JPH043077B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an electric heating device such as an electric carpet, which has a function of exterminating pests such as mites and a function of clearly indicating its operating status.

[Background Art] Conventionally, in electric heating devices such as electric carpets, pests may grow on the surface or inner surface. It is especially common for dust mites to live there. Possible ways to exterminate this species include chemical extermination methods using drugs and physical extermination methods such as induction heating, but both require large-scale systems.

[Objective of the Invention] The present invention has been made in view of the above points, and its purpose is to provide a system that uses the heat of the heating element itself to set a temperature that easily exterminates pests with a single switch operation. To provide an electric heating device which notifies a user of the insecticidal operating state and its termination either explicitly or without notice, and which can automatically return the operating state to the state before the insecticidal operating state when the insecticidal operating state ends. be.

[Disclosure of the Invention] The present invention provides an electric heating device including a heating element, a temperature detection means for detecting the temperature of the heating element, and a temperature setting means for setting the temperature of the heating element, and an insecticide setting switch. insecticidal means for setting and maintaining the temperature of the heat generating element at the set insecticidal temperature level for a predetermined period of time after the insecticidal setting switch is turned on, regardless of the previous temperature level; and clearing means for clearly indicating the insecticidal operating state during the holding period. , a return means for notifying the end of the retention period and returning the operating state to the state before the insecticide setting switch was turned on, and the device automatically controls heating for a predetermined period of time by operating the insecticide setting switch. The heat generating temperature of the heating element is set to the insecticidal temperature level to exterminate pests, and at the same time, the user is clearly shown that the insecticidal operation is in operation, and when the insecticidal operation is finished, the user is informed that the insecticidal operation is terminated. The device is characterized by being able to notify the user of the change and automatically return the device to the state before the switch was operated.

The present invention will be explained below with reference to Examples.

Embodiment 1 Figure 1 shows a circuit block of this embodiment used in an electric carpet.A power supply circuit 3 is connected to a commercial power supply 1 through a power switch SW to supply DC power _Vcc to various parts. Further, a heating element _H1 is connected via a power switch SW and a relay contact _r1 . The heating element _H1 is energized and generates heat when the power switch SW and the relay contact _r1 are on. The heat generation temperature of the heat generating element H ₁ is detected by a heat sensitive material such as a plastic semiconductor, and the sensor electrodes S ₁ and S ₂ on both sides of the heat sensitive material are connected to the entire surface where the heat generating element H ₁ is arranged. A voltage corresponding to the heat generation temperature is generated between the sensor electrodes S ₁ and S ₂ , and this generated voltage is rectified and smoothed by the detection circuit 4 and extracted as a temperature detection signal. The temperature detection signal voltage is input to the switching circuit 5 and compared with a preset temperature setting signal voltage. When the temperature detection signal voltage is lower than the temperature setting signal voltage, the switching circuit 5 turns on the transistor _Q1 to flow the excitation current from the DC power supply circuit 3 to the excitation coil _Ry of the relay.
Conversely, when the temperature detection signal voltage becomes higher than the temperature setting signal voltage, the transistor _Q1 is turned off to cut off the excitation current. When the relay operates, it turns on the above relay contact _R1 and turns on the heating element _H1.
When the heating element H1 is not in operation, the relay contact _r1 is turned off to cut off the power supply to the heating element _H1 .

The heat-sensitive material, the detection circuit 4 constituting the temperature detection means, the switching circuit 3 constituting the temperature setting means, the transistor Q ₁ , the relay and the relay contact r ₁ control the energization of the heating element H ₁ intermittently. Control heat generation temperature.

In addition, the temperature setting signal voltage of the switching circuit 3 is applied to the pest extermination circuit 6 which constitutes an insect killing means and a return means.
The insecticidal temperature level can be forcibly set by the output signal A of the counter 9. The pest extermination circuit 6 includes an insecticide setting switch 7, a flip-flop 8 for reversing the output on the operating surface of the insecticide setting switch 7, a counter 9 that is cleared by the output of the flip-flop 8, and a count clock for the counter 9. The counter 9 supplies a signal A for setting the above-mentioned insecticidal temperature level from the start of counting to the end of counting, and also generates a drive signal for a state clarifying circuit 11 which is a clarifying means for indicating the insecticidal operating state. B
is applied to the state clarifying circuit 11.

Next, the operation which is the main part of the present invention will be explained using the specific circuit shown in FIG.

First, the oscillation circuit 10 includes a PUT 15, a resistor R ₁₉ ,
Voltage divider circuit consisting of R ₂₀ , resistor R ₁₈ and capacitor
When the anode voltage exceeds the gate voltage, the PUT15 turns on, discharges the charge in the capacitor _C1 , and charges the capacitor _C1 again, thus charging _and discharging the capacitor _C1 . By repeating this, the clock ck shown in FIG. 3c is applied to the counter 9.

