WO2004056155A1 - Electric heating system using low voltage - Google Patents

Electric heating system using low voltage Download PDF

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Publication number
WO2004056155A1
WO2004056155A1 PCT/KR2003/002750 KR0302750W WO2004056155A1 WO 2004056155 A1 WO2004056155 A1 WO 2004056155A1 KR 0302750 W KR0302750 W KR 0302750W WO 2004056155 A1 WO2004056155 A1 WO 2004056155A1
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WO
WIPO (PCT)
Prior art keywords
voltage
electrically connected
comparator
heater
point
Prior art date
Application number
PCT/KR2003/002750
Other languages
French (fr)
Inventor
Yong Woo Lee
Original Assignee
Yong Woo Lee
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Yong Woo Lee filed Critical Yong Woo Lee
Priority to AU2003286950A priority Critical patent/AU2003286950A1/en
Publication of WO2004056155A1 publication Critical patent/WO2004056155A1/en

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Classifications

    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B1/00—Details of electric heating devices
    • H05B1/02—Automatic switching arrangements specially adapted to apparatus ; Control of heating devices
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D23/00—Control of temperature
    • G05D23/19—Control of temperature characterised by the use of electric means
    • G05D23/1906—Control of temperature characterised by the use of electric means using an analogue comparing device
    • G05D23/1909—Control of temperature characterised by the use of electric means using an analogue comparing device whose output amplitude can only take two discrete values
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B3/00—Ohmic-resistance heating
    • H05B3/20—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater
    • H05B3/34—Heating elements having extended surface area substantially in a two-dimensional plane, e.g. plate-heater flexible, e.g. heating nets or webs
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/026—Heaters specially adapted for floor heating
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/035—Electrical circuits used in resistive heating apparatus
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B2203/00—Aspects relating to Ohmic resistive heating covered by group H05B3/00
    • H05B2203/036—Heaters specially adapted for garment heating

