A ventilation device

Abstract

A ventilation device, its power supply device includes an AC-DC module and at least one charging circuit; the AC-DC module is used to convert the input AC into DC to power the charging circuit and each electrical device; the charging circuit is used to connect with the rechargeable battery to charge the rechargeable battery, the rechargeable battery can power each electrical device; the charging circuit also obtains the total power output by the AC-DC module, and adjusts the charging power of the rechargeable battery based on the total power.

Description

Technical Field

[0001] This invention relates to a ventilation device. Background Technology

[0002] Human respiration refers to the periodic and rhythmic inhalation and exhalation of air, absorbing oxygen and expelling carbon dioxide, thereby achieving gas exchange. When some patients are unable to breathe spontaneously, mechanical ventilation can be used to assist them in breathing; for example, in cases where patients do not breathe spontaneously, external ventilation devices such as ventilators can usually provide respiratory support. As can be seen, mechanical ventilation is a ventilation method that uses mechanical devices to replace, control, or alter a patient's spontaneous breathing movements.

[0003] Ventilation equipment involves many electrical components and modules. Abnormal power supply can affect the operation of ventilation equipment. Therefore, the power supply of ventilation equipment is a very serious and worthwhile issue to study. Summary of the Invention

[0004] This invention discloses a ventilation device, which is described in detail below.

[0005] One embodiment provides a ventilation device, comprising: At least one ventilation function module, each ventilation function module is used to perform at least one function required for the ventilation equipment to perform mechanical ventilation; the at least one ventilation function module includes one or more electrical devices; The power supply device includes an AC-to-DC module and at least one charging circuit; the AC-to-DC module is used to convert input AC power into DC power to supply power to the charging circuit and various electrical devices; the charging circuit is used to connect to a rechargeable battery to charge the rechargeable battery, which can supply power to various electrical devices; the charging circuit also acquires the total power output of the AC-to-DC module and adjusts the charging power of the rechargeable battery based on the total power.

[0006] In one embodiment, when the total power reaches the maximum output power of the AC-to-DC module, the charging circuit reduces the charging power of the rechargeable battery.

[0007] In one embodiment, the ventilation device further includes a first current sampling circuit, which is used to sample the output current of the AC-to-DC module and send the sampled signal to the charging circuit, which calculates the total output power of the AC-to-DC module based on the signal.

[0008] In one embodiment, the charging circuit has two paths; each charging circuit corresponds to a first current sampling circuit; the first current sampling circuits are connected in parallel to form a parallel circuit, which is connected in series to the output bus of the AC to DC module; the first current sampling circuit includes: a resistor R1 and a resistor R2 connected in series; the first current sampling circuit sends the voltage across one of the resistors R1 and R2 as the signal to the corresponding charging circuit.

[0009] In one embodiment, the power supply device further includes a first DC-to-DC module and at least one second DC-to-DC module; the one or more electrical devices include a pressure generating device and one or more power supply devices that must be rated. The second DC-to-DC module is used to obtain power from the DC power output by the AC-to-DC module or the rechargeable battery, and to supply power to the required rated power supply device; The first DC-to-DC module is used to obtain power from the DC power output by the AC-to-DC module or the rechargeable battery, and to power the pressure generating device; the first DC-to-DC module also obtains the total power supplied by each electrical device, and adjusts the power supply of the pressure generating device based on the total power supplied by each electrical device.

[0010] In one embodiment, the ventilation device further includes a second current sampling circuit, which is used to sample the total current supplying power to each electrical device and send the sampled signal to the first DC-to-DC module. The first DC-to-DC module calculates the total power supply to each electrical device based on the signal.

[0011] In one embodiment, the second current sampling circuit includes resistors R1, R2, R3, R4, and R5; One end of resistor R2 is connected to the power supply line of the AC to DC module that supplies power to each electrical device, and is also connected to one end of resistor R1; the other end of resistor R2 is connected to one end of resistor R3, the other end of resistor R3 is connected to one end of resistor R5, and the other end of resistor R5 is connected to one end of resistor R4. The other end of resistor R2 is also connected to the power supply line that supplies power to each electrical device via the rechargeable battery; the other end of resistor R1 is connected to the main power supply line that supplies power to each electrical device. The end of resistor R4 that is not connected to resistor R5 is connected to the end of resistor R1 that is not connected to resistor R2. The voltage across resistor R5 is sent as the signal to the first DC-to-DC module.

[0012] In one embodiment, the first DC-to-DC module adjusts the power supply of the pressure generating device based on the total power supplied by each electrical device, including: the first DC-to-DC module adjusts the power supply of the pressure generating device according to a preset relationship between the signal and the power supply of the pressure generating device, wherein the preset relationship is a positive correlation.

[0013] In one embodiment, a switching circuit is connected in series on the power supply line that supplies power to each electrical device via the rechargeable battery, and the switching circuit is in the off state when the ventilation equipment is turned off.

