KR102064808B1 - Heating mat device having temperature controller - Google Patents

Abstract

The purpose of the present invention is to provide a thermal mat device with a temperature controller, which can simultaneously respond to total overheating and local overheating by using combined resistance values of a plurality of temperature sensors. According to the present invention, the thermal mat device with a temperature controller comprises: an AC/DC converter converting an input commercial AC voltage into a DC voltage of a predetermined level; a DC power supply unit for control which converts the commercial AC voltage into a DC voltage for control; a DC/DC converter which is controlled by a PWM signal to convert the DC voltage of the predetermined level into a thermal mat providing voltage; a controller which outputs a load control signal and a current temperature by comparing the detected temperature value detected from the thermal mat with an operation upper limit temperature stored therein; a PWM signal generating unit which controls and outputs a pulse width of a PWM signal by using the thermal mat providing voltage; and a load control unit controlled by the load control signal to switch the thermal mat providing voltage to the thermal mat. The thermal mat includes: a plurality of carbon wires arranged in parallel to receive the thermal mat providing voltage; at least one bimetal disposed in series on a load line coupled to the plurality of carbon wires; and a plurality of NTC elements disposed between the plurality of carbon wires, each NTC element being adjacent to a different carbon wire.

Description

HEATING MAT DEVICE HAVING TEMPERATURE CONTROLLER

The present invention relates to a thermal mat device, and more particularly to a thermal mat device having a temperature controller using a bridge type negative temperature coefficient (NTC) element.

In general, the mat is widely used in the general home, it is an article mainly used when laying on the floor, the user is lying on the top, resting or sleeping.

Such a mat is provided with a heating means for generating heat by receiving power therein, and heating the mat surface to a warm state while the heating wire therein is generated by a power applied from the outside has been proposed and widely used. It is used.

In Utility Model Registration No. 20-0350562 (name: heater wire wiring structure of a heat transfer mat), as described in the publication, a hot wire is drawn out from a connector divided into two sides, and the above hot wire is moved inward from both edges of the mat. By forming a zigzag shape and placing a bimetal and a temperature sensor between zigzag heating wires and connecting them to a power line drawn out from the connector, the use surface of the divided mat is not subjected to any thermal interference by the divided heating wires. Even though the temperature of the surface is maintained uniformly, the connector to which the power is applied is divided on both sides and has a symmetrical wiring structure in the center of the mat longitudinal direction. Heat transfer mat which was able to use regulator near side from use surface is listed, have.

Carbon thermal mat and its manufacturing method Thermal mat using DC power Thermal electric mat using carbon fiber heating wire Utility Model Registration No. 20-0350562 Heater wire wiring structure of heat transfer mat

Since the thermal mat independently detects the temperature only in the area where the temperature sensor is disposed, there is a limit in solving a problem such as an image due to overheating.

Accordingly, an object of the present invention is to provide a thermal mat device having a temperature controller capable of simultaneously responding to total overheating and local overheating by using a composite resistance value of a plurality of temperature sensors.

A thermal mat device having a temperature controller according to the present invention includes an AC / DC converter for converting an input commercial AC voltage into a DC voltage of a predetermined level; A control DC power supply for converting the commercial AC voltage into a control DC voltage; A DC / DC converter controlled by a PWM signal to convert the DC voltage of the predetermined level into a heating mat providing voltage; A controller for outputting a load interruption signal and a current temperature by comparing the detected temperature value detected from the thermal mat with an operating upper limit temperature stored therein; A PWM signal generator for controlling and outputting a pulse width of a PWM signal using the thermal mat providing voltage; And a load control unit controlled by the load control signal to switch the thermal mat providing voltage to the thermal mat, wherein the thermal mat includes: a plurality of carbon wires arranged in parallel to receive the thermal mat providing voltage; At least one bimetal disposed in series on a load line coupled to the plurality of carbon wires; And a plurality of NTC elements disposed between the plurality of carbon wires, each NTC element disposed adjacent to different carbon wires.

Preferably, the plurality of NTC elements are even and may be arranged to be evenly distributed on the thermal mat.

Preferably, in the plurality of NTC elements, the first NTC element 531 and the second NTC element 532 are connected in series, and the third NTC element 533 and the fourth NTC element 534 are in series, respectively. The third NTC element 533 and the fourth NTC element 534 connected in series with the first NTC element 531 and the second NTC element 532 connected in series may be connected in parallel with each other.

