CN220171448U - Breathing support device and temperature control circuit thereof - Google Patents
Breathing support device and temperature control circuit thereof Download PDFInfo
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- CN220171448U CN220171448U CN202321342889.2U CN202321342889U CN220171448U CN 220171448 U CN220171448 U CN 220171448U CN 202321342889 U CN202321342889 U CN 202321342889U CN 220171448 U CN220171448 U CN 220171448U
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- 230000029058 respiratory gaseous exchange Effects 0.000 title abstract description 12
- 238000010438 heat treatment Methods 0.000 claims abstract description 131
- 230000000241 respiratory effect Effects 0.000 claims description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010792 warming Methods 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007794 irritation Effects 0.000 description 2
- 210000002345 respiratory system Anatomy 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 206010061218 Inflammation Diseases 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 210000004400 mucous membrane Anatomy 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Abstract
The utility model discloses a breathing support device and a temperature control circuit thereof, wherein the circuit comprises a power supply module, a control module, a temperature comparison module, a heating driving module and a temperature acquisition module for acquiring the temperature of a heating element; the control module is connected with a first input end of the temperature comparison module, the temperature acquisition module is connected with a second input end of the temperature comparison module, an output end of the temperature comparison module is connected with an input end of the heating driving module, and an output end of the heating driving module is connected with the heating element; the power module is connected with the control module, the temperature comparison module, the heating driving module and the temperature acquisition module. The utility model releases MCU resources, shortens the temperature control time and greatly improves the temperature control precision.
Description
Technical Field
The utility model belongs to the technical field of temperature control, and particularly relates to breathing support equipment and a temperature control circuit thereof.
Background
In using respiratory support apparatus, the patient is required to receive high concentrations and high flow rates of oxygen or air, which are often cold-dried and can cause irritation and injury to the respiratory tract. Respiratory support devices (e.g., single level ventilators, double level ventilators, high flow rate humidification therapy devices) are equipped with warming lines that primarily serve to warm and humidify the gases delivered to the patient by the respiratory support device to an appropriate temperature, typically between 30 ℃ and 37 ℃, which helps to reduce irritation and discomfort to the respiratory tract, and may increase the solubility of oxygen to allow the patient to more effectively absorb oxygen. In addition, the heating pipeline can also prevent condensed water from appearing when humidifying the gas conveyed by the breathing support device, and the humidified gas can relieve the dryness and inflammatory reaction of the airway mucous membrane and improve the comfort and the tolerance of a patient.
At present, the temperature control of the heating pipeline of the breathing support device in the market is that the MCU actively controls the heating power of the heating pipeline in a PWM mode, and then periodically adjusts the duty ratio of PWM through the temperature value fed back by the temperature sensor at the end of the heating pipeline so as to adjust the heating power of the heating pipeline, and finally, the temperature of the heating pipeline is maintained near the target temperature from coarse adjustment to repeated fine adjustment. This control has the following disadvantages:
(1) The control period is relatively long: from coarse tuning to multiple fine tuning to maintain the target temperature;
(2) The occupied MCU resources are more: the MCU needs to participate in the whole course from coarse adjustment, fine adjustment to the target temperature maintenance and then to the end of use;
(3) The control precision is lower: the temperature control accuracy can only achieve +/-2 ℃ generally.
