CN107261276B - Heating system of breathing machine and breathing machine - Google Patents

Heating system of breathing machine and breathing machine Download PDF

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Publication number
CN107261276B
CN107261276B CN201710517876.7A CN201710517876A CN107261276B CN 107261276 B CN107261276 B CN 107261276B CN 201710517876 A CN201710517876 A CN 201710517876A CN 107261276 B CN107261276 B CN 107261276B
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heating system
heating unit
humidifier
heating
semiconductor device
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CN201710517876.7A
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CN107261276A (en
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齐丹
易萍虎
庄志
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Xi'an yenisai Electronic Technology Co., Ltd
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BMC Medical Co Ltd
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/0003—Accessories therefor, e.g. sensors, vibrators, negative pressure
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M16/00—Devices for influencing the respiratory system of patients by gas treatment, e.g. mouth-to-mouth respiration; Tracheal tubes
    • A61M16/10—Preparation of respiratory gases or vapours
    • A61M16/14—Preparation of respiratory gases or vapours by mixing different fluids, one of them being in a liquid phase
    • A61M16/16—Devices to humidify the respiration air
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/36—General characteristics of the apparatus related to heating or cooling
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61M—DEVICES FOR INTRODUCING MEDIA INTO, OR ONTO, THE BODY; DEVICES FOR TRANSDUCING BODY MEDIA OR FOR TAKING MEDIA FROM THE BODY; DEVICES FOR PRODUCING OR ENDING SLEEP OR STUPOR
    • A61M2205/00—General characteristics of the apparatus
    • A61M2205/36—General characteristics of the apparatus related to heating or cooling
    • A61M2205/3673—General characteristics of the apparatus related to heating or cooling thermo-electric, e.g. Peltier effect, thermocouples, semi-conductors

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  • Health & Medical Sciences (AREA)
  • Emergency Medicine (AREA)
  • Pulmonology (AREA)
  • Engineering & Computer Science (AREA)
  • Anesthesiology (AREA)
  • Biomedical Technology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Hematology (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Animal Behavior & Ethology (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Veterinary Medicine (AREA)
  • Air Humidification (AREA)
  • Stopping Of Electric Motors (AREA)

Abstract

The invention discloses a heating system of a breathing machine and the breathing machine, wherein the breathing machine comprises a humidifier, the heating system comprises a motor and a heating unit, the heating unit comprises a semiconductor device, and the semiconductor device is arranged to convert electric energy generated in the braking process of the motor into heat energy so as to heat liquid in the humidifier. By the heating system of the breathing machine, the braking feedback energy generated by the motor can be converted into heat energy to heat the liquid in the humidifier, so that the temperature rising speed of the liquid in the humidifier is accelerated, and the reaction time of the humidifier for achieving the expected humidifying effect is shortened; the purposes of recycling energy and saving energy are achieved; the semiconductor device that the heating unit adopted is with low costs, small, can save this heating system's circuit space, and all is provided with the fin on the shell of semiconductor device, can be with in the heat quick conduction to the humidifier of its production, avoids heating system's temperature to rise continuously.