Preferably, the controller may store the upper limit operating temperature dependent on the set temperature of the thermal mat set from the outside.

Preferably, the upper limit operating temperature depending on the set temperature of the thermal mat is about 4 to 7 degrees higher than the set temperature.

Preferably, the controller cuts off the load interruption signal when the combined resistance value of the plurality of NTC elements exceeds a predetermined range in a state in which a load current starts to flow in the thermal mat, and the combined resistance value is 0 or If it is infinity, the load interruption signal may be blocked.

Preferably, when the controller outputs a current temperature value, the display for outputting the current temperature value; And an alarm unit that alerts the controller when the controller outputs an alarm control signal.

According to the thermal mat device having the temperature controller of the present invention, it is possible to prevent the thermal mat from overheating as a whole and to prevent local overheating.

1 is an overall block diagram of a thermal mat device having a temperature controller according to an embodiment of the present invention;
2 is a detailed circuit diagram of an AC / DC converter according to an embodiment of the present invention;
3 is a detailed circuit diagram of a control DC power supply unit according to an embodiment of the present invention;
4 is a detailed circuit diagram of a DC / DC converter and a PWM signal generator according to an embodiment of the present invention;
5 is a thermal mat configuration in which the NTC device is disposed according to an embodiment of the present invention,
6 is an equivalent circuit diagram of an NTC device according to an embodiment of the present invention;
7 is a conceptual diagram of an input / output signal of a controller according to an embodiment of the present invention, and
8 is an exemplary diagram of a temperature table of an NTC device.

Further objects, features and advantages of the present invention can be more clearly understood from the following detailed description and the accompanying drawings.

Prior to the detailed description of the present invention, the present invention may be variously modified and may have various embodiments, and the examples described below and illustrated in the drawings are intended to limit the present invention to specific embodiments. It is to be understood that the present invention includes all modifications, equivalents, and substitutes included in the spirit and technical scope of the present invention.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when a component is said to be "directly connected" or "directly connected" to another component, it should be understood that there is no other component in between.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to indicate that there is a feature, number, step, action, component, part, or combination thereof described on the specification, and one or more other features. It is to be understood that the present disclosure does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or combinations thereof.

In addition, the terms "... unit", "... unit", "... module", and the like described in the specification mean a unit for processing at least one function or operation, which means hardware or software or hardware and It can be implemented in a combination of software.

In addition, in the description with reference to the accompanying drawings, the same components regardless of reference numerals will be given the same reference numerals and duplicate description thereof will be omitted. In the following description of the present invention, if it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

1 is an overall block diagram of a thermal mat device with a temperature controller according to an embodiment of the present invention.

Thermal mat device having a temperature controller according to an embodiment of the present invention, the AC / DC converter 110, the control DC power supply 120, DC / DC converter 130, the thermal mat 140, the controller 150 , A PWM signal generator 160, a display 170, a load controller 180, and an alarm 190.

The AC / DC converter 110 converts an input commercial AC voltage Vac into a DC voltage Vdc of a predetermined level. For example, the AC / DC converter 110 may receive an AC voltage Vac of 220 volts and convert it into a DC voltage Vdc of 300 volts.

The control DC power supply unit 120 converts an input commercial AC voltage Vac into a control DC voltage Vcon. For example, the control DC power supply unit 120 may receive an AC voltage Vac of 220 volts and convert the DC voltage Vcon of 24 volts.

The DC / DC converter 130 is controlled by the PWM signal Spwm output from the PWM signal generator 160 to heat the DC voltage Vdc of a predetermined level output from the AC / DC converter 110. It converts into a heated mat-provided voltage (Vheat) that can be applied to my carbon wire.

The controller 150 may control the load interruption signal Pout, the current temperature Tcurrent, and the alarm control signal Salarm in response to a set temperature Tset applied from the outside and a detection temperature Tsense detected from the thermal mat 140. Outputs

The PWM signal generator 160 uses the thermal mat providing voltage Vheat output from the DC / DC converter 130 to adjust the pulse width of the PWM signal Spwm provided to the switching element in the DC / DC converter 130. By controlling and outputting, the heating mat providing voltage Vheat output from the DC / DC converter 130 is controlled to stay within a predetermined range.

The display 170 displays the current temperature Tcurrent output from the controller 150.

The load control unit 180 is controlled by the load control signal Pout output from the controller 150 to switch the heating mat providing voltage Vheat provided from the DC / DC converter 130 to the heating mat 140.

