A drive circuit for a breathing valve, a breathing machine

Abstract

The present application relates to the technical field of medical equipment, and more particularly to a driving circuit of a breathing valve and a breathing machine, the driving circuit of the breathing valve comprises a first processor, a valve control circuit and a valve monitoring circuit, a gate drive chip is arranged in the valve control circuit, the gate drive chip is low in cost, can quickly provide or absorb gate current, shortens the level conversion time, can greatly reduce the heating of the MOS tube, and the valve monitoring circuit is further arranged to monitor the signal of the negative pole of the voice coil motor in the breathing valve and input the monitoring signal to the first processor, the first processor adjusts the driving signal in time according to the monitoring signal, ensures the accuracy of the driving signal, can realize the accurate control of the first processor on the voice coil motor, and improves the force control accuracy of the voice coil motor. The driving circuit of the breathing valve meets the high-precision requirement of the voice coil motor, and reduces the cost of the breathing machine.

Description

Technical Field

[0001] This invention relates to the field of medical device technology, and in particular to a driving circuit for a breathing valve and a ventilator. Background Technology

[0002] Ventilators are primarily used clinically to treat patients with respiratory failure. Precisely adjusting the end-expiratory pressure according to the patient's condition is crucial for treatment. This end-expiratory pressure is controlled by the force applied to the respiratory diaphragm by a voice coil motor. Current technologies employ two methods: DAC (Digital-to-Analog Converter) control with a constant current source and pulse width modulation (PWM) drive. DAC control with a constant current source is simple but consumes a lot of energy, leading to overheating of the MOSFET. PWM drive consumes less energy and reduces MOSFET overheating, but its lower force control precision results in poor dynamic performance of the voice coil motor, failing to meet the force control requirements of ventilators. Using high-slew rate, high-bandwidth comparators to meet these requirements would increase the cost of the ventilator, contributing to the high cost of ventilator equipment. Summary of the Invention

[0003] This invention provides a driving circuit for a breathing valve and a ventilator to solve the problem of high ventilator cost caused by using PWM driving in traditional driving methods to reduce MOSFET heating.

[0004] In a first aspect, the present invention provides a driving circuit for a breathing valve, comprising: a first processor, a valve control circuit, and a valve monitoring circuit;

[0005] The valve monitoring circuit has its input terminal connected to the negative terminal of the voice coil motor in the breathing valve, and its output terminal connected to the input terminal of the first processor. The valve monitoring circuit is used to monitor the signal of the negative terminal of the voice coil motor in the breathing valve and input the monitoring signal to the first processor.

[0006] The valve control circuit includes a gate driver chip and a first switching transistor. The input terminal of the gate driver chip is connected to the first output terminal of the first processor, the output terminal of the gate driver chip is connected to the control terminal of the first switching transistor, the power supply terminal of the gate driver chip is connected to a first power supply, and the ground terminal of the gate driver chip is grounded. The input terminal of the first switching transistor is connected to the negative terminal of the voice coil motor in the breathing valve, and the output terminal of the first switching transistor is grounded. The first processor is used to output a drive signal to the gate driver chip and adjust the drive signal according to the monitoring signal. The gate driver chip is used to drive the first switching transistor according to the drive signal output by the first processor to control the voice coil motor in the breathing valve to turn on and off.

[0007] In one embodiment, the valve control circuit further includes a first resistor, a second resistor, a third resistor, a first capacitor, and a second capacitor. One end of the first resistor is connected to the control terminal of the first switching transistor, and the other end of the first resistor is connected to the output terminal of the gate driver chip. One end of the second resistor is connected to the first output terminal of the first processor, and the other end of the second resistor is connected to the input terminal of the gate driver chip. One end of the third resistor is connected to the input terminal of the gate driver chip, and the other end of the third resistor is grounded. One end of the first capacitor is connected to the power supply terminal of the gate driver chip, and the other end of the first capacitor is grounded. The second capacitor is connected in parallel with the first capacitor.

