CN112015210A - Bedding temperature control system based on thermal resistance temperature measurement - Google Patents
Bedding temperature control system based on thermal resistance temperature measurement Download PDFInfo
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- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
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- G05D23/19—Control of temperature characterised by the use of electric means
- G05D23/30—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature
- G05D23/303—Automatic controllers with an auxiliary heating device affecting the sensing element, e.g. for anticipating change of temperature using a sensing element having a resistance varying with temperature, e.g. thermistor
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Abstract
The invention relates to the field of household appliances in bedrooms, and discloses a bedding temperature control system based on thermal resistance temperature measurement, which is used for improving the heating comfort degree of a bedding heat generating device such as an electric blanket and the like. The invention comprises a heat-producing device and a controller, wherein the controller takes the real-time temperature in the bedding as input and the thermal neutral temperature of a human body as a control target, and controls the heat-producing device to enable the temperature in the bedding to be close to the thermal neutral temperature of the human body; the controller comprises an internal temperature detection circuit, a pulse is applied to the heating resistance wire of the heat generating device before the controller controls the temperature, and the internal temperature detection circuit realizes the calibration of the resistance value of the heating resistance wire according to the feedback signal of the pulse by the heating resistance wire; when the controller carries out temperature control, inside temperature detect circuit reachs the temperature of heat production device's heating resistor wire according to the resistance and the voltage value of heat production device's heating resistor wire, and then obtains the real-time temperature in the bed clothes. The invention is suitable for temperature control of the electric blanket.
Description
Technical Field
The invention relates to the field of bedroom household appliances, in particular to a bedding temperature control system based on thermal resistance temperature measurement.
Background
At present, different forms of electric heating are used as main or auxiliary heating appliances in electric appliances of electric blankets, and the heating can be realized by directly using an electric heater. The electric heating is mainly performed by a switch or an on-off mode, and has no temperature control function.
The sleeping needs a comfortable environment, and the over-low or over-high temperature has a great influence on the sleeping quality. In winter, a quilt is covered on a human body thick, and an electric blanket is arranged below the quilt, so that a relatively closed environment is formed. When a person enters the bedding, the energy of metabolism of the human body is about 40W, the human body gradually enters a sleep state along with the adaptation of the human body to the environment temperature in the bedding, and the electric heating temperature is generally required to be lower or even closed to keep the temperature in the bedding within a reasonable range.
The user just can open the warm bed clothes of electric blanket soon before falling asleep, and obviously when the electric blanket used, the cold bed clothes of beginning to heat, and after later stage people got into the bed clothes, the internal environment temperature was different with the heat that stacks human heat needs, and the electric blanket promptly drops into different power, and this power also has a relation with indoor ambient temperature, and different indoor temperatures lead to the heat leakage quantity difference of bed clothes system.
Taking the working of an electric blanket as an example, for example, 100W, the electric heating has two states of on or off, and the electric heating is generally protected by a mechanical temperature controller and a fuse. The electric blanket in the existing market has various defects: firstly, the electric blanket heating only has a plurality of fixed power gears without temperature control function, and the fixed heating power is provided according to the gears, which is obviously inconsistent with the actual needs of the whole sleeping process of the user. Before sleeping, the electric blanket is started to be either at low temperature or high temperature. When the low temperature gear is started, the heating speed is slow, and when the high temperature gear is started, although the heating speed is fast, even if the gear with smaller power is replaced during sleeping, the user cannot be ensured not to be awakened. The current detection control scheme of the electric blanket can not meet the requirement of comfortable sleep of a user. In addition, the temperature in the bedding is difficult to acquire, and the temperature in the bedding cannot be accurately acquired in the prior art.