The alarm unit 190 is controlled by an alarm control signal Salarm output from the controller 150 to alarm the abnormality of the thermal mat 140.

2 is a detailed circuit diagram of an AC / DC converter according to an embodiment of the present invention.

The AC / DC converter 110 according to an embodiment of the present invention converts the commercial AC voltage Vac input to a DC voltage Vdc of a predetermined level.

The AC / DC converter 110 includes a surge absorption element TNR for absorbing a surge voltage included in an input side. For example, the surge absorption element TNR may be a varistor.

In addition, the AC / DC converter 110 sequentially couples two balancing transformers L1 and L2 across the power line, and capacitors C21, C22 and C23 before and after the two balancing transformers and between the two balancing transformers, respectively. ) To filter out noise in large and diverse frequency bands. Each of the balancing transformers L1 and L2 is inserted to interact with both ends of the power line to match the impedance between both ends.

3 is a detailed circuit diagram of a control DC power supply unit according to an embodiment of the present invention.

The control DC power supply unit 120 according to an embodiment of the present invention converts an input commercial AC voltage Vac into a control DC voltage Vcon.

The control DC power supply unit 120 includes bridge diodes D31, D32, D33, and D34 for full-wave rectification of the commercial AC voltage Vac input through the surge absorption element TNR, and the bridge diodes D31, D32, and D33. And a Zener diode ZD31 capable of providing a predetermined level of constant voltage at the rear end of the circuit, and a constant voltage IC U1 receiving a predetermined level of constant voltage and outputting a control constant voltage Vcc.

4 is a detailed circuit diagram of a DC / DC converter and a PWM signal generator according to an embodiment of the present invention. The DC / DC converter 130 is controlled by the PWM signal Spwm output from the PWM signal generator 160. The heating mat providing voltage Vheat, which may apply a predetermined level of the DC voltage Vdc output from the AC / DC converter 110 to the carbon wire in the heating mat 140, is converted.

The PWM signal generator 160 receives the thermal mat providing voltage Vheat applied to the output terminal of the DC / DC converter 130 and provides the thermal mat when the heating mat providing voltage Vheat is higher than the predetermined reference voltage Vref. Voltage control IC (U2) for lowering the voltage (Vheat) and generating a voltage control signal for raising the thermal mat providing voltage (Vheat) when the thermal mat providing voltage (Vheat) is lower than the predetermined reference voltage (Vref). And a PWM IC U3 alternately generating the first and second PWM signals Spwm1 and Spwm2 whose pulse widths are adjusted in response to the voltage control signal. That is, the seventh terminal of the PWM IC U3 outputs the first PWM signal Spwm1, and the eighth terminal of the PWM IC U3 outputs the second PWM signal Spwm2.

The DC / DC converter 130 is controlled by the first and second PWM signals Spwm1 and Spwm2 to alternately switch the first and second transformer primary side switching elements Q41 and Q42, the transformer T41 and the transformer. (T41) includes rectifiers D43 and D44 disposed on the secondary side to rectify the output voltage of the transformer T41.

The PWM signal generator 160 receives a feedback of the heating mat providing voltage Vheat by using the divided voltages of the divided resistors R54 and R55 disposed at the output terminal of the DC / DC converter 130.

FIG. 5 is a diagram illustrating a thermal mat in which an NTC device is disposed, and FIG. 6 is an equivalent circuit diagram of an NTC device according to an embodiment of the present invention.

The thermal mat 140 in which the NTC element is disposed according to an embodiment of the present invention is coupled to a plurality of carbon wires 510 and a plurality of carbon wires 510 arranged in parallel to receive a heat mat providing voltage Vheat. A plurality of bimetals (B1, B2) and a plurality of carbon wires 510 disposed in series with the load line to be disposed, each NTC element is a plurality of NTC disposed adjacent to the different carbon wire 510 Elements 531, 532, 533, 534.

According to the exemplary embodiment of the present invention, the plurality of NTC elements 531, 532, 533, and 534 are respectively connected in series with the first NTC element 531 and the second NTC element 532, and the third NTC element 533. ) And the fourth NTC element 534 are connected in series, respectively, and the third NTC element 533 and the fourth NTC element 534 connected in series with the first NTC element 531 and the second NTC element 532 connected in series. Are connected in parallel to each other. Here, the NTC element is a negative temperature coefficient element as shown in the temperature table of the NTC element (25 degrees, 10 kilo ohms) of FIG. 8, and has a characteristic in that the resistance value decreases as the temperature rises.

