CN115568050A - Dry burning prevention method, device, system, electronic equipment and storage medium - Google Patents
Dry burning prevention method, device, system, electronic equipment and storage medium Download PDFInfo
- Publication number
- CN115568050A CN115568050A CN202211418705.6A CN202211418705A CN115568050A CN 115568050 A CN115568050 A CN 115568050A CN 202211418705 A CN202211418705 A CN 202211418705A CN 115568050 A CN115568050 A CN 115568050A
- Authority
- CN
- China
- Prior art keywords
- time
- heating load
- voltage signal
- dry
- duration
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Images
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
- H05B3/78—Heating arrangements specially adapted for immersion heating
Landscapes
- Drying Of Solid Materials (AREA)
Abstract
The application is applicable to the technical field of electronic circuits, and provides an anti-dry heating method, device, system, electronic equipment and storage medium. The method comprises the steps of obtaining a voltage signal applied to a heating load by a constant power module; calculating the duration of the voltage signal in a control period; the starting time of the control period is the time when the rising edge of the voltage signal is acquired; determining whether the heating load is dry-burned or not according to the duration time and a first preset time; and when the heating load is determined to be dry-burning, sending a stop signal to the constant power module to enable the constant power module to stop heating the heating load. Whether the heating load is dry-burned or not can be judged by measuring the duration of the voltage signal applied to the heating load by the constant power module, and the method is easier than measuring other analog quantities (such as the resistance value of the heating load), does not need a high-precision ADC, and is favorable for reducing the cost of electronic equipment.
Description
Technical Field
The present application relates to the field of electronic circuit technology, and in particular, to a dry burning prevention method, apparatus, system, electronic device, and storage medium.
Background
At present, many electronic devices have a heating function, and the heating principle is to provide a voltage to a heating load to drive the load to generate heat, so as to achieve the heating effect. Electronic equipment with a heating function generally heats liquid, and after the heated liquid is dried, the temperature of a heating load exceeds the boiling point of the liquid to cause high-temperature danger, so that the electronic equipment with the heating function needs to have an anti-dry heating function.
The existing dry burning prevention method generally judges whether the heating load is dry burning or not according to the change of the resistance value of the heating load by measuring the resistance value of the heating load, but the resistance value of the heating load is an Analog quantity, and a high-precision ADC (Analog-to-digital converter) is required, so that the realization cost of the method is high, and the realization process is complex.
Disclosure of Invention
The embodiment of the application provides an anti-dry heating method, an anti-dry heating device, an anti-dry heating system, electronic equipment and a storage medium, and can solve the problems that the existing anti-dry heating method is high in implementation cost and complex in implementation process.
In a first aspect, an embodiment of the present application provides an anti-dry heating method, including: acquiring a voltage signal applied to a heating load by a constant power module;
calculating the duration of the voltage signal in a control period; the starting time of the control period is the time when the rising edge of the voltage signal is acquired;
determining whether the heating load is dry-burned or not according to the duration time and a first preset time;
and when the heating load is determined to be dry-burning, sending a stop signal to the constant power module to enable the constant power module to stop heating the heating load.
In a possible implementation manner of the first aspect, the calculating a duration of the voltage signal in one control period includes:
in the same control period, recording the time of the obtained rising edge of the voltage signal as a first time;
recording the time of the obtained falling edge of the voltage signal as a second time;
and determining the duration according to the first time and the second time.
In a possible implementation manner of the first aspect, the determining whether the heating load is dry-burning according to the duration and a first preset time includes:
calculating a time difference between the duration and the first preset time;
and when the time difference is larger than a preset time difference, determining that the heating load is dry-burned.
In a possible implementation manner of the first aspect, before determining that the heating load is dry-burned when the time difference is greater than a preset time difference, the method further includes:
acquiring a first resistance value and a second resistance value of the heating load; the first resistance value is the resistance value of the heating load before the constant power module works, and the second resistance value is the resistance value of the heating load when the heating load is in dry burning;
when the heating load is the first resistance value, calculating a first duration of a voltage signal applied to the heating load by the constant power module in one control cycle;
when the heating load is the second resistance value, the constant power module applies a voltage signal on the heating load for a second duration of a control period;
and determining the preset time difference value according to the first duration and the second duration.
In a possible implementation manner of the first aspect, before the determining whether the heating load is dry-burned according to the duration and the first preset time, the method further includes:
in a first control period, recording the time of the acquired rising edge of the voltage signal as a third time;
recording the time of the obtained falling edge of the voltage signal as a fourth time;
and determining the first preset time according to the third time and the fourth time.
In a possible implementation manner of the first aspect, the method further includes:
and if the voltage signal is not acquired after the second preset time, determining that the heating load is not dried.
In a second aspect, an embodiment of the present application provides an anti-dry heating device, including:
the acquisition module is used for acquiring a voltage signal applied to the heating load by the constant power module;
the calculating module is used for calculating the duration of the voltage signal in one control period; the starting time of the control period is the time when the rising edge of the voltage signal is acquired;
the determining module is used for determining whether the heating load is dry-burned or not according to the duration time and a first preset time;
and the sending module is used for sending a stop signal to the constant power module when the heating load is determined to be dry-burned, so that the constant power module stops heating the heating load.
In a third aspect, an embodiment of the present application provides an anti-dry heating system, including a control module and a constant power module; the constant power module is electrically connected with the control module, and the control module and the constant power module are both used for being electrically connected with a heating load; the constant power module is configured to maintain a constant power across the heating load, and the control module is configured to perform the method of any of the first aspects.