Definitions

  • the present invention relates to an electric heating system using a low voltage, and more particularly, to an electric heating system which generates heat at a voltage not more than 30V.
  • a reference numeral 8 denotes a sensor which can detect the heater 4 and a heated temperature of the heater 4.
  • a reference numeral 20 denotes a temperature setter which is connected to the temperature controller 6 and controls the temperature controller 6 which controls a turn-on state and a turn-off state of the current to be applied to the heater 4, considering a value obtained by manipulating the temperature controller 6 and a value detected by the temperature sensor 8.
  • the conventional heating system since the conventional heating system has a structure of supplying a commercial voltage of 110V/220V to the heater and performs the temperature control of the heater, users may run a risk of an electric leakage and shock accident.
  • an object of the present invention to provide an electric heating system using a low voltage by employing a perfectly insulated and inductively coupled transformer, in which a secondary voltage of the transformer is supplied to a heater as a low voltage of 30V or less and thus an electric leakage and shock accident does not happen.
  • an electric heating system using a low voltage comprising: a mat (M) having a heater (4) and a sensor (8) ; and a temperature controller (Tc) which is electrically connected to the heater (4) in the mat (M) , wherein the temperature controller (Tc) comprises: a power switch (sw) which is electrically connected to a power source (2) of 110V/220V; a power connection indicator (10) which is electrically connected to the power switch (sw) ; a direct-current (DC) converter (12) which converts an alternating-current (AC) voltage applied to the power connection indicator (10) into a DC voltage; a 12V constant voltage generator (14) which is electrically connected to the DC converter (12) and maintains and outputs the DC voltage output from the DC converter (12) as a stable voltage of 12V; a comparator (16) which is electrically connected to the 12V constant voltage generator (14) so that the 12V voltage supplied from the 12V constant voltage
  • FIG. 1 is a schematic block diagram showing a configuration of a conventional electric heating system
  • FIG. 2 is a schematic block diagram showing a configuration of an electric heating system according to the present invention.
  • FIG.3 is a detailed circuit diagram showing an electric heating system according " to the present invention.
  • an electric heating system using a low voltage includes a mat (M) having a heater 4 and a sensor 8, and a temperature controller (Tc) which is electrically connected to the heater 4 in the mat (M) , in which controlled current is supplied to the heater 4 to thus allow the heater 4 to perform a heating function intermittently.
  • the temperature controller (Tc) includes a power switch (sw) , a power connection indicator 10, a direct-current (DC) converter 12, a 12V constant voltage generator 14, a comparator 16, a photo-coupler 18 and an on/off switch 22, a temperature setter 20, and a voltage transformer 24.
  • the power switch (sw) is electrically connected to a power source 2 of 110V/220V, to thus allow a user to turn on and off the heater 4.
  • the power connection indicator 10 made of light-emitting diodes such as LEDs is electrically connected to the power switch (sw) , to thereby indicate whether or not current is applied from the power source 2 to the heater .
  • the direct-current (DC) converter 12 is electrically connected to the power connection indicator 10 and made of a plurality of diodes Dl, D2, D3 and D4, which converts an alternating-current (AC) voltage applied to the power connection indicator 10 into a DC voltage.
  • the 12V constant voltage generator 14 made of a Zener diode is electrically connected to the DC converter 12 and maintains and outputs the DC voltage output from the DC converter 12 as a stable voltage of 12V.
  • the comparator 16 is electrically connected to the 12V constant voltage generator 14, the sensor 8 and a temperature setter 20 so that the 12V voltage supplied from the 12V constant voltage generator 14 is used as electric power of the comparator 16, and which is electrically connected to the sensor 8 so that a detected value of a heated temperature state of the heater 4 which is output from the sensor 8 is input to a first point "A" of the comparator 16, and a temperature set value output from the temperature setter 20 is input to a second point "B", to then perform a comparison operation of the input values and output a comparison result.
  • the photo-coupler 18 is electrically connected to a third point "C" of the comparator 16, and has a general structure that a triac is turned on or off according to turning-on or turning-off of the LED and thus a gate electrode of the triac is triggered. Accordingly, the function of the on/off switch 22 which is connected to the photo-coupler 18 is controlled.
  • the voltage transformer 24 which is electrically connected between the on/off switch 22 which is controlled by the power switch
  • the heater 4 has an insulated and inductively coupling structure which transforms a 110V/220V AC voltage into a low voltage of 30V or less.
  • the voltage transformer 24 whose primary coil is electrically connected to the power switch (sw), and whose secondary coil is insulated and inductively coupled to the primary coil and is electrically connected to the on/off switch 22, so that a voltage of the power source 2 is voltage-dropped into a low voltage of 30V or less .
  • the temperature setter 20 is electrically connected to a second point "B" of the comparator 16.
  • a 110V/220V power source is the primary coil of the voltage transformer 24 and the DC converter 12.
  • the 12V DC voltage is supplied to the comparator 16 as power of the comparator 16.
  • the comparator 16 compares a signal input from the sensor 8 in the mat (M) with a value set in the temperature setter 20, and a positive electric potential is given to the third point "C" in the case that an electric potential at the first point "A” becomes lower than that at the second point “B.” Accordingly, the LED in the photo-coupler 18 is turned off.
  • the triac in the photo-coupler 18 is turned off, and thus the gate electrode of the on/off switch 22 is not triggered.
  • the secondary voltage of the voltage transformer is not supplied to the heater 4 in the mat structure (M) .
  • the triac in the photo-coupler 18 is turned on, and thus the gate electrode of the on/off switch 22 is triggered.
  • the secondary voltage of 30V or less of the voltage transformer 24 is supplied to the heater 4 in the mat structure (M) .
  • the electric heating system according to the present invention can supply a low voltage of 30V or less from the heater. Accordingly, an electrical leakage and shock accident can be removed.
  • the present invention has been described with respect to particularly preferred embodiment.
  • the present invention is not limited to the above embodiment, and it is possible for one who has an ordinary skill in the art to make various modifications andvariations, without departing off the spirit of the present invention .

