A respiratory system short circuit protection circuit, breathing assistance device and method

Abstract

The application discloses a breathing system short circuit protection circuit, a breathing auxiliary device and a method, which comprise a heating loop, a heating modulation module, a temperature detection device, a protection module, a temperature detection module and a control module; one end of the heating loop is connected with the heating modulation module and a grounding end; the temperature detection device is connected with the other end of the heating loop; the protection module is connected with the temperature detection device and the temperature detection module respectively; the control module is connected with the heating modulation module and the temperature detection module respectively; and the heating modulation module is connected with the heating loop. The protection module is connected with the temperature detection device and the temperature detection module respectively, so that the connection between the temperature detection device and the temperature detection module is disconnected when a short circuit occurs, thereby realizing short circuit protection of the breathing system.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a short-circuit protection circuit for a respiratory system, a respiratory assist device, and a method. Background Technology

[0002] Current respiratory assist devices (such as ventilators) include a ventilator and a breathing tubing. The breathing tubing is connected to the patient's breathing port and the ventilator. The ventilator controls the heating temperature of the breathing tubing to provide the patient with a suitable temperature. However, at the connection between the breathing tubing and the ventilator, the ventilator may short-circuit due to the high oxygen concentration environment, causing the respiratory assist device to catch fire.

[0003] Therefore, existing technologies still need to be improved and developed. Summary of the Invention

[0004] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a short-circuit protection circuit for a respiratory system, a respiratory assist device and a method, so as to solve the problem that the respiratory assist device catches fire because the connection between the breathing tubing and the breathing host is in a high oxygen concentration environment, causing the breathing host to short-circuit.

[0005] The technical solution of the present invention is as follows:

[0006] A short-circuit protection circuit for a respiratory system includes: a heating circuit, a heating modulation module, a temperature detection device, a protection module, a temperature detection module, and a control module;

[0007] One end of the heating circuit is connected to the heating modulation module and the grounding terminal, and is used to heat the breathing tube according to the driving current output by the heating modulation module;

[0008] The temperature detection device is connected to the other end of the heating circuit and is used to detect the temperature of the heating circuit according to the detection signal output by the temperature detection module.

[0009] The protection module is connected to both the temperature sensing device and the temperature detection module, and is used to disconnect the connection between the temperature sensing device and the temperature detection module in the event of a short circuit.

[0010] The control module is connected to the heating modulation module and the temperature detection module respectively, and is used to send a first signal to the temperature detection module according to the interval period, and output a second signal to the heating modulation module when the temperature detected by the temperature detection module is lower than the rated temperature.

[0011] The temperature detection module is connected to the temperature detection device and is used to output a detection signal to the temperature detection device according to the first signal;

[0012] The heating modulation module is connected to the heating circuit and is used to output a drive current to the heating circuit according to the second signal.

[0013] In a further embodiment of the present invention, the protection module is a first fuse;

[0014] The first fuse is connected to both the temperature sensing device and the temperature sensing module, and is used to blow in the event of a short circuit to disconnect the temperature sensing device from the temperature sensing module.

[0015] A further provision of the present invention includes a first high-voltage protection unit and a second high-voltage protection unit;

[0016] The first high-voltage protection unit is connected to the heating circuit and the temperature detection device respectively, and is used to block the high-voltage signal of the heating circuit from flowing into the temperature detection device;

[0017] The second high-voltage protection unit is connected to the temperature detection module to prevent the high-voltage signal of the heating modulation module from flowing into the temperature detection module when a short circuit occurs.

[0018] In a further embodiment of the present invention, the heating modulation module includes a driving unit, a buffer unit, and a short-circuit protection unit;

[0019] The buffer unit is connected to the first power supply voltage, the control module, and the drive unit respectively, and is used to buffer the second signal, divide the first power supply voltage, and output the divided voltage signal to the drive unit.

[0020] The driving unit is connected to the heating circuit and is used to turn on according to the voltage divider signal and output driving current to the heating circuit;

[0021] The short-circuit protection unit is connected to the first power supply voltage, the driving unit, and the buffer unit respectively, and is used to disconnect the connection between the first power supply voltage and the driving unit and the buffer unit when a short circuit occurs.

[0022] In a further embodiment of the present invention, the buffer unit includes a first transistor, a second transistor, a third transistor, a first resistor, a second resistor, a third resistor, and a fourth resistor;

[0023] The base of the first transistor is connected to the control module, the emitter of the first transistor is grounded, and the collector of the first transistor is connected to one end of the first resistor and the collector of the second transistor, respectively.

[0024] The emitter of the second transistor is connected to one end of the third resistor and the emitter of the third transistor, respectively, and the base of the second transistor is connected to the base of the third transistor and the other end of the second resistor, respectively.