The heating power of each gear set by the electric blanket is fixed, and the physique, the environment and the thickness of the bedding of a user are different, so that the continuous and dynamic adjustment cannot be realized, and the possibility that the user is awakened by heat is high. Some of the proposals for this purpose are to add a temperature detection function to the electric blanket as in patent nos.: 201821794891.2, entitled Intelligent electric blanket for detecting vital signs, which discloses a technical proposal comprising: the electric blanket comprises an electric blanket body, a heating layer and a heating layer, wherein the electric blanket body comprises an upper surface layer, a heating layer and a lower surface layer, and the upper surface layer, the heating layer and the lower surface layer are sewn together; the temperature sensor comprises a first temperature sensor for measuring room temperature and a second temperature sensor for measuring bed temperature, the first temperature sensor is arranged at the lower part of the upper surface layer at one side corner of the electric blanket body, and the second temperature sensor is arranged in the heating layer of the electric blanket; the humidity sensor is arranged at the lower part of the upper surface layer on one side of the electric blanket body; the vital sign detection sensor is arranged in a region, opposite to a human body, of the lower portion of the upper surface layer of the electric blanket body and opposite to the electric blanket body. The intelligent electric blanket carries out analysis processing and outputs a control signal to a processor of a heating circuit through a temperature sensor, a detection vital sign sensor, a humidity sensor and the like arranged on the electric blanket body, wherein the temperature signal and the pressure signal on the surface of the blanket body and the humidity signal on the surface of the blanket body are collected, and the processor is automatically opened and closed, saves energy and has higher practicability and safety. The electric blanket can intelligently control the temperature, but does not consider the relationship between the age of a user, the bedding condition and the external environment. And the electric blanket is generally folded and placed after the use in winter, which has influence on the reliability of the sensor in the electric blanket.
In order to realize accurate temperature control of the electric blanket, the invention provides an electric blanket with patent number 201910988475.9, namely an electric blanket constant temperature control method, device and system, which is sold in the market for many years, and discloses an electric blanket constant temperature control method, wherein the electric blanket constant temperature control method comprises the following steps: acquiring voltage data corresponding to the temperature detection circuit; calculating the current temperature value of the temperature detection circuit according to the voltage data; comparing the current temperature value with a preset temperature value, and judging whether temperature adjustment is needed according to a comparison result, wherein the preset temperature value is obtained according to a temperature setting circuit; when temperature adjustment is needed, generating a temperature adjustment signal according to the difference value between the current temperature value and the preset temperature value; and controlling the heating circuit according to the temperature adjusting signal. Meanwhile, the invention also discloses an electric blanket constant temperature control device, which is characterized by comprising the following components: the acquisition module is used for acquiring voltage data corresponding to the temperature detection circuit; the calculation module is used for calculating the current temperature value of the temperature detection circuit according to the voltage data; the processing module is used for comparing the current temperature value with a preset temperature value and judging whether temperature adjustment is needed or not according to a comparison result, wherein the preset temperature value is obtained according to a temperature setting circuit; the signal generating module is used for generating a temperature adjusting signal according to the difference value between the current temperature value and the preset temperature value when temperature adjustment is needed; and the control module is used for controlling the heating circuit according to the temperature adjusting signal. Further, the temperature detection circuit is further disclosed, wherein the temperature detection circuit is used for generating a corresponding resistance value according to the temperature measurement resistance wire; the electric blanket constant temperature control device is used for acquiring corresponding voltage data according to the resistance value, judging whether the current temperature value of the electric blanket needs to be adjusted or not according to the voltage data, and generating a temperature adjusting signal when the current temperature value of the electric blanket needs to be adjusted; the heating circuit is used for heating according to the temperature adjusting signal. Although the electric blanket can intelligently control the temperature, the relationship among the age of a user, the bedding condition and the external environment is still not considered.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a bedding temperature control system based on thermal resistance temperature measurement, which is used for improving the heating comfort of bedding heat generating devices such as an electric blanket and the like.
In order to solve the problems, the invention provides a bedding temperature control system based on thermal resistance temperature measurement, which comprises a heat production device and a controller, wherein the controller takes the real-time temperature in the bedding as input and the thermal neutral temperature of a human body as a control target, and controls the heat production device to enable the temperature in the bedding to be close to the thermal neutral temperature of the human body;
the controller comprises an internal temperature detection circuit, before temperature control is carried out by the controller, a pulse is applied to the heating resistance wire of the heat generating device through a voltage pulser in the controller, and the internal temperature detection circuit realizes the calibration of the resistance value of the heating resistance wire according to the feedback signal of the pulse by the heating resistance wire; when the controller carries out temperature control, inside temperature detect circuit reachs the temperature of heat production device's heating resistor wire according to the resistance and the voltage value of heat production device's heating resistor wire, and then obtains the real-time temperature in the bed clothes.