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Control Of Resistance Heating (AREA)

Abstract

An electric heating system is provided, in which a hazard of an electric leakage and an electric shock can be removed when the electric heating system is used on the ground in the open field or at a high humid place such as a green house called a vinyl house. The electric heating system includes a mat (M) having a heater (4) and a sensor (6), and a temperature controller (Tc). A comparator (16) receives the 12V DC voltage and compares a signal input from a sensor (6) of the mat (M) with a value set in a temperature setter (20). According to a comparison result of the comparator (16), the LED of a photo-coupler (18) is turned on or off. As a result, when the LED is turned on, the triac in the photo-coupler (18) is turned on and thus the gate of the on/off switch (22) is triggered, which causes the secondary voltage of the transformer (24) be supplied to the heater (4).

Description

ELECTRIC HEATING SYSTEM USING LOW VOLTAGE
Technical Field
The present invention relates to an electric heating system using a low voltage, and more particularly, to an electric heating system which generates heat at a voltage not more than 30V.
Background Art
Recently, in addition to a traditional heating system, an electric floor, an electric blanket, an electric cushion, an electric mat, and so on are widely used. In general, as shown in FIG. 1, a power source
2 of 110/220V is connected to a heater 4. The temperature of the heater
4 is controlled by a temperature controller 6.
A reference numeral 8 denotes a sensor which can detect the heater 4 and a heated temperature of the heater 4. A reference numeral 20 denotes a temperature setter which is connected to the temperature controller 6 and controls the temperature controller 6 which controls a turn-on state and a turn-off state of the current to be applied to the heater 4, considering a value obtained by manipulating the temperature controller 6 and a value detected by the temperature sensor 8.
By the way, since the conventional heating system has a structure of supplying a commercial voltage of 110V/220V to the heater and performs the temperature control of the heater, users may run a risk of an electric leakage and shock accident.
Disclosure of the Invention
To solve the above problems, it is an object of the present invention to provide an electric heating system using a low voltage by employing a perfectly insulated and inductively coupled transformer, in which a secondary voltage of the transformer is supplied to a heater as a low voltage of 30V or less and thus an electric leakage and shock accident does not happen.
To accomplish the above objects of the present invention, according to an aspect of the present invention, there is provided an electric heating system using a low voltage comprising: a mat (M) having a heater (4) and a sensor (8) ; and a temperature controller (Tc) which is electrically connected to the heater (4) in the mat (M) , wherein the temperature controller (Tc) comprises: a power switch (sw) which is electrically connected to a power source (2) of 110V/220V; a power connection indicator (10) which is electrically connected to the power switch (sw) ; a direct-current (DC) converter (12) which converts an alternating-current (AC) voltage applied to the power connection indicator (10) into a DC voltage; a 12V constant voltage generator (14) which is electrically connected to the DC converter (12) and maintains and outputs the DC voltage output from the DC converter (12) as a stable voltage of 12V; a comparator (16) which is electrically connected to the 12V constant voltage generator (14) so that the 12V voltage supplied from the 12V constant voltage generator (14) is used as electric power of the comparator (16) , and which is electrically
connected to the sensor (8) so that a detected value of a heated temperature state of the heater (4) which is output from the sensor (8) is input to a first point "A" of the comparator (16) ; a photo-coupler (18) which is electrically connected to a third point "C" of the comparator (16) and an on/off switch (22) which performs a disconnection or connection function of current to be supplied to the heater (4) according to a value output from the third point "C" of the comparator (16) ; a temperature setter (20) which is electrically connected to a second point "B" of the comparator (16) so that a temperature set value output from the temperature setter (20) is input to the second point "B" of the comparator (16) ; and a voltage transformer (24 ) whose primary coil is electrically connected to the power switch (sw) and whose secondary coil is insulated and inductively coupled to the primary coil and is electrically connected to the on/off switch (22) , so that a voltage of 110V/220V is voltage-dropped into a low voltage of 30V or less.
Brief Description of the Drawings The above and other obj ects and advantages of the present invention will become more apparent by describing the preferred embodiment thereof in more detail with reference to the accompanying drawings in which:
FIG. 1 is a schematic block diagram showing a configuration of a conventional electric heating system; FIG. 2 is a schematic block diagram showing a configuration of an electric heating system according to the present invention; and
FIG.3 is a detailed circuit diagram showing an electric heating system according "to the present invention.
Best Mode for Carrying out the Invention