[0014] In one embodiment, the switching circuit includes a P-type MOS transistor.

[0015] According to the ventilation device of the above embodiment, dynamic power allocation is introduced. The charging circuit obtains the total power output of the AC to DC module and adjusts the charging power of the rechargeable battery based on the total power output of the AC to DC module. For example, when the total power output of the AC to DC module reaches the maximum output power of the AC to DC module, the charging circuit reduces the charging power of the rechargeable battery, thereby increasing the power supply allocated to the electrical devices involved in the ventilation function module. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a ventilation device according to one embodiment; Figure 2 This is a schematic diagram of the structure of a ventilator according to one embodiment; Figure 3 This is a schematic diagram of the structure of an anesthesia machine according to one embodiment; Figure 4 This is a schematic diagram of the structure of a ventilation device according to one embodiment; Figure 5 This is a schematic diagram of the structure of a ventilation device according to one embodiment; Figure 6 This is a schematic diagram of the structure of a ventilation device according to one embodiment; Figure 7 This is a schematic diagram of the structure of a first current sampling circuit according to one embodiment; Figure 8 This is a schematic diagram of the structure of a ventilation device according to one embodiment; Figure 9 This is a schematic diagram of the structure of a ventilation device according to one embodiment; Figure 10 This is a schematic diagram of the structure of a ventilation device according to one embodiment; Figure 11 This is a schematic diagram of the structure of a ventilation device according to one embodiment; Figure 12 This is a schematic diagram of the structure of a power supply device according to one embodiment; Figure 13 This is a schematic diagram of the structure of a first current sampling circuit according to one embodiment; Figure 14 This is a schematic diagram of the structure of a second current sampling circuit according to one embodiment; Figure 15 This is a schematic diagram of the structure of a second current sampling circuit according to one embodiment. Detailed Implementation

[0017] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0018] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0019] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0020] Power supply for ventilation equipment is a crucial yet often overlooked issue. Generally, the higher the power output, the better. However, this places new demands on the power provider and, typically, on the ventilation equipment itself. For instance, a higher power supply requires a higher-power AC-DC module, which occupies more internal space, increases costs, and, more importantly, may prevent the system from fully utilizing the increased power.

[0021] Considering the above factors, the inventor conducted research and innovation. After studying the various electrical modules (or electrical components, electrical devices) in the ventilation equipment, the inventor roughly divided the electrical modules into two major categories or three subcategories: 1. Electrical modules unrelated to the mechanical ventilation function of the ventilation equipment, such as a backup battery (rechargeable). The ventilation equipment is used to help patients breathe through mechanical ventilation. Therefore, in addition to being powered by mains power, it is also equipped with a backup battery. When the mains power is normal, the ventilation equipment uses mains power for both normal operation and to charge the backup battery. In this way, when the mains power fails, it can be powered by the backup battery. Second, electrical modules related to the mechanical ventilation function of ventilation equipment can be further divided into two categories. One category consists of electrical modules that require sufficient power to operate (let's call them modules, components, or devices that require a rated power supply), such as ventilation protection circuits, control circuits, display circuits, and related circuits of solenoid valves. If the power supply to these electrical modules is insufficient, they may not be able to work properly. The other category consists of electrical modules that, although insufficient power supply will have an impact, can still work relatively normally, such as the motor of the ventilation equipment. When the power supply to these electrical modules is insufficient, although the performance will decrease, it will not significantly affect their function.

[0022] Based on the above division of power modules, this application prioritizes ensuring the power supply of power modules related to the mechanical ventilation function of the ventilation equipment. Furthermore, among the power supply modules related to the mechanical ventilation function of the ventilation equipment, priority is given to ensuring the power supply of modules that must be rated for power supply, as will be explained in detail below.

[0023] The ventilation equipment involved in this application refers to equipment that assists patients in breathing through mechanical ventilation, such as a ventilator or anesthesia machine. Please refer to... Figure 1 In some embodiments of this application, the ventilation device includes at least one ventilation function module 1000 and a power supply device 2000. Each ventilation function module 1000 is used to perform at least one function required for the ventilation device to perform mechanical ventilation; the ventilation function module 1000 contains one or more electrical devices; it is understood that, in this document, an electrical device refers to a device that needs to be powered to operate. In some embodiments, these one or more electrical devices include a pressure generating device and one or more mandatory rated power supply devices; the mandatory rated power supply devices have been described above and will not be repeated here. The pressure generating device refers to a device used to generate pressure during mechanical ventilation, such as a turbine motor. The power supply device 2000 is used to supply power to the ventilation device, or to supply power to the electrical devices in the ventilation device.

[0024] The ventilation function module 1000 will be explained below in conjunction with the specific functions implemented by the ventilation equipment.