Description

Heating system of breathing machine and breathing machine
Technical Field
The invention relates to the technical field of respirators, in particular to a heating system of a respirator and the respirator.
Background
The ventilator is intended to be used in medical environments such as families or hospitals and the like, is medical equipment for treating respiratory failure, respiratory insufficiency, Sleep Apnea Syndrome (SAS) and related diseases, and generally comprises a motor, a heating unit and a humidifier, wherein the motor is used as a driving part, converts electric energy into kinetic energy, and provides gas with certain pressure and flow rate for patients; the bottom of the existing humidifier is provided with a heat conduction material for conducting heat, a heating unit is arranged on the heat conduction material, the heating unit converts electric energy provided by a power supply into heat energy and conducts the heat energy to liquid in the humidifier through the heat conduction material, so that the temperature of the liquid is increased, the evaporation rate of the liquid is accelerated, the humidity of gas provided to a patient end is changed, and the gas is humidified.
However, the existing humidifier has the problems that the temperature rises slowly after the existing humidifier is filled with water at full scale, and the reaction time for achieving the expected humidification effect is too long.
The motor follows the electromagnetic induction rule, when the motor runs, the coil induces electromotive force, and the electromotive force is in direct proportion to the motor speed. The motor is used as an electromechanical conversion device, and when the induced electromotive force is greater than the working voltage of the motor, the motor enters a generator braking state to convert redundant kinetic energy into electric energy. If the energy cannot be well consumed, the temperature of the breathing machine is increased, the service life of the breathing machine is shortened, and devices are burnt out.
Disclosure of Invention
An object of the present invention is to provide a new solution to the problem of the ventilator being damaged by the fact that the electric energy generated by the motor braking is not consumed.
According to a first aspect of the present invention, there is provided a heating system for a ventilator, the ventilator comprising a humidifier, the heating system comprising a motor and a heating unit, the heating unit comprising a semiconductor device arranged to convert electrical energy generated by the motor during braking into thermal energy for heating a liquid in the humidifier.
Optionally, the heating unit further includes a heat conducting material, the semiconductor device is disposed on the heat conducting material, and the heat energy converted by the semiconductor device heats the liquid in the humidifier through the heat conducting material.
Optionally, the heating system further comprises an energy storage element configured to store the electrical energy and release at least part of the electrical energy to the semiconductor device.
Optionally, the energy storage element is a capacitor.
Optionally, the energy storage element, the motor and the heating unit are connected in parallel between a power supply end and a ground end of the energy feedback brake heating system.
Optionally, the semiconductor device is a P-type darlington tube, the heating unit further includes a first resistor, an emitter of the P-type darlington tube is connected to the power supply end, a collector of the P-type darlington tube is connected to the ground terminal, and a base of the P-type darlington tube is connected to the ground terminal through the first resistor.
Optionally, the heating unit further includes a zener diode, the zener diode is connected between the base of the P-type darlington tube and the ground terminal, wherein an anode of the zener diode is connected to the ground terminal.
Optionally, the semiconductor device is an N-type darlington tube, the heating unit further includes a second resistor, an emitter of the N-type darlington tube is connected to the ground terminal, a collector of the N-type darlington tube is connected to the power supply terminal, and a base of the N-type darlington tube is connected to the power supply terminal through the second resistor.
Optionally, the heating unit further includes a zener diode, the zener diode is connected between the base of the N-type darlington tube and the power supply terminal, wherein an anode of the zener diode is connected to the base.
Optionally, the heating unit is further configured to convert electrical energy provided by a power end of the heating system into thermal energy to heat the liquid in the humidifier.
According to a second aspect of the invention there is provided a ventilator comprising a heating system according to the first aspect of the invention.
The inventor of the present invention has found that in the prior art, there is a problem that the electrical energy generated by the motor brake is not consumed and will cause damage to the ventilator. Therefore, the technical task to be achieved or the technical problems to be solved by the present invention are never thought or anticipated by those skilled in the art, and therefore the present invention is a new technical solution.
The heating system of the breathing machine has the advantages that the heating system of the breathing machine can convert electric energy generated by the motor in the braking process into heat energy to heat liquid in the humidifier, so that the purposes of recycling braking feedback energy of the motor and saving energy are achieved. The semiconductor device that the heating unit adopted is with low costs, small, can save this heating system's circuit space, and all is provided with the fin on the shell of semiconductor device, can be with in the heat quick conduction to the humidifier of its production, avoids heating system's temperature to rise continuously.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a block schematic diagram of one embodiment of a heating system for a ventilator in accordance with the present invention;
FIG. 2 is a block schematic diagram of another embodiment of a heating system for a ventilator in accordance with the present invention;
FIG. 3 is a schematic circuit diagram of one embodiment of a heating unit according to the present invention;
fig. 4 is a schematic circuit diagram of another embodiment of the heating unit according to the present invention.
Description of reference numerals:
u1-motor; u2-heating unit;
u3-energy storage element; d1-zener diode;
r1, R2-resistance; Q1-P type Darlington tube;
e 1-the emitter of the P-type Darlington tube; b 1-the base electrode of the P type Darlington tube;
c 1-the collector of the P type Darlington tube; Q2-N Darlington tube;
e 2-the emitter of the Darlington tube of type N; b 2-the base electrode of the N-type Darlington tube;
c 2-collector of N-type Darlington tube; VCC-power supply terminal;