[0025] The collector of the third transistor is connected to the first power supply voltage, one end of the fourth resistor, and one end of the second resistor, respectively; the other end of the second resistor is connected to the other end of the first resistor; and the other end of the fourth resistor is connected to the driving unit and the other end of the third resistor, respectively.

[0026] In a further embodiment of the present invention, the driving unit includes a first switching transistor;

[0027] The gate of the first switching transistor is connected to the buffer unit, the source of the first switching transistor is connected to the short-circuit protection unit, and the drain of the first switching transistor is connected to the heating circuit.

[0028] In a further embodiment of the present invention, the short-circuit protection unit is a second fuse;

[0029] The second fuse is connected to the first power supply voltage, the drive unit, and the buffer unit respectively, and is used to disconnect the connection between the first power supply voltage and the drive unit, and disconnect the connection between the first power supply voltage and the buffer unit in the event of a short circuit.

[0030] In a further embodiment of the present invention, the temperature detection module includes a fourth transistor, a fifth transistor, and a fifth resistor;

[0031] The base of the fourth transistor is connected to the control module, the emitter of the fourth transistor is grounded, and the collector of the fourth transistor is connected to the base of the fifth transistor.

[0032] The emitter of the fifth transistor is connected to the second power supply voltage, the collector of the fifth transistor is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the control module and the temperature detection device.

[0033] A respiratory assist device includes a device body, wherein a circuit board is disposed in the device body, and the circuit board is provided with a respiratory system short-circuit protection circuit as described above.

[0034] A short-circuit protection method for a respiratory system, applied to the detection circuit described above, the method comprising:

[0035] The temperature detection module and the temperature detection device perform temperature detection on the heating circuit according to a periodic interval.

[0036] When the temperature is detected to be lower than the rated temperature, the heating modulation module is controlled to heat the heating circuit.

[0037] The protection module disconnects the temperature sensing device from the temperature sensing module when a short circuit occurs.

[0038] This invention provides a short-circuit protection circuit for a respiratory system, comprising: a heating circuit, a heating modulation module, a temperature detection device, a protection module, a temperature detection module, and a control module; one end of the heating circuit is connected to the heating modulation module and a ground terminal, and is used to heat the respiratory tubing according to the driving current output by the heating modulation module; the temperature detection device is connected to the other end of the heating circuit, and is used to detect the temperature of the heating circuit according to the detection signal output by the temperature detection module; the protection module is connected to both the temperature detection device and the temperature detection module, and is used to disconnect the connection between the temperature detection device and the temperature detection module in the event of a short circuit; the control module is connected to both the heating modulation module and the temperature detection module, and is used to send a first signal to the temperature detection module at intervals, and to output a second signal to the heating modulation module when the temperature detected by the temperature detection module is lower than the rated temperature; the temperature detection module is connected to the temperature detection device, and is used to output a detection signal to the temperature detection device according to the first signal; the heating modulation module is connected to the heating circuit, and is used to output a driving current to the heating circuit according to the second signal. This invention connects the temperature detection device and the temperature detection module through a protection module, and disconnects the connection between the temperature detection device and the temperature detection module in the event of a short circuit, thereby achieving short-circuit protection for the respiratory system. Attached Figure Description

[0039] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0040] Figure 1 This is a schematic diagram of the short-circuit protection circuit for the respiratory system in this invention.

[0041] Figure 2 This is a circuit diagram of the respiratory system short-circuit protection circuit in this invention.

[0042] Figure 3 This is a circuit diagram of a two-wire heating wire used in the short-circuit protection circuit of the respiratory system in this invention.

[0043] Figure 4This is a circuit diagram of a two-wire heating wire used in the short-circuit protection circuit of the respiratory system in this invention.

[0044] Figure 5 This is a circuit diagram of the short-circuit protection circuit for the respiratory system in this invention, which uses two heating wires.

[0045] Figure 6 This is a flowchart of the respiratory system short-circuit protection method in this invention. Detailed Implementation

[0046] This invention provides a short-circuit protection circuit for a respiratory system, a respiratory assist device, and a method. To make the objectives, technical solutions, and effects of this invention clearer and more explicit, the invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0047] In the implementation methods and claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of the present invention involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0048] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0049] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0050] Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0051] Please also refer to Figures 1 to 2 The present invention provides a preferred embodiment of a short-circuit protection circuit for a respiratory system.