In a fourth aspect, an embodiment of the present application provides an electronic device, including the dry burning prevention system according to any one of the third aspects.
In a fifth aspect, an embodiment of the present application provides a control module, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the method according to any one of the first aspect when executing the computer program.
In a sixth aspect, the present application provides a computer-readable storage medium, which stores a computer program, and when the computer program is executed by a control module, the computer program implements the method according to any one of the first aspect.
In a seventh aspect, the present application provides a computer program product, which when run on a control module, causes the control module to execute the method according to any one of the first aspect.
Compared with the prior art, the embodiment of the application has the advantages that:
the embodiment of the application provides an anti-dry heating method, which comprises the steps of firstly obtaining a voltage signal applied to a heating load by a constant power module. And calculating the duration of the voltage signal in one control period, wherein the starting time of one control period is the time when the rising edge of the voltage signal is acquired. And determining whether the heating load is dry-burned or not according to the duration and the first preset time. And when the heating load is determined to be dry-burned, sending a stop signal to the constant power module to enable the constant power module to stop heating the heating load. Whether the heating load is dry-burned can be judged by measuring the duration of the voltage signal applied to the heating load by the constant power module, and the method is easier than measuring other analog quantities (such as the resistance value of the heating load), does not need a high-precision ADC (analog to digital converter), and is favorable for reducing the cost of electronic equipment.
It can be understood that, for the beneficial effects of the second aspect to the seventh aspect, reference may be made to the relevant description in the first aspect, and details are not described herein again.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of an anti-dry heating system according to an embodiment of the present disclosure;
FIG. 2 is a schematic circuit diagram of an anti-dry heating system according to another embodiment of the present disclosure;
fig. 3 is a timing diagram illustrating operation of a constant power module in an anti-dry heating system according to another embodiment of the present disclosure;
FIG. 4 is a schematic flow chart illustrating a dry burning prevention method according to an embodiment of the present disclosure;
FIG. 5 is a schematic flow chart of a dry burning prevention method according to another embodiment of the present disclosure;
FIG. 6 is a schematic flow chart of a dry burning prevention method according to another embodiment of the present disclosure;
FIG. 7 is a schematic flow chart of a dry burning prevention method according to another embodiment of the present application;
FIG. 8 is a schematic flow chart of a dry burning prevention method according to another embodiment of the present application;
fig. 9 is a schematic structural diagram of an anti-dry heating apparatus according to an embodiment of the present disclosure;
fig. 10 is a schematic structural diagram of a control module according to an embodiment of the present application.
In the figure: 10. a control module; 100. a processor; 101. a memory; 102. a computer program; 20. a constant power module; 201. a drive circuit; 202. an oscillator; 203. an RS trigger; 204. a multiplier; 205. a gain amplification circuit; 206. a voltage controlled current source; 207. a power supply; 30. heating the load; 91. an acquisition module; 92. a calculation module; 93. a determination module; 94. and a sending module.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in the specification of this application and the appended claims, the term "if" may be interpreted contextually as "when 8230that is," or "once" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
Furthermore, in the description of the present application and the appended claims, the terms "first," "second," "third," and the like are used for distinguishing between descriptions and not necessarily for describing or implying relative importance.
Reference throughout this specification to "one embodiment" or "some embodiments," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the present application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," or the like, in various places throughout this specification are not necessarily all referring to the same embodiment, but rather "one or more but not all embodiments" unless specifically stated otherwise. The terms "comprising," "including," "having," and variations thereof mean "including, but not limited to," unless expressly specified otherwise.
The current dry burning prevention method judges whether dry burning phenomenon occurs or not by utilizing the temperature characteristic of a load, the technical principle is that the resistance value of the load is directly measured, whether dry burning phenomenon occurs or not is judged according to the change of the resistance value of the load, when the resistance value of the load is directly measured, a controller with an ADC is often used, the realization process is complex, and the cost is high.
In view of the above problems, the present embodiment provides an anti-dry heating system, as shown in fig. 1, including a control module 10 and a constant power module 20. The constant power module 20 is electrically connected with the control module 10, and both the constant power module 20 and the control module 10 are used for electrically connecting with the heating load 30.