[0008] In one embodiment, the valve monitoring circuit includes: a current amplifier and a monitoring resistor. The negative input terminal of the current amplifier is connected to the input terminal of the first switching transistor, the positive input terminal of the current amplifier is connected to the negative terminal of the voice coil motor in the breather valve, the power supply terminal of the current amplifier is connected to a second power supply, the output terminal of the current amplifier is connected to the input terminal of the first processor, and the ground terminal of the current amplifier is grounded. One end of the monitoring resistor is connected to the positive input terminal of the current amplifier, and the other end of the monitoring resistor is connected to the negative input terminal of the current amplifier. The current amplifier is used to collect the current output from the negative terminal of the voice coil motor of the breather valve to both ends of the monitoring resistor.

[0009] In one embodiment, the valve monitoring circuit further includes: a dual series-connected switching diode, wherein the cathode of the dual series-connected switching diode is connected to a second power supply, the anode of the dual series-connected switching diode is grounded, and the center point of the upper and lower tubes of the dual series-connected switching diode is connected to the output terminal of the current amplifier.

[0010] In one embodiment, the valve monitoring circuit further includes: a fourth resistor, a third capacitor, and a fourth capacitor. One end of the fourth resistor is connected to the output terminal of the current amplifier, and the other end of the fourth resistor is connected to the center point of the upper and lower transistors of the dual series-connected switching diode. One end of the third capacitor is connected to the power supply terminal of the current amplifier, and the other end of the third capacitor is grounded. One end of the fourth capacitor is connected to the other end of the fourth resistor, and the other end of the fourth capacitor is grounded.

[0011] In one embodiment, the driving circuit of the breathing valve further includes: a second processor and a power supply circuit;

[0012] The input terminal of the power supply circuit is connected to a third power source, and the output terminal of the power supply circuit is connected to the positive terminal of the voice coil motor in the breathing valve. The power supply circuit is used to provide a power supply signal to the positive terminal of the voice coil motor in the breathing valve.

[0013] The output terminal of the second processor is connected to the control terminal of the power supply circuit, and the input terminal of the second processor is connected to the second output terminal of the first processor. The second processor is used to control the power supply signal output by the power supply circuit according to the processor fault signal output by the first processor.

[0014] In one embodiment, the power supply circuit includes a second switch, a third switch, a fourth switch, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, and a tenth resistor. The input terminal of the second switch is connected to a third power supply, the output terminal of the second switch is connected to the positive terminal of the voice coil motor in the breathing valve, and the control terminal of the second switch is connected to one end of the eighth resistor.

[0015] The input terminal of the third switch is connected to the other end of the eighth resistor, the output terminal of the third switch is grounded, the control terminal of the third switch is connected to one end of the ninth resistor, the input terminal of the fourth switch is connected to the other end of the ninth resistor, the output terminal of the fourth switch is grounded, the control terminal of the fourth switch is connected to one end of the tenth resistor, and the other end of the tenth resistor is connected to the output terminal of the second processor.

[0016] One end of the fifth resistor is connected to the control terminal of the fourth switching transistor, and the other end of the fifth resistor is grounded. One end of the sixth resistor is connected to the third power supply, and the other end of the sixth resistor is connected to the input terminal of the fourth switching transistor. One end of the seventh resistor is connected to the third power supply, and the other end of the seventh resistor is connected to the input terminal of the third switching transistor.

[0017] In one embodiment, the driving circuit of the breathing valve further includes a filter protection circuit, the input terminal of which is connected to the output terminal of the power supply circuit, the first output terminal of which is connected to the input terminal of the first switching transistor, and the second output terminal of which is connected to the positive terminal of the voice coil motor in the breathing valve.

[0018] In one embodiment, the filtering protection circuit includes: a first filtering capacitor, a second filtering capacitor, a third filtering capacitor, and a first diode. One end of the first filtering capacitor is connected to the output terminal of the power supply circuit, and the other end of the first filtering capacitor is grounded. One end of the second filtering capacitor is connected to the output terminal of the power supply circuit, and the other end of the second filtering capacitor is connected to the input terminal of the first switching transistor. One end of the third filtering capacitor is connected to the output terminal of the power supply circuit, and the other end of the third filtering capacitor is grounded. The anode of the first diode is connected to the input terminal of the first switching transistor, and the cathode of the first diode is connected to the output terminal of the power supply circuit.