[0052] like Figure 1 As shown, this invention provides a short-circuit protection circuit for a respiratory system, comprising: a heating circuit 100, a heating modulation module 200, a temperature detection device 300, a protection module 400, a temperature detection module 500, and a control module 600; one end of the heating circuit 100 is connected to the heating modulation module 200 and a ground terminal, and is used to heat the breathing tubing according to the driving current output by the heating modulation module 200; the temperature detection device 300 is connected to the other end of the heating circuit 100, and is used to detect the temperature of the heating circuit 100 according to the detection signal output by the temperature detection module 500; the protection module 400 is connected to both the temperature detection device 300 and the temperature detection module 500. The control module 600 is used to disconnect the temperature detection device 300 from the temperature detection module 500 during a short circuit; the control module 600 is connected to the heating modulation module 200 and the temperature detection module 500 respectively, and is used to send a first signal to the temperature detection module 500 according to the interval period, and output a second signal to the heating modulation module 200 when the temperature detected by the temperature detection module 500 is lower than the rated temperature; the temperature detection module 500 is connected to the temperature detection device 300, and is used to output a detection signal to the temperature detection device 300 according to the second signal; the heating modulation module 200 is connected to the heating circuit 100 respectively, and is used to output a drive current to the heating circuit 100 according to the second signal.

[0053] For details, please refer to Figure 1 The respiratory system includes a breathing tubing and a ventilator. One end of the breathing tubing is connected to the patient's airway, and the other end is connected to the ventilator. The heating circuit 100 is located inside the breathing tubing. The heating modulation module 200, the control module 600, and the temperature detection module 500 are located on the ventilator. The temperature detection device 300 and the protection module 400 are integrated on a PCB board and located at the end of the breathing tubing closest to the patient.

[0054] The control module 600 is connected to the temperature detection module 500, which in turn is connected to the temperature detection device 300, which is positioned at the end of the breathing tube closest to the patient. The temperature detection device 300 is a thermistor. The temperature detection device 300 converts the patient's temperature information into a resistance value. The temperature detection module 500 then converts this resistance value into a voltage value and outputs it to the control module 600 to achieve temperature detection. The control module 600 periodically sends a first signal to the temperature detection module 500 to activate it. When the temperature detection module 500 is activated, it outputs a detection signal to the temperature detection device 300, supplying power to it to convert the temperature information into a resistance value. The temperature detection module 500 then converts this resistance value into a voltage value and outputs it to the control module 600, thus enabling temperature detection within a specified time.

[0055] The control module 600 is connected to the heating modulation module 200, which is connected to one end of the heating circuit 100. When the temperature detected by the temperature detection module 500 is lower than the rated temperature, the control module 600 outputs a second signal to control the heating modulation module 200 to output a drive current to the heating circuit 100, thereby heating the heating circuit 100 to increase the temperature of the breathing tubing. The heating circuit 100 is a heating wire, and its rated temperature is a temperature comfortable for the patient, without specific limitations.

[0056] When the respiratory system can perform temperature detection and heating functions, a short circuit may occur at the connection between the breathing tubing and the ventilator due to a high oxygen concentration environment or other reasons. This short circuit occurs at the first connection point P1 between the heating circuit 100 and the heating modulation module 200, the second connection point P2 between the heating circuit 100 and the ground terminal, and the third connection point P3 between the temperature detection module 500 and the temperature detection device 300. If the first connection point P1 and the third connection point P3 are short-circuited, the high voltage input from the heating modulation module 200 will be transmitted to the temperature detection device 300, causing the temperature detection device 300 to burn out and catch fire, thus harming the patient. Therefore, by connecting the protection module 400 to the temperature detection device 300 and the temperature detection module 500 respectively, when a short circuit occurs between the first connection point P1 and the third connection point P3, the connection between the temperature detection device 300 and the temperature detection module 500 is disconnected to prevent the temperature detection device 300 from burning out and catching fire, thereby harming the patient.

[0057] In one embodiment, the protection module 400 is a first fuse F1; the first fuse F1 is connected to the temperature detection device 300 and the temperature detection module 500 respectively, and is used to blow in the event of a short circuit to disconnect the connection between the temperature detection device 300 and the temperature detection module 500.

[0058] Specifically, such as Figure 2 As shown, one end of the first fuse F1 is connected to the temperature sensing device 300, and the other end of the first fuse F1 is connected to the temperature sensing module 500. If the first connection point P1 and the third connection point P3 are short-circuited, the first fuse F1 will blow due to excessively high voltage in the heating modulation module 200 connected to the first connection point P1, thus disconnecting the temperature sensing device 300 from the temperature sensing module 500. This prevents the temperature sensing device 300 from receiving any current, thus avoiding a fire.

