CN110134055B - Self-protection heating circuit, beauty instrument, and line fault detection method and device - Google Patents
Self-protection heating circuit, beauty instrument, and line fault detection method and device Download PDFInfo
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- CN110134055B CN110134055B CN201910539914.8A CN201910539914A CN110134055B CN 110134055 B CN110134055 B CN 110134055B CN 201910539914 A CN201910539914 A CN 201910539914A CN 110134055 B CN110134055 B CN 110134055B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/28—Testing of electronic circuits, e.g. by signal tracer
- G01R31/282—Testing of electronic circuits specially adapted for particular applications not provided for elsewhere
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/048—Monitoring; Safety
Abstract
The embodiment of the application provides a self-protection heating circuit, a beauty instrument, a line fault detection method and a line fault detection device. When the equipment works, the voltage value of the preset position in the self-protection heating circuit is detected firstly, and the voltage value is compared with the preset voltage value to judge whether the self-protection heating circuit breaks down. Therefore, the circuit connection of the self-protection heating circuit is normal, and all elements have no faults, the device using the self-protection heating circuit is prevented from being out of control due to circuit faults, and the personal safety of a user is guaranteed.
Description
Technical Field
The application relates to the field of circuits, in particular to a self-protection heating circuit, a beauty instrument, a line fault detection method and a line fault detection device.
Background
Most of the existing heating devices generate heat through heating sheets, and the principle of the existing heating devices is that current passes through a conductor, so that the conductor generates heat under the action of the current. In order to control the temperature, a circuit including a temperature sensitive resistor is often used to detect the temperature, and the current is adjusted according to the detected temperature to reach the required target temperature.
The structure of the mode is simple, the cost is low, but the following problems exist: because the resistance value of the temperature-sensitive resistor is detected by software to control the temperature, once the software is in error, the temperature is not controlled any more, and scalding can be caused to a user. Therefore, an extra circuit is needed for runaway protection, and due to the manufacturing process, the service life or external physical impact and the like, the extra circuit cannot protect a heating circuit in heating equipment once the extra circuit fails, so that personal injury is easily brought to a user.
Disclosure of Invention
To overcome at least one of the deficiencies in the prior art, it is an object of the present application to provide a self-protected heating circuit comprising a controller, a comparator, a detection circuit and a heating circuit.
The detection circuit comprises a divider resistor and a temperature-sensitive resistor, the divider resistor and the temperature-sensitive resistor are connected in series between a grounding end and a power supply end, and the voltage value of the power supply end is controlled by the controller.
The heating circuit comprises a heating element and a switch element for controlling the heating element, and the controlled end of the switch element is electrically connected with the output end of the comparator.
The first input end of the comparator is electrically connected between the voltage dividing resistor and the temperature-sensitive resistor, the second input end of the comparator is connected with the reference voltage input end, and the controller compares the voltage value between the first input end and the second input end and outputs a control signal to the switch piece according to the comparison result.
The controller is electrically connected with the voltage-dividing resistor and the temperature-sensitive resistor through the first pin and is electrically connected with the output end of the comparator through the second pin, and the controller is used for acquiring the working state of the self-protection heating circuit.
Optionally, the temperature sensitive resistor is a negative temperature coefficient thermistor.
Optionally, the switch is a Metal Oxide Semiconductor Field Effect Transistor (MOSFET) tube.
Another object of an embodiment of the present application is to provide a line fault detection method applied to a controller of the self-protection heating circuit, including:
and acquiring an actually measured voltage value of a preset position of the self-protection heating circuit, wherein the preset position comprises the power supply end, a first connecting position of the first pin and the self-protection heating circuit and a second connecting position of the second pin and the self-protection heating circuit.
And comparing the measured voltage value with a preset voltage value, and if the measured voltage value meets a preset condition, outputting the information that the self-protection heating circuit breaks down.
Optionally, the preset voltage value includes voltage values corresponding to a plurality of fault types, and the method further includes:
and comparing the measured voltage value with the preset voltage value to obtain the fault type of the self-protection heating circuit.
Optionally, if the voltage of the power supply terminal is a first voltage value, the voltage of the first connection position is a second voltage value, and the voltage of the second connection position is a third voltage value; the first voltage value is larger than a third voltage value, and the second voltage value is between the first voltage value and the third voltage value.