[0019] In a second aspect, the present invention provides a ventilator, the ventilator comprising a driving circuit for a breathing valve as described in the first aspect and its improvements, a voice coil motor, and a breathing diaphragm, wherein the driving circuit controls the force applied by the voice coil motor to the breathing diaphragm by controlling the on and off states of the voice coil motor.

[0020] The beneficial effects of the embodiments of the present invention compared with the prior art are as follows:

[0021] The breathing valve drive circuit of this invention includes: a first processor, a valve control circuit, and a valve monitoring circuit. A gate driver chip is incorporated into the valve control circuit. This gate driver chip is inexpensive and can quickly provide or absorb gate current, shortening the level transition time and significantly reducing MOSFET heating. Simultaneously, the valve monitoring circuit monitors the signal at the negative terminal of the voice coil motor in the breathing valve and inputs the monitoring signal to the first processor. The first processor adjusts the drive signal promptly based on the monitoring signal, ensuring the accuracy of the drive signal and enabling precise control of the voice coil motor by the first processor, thus improving the force control accuracy of the voice coil motor. This breathing valve drive circuit of the present invention meets the high precision requirements of the voice coil motor while reducing the cost of the ventilator equipment. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the module structure of the control circuit of the breathing valve provided in an embodiment of the present invention;

[0024] Figure 2 This is a circuit connection diagram of a valve control circuit provided in an embodiment of the present invention;

[0025] Figure 3 This is a circuit connection diagram of a valve monitoring circuit provided in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of the module structure of the control circuit of the breathing valve provided in an embodiment of the present invention;

[0027] Figure 5 This is a circuit connection diagram of a power supply circuit provided in an embodiment of the present invention;

[0028] Figure 6 This is a schematic diagram of the module structure of the control circuit of the breathing valve provided in an embodiment of the present invention;

[0029] Figure 7 This is a circuit connection diagram of a filter protection circuit provided in an embodiment of the present invention;

[0030] Figure 8 This is a schematic diagram of the module structure of the control circuit of the breathing valve provided in an embodiment of the present invention;

[0031] Among them, 1 is the first processor, 2 is the valve control circuit, 3 is the valve monitoring circuit, 4 is the second processor, 5 is the power supply circuit, 6 is the filter protection circuit, 21 is the gate driver chip, and 22 is the first switching transistor. Detailed Implementation

[0032] To make the technical problems solved, the technical solutions, and the beneficial effects of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0033] In the description of this invention, it should be understood that the terms "longitudinal," "radial," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] To fully understand this invention, detailed structures and steps will be presented in the following description to illustrate the technical solution proposed by this invention. Preferred embodiments of the invention are described in detail below; however, in addition to these detailed descriptions, the invention may have other embodiments.

[0036] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure pertains. It will be further understood that the terms used herein should be interpreted as having the same meaning as they mean in the context of this specification and related art, and will not be interpreted in an idealized or overly formal sense unless expressly defined herein.

[0037] In one embodiment, such as Figure 1 The diagram shows a modular structure of a driving circuit for a breathing valve, including: a first processor 1, a valve control circuit 2, and a valve monitoring circuit 3.

[0038] The valve monitoring circuit 3 has its input terminal connected to the negative terminal of the voice coil motor in the breathing valve, and its output terminal connected to the input terminal of the first processor 1. The valve monitoring circuit 3 is used to monitor the signal of the negative terminal of the voice coil motor in the breathing valve and input the monitoring signal VCM State to the first processor 1.

[0039] The valve control circuit 2 includes a gate driver chip 21 and a first switching transistor 22. The input terminal of the gate driver chip 21 is connected to the first output terminal of the first processor 1, the output terminal of the gate driver chip 21 is connected to the control terminal of the first switching transistor 22, the power supply terminal of the gate driver chip 21 is connected to the first power supply +VP, and the ground terminal of the gate driver chip 21 is grounded. The input terminal of the first switching transistor 22 is connected to the negative terminal of the voice coil motor in the breathing valve, and the output terminal of the first switching transistor 22 is grounded. The first processor 1 is used to output a drive signal VCM_Ctrl to the gate driver chip 21 and adjust the drive signal VCM_Ctrl according to the monitoring signal VCM State. The gate driver chip 21 is used to drive the first switching transistor 22 according to the drive signal VCM_Ctrl output by the first processor 1 to control the voice coil motor in the breathing valve to turn on and off.