[0059] In one embodiment, the respiratory system protection circuit further includes a first high-voltage protection unit 700 and a second high-voltage protection unit 800; the first high-voltage protection unit 700 is connected to the heating circuit 100 and the temperature detection device 300 respectively, and is used to block the high-voltage signal of the heating circuit 100 from flowing into the temperature detection device 300; the second high-voltage protection unit 800 is connected to the temperature detection module 500 respectively, and is used to prevent the high-voltage signal of the heating modulation module 200 from flowing into the temperature detection module 500 when a short circuit occurs.

[0060] Specifically, such as Figure 2 As shown, the first high-voltage protection unit 700 is a first diode VD1. The cathode of the first diode VD1 is connected to the heating circuit 100, and the anode of the first diode VD1 is connected to the temperature detection device 300. Since the temperature detection device 300 needs to detect the temperature of the breathing tubing near the patient, which is the temperature of the heating circuit 100, it needs to be connected to the breathing circuit. However, if the voltage of the heating circuit 100 is too high, it will burn out and catch fire if directly connected to the temperature detection device 300. Therefore, by connecting the first diode VD1 to both the heating circuit 100 and the temperature detection device 300, the high voltage input from the heating circuit 100 to the temperature detection device 300 can be prevented from burning out the temperature detection device 300 while the temperature detection device 300 can perform detection.

[0061] The second high-voltage protection unit 800 is a second diode VD2. The cathode of the second diode VD2 is connected to the protection module 400, and the anode of the second diode VD2 is connected to the temperature detection module 500. If a short circuit occurs at the first connection point P1 between the heating circuit 100 and the heating modulation module 200, and at the third connection point P3 between the temperature detection module 500 and the temperature detection device 300 (i.e., when the first connection point P1 and the third connection point P3 are short-circuited), the high-voltage signal of the heating modulation module 200 will flow into the temperature detection module 500, causing the temperature detection module 500 to burn out. Therefore, by setting the second high-voltage protection unit 800, the high-voltage signal of the heating modulation module 200 can be prevented from flowing into the temperature detection module 500 and causing the temperature detection module 500 to burn out. At the same time, it can further prevent the input voltage of the third detection terminal P8 connected to the temperature detection module from being too high and burning out the control module 600.

[0062] In one embodiment, the heating modulation module 200 includes a driving unit 220, a buffer unit 210, and a short-circuit protection unit 230. The buffer unit 210 is connected to the first power supply voltage VCC, the control module 600, and the driving unit 220, respectively, for buffering the second signal and dividing the first power supply voltage VCC, and outputting a divided voltage signal to the driving unit 220. The driving unit 220 is connected to the heating circuit 100, for conducting according to the divided voltage signal, and outputting a driving current to the heating circuit 100. The short-circuit protection unit 230 is connected to the first power supply voltage VCC, the driving unit 220, and the buffer unit 210, respectively, for disconnecting the first power supply voltage VCC from the driving unit 220 and disconnecting the first power supply voltage VCC from the buffer unit 210 during a short circuit.

[0063] Specifically, such as Figure 2 As shown, the first power supply voltage VCC is used to power the heating modulation module 200. The voltage value of the first power supply voltage VCC depends on the driving voltage of the heating circuit 100 connected to the heating modulation module 200. If the driving voltage of the heating circuit 100 is not high, the buffer unit 210 is not required. The driving unit 220 is connected to the first power supply voltage VCC, the control module 600, and the heating circuit 100 respectively. The control module 600 outputs a first signal to control the conduction time of the driving unit 220, and controls the output driving current by controlling the conduction time, thereby controlling the heating power of the heating circuit 100.

[0064] If the driving voltage of the heating circuit 100 is too high, the buffer unit 210 needs to be connected to the first power supply voltage VCC, the driving unit 220, and the control module 600 respectively. By buffering the second signal output from the output terminal P4 of the control module 600, the driving unit 220 can stably drive the heating circuit 100. The first power supply voltage VCC is also stepped down to prevent the driving unit 220 from burning out.

[0065] In one embodiment, please refer to Figure 2 The buffer unit 210 includes a first transistor Q1, a second transistor Q2, a third transistor Q3, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4. The base of the first transistor Q1 is connected to the control module 600, the emitter of the first transistor Q1 is grounded, and the collector of the first transistor Q1 is connected to one end of the first resistor R1 and the collector of the second transistor Q2. The emitter of the second transistor Q2 is connected to one end of the third resistor R3 and the emitter of the third transistor Q3, and the base of the second transistor Q2 is connected to the base of the third transistor Q3 and the other end of the second resistor R2. The collector of the third transistor Q3 is connected to the first power supply voltage VCC, one end of the fourth resistor R4, and one end of the second resistor R2. The other end of the second resistor R2 is connected to the other end of the first resistor R1. The other end of the fourth resistor R4 is connected to the driving unit 220 and the other end of the third resistor R3.