Specifically, when the dry-heating prevention system is used, the control module 10 sends an enable signal to the constant power module 20, so that the constant power module 20 starts heating the heating load 30. The constant power module 20 is configured to keep the power of the heating load 30 constant, and the power control adopts Pulse Width Modulation (PWM). Power P = V on heating load 30 2 *D/R LOAD Where V represents the voltage signal applied to the heating load 30 by the constant power module 20 when the first switch Q1 is turned on, D represents the duty ratio of the pulse width modulation of the first switch in the constant power module 20, and R represents LOAD Indicating the resistance of the heating load 30, the resistance of the heating load 30 increases with the temperature when the temperature coefficient is positive, and since the power P is constant, the duty ratio (or on-time) of the first switching tube also changes when the resistance of the heating load 30 changes. When the first switch tube in the constant power module 20 is turned on, the voltage signal is applied to the heating load 30, and when the first switch tube in the constant power module 20 is turned off, the voltage signal on the heating load 30 is 0, so that the duration of the time that the voltage signal is applied to the heating load 30 represents the on-time (or duty ratio) of the first switch tube. The conduction time (or duty ratio) of the first switch tube changes with the change of the resistance value of the heating load 30, so that whether the resistance value of the heating load 30 changes or not can be determined by measuring the time, and further whether the heating load 30 is dry-burned or not can be determined. The control module 10 is used to obtain a voltage signal applied by the constant power module 20 to the heating load 30. Calculating the duration of the voltage signal in a control periodAnd time, wherein the starting moment of one control period is the moment when the rising edge of the voltage signal is acquired. Based on the duration and the first preset time, it is determined whether the heating load 30 is dry-burned. When it is determined that the heating load 30 is dry-burning, a stop signal is sent to the constant power module 20, so that the constant power module 20 stops heating the heating load 30. The dry burning prevention system provided by the embodiment of the application utilizes the characteristic that the duty ratio (or the conduction time) of the constant power module 20 changes along with the change of the resistance value of the heating load 30, and the change of the resistance value of the heating load 30 can be obtained by calculating the change of the duty ratio (or the conduction time), so that whether the heating load 30 is dried or not is determined. The present application calculates the change of the duty ratio (or the on-time) through the duration and the first preset time, thereby determining whether the heating load 30 is dry-burned. The dry burning prevention system provided by the embodiment of the application determines whether the heating load 30 is dry burning or not by measuring time, is easier than measuring other analog quantities (for example, the resistance value of the heating load 30), can be realized by using a controller with a counting function, and does not need a high-precision ADC (analog to digital converter). The cost of a controller with an ADC is typically more expensive and the cost of a controller with a counting function is typically less expensive. Therefore, the dry burning prevention system provided by the embodiment of the application is simple and easy to realize and low in realization cost.
It should be noted that the heating load 30 has a temperature characteristic, and the resistance value thereof changes with a change in temperature.
Illustratively, as shown in fig. 2, the constant power module 20 includes a driving circuit 201, an oscillator 202, an RS flip-flop 203, a multiplier 204, a gain amplifying circuit 205, a voltage-controlled current source 206, a first switch tube Q1, a second switch tube Q2, a first capacitor C1, a comparator Comp, and a power supply 207. A first conduction end of the first switch tube Q1 is electrically connected to the positive electrode of the power supply 207, the negative electrode of the power supply 207 is grounded, a second conduction end of the first switch tube Q1 is electrically connected to the input end of the multiplier 204 and the first end of the heating load 30, respectively, the second end of the heating load 30 is grounded, the output end of the multiplier 204 is electrically connected to the input end of the gain amplifying circuit 205, the output end of the gain amplifying circuit 205 is electrically connected to the input end of the voltage-controlled current source 206, and the output end of the voltage-controlled current source 206 is electrically connected to the output end of the voltage-controlled current source 206Respectively electrically connected to the first conduction terminal of the second switch Q2, the first terminal of the first capacitor C1 and the positive input terminal of the comparator Comp, the second conduction terminal of the second switch Q2 and the second terminal of the first capacitor C1 are both grounded, and the control terminal of the second switch Q2 and the output terminal of the RS flip-flop 203
Electrically connected, the negative input of the comparator Comp being arranged to receive a reference voltage signal V ref The output terminal of the comparator Comp is electrically connected to the R terminal of the RS flip-flop 203, the S terminal of the RS flip-flop 203 is electrically connected to the oscillator 202, the output terminal Q of the RS flip-flop 203 is electrically connected to the input terminal of the driving circuit 201, the output terminal of the driving circuit 201 is electrically connected to the control terminal of the first switching tube Q1, wherein the current signal I is a current signal applied to the heating load 30, the voltage signal V is a voltage signal provided by the power supply 207, the voltage gain of the gain amplifying circuit 205 is K, and the output of the gain amplifying circuit is a voltage signal V P Voltage signal V P Controlling the current signal I output by the voltage-controlled current source 206 C Current signal I C Charging the first capacitor C1 to generate a voltage signal V C Voltage signal V C And a reference voltage signal V ref Compares and outputs the control signal Ck to control the output state of the RS flip-flop 203, the output terminal of the RS flip-flop 203
For controlling the second switch Q2 to reset the first capacitor C1. Reference voltage signal V ref Representing the target power for control.
The operation of the constant power module 20 is described in detail below with reference to fig. 3. The oscillator 202 outputs a pulse signal OSC, which sets the Q output of the RS flip-flop 203 to "1" at the beginning of each cycle, and the output of the RS flip-flop 203
To "0", the second switch Q2 is turned off, and the current signal Ic outputted by the voltage-controlled current source 206 starts to act on the first switchThe capacitor C1 is charged. When the voltage signal Vc on the first capacitor C1 reaches the reference voltage signal V ref When the output of the comparator Comp is over, the control signal Ck from the comparator Comp resets the RS flip-flop 203, i.e. the output Q is "0", the output
Is 1, output end
The value "1" turns on the second switch Q2 and quickly discharges the first capacitor C1 to zero. At this time, the driving circuit 201 turns off the first switching tube Q1, and the voltage signal V on the heating load 30 is 0. The time for the output Q of the RS flip-flop 203 to keep "1" is D × Ts, D is the duty cycle of the first switch Q1, and Ts is the period of the pulse signal OSC, that is, the control period. If the current signal I of the heating load 30 decreases due to the resistance value of the heating load 30 increasing, the output of the multiplier 204 also decreases, resulting in the decrease of the current signal Ic, the decrease of the rising speed of the voltage signal Vc of the first capacitor C1 and the need of more time to reach the reference voltage signal V ref Thereby increasing the duty cycle D of the first switching tube Q1. The control module 10 determines whether the heating load 30 is dry-burned or not by measuring time by using the characteristic that the duty ratio (or the on-time) of the constant power module 20 changes along with the resistance value of the heating load 30, which is easier than measuring other analog quantities (for example, the resistance value of the heating load 30), and has a counting function, and a high-precision ADC is not required, so that the cost is low.