[0025] In some embodiments, the ventilation equipment may be a ventilator, which is an artificial mechanical ventilation device used to assist or control a patient's spontaneous breathing movements to achieve gas exchange in the lungs, reduce the body's energy expenditure, and facilitate the recovery of respiratory function. Please refer to... Figure 2 In some embodiments, the ventilation device may include a breathing interface 211, an air source interface 212, a breathing circuit, a breathing assist device, a processor 50, a display 70, and a power supply device 2000.

[0026] The breathing circuit selectively connects the gas source interface 212 to the patient's respiratory system. In some embodiments, the breathing circuit includes an expiratory branch 213a and an inspiratory branch 213b. The expiratory branch 213a connects the breathing interface 211 and the exhaust port 213c, and is used to guide the patient's exhaled air to the exhaust port 213c. The exhaust port 213c can be connected to the external environment or to a dedicated gas recovery device. The gas source interface 212 is used to connect to a gas source (not shown in the figure), which provides gas, typically oxygen or air. In some embodiments, the gas source can be a compressed gas cylinder or a central gas supply source, supplying gas to the ventilator through the gas source interface 212. The supplied gas type can be oxygen (O2) or air. In some embodiments, the gas source can be an external gas source; in some embodiments, a gas source can also be provided inside the ventilation device. The gas supply interface 212 may include conventional components such as a pressure gauge, pressure regulator, flow meter, pressure reducing valve, and air-oxygen ratio control and protection device, which are used to control the flow rate of various gases (e.g., oxygen and air). The inspiratory branch 213b connects the breathing interface 211 and the gas supply interface 212 to provide oxygen or air to the patient. For example, gas input from the gas supply interface 212 enters the inspiratory branch 213b and then enters the patient's lungs through the breathing interface 211. The breathing interface 211 connects the patient to the breathing circuit. In addition to introducing gas from the inspiratory branch 213b to the patient, it can also introduce the patient's exhaled gas through the expiratory branch 213a to the exhaust port 213c. Depending on the situation, the breathing interface 211 may be a nasal cannula or a mask worn over the mouth and nose. The respiratory assist device is connected to the gas source interface 212 and the breathing circuit, controlling the delivery of gas supplied by an external gas source to the patient through the breathing circuit. In some embodiments, the respiratory assist device may include an expiratory controller 214a and an inspiratory controller 214b. The expiratory controller 214a is disposed on the expiratory branch 213a and is used to connect or disconnect the expiratory branch 213a according to control commands, or to control the flow rate or pressure of the patient's exhaled gas. In specific implementations, the expiratory controller 214a may include one or more devices capable of controlling flow rate or pressure, such as an expiratory valve, a one-way valve, a flow controller, or a PEEP valve. The inspiratory controller 214b is disposed on the inspiratory branch 213b and is used to connect or disconnect the inspiratory branch 213b according to control commands, or to control the flow rate or pressure of the output gas. In specific implementations, the inspiratory controller 214b may include one or more devices capable of controlling flow rate or pressure, such as an inspiratory valve, a one-way valve, or a flow controller.

[0027] In some embodiments, the processor 50 is used to execute instructions or programs to control various control valves in the breathing assist device, the air source interface 212 and / or the breathing circuit, or to process the received data to generate the required calculation or judgment results, or to generate visualization data or graphics and output the visualization data or graphics to the display 70 for display.

[0028] The above is a description of ventilation equipment, specifically a ventilator. It should be noted that... Figure 2 This is just one example of a ventilator, and it is not meant to limit ventilators to having only this type of structure. Figure 2 In the example, the ventilation function module 1000 in the ventilation equipment can be the breathing interface 211, air source interface 212, breathing circuit, breathing assist device, processor 50, display 70, etc. mentioned above, and the power supply device 2000 provides power to the electrical devices therein.

[0029] In some embodiments, the ventilation device may also be an anesthesia machine, which is primarily used to provide anesthetic gas, deliver the anesthetic gas to the patient's respiratory system, and control the amount of anesthetic gas inhaled. Please refer to... Figure 3 The ventilation device in some embodiments may include a breathing interface 311, an air source interface 312, a breathing assist device 320, an anesthetic output device 330, a processor 50, a display 70, and a power supply device 2000.

[0030] The gas source interface 312 is used to connect to a gas source (not shown in the figure) to provide gas. This gas can typically be oxygen, nitrous oxide (laughing gas), or air. In some embodiments, the gas source can be a compressed gas cylinder or a central gas supply source, supplying gas to the anesthesia machine through the gas source interface 312. The supplied gas types include oxygen (O2), nitrous oxide (N2O), and air. In some embodiments, the gas source can be an external gas source; in some embodiments, a gas source can also be installed inside the ventilation equipment. The gas source interface 312 can include conventional components such as a pressure gauge, pressure regulator, flow meter, pressure reducing valve, and N2O-O2 proportional control protection device, used to control the flow rate of various gases (e.g., oxygen, nitrous oxide, and air). The gas input into the gas source interface 312 enters the breathing circuit and mixes with the existing gas in the breathing circuit to form a gas mixture.