In addition, the four NTC elements 531, 532, 533, and 534 may be arranged to detect the heating temperature of the heating mat 140 by dividing the heating mat 140 into four portions.

In this case, the plurality of NTC elements 531, 532, 533, and 534 may be equivalent to the combined resistance as shown in FIG. 6, and the combined resistance value R total is expressed by Equation 1 below.

Although not shown, according to another embodiment of the present invention, two NTC elements disposed adjacent to different carbon wires may be connected in parallel.

In addition, according to another embodiment of the present invention, it is natural that more than six excellent NTC elements can be connected in parallel.

7 is a conceptual diagram of an input / output signal of a controller according to an embodiment of the present invention.

The controller 150 according to an embodiment of the present invention responds to the load interruption signal Pout and the current temperature in response to a set temperature value Tset applied from the outside and a detection temperature value Tsense detected from the thermal mat 140. Outputs the value (Tcurrent) and alarm control signal (Salarm).

Even if the thermal mat 140 locally generates abnormal abnormal heat, the controller 150 may operate at a predetermined temperature higher than the set temperature Tset set by the plurality of NTC elements. When staying below), the load control signal Pout is output to operate the thermal mat 140 normally. For example, when the set temperature is 45 degrees, the upper limit operating temperature of the combined resistance value is 52 degrees (Tstop1), and when the set temperature is 55 degrees, the upper limit operating temperature of the combined resistance value is 61 degrees (Tstop2) and the set temperature is 65 degrees. In the case of degrees, the upper limit operation temperature of the combined resistance value is set to 70 degrees (Tstop3) and stored. When the detected temperature value Tsense of the combined resistance value exceeds the upper limit operating temperature of the combined resistance value, the controller 150 interrupts the load. The signal Pout may be blocked. According to an embodiment of the present invention, the controller 150 may include a storage capable of storing an upper limit operating temperature, that is, an upper limit operating temperature storage unit (not shown).

In general, the setting temperature of the thermal mat is about 45 degrees in the spring and autumn, about 55 degrees in the early winter, about 65 degrees in the middle of winter, and about 75 degrees in the middle of winter. In addition, the burn risk temperature is 90 degrees in adults, while the burn risk temperature is 80 degrees in infants.

The following is an example of local overheating by set temperature.

i) When the thermal mat 140 is set to 45 degrees

If the region where the first NTC element 531 is disposed is locally overheated at 90 degrees, referring to FIG. 8, the resistance value Rntc1 of the first NTC element is 0.916 kiloohms, and the second to fourth NTC elements Since the resistance values of (532, 533, 534) are 4.365 kilo ohms, the synthetic resistance value R total is as follows.

Synthetic resistance value (Rtotal) 3.290 kilo ohms is a value corresponding to a temperature range exceeding the upper limit operating temperature of 52 degrees, the controller 150 blocks the load interruption signal (Pout) to provide a thermal mat to the thermal mat 140 The load current is cut off because no voltage is applied. Accordingly, it can be seen that the local heat generation, which is the main cause of the fire or burn, that is, the higher the heat storage temperature, the more sensitively the heat is blocked.

ii) When the thermal mat 140 is set at 55 degrees

If the region where the first NTC element 531 is disposed is locally overheated at 90 degrees, the resistance value Rntc1 of the first NTC element is 0.916 kiloohms, and the second to fourth NTC elements 532, 533, 534 Since the resistance value is 2.984 kilo ohms, the synthetic resistance value (R total) is as follows.

Synthetic resistance (Rtotal) 2.349 kilo ohms is a value corresponding to the temperature range exceeding the upper limit of 61 degrees operating temperature, the controller 150 blocks the load interruption signal (Pout) to provide a thermal mat to the thermal mat 140 The load current is cut off because no voltage is applied. Accordingly, it can be seen that the local heat generation, which is the main cause of the fire or burn, that is, the higher the heat storage temperature, the more sensitively the heat is blocked.

iii) when the thermal mat 140 is set at 65 degrees

If the region where the first NTC element 531 is disposed is locally overheated at 90 degrees, the resistance value Rntc1 of the first NTC element is 0.916 kiloohms, and the second to fourth NTC elements 532, 533, 534 Since the resistance value is 2.082 kilo ohms, the synthetic resistance value R total is as follows.