[0066] Specifically, the output terminal P4 of the control module 600 outputs a PWM wave to the base of the first transistor. The PWM wave has a high-level period and a low-level period. During the high-level period, a high level is output to the base of the first transistor Q1, turning on the first transistor Q1. Simultaneously, through the voltage division of the first resistor R1 and the second resistor R2, the second transistor Q2 is turned on, while the third transistor Q3 is turned off. After the second transistor Q2 is turned on, the voltage is further divided through the third resistor R3 and the fourth resistor R4 to turn on the driving unit 220. By delaying the turn-on time of the driving unit 220 through the third transistor Q3 and the first transistor Q1, the PWM wave can be buffered, that is, the rising edge of the PWM wave can be buffered, further eliminating the spikes caused by the voltage difference when the driving unit 220 is turned on (for example, if the power supply voltage received by the driving unit 220 is 24V, if the driving unit 220 is turned off, it will return to 0V, and if it suddenly drops from 24V to 0V, the driving unit 220 will generate a spike, so it is necessary to eliminate the spike through buffering).

[0067] In one embodiment, such as Figure 4 As shown, the buffer unit includes a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a sixth resistor R6, a first transistor Q1, a second transistor Q2, and a third transistor Q3. One end of the first resistor R1 is connected to the control module, and the other end of the first resistor R1 is connected to one end of the second resistor R2, one end of the third resistor R3, and the base of the first transistor Q1. The emitter of the first transistor Q1 is grounded. The collector of the first transistor Q1 is connected to one end of the fourth resistor R4, the base of the third transistor Q3, and the base of the second transistor Q2. The other end of the fourth resistor R4 is connected to the power supply voltage. The other end of the third resistor R3 and the emitter of the third transistor Q3 are connected to one end of the sixth resistor R6 and the emitter of the second transistor. The collector of the second transistor Q2 is grounded. The other end of the sixth resistor R6 is connected to the drive unit 220.

[0068] Specifically, the control module 600 sends a PWM wave to the base of the first transistor Q1 via its control terminal. The PWM wave has a high-level period and a low-level period. During the low-level period, a low level is output to the base of the first transistor Q1, causing Q1 to be turned off. After Q1 is turned off, the third transistor Q3 is turned on, thus turning on the driving unit 220. By delaying the turn-on time of the driving unit 220 through the third transistor Q3 and the first transistor Q1, the PWM wave can be buffered, specifically the rising edge of the PWM wave. This further eliminates the voltage spikes generated by the voltage difference when the driving unit 220 is turned on (for example, if the supply voltage received by the driving unit 220 is 24V, and the voltage drops back to 0V when the driving unit 220 is turned off, a sudden drop from 24V to 0V will cause a voltage spike in the driving unit 220, thus requiring buffering to eliminate the spike).

[0069] In one embodiment, such as Figure 2 As shown, the driving unit 220 includes a first switching transistor K1; the gate of the first switching transistor K1 is connected to the buffer unit 210, the source of the first switching transistor K1 is connected to the short-circuit protection unit 230, and the drain of the first switching transistor K1 is connected to the heating circuit 100.

[0070] Specifically, the first switching transistor K1 is a field-effect transistor (FET). When the voltage between the source and gate of the first switching transistor K1 is greater than the turn-on voltage, it will conduct, meaning current will flow out of the drain of the first switching transistor K1. Conversely, when the voltage between the source and gate of the first switching transistor K1 is less than the turn-on voltage, it will be turned off, meaning no current will flow out of the drain of the first switching transistor K1. By controlling the conduction time of the first switching transistor K1, the heating power of the heating circuit 100 connected to the drain of the first switching transistor K1 can be controlled.

[0071] In one embodiment, such as Figure 2 As shown, the driving unit 220 also includes a test resistor RX.

[0072] One end of the test resistor RX is connected to the drain of the first switching transistor and the first detection terminal P5 of the control module 600, respectively. The other end of the test resistor RX is connected to the heating circuit 100 and the second detection terminal P6 of the control module 600, respectively. By providing real-time feedback on the voltage difference between the first detection terminal P5 and the second detection terminal P6, it is determined whether the driving unit 220 is in operation, that is, whether the heating circuit 100 is heating.

[0073] In one embodiment, the short-circuit protection unit 230 is a second fuse F2; the second fuse F2 is connected to the first power supply voltage VCC, the drive unit 230 and the buffer unit 210 respectively, and is used to disconnect the connection between the first power supply voltage VCC and the drive unit 230 and the buffer unit 210 when a short circuit occurs.