The step of obtaining the real measured voltage value of the preset position of the self-protection heating circuit comprises the following steps:
and adjusting the voltage of the power supply end to the third voltage value to obtain the voltage values of the first connection position and the second connection position.
The step of comparing the measured voltage value with the preset voltage value to obtain the fault type of the self-protection heating circuit comprises the following steps:
and if the voltages of the first connection position and the second connection position are both the third voltage value, the comparator is damaged and outputs a low level.
Optionally, the step of comparing the measured voltage value with the preset voltage value to obtain the fault type of the self-protection heating circuit further includes:
and if the voltage of the power supply end is the first voltage value, the voltage of the first connection position is the first voltage value, and the voltage of the second connection position is the third voltage value, the temperature-sensitive resistor is opened.
And if the voltage of the power supply end is the first voltage value, the voltage of the first connection position is the third voltage value, and the voltage of the second connection position is the first voltage value, the temperature-sensitive resistor is in short circuit.
And if the voltage of the power supply end is the first voltage value, the voltage of the first connecting position is the second voltage value, and the voltage of the second connecting position is the first voltage value, the comparator is damaged and outputs a high level.
Another object of the embodiments of the present application is to provide a line fault detection apparatus, which is applied to a controller of the self-protection heating circuit, and the line fault detection apparatus includes a voltage obtaining module and a fault detection module.
The voltage obtaining module is used for obtaining an actually measured voltage value of a preset position of the self-protection heating circuit, and the preset position comprises the power supply end, a first connecting position of the first pin and the self-protection heating circuit and a second connecting position of the second pin and the self-protection heating circuit.
The fault detection module is used for comparing the actual measurement voltage value with a preset voltage value, and if the actual measurement voltage value meets a preset condition, outputting the information that the self-protection heating circuit has faults.
Optionally, the preset voltage value includes voltage values corresponding to a plurality of fault types, and the line fault detection apparatus further includes a fault determination module.
The fault determining module is used for comparing the measured voltage value with the preset voltage value to obtain the fault type of the self-protection heating circuit.
It is another object of an embodiment of the present invention to provide a cosmetic device, which includes the self-protection heating circuit, and further includes a memory, a controller, and the line fault detection device, which is located on the memory and includes one or more software functional modules executed by the controller.
Compared with the prior art, the method has the following beneficial effects:
the embodiment of the application provides a self-protection heating circuit, a beauty instrument, a line fault detection method and a line fault detection device. When the equipment works, the voltage value of the preset position in the self-protection heating circuit is detected firstly, and the voltage value is compared with the preset voltage value to judge whether the self-protection heating circuit breaks down. Therefore, the circuit connection of the self-protection heating circuit is normal, and all elements have no faults, the device using the self-protection heating circuit is prevented from being out of control due to circuit faults, and the personal safety of a user is guaranteed.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a hardware structure diagram of a self-protection heating circuit according to an embodiment of the present disclosure;
fig. 2 is a flowchart illustrating steps of a line fault detection method according to an embodiment of the present disclosure;
fig. 3 is a power-on self-test state table provided in the embodiment of the present application;
fig. 4 is a schematic structural diagram of a line fault detection apparatus according to an embodiment of the present application.
Icon: 500-a controller; 501-a power supply terminal; 502-voltage dividing resistance; 503-temperature sensitive resistor; 504-a second resistance; 505 — a first resistance; 506-a first connection location; 507-a switch member; 508-a heating element; 509-second connection location; 110-line fault detection means; 1101-a voltage acquisition module; 1102-a fault detection module; 1103 — failure determination module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is noted that the terms "first", "second", "third", and the like are used merely for distinguishing between descriptions and are not intended to indicate or imply relative importance.
Referring to fig. 1, fig. 1 is a hardware structure diagram of a self-protection heating circuit according to an embodiment of the present disclosure, where the self-protection heating circuit includes a controller 500, a comparator, a detection circuit, and a heating circuit.
The detection circuit comprises a voltage division resistor 502 and a temperature-sensitive resistor 503, the voltage division resistor 502 and the temperature-sensitive resistor 503 are connected in series between a ground terminal and a power supply terminal 501, and the voltage value of the power supply terminal 501 is controlled by the controller 500.
