Protection system of heating device and breathing machine
By designing the protection system of processor, protection circuit and power supply control circuit in the heating device of the ventilator, the problem of high NTC cost in the prior art is solved, effective protection of the heating device is achieved, and the risk of over-temperature scalding is reduced and product cost.
Patent Information
- Application Number
- CN202420389195.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-29
- Publication Date
- 2025-02-21
- Estimated Expiration
- 2034-02-28
AI Technical Summary
In order to reduce the risk of overtemperature scalding in existing ventilators, NTC is usually placed in the heating device, resulting in high product costs and insufficient market competitiveness.
Design a protection system for heating devices, including processor, protection circuit and power supply control circuit. By switching the processor state of the processor, the on-off of the protection circuit and power supply control circuit, the switching adjustment of the heating device is realized to avoid processor failures. Continuous heating resulting in.
It effectively reduces the risk of overtemperature scalding caused by processor failure, and reduces the manufacturing cost of products and improves market competitiveness by replacing NTC.
Smart Images
Figure CN222510606U_ABST
Abstract
Description
Technical Field
[0001] The present application belongs to the technical field of ventilators, and specifically relates to a protection system for a heating device and a ventilator. Background Art
[0002] When patients use a ventilator for a long time, their comfort level decreases due to dry air. A ventilator equipped with a humidifier can greatly improve the patient's comfort level.
[0003] In the prior art, when a patient uses a ventilator with a humidifier, the temperature difference between the inner and outer walls of the breathing tube will cause condensation to form in the breathing tube as the ambient temperature and humidity change. In order to avoid or reduce condensation, a heating device is usually built into the breathing tube. Since the breathing tube is in contact with the human body, there are safety issues such as overheating, burns, and fires caused by circuit failure or abnormality of the heating device. In order to reduce the risk of overheating, it is common to insert an NTC (thermistor) into the breathing tube to reduce the risk of burns.
[0004] However, products that use NTC implants to reduce the risk of overheating and scalding are relatively expensive and lack market competitiveness. Utility Model Content
[0005] The purpose of the embodiments of the present application is to provide a protection system for a heating device and a ventilator, which can solve the problem of high product costs in the prior art in order to reduce the risk of over-temperature burns.
[0006] In order to solve the above technical problems, this application is implemented as follows:
[0007] In a first aspect, an embodiment of the present application provides a protection system for a heating device, which is used to control and protect the heating device, and includes a processor, a protection circuit and a power supply control circuit. The power supply control circuit is connected to a power supply, and the processor, the protection circuit and the power supply control circuit are connected in series. The processor and the protection circuit are connected to control the on and off of the power supply control circuit, and the power supply control circuit is electrically connected to the heating device; wherein the processor includes a first state and a second state, and when the processor is in the first state, the protection circuit is turned on; when the processor is in the second state, the protection circuit is turned off.
[0008] In an embodiment of the present application, the processor is configured to output a signal to the protection circuit so that the protection circuit works, and the protection circuit is controlled to control the on and off of the power supply control circuit to realize the switch adjustment of the heating device. Specifically, the processor includes a first state and a second state. In practical applications, when the processor works normally, it is in the first state, the protection circuit is turned on, and the power supply control circuit works, so as to realize the normal operation of the heating device. When the processor fails, it is in the second state, the protection circuit is disconnected, the power supply control circuit no longer works, and the heating device cannot work. Among them, the power supply can be a mains power supply, one end of the power supply is a live wire, and the other end of the power supply is a neutral wire. Of course, the power supply can also be other AC and DC power supplies, which are not limited here. In an embodiment of the present application, the processor state is detected by the protection circuit. When the processor is in the first state, the protection circuit and the power supply control circuit are turned on, and the heating device works normally. When the processor is in the second state, the protection circuit is disconnected, the power supply control circuit at the back end stops working, and the heating device cannot work. By setting the protection circuit and the power supply control circuit, the heating device can be effectively protected, which has the function of preventing the heating device from continuing to heat due to the failure of the processor, and reducing the risk of overheating and scalding caused by the user. In addition, by the design of the protection circuit and the power supply control circuit. It also reduces the manufacturing cost of the product and has good application value.