[0031] The respiratory assist device 320 is used to power the patient's involuntary breathing and maintain airway patency. In some embodiments, the respiratory assist device 320 is connected to the gas source interface 312 and the breathing circuit, controlling the delivery of gas supplied by an external gas source to the patient through the breathing circuit. In some specific embodiments, the respiratory assist device 320 mixes fresh gas input from the gas source interface 312 with gas exhaled by the patient in the breathing circuit and anesthetic drugs output from the anesthetic drug output device 330, and outputs the mixture through the inspiratory branch 340b to the breathing interface 311 to drive the patient's inhalation, and receives the patient's exhaled gas through the expiratory branch 340a. In specific embodiments, the respiratory assist device 320 typically includes a mechanical ventilation module, the airflow channel of which is connected to the breathing circuit. During the anesthesia maintenance phase of the operation or when the patient has not resumed spontaneous breathing, the mechanical ventilation module provides the patient with the power for breathing. In some embodiments, the respiratory assist device 320 also includes a manual ventilation module, the airflow channel of which is connected to the breathing circuit. During the induction phase before intubation in surgery, a manual ventilation module is typically used to assist the patient's breathing. When the respiratory assist device 320 includes both a mechanical ventilation module and a manual ventilation module, the mechanical or manual ventilation mode can be switched via a mechanical or manual switch (e.g., a three-way valve) to connect the mechanical or manual ventilation module to the breathing circuit, thereby controlling the patient's breathing. Those skilled in the art should understand that, depending on specific needs, the anesthesia machine may include only a mechanical ventilation module or a manual ventilation module.

[0032] The anesthetic delivery device 330 is used to provide anesthetic drugs. Typically, the anesthetic drug is mixed in gaseous form with fresh air introduced through the gas source interface 312 and delivered together into the breathing circuit. In one specific embodiment, the anesthetic delivery device 330 is implemented using an anesthetic vaporizer. The anesthetic drug is typically in liquid form and stored in the vaporizer. Optionally, the vaporizer may include a heating device for heating the anesthetic drug to volatilize it, generating anesthetic vapor. The anesthetic delivery device 330 is connected to the gas source interface 312 via a conduit. The anesthetic vapor mixes with the fresh air introduced through the gas source interface 312 and is then delivered together into the breathing circuit.

[0033] In some embodiments, the breathing circuit may include an inspiratory branch 340b, an expiratory branch 340a, and a soda lime canister 340c. The inspiratory branch 340b and expiratory branch 340a are connected to form a closed loop, and the soda lime canister 340c is disposed on the tubing of the expiratory branch 340a. A mixture of fresh air and gas introduced by the air supply interface 312 is input through the inlet of the inspiratory branch 340b and provided to the patient through a breathing interface 311 located at the outlet of the inspiratory branch 340b. The breathing interface 311 may be a face mask, a nasal cannula, or an endotracheal tube. In a preferred embodiment, a one-way valve is provided on the inspiratory branch 340b, which opens during the inspiratory phase and closes during the expiratory phase. A one-way valve is also provided on the expiratory branch 340a, which closes during the inspiratory phase and opens during the expiratory phase. The inlet of the expiratory branch 340a is connected to the breathing interface 311. When the patient exhales, the exhaled gas enters the soda lime container 340c through the expiratory branch 340a. The carbon dioxide in the exhaled gas is filtered out by the substance in the soda lime container 340c. The gas after the carbon dioxide is filtered out is then recirculated into the inspiratory branch 340b.

[0034] The processor 50 is used to execute instructions or programs to control the breathing assist device 320, the air source interface 310 and / or various control valves in the breathing circuit, or to process the received data to generate the required calculation or judgment results, or to generate visual data or graphics and output the visual data or graphics to the display 70 for display.

[0035] The above is a description of ventilation equipment as an anesthesia machine. It should be noted that... Figure 3 This is just one example of an anesthesia machine, and it is not intended to limit anesthesia machines to having only this structure. Figure 3 In the example, the ventilation function module 1000 in the ventilation equipment can be the breathing interface 311, air source interface 312, breathing assist device 320, anesthetic output device 330, processor 50, display 70, etc. mentioned above, and the power supply device 2000 supplies power to the electrical devices therein.

[0036] The above is a description of the ventilation function module 1000 in conjunction with the specific functions implemented by the ventilation equipment. The power supply device 2000 will be described below.