The controller 500 may be an integrated circuit chip having signal processing capabilities. The Processor may be a general-purpose Processor, and includes a Central Processing Unit (CPU), a Network Processor (NP), and the like; but may also be a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components. The various methods, steps, and logic blocks disclosed in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The heating circuit comprises a heating element 508 and a switch element 507 for controlling the heating element 508, wherein the controlled end of the switch element 507 is electrically connected with the output end of the comparator.
The first input terminal of the comparator is electrically connected between the voltage dividing resistor 502 and the temperature sensitive resistor 503, the second input terminal of the comparator is connected with the reference voltage input terminal, and the controller 500 compares the voltage value between the first input terminal and the second input terminal and outputs a control signal to the switch 507 according to the comparison result.
The voltage of the power supply terminal 501 is divided by the voltage dividing resistor 502 and the temperature sensitive resistor 503, wherein the voltage dividing resistor 502 is a resistor with a fixed resistance value, and the resistance value of the temperature sensitive resistor 503 changes with the change of the external temperature. Since the first input terminal of the comparator is connected between the voltage dividing resistor 502 and the temperature sensitive resistor 503, the voltage value obtained by the first input terminal of the comparator correspondingly changes with the external temperature.
The comparator compares the acquired voltage value of the first input terminal with the reference voltage acquired by the second input terminal. Since the temperature sensitive resistor 503 is used to detect the temperature of the heating element 508, when the temperature of the heating element 508 is higher than a preset threshold, the difference between the voltage at the first input terminal and the reference voltage at the second input terminal of the comparator is greater than a preset inversion threshold, so that the output terminal of the comparator is inverted. Since the controlled end of the switch 507 is electrically connected to the output section of the comparator, once the level of the output section of the comparator is inverted, the switch 507 is turned off, and the heating element 508 stops heating.
Therefore, the heating circuit is protected from a hardware level, and the situation that the heating circuit is out of control due to software operation errors, so that the heating element 508 generates too high temperature and personal injury is caused to a user is avoided.
Referring to fig. 1 again, a second input terminal of the comparator is electrically connected between the first resistor 505 and the second resistor 504. The first resistor 505 and the second resistor 504 divide the input voltage, so that the second input terminal of the comparator obtains a stable reference voltage.
Optionally, the temperature sensitive resistor 503 is a ntc thermistor, and the switching element 507 is a MOSFET transistor.
Further, referring to fig. 1 again, the logic function of the over-temperature protection is realized by the self-protection heating circuit completely through hardware. If the circuit fails, over-temperature protection cannot be realized, and the heating circuit is out of control. In order to enable the equipment comprising the self-protection heating circuit to work normally, the self-protection heating circuit needs to be self-checked after the equipment is started.
The controller 500 is electrically connected to the voltage dividing resistor 502 and the temperature sensitive resistor 503 through a first pin, and is electrically connected to the output terminal of the comparator through a second pin, so as to obtain the working state of the self-protection heating circuit.
Referring to fig. 2, fig. 2 is a flowchart illustrating steps of a line fault detection method according to an embodiment of the present disclosure, applied to a controller 500 of the self-protection heating circuit. The individual steps of the line fault detection method are explained in detail below.
Step S100, obtaining an actually measured voltage value of a preset position of the self-protection heating circuit, where the preset position includes the power supply terminal 501, the first pin, and a first connection position 506 of the self-protection heating circuit, where the first connection position 506 is located at a position where the first pin is electrically connected to the voltage-dividing resistor 502 and the temperature-sensitive resistor 503; the second pin is connected to a second connection position 509 of the self-protection heating circuit, wherein the second connection position 509 is located at a position where the second pin is electrically connected to the output terminal of the comparator.
And S200, comparing the actual measurement voltage value with a preset voltage value, and outputting the information that the self-protection heating circuit fails if the actual measurement voltage value meets the preset condition.
Optionally, the preset voltage value includes voltage values corresponding to a plurality of fault types, and the controller 500 compares the measured voltage value with the preset voltage value to obtain the fault type of the self-protection heating circuit, where the fault type includes a comparator damaged output low level, a temperature sensitive resistor open circuit, a temperature sensitive resistor short circuit, and a comparator damaged output high level.
If the voltage of the power supply terminal 501 is a first voltage value, the controller 500 obtains the voltages of the first connection position 506 and the second connection position 509, and if the voltage of the first connection position 506 is a second voltage value, the voltage of the second connection position 509 is a third voltage value; the first voltage value is greater than a third voltage value, and the second voltage value is between the first voltage value and the third voltage value.