Furthermore, the invention also comprises a sign acquisition module, wherein the sign acquisition module is used for acquiring sign information of the user during sleeping, and the controller can calculate the metabolism rate of the user through the acquired sign information and adjust the target thermal neutral temperature in real time based on the metabolism rate.
Furthermore, the invention also comprises an alarm module, and when the controller deduces that the user is a special crowd through the sign information, the alarm module can provide an alarm reminding function when the user sign is abnormal.
Furthermore, the intelligent heat-generating system further comprises a data mining module, wherein the data mining module is used for collecting working time data of the system and mining the work and rest time of the user according to the collected data, and the controller is used for starting the heat-generating device before the user falls asleep and closing the heat-generating device before the user gets up according to the work and rest time of the user.
Further, the controller comprises a silicon controlled control circuit to achieve the output power of the continuously adjustable electric heater by changing or controlling the duty ratio of the silicon controlled rectifier.
Further, the heat generating device may be an electric blanket.
The invention has the beneficial effects that: the invention takes the real-time temperature in the bedding as input and the thermal neutral temperature of the human body as a control target, and can lead the temperature in the bedding to be close to the thermal neutral temperature of the human body, thereby improving the comfort level of users. The invention can avoid changing the prior electric blanket structure, does not depend on a temperature sensor when acquiring the temperature in the bedding, avoids the situation of the reliability reduction of the sensor, only needs to add an internal temperature detection circuit in the circuit of the electric blanket when in implementation, can accurately calculate the temperature in the bedding through a temperature calculation module, and ensures the temperature control precision of the system.
Detailed Description
FIG. 1 is a functional diagram of an embodiment;
FIG. 2 is a schematic diagram of a multi-section U or Z-shaped resistance wire heating;
FIG. 3 is a block diagram of a narrow voltage attemperation circuit;
fig. 4 is a block diagram of a wide voltage attemperation circuit.
Detailed Description
In order to improve the heating comfort of a heat generating device of a bedding such as an electric blanket, the embodiment provides a bedding temperature control system based on a thermal balance equation, which comprises the heat generating device (i.e. the electric blanket) and a controller, wherein the controller comprises a temperature calculating module, the controller takes the real-time temperature in the bedding calculated by the temperature calculating module as input, and takes the thermal neutral temperature of a human body as a control target, the heat generating device is controlled to enable the temperature in the bedding to be close to the thermal neutral temperature of the human body (for example, the temperature difference between the two is less than 1 ℃), and the working principle of the system is shown in fig. 1. The heat neutral temperature is also referred to as a neutral temperature, and means a temperature at which a person does not feel cold nor heat, and the heat neutral temperature is a temperature at which the person feels comfortable under a certain condition. The indoor temperature under certain conditions represents the evaluation of people on comfort, the heat Sensation evaluation generally adopts the heat Sensation Votes (TSV) recommended by ASHRAE standard, when the indoor temperature is 1.0-20 ℃, the heat neutral temperature in the bedding is generally 30-36 ℃, the heat neutral temperature can be adjusted by combining the actual feeling of a user during specific control, for example, the heat neutral temperature is calculated as the preset heat neutral temperature according to PMV, and an individual can increase or decrease the heat neutral temperature next time according to the actual sleeping process feeling.
In the embodiment, the temperature in the bedding does not need to be detected by a temperature sensor, but an internal temperature detection circuit is arranged in the controller, before the controller controls the temperature, a pulse is applied to the heating resistance wire of the heat generating device by a voltage pulser in the controller, and the internal temperature detection circuit realizes the calibration of the resistance value of the heating resistance wire according to the feedback signal of the pulse by the heating resistance wire; when the controller carries out temperature control, inside temperature detect circuit reachs the temperature of the heating resistor wire of heat production device according to the resistance and the voltage value of the heating resistor wire of heat production device, and the temperature of heating resistor wire is the real-time temperature in the bed clothes promptly.