Illustratively, the first switching tube Q1 and the second switching tube Q2 are metal-oxide semiconductor field effect transistors.
The embodiment of the application also provides electronic equipment which comprises the anti-dry heating system. The electronic equipment provided by the embodiment of the application determines whether the electronic equipment is dry-burned or not by measuring time, is easier to measure than other analog quantities (such as resistance of heating load), can be realized by using the controller with the counting function, and does not need a high-precision ADC. The cost of a controller with an ADC is generally more expensive and the cost of a controller with a counting function is generally cheaper. Therefore, the electronic equipment provided by the embodiment of the application is simple and easy to implement and low in implementation cost.
For example, the electronic device may be a hot water kettle, a water heater, a water dispenser, and the like.
As shown in fig. 4, an embodiment of the present application further provides an anti-dry heating method, including steps S101 to S104.
And S101, acquiring a voltage signal applied to a heating load by the constant power module.
Specifically, a voltage signal applied to the heating load by the constant power module is acquired by the control module, and the control module calculates the duration of the voltage signal in one control cycle according to the acquired voltage signal.
S102, calculating the duration of the voltage signal in a control period; the starting time of one control period is the time when the rising edge of the voltage signal is acquired.
Specifically, when a first switching tube in the constant power module is turned on, a voltage signal provided by the power supply is applied to the heating load, and when the first switching tube is turned off, the voltage signal on the heating load is 0. Therefore, the conduction time (or duty ratio) of the first switching tube can be determined by the duration of the voltage signal applied to the heating load, the conduction time (or duty ratio) of the first switching tube changes along with the change of the resistance value of the heating load, and therefore, the change of the resistance value of the heating load can be determined only by measuring the change of the time, and further, whether the heating load is dry-burned or not can be determined.
Illustratively, as shown in fig. 5, the duration of the voltage signal in one control cycle is calculated, including steps S1021 to S1023.
S1021, in the same control cycle, the time of the rising edge of the acquired voltage signal is regarded as the first time.
Specifically, the control module starts to count from the time of the acquired rising edge of the voltage signal, and the time of starting to count is the first time.
In S1022, the time of the falling edge of the acquired voltage signal is referred to as a second time.
Specifically, in the same control period, the control module stops counting from the time of the obtained falling edge of the voltage signal, and the time of stopping counting is the second time.
And S1023, determining the duration according to the first time and the second time.
Specifically, the difference between the second time and the first time is calculated to obtain the duration, where the duration is the conduction time (or duty ratio) of the first switching tube in one control period, and the conduction time corresponds to the resistance value of the heating load when the heating load is heated in one control period.
From the above, the control module determines the duration according to the rising edge and the falling edge of the voltage signal in the same control period, and the calculation method is simple and easy to implement.
S103, determining whether the heating load is dry-burned or not according to the duration and the first preset time.
Specifically, the control module utilizes the characteristic that the duty ratio (or the conduction time) of the constant power module changes along with the change of the resistance value of the heating load, and the change of the duty ratio (or the conduction time) is calculated to obtain the change of the resistance value of the heating load, so that whether the heating load is dry-burned or not is determined. Wherein the change in duty cycle (or on-time) is determined by the duration and a first preset time.
And S104, when the heating load is determined to be dry-burned, sending a stop signal to the constant power module to stop the constant power module from heating the heating load.
Specifically, when the control module judges that the heating load is dry-burning, a warning signal is sent out, a stop signal is sent to the constant power module, and the stop signal indicates the constant power module to stop heating the heating load.
In summary, the dry burning prevention method provided by the embodiment of the present application utilizes the characteristic that the duty ratio (or the conduction time) of the constant power module changes along with the change of the resistance value of the heating load, and can obtain the change of the resistance value of the heating load by calculating the change of the duty ratio (or the conduction time), thereby determining whether the heating load is dry burning. The application calculates the change of the duty ratio (or the conduction time) through the duration and the first preset time so as to determine whether the heating load is dry-burning or not. The dry burning prevention method determines whether the heating load is dry burning or not by measuring time, is easier than measuring other analog quantity (for example, resistance value of the heating load), can be realized by using the controller with a counting function, and does not need a high-precision ADC (analog to digital converter). The cost of a controller with an ADC is generally more expensive and the cost of a controller with a counting function is generally cheaper. Therefore, the dry burning preventing method provided by the embodiment of the application is simple and easy to implement and low in implementation cost.
Exemplarily, as shown in fig. 6, step S103 includes step S1031 to step S1032.
And S1031, calculating a time difference value between the duration and the first preset time.
Specifically, the first preset time is a conducting time (or a duty ratio) of the first switching tube corresponding to the heating load heated in one control period and no dry burning occurs, and since the conducting time (or the duty ratio) is in a proportional relationship with the resistance value of the heating load, the first preset time corresponds to the resistance value of the heating load heated in one control period and no dry burning occurs. The duration corresponds to the resistance of the heating load when heated during a control cycle. Therefore, whether the resistance value of the heating load changes can be determined by calculating the time difference between the duration and the first preset time, and whether the heating load is dry-burned can be further determined.
