JPS62172117A - Heating apparatus - Google Patents

Abstract

PURPOSE:To obtain a heating apparatus which can change heating capacity in accordance with the change in room temperature, by providing a heating unit which has higher and lower heating capacities, by detecting a room temperature, by selecting a heater of higher heating capacity when a room temperature is lower than a predetermined room temperature, and by switching the heater to that of lower heating capacity when a room temperature is higher than the predetermined room temperature. CONSTITUTION:When a power source switch SW is turned on, the contact point of a relay Ry1 is opened or closed in accordance with the rise of temperature which is transmitted by the voltage produced between sensor electrodes S1 and S2, being rectified and being smoothed by a checking circuit 4. Current to be fed to a heater H1 or H2 is controlled and it works to keep a heater unit 2 at a predetermined temperature. A room-temperature setting temperature is compared with the actual room temperature by a room-temperature decision circuit 6. A signal is not output when a room temperature is lower than the room-temperature setting temperature. A transistor Q2 is turned OFF and a relay Ry2 is not actuated, and higher heating capacity H1 is selected for the heater. When a room temperature is high, a high level signal is output from a room-temperature decision circuit 6, and lower heating capacity H2 is selected for the heater.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Point W) The present invention relates to a heating device for an electric carpet or the like, which has a plurality of heaters and controls the temperature by switching the heating capacity.

(Background technology) For heating devices such as electric carpets, heaters with high and low heat generation capacities are installed to quickly warm up when started, to prevent overheating during normal use, and to save energy. There are some that allow you to select one heater or the other.

However, in conventional devices of this type, switching of the heating capacity (watt switching) of the heater is currently done with a manual switch. The realization of the device was awaited.

(Objective of the Invention) The present invention was proposed in view of the above points, and it increases the heating capacity by performing high-power heating when the room temperature is low, and increases the heating capacity by performing low-power heating when the room temperature is high. It is an object of the present invention to provide a heating device that can switch the heat generation capacity according to changes in room temperature, and can prevent the above.

(Disclosure of the Invention) That is, in the present invention, heaters having high and low heat generation capacities are provided, the room temperature is detected, and when the room temperature is below a predetermined room temperature setting temperature, a heater with a large heat generation capacity is selected, The above objective is achieved by switching to a heater with a smaller heat generation capacity when the room temperature is higher than the set temperature.

Hereinafter, the present invention will be described in detail with reference to the drawings showing examples.

FIG. 1 shows an embodiment corresponding to claim 1. In the figure, the commercial power supply 1 is connected to the first heater H1 or the second heater H2 of the heating element 2 through the power switch SW and then through the contacts of the first relay Ry and the contacts of the second relay RV2. connected to form a closed circuit. Note that the first heater H is a heater with a high heat generation capacity, and the second heater H2 is a heater with a low heat generation capacity. Further, the commercial power supply 1 includes a power switch SW.
The primary winding of the mm transformer T is connected through the It is connected to the input terminal of the Ti source circuit 3.

On the other hand, the heating element 2 has sensor electrodes iS1°S2 that are close to each other over almost the entire surface where the heaters H, , H2 are arranged, and there is a temperature sensitive material such as a plastic semiconductor between these sensor electrodes S1 and S2. In contrast, a heat-sensitive material having a negative characteristic impedance is provided. One sensor electrode S1 is supplied with a step-down AC signal from the secondary winding of the power transformer T via a resistor R4, and the other sensor electrode S2 is connected to the control circuit ground.

Next, the voltage generated between the sensor electrodes S, S2 is input to the detection circuit 4, and this voltage is rectified and smoothed at the detection port #I4 to produce a signal (temperature detection) that changes depending on the temperature. signal) and the subsequent switching circuit 5
It is now entered into The switching circuit 5 compares the input temperature detection signal and the temperature setting signal and outputs a low level or high level signal, and the output of the switching circuit 5 causes the transistor Q to
, to operate relay RV.

On the other hand, the output of the room temperature determination circuit 6 is connected to the base of a transistor Q2 via a resistor R, and by turning on this transistor Q, a relay Ry2 connected to the collector path is driven. In addition, relay Ry
The normally closed contact NC of the second contact is connected to the heater H (high heat generation capacity ik), and the normally open contact NO is connected to the heater H (low heat generation capacity).

In operation, when the power switch SW is turned on, the sensor voltage llm5. ．． 82 is rectified and smoothed by the detection circuit 4, and the temperature detection signal, which has the property of decreasing in accordance with the temperature rise, is compared with the temperature setting signal of the switching circuit 5, and depending on the magnitude, relay RV1 is The contact is on.
The power supply to the heaters H, H2 is controlled to maintain the heating element 2 at a predetermined temperature.