[0009] On the second aspect, an embodiment of the present application provides a ventilator, which includes a heating device protection system as described above. By setting a protection circuit and a power supply control circuit, protection of the heating device is achieved, reducing the risk of over-temperature burns to the user caused by continuous heating of the heating device due to continuous output of a high level by a processor failure. Furthermore, by setting a protection circuit instead of inserting an NTC in the heating device, it also has the beneficial effect of reducing the cost of the ventilator and improving the competitiveness of the product. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] Figure 1 is a schematic diagram of the structure of the protection system of the heating device in the embodiment of the present application;
[0011] Figure 2 It is a structural schematic diagram of a protection control circuit in an embodiment of the present application;
[0012] Figure 3 It is a structural schematic diagram of another protection control circuit in an embodiment of the present application.
[0013] Description of reference numerals:
[0014] 1. Processor; 2. Heating device; 3. Protection circuit; 4. Power supply control circuit; 41. First control subcircuit; 42. Second control subcircuit; 5. Sampling circuit; R1. First resistor; R2. Second resistor; C1. First capacitor; Q1. First triode; Q2. Second triode; D1. First diode; R3. Third resistor; R4. Fourth resistor; M1. MOS tube; DZ1. First bidirectional TVS voltage regulator tube; QM1. Dual MOS tube chip; R5. Fifth resistor; R6. Sixth resistor; DZ2. Second bidirectional TVS voltage regulator tube; R7. Seventh resistor; R8. Eighth resistor; DZ3. Third bidirectional TVS voltage regulator tube; R9. Ninth resistor; R10. Tenth resistor. DETAILED DESCRIPTION
[0015] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0016] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.
[0017] The protection system of the heating device and the ventilator provided in the embodiments of the present application are described in detail below with reference to specific embodiments and their application scenarios in conjunction with the accompanying drawings.
[0018] See also Figures 1 to 3 An embodiment of the present application provides a protection system for a heating device, which is used to control and protect a heating device 2, and includes a processor 1, a protection circuit 3 and a power supply control circuit 4. The power supply control circuit 4 is connected to a power supply, the processor 1, the protection circuit 3 and the power supply control circuit 4 are connected in series, the processor 1 and the protection circuit 3 are connected to control the on and off of the power supply control circuit 4, and the power supply control circuit 4 is electrically connected to the heating device 2; wherein the processor 1 has a first state and a second state, and when the processor 1 is in the first state, the protection circuit 3 is turned on; when the processor 1 is in the second state, the protection circuit 3 is turned off.
[0019] In the embodiment of the present application, the processor 1 is configured to output a signal to the protection circuit 3 so that the protection circuit 3 works, and the protection circuit 3 is controlled to control the on and off of the power supply control circuit 4 to realize the switch adjustment of the heating device 2. Specifically, the processor 1 has a first state and a second state. In practical applications, when the processor 1 works normally, it is in the first state, the protection circuit 3 is turned on, and the power supply control circuit 4 works, so as to realize the normal operation of the heating device 2. When the processor 1 fails, it is in the second state, the protection circuit 3 is disconnected, the power supply control circuit 4 no longer works, and the heating device 2 cannot work. Among them, the power supply can be a mains power supply, one end of the power supply is a live wire, and the other end of the power supply is a neutral wire. Of course, the power supply can also be other AC and DC power supplies, which are not limited here. In the embodiment of the present application, the state of the processor 1 is detected by the protection circuit 3. When the processor 1 is in the first state, the protection circuit 3 and the power supply control circuit 4 are turned on, and the heating device 2 works normally. When the processor 1 is in the second state, the protection circuit 3 is disconnected, the power supply control circuit 4 at the rear end stops working, and the heating device 2 cannot work. By providing the protection circuit 3 and the power supply control circuit 4, the heating device 2 can be effectively protected, and the heating device 2 can be prevented from continuing to heat due to a failure of the processor 1, thereby reducing the risk of overheating and scalding the user. In addition, the design of the protection circuit 3 and the power supply control circuit 4 also reduces the manufacturing cost of the product, which has good application value.