[0074] Specifically, such as Figure 2 As shown, the short-circuit protection unit 230 is used to prevent short circuits between the heating circuit 100 and the first connection point P1 of the heating modulation module 200, and between the heating circuit 100 and the second connection point P2 of the ground terminal. When the first connection point P1 is short-circuited at the second connection point P2, the second fuse F2 blows, disconnecting the first power supply voltage VCC from the drive unit 230, and disconnecting the first power supply voltage VCC from the buffer unit 210, so that the heating modulation module 200 no longer outputs current, thereby preventing damage to components of the heating modulation module 200 due to short circuits.

[0075] In one embodiment, the temperature detection module 500 includes a fourth transistor Q4, a fifth transistor Q5, and a fifth resistor R5; the base of the fourth transistor Q4 is connected to the control module 600, the emitter of the fourth transistor Q4 is grounded, and the collector of the fourth transistor Q4 is connected to the base of the fifth transistor Q5; the emitter of the fifth transistor Q5 is connected to a second power supply voltage VDD, the collector of the fifth transistor Q5 is connected to one end of the fifth resistor R5, and the other end of the fifth resistor R5 is connected to both the control module 600 and the temperature detection device 300.

[0076] Specifically, such as Figure 2 As shown, the enable terminal P7 of the control module 600 outputs a high level to the base of the fourth transistor Q4, turning on the fourth transistor Q4. The fourth transistor Q4 is used to prevent the enable terminal P7 of the control module 600 from burning out due to excessively high voltage VDD, providing overvoltage protection for the control module 600. When the fourth transistor Q4 is turned on, its collector voltage is 0V (its emitter is grounded), meaning the base voltage of the fifth transistor Q5 is 0V, thus turning on the fifth transistor Q5. When the fifth transistor Q5 is turned on, current flows through the fifth resistor R5. The fifth resistor R5 is connected to the third detection terminal P8 of the control module 600 and the temperature detection device 300 respectively. The fifth resistor R5 is used to divide the second power supply voltage VDD, so that the resistance value of the temperature detection device 300 is converted into a voltage value, and the voltage value is detected through the third detection terminal P8 of the control module 600 to realize temperature detection.

[0077] In one embodiment, such as Figure 3 as well as Figure 4 As shown, the heating circuit consists of two heating wires.

[0078] Specifically, such as Figure 3As shown, one end P1 of the heating circuit 100 is connected to the heating modulation module 200, and the other end P21 of the heating circuit is connected to the ground terminal. One end P22 of the temperature detection device 300 is connected to the ground terminal, and the other end of the temperature detection device 300 is connected to the protection module. When the heating circuit is a two-wire heating element, the heating modulation module 200 heats the heating circuit 100 by connecting the heating circuit 100 to the heating modulation module 200 and the ground terminal respectively. The temperature detection device 300 is installed on the end of the breathing tube (the heating circuit) closest to the patient. By connecting one end P22 of the temperature detection device 300 to the ground terminal and the other end of the temperature detection device 300 to the protection module 400, a circuit is formed to detect the temperature at the patient end. Furthermore, by connecting the temperature detection device 300 to the protection module 400, the protection module 400 will fuse in the event of a short circuit, providing short-circuit protection for the patient end and preventing the temperature detection device 300 from catching fire due to a short circuit.

[0079] like Figure 4 As shown, one end P11 of the heating circuit 100 is connected to the driving unit 220, and the other end P21 of the heating circuit is connected to the short-circuit protection unit 230. One end P22 of the temperature sensing device 300 is connected to the ground terminal, and the other end of the temperature sensing device 300 is connected to the protection module. When the heating circuit is a two-wire heating element, the heating circuit 100 is heated by the driving unit 220 by connecting the heating circuit 100 to both the short-circuit protection unit 230 and the driving unit 220. The temperature sensing device 300 is installed on the end of the breathing tube (the heating circuit) closest to the patient. By connecting one end of the temperature sensing device 300 to the ground terminal and the other end of the temperature sensing device 300 to the protection module 400, a circuit is formed to detect the temperature at the patient end. Furthermore, the temperature detection device 300 is connected to the protection module 400 so that the protection module 400 will melt and blow in the event of a short circuit, thereby providing short circuit protection for the patient end and preventing the temperature detection device 300 from catching fire due to a short circuit.

[0080] In one embodiment, such as Figure 5 As shown, the heating circuit 100 includes a first heating wire L1 and a second heating wire L2; one end of the first heating wire L1 is connected to the temperature detection device 300, and the other end of the first heating wire L1 is connected to the heating modulation module 200; one end of the second heating wire L2 is connected to the protection module 400, and the other end of the second heating wire L2 is connected to the temperature detection module 500 and the heating modulation module 200, respectively.