On the other hand, the room temperature determination circuit 6 compares the predetermined room temperature setting and the actual room 1, and when the room temperature is lower than the room temperature setting, no signal is output, transistor Q2 is turned off, and relay RV2 does not operate. , H as a heater (high heat generation capacity)
is selected. Also, when the room temperature is higher than the set temperature, a high level signal is output from the room temperature discrimination circuit 6 and the relay Ry
is turned on, and H2 (low heat generation capacity) is selected as the heater.

Figure 2 shows the temperature T of the heating element 2 and the chamber m with respect to the elapsed time t.
It shows the change in T, and the room temperature setting is
(for example, 18° C.), and the room temperature T6 at the time of starting is lower than To. Therefore, from the time of startup until the room temperature T8 reaches the room temperature set temperature T0, the heater H with a high heat generation capacity is used.
Heating is performed by 1, and the room ATR reaches the set room temperature T0.
When the temperature exceeds that level, the heater H2 with a lower heat generation capacity is used. After that, due to changes in the outside air, etc., the room temperature TFL becomes the room temperature set temperature T. When the patient falls under breath, the heater H1 with a high heat generation capacity is switched again.

FIG. 3 shows an example of the circuit configuration of the room temperature determination port g86 in FIG. 1, and includes a DC power supply V. A series circuit of resistors R4 and R5 and a series circuit of resistor R6 and negative characteristic thermistor NTC are connected between C and ground, and the connecting point of resistors R, R5 and the connecting point of resistor R6 and negative characteristic thermistor NTC are connected to comparator CP2. They are connected to a non-inverting input terminal and an inverting input terminal, respectively. Here, resistance R4
, the voltage at the connection point of R5 corresponds to the room temperature setting when the heating capacity of the heater is switched, and the voltage V- at the connection point of the resistor R6 and the negative characteristic thermistor NTC corresponds to the room temperature. It changes depending on the situation.

Further, a resistor R7 is connected between the non-inverting input terminal of the comparator CP2 and its own output terminal in order to provide an appropriate bisteresis for comparison.

In operation, the resistance value of the negative characteristic thermistor NTC changes in response to changes in room temperature, and the voltage V- at the connection point between the resistor R6 connected to the inverting input terminal of the comparator CP and the negative characteristic thermistor NTC changes as the temperature rises. It will decrease with time.

Therefore, when the room temperature is low, the voltage ■- applied to the inverting input terminal of comparator CP2 becomes the voltage V applied to the non-inverting input terminal of comparator CP2, =R, xVoc/(R4
+R5), that is, in the case of V or V-, the output of comparator CP2 is low level, relay Ry2 remains off, and Hl (high heat generating capacity) is connected to the heater. In addition, when the room temperature rises and the resistance value of the negative characteristic thermistor NTC decreases and becomes ■ or > ■ -, the output of the comparator CP becomes high level, and the relay Ry
2 is activated, and the heater is switched to H2 (low heat generation capacity).

Next, FIG. 4 shows an embodiment corresponding to claim 2. In this embodiment, in order to further accelerate the rise in temperature at the time of starting, the room temperature is low at the time of starting, and the power is increased. The temperature control setting value is set high during the heating period.

Therefore, the configuration is such that the output of the room temperature discrimination circuit 6 is transmitted to the driving part of the relay Ry2, and the comparator CP of the switching circuit 5 which is involved in temperature control via the resistor R9.
, is connected to the inverting input terminal of . Note that the heater temperature setting signal set by the variable resistor VR1 is applied to the inverting input terminal of the comparator cP1, and the temperature detection signal output from the detection circuit 4 is input to the non-inverting input terminal. .

In operation, the comparator C of the switching circuit 5
The heater temperature detection signal input to the non-inverting input terminal of P has a negative characteristic that its voltage decreases as the temperature rises, while the voltage input to the inverting input terminal is input to the variable resistor VR.
, is adjusted according to the heater control set temperature, and both are compared by a comparator CP1. However, the inverting input terminal of the comparator CP1 is connected to the room temperature determination port #! through a resistor R9. Since the output of 6 is applied, a low level signal is applied to the inverting input terminal of the comparator CP through the resistor R9 when the room temperature is low (when the heater is switched to the high heat generation capacity side). When the heater control set temperature is raised, and conversely, when the room temperature is high and the heater is switched to the low heat generation capacity side, the comparator CP1
A high level signal is applied to the 0 inversion input terminal via the resistor R9, and the heater control set temperature is lowered. In other words, when the room temperature is low and the heater heat generation capacity is large, the heater temperature is controlled to a high temperature, and when the room temperature is high, the heat generation becomes small overnight and the heater temperature is controlled to a low temperature. .

FIG. 5 shows the changes in the temperature T8 of the heating element 2 and the room temperature T II with respect to the elapsed time t in the above embodiment, where To is the room temperature set temperature, T1 is the heater control set temperature at high heat generation capacity, T2 is the heater control set temperature when the heat generation capacity is low.