[0020] It should be noted that the heating device 2 may be a heating pipeline or another structure that can be used for heating. This embodiment does not impose any limitation on the specific structure of the heating device 2.
[0021] It should also be noted that the processor 1 can be a common 8-bit / 16-bit / 32-bit / 64-bit single-chip microcomputer on the market, or a microcontroller and its peripheral circuits. This embodiment does not impose any limitation on the specific composition of the processor 1.
[0022] Optionally, in an embodiment of the present application, the processor 1 includes a PWM output signal module, the PWM output signal module is connected to the protection circuit 3, and the PWM output signal module is used to output a PWM signal; when the processor 1 is in a first state, the PWM signal is output according to a target frequency; when the processor 1 is in a second state, the PWM signal is output according to a non-target frequency.
[0023] In the embodiment of the present application, the PWM output signal module continuously outputs a PWM signal to the back end. The PWM signal is equivalent to outputting the required waveform (including shape and amplitude) by adjusting the width of a series of pulses, and controlling the output power by adjusting the duty cycle to control the temperature of the heating device 2. The specific temperature is obtained by quantitative calculation and a large number of experiments to obtain the relationship between the duty cycle and the temperature. In practical applications, when the processor 1 is in the first state, that is, when the processor 1 works normally, the PWM signal is output according to the target power, and the target power is the output frequency of the PWM signal corresponding to the temperature required by the heating device 2. When the PWM signal is output according to the target power, the protection circuit 3 and the power supply control circuit 4 are turned on, and the heating device 2 works normally. When the processor 1 is in the second state, that is, when the processor 1 fails, the PWM signal is output according to the non-target power, and the non-target power exceeds the range of the target power, which can be higher than the target power or lower than the target power. This embodiment does not make any restrictions on this. When the PWM signal is output according to the non-target power, the protection circuit 3 is disconnected, the power supply control circuit 4 of the back end stops working, and the heating device 2 cannot work either, which has the beneficial effect of preventing the heating device 2 from being continuously heated due to the failure of the processor 1.
[0024] It should be noted that the above PWM signal realizes external control through pulse width modulation, and can also output pulses in the form of timing counting.
[0025] Optionally, in an embodiment of the present application, the protection circuit 3 includes a first resistor R1, a second resistor R2, a first capacitor C1, a first transistor Q1, a second transistor Q2 and a first diode D1; one end of the first resistor R1 is connected to the PWM output signal module, the other end of the first resistor R1 is respectively connected to the first diode D1, the second resistor R2 and the first transistor Q1, the other end of the first diode D1 and the other end of the second resistor R2 are connected to the first capacitor C1, the other end of the first capacitor C1 is connected to the second transistor Q2, and the first transistor Q1 and the second transistor Q2 are connected in series, and the first transistor Q1 is connected to the power supply control circuit 4; wherein, when the processor 1 is in the first state, the protection circuit 3 is turned on; when the processor 1 is in the second state, the protection circuit 3 is turned off.
[0026] In an embodiment of the present application, when the processor 1 is in the first state, the processor 1 outputs a PWM signal to the back end, and at this time, the PWM signal is output at the target power. When the output is high level, the first transistor Q1 is charged by the first capacitor C1 due to the input high level, and at this time, the second transistor Q2 is in a low conduction state. In a short time, the second transistor Q2 is turned on at a low level, and the first transistor Q1 is turned on at a high level, and a low level is output to the back-end power supply control circuit 4, and the power supply control circuit 4 is turned on, thereby supplying power to the heating device 2. When the output is low level, the charge charged into the first capacitor C1 at a high level flows out through the first diode D1, resetting the protection circuit 3.
[0027] When the processor 1 is in the first state, that is, when the processor 1 fails, the processor 1 outputs a PWM signal to the back end, and at this time, the PWM signal is output at a non-target power. Specifically, when the high level is continuously output, the first capacitor C1 is charged so that the potential at the upper end of the first capacitor C1 increases, causing the second transistor Q2 to be turned off, the power supply control circuit 4 no longer works, and the heating device 2 also cannot work. When the low level is continuously output, the first transistor Q1 is turned off, the power supply control circuit 4 no longer works, and the heating device 2 also cannot work.
