CN108966372B - Temperature control method of electric heating pad - Google Patents
Temperature control method of electric heating pad Download PDFInfo
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- CN108966372B CN108966372B CN201810923787.7A CN201810923787A CN108966372B CN 108966372 B CN108966372 B CN 108966372B CN 201810923787 A CN201810923787 A CN 201810923787A CN 108966372 B CN108966372 B CN 108966372B
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- temperature
- electric heating
- heating pad
- duty ratio
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- 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
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- 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
- H05B1/0227—Applications
- H05B1/0252—Domestic applications
-
- 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
- H05B3/02—Details
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Resistance Heating (AREA)
- Central Heating Systems (AREA)
Abstract
The invention relates to a temperature control method of an electric heating pad, and belongs to the technical field of electric heating control. The method comprises 1) setting a constant temperature value and a fixed time; 2) measuring the real-time temperature of the electric heating pad and comparing the real-time temperature with a constant temperature value; 3) when the real-time temperature is lower than the constant temperature value, firstly controlling the electric heating pad to continuously electrify for a fixed time by a first duty ratio pulse signal of 100 percent; 4) when the fixed time is over, controlling the electric heating pad to perform pulse power-up by a second duty ratio pulse signal smaller than 100%; 5) when the real-time temperature is greater than or equal to the constant temperature value, controlling the electric heating pad to stop electrifying; 6) and when the real-time temperature measurement and/or the temperature insurance of the electric heating pad fail, controlling the electric heating pad to carry out pulse power-up by the pulse signal with the second duty ratio. By adopting the method, even if the temperature sensor and the temperature fuse of the existing electric heating pad are failed, the temperature of the electric heating pad can be controlled to be maintained at a safe highest temperature and not exceed the safe highest temperature all the time; thereby thoroughly ensuring that the electric heating pad does not catch fire.
Description
Technical Field
The invention relates to a temperature control method of an electric blanket or an electric pad, belonging to the technical field of electric heating control.
Background
Pads or blankets for electric heating or physiotherapy are commonly used in people's daily life. The electric heating sleeping mattress is generally of a constant temperature control type, and the constant temperature value is controlled to be set between 25 ℃ and 50 ℃. The heating temperature is sampled in real time by using a temperature sensor arranged in the cushion or the blanket in the temperature range, and the sampling value is compared with the set temperature value to realize automatic temperature regulation so as to achieve the aim of constant temperature. This temperature control is currently a commonly used approach, and a point-sampling NTC temperature sensor and a disposable temperature-limiting temperature fuse are typically installed in the mat or blanket. The disposable temperature fuse is used for limiting the temperature to not exceed a specified upper limit temperature value once the NTC fails so as to play a role in temperature limiting protection. However, if the disposable thermal fuse is installed at multiple points in the mat, the reliability is improved, but the manufacturing cost is high, the internal wiring is complicated, and the process is difficult to realize. When the NTC temperature sensor and/or the disposable temperature fuse fail or are not provided, the electric pad or blanket must cause a fire.
Disclosure of Invention
The invention aims to solve the technical problem of ensuring that the electric heating pad or blanket does not catch fire when in use when a temperature sensor and a fuse of the existing electric heating pad or blanket fail.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a temperature control method of an electric heating pad comprises the following steps:
1) setting a constant temperature value and a fixed time;
2) measuring the real-time temperature of the electric heating pad and comparing the real-time temperature with the constant temperature value;
3) when the real-time temperature is lower than the constant temperature value, firstly controlling the electric heating pad to continuously electrify for the fixed time by a first duty ratio pulse signal of 100 percent;
4) when the fixed time is over, controlling the electric heating pad to perform pulse energization by a second duty ratio pulse signal smaller than 100%;
5) when the real-time temperature is larger than or equal to the constant temperature value, controlling the electric heating pad to stop electrifying;
6) and when the real-time temperature measurement and/or the temperature insurance of the electric heating pad fail, controlling the electric heating pad to carry out pulse power-up by the second duty ratio pulse signal.
Further, the second duty ratio is a duty ratio of a pulse signal corresponding to the electric heating pad when the electric heating pad reaches a safe maximum temperature value obtained by pulse energization of the electric heating pad by pulse signals with various duty ratios, and the safe maximum temperature value is selected according to manual experience.