In this example, to maintain the temperature (i.e., the neutral temperature) T in the bedding constant, it can be assumed that Q is in the beddingPowder medicine＝QElectric power+QTrunkThis thermal equilibrium equation holds true or holds true within the bounds of the error. Wherein Q isPowder medicineFor radiating heat of bedding, QPowder medicine＝λ·TDifference (D)·APowder medicineT, λ is the thermal conductivity of the bedding, expressed in joules/(degree.m)2Second), TDifference (D)Is the temperature difference between the inside and outside of the bedding, TDifference (D)Temperature inside the bedding-temperature outside the bedding (i.e. temperature in the bedroom), APowder medicineThe heat dissipation area for the radiation heat dissipation of the bedding, t is the heat dissipation time (i.e. the sleep time), QElectric powerHeat generated by electric blanket, QTrunkHeat produced for the trunk, QTrunk＝k*QHuman being，QHuman beingFor the heat production of the human body in sleep, k is the ratio of the torso surface area to the total (head + torso) surface of the human body, the adult surface area is 1.5 to 2.0 square meters, the infant is 0.5 square meters, for adults the head surface area is between 0.24 square meters and 0.4 square meters, and the torso surface area is between 1.35 square meters and 1.6 square meters. Since the human body can be regarded as consuming energy equal to producing energy in the sleep state, QHuman beingThe metabolic rate of the human body in the sleeping state can be used for calculating, namely, the controller can calculate the energy production of the human body in the sleeping state by using the metabolic rate of the human body in the sleeping state, and further obtain the heat production of the trunk of the human body in the sleeping state according to the energy production of the human body in the sleeping state. When acquiring the metabolic rate, the embodiment can be realized by matching with a sign acquisition module:
s1, firstly, storing fitting functions of sleep time and metabolism rate of different crowds in the controller. The fitting function of the sleep time to the metabolic rate can be obtained through a relationship table of the sleep time to the human metabolic rate disclosed by the existing research, and taking adult males as an example, the relationship table of the sleep time to the human metabolic rate can be shown in table 1.
TABLE 1 relationship table of male sleeping time in summer to human metabolic rate
| Sleep time | 0 | 0.5 | 1 | 1.5 | 2 | 2.5 | 3 | 3.5 |
| Metabolic rate of human body | 49.3 | 47 | 45 | 43.2 | 41.7 | 40.4 | 39.3 | 38.5 |
| Sleep time | 4 | 4.5 | 5 | 5.5 | 6 | 6.5 | 7 | 7+ |
| Metabolic rate of human body | 38 | 37.7 | 37.7 | 38 | 38.5 | 39.3 | 40.3 | 40.3 |
S2, acquiring sign information of a user through the sign acquisition module, providing the sign information of the user during sleeping for the controller, dividing the user into corresponding crowds (such as the common old, the elderly, children or adults) after the controller acquires the sign information of the user, and substituting the actual sleeping time of the current user into a fitting function of the sleeping time and the metabolic rate of the crowd where the current user is located during temperature control to obtain the real-time metabolic rate.
λ、APowder medicineK these values can be stored in advance in the controller, QTrunkAnd QElectric powerOr real-time calculation can be carried out, and during temperature control, after the controller acquires parameters such as user sign information, temperature information in a bedroom, time and the like through the corresponding sensing module, the locally stored lambda and A are calledPowder medicineAnd k, the temperature in the bedding can be accurately controlled, and further the temperature regulation in the bedding is realized.
In addition, because the heat neutral temperatures of the human body are different at different metabolism rates, the controller can further adjust the target heat neutral temperature in real time according to the metabolism rate after obtaining the metabolism rate in step S2, the comfortable sleeping temperature for the male in winter is shown in table 2, and the metabolism rates at different times in table 2 are different, and the neutral temperatures are also different. The embodiment can adjust according to different sleeping time according to the time of turning on the electric blanket as the sleep starting time.
TABLE 2
In this example, the system further includes an alarm module, and when the controller deduces that the user is a special crowd (for example, a user in an age group over 70 years old) through the sign information, an alarm reminding function is provided through the alarm module when the user sign is abnormal.
In this example, the system further includes a data mining module for collecting working time data of the system and mining a work and rest time of the user based on the collected data, and the controller turns on the heat generating device before the user falls asleep (e.g., 10 minutes before getting into bed) and turns off the heat generating device before the user gets up (e.g., 20 minutes before getting up) based on the work and rest time of the user.