[0028] It should be noted that the protection circuit 3 is a timing circuit composed of a resistor, a capacitor, a diode and a transistor, and this part can also be directly replaced by a timer.
[0029] Optionally, in an embodiment of the present application, the power supply control circuit 4 includes a third resistor R3, a fourth resistor R4, a MOS tube M1 and a first bidirectional TVS voltage regulator DZ1, the third resistor R3 and the first bidirectional TVS voltage regulator DZ1 are connected in parallel, one end of the fourth resistor R4 is connected to the protection circuit 3, the other end of the fourth resistor R4 is connected to the third resistor R3, and the first bidirectional TVS voltage regulator DZ1 is connected to the heating device 2.
[0030] In the embodiment of the present application, when the processor 1 is in the first state, the power supply control circuit 4 is turned on. Specifically, the protection circuit 3 outputs a low level to the back-end power supply control circuit 4, and the third resistor R3, the fourth resistor R4, the MOS tube M1 and the first bidirectional TVS voltage regulator DZ1 are turned on, and the first bidirectional TVS voltage regulator DZ1 is connected to the heating device 2, thereby supplying power to the heating circuit.
[0031] It should be noted that, in the power supply control circuit 4 in the embodiment of the present application, the use of the MOS tube M1 can meet the working requirements of the power supply control circuit 4, but when the MOS tube M1 is broken down, timely remedy cannot be performed.
[0032] Optionally, in an embodiment of the present application, the power supply control circuit 4 includes a dual MOS tube chip QM1, a first control sub-circuit 41 and a second control sub-circuit 42, the first control sub-circuit 41 and the second control sub-circuit 42 are connected in parallel, and one end of the first control sub-circuit 41 and one end of the second control sub-circuit 42 are both connected to the dual MOS tube chip QM1; wherein the other end of the first control sub-circuit 41 and the other end of the second control sub-circuit 42 are both connected to the protection circuit 3, and the dual MOS tube chip QM1 is connected to the heating device 2.
[0033] In the embodiment of the present application, the dual MOS transistor chip QM1 is a chip with two MOS transistors M1 connected in series. When one of the MOS transistors M1 is broken down, the other MOS transistor M1 can still control the heating device 2. When the processor 1 is in the first state, the power supply control circuit 4 is turned on. Specifically, the protection circuit 3 outputs a low level to the back-end power supply control circuit 4, and the first sub-circuit and the second sub-circuit are both turned on with the dual MOS transistor chip QM1, thereby supplying power to the heating circuit.
[0034] Optionally, in an embodiment of the present application, the first control subcircuit 41 includes a fifth resistor R5, a sixth resistor R6 and a second bidirectional TVS voltage regulator DZ2, the fifth resistor R5 and the second bidirectional TVS voltage regulator DZ2 are connected in parallel, one end of the sixth resistor R6 is connected to the protection circuit 3, the other end of the sixth resistor R6 is connected to the fifth resistor R5, and the second bidirectional TVS voltage regulator DZ2 is connected to the dual MOS tube chip QM1.
[0035] In the embodiment of the present application, specifically, the protection circuit 3 outputs a low level to the back-end power supply control circuit 4. Since the fifth resistor R5 and the sixth resistor R6 have a voltage dividing effect, there is a voltage difference at both ends of the fifth resistor R5. The second bidirectional TVS voltage regulator DZ2 is a bidirectional TVS voltage regulator. There is a voltage difference at both ends of the pins S1 and G1 in the dual MOS tube chip QM1, so that it is turned on, that is, the first sub-circuit is turned on, thereby powering the heating pipeline.
[0036] Optionally, in an embodiment of the present application, the second control subcircuit 42 includes a seventh resistor R7, an eighth resistor R8 and a third bidirectional TVS voltage regulator DZ3, the seventh resistor R7 and the third bidirectional TVS voltage regulator DZ3 are connected in parallel, one end of the eighth resistor R8 is connected to the protection circuit 3, the other end of the eighth resistor R8 is connected to the seventh resistor R7, and the third bidirectional TVS voltage regulator DZ3 is connected to the dual MOS tube chip QM1.