Next, FIG. 6 1 shows an embodiment corresponding to item 3 of the claims, and in this embodiment, the room temperature setting at which the heat generation capacity is switched can be set arbitrarily by the user. I'm trying to do what I can. As a tS configuration (Yo, in the room temperature discrimination circuit 6, connect a series circuit of resistor R4j variable resistor VR2° and resistor R5 between DC power supply ■0 and ground, and connect the variable resistor VR2's RJ terminal to comparator CP2 via resistor R9. I am trying to input it to the non-inverting input terminal of .

In operation, when the movable terminal of the variable resistor vR2 is on the resistor R4 side, the voltage applied to the non-inverting input terminal of the comparator CP2 becomes high, and conversely, when the movable terminal of the variable resistor vR2 is on the resistor R5 side, the voltage applied to the non-inverting input terminal of the comparator CP2 increases. Voltage V applied to the non-inverting input terminal
+ is lowered, and the room temperature setting can be set to an appropriate value by adjusting the variable resistor VR2. Tip 9: When the WB terminal of the variable resistor R2 becomes the resistor R4 side, the room temperature setting becomes a low value, and Tanabata's heating capacity is switched between high and low at the low room temperature. Further, when the movable terminal of the variable resistor vR2 is on the side of the resistor R5, the set room temperature becomes a high value, and the heat generating capacity of the beater is switched between high and low at the high room temperature.

Next, FIG. 7 shows an embodiment corresponding to item 4 of the claims, in which the heat generating capacity is increased or decreased in response to the user increasing or decreasing the heater control set temperature of the temperature control circuit. The room temperature setting is changed when switching is performed.

As for the configuration, a voltage corresponding to the heater control set temperature, which is adjusted by variable resistor VR1 of switching circuit 5, is applied to resistor R.
16 to the non-inverting input terminal of the comparator CP2 of the room temperature determination circuit 6.

Therefore, when the user wants to lower the heater temperature, the movable terminal of the variable resistor VR is selected to the resistor R1° side, and when the user wants to raise the heater temperature, the movable terminal of the variable resistor VR is selected to the resistor R11 side. comparator C
By applying the voltage at the inverting input terminal of P, via the resistor R16 to the non-inverting input terminal of the room temperature setting comparator CP2 of the room temperature determination circuit 6, the room temperature set temperature is made to correspond to the amount of change in the heater control set temperature. and change. In other words, when the heater control setting temperature is selected low, the comparator CP2
The voltage V+ at the non-inverting input terminal of comparator CP2 becomes a high voltage, and the room temperature set temperature becomes low. Also, when the heater control setting temperature is selected high, the voltage V+ at the non-inverting input terminal of comparator CP2 becomes a low voltage. Therefore, the room temperature setting will also be high.

(Effects of the Invention) As described above, the present invention provides a heating device having a plurality of heaters and selectively switching these heaters to have at least two types of different heat generation capacities. Since the heater heat generation capacity is automatically switched depending on the ambient temperature conditions, convenient and comfortable heating can be achieved.

In addition, by changing the heater control set temperature according to the size of the heater heat generation capacity, rapid heating can be achieved when the room temperature is low, and overheating can be prevented when the room temperature is high, increasing comfort. can be further improved.

[Brief explanation of drawings]

Fig. 1 is a circuit configuration diagram showing one embodiment of the heating device of the present invention, Fig. 2 is an explanatory diagram of its operation, Fig. 3 is an example of the configuration of the room temperature discrimination circuit in Fig. 1, and Fig. 4 is another embodiment. A circuit configuration diagram showing the main part of the example, FIG. 5 is an explanatory diagram of its operation, FIG. 6 is a circuit diagram showing the main part of another embodiment, and FIG. 7 is a circuit diagram showing the main part of another embodiment. FIG. 1... commercial power supply, 2... heating element, 3... power supply circuit, 4... detection circuit, 5... switching circuit, 6... room temperature discrimination circuit patent application Person: Matsushita Electric Works Co., Ltd., agent for 5 companies, patent attorney Satoshi Takayama, and 1 other person

Claims (4)

[Claims] (1) In a heating device that detects the temperature of a heater and controls the amount of electricity to the heater by comparing it with a predetermined heater control set temperature, when the room temperature is detected and the temperature is below the predetermined room temperature set temperature, the A heating device comprising a room temperature determination circuit that switches the heat generation capacity of the heater to a high capacity and automatically switches the heat generation capacity of the heater to a low capacity when the room temperature is higher than a set room temperature. (2) The heater control set temperature when the heat generating capacity is selected as high capacity is set higher than the heater control set temperature when the heat generating capacity is selected as low capacity. The heating device according to item 1. (3) The heating device according to claim 1, wherein the room temperature setting can be arbitrarily set. (4) The heating device according to claim 1, wherein the room temperature setting is changed in response to the heater control setting temperature of a temperature control circuit that adjusts the temperature of the heater.