As shown in a schematic diagram of a heating pipeline temperature control device of the prior breathing support device in fig. 1, after the breathing support device is started, the MCU controls the initial heating power of the heating pipeline to the heating control circuit in a PWM signal mode according to the heating pipeline temperature value (i.e. target temperature) set by the user, and the initial heating power is generally higher, so that the temperature of the heating pipeline is quickly increased; meanwhile, the MCU periodically acquires a feedback value of the temperature sensor so as to monitor the temperature change condition of the heating pipeline; when the temperature of the heating pipeline is close to the set target temperature, the MCU reduces the heating power of the heating pipeline by reducing the PWM duty ratio; when the warming line temperature exceeds the set target temperature, the MCU turns off the PWM signal until the MCU detects that the warming line temperature is below the set target temperature, again providing a PWM signal of appropriate duty cycle to maintain the warming line temperature fluctuating around the set target temperature. The MCU acquires the feedback value of the temperature sensor with periodicity, then makes corresponding judgment according to the feedback value and gives an adjustment instruction, and the periodic feedback adjustment has certain hysteresis in time, so that the temperature fluctuation amplitude of the heating pipeline is large, as shown in fig. 2. The existing temperature control mode can be referred to as a method and a system for humidifying and regulating a respiratory support device (application publication number is CN 110180066A).
Disclosure of Invention
The utility model aims to provide breathing support equipment and a temperature control circuit thereof, which are used for solving the problems of long control period, more MCU (micro control unit) resource occupation and lower control precision in the traditional control mode.
The utility model solves the technical problems by the following technical scheme: a temperature control circuit comprises a power supply module, a control module, a temperature comparison module, a heating driving module and a temperature acquisition module for acquiring the temperature of a heating element; the control module is connected with a first input end of the temperature comparison module, the temperature acquisition module is connected with a second input end of the temperature comparison module, an output end of the temperature comparison module is connected with an input end of the heating driving module, and an output end of the heating driving module is connected with the heating element; the power module is connected with the control module, the temperature comparison module, the heating driving module and the temperature acquisition module.
Further, the temperature comparison module comprises a digital potentiometer and an operational amplifier; the input end of the digital potentiometer is connected with the control module, and the output end of the digital potentiometer is connected with the inverting input end of the operational amplifier; the non-inverting input end of the operational amplifier is used as a second input end of the temperature comparison module and is connected with the temperature acquisition module; and the output end of the operational amplifier is connected with the heating driving module.
Further, the temperature comparison module is connected with the control module through an I2C bus.
Further, the heating driving module comprises a MOS tube and a resistor R1; the grid electrode of the MOS tube and the first end of the resistor R1 are respectively connected with the output end of the temperature comparison module; the source electrode of the MOS tube and the second end of the resistor R1 are respectively connected with the temperature acquisition module, and the source electrode of the MOS tube and the second end of the resistor R1 are grounded; and the drain electrode of the MOS tube is connected with the heating element.
Further, the temperature acquisition module comprises a temperature sensor and a resistor R2, wherein the input end of the temperature sensor is connected with the heating driving module, the output end of the temperature sensor is connected with the first end of the resistor R2, the second end of the resistor R2 is connected with the power supply module, and the output end of the temperature sensor is also connected with the second input end of the temperature comparison module.
Further, the heating element is a heating pipeline or a heating plate.
Further, the control module selects MCU with model STM32F series.
Based on the same concept, the present utility model also provides a respiratory support apparatus comprising a temperature control circuit as described above.
Advantageous effects
Compared with the prior art, the utility model has the advantages that:
according to the breathing support device and the temperature control circuit thereof, the temperature comparison module receives the target temperature set by the user and sent by the control module, and the real-time temperature value of the heating element acquired by the temperature acquisition module, compares the target temperature with the real-time temperature value, and controls the operation of the heating driving module according to the comparison result, so that the operation of the heating element is controlled. When the real-time temperature value is lower than the target temperature, the temperature comparison module controls the heating element to heat through the heating driving module; when the real-time temperature value exceeds the target temperature, the temperature comparison module controls the heating element to stop heating through the heating driving module; when the real-time temperature value is lower than the target temperature again, the temperature comparison module controls the heating element to heat through the heating driving module until the real-time temperature value reaches the target temperature, and the circulation is repeated, so that the heating element is ensured to fluctuate within a very small temperature range, and the constant temperature state is basically achieved.