[0037] In the embodiment of the present application, similarly, since the seventh resistor R7 and the eighth resistor R8 have a voltage dividing effect, there is a voltage difference across the seventh resistor R7, the third bidirectional TVS voltage regulator DZ3 is also a bidirectional TVS voltage regulator, and there is a voltage difference across S2 and G2 in the dual MOS tube chip QM1, so that it is turned on, that is, the first sub-circuit is turned on, thereby supplying power to the heating circuit.
[0038] Optionally, in the embodiment of the present application, the protection system of the heating device further includes a sampling circuit 5, and the processor 1, the sampling circuit 5 and the heating device 2 are connected in series.
[0039] In the embodiment of the present application, the sampling circuit 5 is configured to collect the temperature signal of the heating device 2, one end of the sampling circuit 5 is connected to the processor 1, and the other end of the sampling circuit 5 is connected to the heating device 2. Specifically, the sampling circuit 5 collects the temperature of the heating device 2 and the output power of the PWM signal, and feeds the collected signal back to the processor 1 for judgment. Further, when the processor 1 is in the first state, the PWM signal is input to the protection circuit 3. At this time, the signal collected by the collection circuit is the output power of the PWM signal, which is used to judge whether the power provided by the power supply control circuit 4 to the heating device 2 meets the requirements. When the processor 1 continuously inputs a high level to the protection circuit 3, but the duration of the high level is not long enough to turn off the second transistor Q2, the signal collected by the collection circuit is the signal of the heating device 2, which is used to judge whether the temperature of the heating device 2 is normal.
[0040] Optionally, in an embodiment of the present application, the sampling circuit 5 includes a signal acquisition device, a ninth resistor R9 and a tenth resistor R10, the ninth resistor R9 and the tenth resistor R10 are connected in parallel, one end of the ninth resistor R9 is connected to the heating device 2, and the signal acquisition device is respectively connected to the ninth resistor R9 and the heating device.
[0041] In the embodiment of the present application, the signal acquisition device is configured to acquire the temperature of the heating device 2 or the output power of the PWM signal. Further, in order to enhance the reliability of the heating device 2, the protection circuit 3 and the power supply control circuit 4, a ninth resistor R9 and a tenth resistor R10 are added to the interface of the heating device 2 to detect the potential change of the upper end of the ninth resistor R9 and the potential change of the upper end of the tenth resistor R10. On the one hand, it can be detected whether the heating device 2 is normally connected to the protection circuit 3 and the power supply control circuit 4, and whether the heating device 2 is short-circuited or open-circuited. On the other hand, the resistance wire of the heating device 2 will change due to the change in temperature, and the temperature of the heating device 2 can be judged by detecting the potential of the ninth resistor R9 and the potential of the tenth resistor R10.
[0042] Optionally, in an embodiment of the present application, a ventilator is also provided, comprising a protection system for the heating device as described above.
[0043] In an embodiment of the present application, the ventilator includes a protection system for the heating device as described above. By setting a protection circuit 3 and a power supply control circuit 4, protection of the heating device 2 is achieved, reducing the risk of overheating and scalding to the user due to continuous heating of the heating device 2 caused by a processor 1 continuously outputting a high level due to a failure. Furthermore, by setting a protection circuit 3 and a power supply control circuit 4, the NTC can be replaced in the heating device 2, which also has the beneficial effect of reducing the cost of the ventilator and improving the competitiveness of the product.
[0044] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.
[0045] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.
Claims
1. A protection system for a heating device, for controlling and protecting a heating device (2), characterized in that: The device comprises a processor (1), a protection circuit (3) and a power supply control circuit (4), wherein the power supply control circuit (4) is connected to a power supply, the processor (1), the protection circuit (3) and the power supply control circuit (4) are connected in series, the processor (1) and the protection circuit (3) are connected to control the on and off of the power supply control circuit (4), and the power supply control circuit (4) is electrically connected to the heating device (2); The processor (1) includes a first state and a second state. When the processor (1) is in the first state, the protection circuit (3) is turned on; when the processor (1) is in the second state, the protection circuit (3) is turned off.