Hereinbelow, an electric heating system according to the present inventionwill be describedwith reference to the accompanying drawings . Since the same elements as those of the conventional electric heating system are assigned the same reference numerals as those of the conventional electric heating system, the detailed description thereof will be omitted.
As shown in FIGs. 2 and 3, an electric heating system using a low voltage according to an embodiment of the present invention includes a mat (M) having a heater 4 and a sensor 8, and a temperature controller (Tc) which is electrically connected to the heater 4 in the mat (M) , in which controlled current is supplied to the heater 4 to thus allow the heater 4 to perform a heating function intermittently.
Meanwhile, the temperature controller (Tc) includes a power switch (sw) , a power connection indicator 10, a direct-current (DC) converter 12, a 12V constant voltage generator 14, a comparator 16, a photo-coupler 18 and an on/off switch 22, a temperature setter 20, and a voltage transformer 24.
The power switch (sw) is electrically connected to a power source 2 of 110V/220V, to thus allow a user to turn on and off the heater 4. The power connection indicator 10 made of light-emitting diodes such as LEDs is electrically connected to the power switch (sw) , to thereby indicate whether or not current is applied from the power source 2 to the heater .
The direct-current (DC) converter 12 is electrically connected to the power connection indicator 10 and made of a plurality of diodes Dl, D2, D3 and D4, which converts an alternating-current (AC) voltage applied to the power connection indicator 10 into a DC voltage. The 12V constant voltage generator 14 made of a Zener diode is electrically connected to the DC converter 12 and maintains and outputs the DC voltage output from the DC converter 12 as a stable voltage of 12V.
The comparator 16 is electrically connected to the 12V constant voltage generator 14, the sensor 8 and a temperature setter 20 so that the 12V voltage supplied from the 12V constant voltage generator 14 is used as electric power of the comparator 16, and which is electrically connected to the sensor 8 so that a detected value of a heated temperature state of the heater 4 which is output from the sensor 8 is input to a first point "A" of the comparator 16, and a temperature set value output from the temperature setter 20 is input to a second point "B", to then perform a comparison operation of the input values and output a comparison result.
The photo-coupler 18 is electrically connected to a third point "C" of the comparator 16, and has a general structure that a triac is turned on or off according to turning-on or turning-off of the LED and thus a gate electrode of the triac is triggered. Accordingly, the function of the on/off switch 22 which is connected to the photo-coupler 18 is controlled.
The voltage transformer 24 which is electrically connected between the on/off switch 22 which is controlled by the power switch
(sw) and the heater 4 has an insulated and inductively coupling structure which transforms a 110V/220V AC voltage into a low voltage of 30V or less.
That is, the voltage transformer 24 whose primary coil is electrically connected to the power switch (sw), and whose secondary coil is insulated and inductively coupled to the primary coil and is electrically connected to the on/off switch 22, so that a voltage of the power source 2 is voltage-dropped into a low voltage of 30V or less .
The temperature setter 20 is electrically connected to a second point "B" of the comparator 16.
In the electric heating system according to the present invention, according to turning-on of the power switch (sw) , a 110V/220V power source is the primary coil of the voltage transformer 24 and the DC converter 12.
Thus, a DC voltage of 12V having no voltage fluctuation can be obtained through the DC converter 12 andthe 12Vconstantvoltage generator 14 .
The 12V DC voltage is supplied to the comparator 16 as power of the comparator 16. The comparator 16 compares a signal input from the sensor 8 in the mat (M) with a value set in the temperature setter 20, and a positive electric potential is given to the third point "C" in the case that an electric potential at the first point "A" becomes lower than that at the second point "B." Accordingly, the LED in the photo-coupler 18 is turned off.
Thus, the triac in the photo-coupler 18 is turned off, and thus the gate electrode of the on/off switch 22 is not triggered. As a result, the secondary voltage of the voltage transformer
Figure imgf000008_0001
is not supplied to the heater 4 in the mat structure (M) .
Reversely, when an electric potential at the first point "A" of the comparator 16 is higher than that at the second point "B, " a negative electric potential is given to the third point "C" in the case that an electric potential at the first point "A" becomes higher than that at the second point "B." Accordingly, the LED in the photo-coupler 18 is turned on.
Thus, the triac in the photo-coupler 18 is turned on, and thus the gate electrode of the on/off switch 22 is triggered. As a result, the secondary voltage of 30V or less of the voltage transformer 24 is supplied to the heater 4 in the mat structure (M) . Industrial Applicability
As described above, the electric heating system according to the present invention can supply a low voltage of 30V or less from the heater. Accordingly, an electrical leakage and shock accident can be removed.
As described above, the present invention has been described with respect to particularly preferred embodiment. However, the present invention is not limited to the above embodiment, and it is possible for one who has an ordinary skill in the art to make various modifications andvariations, without departing off the spirit of the present invention .