The control module only sends the target temperature to the temperature comparison module, does not participate in the heating and temperature rising and constant temperature control processes, and releases control module resources; the temperature comparison module starts heating from the heating element, namely, continuous heating of the heating element can be controlled, meanwhile, the temperature of the heating element is monitored through the real-time temperature value fed back by the temperature acquisition module, and the work of the heating element is timely regulated according to the target temperature and the real-time temperature value, so that the regulating time from starting heating to constant temperature is shortened, and the control precision is greatly improved.
Drawings
In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawing in the description below is only one embodiment of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a conventional heating line temperature control device in accordance with the background of the utility model;
FIG. 2 is a graph showing the temperature fluctuation of a conventional heating pipeline in the background of the utility model;
FIG. 3 is a block diagram of a temperature control circuit in an embodiment of the utility model;
FIG. 4 is a schematic diagram of a temperature control circuit in an embodiment of the utility model;
FIG. 5 is a graph showing temperature fluctuations of a heating element in an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made more apparent and fully by reference to the accompanying drawings, in which it is shown, however, only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
The technical scheme of the utility model is described in detail below by specific examples. The following embodiments may be combined with each other, and some embodiments may not be repeated for the same or similar concepts or processes.
As shown in fig. 3, the temperature control circuit provided in this embodiment includes a power module, a control module, a temperature comparison module, a heating driving module, and a temperature acquisition module for acquiring the temperature of a heating element; the control module is connected with a first input end of the temperature comparison module, the temperature acquisition module is connected with a second input end of the temperature comparison module, an output end of the temperature comparison module is connected with an input end of the heating driving module, and an output end of the heating driving module is connected with the heating element; the power module is connected with the control module, the temperature comparison module, the heating driving module and the temperature acquisition module.
In the utility model, the control module sends the target temperature set by the user to the temperature comparison module, and the temperature comparison module controls the continuous operation of the heating driving module according to the target temperature, thereby controlling the continuous heating of the heating element; meanwhile, the temperature comparison module continuously monitors the real-time temperature value fed back by the temperature acquisition module, and then the work of the heating element is timely adjusted according to the target temperature and the real-time temperature value: when the real-time temperature value is lower than the target temperature, the temperature comparison module controls the heating element to heat through the heating driving module; when the real-time temperature value exceeds the target temperature, the temperature comparison module controls the heating element to stop heating through the heating driving module; when the real-time temperature value is lower than the target temperature again, the temperature comparison module controls the heating element to heat through the heating driving module until the real-time temperature value reaches the target temperature, and the circulation is repeated, so that the heating element is ensured to fluctuate within a very small temperature range, and the constant temperature state is basically achieved.
As shown in fig. 4, in one embodiment of the present utility model, the temperature comparison module includes a digital potentiometer U1 and an operational amplifier U2; the input end (namely the SCL end and the SDA end) of the digital potentiometer U1 is connected with the control module, and the output end (namely the W end) of the digital potentiometer U1 is connected with the inverting input end of the operational amplifier U2; the non-inverting input end of the operational amplifier U2 is used as a second input end of the temperature comparison module, and the non-inverting input end of the operational amplifier U2 is connected with the output end of the temperature sensor J2 in the temperature acquisition module; the output end of the operational amplifier U2 is connected with the grid electrode of the MOS tube in the heating driving module.
In this embodiment, the digital potentiometer U1 is selected from TPL0401B.
As shown in fig. 4, in one embodiment of the present utility model, the heating driving module includes a MOS transistor Q1 and a resistor R1; the grid electrode of the MOS tube Q1 and the first end of the resistor R1 are respectively connected with the output end of the operational amplifier U2 in the temperature comparison module; the source electrode of the MOS tube Q1 and the second end of the resistor R1 are respectively connected with the input end of the temperature sensor J2 in the temperature acquisition module, and the source electrode of the MOS tube Q1 and the second end of the resistor R1 are grounded; the drain electrode of the MOS transistor Q1 is connected with the heating element J1.