In this embodiment, the heat generating device is an electric blanket, in order to increase the heat dissipation area and facilitate installation, the electric heating component used by the electric blanket adopts a U-shaped structure, fig. 2 shows that a plurality of sections of U-shaped electric heating pipes are installed in the electric blanket side by side, three connectors are led out, and two live wires and one zero wire are shared. The controller comprises a PFC control circuit capable of automatically adjusting according to input alternating voltage and load and a silicon controlled rectifier control circuit with adjustable duty ratio, wherein the silicon controlled rectifier control circuit achieves the output power of the continuously adjustable electric heater by changing or controlling the duty ratio of the silicon controlled rectifier; under the condition of considering cost, a narrow-voltage temperature-adjustable circuit can be selected for design, so that the electric heating can output rated power under the condition that the voltage of an input alternating current power supply is at rated voltage and higher voltage, and FIG. 3 is a block diagram of the narrow-voltage temperature-adjustable circuit; when a wide-voltage temperature-adjustable circuit design is used and the voltage of an input alternating-current power supply is lower than the rated value of the input alternating-current power supply, the rated power of the electric heating can be output by combining with the PFC boosting of a circuit, and fig. 4 is a block diagram of the wide-voltage temperature-adjustable circuit.
For the controller, the embodiment also provides a continuously adjustable electric heating control method which comprises the following steps:
the method comprises the following steps: detecting the voltage of an alternating current input power supply and the internal temperature of the electric blanket;
step two: calculating an initial duty ratio according to the power supply voltage and the internal temperature of the electric blanket;
step three: the frequency which is three times or two times (between 2 and 3) times of the input alternating current is used as the control frequency of the bidirectional controllable silicon, and the control signal of the bidirectional controllable silicon is output by combining the initial duty ratio, so that the electric heating is put into operation.
Step IV: after the electric heating is put into operation, the temperature difference between the internal temperature of the electric blanket and the internal temperature of the bedding is detected (the temperature can be a temperature value which is supposed in advance, such as a 37-degree value or a 36-degree value, and a 35-degree value), and the output duty ratio of the bidirectional controllable silicon is adjusted to adjust the temperature rising rate so as to quickly reach and maintain the set temperature.
Claims (6)
1. A bedding temperature control system based on thermal resistance temperature measurement is characterized by comprising a heat generating device and a controller, wherein the controller takes the real-time temperature in the bedding as input and the thermal neutral temperature of a human body as a control target, and controls the heat generating device to enable the temperature in the bedding to be close to the thermal neutral temperature of the human body;
the controller comprises an internal temperature detection circuit, before temperature control is carried out by the controller, a pulse is applied to the heating resistance wire of the heat generating device through a voltage pulser in the controller, and the internal temperature detection circuit realizes the calibration of the resistance value of the heating resistance wire according to the feedback signal of the pulse by the heating resistance wire; when the controller carries out temperature control, inside temperature detect circuit reachs the temperature of heat production device's heating resistor wire according to the resistance and the voltage value of heat production device's heating resistor wire, and then obtains the real-time temperature in the bed clothes.
2. The bedding temperature control system based on thermal resistance temperature measurement as claimed in claim 1, further comprising a sign acquisition module for acquiring sign information of the user during sleep, wherein the controller calculates the metabolism rate of the user through the acquired sign information and adjusts the target thermal neutral temperature in real time based on the metabolism rate.
3. The bedding temperature control system based on thermal resistance temperature measurement as claimed in claim 2, further comprising an alarm module, wherein when the controller calculates that the user is a special crowd through the physical sign information, an alarm reminding function is provided through the alarm module when the physical sign of the user is abnormal.
4. The system as claimed in claim 1, further comprising a data mining module for collecting working time data of the system and mining the user's work and rest time based on the collected data, wherein the controller turns on the heat generating device before the user falls asleep and turns off the heat generating device before the user gets up based on the user's work and rest time.
5. The bedding temperature control system based on thermoresistive temperature determination of claim 1, wherein said controller includes a thyristor control circuit to achieve continuously adjustable output power of the electric heater by varying or controlling a duty cycle of the thyristor.
6. The bedding temperature control system based on the measurement of heat resistance temperature as claimed in any one of claims 1 to 5, wherein the heat generating device is an electric blanket.
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| CN112616202A (en) * | 2020-12-24 | 2021-04-06 | 四川长虹空调有限公司 | Method for adjusting heating temperature of electric blanket based on external controller |
| CN112684712A (en) * | 2020-12-24 | 2021-04-20 | 四川长虹空调有限公司 | Electric blanket linkage control system and control method |
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