CN208911319U - Mask - Google Patents

Abstract

The utility model provides a kind of assisted respiartion mask.In one aspect, the signal generated by fan motor is detected and for opening fan, when which is closed as fan produced by the mechanical movement of fan caused by the breathing of user.On the other hand, a kind of pressure monitor system is realized.It exports the pressure being attached in the mask air chamber of fan using the revolving speed of fan or detection is attached to pressure change in the mask air chamber of fan.This avoids the individual pressure sensors of needs, and determine whether mask is worn using the pressure across mask.

Description

Mask

Technical field

The utility model relates to a kind of breathing equipments of mask form, provide for the wearer to breathing equipment through filtering Air, wherein fan secondary air flow.

Background technique

The World Health Organization (WHO) estimation has 4,000,000 people to die of air pollution every year.A part of this problem is exactly city The open-air quality in city.Wherein top it all off the India city as Delhi, annual level of pollution are more than to suggest water Flat 10 times.It is well known that Pekinese's annual level of pollution is 8.5 times of suggestion level of security.But even if as human relations Earnestly, Eurocities as Paris and Berlin, the level is also above the level that WHO suggests.

Since this problem will not significantly improve in a short time, so the unique method for solving this problem is to wear The mask of more clean air can be provided by filtering by wearing.In order to promote comfort and effect, can be added on mask One or two fan.These fans are turned on during use, and are usually used under constant voltage.For efficiency and longevity Reason is ordered, these fans are usually electricity commutation brushless DC fan.

Wearer had an advantage that using power mask, alleviate lung's receiving due to overcoming in conventional non-powered mask Filter resistance air-breathing caused by light pressure.

In addition, air-breathing also causes slight negative pressure in mask in conventional unpowered mask, cause pollutant leak into In mask, it is able to demonstrate that the leakage is dangerous if these pollutants are noxious materials.Power mask is steady to face conveying Fixed air stream, and slight positive pressure can be for example provided, which can be determined by the resistance of exhalation valve, to ensure to appoint What leakage is outside rather than inside.

If adjusting fan running or speed, there are several advantages.This can be used for during air-breathing and exhalation process Comfort is promoted by more suitably divulging information, or can be used for promoting electrical efficiency.The latter is converted to longer battery life Or increased ventilation.In current design, these two aspects requires to improve.

In order to adjust fan speed, the pressure in mask can be measured, and pressure and pressure change are used equally for controlling Fan.

For example, GB2032284 discloses a kind of respirator, wherein the pressure in mask is by pressure sensor measurement and wind Fan speed changes according to measurement value sensor.

The cost of pressure sensor is very high, and it is therefore desirable to provide a kind of alternatives of monitoring surface internal mask pressure.This pressure Force information can be used for controlling the fan in powered respirators, but be also used as wherein needing any other of pressure information A part of system based on fan.

The mask (Fan-operated masks) of fan operation is battery powered device, it is therefore desirable for power consumption is down to Minimum and holding cost is minimum.One problem is that when mask is not worn, fan may be kept it turning on, and this causes Unnecessary power consumption.It is possible for providing and being exclusively used in the sensor when detection mask is worn, but this will increase breathing mask Cost.

When putting on mask, user would generally start switch to open fan.The switch increases mask cost, occupies sky Between, and it is inconvenient for opening.Autoelectrinic open function will avoid disadvantage.However, this usually this be also required to one it is dedicated Sensor senses the use of mask.

Therefore, it is desirable to a kind of lower solution of the cost for detecting that mask is worn be found, so as to detect From being worn to the conversion that do not worn and/or be never worn to the conversion worn.

Utility model content

The purpose of this utility model is to overcome above-mentioned at least one defect existing in the prior art.

According to using the one aspect of the utility model as the example of foundation, a kind of mask is provided, which includes:

Air chamber；

Filter；

Fan is used to be extracted into inside air chamber by air outside air chamber in sucking air chamber and/or by air Outside air chamber；

Detection circuit is used to detect the induced current as caused by the rotation of fan or voltage when fan is not electrically driven Spike；And

Start-up circuit is used for the electric drive of the output starting fan in response to carrying out self-detection circuit.