As shown in fig. 4, in a specific embodiment of the present utility model, the temperature acquisition module includes a temperature sensor J2 and a resistor R2, an input end of the temperature sensor J2 is connected to a source electrode of the MOS transistor Q1 in the heating driving module, an output end of the temperature sensor J2 is connected to a first end of the resistor R2, a second end of the resistor R2 is connected to the power supply module, and an output end of the temperature sensor J2 is further connected to a non-inverting input end of the operational amplifier U2 in the temperature comparison module.
In the embodiment, the temperature sensor is a negative temperature coefficient temperature sensor; the heating element is a heating pipeline or a heating plate; the control module adopts MCU, and the specific model of MCU in this embodiment is STM32F407VET6.
The specific working principle of the temperature control circuit applied to the breathing support device is as follows:
after the breathing support equipment is electrified, initializing an MCU and a temperature comparison module; because the resistor R1 is grounded in a pull-down way, the grid electrode of the MOS tube Q1 is at a low level, the MOS tube Q1 is cut off, and the heating element does not work.
After receiving the target temperature set by the user, the MCU transmits the target temperature to the digital potentiometer U1 through I2C communication (namely an SCL end and an SDA end of the digital potentiometer U1); the digital potentiometer U1 outputs a specific resistance resistor with one end grounded and the other end connected with the W end (namely the 5 pin of the U1) through internal D/A conversion and forms a voltage dividing loop with the resistor R3, and the W end of the digital potentiometer U1 outputs a fixed voltage value to the inverting input end of the operational amplifier U2 and takes the fixed voltage value as a threshold value A (namely the target temperature); the resistor R2 and the temperature sensor J2 form another voltage division loop, and a loop node (namely a connection point of the resistor R2 and the temperature sensor J2) is connected with the non-inverting input end of the operational amplifier U2. The operational amplifier U2 compares the received real-time temperature value acquired by the temperature sensor with a threshold A of an inverting input end of the real-time temperature value; because the temperature sensor J2 is of a negative temperature coefficient characteristic (namely, the numerical value output by the temperature sensor is inversely proportional to the temperature), when the real-time temperature value of the heating element is lower than the target temperature, namely, the numerical value B output by the feedback of the temperature sensor J2 is higher than the threshold A, the input of the non-inverting input end is greater than the input of the inverting input end, the output end of the operational amplifier U2 outputs a high level, the MOS tube Q1 is controlled to be conducted, and the heating element starts to heat.
Along with the continuous heating, the temperature of the heating element rises rapidly, the value B fed back by the temperature sensor J2 drops rapidly, when the real-time temperature value of the heating element is higher than the target temperature, namely, the value B fed back by the temperature sensor J2 is lower than the threshold A, the input of the non-inverting input end is smaller than the input of the inverting input end, the output end of the operational amplifier U2 outputs a low level, the MOS tube Q1 is controlled to be cut off, and the heating element stops heating.
After heating is suspended, the temperature of the heating element slowly drops, the value B fed back by the temperature sensor J2 slowly rises, when the temperature of the heating element drops below the target temperature, the value B fed back by the temperature sensor J2 is higher than the threshold A again, the input of the non-inverting input end is greater than the input of the inverting input end, the output end of the operational amplifier U2 outputs a high level, the MOS tube Q1 is controlled to be conducted again, and the heating element continues to heat.
The heating element is repeatedly circulated in such a way that the temperature of the heating element rises, exceeds the target temperature, the heating element is turned off, the temperature of the heating element falls, falls below the target temperature and the heating element is turned on again, so that the temperature of the heating element is ensured to be close to a constant temperature state.