The second duty ratio is obtained according to the following experimental steps and is preset in the control device of the electric heating pad:
1) the functions of the existing electric heating pad for measuring the real-time temperature and the temperature safety power-off are disabled or removed;
2) controlling the existing electric heating pad to be powered on in a pulse mode according to pulse signals with different duty ratios;
3) measuring a plurality of temperature values which are reached by the heating of the existing electric heating pad after the pulse power-up;
4) finding out the highest temperature value in the temperature values, and judging and screening out the safe highest temperature value according to experience;
5) and finding out the pulse signal corresponding to the safe highest temperature value, and obtaining the duty ratio of the pulse signal as the second duty ratio.
The invention adopts the technical scheme that the method has the beneficial effects that: on the basis of the existing constant temperature control (inner ring control for comparing the real-time temperature of the electric heating pad with the set constant temperature value), the pulse power-up with a specific duty ratio is carried out on the electric heating pad through a second duty ratio pulse signal which is less than 100 percent, and the specific duty ratio is the duty ratio (namely the second duty ratio) of the pulse signal when the electric heating pad reaches the safer highest temperature under the pulse power-up through experiments in advance; therefore, the heating (an outer ring control) formed by intermittent pulse power-up under the control of the adjustable specific duty ratio pulse signal is added besides the heating of the electric heating pad by linear power-up according to the existing constant temperature control (namely, the electric heating pad is controlled by the first duty ratio pulse signal to continuously power up for a fixed time), so that even if the temperature sensor and the temperature fuse of the existing electric heating pad fail, the temperature of the electric heating pad can be controlled to rise to a safer highest temperature and then the highest temperature is always kept not to exceed the highest temperature (whether the highest temperature is safe or not can be manually determined according to experience); thereby thoroughly ensuring that the electric heating pad never generates fire because the temperature rises too high under the condition of only linear continuous power supply like the prior electric heating pad.
The invention is particularly unique in that for the electric heating pad powered by pulse with adjustable duty ratio, the inventor of the invention finds out and proves through experiments that the highest temperature of the electric heating pad in the process of supplying power to the electric heating pad (or blanket) by pulse current with certain range of duty ratio can completely reach a safer temperature (whether the safety can be determined according to human experience), thereby pre-screening and finding the relationship between the duty ratio of the pulse signal corresponding to the highest temperature of safer pulse power supply of the heating wire through an experimental method. The interpretation of this relationship is: because the electric pad is heated and radiated when being powered on, the temperature is balanced at a certain safe highest temperature point when the heating is equal to the radiation; the highest temperature of this equilibrium exists and is maintained even without constant temperature feedback closed loop control; for pulse energization with different duty ratios, no matter how long the pulse energization is carried out, the electric heating pad always reaches a certain safer highest temperature point, so that the duty ratios of pulse signals corresponding to the safer highest temperatures can be selected through experiments, and the pulse signals with the duty ratios are used for controlling the pulse energization of the electric heating pad.
Based on the unique findings, the inventors intensively studied and obtained the method of the present invention through many years of application summary and trial and error. The method can ensure the safety of the electric heating pad in use even if the constant temperature control and the safety of the existing electric heating pad are completely failed, and successfully solves the problem that the temperature of the existing electric heating pad is increased and out of control to cause fire under the condition that the temperature sensor and the disposable temperature fuse are failed due to various reasons. As for the existing electric heating pad (or blanket), the technology is not less than a fundamental technical change.
The improvement of the above technical solution is that the range of the second duty ratio is 20% -60%, the range of the safe maximum temperature value is 40-80 ℃, and the corresponding relation between the second duty ratio and the safe maximum temperature value is selected as follows: the second duty cycle is selected to be 20% when the safe maximum temperature value is 40 ℃, 25% when the safe maximum temperature value is 44 ℃, 50% when the safe maximum temperature value is 55 ℃, and 60% when the safe maximum temperature value is 80 ℃.
The second improvement of the technical proposal is that the range of the constant temperature value is 25-50 ℃, and the range of the fixed time is 60-600 seconds.
The third perfection of the above technical solution is that it further comprises the steps of: setting an environmental temperature limit value, measuring the environmental real-time temperature, and controlling the electric heating pad to stop power supply when the environmental real-time temperature is greater than or equal to the environmental temperature limit value.