The mask designs are opened to realize when mask is worn by detecting electric spike caused by the artificial rotation by fan Dynamic fan.For example, the rotation is caused by wearing mask as user and being breathed by fan when fan is not electrically driven. Then these movements are detected, to automatically turn on fan.This method does not need active sensing mask and is worn, but user Breathing provide energy for sensing function.Sensing function can be inexpensive and be integrated into fan circuit with low power.

Fan is for example including motor and fan blade device.The rotation of motor causes induced current, wherein the motor starting The effect of motor.Motor is for example including Brushless DC motor.

Detection circuit is for example connected to the stator terminal of motor.When the rotor is turning, it is able to detect that induced current fixed It is flowed in subcoil.

Capacitor of the detection circuit for example including high-pass filter and for storing the charge generated by current or voltage spike Device.Charge gathers on the capacitor, executes activation function until there are enough charges to open fan motor.

Start-up circuit activates transistor electricity when the charge stored on capacitor reaches threshold value for example including transistor circuit Road, to activate the driving of motor.

Breaking circuit can also be provided, for by making capacitor discharge stop the electric drive of fan.Therefore, mask can be with Automatic detection is from mask is taken to the conversion for putting on mask and from mask is put on to the conversion for taking mask.When mask is removed When, breaking circuit can be used.

The mask may further include:

For determining the device of the revolving speed of fan；And

Controller, it is suitable for:

The pressure in air chamber or the pressure change in detection air chamber are exported according to the revolving speed of fan；And

Determine whether mask is worn based on derived pressure or pressure change.

This plays the role of pressure monitoring device, this is operable when the fan 33 is operated.By this method, fan speed quilt Substitution (proxy) as pressure measurement.Fan itself can be used to measure fan speed, therefore do not need additional sensing Device.Under normal usage, air chamber can be closed, therefore the pressure oscillation in air chamber will affect the load of fan State, and to change the electrical characteristics of fan.Similarly, the electrical characteristics of fan can determine the characteristic of air chamber, such as empty The volume of air cavity and it be open volume or closed volume.

By determining whether mask is worn, which realizes in the case where not needing any additional sensor Mask is not worn time electric power saving.Specifically, if not detecting the pressure difference across mask, show the two sides of mask All under atmospheric pressure and mask is not worn.In fact, there is no closing or partially enclosed chamber, therefore air Chamber is communicated with atmosphere.If detecting that mask is not worn, fan can be closed.

In this way, fan is used as sensor, for detect mask from by wearing state to not by wearing shape The transformation of state and never by wearing state to by the transformation of wearing state.

Mask may further include the exhaust valve for making air chamber controllably divulge information to outside.Exhaust valve may include The check-valves that passive pressure is adjusted or the electronic controlled valve being actively driven.It is more comfortable that this may be used to mask.In intake period Between, exhaust valve is closed by (either actively or passively) to prevent filtered air to be inhaled into.During expiration, the row of opening Air valve is to discharge the air of exhalation.

Controller can be adapted for being determined according to pressure monitor system the respiratory cycle, and according to the stage of respiratory cycle come Control controlled valve.Therefore, pressure monitoring provides a kind of straightforward procedure of determining expiratory phase, and this method can be for subsequent use in right The time setting of the ventilation valve of mask is controlled, or for determining it is simultaneously therefore whether in use whether mask is worn.

Filter may include the outer wall of air chamber or the filter member that is connected with fan.

The example of another aspect according to the present utility model provides a kind of method for controlling mask, which includes air Chamber, filter and fan, the fan are used to suck air outside air chamber in air chamber and/or by air out of air chamber Portion is extracted into outside, this method comprises:

The detection induced current as caused by the rotation of fan or due to voltage spikes when fan is not electrically driven；And

In response to the induced current or due to voltage spikes detected, start the electric drive of fan.

This method may further include, and close fan if detecting that mask is not worn.For example, this method can To include:

Gas is sucked and/or is extracted out the air chamber of mask using fan；

Determine the revolving speed of fan；

The pressure in air chamber or the pressure change in detection air chamber are exported according to the revolving speed of fan；And

Determine whether mask is worn based on derived pressure or the pressure change detected.