The controller 500 adjusts the voltage of the power supply terminal 501 to the third voltage value, obtains the voltage values of the first connection position 506 and the second connection position 509, and compares the voltage values with a preset voltage value.
If the voltages at the first connection location 506 and the second connection location 509 are both at the third voltage value, the comparator fails to output a low level.
If the voltage of the power supply terminal 501 is the first voltage value, the voltage of the first connection position 506 is the first voltage value, and the voltage of the second connection position 509 is the third voltage value, the temperature sensitive resistor is open.
If the voltage of the power supply terminal 501 is the first voltage value, the voltage of the first connection position 506 is the third voltage value, and the voltage of the second connection position 509 is the first voltage value, the temperature sensitive resistor is short-circuited.
If the voltage of the power supply terminal 501 is the first voltage value, the voltage of the first connection position 506 is the second voltage value, and the voltage of the second connection position 509 is the first voltage value, the comparator is damaged and outputs a high level.
Referring to fig. 3, in one possible example, the first voltage value is 3.3V, the second voltage value is 1.65V, and the third voltage value is 0V. The comparison table of the fault type of the self-protection circuit and the preset position voltage is shown as the startup self-checking state table in fig. 3.
Referring to fig. 4, an embodiment of the present application further provides a line fault detection apparatus 110 applied to a controller of the self-protection heating circuit, where the line fault detection apparatus 110 includes a voltage obtaining module 1101 and a fault detection module 1102.
The voltage obtaining module 1101 is configured to obtain an actually measured voltage value of a preset position of the self-protection heating circuit, where the preset position includes the power supply terminal 501, a first connection position 506 where the first pin and the self-protection heating circuit are connected, and a second connection position 509 where the second pin and the self-protection heating circuit are connected.
In the present embodiment, the voltage acquisition module 1101 is configured to execute step S100 in fig. 2, and reference may be made to the detailed description of step S100 for a detailed description of the voltage acquisition module 1101.
The fault detection module 1102 is configured to compare the measured voltage value with a preset voltage value, and if a preset condition is met, output information that the self-protection heating circuit has a fault.
In this embodiment, the failure detection module 1102 is configured to execute step S200 in fig. 2, and reference may be made to the detailed description of step S200 for a detailed description of the failure detection module 1102.
Optionally, referring to fig. 4 again, the preset voltage value includes voltage values corresponding to a plurality of fault types, and the line fault detection apparatus 110 further includes a fault determination module 1103.
The fault determining module 1103 is configured to compare the measured voltage value with the preset voltage value, and obtain a fault type of the self-protection heating circuit.
The embodiment of the present application further provides a beauty instrument, which includes the self-protection heating circuit, wherein the beauty instrument further includes a memory, a controller 500, and the line fault detection device 110, the line fault detection device 110 is located on the memory, and includes one or more software functional modules executed by the controller 500.
The Memory may be, but is not limited to, a Random Access Memory (RAM), a Read Only Memory (ROM), a Programmable Read-Only Memory (PROM), an Erasable Read-Only Memory (EPROM), an electrically Erasable Read-Only Memory (EEPROM), and the like. The memory is used for storing a program, and the controller 500 executes the program after receiving the execution instruction.
In summary, the present application provides a self-protection heating circuit, a cosmetic instrument, a line fault detection method and a device. By electrically connecting the pin of the controller 500 to the preset position of the self-protection heating circuit, when the device works, the voltage value of the preset position in the self-protection heating circuit is detected first, and the voltage value is compared with the preset voltage value to judge whether the self-protection heating circuit breaks down. Therefore, the circuit connection of the self-protection heating circuit is normal, and all elements have no faults, the device using the self-protection heating circuit is prevented from being out of control due to circuit faults, and the personal safety of a user is guaranteed.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The apparatus embodiments described above are merely illustrative, and for example, the flowchart and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments of the present application. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that, in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, functional modules in the embodiments of the present application may be integrated together to form an independent part, or each module may exist separately, or two or more modules may be integrated to form an independent part.
The functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application or portions thereof that substantially contribute to the prior art may be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is only for various embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily conceive of changes or substitutions within the technical scope of the present application, and all such changes or substitutions are included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (7)
1. A self-protection heating circuit is characterized by comprising a controller, a comparator, a detection circuit and a heating circuit;
the detection circuit comprises a voltage division resistor and a temperature-sensitive resistor, the voltage division resistor and the temperature-sensitive resistor are connected in series between a grounding end and a power supply end, and the voltage value of the power supply end is controlled by the controller;
the heating circuit comprises a heating element and a switch element for controlling the heating element, and the controlled end of the switch element is electrically connected with the output end of the comparator;
the first input end of the comparator is electrically connected between the voltage dividing resistor and the temperature-sensitive resistor, the second input end of the comparator is connected with the reference voltage input end, and the controller compares the voltage value between the first input end and the second input end and outputs a control signal to the switch piece according to the comparison result;
the controller is electrically connected with the voltage-dividing resistor and the temperature-sensitive resistor through a first pin and is electrically connected with the output end of the comparator through a second pin, and the controller is used for acquiring the working state of the self-protection heating circuit;
the controller is used for acquiring the actually measured voltage values of a power supply end in the self-protection heating circuit, a first pin at a first connecting position of the self-protection heating circuit and a second pin at a second connecting position of the self-protection heating circuit;
comparing the measured voltage value with a preset voltage value, and if a preset condition is met, outputting the information that the self-protection heating circuit has faults, wherein the preset voltage value comprises voltage values corresponding to multiple fault types;
if the voltage of the power supply end is a first voltage value, the voltage of the first connection position is a second voltage value, and the voltage of the second connection position is a third voltage value; if the first voltage value is greater than a third voltage value and the second voltage value is between the first voltage value and the third voltage value, adjusting the voltage of the power supply end to the third voltage value to obtain the voltage values of the first connection position and the second connection position;
and if the voltages of the first connection position and the second connection position are both the third voltage value, the comparator is damaged and outputs a low level.
2. The self-protected heating circuit of claim 1, wherein the temperature sensitive resistor is a negative temperature coefficient thermistor.
3. The self-protected heating circuit of claim 1, wherein the switching element is a MOSFET tube.
4. The line fault detection method is characterized by being applied to a controller of a self-protection heating circuit, wherein the self-protection heating circuit further comprises a comparator, a detection circuit and a heating circuit, the detection circuit comprises a divider resistor and a temperature-sensitive resistor, the divider resistor and the temperature-sensitive resistor are connected in series between a grounding end and a power supply end, and the voltage value of the power supply end is controlled by the controller;
the heating circuit comprises a heating element and a switch element for controlling the heating element, and the controlled end of the switch element is electrically connected with the output end of the comparator;
the first input end of the comparator is electrically connected between the voltage dividing resistor and the temperature-sensitive resistor, the second input end of the comparator is connected with the reference voltage input end, and the controller compares the voltage value between the first input end and the second input end and outputs a control signal to the switch piece according to the comparison result;
the controller is electrically connected with the voltage-dividing resistor and the temperature-sensitive resistor through a first pin and is electrically connected with the output end of the comparator through a second pin, and the controller is used for acquiring the working state of the self-protection heating circuit;
the method comprises the following steps:
acquiring actually measured voltage values of a power supply end, a first pin at a first connecting position of the self-protection heating circuit and a second pin at a second connecting position of the self-protection heating circuit in the self-protection heating circuit;
comparing the measured voltage value with a preset voltage value, and if a preset condition is met, outputting the information that the self-protection heating circuit has faults, wherein the preset voltage value comprises voltage values corresponding to multiple fault types;
if the voltage of the power supply end is a first voltage value, the voltage of the first connection position is a second voltage value, and the voltage of the second connection position is a third voltage value; if the first voltage value is greater than a third voltage value and the second voltage value is between the first voltage value and the third voltage value, adjusting the voltage of the power supply end to the third voltage value to obtain the voltage values of the first connection position and the second connection position;
and if the voltages of the first connection position and the second connection position are both the third voltage value, the comparator is damaged and outputs a low level.
5. The line fault detection method of claim 4, wherein the method further comprises:
if the voltage of the power supply end is the first voltage value, the voltage of the first connection position is the first voltage value, and the voltage of the second connection position is the third voltage value, the temperature-sensitive resistor is opened;
if the voltage of the power supply end is the first voltage value, the voltage of the first connection position is the third voltage value, and the voltage of the second connection position is the first voltage value, the temperature-sensitive resistor is in short circuit;
and if the voltage of the power supply end is the first voltage value, the voltage of the first connecting position is the second voltage value, and the voltage of the second connecting position is the first voltage value, the comparator is damaged and outputs a high level.