The fourth improvement of the technical scheme is that the electric heating pad also contains a negative potential signal.
Drawings
The method for controlling the temperature of the electric heating pad of the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic circuit diagram of a control apparatus used in a control method according to an embodiment;
fig. 2 is a schematic circuit diagram of a control device used in the control method according to the second embodiment.
Detailed Description
Example one
The control device adopted by the temperature control method of the electric heating pad of the embodiment is shown in figure 1 and comprises a power supply for supplying power to a heating wire (or wire) in the electric heating pad, and the electric heating pad is provided with a one-time temperature fusing fuse F5. The power supply is connected with the control device by the commercial power 220V and then forms power supply output through transformation and rectification. The first temperature sensor Res Thermal-1 and the first temperature control processor MCU1 are used for measuring the real-time temperature of the electric heating pad, a first electronic switch BTA08-1 and a second electronic switch BTA08-2 are arranged between the power supply and the heating wire, and an AND gate is formed between the first electronic switch BTA08-1 and the second electronic switch BTA 08-2. Also included is a second temperature control processor MCU2, and a KEYBOARD DECODER DECODER KEYBOARD. The input end of the first electronic switch BTA08-1 is connected to the output end (pin heat) of the first temperature control processor MCU1 through the optocoupler TRIAC 1. The input end of the second electronic switch BTA08-2 is connected with the output end (pin PA 5) of the second temperature control processor MCU2 through an opto-coupler TRIAC 2. The output ends J1 and J2 of the first electronic switch BTA08-1 and the second electronic switch BTA08-2 are connected to a rectifier DL1, and the output end of the rectifier Bridge 1/RS 507 is connected with a heating wire RT1/RT 2. The electric pad has a temperature fusing fuse F5. The DECODER keyguard is used to input constant temperature values to the first temperature control processor MCU1 in use (although constant temperature values could be pre-cured within the MCU 1). The duty ratio set value and the fixed time in a certain range are set in the second temperature control processor MCU2 in advance in a curing way. The range of the constant temperature value is 25-50 ℃, the range of the fixed time is 60-600 seconds, and the ranges of the constant temperature value and the fixed time can be obtained according to experience or experiments.
The temperature control method of the electric heating pad comprises the following steps:
1) setting a constant temperature value (e.g., 50 ℃) and a fixed time (e.g., 100 seconds);
2) measuring the real-time temperature of the electric heating pad and comparing the real-time temperature with a constant temperature value;
3) when the real-time temperature is 50 ℃ lower than the constant temperature value, firstly controlling the electric heating pad to continuously electrify for the fixed time by a first duty ratio pulse signal of 100 percent;
4) when the fixed time is 100 seconds, controlling the electric heating pad to perform pulse energization by a second duty ratio pulse signal smaller than 100%;
5) when the real-time temperature is greater than or equal to the constant temperature value by 50 ℃, controlling the electric heating pad to stop electrifying;
6) and when the real-time temperature measurement and/or the temperature insurance of the electric heating pad fail, controlling the electric heating pad to carry out pulse power-up by the second duty ratio pulse signal.
The step 3) is specifically: the power-on and starting-up device is characterized in that when the real-time temperature of the electric heating pad measured by the first temperature sensor Res Thermal-1 is smaller than a set constant temperature value by 50 ℃, a port Heat of the first temperature control processor MCU1 outputs a low level signal, the first electronic switch BTA08-1 is conducted, at the moment, the input end PA2 of the second temperature control processor MCU2 receives the low level output by the Heat and outputs a 100% first duty ratio (namely, full duty ratio) low level pulse signal from the port PA5 to enable the second electronic switch BTA08-2 to be conducted simultaneously, and the power supply continuously energizes the heating wire RT1/RT2 for a fixed time through the conducted first electronic switch BTA08-1 and the second electronic switch BTA 08-2.
The step 4) is specifically: when the fixed time is over, the port PA5 of the second temperature control processor MCU2 outputs a low-level pulse signal with a second duty ratio less than 100 percent to enable the second electronic switch BTA08-2 to be in a state of alternately conducting and cutting off, and at the moment, the power supply conducts pulse power on to the heating wire RT1/RT2 through the conducting first electronic switch BTA08-1 and the pulse discontinuous conducting second electronic switch BTA 08-2.