And S1032, when the time difference is larger than the preset time difference, determining that the heating load is dry-burned.
Specifically, the preset time difference is a time difference critical value when the heating load is in dry burning, and the heating load can be determined to be in dry burning when the time difference is greater than the time difference critical value corresponding to the difference between the resistance value when the heating load is in dry burning and the resistance value of the heating load before the constant power module does not work.
Illustratively, as shown in fig. 7, step S1033 to step S1036 are further included before step S1032.
S1033, acquiring a first resistance value and a second resistance value of the heating load; the first resistance value is the resistance value of the heating load before the constant power module works, and the second resistance value is the resistance value of the heating load when the heating load is in dry burning.
Specifically, a resistance value change critical value when the heating load is in dry burning can be determined through the second resistance value and the first resistance value of the heating load, the resistance value change critical value corresponds to a time difference value critical value, and when the time difference value is larger than the time difference value critical value, the heating load is determined to be in dry burning.
S1034, when the heating load is the first resistance value, the voltage signal applied to the heating load by the constant power module is in the first duration of one control cycle.
Specifically, the first resistance value is substituted into a first calculation formula to obtain the duty ratio corresponding to the first duration, and the first calculation formula is as follows:
P=D1*V 2 /R load1
wherein, P represents the power on the heating load, the power is constant, V represents the voltage signal applied on the heating load by the constant power module when the first switch tube is conducted, D1 represents the duty ratio corresponding to the first duration, and R load1 Representing a first resistance value.
Substituting the duty ratio corresponding to the first duration into a second calculation formula to obtain the first duration, wherein the second calculation formula is as follows:
T1=D1*Ts
wherein T1 represents a first duration, D1 represents a duty ratio corresponding to the first duration, and Ts represents a control period.
And S1035, calculating a second duration of the voltage signal applied to the heating load by the constant power module in one control period when the heating load is the second resistance value.
Specifically, the second resistance value is substituted into a third calculation formula to obtain the duty ratio corresponding to the second duration, and the third calculation formula is as follows:
P=D2*V 2 /R load2
wherein, P represents the power of the heating load, the power is constant, V represents the constant power module applied to the heating load when the first switch tube is conductedA voltage signal on the thermal load, D2 represents a duty cycle corresponding to a second duration, R load2 Representing a second resistance value.
Substituting the duty ratio corresponding to the second duration time into a fourth calculation formula to obtain the second duration time, wherein the fourth calculation formula is as follows:
T2=D2*Ts
where T2 represents the second duration, D2 represents the duty cycle corresponding to the second duration, and Ts represents the control period.
And S1036, determining a preset time difference value according to the first duration and the second duration.
Specifically, the difference between the second duration and the first duration is calculated to obtain a preset time difference. The preset time difference represents a time difference critical value when the heating load is in dry burning, and if the time difference is larger than the time difference critical value, the heating load can be determined to be in dry burning.
Illustratively, as shown in fig. 8, step S105 to step S107 are further included before step S103.
And S105, in the first control period, recording the time of the acquired rising edge of the voltage signal as a third time.
Specifically, in the first control period, the control module starts to count from the time of the obtained rising edge of the voltage signal, and the time of starting to count is the third time.
S106 designates the timing of the falling edge of the acquired voltage signal as a fourth timing.
Specifically, in the first control period, the control module stops counting from the time of the acquired rising edge of the voltage signal, and the time of stopping counting is the third time.
And S107, determining first preset time according to the third time and the fourth time.
Specifically, the difference between the fourth time and the third time is calculated to obtain the first preset time. The first preset time corresponds to the resistance value of the heating load when the heating load is heated in a control period and no dry burning occurs, so that the first preset time can be used as a comparison basis.
It should be noted that the first control period is the first control period after the constant power module is started to operate.
Illustratively, the dry-heating prevention method provided by the embodiment of the present application further includes:
and if the voltage signal is not acquired after the second preset time, determining that the heating load is not dried.
Specifically, when the voltage signal is not acquired after the second preset time, it indicates that the constant power module stops heating for some reason, and the control module determines that the heating load is not dried.
Illustratively, the second predetermined time is three times the first predetermined time.
The dry burning prevention method provided by the embodiment of the application can be implemented by the following technical means:
s201, acquiring a voltage signal applied to a heating load by the constant power module.
S202, calculating a first duration of the voltage signal in a first control period and a second duration of the voltage signal in a second control period; the starting time of the first control period is the time when the rising edge of the voltage signal is acquired, the starting time of the second control period is the time when the rising edge of the voltage signal is acquired, the first control period and the second control period are two continuous control periods, and the second control period is after the first control period.
S203, determining the time change rate according to the first duration and the second duration.
And S204, determining whether the heating load is dry-burned or not according to the time change rate and a preset time change rate.
And S205, when the heating load is determined to be dry-burning, sending a stop signal to the constant power module to enable the constant power module to stop heating the heating load.
Illustratively, step S202 includes steps S2021 through S2026.
S2021, in the first control cycle, a time of the acquired rising edge of the voltage signal is referred to as a fifth time.
S2022, takes the time of the acquired falling edge of the voltage signal as a sixth time.
S2023, determining the first duration according to the fifth time and the sixth time.
S2024, in the second control cycle, a time of the acquired rising edge of the voltage signal is referred to as a seventh time.
S2025, designates the time of the acquired falling edge of the voltage signal as an eighth time.
S2026, determining the second duration according to the seventh time and the eighth time.
Illustratively, step S203 includes step S2031.