[0037] Please refer to Figure 4In some embodiments, the power supply device 2000 includes an AC-DC module 2100 and at least one charging circuit 2200, which may include one or more charging circuits 2200. The AC-DC module 2100 converts the input AC power into DC power to supply power to the charging circuit 2200 and various electrical devices. The charging circuit 2200 is connected to the rechargeable battery 2210 to charge the rechargeable battery 2210, which in turn supplies power to the various electrical devices. As can be seen, the AC-DC module 2100 receives AC power (e.g., mains power) and converts it into DC power, which is then divided into two parts for power supply. One part supplies power to the charging circuit 2200 to charge the rechargeable battery 2210, which in turn provides backup power to the various electrical devices in the ventilation equipment. The DC power converted by the AC-DC module 2100 is used to charge the rechargeable battery 2210 and to supply power to the various electrical devices in the ventilation equipment.

[0038] In some embodiments, when the input of the AC-to-DC module 2100 is normal, power is supplied through the AC-to-DC module 2100; when the input of the AC-to-DC module 2100 is abnormal, power is supplied through the rechargeable battery 2210. In some embodiments, when multiple rechargeable batteries 2210 are available, power is supplied preferentially through the rechargeable battery 2210 with the higher voltage.

[0039] In some embodiments, the rechargeable battery 2210 may be a lithium battery, such as a 4-in-2-in-1 lithium battery.

[0040] In some embodiments, dynamic power allocation is considered. When the actual system power reaches the rated maximum output power of the AC-DC module 2100, the charging circuit 2200 reduces or lowers the charging power to the rechargeable battery 2210, prioritizing the power supply to the electrical devices involved in the ventilation module 1000. After the actual system power decreases, the charging power can be restored, making full use of the remaining system power to supply power to the rechargeable battery 2210. Since the peak power of electrical devices involved in the ventilation module 1000, such as the turbine of an electric ventilator, is an order of magnitude larger than the average power, and the system needs to reserve some power for other loads with peak power, selecting a larger power AC-DC module according to existing technology principles would occupy more space, increase costs, and prevent the system from fully utilizing the power of the AC-DC module. Therefore, introducing dynamic power allocation can solve this problem.

[0041] Therefore, in some embodiments, the charging circuit 2200 also acquires the total power output of the AC-to-DC module 2100 and adjusts the charging power of the rechargeable battery 2210 based on the total power output of the AC-to-DC module 2100. For example, when the total power output of the AC-to-DC module 2100 reaches the maximum output power of the AC-to-DC module 2100, the charging circuit 2200 reduces the charging power of the rechargeable battery 2210, thereby increasing the power supply allocated to the electrical devices involved in the ventilation function module 1000.

[0042] In some embodiments, the charging circuit 2200 can obtain its total output power by sampling the output current of the AC-to-DC module 2100. Therefore, please refer to... Figure 5 In some embodiments, the ventilation device or power supply device 2000 further includes a first current sampling circuit 2110. The first current sampling circuit 2110 samples the output current of the AC-to-DC module 2100 and sends the sampled signal to the charging circuit 2200. The charging circuit 2200 calculates the total output power of the AC-to-DC module 2100 based on this signal, for example, using the formula that power equals the product of voltage and current. The first current sampling circuit 2110 can be implemented in various ways. For example, it can be implemented by connecting a sampling resistor to the output terminal of the AC-to-DC module 2100, or by connecting a sampling resistor in series in the output bus of the AC-to-DC module 2100. Current sampling is performed by obtaining the voltage across this sampling resistor. Understandably, the output bus of the AC-to-DC module 2100 refers to the route through which the AC-to-DC module 2100 is connected to the charging circuit 2200 and each electrical device. Figure 4 and Figure 5 This can also be clearly understood.

[0043] To increase the range of the backup battery, a multi-channel charging circuit 2200, such as two channels, can be introduced. This way, compared to a single backup battery, each battery in the multi-channel backup battery doesn't need to be very large. With a multi-channel charging circuit 2200, since these circuits average the power of the AC-to-DC module 2100, the balance of the current across these multiple channels needs to be considered. In some embodiments, multiple sampling resistors can be connected in series, sampling the voltage of one of the resistors and sending it to the charging circuit 2200. This reduces the difference in on-resistance and improves the balance of the multiple current-limiting channels. Please refer to... Figure 6 and Figure 7The charging circuit 2200 can be two-way, and each charging circuit 2200 has a corresponding first current sampling circuit 2110. The first current sampling circuits 2110 are connected in parallel to form a parallel circuit, which is connected in series to the output bus of the AC to DC module 2100. The first current sampling circuit 2110 includes a series resistor R1 and a resistor R2. The first current sampling circuit 2110 sends the voltage across one of the resistors R1 and R2 as the signal to the corresponding charging circuit 2200.

