CN104815373B - Lung ventilator and its Poewr control method and system - Google Patents

Abstract

The invention discloses a method for controlling the power of a ventilator. The ventilator includes a power supply, a heating device and a fan. ; comparing the instantaneous power of the fan with a first preset power; when the instantaneous power of the fan is greater than or equal to the first preset power, reduce the instantaneous power of the heating device to a second power. The embodiment of the present invention reduces the requirement on the total power of the power supply and saves energy consumption by reducing the instantaneous power consumption of the heating device to meet the instantaneous power required by the instantaneous acceleration of the fan under the working state of the instantaneous acceleration of the fan. The use of a low-power power supply also reduces the volume of the entire ventilator, laying the foundation for the development of further miniaturization of the ventilator.

Description

Ventilator and its power control method and system

technical field

The invention relates to a breathing apparatus, in particular to a ventilator and a power control method and system thereof.

Background technique

At present, ventilators all have the function of humidifying and pressurizing the flowing gas (such as air) in the breathing tube. There is a heating device inside the ventilator. After the heating device continuously heats the water (or other aqueous solution) in the water tank, the gas will become humid when it flows through the water surface, and the gas will be heated at the same time, so that the user Bring a more comfortable experience. The inside of the ventilator is also provided with a fan, which can suck external air into the ventilator and at the same time apply a certain pressure to the gas entering the breathing tube, which helps to further enhance the use effect. When the user suffers from respiratory stagnation, the fan can further increase the pressure of the gas entering the ventilator pipeline by increasing the speed to maintain the gas exchange between the user and the ventilator, ensuring that the user can still breathe when the respiratory stagnation occurs. Maintain normal gas metabolism.

When the heating device in the ventilator is heated, the rated power is generally maintained at tens of watts (for example, 30W), which can ensure that the evaporation rate of water is maintained near a constant value, so that the gas in the ventilator pipeline is kept at a suitable temperature. The humidity is close to the best experience. Excessive power may cause the evaporation rate of water to be too fast, causing the gas in the ventilator pipeline to be too humid or the temperature of the gas to be too high, resulting in an unsafe situation for the patient and poor user experience. If the power is too low, the evaporation rate of water may be too low, causing the gas in the ventilator tube to be too dry or the gas temperature to be too low, which will also make the user experience worse.

The fan that pressurizes the gas in the ventilator pipeline, under normal working conditions, the rated power is generally kept at a relatively small power value (for example, more than 20 watts), so that the pressure value applied to the gas can be maintained at a constant value. The value is near, and the gas in the ventilator pipeline is kept near an appropriate pressure value, and the use experience is optimal. Excessive power may cause the speed of the fan to be too high, causing the gas pressure in the ventilator pipeline to be too high, which will bring uncomfortable experience to the user. If the power is too low, the speed of the fan may be too low, causing the gas pressure in the ventilator pipeline to be too low, which will reduce the use effect of the ventilator and fail to maintain the normal gas metabolism of the user.

However, in some cases, it is necessary to increase the speed of the fan to increase the gas pressure in the ventilator pipeline, for example, when the user suffers from respiratory arrest. When the user suffers from respiratory arrest, external gas with a high pressure value is required to assist in maintaining gas exchange. In this case, the fan needs to speed up the speed in an instant (usually a few seconds or a few tenths of a second) to increase the pressure value of the gas in the ventilator pipeline. At this time, the instantaneous power of the fan will increase to a very large value (such as 50W).

Generally, only one power supply is arranged inside the ventilator, and the power supply provides power for the heating device and the blower at the same time. In this way, there are certain requirements for the power of the power supply. In the case of meeting the normal operation of the heating device and ensuring that the fan can smoothly complete the instantaneous acceleration, the power of the power supply is at least the sum of the instantaneous power of the fan and the rated power of the heating device (for example, 80W ). However, such a power supply will increase power consumption, which is not conducive to saving energy. At the same time, it will also make the volume of the ventilator larger, which is not conducive to the overall structure of the ventilator meeting the design requirements of compactness.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the problem that the ventilator in the prior art needs to be equipped with a relatively high-power power supply in order to meet the instantaneous acceleration of the blower fan, resulting in increased power consumption of the power supply.

In order to solve the above technical problems, an embodiment of the present invention firstly provides a power control method for a ventilator, the ventilator includes a power supply, a heating device, and a fan, wherein the method includes: the power supply is simultaneously the heating device and when the fan is powered, monitor the instantaneous power of the fan in real time; compare the instantaneous power of the fan with the first preset power; when the instantaneous power of the fan is greater than or equal to the first preset power, reduce the The instantaneous power of the heating device to the second power.