S2031, substituting the first duration and the second duration into a fifth calculation formula to obtain the time change rate, where the fifth calculation formula is:
V T =（T c2 -T c1 ）/Ts
wherein, V T Representing said time rate of change, T c2 Represents the second duration, T c1 Representing said first duration and Ts representing a control period.
Illustratively, step S204 includes steps S2041 to 2043.
S2041, calculating a third duration of the voltage signal in a third control period and a fourth duration of the voltage signal in a fourth control period, where a starting time of the third control period is a time when a rising edge of the voltage signal is obtained, a starting time of the fourth control period is a time when a rising edge of the voltage signal is obtained, the third control period and the fourth control period are two consecutive control periods, and the fourth control period is after the third control period, and the fourth control period is a control period where the heating load is in dry burning.
S2042, determining the preset time change rate according to the fourth duration and the third duration.
S2043, when the time change rate reaches the preset time change rate, determining that the heating load is dry-burned.
Illustratively, step S2041 includes steps S20411 to S20416.
S20411, in the third control period, setting the time of the obtained rising edge of the voltage signal as a ninth time.
S20412, the time of the obtained falling edge of the voltage signal is regarded as the tenth time.
S20413, determining the third duration according to the tenth time and the ninth time.
S20414, in the fourth control cycle, setting a time of a rising edge of the acquired voltage signal as an eleventh time.
S20415 designates the time of the obtained falling edge of the voltage signal as a twelfth time.
S20416, determining the fourth duration according to the twelfth time and the eleventh time.
Illustratively, step S2042 includes step S20421.
S20421, substituting the third duration and the fourth duration into a sixth calculation formula to obtain the preset time change rate, where the sixth calculation formula is:
V Ty =（T c4 -T c3 ）/Ts
wherein, V Ty Representing said predetermined time rate of change, T c4 Represents said fourth duration, T c3 Representing said third duration and Ts representing said control period.
In summary, after the heating load is dry-burned, the resistance of the heating load is rapidly increased, so that the on-time (or duty ratio) of the first switching tube in the constant power module is rapidly increased, and the rapid increase of the on-time is reflected in the change rate, so that the dry-burning prevention method provided by the embodiment of the application determines whether the heating load is dry-burned by using the time change rate.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present application.
As shown in fig. 9, an embodiment of the present application further provides an anti-dry heating apparatus, including:
and the obtaining module 91 is used for obtaining a voltage signal applied to the heating load by the constant power module.
A calculation module 92 for calculating the duration of the voltage signal in one control cycle; the starting time of the control period is the time when the rising edge of the voltage signal is acquired.
And the determining module 93 is configured to determine whether the heating load is dry-burning according to the duration and a first preset time.
And a sending module 94, configured to send a stop signal to the constant power module when it is determined that the heating load is dry, so that the constant power module stops heating the heating load.
Specifically, the dry burning prevention device provided by the embodiment of the present application utilizes the characteristic that the duty ratio (or the on-time) of the constant power module changes along with the change of the resistance value of the heating load, and can obtain the change of the resistance value of the heating load by calculating the change of the duty ratio (or the on-time), thereby determining whether the heating load is dry burning. The application calculates the change of the duty ratio (or the conduction time) through the duration and the first preset time, thereby determining whether the heating load is dry-burning or not. The dry burning prevention device provided by the embodiment of the application determines whether the heating load is dry burning or not by measuring time, is easier than measuring other analog quantities (for example, resistance value of the heating load), can be realized by using the controller with a counting function, and does not need a high-precision ADC. The cost of a controller with an ADC is generally more expensive and the cost of a controller with a counting function is generally cheaper. Therefore, the dry burning preventing device provided by the embodiment of the application is simple and easy to realize and low in cost.
In one embodiment of the present application, the calculation module 92 is further configured to:
in the same control period, recording the time of the obtained rising edge of the voltage signal as a first time;
recording the time of the obtained falling edge of the voltage signal as a second time;
and determining the duration according to the first time and the second time.
In an embodiment of the application, the determining module 93 is further configured to:
calculating a time difference value between the duration and the first preset time;
and when the time difference is larger than a preset time difference, determining that the heating load is dry-burned.
In an embodiment of the application, the determining module 93 is further configured to:
acquiring a first resistance value and a second resistance value of the heating load; the first resistance value is the resistance value of the heating load before the constant power module works, and the second resistance value is the resistance value of the heating load when the heating load is in dry burning;
when the heating load is the first resistance value, calculating a first duration of a voltage signal applied to the heating load by the constant power module in one control cycle;
when the heating load is the second resistance value, the constant power module applies a voltage signal on the heating load for a second duration of a control period;
and determining the preset time difference value according to the first duration and the second duration.
In one embodiment of the present application, the dry-heating preventing device further includes:
the first determining module is used for recording the time of the obtained rising edge of the voltage signal as a third time in a first control period;
recording the time of the obtained falling edge of the voltage signal as a fourth time;
and determining the first preset time according to the third time and the fourth time.
In one embodiment of the present application, the dry-heating preventing device further comprises:
and the second determining module is used for determining that the heating load is not dried if the voltage signal is not acquired after a second preset time.