[0044] The above are some examples of prioritizing power supply to the electrical devices involved in the ventilation module 1000 through dynamic power allocation. In some embodiments, when supplying power to the electrical devices involved in the ventilation module 1000 (powered by the AC-to-DC module 2100 or the rechargeable battery 2210), priority can be given to ensuring the power supply capacity of devices that must be rated for power supply. Please refer to... Figure 8 In some embodiments, the power supply device 2000 further includes a first DC-DC converter 2310 (DC-DC1 module) and at least one second DC-DC converter 2320 (DC-DC2 module). The second DC-DC converter 2320 is used to obtain power from the DC power output from the AC-DC converter 2100 or the rechargeable battery 2210, and to power the devices that must be rated for power supply; for example, the second DC-DC converter 2320 may include two 5V DC-DC modules and one 12V DC-DC module. The first DC-DC converter 2310 is used to obtain power from the DC power output from the AC-DC converter 2100 or the rechargeable battery 2210, and to power the pressure generating device; for example, the first DC-DC converter 2310 may include a 26V DC-DC module. The first DC-DC converter 2310 also obtains the total power supplied by each electrical device and adjusts the power supply power of the pressure generating device based on the total power supplied by each electrical device, for example, prioritizing the power supply power of the devices that must be rated for power supply, specifically, it may be positively correlated with the total power.

[0045] Please refer to Figure 9 In some embodiments, the ventilation device or power supply device 2000 further includes a second current sampling circuit 2330. The second current sampling circuit 2330 is used to sample the total current supplying power to each electrical device and send the sampled signal to a first DC-to-DC module 2310. The first DC-to-DC module 2310 calculates the total power supply to each electrical device based on the signal, or directly adjusts the power supply of the pressure generating device based on the signal. For example, the larger the signal, the larger the power supply of the pressure generating device, and vice versa.

[0046] To ensure a more precise and prioritized supply of power to the necessary rated power devices, please refer to... Figure 10In some embodiments, the second current sampling circuit 2330 may be designed as follows: The second current sampling circuit 2330 includes resistors R1, R2, R3, R4, and R5. One end of resistor R2 is connected to the power supply line (or output terminal of AC-to-DC module 2100) that supplies power to each electrical device, and to one end of resistor R1. The other end of resistor R2 is connected to one end of resistor R3, the other end of resistor R3 is connected to one end of resistor R5, and the other end of resistor R5 is connected to one end of resistor R4. The other end of resistor R2 is also connected to the power supply line (or output terminal of rechargeable battery 2210) that supplies power to each electrical device. The other end of resistor R1 is connected to the main power supply line that supplies power to each electrical device (or the input terminal of the first DC-to-DC module 2310 and the input terminals of each second DC-to-DC module 2320). The end of resistor R4 not connected to resistor R5 is connected to the end of resistor R1 not connected to resistor R2. The voltage across resistor R5 is sent to the first DC-to-DC module 2310 as a signal obtained by the second current sampling circuit 2330. By using power sampling resistor grading or controller average current sampling threshold grading, the current limit values ​​are often proportional, making it difficult to set an ideal current limit value. Figure 10 The resistors R3, R4, and R5 of the second current sampling circuit 2330 shown form a voltage divider network, which amplifies the sampled value proportionally as needed to achieve the ideal limit setting value.

[0047] In some embodiments, the first DC-to-DC module 2310 adjusts the power supply of the pressure generating device according to a preset relationship between the signal sampled by the second current sampling circuit 2330 (e.g., the voltage across resistor R5) and the power supply of the pressure generating device, wherein the preset relationship is a positive correlation.

[0048] In some embodiments, a switch can be added between the output terminal of the rechargeable battery 2210 and the power-consuming device (or DC-DC module). When the AC power is off and the device is not in use, the switch is turned off, disconnecting the battery from the circuit and achieving a zero-power battery state. This prevents over-discharge of the battery during long-term storage or transportation. Therefore, please refer to... Figure 11 In some embodiments, a switch circuit 2220 is connected in series on the power supply line that supplies power to each electrical device by the rechargeable battery. When the ventilation equipment is turned off, the switch circuit 2220 is in the off state. In some embodiments, the switch circuit 2220 includes a P-type MOS transistor.

[0049] Let's take another example to illustrate this.

[0050] Figure 12A practical example could be a circuit block diagram of the power supply unit 2000 in an electronically controlled ventilator; wherein the first DC-DC module 2310 is a DC-DC module with an output voltage of 26V, which is used to power pressure generating devices such as turbine motors; the second DC-DC module 2320 includes two DC-DC modules with an output voltage of 5V and one DC-DC module with an output voltage of 12V. Figure 13 for Figure 12 A specific implementation circuit diagram of the first current sampling circuit 2110 in the circuit. Figure 14 for Figure 12 A specific implementation circuit diagram of the second current sampling circuit 2330. Figure 15 for Figure 12 Another specific implementation circuit diagram of the second current sampling circuit 2330 is shown below. Figures 12 to 15 The circuit diagram shown is used for illustration.