GND-ground; p1-first connection point;
p2-second connection point.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
In order to solve the problem that the electric energy generated by the motor braking in the prior art is not consumed to damage the breathing machine, a heating system of the breathing machine is provided. Wherein, this breathing machine includes the humidifier.
As shown in fig. 1, the heating system comprises a motor U1 and a heating unit U2, the heating unit U2 comprising semiconductor devices arranged to convert electrical energy generated during braking of the motor U1 into thermal energy for heating the liquid in the humidifier U3. The motor U1 can convert mechanical energy into electrical energy during braking, which is feedback energy for braking the motor.
Therefore, the heating system of the breathing machine can convert the electric energy generated by braking the motor into heat energy to heat the liquid in the humidifier, realizes the recycling of the braking feedback energy of the motor, and can effectively inhibit the problem that the output efficiency is reduced because the temperature of the motor is increased because the electric energy is not timely released and applied to the motor; the temperature of other circuits and a motor of the breathing machine can be effectively reduced, and the service life of the breathing machine is prolonged; and energy consumption can be reduced, and cost is indirectly reduced.
The heating unit U2 can also be used to convert the electric energy provided by the power source terminal VCC of the heating system into heat energy to heat the liquid in the humidifier U3, so as to ensure the humidifying capability of the humidifier U3. Specifically, the heating unit U2 can heat the liquid in the humidifier U3 through the heating unit U2, regardless of whether the motor U1 is braking to generate electric power, when receiving the electric power provided by the power source terminal VCC. The element of the heating unit U2 for converting the electric energy supplied from the power source terminal VCC into heat energy and the element of the heating unit U1 for converting the electric energy generated during braking into heat energy may be the same or different. The power supply terminal VCC is also used to supply a supply voltage to the motor U1. Therefore, the heating system of the embodiment can accelerate the temperature rise speed of the liquid in the humidifier, and further shorten the reaction time of the humidifier for achieving the expected humidification effect.
Specifically, the semiconductor device may be, for example, an N-type transistor, a P-type transistor, an N-channel MOS transistor, a P-channel MOS transistor, an N-type darlington transistor, a P-type darlington transistor, or an insulated gate bipolar transistor. Compared with a regenerative resistor structure controlled by a brake switch, the semiconductor device has the advantages of low cost, small volume, simple circuit structure and the like, and can save the circuit space of the heating system; and all be provided with the fin on semiconductor device's the shell, can conduct the heat of its conversion to the humidifier in fast, avoid the heat energy that the heating unit conversion makes heating system's temperature rise, and then lead to the problem that energy feedback system's circuit takes place to damage to take place.
Further, the heating system may further include an energy storage element U4, the energy storage element U4 being configured to store electrical energy generated during braking of the motor and to discharge at least a portion of the electrical energy to the semiconductor device. The energy storage element U4 may be, for example, a capacitor, an inductor, or a chemical battery. Thus, the utilization rate of the electric energy can be further improved by the energy storage element U4.
On the basis, as shown in fig. 2, the energy storage element U4, the motor U1 and the heating unit U2 may be connected in parallel between a power supply terminal VCC and a ground terminal GND of the heating system. The power supply voltage provided by the power supply terminal VCC is the working voltage of the motor U1. The electric energy generated by the motor braking can be output to the energy storage element U4 for storage and also can be output to the heating unit U2 for reuse.
Because the amplification factor of the Darlington tube is larger than that of the common triode, the semiconductor device can be the Darlington tube, and the utilization rate of the braking feedback energy of the motor can be further improved.
Specifically, in the braking process of the motor U1, the electric energy generated by the motor U1 is fed back to the power supply terminal VCC, electromotive force is generated at two ends of the motor U1, so that the voltage of the power supply terminal VCC is increased, the voltage of the power supply terminal VCC is the sum of the supply voltage for ensuring the normal operation of the motor U1 and the electromotive force generated by the braking of the motor U1, the supply voltage and the electric energy of the electromotive force can both be stored in the energy storage element U4, and when the voltage of the power supply terminal VCC is increased to be higher than the turn-on voltage of the heating unit U2, the heating unit U2 starts to convert the part of the electric energy higher than the turn-.
In the first embodiment of the present invention, as shown in fig. 3, the semiconductor device is a P-type darlington transistor Q1, the heating unit U2 further includes a first resistor R1, an emitter e1 of the P-type darlington transistor Q1 is connected to a power supply terminal VCC, a collector c1 of the P-type darlington transistor Q1 is connected to a ground terminal GND, and a base b1 of the P-type darlington transistor Q1 is connected to the ground terminal GND through a first resistor R1. The first resistor R1 can play a role in overcurrent protection, and prevent the semiconductor device from being damaged by overcurrent. In order to reduce the waste of power, the resistance of the first resistor R1 can be small, so that the power consumption of the first resistor R1 can be reduced.
Specifically, the motor U1 converts mechanical energy into electrical energy during braking, the voltage of the power source terminal VCC increases, that is, the voltage of the emitter e1 of the P-type darlington tube Q1 increases, and further the voltage of the base b1 of the P-type darlington tube Q1 also increases, when the starting voltage of the P-type darlington tube Q1 is reached, the P-type darlington tube Q1 is turned on to generate heat, the electrical energy generated by the motor U1 is consumed, and the P-type darlington tube Q1 operates in a linear region, then the current of the emitter e1 is β times the current of the base b1, where β is the current amplification factor of the P-type darlington tube Q1, for example, may be 100, so that the power consumption of the heating unit U2 mainly occurs in the P-type darlington tube Q1, the power consumption of the first resistor R1 is negligible, and thus the utilization rate of energy can be improved, and the P-type darlington tube Q1 operates in a linear region, and the heating unit Q2 can obtain a more accurate starting voltage of the heating unit 36, the recycling of the electric energy is conveniently and accurately controlled. When the motor U1 stops braking, the voltage of the power supply terminal VCC drops, that is, the voltage of the emitter e1 of the P-type darlington tube Q1 drops, and when the voltage of the emitter e1 is less than the turn-on voltage of the heating unit, the P-type darlington tube Q1 is turned off.