Here, the insecticide setting switch 7 is normally turned on without being pressed, so the flip-flop 8 is turned on.
The output Q of the counter 9 is "H", the counter 9 is in a clear state and does not count the clock ck, and the output Q of the counter 9 is "L". Therefore, since the output of the NOR gate 12 which inputs the output Q of the counter 9 and the output Q of the flip-flop 8 is "L", the transistor _Q3 of the state clarifying circuit 11 is in the OFF state and the transistor _Q3 is connected through the resistor _R17 . The light emitting diodes LED connected in series are off. Further, when the transistor _Q2 of the switching circuit 5 is also in an off state, the temperature setting signal voltage connected to the non-inverting terminal of the comparator CP1 of the switching circuit 5 becomes a voltage corresponding to the temperature set by the user through the variable resistor VR. Therefore, the detection signal voltage from the detection circuit 4 corresponding to the heat generation temperature of the heating element _H1 is compared with this temperature setting signal voltage by the comparator CP1, and when the detected temperature exceeds the set temperature, the comparator CP1
The output of transistor Q1 becomes "L", turning off transistor _Q1 , cutting off the excitation current of excitation coil _Ry of the relay, turning off relay contact r, and stopping energization to heating element _H1 . When the heating element _H1 falls and the detected temperature becomes below the set temperature, the output of the comparator CP1 becomes "H", the transistor _Q1 is turned on, and excitation current flows through the excitation coil _Ry , and the heating element _H1 energize. In this way, the heat generation temperature is maintained at the set temperature. Note that the resistors R ₁₁ , R ₁₂ and the resistor R ₁₀ are used together with the variable resistor VR to divide the power supply voltage V _cc in order to provide a temperature setting signal voltage to the comparator CP1. The resistor _R9 is a resistor for allowing the comparator CP1 to operate in hysteresis. The diode _D1 is a diode for absorbing the back electromotive force of the exciting coil _Ry .

Now, if the insecticide setting switch 7 is momentarily pressed as shown in FIG. 3a, the set terminal S of the flip-flop 8 becomes "L", and the flip-flop 8 is set. With this setting, the Q output of the flip-flop 8 becomes "L" as shown in FIG. 3b. Therefore, the clear state of the counter 9 is released and the counter 9 starts counting the clock ck, but until it counts up,
Output Q remains "L". NOR gate 12
Since the output Q of the flip-flop 8 becomes "L", it becomes "H" as shown in FIG. 3e. Therefore, the transistor _Q3 of the state indicating circuit 11 and the transistor _Q2 of the switching circuit 5 are turned on. Therefore, in the status indicating circuit 11, the light emitting diode LED lights up to clearly indicate that the insect killing operation is in progress. On the other hand, when the transistor Q ₂ is turned on, the variable resistor VR is short-circuited, and the temperature setting signal voltage is set to the voltage corresponding to the maximum temperature at which pests such as mites die, and the heating element H ₁ is forcibly turned on.
raise the exothermic temperature to the maximum temperature regardless of the previous set temperature. This state is the insecticidal operating state.

Now, counter 9 has a predetermined number of clocks.
When ck is counted up, the output Q becomes "H" as shown in FIG. 3d. As a result, the transistor _Q4 is turned on and the set terminal S of the flip-flop 8 is pulled to "L", thereby resetting the flip-flop 8. Therefore, the output Q of the flip-flop 8 is inverted to "H", the counter 9 is in the clear state, and the output Q of the counter 9 is "L".
becomes. Therefore transistor _Q4 is turned off and
The output of the NOR gate 12 becomes "L". The light emitting diode LED of the result status display circuit 11 turns off.
The end of the insecticidal operation is clearly indicated by turning off the light.
Further, by turning off the transistor _Q2 , the set temperature signal voltage returns to the state before the killing operation state, and normal heating is performed. In other words, the operation of the electric heating device of the present invention is restored.

Embodiment 2 This embodiment uses a state clarifying circuit 1 as shown in FIG.
The transistor Q ₃ of the switching circuit 5 is driven by the output Q ₁ of the counter 9, and the transistor Q ₂ of the switching circuit 5 is driven by the output Q ₁₃ of the counter 9. In other words, the counter 9 divides the frequency of the clock ck (for example, the period T is 500 msec) shown in Fig. 5c from the start of counting, and obtains a pulse with a period of 1 second, for example, at the output Q ₁ as shown in Fig. 5d. Further, as shown in FIG. 5e, the holding time of the insecticidal operation state is obtained from the output _Q13 , and the holding time is set to, for example, about 4000 seconds. When the counter 9 starts counting as described above, the transistor _Q3 of the status indicating circuit 11 repeatedly turns on and off at 1 second intervals to cause the light emitting diode LED to blink, thereby indicating the insecticidal operating status. 5a shows the input to the set terminal S of the flip-flop 8, b shows the Q output of the flip-flop 8, f shows the output of the NOR gate 12, and the output _Q13 of the counter 9 is the one in the embodiment. This corresponds to the output Q of the counter 9 of No. 1.