[0040] The working process of the above-mentioned breathing valve drive circuit is as follows: the power supply signal is input to the positive terminal of the voice coil motor in the breathing valve, flows to the valve monitoring circuit 3 through the negative terminal of the voice coil motor, the valve monitoring circuit 3 monitors the signal at the negative terminal of the voice coil motor in real time, and outputs the monitoring signal VCM_StateVCM to the first processor 1. State, understandably, the valve monitoring circuit 3 can monitor the voltage of the voice coil motor, the current of the voice coil motor, or both the voltage and current of the voice coil motor simultaneously; the first processor 1 adjusts the drive signal VCM_Ctrl according to the monitoring signal VCM_State, and then outputs the drive signal VCM_Ctrl to the gate drive chip 21. The drive signal VCM_Ctrl is a PWM signal with a fixed frequency and adjustable duty cycle. The gate drive chip 21 controls the conduction and turn-off of the first switch 22 according to the drive signal VCM_Ctrl. When the first switch 22 is on, the negative terminal of the voice coil motor is grounded, and the positive and negative terminals of the voice coil motor form a circuit, and current flows in the voice coil motor. According to the magnitude of the current, a corresponding force is applied to the breathing diaphragm in the breathing valve; when the first switch 22 is off, the positive and negative terminals of the voice coil motor cannot form a complete circuit. At this time, the voice coil motor does not work. The current of the voice coil motor is controlled by adjusting the duty cycle of the PWM signal, thereby controlling the force applied by the voice coil motor to the breathing diaphragm, and thus controlling the breathing flow rate and positive end-breathing pressure in the breathing valve.

[0041] The breathing valve drive circuit of this embodiment includes: a first processor 1, a valve control circuit 2, and a valve monitoring circuit 3. A gate driver chip 21 is incorporated into the valve control circuit 2. This gate driver chip 21 is inexpensive, can quickly provide or absorb gate current, shortens level transition time, and significantly reduces MOSFET heating. Simultaneously, the valve monitoring circuit 3 monitors the signal at the negative terminal of the voice coil motor in the breathing valve and inputs a monitoring signal VCM_State to the first processor 1. The first processor 1 adjusts the drive signal VCM_Ctrl in a timely manner based on the monitoring signal VCM_State, ensuring the accuracy of the drive signal VCM_Ctrl. This enables precise control of the voice coil motor by the first processor 1, improving the force control accuracy of the voice coil motor. The breathing valve drive circuit of this invention meets the high precision requirements of the voice coil motor while reducing the cost of the ventilator equipment.

[0042] In one embodiment, such as Figure 2 As shown, a circuit connection diagram of a valve control circuit is provided. Figure 1Based on the driving circuit of the breathing valve shown, the valve control circuit 2 also includes a first resistor R3, a second resistor R4, a third resistor R5, a first capacitor C6, and a second capacitor C7. One end of the first resistor R3 is connected to the control terminal of the first switching transistor 22, and the other end of the first resistor R3 is connected to the output terminal of the gate driver chip 21. One end of the second resistor R4 is connected to the first output terminal of the first processor 1, and the other end of the second resistor R4 is connected to the input terminal of the gate driver chip 21. One end of the third resistor R5 is connected to the input terminal of the gate driver chip 21, and the other end of the third resistor R5 is grounded. One end of the first capacitor C6 is connected to the power supply terminal of the gate driver chip 21, and the other end of the first capacitor C6 is grounded. The second capacitor C7 is connected in parallel with the first capacitor.

[0043] The working process of the above-mentioned breathing valve drive circuit is as follows: the drive signal VCM_Ctrl output by the first processor is divided by the second resistor R4 and the third resistor R5, and then flows to the gate drive chip 21. The signal output by the gate drive chip 21 flows to the first switch 22 after passing through the first resistor R3. The signal of the first power supply +VP flows into the gate drive chip 21 after being filtered by the first capacitor C6 and the second capacitor C7.