In the second embodiment of the present invention, as shown in fig. 4, the semiconductor device is an N-type darlington transistor Q2, the heating unit U2 further includes a second resistor R2, an emitter e1 of the N-type darlington transistor Q2 is connected to a ground terminal GND, a collector c2 of the N-type darlington transistor Q2 is connected to a power supply terminal VCC, and a base b2 of the N-type darlington transistor Q2 is connected to the power supply terminal VCC through a second resistor R2. The second resistor R2 can play a role in overcurrent protection, so that the semiconductor device is prevented from being damaged by overcurrent. In order to reduce the waste of power, the resistance of the second resistor R2 can be small, so that the power consumption of the second resistor R2 can be reduced.
Specifically, the motor U1 converts mechanical energy into electrical energy during braking, the voltage of the power supply terminal VCC increases, when the voltage reaches the turn-on voltage of the N-type darlington tube Q2, the N-type darlington tube Q2 is turned on to generate heat, the electrical energy generated by the motor U1 is consumed, and the N-type darlington tube Q2 operates in a linear region, then the current of the emitter e1 is β times of the current of the base b1, where β is a current amplification factor of the N-type darlington tube Q2, and may be 100, for example, so that the power consumption of the heating unit is mainly generated on the N-type darlington tube Q2, and the power consumption of the first resistor R1 is small and negligible, thus, the utilization rate of energy can be improved, and the N-type darlington tube Q2 operates in the linear region, so that a more accurate turn-on voltage of the heating unit can be obtained, and accurate control of reuse of electromotive force can be conveniently achieved. When the motor stops braking, the voltage of the power supply terminal VCC is reduced to be less than the starting voltage of the heating unit, and the N-type Darlington tubes Q2 are all cut off.
Further, in order to enable the heating unit U2 to heat the liquid in the humidifier only when the motor U1 generates electric power, the turn-on voltage of the heating unit U2 may be higher than the power supply voltage provided by the power supply terminal VCC. Since the supply voltage provided by the power source terminal VCC may be unstable and fluctuate within a certain range, in order to prevent the heating unit U2 from heating the liquid in the humidifier U3 when the motor U1 is not generating electric power, the turn-on voltage of the heating unit U2 may be higher than the maximum value of the fluctuation of the supply voltage provided by the power source terminal VCC.
On this basis, the heating unit U2 further includes a zener diode D1, and in the first embodiment of the present invention, as shown in fig. 3, the zener diode D1 is connected between the base b1 of the P-type darlington Q1 and the ground terminal GND, wherein the anode of the zener diode D1 is connected to the ground terminal GND. In the second embodiment of the present invention, as shown in fig. 4, the zener diode D1 is connected between the base b2 of the N-type darlington Q2 and the power supply terminal VCC, wherein the anode of the zener diode D1 is connected to the base b2 of the N-type darlington Q2. Thus, the sum of the breakdown voltage of the zener diode D1 and the turn-on voltage of the darlington tube is the turn-on voltage of the heating unit U2.
For example, in the case that the supply voltage provided by the power supply terminal VCC is 24V, the zener diode D1 with a breakdown voltage of 27V may be selected, and the P-type darlington tube Q1 with a breakdown voltage of 1.5V is turned on, so that when the voltage of the electromotive force is greater than 4.5V, that is, the voltage of the power supply terminal VCC increases to exceed 28.5V, both the zener diode D1 and the P-type darlington tube Q1 are turned on, and as the electromotive force increases, the P-type darlington tube Q1 operates in a linear region, starts to consume the electric energy of the electromotive force, and converts the electric energy of the electromotive force into heat energy to heat the liquid in the humidifier U3.
Therefore, the circuit design of the heating unit is more flexible, and the voltage-stabilizing tubes D1 with different breakdown voltages can be adopted to flexibly set the threshold value for reusing the electromotive force at the two ends of the motor U1 according to different requirements, namely the voltage of the starting voltage of the heating unit U2 can be flexibly adjusted, so that the electric energy generated by the motor U1 can be reused when the voltage of the power supply terminal VCC reaches the starting voltage value.
Further, the heating unit further comprises a heat conducting material, a semiconductor device is arranged on the heat conducting material, and heat energy generated by the semiconductor device is arranged to be conducted to the liquid in the humidifier U3 through the heat conducting material so as to heat the liquid in the humidifier U3.
On this basis, the heat conductive material may be, for example, an aluminum substrate or a metal film.
The aluminum substrate is a metal-based copper-clad plate with good heat dissipation function, and a single-sided board generally comprises a three-layer structure, namely a circuit layer (copper foil), an insulating layer and a metal base layer. Semiconductor device can set up the circuit layer at aluminium base board, and the heat that semiconductor device produced conducts metal-based layer fast through the insulating layer, then is gone out the heat transfer by metal-based layer to the realization is to thermal quick conduction.
Therefore, the heating rate of the liquid in the humidifier is further increased, and the utilization rate of the motor brake feedback energy is further improved.
The invention also provides a breathing machine which comprises the heating system. The heating system can be arranged on a gas pipeline of the respirator, so that the respirator can realize the recycling of motor braking feedback energy.
The above embodiments mainly focus on differences from other embodiments, but it should be clear to those skilled in the art that the above embodiments can be used alone or in combination with each other as needed.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims (8)