2. The protection system for a heating device according to claim 1, characterized in that: The processor (1) comprises a PWM output signal module, the PWM output signal module is connected to the protection circuit (3), and the PWM output signal module is used to output a PWM signal; When the processor (1) is in the first state, the PWM signal is output according to the target power; when the processor (1) is in the second state, the PWM signal is output according to the non-target power.
3. The protection system for a heating device according to claim 2, characterized in that: The protection circuit (3) comprises a first resistor (R1), a second resistor (R2), a first capacitor (C1), a first transistor (Q1), a second transistor (Q2) and a first diode (D1); One end of the first resistor (R1) is connected to the PWM output signal module, the other end of the first resistor (R1) is respectively connected to the first diode (D1), the second resistor (R2) and the first transistor (Q1), the other end of the first diode (D1) and the other end of the second resistor (R2) are connected to the first capacitor (C1), the other end of the first capacitor (C1) is connected to the second transistor (Q2), the first transistor (Q1) and the second transistor (Q2) are connected in series, and the first transistor (Q1) is connected to the power supply control circuit (4); Wherein, when the processor (1) is in the first state, the protection circuit (3) is turned on; when the processor (1) is in the second state, the protection circuit (3) is turned off.
4. The protection system for a heating device according to claim 3, characterized in that: The power supply control circuit (4) comprises a third resistor (R3), a fourth resistor (R4), a MOS tube (M1) and a first bidirectional TVS voltage regulator tube (DZ1); the third resistor (R3) and the first bidirectional TVS voltage regulator tube (DZ1) are connected in parallel; one end of the fourth resistor (R4) is connected to the protection circuit (3); the other end of the fourth resistor (R4) is connected to the third resistor (R3); and the first bidirectional TVS voltage regulator tube (DZ1) is connected to the heating device (2).
5. The protection system for a heating device according to claim 3, characterized in that: The power supply control circuit (4) comprises a dual MOS tube chip (QM1), a first control subcircuit (41) and a second control subcircuit (42), the first control subcircuit (41) and the second control subcircuit (42) being connected in parallel, and one end of the first control subcircuit (41) and one end of the second control subcircuit (42) being connected to the dual MOS tube chip (QM1); The other end of the first control subcircuit (41) and the other end of the second control subcircuit (42) are both connected to the protection circuit (3), and the dual MOS tube chip (QM1) is connected to the heating device (2).
6. The protection system for a heating device according to claim 5, characterized in that: The first control subcircuit (41) comprises a fifth resistor (R5), a sixth resistor (R6) and a second bidirectional TVS voltage regulator (DZ2); the fifth resistor (R5) and the second bidirectional TVS voltage regulator (DZ2) are connected in parallel; one end of the sixth resistor (R6) is connected to the protection circuit (3); the other end of the sixth resistor (R6) is connected to the fifth resistor (R5); and the second bidirectional TVS voltage regulator (DZ2) is connected to the dual MOS tube chip (QM1).
7. The protection system for a heating device according to claim 6, characterized in that: The second control subcircuit (42) comprises a seventh resistor (R7), an eighth resistor (R8) and a third bidirectional TVS voltage regulator (DZ3); the seventh resistor (R7) and the third bidirectional TVS voltage regulator (DZ3) are connected in parallel; one end of the eighth resistor (R8) is connected to the protection circuit (3); the other end of the eighth resistor (R8) is connected to the seventh resistor (R7); and the third bidirectional TVS voltage regulator (DZ3) is connected to the dual MOS tube chip (QM1).
8. The protection system for a heating device according to any one of claims 1 to 7, characterized in that: The protection system of the heating device further comprises a sampling circuit (5), and the processor (1), the sampling circuit (5) and the heating device (2) are connected in series.
9. The protection system for a heating device according to claim 8, characterized in that: The sampling circuit (5) comprises a ninth resistor (R9) and a tenth resistor (R10), the ninth resistor (R9) and the tenth resistor (R10) are connected in parallel, and one end of the ninth resistor (R9) is respectively connected to the heating device (2) and the processor (1).
10. A ventilator, characterized in that: A protection system comprising a heating device as claimed in any one of claims 1 to 9.