[0051] The peak power of the turbine in an electric ventilator is an order of magnitude higher than its average power. Simultaneously, some power needs to be reserved for other loads with peak power. Current technology would require a higher-power AC-DC converter, which occupies more space, increases cost, and prevents the system from fully utilizing the AC-DC power. Therefore, in some embodiments, a dynamic power allocation function is designed into the charging circuit. The first current sampling circuit 2110 samples the input current signal of AC_IN and sends it to the charging circuit 2200, setting the power limit to the maximum output power of the AC-DC module. When the system peak power reaches the limit, the charging circuit 2200 begins to reduce the charging power, prioritizing power supply to the system. Charging power is only provided after the system power decreases, fully utilizing the remaining system power to power the battery. Because... Figure 12 The two charging circuits in the middle limit the input power of the AC-DC module on average, and the current balance between the two circuits needs to be considered. This design adopts the following... Figure 13 The two sampling resistors shown are connected in series. Sampling the voltage across one of the resistors reduces the difference in on-resistance and improves performance. Figure 12 Balance the current limiting in the two circuits.

[0052] The DC-DC module powering the turbine drive (i.e., the 26V DC-DC module in the diagram) is designed with an input power limiting function. Priority is given to supplying power to two 5V circuits (e.g., the ventilation protection circuit and control circuit) and one 12V circuit (e.g., the display components, main control circuit, and valves). This priority is implemented because insufficient power to these circuits will degrade their functionality or even prevent them from operating altogether. While insufficient power to the turbine, which requires 26V, will result in performance degradation, it will not affect functionality. After ensuring the power supply to the two 5V circuits and the one 12V circuit, the remaining power is supplied to the turbine drive, thus maximizing the utilization of the power provided by the AC-DC module 2100 and the rechargeable battery 2210. The input power limiting function is implemented through… Figure 14 The current sensing resistor R1 samples the input current signal from the AC-DC module 2100 or the rechargeable battery 2210 and feeds it to the 26V DC-DC module to limit power. The power limitation is proportional to the input voltage. Sometimes, the voltage difference ratio does not reach the target power limitation value for the AC-DC module 2100 and the rechargeable battery 2210, requiring further design refinement. Figure 15 The circuit shown uses R1 and R2 in series for sampling BAT_IN and R2 for sampling AC-IN. By changing the values ​​of these two sampling resistors, the power limit can be flexibly adjusted. However, by using different power sampling resistor levels or the controller's average current sampling threshold levels, the current limit values ​​are often proportional, making it difficult to set an ideal current limit value. Figure 15 The resistors R3, R4, and R5 in the circuit shown form a voltage divider network, which amplifies the sampled value proportionally as needed to achieve the ideal limit setting value.

[0053] In some embodiments, a PMOS switch is added between the output terminal of the rechargeable battery 2210 and the power circuit. When the AC is not in the power-off state, the PMOS is turned off, the connection between the battery and the circuit is cut off, and the battery achieves a zero power consumption state, thus avoiding over-discharge of the battery during long-term storage and transportation of the machine.

[0054] In existing technologies, primary / standby power switching is achieved through power diodes or hard switches, resulting in high losses and voltage stress. In some embodiments of this invention, the primary / standby switching circuit is implemented as follows: the primary / standby switching circuit is divided into two paths: one path provides power to a low-current standby power supply circuit (e.g., ...). Figure 12The power management circuit (M0) switches the AC_IN and two rechargeable battery output voltages via ordinary Schottky diodes, then outputs a step-down standby power supply 3V3_STB, primarily powering the MCU and some control circuits. These circuits manage switching circuits, DC-DC module power-on and power-off timing, etc. The other circuit is the main power circuit (i.e., one 26V, one 12V, and two 5V outputs in the diagram). It first switches the two rechargeable battery output voltages and AC_IN via ideal diodes with very small voltage drops, then outputs the bus voltage VBUS to power the subsequent high-current load. When AC_IN is in position, the voltage is higher than the battery voltage, and AC_IN supplies power. When AC_IN is not in position, the battery with the higher voltage discharges first.

[0055] This document describes various exemplary embodiments with reference to them. However, those skilled in the art will recognize that changes and modifications can be made to the exemplary embodiments without departing from the scope of this document. For example, various operational steps and components for performing operational steps can be implemented in different ways depending on the specific application or considering any number of cost functions associated with the operation of the system (e.g., one or more steps can be deleted, modified, or combined with other steps).

[0056] While the principles herein have been illustrated in various embodiments, numerous modifications to the structure, arrangement, proportions, elements, materials, and components, particularly suited to specific environmental and operational requirements, may be used without departing from the principles and scope of this disclosure. These modifications and other alterations or alterations will be included within the scope of this document.