6. The line fault detection device is characterized by being applied to a controller of a self-protection heating circuit, wherein the self-protection heating circuit further comprises a comparator, a detection circuit and a heating circuit, the detection circuit comprises a divider resistor and a temperature-sensitive resistor, the divider resistor and the temperature-sensitive resistor are connected in series between a grounding end and a power supply end, and the voltage value of the power supply end is controlled by the controller;
the heating circuit comprises a heating element and a switch element for controlling the heating element, and the controlled end of the switch element is electrically connected with the output end of the comparator;
the first input end of the comparator is electrically connected between the voltage dividing resistor and the temperature-sensitive resistor, the second input end of the comparator is connected with the reference voltage input end, and the controller compares the voltage value between the first input end and the second input end and outputs a control signal to the switch piece according to the comparison result;
the controller is electrically connected with the voltage-dividing resistor and the temperature-sensitive resistor through a first pin and is electrically connected with the output end of the comparator through a second pin, and the controller is used for acquiring the working state of the self-protection heating circuit;
the line fault detection device comprises a voltage acquisition module and a fault detection module;
the voltage acquisition module is used for acquiring an actually measured voltage value of a power supply end in the self-protection heating circuit, a first pin at a first connecting position of the self-protection heating circuit and a second pin at a second connecting position of the self-protection heating circuit;
the fault detection module is used for comparing the measured voltage value with a preset voltage value, and outputting fault information of the self-protection heating circuit if a preset condition is met, wherein the preset voltage value comprises voltage values corresponding to multiple fault types;
if the voltage of the power supply end is a first voltage value, the voltage of the first connection position is a second voltage value, and the voltage of the second connection position is a third voltage value; if the first voltage value is greater than a third voltage value and the second voltage value is between the first voltage value and the third voltage value, adjusting the voltage of the power supply end to the third voltage value to obtain the voltage values of the first connection position and the second connection position;
and if the voltages of the first connection position and the second connection position are both the third voltage value, the comparator is damaged and outputs a low level.
7. A beauty instrument is characterized by comprising a self-protection heating circuit, wherein the self-protection heating circuit comprises a controller, a comparator, a detection circuit and a heating circuit;
the detection circuit comprises a voltage division resistor and a temperature-sensitive resistor, the voltage division resistor and the temperature-sensitive resistor are connected in series between a grounding end and a power supply end, and the voltage value of the power supply end is controlled by the controller;
the heating circuit comprises a heating element and a switch element for controlling the heating element, and the controlled end of the switch element is electrically connected with the output end of the comparator;
the first input end of the comparator is electrically connected between the voltage dividing resistor and the temperature-sensitive resistor, the second input end of the comparator is connected with the reference voltage input end, and the controller compares the voltage value between the first input end and the second input end and outputs a control signal to the switch piece according to the comparison result;
the controller is electrically connected with the voltage-dividing resistor and the temperature-sensitive resistor through a first pin and is electrically connected with the output end of the comparator through a second pin, and the controller is used for acquiring the working state of the self-protection heating circuit;
the controller is configured to perform the line fault detection method of any one of claims 4-5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910539914.8A CN110134055B (en) | 2019-06-21 | 2019-06-21 | Self-protection heating circuit, beauty instrument, and line fault detection method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910539914.8A CN110134055B (en) | 2019-06-21 | 2019-06-21 | Self-protection heating circuit, beauty instrument, and line fault detection method and device |
Publications (2)
| Publication Number | Publication Date |
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| CN110134055A CN110134055A (en) | 2019-08-16 |
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| CN110553747A (en) * | 2019-08-30 | 2019-12-10 | 华为技术有限公司 | device, method and system for detecting thermal runaway of electrical equipment |
| CN111323662A (en) * | 2020-02-14 | 2020-06-23 | 威马智慧出行科技（上海）有限公司 | Heater flameout detection circuit and detection method thereof |
| CN113721490B (en) * | 2021-09-06 | 2024-01-02 | 上海唯美德科科技有限公司 | Anti-aging tightening equipment system and method |
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