The step 5) is specifically: when the real-time temperature of the electric heating pad measured by the first temperature sensor Res Thermal-1 is greater than or equal to the set constant temperature value of 50 ℃, the port Heat of the first temperature control processor MCU1 outputs a high level signal, the first electronic switch BTA08-1 is turned off, the output end J2 of the first electronic switch is disconnected from the access of the input rectifier DL 1), the power supply stops energizing the heating wire RT1/RT2, but at the moment, the port PA5 of the second temperature control processor MCU2 still outputs a low level pulse signal with a second duty ratio less than 100 percent, so that the second electronic switch BTA08-2 is in a repeated on and off state.
The step 6) is specifically: when the first electronic switch BTA08-1 is normally open due to the failure of the first temperature sensor Res Thermal-1 or/and the temperature fusing fuse F5, the power supply performs pulse energization on the heating wire RT1/RT2 through the normally open first electronic switch BTA08-1 and the pulse discontinuously-conducted second electronic switch BTA 08-2.
The second duty ratio in this embodiment is a duty ratio of a pulse signal obtained by pulse-energizing the heating wire in the electric pad with pulse signals of various duty ratios, which corresponds to when the electric pad reaches the highest temperature, and is preset in the second temperature control processor MCU 2; typically the safe maximum temperature value is selected based on manual experience. The second duty cycle is obtained by the following experimental steps:
1) the function of the existing electric heating pad for measuring the real-time temperature and cutting off the temperature fuse is disabled or removed (namely, a device for measuring the real-time temperature and cutting off the temperature fuse is removed);
2) applying a plurality of pulse power-ups to the heating wire with a plurality of different duty cycle pulse signals;
3) measuring a plurality of temperature values which are reached by heating of a heating wire of the existing electric heating pad after various pulses are electrified;
4) screening the temperature values and finding out the highest safe temperature value;
5) and finding out the duty ratio (as a second duty ratio) of the pulse signal corresponding to the safe highest temperature value, and presetting the duty ratio in the second temperature control processor.
In this embodiment, the second duty ratio range is selected to be 20% to 50%, the second duty ratio is specifically selected according to a corresponding relationship between the second duty ratio range and the maximum safe temperature value, and the corresponding relationship between the second duty ratio range and the maximum safe temperature value is as follows: the second duty cycle may be selected to be 20% when the safe maximum temperature value is 40 ℃, 25% when the safe maximum temperature value is 44 ℃, 50% when the safe maximum temperature value is 55 ℃, and 60% when the safe maximum temperature value is 80 ℃.
Example two
The temperature control method of the electric heating pad of the present embodiment is an improvement on the basis of the first embodiment, except that the method is the same as the first embodiment:
1) as shown in fig. 2, a second temperature sensor ResThermal-2 for measuring the real-time temperature of the environment is added, an environment temperature limit value is set in the second temperature control processor MCU2, the real-time temperature of the environment is measured at the same time, and when the real-time temperature of the environment is greater than or equal to the environment temperature limit value, the electric pad is controlled to stop being powered on, the environment temperature limit value of the embodiment is selected to be 35 ℃, the environment temperature limit value is selected according to human experience and is not limited to 35 ℃;
2) as shown in fig. 2, a negative potential generating unit is added. The 220V mains supply is output to the negative potential generating unit after voltage doubling, and the output end of the negative potential generating unit is connected with a negative potential line (an output port 5 in figure 2) arranged in the electric heating pad after voltage doubling, so that a negative potential signal is applied to the electric heating pad, and the electric heating pad can be used for physical therapy.
Claims (6)
1. A temperature control method of an electric heating pad is characterized by comprising the following steps:
1) setting a constant temperature value and a fixed time;
2) measuring the real-time temperature of the electric heating pad and comparing the real-time temperature with the constant temperature value;
3) when the real-time temperature is lower than the constant temperature value, firstly controlling the electric heating pad to continuously electrify for the fixed time by a first duty ratio pulse signal of 100 percent;
4) when the fixed time is over, controlling the electric heating pad to perform pulse energization by a second duty ratio pulse signal smaller than 100%;
5) when the real-time temperature is larger than or equal to the constant temperature value, controlling the electric heating pad to stop electrifying;
6) when the real-time temperature measurement and/or the temperature insurance of the electric heating pad fail, controlling the electric heating pad to carry out pulse power-up by the second duty ratio pulse signal; the second duty ratio is the duty ratio of the pulse signal corresponding to the electric heating pad when the electric heating pad reaches the safe highest temperature value obtained by pulse energization of the electric heating pad by the pulse signals with various duty ratios, and the safe highest temperature value is selected according to manual experience.