Preferably, the method includes: comparing the instantaneous power of the fan with a third preset power; when the instantaneous power of the fan is smaller than the third preset power, increasing the instantaneous power of the heating device to the fourth Power; wherein, the first preset power is greater than or equal to the third preset power, and the second power is smaller than the fourth power.

Preferably, the second power is 0.

Preferably, the instantaneous power of the fan is monitored in real time by monitoring the working current of the fan in real time.

An embodiment of the present invention also provides a power control system for a ventilator, the ventilator includes a power supply, a heating device, and a fan; wherein, the system includes: a monitor, used for the power supply to simultaneously control the heating device and the fan; When the fan is powered, the instantaneous power of the fan is monitored in real time; the first comparator is used for comparing the instantaneous power of the fan with the first preset power; the controller is used for when the instantaneous power of the fan is greater than or equal to the When the first preset power is selected, the instantaneous power of the heating device is reduced to the second power.

Preferably, the system includes: a second comparator for comparing the instantaneous power of the fan with a third preset power; the controller is also used for when the instantaneous power of the fan is less than the third preset power , increasing the instantaneous power of the heating device to a fourth power; wherein, the first preset power is greater than or equal to the third preset power, and the second power is smaller than the fourth power.

Preferably, the controller is configured to reduce the instantaneous power of the heating device to 0 when the instantaneous power of the fan is greater than or equal to the first preset power.

Preferably, the monitor includes a current monitoring module for monitoring the working current of the fan in real time.

The embodiment of the present invention also provides a ventilator, including a power supply, a heating device, and a blower, and also includes the above-mentioned power control system.

Compared with the prior art, the embodiments of the present invention compared with the prior art, in the working state of the instantaneous acceleration of the fan, by reducing the instantaneous power consumption of the heating device to meet the instantaneous power required for the instantaneous acceleration of the fan, the impact on the fan is reduced. The total power requirement of the power supply saves energy consumption. The use of a low-power power supply also reduces the volume of the entire ventilator, laying the foundation for the development of further miniaturization of the ventilator.

Other features and advantages of the present invention will be set forth in the following description, and partly become obvious from the description, or can be understood by implementing the technical solutions of the present invention. The objectives and other advantages of the present invention can be realized and obtained by the structures and/or processes particularly pointed out in the specification, claims and accompanying drawings.

Description of drawings

The accompanying drawings are used to provide a further understanding of the technical solutions of the present application or the prior art, and constitute a part of the description. Wherein, the drawings expressing the embodiments of the present application are used together with the embodiments of the present application to explain the technical solutions of the present application, but do not constitute limitations on the technical solutions of the present application.

FIG. 1 is a schematic flowchart of a power control method for a ventilator according to an embodiment of the present invention.

FIG. 2 is a schematic flowchart of a power control method for a ventilator according to another embodiment of the present invention.

Fig. 3 is a schematic structural diagram of a power control system of a ventilator according to an embodiment of the present invention.

detailed description

The implementation of the present invention will be described in detail below in conjunction with the accompanying drawings and examples, so as to fully understand and implement the implementation process of how to apply technical means to solve technical problems and achieve corresponding technical effects in the present invention. The embodiments of the present application and the various features in the embodiments can be combined with each other under the premise of no conflict, and the formed technical solutions are all within the protection scope of the present invention.

Additionally, the steps shown in the flowcharts of the figures may be performed in a computer system, such as a set of computer-executable instructions. Also, although a logical order is shown in the flowcharts, in some cases the steps shown or described may be performed in an order different from that shown or described herein.

In order to solve the problem that the heating device and fan in the ventilator must rely on a high-power power supply to meet the work requirements, the inventor of the present invention has found a reasonable technical solution that can solve the above-mentioned problem after in-depth research. Because the working process of the instantaneous acceleration of the fan is generally kept short, in this short period, even if the adjustment of the humidity of the gas is stopped, the humidity of the gas provided to the user will not change significantly. Moreover, even if the humidity of the gas provided to the user will change to a certain extent, compared with the comfortable experience brought by the humid gas to the user, it is far from offsetting the potential risk brought by the fan when it should be accelerated but not accelerated.

Therefore, the need for water heating becomes less important when there is a need for instantaneous acceleration of the fan. Based on this analysis, time-sharing control can be performed on the two demands of heating and fan acceleration. When there is a fan acceleration demand, the heating device can be temporarily controlled to stop heating or reduce the power of the heating device, and resume work after the fan completes the acceleration demand.

In the power control method of a ventilator according to an embodiment of the present invention, the ventilator includes a power supply, a heating device, and a fan. As shown in FIG. 1 , the power control method of the ventilator according to the embodiment of the present invention mainly includes the following steps.

Step S110, when the power supply supplies power to the heating device and the blower at the same time, the instantaneous power of the blower during operation is monitored in real time.

Step S120, compare the instantaneous power of the fan with the first preset power in real time, if the instantaneous power of the fan is greater than or equal to the first preset power, go to step S130, otherwise go to step S140. Wherein, the first preset power is preset to identify whether the fan enters the working state of instantaneous acceleration. If it is detected in real time that the instantaneous power of the fan exceeds the first preset power, it means that the fan has just entered the working state of instantaneous acceleration. Usually, this situation occurs to increase the pressure value of the gas in the ventilator pipeline, so as to maintain normal gas exchange for the user of the ventilator and prevent the user from apnea and other conditions.

Step S130, when comparing the instantaneous power of the blower fan is greater than or equal to the first preset power, reduce the instantaneous power of the heating device, for example, reduce the heating device from a previous power to a second power. At this time, the heat generated by the heating device will drop. The reduction of the heat generated by the heating device will only change the degree of humidity of other water tanks passing through the water tank to a certain extent, and will not significantly affect the user's experience.

Step S140, when there is no comparison that the instantaneous power of the blower is greater than or equal to the first preset power, it means that the previous power and operating state of the blower can be maintained, and there is no need to reduce the instantaneous power of the heating device to maintain the current heating temperature of the heating device and output power.

For the short-term instantaneous acceleration of the fan, the heating device appropriately reduces the operating power or directly stops heating, and the humidity of the gas passing through the water tank will only have subtle changes that are difficult for the human body to detect. Such subtle changes will not significantly change the user's perception of the gas The feeling of humidity will not affect the user's effect of using the ventilator. Therefore, in the embodiment of the present invention, when the fan speeds up instantaneously, the instantaneous power of the heating device is actively reduced, without changing the user experience, it can effectively prevent the user from experiencing events such as apnea, and improve the protection of the ventilator. It also reduces the high power requirements of the power supply in the ventilator. The power of the power supply does not need to meet the instantaneous acceleration of the fan and the normal heating of the heating device at the same time. Therefore, compared with the prior art, the requirements for power supply are reduced, so that a power supply with a slightly lower power can also be competent for the work of the fan and heating device in the ventilator, and only the power of the power supply can match the instantaneous acceleration demand of the fan and the heating device and heating device. Fans are required to work normally (not in the instantaneous acceleration stage), and it is not necessary to match the instantaneous acceleration of the extension unit and the normal operation of the heating device at the same time. Moreover, considering that the volume of the power supply with lower power is generally smaller, the embodiment of the present invention also reduces the volume of the power supply in the ventilator, thereby laying a good foundation for further miniaturization of the ventilator.

In the embodiment of the present invention, when the fan speeds up instantaneously to maintain the normal gas exchange of the user and avoid the user from experiencing apnea, the instantaneous power of the fan can be reduced again to avoid providing the user with high pressure for a long time. The gas will cause discomfort to the user.

In contrast, as shown in FIG. 2 , in other embodiments of the present invention, on the basis of the embodiment shown in FIG. 1 , the instantaneous power of the heating device can also be continuously adjusted according to subsequent use conditions.

Step S210 to step S240 are the same as above step S110 to step S140.

Step S250, compare the instantaneous power of the fan with the third preset power, if the instantaneous power of the fan is less than the third preset power, go to step S260, otherwise go to step S270. This step is carried out after step S230.

Step S260, when comparing the instantaneous power of the blower fan to less than the third preset power, increase the instantaneous power of the heating device to the fourth power for operation. Wherein, the first preset power is greater than or equal to the third preset power, and the second power is smaller than the fourth power.

Step S270, when it is judged in real time that the instantaneous power of the fan is not less than the third preset power, it means that the fan is still in the accelerated working state, and it is sufficient to maintain the working state and the instantaneous power of the heating device at this time.

In the embodiment of the present invention shown in FIG. 2 , after the blower is accelerated instantaneously to increase the pressure of the gas, events such as apnea of the user can be effectively avoided. The risk that the user may experience events such as apnea is effectively mitigated by the instantaneous acceleration of the ventilator. Afterwards, the fan does not need to continue to maintain high-speed operation to maintain the high pressure value of the gas, and returns to the normal operation state before the instantaneous acceleration (relatively speaking, the instantaneous acceleration operation state of the fan can be called the emergency operation state). The power will be reduced appropriately. That is, if the instantaneous power of the fan is less than the third preset power, it means that the fan has completed the operation stage of instantaneous acceleration. At this time, the heating device can return to the normal heating state before the instantaneous acceleration of the fan, and increase the instantaneous power. That is to say, the second power is increased from the second power when the blower is accelerated instantaneously to the fourth power that can provide the user with gas with a good degree of humidity and a suitable temperature.

In order to prevent the fan from completing the task of instantaneous acceleration and adjusting to the normal operating state, the heating device cannot increase the instantaneous power in time, the embodiment of the present invention also continuously monitors the fan in real time after the fan completes the task of instantaneous acceleration instantaneous power and comparing the instantaneous power of the fan with a third preset power indicating that the fan will keep running when it returns to normal operating condition. When the instantaneous power of the fan is less than the third preset power, it means that the fan has exited the emergency operation state of instantaneous acceleration. At this time, the heating power of the heating device can be increased in time to provide users with a good degree of humidity and Gas at suitable temperature.

In the embodiment of the present invention, reducing the instantaneous power of the heating device may directly stop the heating operation of the heating device according to the situation, that is, control the power supply to stop supplying power to the heating device. At this point, the instantaneous power of the heating device is 0. That is to say, in the embodiment of the present invention, when the instantaneous power of the fan is greater than or equal to the first preset power, the instantaneous power of the heating device is reduced to 0 (the second power is 0). In this way, the power supply can only provide energy for the fan, further reducing the performance requirements of the power supply. Moreover, if the heating device is stopped for a short period of time, the degree of humidity of the gas passing through the water tank will not change significantly, so that it is difficult for the user to notice the difference in the degree of humidity of the gas, and the experience of the user will not be affected.

In the embodiment of the present invention, the instantaneous power of the fan can be monitored in real time by monitoring the working current of the fan in real time.

As shown in FIG. 3 , the power control system 300 of the ventilator according to the embodiment of the present invention includes a monitor 310 , a first comparator 320 and a controller 330 . The ventilator mainly includes a heating device 391, a fan 392, and a power supply 393 connected to the heating device 391 and the fan 392 and providing power to both.

The monitor 310 is connected with the fan 392 and is used to monitor the instantaneous power of the fan 392 in real time when the power supply 393 supplies power to the heating device 391 and the fan 392 at the same time.

The first comparator 320 is connected with the monitor 310 and used for comparing the instantaneous power of the fan 392 with the first preset power.

The controller 330 is connected with the first comparator 320 and the heating device 391, and is used for the first comparator 320 to reduce the instantaneous power of the heating device 391 to the second when the instantaneous power of the fan 392 is greater than or equal to the first preset power. power.

In the embodiment of the present invention, when the instantaneous power of the fan 392 compared by the first comparator 320 is greater than or equal to the first preset power, the controller 330 sends a first control instruction to the heating device 391 to notify the heating device 391 to reduce the instantaneous power. power to the second power. After receiving the first control instruction, the heating device 391 reduces the instantaneous power to the second power for operation according to the instruction of the first control instruction.

As shown in FIG. 3 , other embodiments of the present invention further include a second comparator 340 connected to the monitor 310 and the controller 330 for comparing the instantaneous power of the fan 392 with the third preset power. The controller 330 increases the instantaneous power of the heating device 391 to a fourth power when the instantaneous power of the blower 392 compared by the second comparator 340 is smaller than the third preset power. Wherein, the first preset power is greater than or equal to the third preset power, and the second power is smaller than the fourth power. For example, when the second comparator 340 compares the instantaneous power of the fan 392 to be greater than or equal to the first preset power, the controller 330 sends a second control instruction to the heating device 391 to notify the heating device 391 to increase the instantaneous power to the fourth level. power. After receiving the second control instruction, the heating device 391 increases the instantaneous power to the fourth power for operation according to the instruction of the second control instruction. Certainly, in the embodiment of the present invention, the first comparator 320 and the second comparator 340 may also be integrated together.

In some embodiments of the present invention, the controller 330 may reduce the instantaneous power of the heating device 391 to 0 when the first comparator 320 compares the instantaneous power of the blower 392 to be greater than or equal to the first preset power. For example, the heating device 391 is controlled to be disconnected from the power supply 393 , or the control power supply 393 directly connected to the controller 330 and receiving instructions from the controller 330 stops supplying power to the heating device 391 . If the first control command sent by the controller indicates to reduce the instantaneous power to 0 or to instruct the heating device to stand by or even stop running, the heating device can reduce the instantaneous power to 0 according to the corresponding instruction, or to be on standby or even stop running, to stop heating the liquid in the jug.

In other embodiments of the present invention, the controller 330 can also send corresponding instructions to the power supply 393 to instruct the power supply 393 to reduce the instantaneous power of the heating device 391 to the second when the fan is accelerated instantaneously and/or after the instantaneous acceleration operation is completed. Second power (when the fan is accelerating instantaneously), increase the instantaneous power of the heating device to the fourth power (after the fan instantaneous acceleration operation is completed).

In the embodiment of the present invention, the controller 330 sends instructions to the heating device 391 or the power supply 393, such as sending the first control instruction and/or the second control instruction to the heating device 391, which may directly store or generate the first The control command and/or the second control command are directly sent to the heating device 391, and a special command transmitter can also be instructed to send corresponding commands to the heating device 391 or the power supply 393. The command transmitter is connected with the controller 330 and also connected with the heating device 391. At least one of the device 391 and the power source 393 is connected.

For example, when the instantaneous power of the fan is greater than or equal to the first preset power, the controller 330 sends a power reduction command to the command transmitter. After the instruction transmitter receives the power reduction instruction, it sends an instruction to at least one of the heating device 391 and the power supply 393 to reduce the instantaneous power of the heating device 391 to the second power, and the heating device 391 or power supply 393 receiving the instruction , the instantaneous power of the heating device 391 can be reduced to the second power. Similarly, when the instantaneous power of the fan is less than the third preset power, the controller 330 sends a power increase command to the command transmitter. After the instruction transmitter receives the power increase instruction, it sends an instruction to at least one of the heating device 391 and the power supply 393 to increase the instantaneous power of the heating device 391 to the fourth power, and the heating device 391 or power supply 393, the instantaneous power of the heating device 391 can be increased to the fourth power.

In the embodiment of the present invention, the monitor 310 further includes a current monitoring module, which is used to monitor the instantaneous power of the fan 392 in real time by monitoring the working current of the fan 392 in real time.

The ventilator of the embodiment of the present invention includes a power supply, a heating device and a fan, and also includes the power control system as described above. For the connection relationship and signal transmission relationship among the power supply, heating device, fan, and power control system included in the ventilator of the embodiment of the present invention, please refer to the power control method and power control system of the aforementioned embodiment of the present invention.

In an application example of the ventilator of the present invention, the fan pressurizes the gas in the pipeline, and under normal working conditions, the instantaneous power of the fan is generally kept at a relatively small power value. The fan of a common household ventilator has a power of about 15 watts (W) under normal working conditions. Similarly, the rated power of the heating device in the household ventilator is generally about 30W. When the user suffers from respiratory arrest, the fan is required to provide high-pressure gas to assist in maintaining gas exchange. At this time, the fan needs to speed up the speed in a short time to increase the gas pressure in the pipeline. Correspondingly, the instantaneous power of the fan will quickly rise to about 50W. At this time, the monitor in the ventilator will monitor this change in real time. When the first comparator in the ventilator compares in real time that the instantaneous power of the blower exceeds the preset 30W (that is, the aforementioned first preset power). The controller will reduce the instantaneous power of the heating device to 10W (that is, the aforementioned second power), or directly turn off the power supply to the heating device from the power supply, and the aforementioned second power is 0 at this moment. When the second comparator compares the instantaneous power of the blower fan below 20W (i.e. the aforementioned third preset power), it will increase the instantaneous power of the heating device, and control the heating device to recover to 30W (i.e. the aforementioned fourth power ) power to work.

The embodiment of the present invention adopts the concept of time-sharing control for the fan and heating device in the ventilator. When the fan accelerates, the power of the heating device is appropriately reduced or even stopped, which greatly reduces the power requirement of the power supply. With reference to the aforementioned application example of the present invention, the power (50W) under the accelerated working state of the fan, the instantaneous power of the heating device is 10W (or 0); when both the fan and the heating device are working normally, the fan is about 15W, and the heating device is 30W about. Since the fan and the heating device both work normally, the total energy consumption of the two is about 45W (15W+30W=45W), which is less than the power (50W) under the accelerated working state of the fan, and is also smaller than the power (50W) under the accelerated working state of the fan And the sum of the power (10W or even 0W) of the heating device in the corresponding state. Therefore, the maximum power of the power supply for this ventilator only needs to meet the fan's energy consumption of 50W under the accelerated working state of the fan or the total energy of the fan and the heating device. Consumption of 60W is enough, compared with the power supply in the prior art that needs to meet the requirements of the sum (80W) of the power (50W) under the accelerated working state of the fan and the power (30W) under the normal working state of the heating device, the power supply is reduced. power requirements. If the heating device is stopped directly when the fan speeds up, the power requirement of the power supply can be further reduced.

