JPS583701B2 - Denshiki Okiyuki - Google Patents

Description

[Detailed description of the invention] The present invention relates to an electronic moxibustion device.

Conventionally, there are various methods that electrically apply temperature stimulation for heating and cooling similar to thermal moxibustion, but in this case, the problem is that even if used incorrectly, the heating temperature This means implementing safety measures to ensure that the temperature does not exceed a certain value.

In other words, it would be impossible to put it into practical use without a temperature control function that would prevent burns even if the heating state continues for a long time after the power switch is turned on.

The present invention has been made in view of these points, and an object of the present invention is to provide an electronic moxibustion device in which the temperature of the conductor does not exceed a predetermined value.

The present invention provides a device in which a control transistor is connected to a relay that selectively energizes a conductor and an air cooling circuit to perform heating and air cooling, and a capacitor that is charged when the conductor is energized is provided. The present invention is characterized in that an overheat prevention circuit is provided which switches the control transistor to cut off current to the conductor when the voltage between the electrodes of the capacitor exceeds a certain value.

Therefore, a control transistor is connected to a relay that selectively energizes the conductor and the air cooling circuit, and the operation of the control transistor is periodically switched automatically or manually during normal operation. If the energization time becomes longer for some reason, the voltage between the electrodes of the capacitor is detected and the control transistor is automatically switched to cut off the energization to the conductor to ensure safety.

An embodiment of the present invention will be described based on the drawings.

Reference numeral 1 denotes a power supply circuit, which is connected to a secondary winding 3 of a transformer 2 connected to a commercial power source, to a conductor 4 and a make contact 6 of a relay 5, and is also connected to a rectifier stack 7. A resistor 8, a Zener diode 9, a power 1 transistor 10, and a smoothing capacitor 11 are connected to the positive side of 7 for smoothing and constant voltage.

An air cooling time setting circuit 12 is connected to such a power supply circuit 1.

This air cooling time setting circuit 12 is a monostable multi-by-break circuit including a transistor 13 that is normally ON and a transistor 14 that is OFF, and the operating time is set by a time constant circuit including resistors 15 and 16 and a capacitor 17. .

A manual switch 18 connected to a power source is also provided,
This manual switch 18 is connected to the base of a transistor 20 via a stabilizing resistor 19, and the collector of this transistor 20 is connected to the monostable multivibrator with a negative signal via a differentiator circuit consisting of a capacitor 21 and a resistor 22, and a diode 23. said transistor 1 to trigger
It is connected to the base of 3.

Next, the collector of the transistor 14 is connected to the base of a control transistor 25 of the heating/air cooling circuit 24 via a resistor 26, and the control transistor 25 is connected to the relay 5.

A pump 28 serving as an air cooling circuit driven by commercial power is connected to the breaker contact 27 of the relay 5.

Further, the air cooling time setting circuit 12 and the heating air cooling circuit 2
4, an overheat prevention circuit 29 is provided.

That is, a cyrisk 30 is connected between the base and emitter of the control transistor 25.
A resistor 31 and a Zener diode 32 are connected between the gate of the transistor 14 and the collector of the transistor 14 .

A capacitor 33 is connected between the connection point between the resistor 31 and the Zener diode 32 and the ground, and the collector of a transistor 34 is connected via a resistor 35, and the base of the transistor 34 is connected via a resistor 36 to the ground. Connected to the collector of transistor 13.

In such a configuration, if the conductor 4 is fixed at an appropriate position on the skin and the power is turned on, since the transistor 14 is OFF in the steady state, the control transistor 25 is ON, and the relay 5 is energized to close the make contact. 6 is closed, the conductor 4 is energized.

As a result, the temperature of the conductor 4 gradually rises, and finally reaches just below its tolerable limit.

When this state is reached, the manual switch 18 is turned on.

As a result, the transistor 20 turns on and its collector voltage falls, and this state is maintained between the capacitor 21 and the resistor 22.
This applies a negative signal to the base of the transistor 13 via the diode 23 to trigger it.

As a result, the transistor 14 is turned on, turning off the control transistor 25, cutting off the power to the relay 5, turning on the breaker contact 27, and driving the pump 28.

The air flow generated by this pump 28 passes through a pipe (not shown). Air-cool the conductor 4.

This air-cooling time is determined by the operating time of the air-cooling time setting circuit 12, which is a monostable multivibrator, and when that time elapses, the transistor 14 is turned off and the conductor 4 is energized as described above.

This time width can be expanded or contracted by adjusting the resistor 15.

Then, the manual switch 18 is turned on again at a point where the patient feels optimal.

In this way, the highest point of heating temperature is determined by the patient's will each time the current is applied.

However, if you forget to press the manual switch 18, or if someone who does not know the function of this manual switch 18 uses it, the conductor 4
It is extremely dangerous when the temperature of

Therefore, the overheating prevention circuit 29 is designed to cut off the current to the conductor 4 at a point that does not cause burns, regardless of psychological problems.

That is, when transistor 14 is OFF, transistor 13 is ON, and therefore transistor 34 is OFF.
Since it is F, when the conductor 4 is energized, the capacitor 33 is charged, and the voltage on its + side gradually increases.

In the above case, when the transistor 13 is reversed, the transistor 34 is turned on and the capacitor 33 is discharged each time, but when the manual switch 18 is not pressed, the voltage increases over time and finally The Zener diode 32 becomes conductive and turns on the Cyrisk 30.

As a result, the control transistor 25 turns OFF, switches the relay 5, and cuts off the current to the conductor 4.

As described above, the present invention charges a capacitor when the conductor is energized, and repeatedly heats the capacitor in a range where the voltage between the capacitors is normally low, and when heating continues, the voltage between the capacitors increases. When a certain value is reached, the overheating prevention circuit operates, which switches the control transistor and switches the relay to the air cooling circuit side, cutting off the current to the conductor to prevent its temperature from exceeding a certain value. west,
In any case, it is possible to prevent the risk of becoming hot enough to cause burns or pain.

BRIEF DESCRIPTION OF THE DRAWINGS The drawing is a circuit diagram showing an embodiment of the present invention. 4... Conductor, 5... Relay, 25...
...Control transistor, 28...Pump (
air cooling circuit), 29... overheating prevention circuit, 33...
...Capacitor.

Claims (1)

[Claims] 1 In a device in which a control transistor is connected to a relay that selectively energizes a conductor and an air cooling circuit to perform heating and air cooling, a capacitor that is charged when the conductor is energized is provided, and this capacitor An electronic moxibustion device characterized in that an overheating prevention circuit is provided which switches the control transistor to cut off current to the conductor when the voltage between the electrodes exceeds a certain value.