[0081] Specifically, such as Figure 5 As shown, the temperature detection device 300 is disposed on the end of the breathing tube near the patient. One end of the temperature detection device 300 is connected to the first heating wire L1, which is grounded through a transistor T1. The other end of the temperature detection device 300 is connected to one end of the protection module 400, which is connected to the temperature detection module 500 to form a circuit, thereby enabling the detection of the patient's temperature through the third detection terminal P8 of the control module 600 connected to the transistor.

[0082] The heating modulation module 200 is connected to the first heating wire L1 and the second heating wire L2 respectively. The output terminal P4 of the control module 600 connected to the heating modulation module 200 outputs a high level to turn on the driving unit 220, thereby heating the first heating wire L1 and the second heating wire L2.

[0083] The protection module 400 is connected to the temperature detection device 300 so that in the event of a short circuit, the protection module 400 will fuse to provide short circuit protection for the patient end and prevent the temperature detection device 300 from catching fire due to a short circuit.

[0084] It should be noted that the temperature detection module 300 is also connected to the enable terminal P7 of the control module 600. When the enable terminal P7 of the control module 600 outputs a high level, temperature detection is performed. When the enable terminal P7 of the control module 600 outputs a low level, heating is performed by the heating modulation module 200.

[0085] The present invention also provides a respiratory assist device, including a device body, wherein a circuit board is disposed in the device body, and the circuit board is provided with a respiratory system short-circuit protection circuit as described above. Specific details are as described in an embodiment of a respiratory system short-circuit protection circuit, and will not be repeated here.

[0086] This invention also provides a method for short-circuit protection of the respiratory system, such as... Figure 5 As shown, it includes:

[0087] S100, the control module sends a first signal to the temperature detection module according to the interval period; as described in an embodiment of a short-circuit protection circuit for a respiratory system, it will not be repeated here.

[0088] S200, the temperature detection module outputs a detection signal to the temperature detection device according to the first signal; as described in an embodiment of a short-circuit protection circuit for a respiratory system, it will not be repeated here.

[0089] S300: The temperature detection device detects the temperature of the heating circuit based on the detection signal. This is specifically illustrated in an embodiment of a short-circuit protection circuit for a respiratory system, and will not be repeated here.

[0090] S400: When the temperature detected by the temperature detection module is lower than the rated temperature, the control module outputs a second signal to the heating modulation module; as described in an embodiment of a short-circuit protection circuit for a respiratory system, it will not be repeated here.

[0091] S500, the heating modulation module outputs a drive current to the heating circuit according to the second signal; specifically as described in an embodiment of a short-circuit protection circuit for a respiratory system, which will not be repeated here.

[0092] S600, the heating circuit heats the breathing tube according to the driving current; as described in an embodiment of a short-circuit protection circuit for a breathing system, it will not be repeated here.

[0093] S700: The protection module disconnects the connection between the temperature sensing device and the temperature sensing module in the event of a short circuit. This is specifically illustrated in an embodiment of a short-circuit protection circuit for a respiratory system, and will not be repeated here.

[0094] In summary, the short-circuit protection circuit for a respiratory system provided by the present invention includes: a heating circuit, a heating modulation module, a temperature detection device, a protection module, a temperature detection module, and a control module; one end of the heating circuit is connected to the heating modulation module and a ground terminal, and is used to heat the respiratory tubing according to the driving current output by the heating modulation module; the temperature detection device is connected to the other end of the heating circuit, and is used to detect the temperature of the heating circuit according to the detection signal output by the temperature detection module; the protection module is connected to both the temperature detection device and the temperature detection module, and is used to disconnect the connection between the temperature detection device and the temperature detection module in the event of a short circuit; the control module is connected to both the heating modulation module and the temperature detection module, and is used to send a first signal to the temperature detection module at intervals, and to output a second signal to the heating modulation module when the temperature detected by the temperature detection module is lower than the rated temperature; the temperature detection module is connected to the temperature detection device, and is used to output a detection signal to the temperature detection device according to the first signal; the heating modulation module is connected to the heating circuit, and is used to output a driving current to the heating circuit according to the second signal. This invention connects the temperature detection device and the temperature detection module through a protection module, and disconnects the connection between the temperature detection device and the temperature detection module in the event of a short circuit, thereby achieving short-circuit protection for the respiratory system.