Claims

What is claimed is:
1. An electric heating system using a low voltage comprising: a mat (M) having a heater (4) and a sensor (8); and a temperature controller (Tc) which is electrically connected to the heater (4) in the mat (M) , wherein the temperature controller (Tc) comprises: a power switch (sw) which is electrically connected to a power source (2) of 110V/220V; a power connection indicator (10) which is electrically connected to the power switch (sw) ; a direct-current (DC) converter (12) which converts an alternating-current (AC) voltage applied to the power connection indicator (10) into a DC voltage; a 12V constant voltage generator (14) which is electrically connected to the DC converter (12) and maintains and outputs the DC voltage output from the DC converter (12) as a stable voltage of 12V; a comparator (16) which is electrically connected to the 12V constant voltage generator (14) so that the 12V voltage supplied from the 12V constant voltage generator (14) is used as electric power of the comparator (16) , and which is electrically connected to the sensor (8) so that a detected value of a heated temperature state of the heater (4) which is output from the sensor (8) is input to a first point "A" of the comparator (16); a photo-coupler (18) which is electrically connected to a third point "C" of the comparator (16) and an on/off switch (22) which performs a disconnection or connection function of current to be supplied to
the heater (4) according to a value output from the third point "C" of the comparator (16); a temperature setter (20) which is electrically connected to a second point "B" of the comparator (16) so that a temperature set value output from the temperature setter (20) is input to the second point "B" of the comparator (16) ; and a voltage transformer (24) whose primary coil is electrically connected to the power switch (sw) and whose secondary coil is insulated and inductively coupledto the primary coil and is electrically connected to the on/off switch (22), so that a voltage of 110V/220V is voltage-dropped into a low voltage of 30V or less.
PCT/KR2003/002750 2002-12-16 2003-12-16 Electric heating system using low voltage WO2004056155A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003286950A AU2003286950A1 (en) 2002-12-16 2003-12-16 Electric heating system using low voltage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR20-2002-0037431 2002-12-16
KR20-2002-0037431U KR200307950Y1 (en) 2002-12-16 2002-12-16 electric heat system using the low voltage

Publications (1)