1. A heating system of a ventilator, the ventilator comprising a humidifier, the heating system comprising a motor and a heating unit, the heating unit comprising a semiconductor device arranged to convert electrical energy generated by the motor during braking into thermal energy to heat liquid in the humidifier;
the heating system further comprises an energy storage element arranged to store the electrical energy and to release at least part of the electrical energy to the semiconductor device;
the semiconductor device is a P-type Darlington tube, the heating unit further comprises a first resistor, an emitting electrode of the P-type Darlington tube is connected with a power supply end of the heating system, a collector electrode of the P-type Darlington tube is connected with a grounding end of the heating system, and a base electrode of the P-type Darlington tube is connected with the grounding end through the first resistor; or, the semiconductor device is an N-type Darlington tube, the heating unit further comprises a second resistor, an emitting electrode of the N-type Darlington tube is connected with a grounding end of the heating system, a collecting electrode of the N-type Darlington tube is connected with a power end of the heating system, and a base electrode of the N-type Darlington tube is connected with the power end through the second resistor.
2. The heating system of claim 1, wherein the heating unit further comprises a thermally conductive material on which the semiconductor device is disposed, the thermal energy converted by the semiconductor device heating the liquid within the humidifier via the thermally conductive material.
3. The heating system of claim 1, wherein the energy storage element is a capacitor.
4. The heating system of claim 1, wherein the energy storage element, the motor, and the heating unit are connected in parallel between a power terminal and a ground terminal of the heating system.
5. The heating system of claim 1, wherein the heating unit further comprises a zener diode connected between the base of the P-type darlington tube and the ground, wherein an anode of the zener diode is connected to the ground.
6. The heating system of claim 1, wherein the heating unit further comprises a zener diode connected between the base of the N-type darlington tube and the power supply terminal, wherein an anode of the zener diode is connected to the base.
7. The heating system according to any one of claims 1 to 6, wherein the heating unit is further configured to convert electrical energy provided by power terminals of the heating system into thermal energy for heating the liquid in the humidifier.
8. A ventilator comprising a heating system according to any one of claims 1-7.
CN201710517876.7A 2017-06-29 2017-06-29 Heating system of breathing machine and breathing machine Active CN107261276B (en)

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