[0057] The foregoing specific descriptions have been described with reference to various embodiments. However, those skilled in the art will recognize that various modifications and changes can be made without departing from the scope of this disclosure. Therefore, considerations for this disclosure are to be illustrative rather than restrictive, and all such modifications are to be included within its scope. Similarly, advantages, other advantages, and solutions to problems with respect to various embodiments have been described above. However, benefits, advantages, solutions to problems, and any elements that produce these, or make them more explicit, should not be construed as critical, essential, or necessary. The term “comprising” and any other variations thereof as used herein are non-exclusive inclusion, meaning that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not expressly listed or not part of the process, method, system, article, or apparatus. Furthermore, the term “coupled” and any other variations thereof as used herein refer to physical connections, electrical connections, magnetic connections, optical connections, communication connections, functional connections, and / or any other connections.

[0058] Those skilled in the art will recognize that many changes can be made to the details of the above embodiments without departing from the basic principles of the invention. Therefore, the scope of the invention should be determined only by the claims.

Claims

1. A ventilation device, characterized in that, include: At least one ventilation function module, each ventilation function module is used to perform at least one function required for the ventilation equipment to perform mechanical ventilation; the at least one ventilation function module includes one or more electrical devices, the one or more electrical devices include a pressure generating device and one or more rated power supply devices; The power supply device includes an AC-to-DC module and at least one charging circuit; The AC-to-DC module is used to convert the input AC power into DC power to supply power to the charging circuit and various electrical devices; the charging circuit is used to connect to the rechargeable battery to charge the rechargeable battery, which can supply power to various electrical devices; the charging circuit also obtains the total power output of the AC-to-DC module and adjusts the charging power of the rechargeable battery based on the total power output of the AC-to-DC module. The power supply device further includes a first DC-to-DC module and at least one second DC-to-DC module; the second DC-to-DC module is used to obtain power from the DC power output by the AC-to-DC module or the rechargeable battery, and to supply power to the required rated power supply device; the first DC-to-DC module is used to obtain power from the DC power output by the AC-to-DC module or the rechargeable battery, and to supply power to the pressure generating device; the first DC-to-DC module also obtains the total power supplied by each electrical device, and adjusts the power supply power of the pressure generating device based on the total power supplied by each electrical device.

2. The ventilation device as described in claim 1, characterized in that, When the total output power of the AC-to-DC module reaches the maximum output power of the AC-to-DC module, the charging circuit reduces the charging power of the rechargeable battery.

3. The ventilation device as described in claim 1 or 2, characterized in that, It also includes a first current sampling circuit, which is used to sample the output current of the AC-to-DC module and send the sampled signal to the charging circuit, and the charging circuit calculates the total output power of the AC-to-DC module based on the signal.

4. The ventilation device as described in claim 3, characterized in that, The charging circuit has two paths; each charging circuit corresponds to a first current sampling circuit; the first current sampling circuits are connected in parallel to form a parallel circuit, which is connected in series to the output bus of the AC to DC module; the first current sampling circuit includes: a resistor R1 and a resistor R2 connected in series; the first current sampling circuit sends the voltage across one of the resistors R1 and R2 as the signal to the corresponding charging circuit.

5. The ventilation device as described in claim 1, characterized in that, It also includes a second current sampling circuit, which is used to sample the total current supplying power to each electrical device and send the sampled signal to the first DC-to-DC module. The first DC-to-DC module calculates the total power supply to each electrical device based on the signal.

6. The ventilation device as described in claim 5, characterized in that, The second current sampling circuit includes resistors R1, R2, R3, R4, and R5; One end of resistor R2 is connected to the power supply line of the AC to DC module that supplies power to each electrical device, and is also connected to one end of resistor R1; the other end of resistor R2 is connected to one end of resistor R3, the other end of resistor R3 is connected to one end of resistor R5, and the other end of resistor R5 is connected to one end of resistor R4. The other end of resistor R2 is also connected to the power supply line that supplies power to each electrical device via the rechargeable battery; the other end of resistor R1 is connected to the main power supply line that supplies power to each electrical device. The end of resistor R4 that is not connected to resistor R5 is connected to the end of resistor R1 that is not connected to resistor R2; The voltage across resistor R5 is sent as the signal to the first DC-to-DC module.

7. The ventilation device as described in claim 5 or 6, characterized in that, The first DC-to-DC module adjusts the power supply of the pressure generating device based on the total power supplied by each electrical device, including: the first DC-to-DC module adjusts the power supply of the pressure generating device according to a preset relationship between the signal and the power supply of the pressure generating device, wherein the preset relationship is a positive correlation.

8. The ventilation device as described in claim 1, characterized in that, A switching circuit is connected in series on the power supply line that supplies power to each electrical device via the rechargeable battery. When the ventilation equipment is turned off, the switching circuit is in the off state.

9. The ventilation device as described in claim 8, characterized in that, The switching circuit includes a P-type MOS transistor.

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