The MCU only needs to transmit the target temperature set by the user to the temperature comparison module through I2C communication, and the heating and temperature rising and constant temperature control processes do not need MCU participation; the temperature comparison module starts heating from the heating element, namely, the temperature value of the heating element can be continuously monitored through the feedback of the temperature sensor, meanwhile, the temperature value fed back by the temperature sensor is compared with the target temperature, and the adjustment action is timely carried out according to the comparison result: if the temperature value of the heating element reaches the target temperature, controlling the heating element to stop heating; if the temperature of the heating element is lower than the target temperature due to the heating suspension, the heating pipeline is controlled again to continue heating until the target temperature is reached, heating is suspended again, and the circulation is repeated in this way, so that the temperature of the heating element is ensured to fluctuate within a very small range and basically reaches a constant temperature state, as shown in fig. 5. The temperature control circuit releases MCU resources, shortens the time from heating to constant temperature, greatly improves the temperature control precision, and can reach +/-0.1 ℃.
The foregoing disclosure is merely illustrative of specific embodiments of the present utility model, but the scope of the present utility model is not limited thereto, and any person skilled in the art will readily recognize that changes and modifications are possible within the scope of the present utility model.
Claims (9)
1. A temperature control circuit, characterized by: the circuit comprises a power supply module, a control module, a temperature comparison module, a heating driving module and a temperature acquisition module for acquiring the temperature of the heating element; the control module is connected with a first input end of the temperature comparison module, the temperature acquisition module is connected with a second input end of the temperature comparison module, an output end of the temperature comparison module is connected with an input end of the heating driving module, and an output end of the heating driving module is connected with the heating element; the power module is connected with the control module, the temperature comparison module, the heating driving module and the temperature acquisition module.
2. The temperature control circuit of claim 1, wherein: the temperature comparison module comprises a digital potentiometer and an operational amplifier; the input end of the digital potentiometer is connected with the control module, and the output end of the digital potentiometer is connected with the inverting input end of the operational amplifier; the non-inverting input end of the operational amplifier is used as a second input end of the temperature comparison module and is connected with the temperature acquisition module; and the output end of the operational amplifier is connected with the heating driving module.
3. The temperature control circuit of claim 2, wherein: the model of the digital potentiometer is TPL0401B.
4. The temperature control circuit of claim 1, wherein: the temperature comparison module is connected with the control module through an I2C bus.
5. The temperature control circuit of claim 1, wherein: the heating driving module comprises an MOS tube and a resistor R1; the grid electrode of the MOS tube and the first end of the resistor R1 are respectively connected with the output end of the temperature comparison module; the source electrode of the MOS tube and the second end of the resistor R1 are respectively connected with the temperature acquisition module, and the source electrode of the MOS tube and the second end of the resistor R1 are grounded; and the drain electrode of the MOS tube is connected with the heating element.
6. The temperature control circuit of claim 1, wherein: the temperature acquisition module comprises a temperature sensor and a resistor R2, wherein the input end of the temperature sensor is connected with the heating driving module, the output end of the temperature sensor is connected with the first end of the resistor R2, the second end of the resistor R2 is connected with the power supply module, and the output end of the temperature sensor is also connected with the second input end of the temperature comparison module.
7. The temperature control circuit of claim 1, wherein: the heating element is a heating pipeline or a heating plate.
8. The temperature control circuit of claim 1, wherein: and the control module is an MCU with the model of STM32F series.
9. A respiratory support apparatus, characterized by: the apparatus comprising a temperature control circuit as claimed in any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321342889.2U CN220171448U (en) | 2023-05-30 | 2023-05-30 | Breathing support device and temperature control circuit thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321342889.2U CN220171448U (en) | 2023-05-30 | 2023-05-30 | Breathing support device and temperature control circuit thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220171448U true CN220171448U (en) | 2023-12-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321342889.2U Active CN220171448U (en) | 2023-05-30 | 2023-05-30 | Breathing support device and temperature control circuit thereof |
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| Country | Link |
|---|---|
| CN (1) | CN220171448U (en) |
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2023
- 2023-05-30 CN CN202321342889.2U patent/CN220171448U/en active Active
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