Detailed description of the invention

The example of the utility model will be described in detail with reference to the accompanying drawing figures, in which:

Fig. 1 shows the pressure monitor system for being implemented as a part of mask；

Fig. 2 shows an example of the component of pressure monitor system；

Fig. 3 shows intake period and the rotating signal during exhaling；

Fig. 4 shows the circuit for controlling one electric current in the stator by Brushless DC motor；

The start-up circuit that Fig. 5 shows detection circuit and is applied in the circuit of Fig. 4；

Fig. 6 shows the first operating mask method；And

Fig. 7 shows the second operating mask method.

Specific embodiment

The utility model provides a kind of assisted respiartion mask.In one aspect, pressure monitor system is realized.The revolving speed of fan For exporting pressure or detecting the pressure change in the mask air chamber for being attached to fan.This avoids need individual pressure Sensor.Pressure across mask is used to determine whether mask is worn.On the other hand, the signal that fan motor generates is tested It surveys and for opening fan, mechanical movement caused by the breathing of user is generated when which is closed as fan.

Below with reference to tool, there are two types of the breathing mask systems of different detection functions to describe the utility model.First detection function Energy (its basis for constituting the utility model) is provided pressure monitoring and is detected whether mask is worn using the pressure monitoring, and And it is especially able to detect from being worn to the conversion that do not worn.Second detection function is to be able to detect never to wear (simultaneously And mask fan is closed) to the conversion worn.

Both detection functions, which are intended to, avoids the need for a large amount of power consumptions from any sensor, and does not need significant Additional firmware complexity.

Fig. 1 shows the pressure monitor system for being implemented as a part of mask.

Subject 10 is shown and has worn the nose of covering subject and the mask 12 of mouth.The purpose of mask is inhaled in air It is filtered the air before into subject.For this purpose, mask body itself acts as air filter 16.By air-breathing, Air is inhaled into the air chamber 18 formed by mask.In intake period, due to the low pressure in air chamber 18, the row of such as check-valves Air valve 22 is closed.

When subject exhales outward, air is discharged by exhaust valve 22.Exhaust valve is opened in order to exhale, but Intake period exhaust valve is closed.Fan 20 facilitates the removal that air passes through exhaust valve 22.Preferably, more than exhalation air Air is removed, so that additional air is supplied to face.Due to relative humidity reduction and cooling effect, comfort increases. During expiration, filtered air is prevented to be inhaled by closing exhaust valve.Therefore, the time setting of exhaust valve 22 takes Certainly in the respiratory cycle of subject.Exhaust valve can be the simple passive check-valves operated by the pressure difference across filter 16.So And exhaust valve is also possible to electronic control valve.

If mask is worn, only has raised pressure in air chamber.Especially in air chamber by the face of user In the case where closing.When mask is worn, the pressure in closing chamber will also change according to the respiratory cycle of subject.When by When examination person exhales outward, there will be slight pressure increase, and when the inside air-breathing of subject, there will be slight pressure to reduce.

If fan is driven by constant driving horizontal (i.e. voltage), different leading pressure (prevailing Pressure it) will appear as load different on fan, this is because across the different pressure drops of fan.Then, the load of change Different fan speeds will be generated.

First detection function is based partially on following understanding: the revolving speed of fan is used as replacing for measurement fan pressure at both sides Generation.First detection function is also based partially on following understanding: stress level is determined for whether mask is worn.This is practical new Type creates a kind of mask in conjunction with these Considerations, and when not worn, which can save electric power by closing, And complicated or expensive additional sensor is not needed.

Due to the known pressure (such as atmospheric pressure) in fan side, pressure monitoring realizes the pressure to the fan other side Or the determination of at least pressure change.The other side is, for example, closing chamber, therefore it has the pressure different from atmospheric pressure.So And by detecting that the pressure on the every side of fan is equal, it can determine that the chamber is not closed, but in (fan) two sides Upper connection atmospheric pressure.

Mask is determined for thus, there is no fan speed change not worn and be therefore not used. The information can be used for closing fan to save electric power.

Therefore, pressure monitoring system have for determine rotation speed of the fan device and for from rotation speed of the fan export pressure or Detect the controller of pressure change.