2. The method of claim 1, wherein the step of controlling the temperature of the electric mat comprises: the second duty ratio is obtained according to the following experimental steps and is preset in the control device of the electric heating pad:
1) the functions of the existing electric heating pad for measuring the real-time temperature and the temperature safety power-off are disabled or removed;
2) controlling the existing electric heating pad to be powered on in a pulse mode according to pulse signals with different duty ratios;
3) measuring a plurality of temperature values which are reached by the heating of the existing electric heating pad after the pulse power-up;
4) finding out the highest temperature value in the temperature values, and judging and screening out the safe highest temperature value according to experience;
5) and finding out the pulse signal corresponding to the safe highest temperature value, and obtaining the duty ratio of the pulse signal as the second duty ratio.
3. The method of claim 2, wherein the second duty ratio is in a range of 20-60%, the safe maximum temperature value is in a range of 40-80 ℃, and the corresponding relationship between the second duty ratio and the safe maximum temperature value is selected as follows: the second duty cycle is selected to be 20% when the safe maximum temperature value is 40 ℃, 25% when the safe maximum temperature value is 44 ℃, 50% when the safe maximum temperature value is 55 ℃, and 60% when the safe maximum temperature value is 80 ℃.
4. The method for controlling the temperature of an electric mat according to any one of claims 1-3, wherein: the constant temperature value ranges from 25 to 50 deg.c and the fixed time ranges from 60 to 600 seconds.
5. The method for controlling the temperature of an electric mat according to any one of claims 1-3, further comprising the steps of: setting an environmental temperature limit value, measuring the environmental real-time temperature, and controlling the electric heating pad to stop power supply when the environmental real-time temperature is greater than or equal to the environmental temperature limit value.
6. The method for controlling the temperature of an electric mat according to any one of claims 1-3, wherein: the electric heating pad also contains a negative potential signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810923787.7A CN108966372B (en) | 2018-08-14 | 2018-08-14 | Temperature control method of electric heating pad |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810923787.7A CN108966372B (en) | 2018-08-14 | 2018-08-14 | Temperature control method of electric heating pad |
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| CN108966372A CN108966372A (en) | 2018-12-07 |
| CN108966372B true CN108966372B (en) | 2021-09-28 |
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| CN112067164B (en) * | 2020-09-14 | 2022-07-15 | 华帝股份有限公司 | Failure judgment method for temperature sensor of evaporator |
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| CN102548056A (en) * | 2010-12-07 | 2012-07-04 | 李臣华 | Intelligent temperature-control electric heating pad |
| CN203858525U (en) * | 2014-05-20 | 2014-10-01 | 国家电网公司 | Heating circuit for electric blanket |
| CN105902079A (en) * | 2016-05-06 | 2016-08-31 | 西安唐城电热毯电器有限公司 | Intelligent electric blanket |
| CN107407941A (en) * | 2015-04-15 | 2017-11-28 | 菲利普莫里斯生产公司 | Electric heater is controlled with the apparatus and method of limit temperature with time distribution curve according to desired temperature |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200416598Y1 (en) * | 2006-03-09 | 2006-05-19 | 이미애 | Temperature control apparatus of electric heating for a bed |
| US8927908B2 (en) * | 2012-04-05 | 2015-01-06 | Multi-Technology Health Care Inc. | Temperature control circuit for two heating devices |
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- 2018-08-14 CN CN201810923787.7A patent/CN108966372B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102548056A (en) * | 2010-12-07 | 2012-07-04 | 李臣华 | Intelligent temperature-control electric heating pad |
| CN203858525U (en) * | 2014-05-20 | 2014-10-01 | 国家电网公司 | Heating circuit for electric blanket |
| CN107407941A (en) * | 2015-04-15 | 2017-11-28 | 菲利普莫里斯生产公司 | Electric heater is controlled with the apparatus and method of limit temperature with time distribution curve according to desired temperature |
| CN105902079A (en) * | 2016-05-06 | 2016-08-31 | 西安唐城电热毯电器有限公司 | Intelligent electric blanket |
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