Since the composite resistance value (Rtotal) 1.733 kiloohm is a value corresponding to a temperature range exceeding an upper limit of operation temperature of 70 degrees, the controller 150 blocks the load interruption signal Pout to provide a thermal mat to the thermal mat 140. The load current is cut off because no voltage is applied. Accordingly, it can be seen that the local heat generation, which is the main cause of the fire or burn, that is, the higher the heat storage temperature, the more sensitively the heat is blocked.

On the other hand, the controller 150 blocks the load interruption signal Pout when the combined resistance is greater than 10 kiloohms. That is, when the first or second NTC elements 531 and 532 are disconnected or the third or fourth NTC elements 533 and 534 are disconnected while the load current starts to flow to the thermal mat 140, the composite resistor The value is 20 kilo ohms, so cut off the load interruption signal (Pout).

The controller 150 blocks the load interruption signal Pout when the synthesized resistance value is 0 or infinity. That is, when the first to fourth NTC elements 531, 532, 533, and 534 are shorted, the synthesized resistance value is 0, so that the controller 150 blocks the load interruption signal Pout. In addition, when the first to fourth NTC elements 531, 532, 533, and 534 are disconnected, the synthesized resistance value is infinite, and thus the controller 150 blocks the load interruption signal Pout.

In addition, the plurality of bimetals B1 and B2 are disposed in series with a load line coupled to the plurality of carbon wires 510. When the carbon wires 510 rise above 90 degrees, the bimetal is operated to heat the mat 140. Shut off the load current flowing through).

When the controller 150 outputs the current temperature value Tcurrent, the display 170 displays this, and when the thermal mat 140 is overheated, an alarm control signal Salarm is output to indicate an abnormality to the alarm unit 190. do.

The embodiments and the accompanying drawings described herein are merely illustrative of some of the technical ideas included in the present invention. Therefore, since the embodiments disclosed herein are not intended to limit the technical spirit of the present invention, but to explain, it is obvious that the scope of the technical spirit of the present invention is not limited by these embodiments. Modifications and specific embodiments that can be easily inferred by those skilled in the art within the scope of the technical idea included in the specification and drawings of the present invention should be construed as being included in the scope of the present invention.

110: AC / DC converter
120: control DC power supply
130: DC / DC converter
140: thermal mat
150: controller
160: PWM signal generator
170: display
180: load interruption
190: alarm unit

Claims (7)

An AC / DC converter for converting an input commercial AC voltage into a DC voltage of a predetermined level; A control DC power supply for converting the commercial AC voltage into a control DC voltage; A DC / DC converter controlled by a PWM signal to convert the DC voltage of the predetermined level into a heating mat providing voltage; A controller for outputting a load interruption signal and a current temperature by comparing the detected temperature value detected from the thermal mat with an operating upper limit temperature stored therein; A PWM signal generator for controlling and outputting a pulse width of a PWM signal using the thermal mat providing voltage; And a load control unit controlled by the load control signal to switch the thermal mat providing voltage to the thermal mat.
The thermal mat may include a plurality of carbon wires arranged in parallel to receive the thermal mat providing voltage; At least one bimetal disposed in series on a load line coupled to the plurality of carbon wires; And a plurality of NTC elements disposed between the plurality of carbon wires, each NTC element disposed adjacent to different carbon wires.
The plurality of NTC elements are even numbers, arranged to be evenly distributed on the thermal mat,
In the plurality of NTC elements, the first NTC element 531 and the second NTC element 532 are connected in series, and the third NTC element 533 and the fourth NTC element 534 are connected in series, respectively. The first NTC element 531 and the third NTC element 533 and the fourth NTC element 534 connected in series with the second NTC element 532 are connected in parallel with each other.
Warm mat device with temperature controller.
delete delete The method according to claim 1,
And the controller stores an upper limit operation temperature dependent on a set temperature of the thermal mat set externally.
The method according to claim 4,
And an upper limit operating temperature dependent on the set temperature of the heated mat is about 4 to 7 degrees higher than the set temperature.
The method according to claim 1, wherein the controller,
If the combined resistance value of the plurality of NTC elements exceeds a predetermined range in the state that the load current starts to flow to the thermal mat, the load interruption signal is cut off,
And the load interruption signal is cut off when the synthesized resistance value is 0 or infinity.
The method according to claim 6,
A display for outputting the current temperature value when the controller outputs the current temperature value; And
An alarm unit which alarms when the controller outputs an alarm control signal
Thermal mat device having a temperature controller further comprising.

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