It should be clear to those skilled in the art that, for convenience and simplicity of description, the foregoing division of the functional units and modules is only used for illustration, and in practical applications, the above function distribution may be performed by different functional units and modules as needed, that is, the internal structure of the apparatus may be divided into different functional units or modules to perform all or part of the above described functions. Each functional unit and module in the embodiments may be integrated in one processing unit, or each unit may exist alone physically, or two or more units are integrated in one unit, and the integrated unit may be implemented in a form of hardware, or in a form of software functional unit. In addition, specific names of the functional units and modules are only used for distinguishing one functional unit from another, and are not used for limiting the protection scope of the present application. For the specific working processes of the units and modules in the system, reference may be made to the corresponding processes in the foregoing method embodiments, which are not described herein again.
As shown in fig. 10, the present application further provides a control module 10, which includes at least one processor 100 (only one is shown in fig. 10), a memory 101, and a computer program 102 stored in the memory 101 and executable on the at least one processor 100, where the processor 100 executes the computer program 102 to implement the steps in the above-mentioned method embodiments. Such as step S101 through step S104 in the embodiment shown in fig. 4. Alternatively, the processor 100, when executing the computer program 102, implements the functions of the modules/units in the above-mentioned device embodiments, such as the functions of the modules 91 to 94 shown in fig. 9.
Illustratively, the computer program 102 may be partitioned into one or more modules/units that are stored in the memory 101 and executed by the processor 100 to implement the present invention. The one or more modules/units may be a series of instruction segments of the computer program 102 capable of performing specific functions, which are used to describe the execution process of the computer program 102 in the control module 10.
The Processor 100 may be a Central Processing Unit (CPU), and the Processor 100 may also be other general purpose processors, digital Signal Processors (DSPs), application Specific Integrated Circuits (ASICs), field-Programmable Gate arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 101 may in some embodiments be an internal storage unit of the control module 10, such as a hard disk or a memory of the control module 10. In other embodiments, the memory 101 may also be an external storage device of the control module 10, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), or the like provided on the control module 10. Further, the memory 101 may also include both an internal storage unit and an external storage device of the control module 10. The memory 101 is used for storing an operating system, an application program, a Boot Loader (Boot Loader), data, and other programs, such as program codes of the computer program 102. The memory 101 may also be used to temporarily store data that has been output or is to be output.
An embodiment of the present application further provides a computer-readable storage medium, where a computer program 102 is stored, and when the computer program 102 is executed by the processor 100 in the control module 10, the steps in the method embodiments described above may be implemented.
The embodiments of the present application provide a computer program product, which when run on the control module 10, enables the control module 10 to implement the steps of the above-mentioned method embodiments.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, all or part of the flow of the method of the embodiments described above can be implemented by the computer program 102 to instruct the relevant hardware to complete, the computer program 102 can be stored in a computer readable storage medium, and the computer program 102 can implement the steps of the above method embodiments when being executed by the processor 100 in the control module 10. Wherein the computer program 102 comprises computer program code, which may be in source code form, object code form, an executable file or some intermediate form, etc. The computer readable medium may include at least: any entity or device capable of carrying computer program code to the control module 10, a recording medium, computer Memory, read-Only Memory (ROM), random-Access Memory (RAM), an electrical carrier signal, a telecommunications signal, and a software distribution medium. Such as a usb-drive, a removable hard drive, a magnetic or optical disk, etc. In some jurisdictions, computer-readable media may not be an electrical carrier signal or a telecommunications signal in accordance with legislative and proprietary practices.
In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and reference may be made to the related descriptions of other embodiments for parts that are not described or illustrated in a certain embodiment.
Those of ordinary skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus/network device and method may be implemented in other ways. For example, the above-described apparatus/network device embodiments are merely illustrative, and for example, the division of the modules or units is only one logical division, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be through some interfaces, indirect coupling or communication connection of devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (10)
1. An anti-dry burning method is characterized by comprising the following steps:
acquiring a voltage signal applied to a heating load by a constant power module;
calculating the duration of the voltage signal in a control period; the starting time of the control period is the time when the rising edge of the voltage signal is acquired;
determining whether the heating load is dry-burned or not according to the duration time and a first preset time;
and when the heating load is determined to be dry-burning, sending a stop signal to the constant power module to enable the constant power module to stop heating the heating load.
2. The method of claim 1, wherein said calculating the duration of said voltage signal over a control period comprises:
in the same control period, recording the time of the rising edge of the obtained voltage signal as a first time;
recording the time of the obtained falling edge of the voltage signal as a second time;
and determining the duration according to the first time and the second time.
3. The method of claim 1, wherein said determining whether said heating load is dry-burning based on said duration and a first predetermined time comprises:
calculating a time difference between the duration and the first preset time;
and when the time difference is larger than a preset time difference, determining that the heating load is dry-burned.
4. The dry burning prevention method according to claim 3, wherein before determining that the heating load is dry burning when the time difference is greater than a preset time difference, further comprising:
acquiring a first resistance value and a second resistance value of the heating load; the first resistance value is the resistance value of the heating load before the constant power module works, and the second resistance value is the resistance value of the heating load when the heating load is in dry burning;
when the heating load is the first resistance value, calculating a first duration of a voltage signal applied to the heating load by the constant power module in one control cycle;
when the heating load is the second resistance value, the constant power module applies a voltage signal on the heating load for a second duration of a control period;
and determining the preset time difference value according to the first duration and the second duration.
5. The method of any of claims 1-4, further comprising, before said determining whether said heating load is dry-burning based on said duration and a first predetermined time, the step of:
in a first control period, recording the time of the acquired rising edge of the voltage signal as a third time;
recording the time of the obtained falling edge of the voltage signal as a fourth time;
and determining the first preset time according to the third time and the fourth time.