Embodiment 3 The state indicating circuit 11 in the above embodiments 1 and 2 clearly indicates the insecticidal operation state by lighting or blinking the light emitting diode LED, but in this embodiment, the output of the NOR gate 12 as shown in FIG. When inputted, the liquid crystal display device LCD is driven by a liquid crystal driver 14 to display a character 13 such as a tick. In this case, the state of the insecticidal operation may be clearly indicated by moving the character 13, and the state of the insecticidal operation may be clearly indicated by the stopped character 13 when the operation is finished. Note that this embodiment has the same configuration and operation as the circuit of the first embodiment except for the state clarifying circuit 11.

Embodiment 4 In all of the above embodiments 1, 2, and 3, the end is indicated visually by turning off the light emitting diode LED, or by extinguishing or stopping the character 13, but in this embodiment, In the circuit of Embodiment 2, an alarm circuit is added to the circuit of FIG. 4, which causes the buzzer 16 to sound when the insecticidal operation state ends using the output Q ₁₃ of the counter 9, and the transistor Q ₅ is a transistor for driving the buzzer.

The counter 9 is cleared when the flip-flop 8 is reset by operating the insecticide setting switch 7, and the counter ₉ stops counting when the output _Q13 becomes "H". This is done by turning on ₆ and stopping the clock ck input. Figure 8 a~
f shows the signal waveform of each part of this embodiment, and Fig. 5 a
Corresponds to ~f.

[Effects of the Invention] The present invention provides an electric heating device including a heating element, a temperature detecting means for detecting the temperature of the heating element, and a temperature setting means for setting the temperature of the heating element, which includes an insect killing switch. Since the insect killing means is provided for setting and maintaining the temperature of the heating element at the set insect killing temperature level for a predetermined time after the insect killing switch is turned on, regardless of the previous temperature level, simply by operating the insect killing setting switch, The heat generation temperature of the heating element used for heating can be set to the insecticidal temperature level regardless of the state before operation, so anyone can easily exterminate pests such as mites. Furthermore, the structure for killing insects is simple as it uses heating elements for heating, and furthermore, it includes a means for clearly indicating the insect killing operation state during the holding period, and a means for notifying the end of the holding period and setting the insect killing setting. Since it is equipped with a return means for returning the operating state to the state before the switch was turned on, it is possible to indicate to the user that the insecticidal operating state is in progress, and also to notify the user of the end of the insecticidal operating state. Since the normal heating operation is automatically resumed after the end of the insecticidal operation state, there is no need for troublesome switching, and furthermore, the high temperature setting of the insecticidal heating can be used for rapid heating.
Furthermore, since we have provided a clear means to clearly indicate that the heating device is in insect killing mode, the high temperature setting will be maintained while the heating device is in insect killing mode, regardless of the user's preferred temperature setting. Inadvertently touching the insecticide will cause a surprise due to the high temperature, so it is necessary to make the user aware that the insecticidal operation is in progress, and this clearing method will prevent this from happening. This has the effect that it is possible to easily distinguish whether or not the heating device is in the insecticidal operation.

[Brief explanation of drawings]

Fig. 1 is a circuit block of the first embodiment of the present invention, Fig. 2 is a specific circuit diagram of the main parts of the above, Fig. 3 is a waveform diagram of each part for explaining the operation of the above, and Fig. 4 is an implementation of the present invention. A specific circuit diagram of the main part of Example 2, FIG. 5 is a waveform diagram of each part for explaining the operation of the same as above, FIG. 6 is a specific circuit diagram of the main part of Example 3 of the present invention, and FIG. A specific circuit diagram of the main part of the fourth embodiment, and FIG. 8 is an explanatory diagram of the same operation. H ₁ ...heating element, 7...insecticide setting switch,
4...detection circuit, 5...switching circuit, 6...
. . . Pest extermination circuit, 11 . . . Status indication circuit.

Claims (1)

[Scope of Claims] 1. An electric heating device comprising a heating element, a temperature detection means for detecting the temperature of the heating element, and a temperature setting means for setting the temperature of the heating element, comprising an insecticide setting switch. insecticidal means for setting and maintaining the temperature of the heat generating element at a set insecticidal temperature level for a predetermined period of time after turning on the insecticidal setting switch, regardless of the previous temperature level; and clearing means for clearly indicating the insecticidal operating state during the holding period; An electric heating device characterized by comprising: a return means for notifying the end of the holding period and returning the operating state to the state before turning on the insecticide setting switch. 2. The electric heating device according to claim 1, wherein a circuit for blinking a light emitting diode is used as the indicating means. 3. The electric heating device according to claim 1, wherein a liquid crystal display that displays characters is used as the indicating means. 4. The electric heating device according to claim 1, wherein the end of the holding period is notified by a buzzer.