For determining that the device of revolving speed may include the existing output signal from fan motor, or can provide individually Extention of the simple sense circuit as fan.However, using fan itself under any circumstance, therefore volume is not needed Outer sensor.

Fig. 2 shows an example of the component of pressure monitor system.Component identical with Fig. 1 is given identical attached drawing mark Note.

Other than the component shown in Fig. 1, Fig. 2 is also shown controller 30, local battery 32 and for determining fan The device 36 of revolving speed.

Fan 20 includes fan blade 20a and fan motor 20b.In one example, fan motor 20b is electronic commutation Brushless motor, and for determining that the device of revolving speed includes the internal sensor of motor.Electronic commutation brushless DC fan has The internal sensor of the position of rotor is measured, and switches the electric current by coil in a manner of rotor rotation.Therefore, internal to pass Sensor has been arranged on the feedback control realized in this motor to motor speed.

Motor can have output port, and internal sensor output 34 is provided on output port.Therefore there are a kind of ends Mouthful, this carry the signals of suitable determining revolving speed.

Alternatively, for determining that the device of revolving speed may include the ripple on the power supply to motor 20b (ripple) circuit 36 detected.Ripple is caused by switching the electric current by motor coil, due to battery 32 On finite resistance, cause the induction of supply voltage to change.Circuit 36 is for example including high-pass filter, so that only processing fan rotation Turn the signal in frequency band.This provides very simple adjunct circuit, and more much lower than the cost of conventional pressure sensor.

This means that motor can be any design, the two-wire fan including no built-in sensors output terminal.For Brushed DC motor, this also will be effective.

Controller can be based on corresponding pressure information come using rotary speed information, to determine the respiratory cycle.

If exhaust valve 22 is the valve of electronics switching, breath cycle temporal information can be used and come according to breath cycle Stage controls exhaust valve 22.Therefore, pressure monitoring provides a kind of straightforward procedure of determining expiratory phase, then can be with The time setting of the exhaust valve 22 of mask is controlled using this method.

In addition to control exhaust valve, controller can also inhalation or exhale the period during turn off fan.If detection It is not worn to mask, then controller can also turn off fan.This gives mask different operation modes, this can be used for saving Electric power saving.

Horizontal (i.e. voltage) for given driving, due to the load reduction in fan blade, fan speed is lower Across increasing under fan pressure.This causes flowing to increase.Therefore, there are inverse relations between fan speed and pressure difference.

The inverse relation can obtain in a calibration process, or can be provided by fan manufacturer.Calibration process is for example Including analyzing fan speed information within a stage, at this stage period, indicate subject with normal breathing patterns regularly Air-breathing and expiration.Then the fan speed information that can be will be captured is matched with breath cycle, next can be set accordingly Surely the threshold value of air-breathing and expiration is distinguished.

Fig. 3 schematically shows the relationship of rotor-position (as the sensor voltage measured) and time.

It can be according to the frequency of (as caused by the switch events of the motor) AC compounent for the DC voltage for being supplied to fan To measure revolving speed.AC compounent is derived from the curent change that fan is drawn, and curent change is applied in the impedance of power supply.

Fig. 3 is shown, and the signal of intake period is as shown in curve 40, and the signal during expiration is as shown by graph 42.It exhales Frequency reduces during gas, this is because by barometric gradient increase so that caused by the load increase on fan.Therefore, it observes To frequency variation be as caused by fan performance different in the respiratory cycle.

During expiration, fan operation forces air to be discharged from the region between face and mask.Become due to exhaling More easily, comfort enhances.Additional air can also be drawn onto face, it reduce temperature and relative humidity.In air-breathing and Between expiration, since fresh air is inhaled into the space between face and mask to the cooling space, fan operation Increase comfort.

In intake period, exhaust valve is closed by (either actively or passively), and can close fan to save electric power.This Provide a kind of operation mode based on detection breath cycle.

If fan is closed in certain parts of respiratory cycle, and does not therefore provide pressure information, then can be from it The preceding respiratory cycle infers the correct time setting of air-breathing and expiration phase.

For the expiration assisted by fan, need to restore electricity before exhaust valve is again turned on.This ensures next A inspiration-expiration circulation keeps suitably timing, and makes enough pressure and flowing available.

About 30% energy-saving effect can be easily realized in this way, to extend battery life.Alternatively, In order to improve efficiency, the power of fan can increase by 30%.

It is configured by different fans and valve, the measurement realization of rotation speed of the fan is to reaching more high-comfort control.

In the fan arrangement that filter is connected with fan, it is particularly based on the pressure drop across fan and filter, pressure prison Survey the flow resistance that can be used for measuring filter.When mask is not when on the face up to during one section, pressure monitoring can be in opening state It is completed under state.The resistance may be used as the substitution of filter service life.

First detection function as described above provides alternative pressure measuring value using fan, then uses the substitution The pressure measuring value of property is not worn to detect mask.Pressure information can be used for many other functions as described above.It should First detection function needs fan to be in work state, so that it is able to detect from (fan unlatching) is worn to not worn Conversion.When wearing mask again (or for the first time), user can operate manual switch to be again started up fan.

Nevertheless it would be desirable that when mask is worn for the first time, or it is any it is previous automatically shut down after worn When, fan can automatically turn on.Sensor special can be used to realize in this, but this needs sensor special to be permanently in Active state, or at least carry out periodic sensing operation.This will be reintroduced back to complexity mask, and cause not expecting Power consumption.

Above-mentioned second detection function avoids the need for main switch or any sensor.In fact, fan itself is used as again Sensor.By special electronic device, this Detection task can also be executed even if when fan is closed.

When the mask with fan is placed on the face and user starts breathing, even if when being not turned on fan, by It is forced through fan in air, fan also will rotation.Velocity measuring function is to be based on, in the case where fan is closed, without making Rotation is determined with additional sensor.Fan then is opened using the signal, the appropriate operation for mask.

As described above, there is the internal sensor of measurement rotor-position using the fan of electronic commutation Brushless DC motor, And switch the electric current by coil in a manner of rotor rotation.

But when fan is closed, even if fan is mechanically rotated, also there is no signals relevant to rotation speed of the fan.

Fig. 4 shows H-bridge circuit, which serves as inverter, for being given to stator from DC power supply VDD, GND generation The alternating voltage of coil 50.Inverter has one group of switch S1 to S4, to generate alternating voltage at 50 both ends of coil.

When fan is closed, electric signal cannot be obtained from electric wire VDD, GND.However, because fixed when fan is forced rotation Subcoil 50 is mobile relative to the magnet in rotor, so electric signal is generated due to electromagnetic induction.

It, can not be on electric wire because coil is connected to the circuit being usually deactivated when the rotation of no driven fan Measure these inductive signals.Only when electronic switch connects properly, these signals could be measured on the power line.

By using stator coil it is multiple extremely in one extremely on the pulse that directly generates, which can be solved Certainly.

This method is explained with reference to Fig. 5.

H-bridge circuit is arranged between high voltage rail VDD and virtual ground.Virtual ground GND passes through transistor unit Q1 It is connected to lower voltage rail VDD-.

Virtual ground can change between VDD+ and VDD- according to the operating status of circuit.

Fan has ON-OFF control circuit 52, and the fan circuit including switch, coil and control circuit is as power supply Pressure-wire is connected to VDD+ and GND.Control circuit provides switching signal to switch, but in order to avoid keeping Fig. 5 in disorder, is not shown These control signal wires.Control circuit is for example including the Hall sensor sensed for rotor-position.

One coil terminals Co1 provides output to detection circuit 54.Due to being superimposed with DC voltage, in detection circuit The high-pass filter including capacitor C1 and resistor R1 is used between 54 and coil terminals Co1.Arteries and veins from high-pass filter Punching is rectified by diode D2, and makes charge storage in storage C2.

Storage is that transistor unit Q1 (being illustrated as a pair of of Darlington bipolar transistor) establishes base voltage.Storage Capacitor prevents transistor unit from phase quickly opening and closing with pulse.

Once enough charges are stored on the capacitor c 2, since subsequent supply voltage increases at the top of complete VDD+ VDD- voltage swing, transistor unit Q1 will be connected and (form closed circuit) and fan will bring into operation.The operation generates foot Enough pulse keeps fan running.

This provides a very simple embodiment.

In order to use the circuit of Fig. 5 to close fan, such as mask is not worn based on as explained above detecting, It can then drive the base earth of transistor unit Q1 up to the sufficiently long time so that fan stops rotating.Shutdown can be used in this Circuit 51 (transistor for such as making capacitor C2 discharge) Lai Shixian.

For super low-power consumption, switch Q1 can be replaced with MOSFET and optional gate pole amplifier.Digital Logic can be used The signal whether coil rotating signal and mask are worn is transported to gate drivers by circuit.

When fan is closed in Fig. 5, all switch S1 to S4 disconnect (inactive).Wherein absolutely not power supply.

The base voltage of Q1 will be improved to the capacitor C2 pulse charged and is finally turned on.Then by virtual ground The level of GND is pulled low to VDD-.At that time, electric current can flow to VDD- from VDD+.This is supplied to the control circuit 52 of coil and fan Electricity, as long as and voltage it is enough, fan then begins to run.

When C2 is electrically charged and Q1 is connected, breaking circuit 51 is for making capacitor C2 discharge so that fan stops.For example, Npn transistor or FET transistor can be used to keep capacitor C2 short-circuit.Short-circuit signal can be derived from breathing pattern.If Frequency fluctuation is not measured, then capacitor C2 is short-circuited to turn off transistor unit, thus since GND- is towards voltage VDD+ Go up, supply voltage reduces.

Fig. 6 shows a kind of operating mask method, for detecting from being worn to the conversion that do not worn.This method can be with Start alternately through fan is automatically turned at step 56.

Next, this method comprises:

In a step 60, mask air chamber is drawn air into and/or extracted out using fan；

In step 62, the revolving speed of fan is determined；And

In step 64, from the pressure in the revolving speed of fan export air chamber or the pressure change in detection air chamber.

In the step 68, this method includes determining whether mask is worn based on derived pressure or pressure change.Such as Fruit mask is not worn, then the respiratory cycle variation based on Fig. 3 is unobvious, can close fan to save electric power.

This realizes the first detection function being described above.

Therefore, fan speed is used as the substitution of pressure measurement.

This method may include using electronic commutation brushless motor driving fan, and revolving speed is by the internal sensor of motor It determines.Alternatively, revolving speed can be obtained by the ripple on the power supply for the motor for detecting driving fan.

This method may include that the respiratory cycle is determined according to pressure monitor system, as shown in step 66.When use can be automatically controlled When exhaust valve, can be controlled according to the stage of respiratory cycle can electric control exhaust valve.

Fig. 7 shows a kind of operating mask method, for detecting the conversion for being never worn to and being worn.This method packet It includes:

In step 70, when fan is not electrically driven, the induced current as caused by the rotation of fan or voltage are detected Spike；And

In step 72, in response to the induced current or due to voltage spikes that detect, start the electric drive of fan.

This method can further include (subsequent) the closing fan if detecting that mask is not worn.The detection can be with Step 60 based on Fig. 6 arrives step 68.

Similarly, the initial step of the unlatching fan of Fig. 6 can be executed based on the step 70 of the method for Fig. 7 to step 72 56。

Mask can be used for only covering nose and mouth (as shown in Figure 1) or mask can be full-face mask.

Shown example is the mask for filtering surrounding air.However, pressure detecting can be used for being externally supplied (such as Respiratory auxiliary system, such as continuous positive air pressure (CPAP) system) conveying breathing gas mask.

Above-mentioned mask designs have the primary air chamber formed by filtering material, and user sucks air by the primary air chamber.

Alternative mask design has the filter being connected with fan also as described above.In this case, wind Fan helps user to suck air through filter, to reduce exerting oneself for user's breathing.Exhaust valve is discharged the air of exhalation, And intake valve can be set in inlet.

In addition, the utility model can be applied to detection by breathe caused by pressure change, with control intake valve and/or Exhaust valve.Fan needs in this example are turned in intake period, to help user to suck air by in-line filter, but When the exhaust valve is opened, fan can be turned off during expiration.Therefore, derived pressure information can be additionally useful for control wind Fan, not need fan operation time electric power saving.It can also be to mask whether by wearing examinations.

It will be appreciated that the utility model can be applied to many different mask designs, there is the air-breathing of fan auxiliary or exhale Gas, and there is the airtight air chamber by the filter membrane air chamber formed or sealing.

The detection of respiratory cycle is the additional preferred feature used as pressure monitoring performance, but it is optional.

As described above, embodiment utilizes controller, control can be realized using software and/or hardware in several ways Device, to execute required various functions.Processor be using an example of the controller of one or more microprocessors, can be with The microprocessor is programmed using software (for example, microcode), to execute required function.However, controller can be It is realized in the case where with or without the use of processor, and is also implemented as executing specialized hardware and the execution of certain functions The combination of the processor (for example, one or more microprocessors by programming and interlock circuit) of other function.

The example for the controller assemblies that can be used in the various embodiments of the disclosure includes but is not limited to conventional micro- place Manage device, specific integrated circuit (ASIC) and field programmable gate array (FPGA).

In various embodiments, processor or controller can be associated with one or more storage mediums, and storage is situated between Matter such as volatile and non-volatile computer storage (such as RAM, PROM, EPROM and EEPROM).Storage medium can be by One or more program codings, when executing the program in one or more processors and/or controller, which executes institute Need function.Various storage mediums can be fixed in processor or controller, or can be can be portable, so that thereon One or more programs of storage can be loaded into processor or controller.

By research attached drawing, disclosure and appended claims, those skilled in the art practice it is claimed Utility model when be understood that and realize other modifications of the disclosed embodiments.In the claims, word " comprising " is not Exclude other elements or step, and indefinite article "a" or "an" be not excluded for it is multiple.Certain means it is mutually different from Belong to the fact that be described in claim to be not offered as the combination of these means cannot being utilized to obtain advantage.In claim Any appended drawing reference be not necessarily to be construed as limitation range.

Claims (11)

1. a kind of mask characterized by comprising

Air chamber (18)；

Filter (16)；

Fan (20), the fan are used to from the external of the air chamber (18) suck air in the air chamber and/or will Air is extracted into the outside of the air chamber from the inside of the air chamber；

Detection circuit (54), the detection circuit is for detecting when the fan is not electrically driven by the rotation of the fan Caused induced current or due to voltage spikes；And

Start-up circuit (Q1), the start-up circuit are used to start in response to the output from the detection circuit electricity of the fan Driving.

2. mask according to claim 1, which is characterized in that the fan includes motor and fan blade device.

3. mask according to claim 2, which is characterized in that the motor includes Brushless DC motor.

4. mask according to claim 2 or 3, which is characterized in that the detection circuit is connected to the stator of the motor Terminal (Co1).

5. mask according to claim 4, which is characterized in that the detection circuit include high-pass filter (R1, C1) and For storing the capacitor (C2) of the charge generated by the current or voltage spike.

6. mask according to claim 5, which is characterized in that the start-up circuit includes transistor circuit (Q1), works as electricity The charge stored on the container activates the transistor circuit when reaching threshold value, to activate the driving of the motor.

7. mask according to claim 6, which is characterized in that the mask further comprises breaking circuit (51), is used for By making the capacitor discharge stop the electric drive of the fan.

8. mask according to any one of the preceding claims, which is characterized in that further comprise:

For determining the device (34,36) of the revolving speed of the fan；And

Controller (30), the controller are suitable for:

The pressure in the air chamber or the pressure change in the detection air chamber are exported according to the revolving speed of the fan； And

Determine whether the mask is worn based on derived pressure or pressure change.

9. mask according to claim 8, which is characterized in that the controller be suitable for if it is determined that the mask not by The fan is then turned off in wearing.

10. mask according to claim 8 or claim 9, which is characterized in that the mask further comprises for making the air The exhaust valve (22) that chamber (18) is controllably divulged information to outside, wherein the exhaust valve (22) includes the check-valves that passive pressure is adjusted Or the electronic controlled valve being actively driven.

11. mask according to any one of the preceding claims, which is characterized in that the filter may include the sky The outer wall of air cavity or the filter member being connected with the fan.