6. The method of any of claims 1-4, further comprising:
and if the voltage signal is not acquired after the second preset time, determining that the heating load is not dried.
7. An anti-dry heating device, comprising:
the acquisition module is used for acquiring a voltage signal applied to the heating load by the constant power module;
the calculating module is used for calculating the duration of the voltage signal in one control period; the starting time of the control period is the time when the rising edge of the voltage signal is acquired;
the determining module is used for determining whether the heating load is dry-burned or not according to the duration time and a first preset time;
and the sending module is used for sending a stop signal to the constant power module when the heating load is determined to be dry-burned, so that the constant power module stops heating the heating load.
8. An anti-dry heating system is characterized by comprising a control module and a constant power module; the constant power module is electrically connected with the control module, and the control module and the constant power module are both used for being electrically connected with a heating load; the constant power module is configured to maintain a constant power across the heating load, and the control module is configured to perform the method of any of claims 1-6.
9. An electronic device comprising the dry-fire prevention system of claim 8.
10. A computer-readable storage medium, in which a computer program is stored which, when being executed by a control module, carries out the method according to any one of claims 1-6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211418705.6A CN115568050B (en) | 2022-11-14 | 2022-11-14 | Dry burning prevention method, device, system, electronic equipment and storage medium |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211418705.6A CN115568050B (en) | 2022-11-14 | 2022-11-14 | Dry burning prevention method, device, system, electronic equipment and storage medium |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115568050A true CN115568050A (en) | 2023-01-03 |
| CN115568050B CN115568050B (en) | 2023-03-10 |
Family
ID=84770780
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211418705.6A Active CN115568050B (en) | 2022-11-14 | 2022-11-14 | Dry burning prevention method, device, system, electronic equipment and storage medium |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115568050B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105700451A (en) * | 2016-04-15 | 2016-06-22 | 深圳市赛尔美电子科技有限公司 | Dry burning prevention control method and device for electrothermal equipment |
| CN108758712A (en) * | 2018-05-29 | 2018-11-06 | 青岛海尔智能技术研发有限公司 | Anti-dry kitchen range and its control method |
| CN109974147A (en) * | 2019-04-08 | 2019-07-05 | 广东美的暖通设备有限公司 | Anti-dry control method, humidifier and the air conditioner of humidifier |
| CN112839398A (en) * | 2019-11-25 | 2021-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating device and dry burning detection method thereof |
-
2022
- 2022-11-14 CN CN202211418705.6A patent/CN115568050B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105700451A (en) * | 2016-04-15 | 2016-06-22 | 深圳市赛尔美电子科技有限公司 | Dry burning prevention control method and device for electrothermal equipment |
| CN108758712A (en) * | 2018-05-29 | 2018-11-06 | 青岛海尔智能技术研发有限公司 | Anti-dry kitchen range and its control method |
| CN109974147A (en) * | 2019-04-08 | 2019-07-05 | 广东美的暖通设备有限公司 | Anti-dry control method, humidifier and the air conditioner of humidifier |
| CN112839398A (en) * | 2019-11-25 | 2021-05-25 | 佛山市顺德区美的电热电器制造有限公司 | Electromagnetic heating device and dry burning detection method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115568050B (en) | 2023-03-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7483270B2 (en) | Fan speed control system | |
| KR101375523B1 (en) | Circuit for measuring duty cycle of pulse width modulation signal | |
| EP2216888B1 (en) | Switching power supply with over-current protection | |
| KR101143133B1 (en) | Method and system for optimizing filter compensation coefficients for a digital power control system | |
| CN111694385B (en) | Heating control method, heating device and computer storage medium | |
| US9995791B2 (en) | Power consumption monitoring device for a power source | |
| TWI343000B (en) | Apparatus and method for adjusting wording frequency of vrd by detecting temperature | |
| CA1103336A (en) | Plural load power controller with time shared processor | |
| CN115568050B (en) | Dry burning prevention method, device, system, electronic equipment and storage medium | |
| EP3514960B1 (en) | Systems and methods for on-chip temperature stabilization for temperature-sensitive components of integrated circuits | |
| US6453739B1 (en) | Time domain measurement and control system for a hot wire air flow sensor | |
| CN115951192A (en) | Junction temperature detection device, method and medium of power device | |
| CN115795256A (en) | Method, device and equipment for determining heating time of battery pack and storage medium | |
| CN108254691B (en) | Method and apparatus for charge measurement in a system using a DC-DC converter of PFM | |
| RU2502076C1 (en) | Microcontroller metering converter of resistance into binary code with voltage-controlled generator | |
| CN211086503U (en) | IGBT measuring circuit, inverter bridge arm and inverter thereof | |
| US3827046A (en) | Filtered duty cycle feedback analog to digital converter | |
| Vostrukhin et al. | Temperature sensor resistance conversion to binary code using pulse width modulation | |
| RU2752132C1 (en) | Temperature measurement method | |
| RU2697028C2 (en) | Method for measuring transient thermal characteristics of digital integrated circuits | |
| US20020084928A1 (en) | Method and apparatus for time multiplexing of thermal sensor | |
| RU2781754C1 (en) | Method for measuring the temperature of the medium | |
| RU2523208C1 (en) | Microcontroller adc with transient process in rc circuit | |
| RU2718597C1 (en) | Method for monitoring temperature of electromagnet winding and device for its implementation | |
| US20020084905A1 (en) | Method and apparatus for periodically sampling computer system device temperature |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |