor, in the former method, ON,
The difference in temperature when it's OFF is pleasant.

The repetition of the inrush current when ON has a significant effect on the life of the heating element.On the other hand, in the latter method, as can be seen from the knee v characteristic of the heating element shown in Figure 3, it is possible to control the phase angle. The range is narrow (above a certain voltage as it exceeds the Curie temperature).

I can't control it. ), there were problems such as slow rising speed.

[Summary of defense]

This invention was developed in view of the above points.

The purpose of the present invention is to provide a width kite kotatsu that can eliminate all of the above-mentioned conventional disadvantages by energizing 100% with zero-holt ignition control at startup and switching to phase angle control after reaching the set temperature. There is.

[One example of implementing the invention] An embodiment of the present invention will be described below with reference to the drawings.

In other words, Kaku 5 is the overall configuration diagram of Henfu Kotatsu, and 9
As is clear from this figure, there is a heating element (2) made of Kotatsu Yagura (positive temperature coefficient thermistor force in 11) and a blower (
A Hatakekaze generation device consisting of 31 and 31 and 31 and 31 power was installed.

A temperature detector (4) is installed in the ventilation path of this hot air generator to detect the temperature inside the kotatsu, and the detection signal from this altitude detector (4) is used as input until the temperature is set for the start-up.

The heating element (2) is activated by the 70 volt ignition control means (5), and when the set temperature is reached, the 1st phase angle control means (6) K is activated.
) is configured to control.

FIG. 6 is a circuit diagram 1 of the embodiment of FIG. In the figure, the eel is A/D converter 04. Memory am, CPUa
a, input circuit (lη, output circuit a sand? It's a built-in microcomputer, 09 is an altitude detector (4) and a resistor (
It is a voltage dividing resistor circuit consisting of a) and force). C! D is a temperature setting circuit consisting of a variable setting temperature resistor and a resistor Q2. (2) and (c) are the input terminals of the A/D converter α built in the microcomputer αJ,
In order to convert the analog potential of the voltage dividing resistor circuit αL (C7υ) into a digital value, it is input to the A/D converter t14).

Zero volt ignition control means (5) and phase angle control means (6
) is the microcomputer 131. Resistor (c), transistor (2), resistor (to), bidirectional thyristor +
101. It consists of a heating element (2). (12 is a commercial frequency power supply.

Next, the operation of the above embodiment will be explained with full reference to FIG.

FIG. 7 is a flowchart showing the zero-volt ignition control and phase angle control programs stored in the memory 09 of the microcomputer (13+). In FIG. 1, step 01 is the zero-volt ignition control program. and step 011. C33 shows a flow diagram of phase angle control.

The complete program for zero-holt ignition control will be explained.

When 5TART is applied, the output of the output circuit for 0 seconds is )(igh
Vc na shi.

As shown in Fig. 8, a full pulse is generated at a position centered around zero volts at the rising edge of the voltage applied to the heating element, the transistor @ is turned ON via the resistor (c), and the resistor @ is fully connected to both thyristors (If gate current flows, and the bidirectional thyristor 0I1
1 is '&, the source α2 is turned on at the position of the 7th bolt (cerohort ignition). 1 heating element (2) K is the conduction angle 180
A voltage of 1.5 degrees is applied, raising the temperature inside the kotatsu. The spiritual level t in the kotatsu is the altitude detector (4).

The input terminal C! of the microcomputer t131 is connected from the resistor head to the voltage dividing resistor (b) path a9. 41. 'A,/
The input circuit αηV (sequential input is applied to the D converter α4).
When the value TK set in is reached, the output pulse generation position of the output circuit α& shifts. Step 6υ, 03e
ζ transition.

Next, the phase angle control program r will be explained.

Phase angle control is a process to keep the kotatsu interior constant. When the altitude inside the kotatsu reaches the set value Tr (the output pulse of 0 seconds from the output circuit is delayed) from the power supply shown in Fig. 8 [position force of 9 zero volts at the start of 12], the ul shown in Fig. 9) is delayed. Move to position. Therefore, the bidirectional thyristor OQ via the transistor is also turned on at a position delayed by θ1, and a voltage with a conduction angle of 180-01 degrees (conduction angle) is applied to the heating element (2). Then, it linearly shifts to the output pulse positions 01 and 02.

Change the conduction angle of the voltage applied to the heating element (2) (18
0-θ2#i, small conduction angle] to keep the inner degree of the kotatsu constant.

In the above embodiment, a positive temperature coefficient thermistor is used for the first heating element (2), but it is possible to change the first heating element (2) to an ordinary infrared heater. The switching means is performed by the microcomputer αJ, but it is also possible to replace it with a microcomputer f13, a timer, etc. [Effects of the Invention] As described above, according to the present invention, the JFkL force control By switching the method from 7-roport A arc control force to phase angle control midway through, the start-up temperature rises quickly and the heating element has a long life. We can provide this to you.

By controlling one force with one width detector, the imaginary number of one part is reduced, which has the effect of reducing costs.

[Brief explanation of drawings]

Figure 1 is a voltage/waveform diagram for the triON and OF F conduction rate control methods, Figure 2 is a voltage waveform diagram for the phase angle control method, Figure 3 is a current-voltage characteristic diagram for a positive temperature coefficient thermistor, and Figure 4 is a diagram of the current-voltage characteristics of a positive characteristic thermistor.
The figure is an overall configuration diagram showing one embodiment of the hot air kotatsu according to the invention, aSa is its (b) schematic diagram, Figure 6 is a flowchart showing the operation, and Figure 7 is the output pulse and heating element of the Cerroholt small arc control method. FIG. 81-8 is a voltage waveform diagram for the phase angle control method. In the figure, (1) is Kotatsu Yagura, (2) is the heating element, (31
is the blower, (4) is the temperature detector, (5) is the zero-volt ignition control means, f6114 phase angle control means Representative Masuo Oiwa (2 others) Fig. 1 Fig. 2 f41!2) Fig. 6 Off diagram

Claims (2)

[Claims] (1) A hot air generating device having a heating element made of a positive temperature coefficient thermistor in the air flow path of the blower, and a temperature detector for detecting the temperature inside the kotatsu, which is provided in the space inside the tower. A hot air kotatsu characterized by comprising zero-volt ignition control means and phase angle control means for controlling the power of the heating element based on a detection signal. (2) The hot air kotatsu according to claim 1, wherein the power control means for the heating element is a device that switches between zero-volt ignition control and phase angle control in response to changes in temperature within the kotatsu.