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Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2725445A1 (en) * 2011-06-22 2014-04-30 Shenzhen Xishuo Technology Company Limited Electric blanket and low-voltage thermostatic control device thereof
CN106569522A (en) * 2016-11-04 2017-04-19 浙江硕和机器人科技有限公司 Intelligent heating blanket
CN106820816A (en) * 2017-03-21 2017-06-13 桐乡市万达利电器有限公司 Moveable electric-heating device
WO2018138393A1 (en) 2017-01-26 2018-08-02 Borras Esteve Vicenta Isabel Swimming cap that is gentle on the hair
CN108594057A (en) * 2018-04-28 2018-09-28 上海与德通讯技术有限公司 The electrical leakage detecting method and electronic equipment of splicing ground heat pad
WO2019052620A1 (en) 2017-09-14 2019-03-21 Khabuzov Vasilii Arsenevich Electric heating system (its variants)
RU204999U1 (en) * 2021-04-02 2021-06-22 Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) Temperature regulator
RU204988U1 (en) * 2021-04-05 2021-06-22 Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) Temperature regulator
RU204994U1 (en) * 2021-04-02 2021-06-22 Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) Temperature regulator
RU204993U1 (en) * 2021-04-02 2021-06-22 Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) Temperature regulator
RU205269U1 (en) * 2021-04-02 2021-07-06 Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) Temperature regulator
RU205580U1 (en) * 2021-04-02 2021-07-22 Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) Temperature regulator
RU206154U1 (en) * 2021-04-02 2021-08-25 Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) Temperature regulator
RU206921U1 (en) * 2021-06-22 2021-10-01 Федеральное государственное бюджетное образовательное учреждение высшего образования "Волгоградский государственный технический университет" (ВолгГТУ) Temperature regulator

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Publication number Priority date Publication date Assignee Title
JPH01220385A (en) * 1988-02-26 1989-09-04 Matsushita Electric Ind Co Ltd Temperature control device
KR19990031930U (en) * 1997-12-31 1999-07-26 정몽규 Freeze protection device for water supply hose of concrete pumping car
KR20010054783A (en) * 1999-12-08 2001-07-02 진종도 Heating and electric potential mattress circuit

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01220385A (en) * 1988-02-26 1989-09-04 Matsushita Electric Ind Co Ltd Temperature control device
KR19990031930U (en) * 1997-12-31 1999-07-26 정몽규 Freeze protection device for water supply hose of concrete pumping car
KR20010054783A (en) * 1999-12-08 2001-07-02 진종도 Heating and electric potential mattress circuit

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2725445A4 (en) * 2011-06-22 2015-04-01 Shenzhen Xishuo Technology Company Ltd Electric blanket and low-voltage thermostatic control device thereof
EP2725445A1 (en) * 2011-06-22 2014-04-30 Shenzhen Xishuo Technology Company Limited Electric blanket and low-voltage thermostatic control device thereof
CN106569522B (en) * 2016-11-04 2019-05-07 浙江硕和机器人科技有限公司 A kind of intelligent electric blanket
CN106569522A (en) * 2016-11-04 2017-04-19 浙江硕和机器人科技有限公司 Intelligent heating blanket
WO2018138393A1 (en) 2017-01-26 2018-08-02 Borras Esteve Vicenta Isabel Swimming cap that is gentle on the hair
CN106820816A (en) * 2017-03-21 2017-06-13 桐乡市万达利电器有限公司 Moveable electric-heating device
DE212018000321U1 (en) 2017-09-14 2020-05-15 Vasilii Arsenevich Khabuzov Electric heating system (embodiments)
WO2019052620A1 (en) 2017-09-14 2019-03-21 Khabuzov Vasilii Arsenevich Electric heating system (its variants)
CN108594057A (en) * 2018-04-28 2018-09-28 上海与德通讯技术有限公司 The electrical leakage detecting method and electronic equipment of splicing ground heat pad
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