Those skilled in the art should understand that the various components of the device and/or system provided by the above-mentioned embodiments of the present application, as well as the various steps in the method, can be concentrated on a single computing device, or distributed in multiple computing devices. devices on a network. Alternatively, they may be implemented in program code executable by a computing device. Therefore, they can be stored in a storage device to be executed by a computing device, or they can be fabricated into individual integrated circuit modules, or multiple modules or steps can be fabricated into a single integrated circuit module for implementation. As such, the present invention is not limited to any specific combination of hardware and software.

Although the embodiments disclosed in the present invention are as above, the described content is only an embodiment adopted to facilitate understanding of the technical solution of the present invention, and is not intended to limit the present invention. Anyone skilled in the field of the present invention can make any modifications and changes in the form and details of the implementation without departing from the spirit and scope disclosed by the present invention, but the patent protection scope of the present invention must still be The scope defined by the appended claims shall prevail.

Claims (7)

1. a kind of Poewr control method of lung ventilator, the lung ventilator includes power supply, heater and blower fan, wherein, this method Including：

The power supply is powered for the heater and blower fan simultaneously when, the instantaneous power of the blower fan is monitored in real time；

Compare the instantaneous power and the first predetermined power of the blower fan, first predetermined power is predetermined to be for recognizing blower fan Whether the working condition for apnea situation occur in order to avoid user and instantaneously accelerating is entered；

When the instantaneous power of the blower fan is more than or equal to first predetermined power, the instantaneous work(of the heater is reduced Rate is to the second power；

Compare the instantaneous power and the 3rd predetermined power of the blower fan；

When the instantaneous power of the blower fan is less than three predetermined power, the instantaneous power of the heater is raised to the Four power；

Wherein, first predetermined power is more than or equal to the 3rd predetermined power, and second power is less than the 4th work( Rate；The power of the power supply is configured to match the instantaneous acceleration demand and the heater and blower fan of the blower fan Demand during equal normal work, and need not match simultaneously the blower fan instantaneous acceleration and the heater it is normal The demand of operation.

2. according to the method described in claim 1, it is characterised in that

Second power is 0.

3. according to the method described in claim 1, it is characterised in that：

The instantaneous power of the blower fan is monitored in real time by monitoring the operating current of the blower fan in real time.

4. a kind of power control system of lung ventilator, the lung ventilator includes power supply, heater and blower fan；Wherein, the system Including：

Monitor, when being powered for the power supply for the heater and blower fan simultaneously, monitors the instantaneous of the blower fan in real time Power；

First comparator, instantaneous power and the first predetermined power for comparing the blower fan, first predetermined power is pre- It is set to for recognizing whether blower fan enters the working condition for apnea situation occur in order to avoid user and instantaneously accelerating；

Controller, for when the instantaneous power of the blower fan is more than or equal to first predetermined power, reducing the heating The instantaneous power of device is to the second power；And

Second comparator, instantaneous power and the 3rd predetermined power for comparing the blower fan；

The controller is additionally operable to, when the instantaneous power of the blower fan is less than three predetermined power, raise the heating dress The instantaneous power put is to the 4th power；

Wherein, first predetermined power is more than or equal to the 3rd predetermined power, and second power is less than the 4th work( Rate, the power of the power supply is configured to match the instantaneous acceleration demand and the heater and blower fan of the blower fan Demand during equal normal work, and need not match simultaneously the blower fan instantaneous acceleration and the heater it is normal The demand of operation.

5. system according to claim 4, it is characterised in that：

The controller is used for when the instantaneous power of the blower fan is more than or equal to first predetermined power, and reduction is described to be added The instantaneous power of thermal is to 0.

6. system according to claim 4, it is characterised in that：

The monitor includes current monitoring module, the operating current for monitoring the blower fan in real time.

7. a kind of lung ventilator, including power supply, heater and blower fan, in addition to according to any one of claim 4 to 6 Power control system.