[0095] It should be understood that the application of the present invention is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A short-circuit protection circuit for a respiratory system, characterized in that, include: Heating circuit, heating modulation module, temperature detection device, protection module, temperature detection module and control module; The first end of the heating circuit is connected to the heating modulation module, and the second end of the heating circuit is connected to the ground terminal, which is used to heat the breathing tube according to the driving current output by the heating modulation module. The temperature detection device is connected to the third end of the heating circuit and is used to detect the temperature of the heating circuit according to the detection signal output by the temperature detection module. The protection module is connected to both the temperature sensing device and the temperature detection module, and is used to disconnect the connection between the temperature sensing device and the temperature detection module in the event of a short circuit. The control module is connected to the heating modulation module and the temperature detection module respectively, and is used to send a first signal to the temperature detection module according to the interval period, and output a second signal to the heating modulation module when the temperature detected by the temperature detection module is lower than the rated temperature. The temperature detection module is connected to the temperature detection device and is used to output a detection signal to the temperature detection device according to the first signal; The heating modulation module is connected to the heating circuit and is used to output a drive current to the heating circuit according to the second signal; The heating modulation module includes a driving unit, a buffer unit, and a short-circuit protection unit. The buffer unit is connected to the first power supply voltage, the control module, and the drive unit respectively, and is used to buffer the second signal, divide the first power supply voltage, and output the divided voltage signal to the drive unit. The driving unit is connected to the heating circuit and is used to turn on according to the voltage divider signal and output driving current to the heating circuit; The short-circuit protection unit is connected to the first power supply voltage, the driving unit, and the buffer unit respectively, and is used to disconnect the connection between the first power supply voltage and the driving unit and the buffer unit when a short circuit occurs. The buffer unit includes a first transistor, a second transistor, a third transistor, a first resistor, a second resistor, a third resistor, and a fourth resistor; The base of the first transistor is connected to the control module, the emitter of the first transistor is grounded, and the collector of the first transistor is connected to one end of the first resistor and the collector of the second transistor, respectively. The emitter of the second transistor is connected to one end of the third resistor and the emitter of the third transistor, respectively, and the base of the second transistor is connected to the base of the third transistor and the other end of the second resistor, respectively. The collector of the third transistor is connected to the first power supply voltage, one end of the fourth resistor, and one end of the second resistor, respectively; the other end of the second resistor is connected to the other end of the first resistor; the other end of the fourth resistor is connected to the driving unit and the other end of the third resistor, respectively. The temperature detection module includes a fourth transistor, a fifth transistor, and a fifth resistor; The base of the fourth transistor is connected to the control module, the emitter of the fourth transistor is grounded, and the collector of the fourth transistor is connected to the base of the fifth transistor. The emitter of the fifth transistor is connected to the second power supply voltage, the collector of the fifth transistor is connected to one end of the fifth resistor, and the other end of the fifth resistor is connected to the control module and the temperature detection device.

2. The short-circuit protection circuit for the respiratory system according to claim 1, characterized in that, The protection module includes a first fuse; The first fuse is connected to both the temperature sensing device and the temperature sensing module, and is used to blow in the event of a short circuit to disconnect the temperature sensing device from the temperature sensing module.

3. The short-circuit protection circuit for the respiratory system according to claim 1, characterized in that, It also includes a first high-voltage protection unit and a second high-voltage protection unit; The first high-voltage protection unit is connected to the heating circuit and the temperature detection device respectively, and is used to block the high-voltage signal of the heating circuit from flowing into the temperature detection device; The second high-voltage protection unit is connected to the temperature detection module to prevent the high-voltage signal of the heating modulation module from flowing into the temperature detection module during a short circuit.

4. The short-circuit protection circuit for the respiratory system according to claim 1, characterized in that, The driving unit includes a first switching transistor; The gate of the first switching transistor is connected to the buffer unit, the source of the first switching transistor is connected to the short-circuit protection unit, and the drain of the first switching transistor is connected to the heating circuit.

5. The short-circuit protection circuit for the respiratory system according to claim 1, characterized in that, The short-circuit protection unit is a second fuse; The second fuse is connected to the first power supply voltage, the drive unit, and the buffer unit respectively, and is used to disconnect the connection between the first power supply voltage and the drive unit, and disconnect the connection between the first power supply voltage and the buffer unit in the event of a short circuit.

6. A respiratory assist device, characterized in that, The device includes a main body, in which a circuit board is provided, and the circuit board is provided with a short-circuit protection circuit for the respiratory system as described in any one of claims 1-5.

7. A method for short-circuit protection of a respiratory system, characterized in that, The method, applied to the respiratory system short-circuit protection circuit according to any one of claims 1-5, comprises: The control module sends a first signal to the temperature detection module according to the interval period; The temperature detection module outputs a detection signal to the temperature detection device based on the first signal; The temperature detection device detects the temperature of the heating circuit based on the detection signal; When the temperature detected by the temperature detection module is lower than the rated temperature, the control module outputs a second signal to the heating modulation module; The heating modulation module outputs a drive current to the heating circuit based on the second signal; The heating circuit heats the breathing tube according to the driving current; The protection module disconnects the temperature sensing device from the temperature sensing module in the event of a short circuit.

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