[0044] In the driving circuit of the breathing valve in this embodiment, the second resistor R4 and the third resistor R5 are voltage divider resistors. By setting the voltage divider resistors, the voltage is divided to prevent the gate driver chip 21 from being damaged by excessive voltage. The first resistor R3 is a current limiting resistor. By setting the current limiting resistor, the current flowing to the first switching transistor 22 is reduced to prevent the first switching transistor 22 from being damaged. By setting a filter capacitor between the first power supply +VP and ground, the signal output by the first power supply +VP can be stabilized, which plays a role in anti-interference.

[0045] In one embodiment, such as Figure 3 As shown, a circuit connection diagram of a valve monitoring circuit is provided. Figure 1 Based on the driving circuit of the breathing valve shown, the valve monitoring circuit 3 includes: a current amplifier U1 and a monitoring resistor R1. The negative input terminal of the current amplifier U1 is connected to the input terminal of the first switching transistor 22, the positive input terminal of the current amplifier U1 is connected to the negative terminal of the voice coil motor in the breathing valve, the power supply terminal of the current amplifier U1 is connected to the second power supply +VA, the output terminal of the current amplifier U1 is connected to the input terminal of the first processor 1, the ground terminal of the current amplifier U1 is grounded, one end of the monitoring resistor R1 is connected to the positive input terminal of the current amplifier U1, and the other end of the monitoring resistor R1 is connected to the negative input terminal of the current amplifier U1. The current amplifier U1 is used to collect the current output from the negative terminal of the voice coil motor of the breathing valve to the two ends of the monitoring resistor R1.

[0046] The working process of the above-mentioned breathing valve drive circuit is as follows: the signal from the negative terminal of the voice coil motor flows to the first switching transistor 22 through the detection resistor R1, and the current is collected by the current amplifier U1. Optionally, the current amplifier can also directly collect the current flowing to the first switching transistor 22 and convert the collected current into a voltage signal. The voltage signal is amplified by a certain factor by the current amplifier U1 and then flows to the first processor 1. Preferably, a pressure sensor is set in the breathing valve to detect the force applied by the voice coil motor to the breathing diaphragm. The first processor 1 adjusts the drive signal VCM_Ctrl input to the gate drive chip 21 in a timely manner according to the data detected by the pressure sensor and the amplified voltage signal.

[0047] In this embodiment, the driving circuit of the breathing valve acquires the current signal of the negative terminal of the voice coil motor in real time by setting a current amplifier U1. The acquired current signal is converted into a voltage signal, and the current amplifier U1 then performs high-precision calculation and amplification on the voltage signal. The amplified signal is then input to the first processor 1. The first processor 1 adjusts the driving signal VCM_Ctrl in a timely manner according to the input signal, ensuring the accuracy of the driving signal VCM_Ctrl. This enables the first processor 1 to accurately control the voice coil motor and improves the force control accuracy of the voice coil motor.

[0048] In one embodiment, such as Figure 3 As shown, the valve monitoring circuit 3 also includes: a dual series switching diode D2, the cathode of the dual series switching diode D2 is connected to the second power supply +VA, the anode of the dual series switching diode D2 is grounded, and the center point of the upper and lower tubes of the dual series switching diode D2 is connected to the output terminal of the current amplifier U1.

[0049] The working process of the above-mentioned breathing valve drive circuit is as follows: the signal output by the current amplifier U1 passes through the dual series diode D2 and then flows to the first processor 1.

[0050] In this embodiment, the driving circuit of the breathing valve is provided with a dual series switching diode D2 at the input terminal of the first processor 1. The dual series switching diode D2 can withstand high power and provides good protection for the first processor 1, preventing damage to the first processor 1 from overvoltage, overcurrent and reverse current.

[0051] In one embodiment, such as Figure 3 As shown, the valve monitoring circuit 3 also includes: a fourth resistor R2, a third capacitor C4, and a fourth capacitor C5. One end of the fourth resistor R2 is connected to the output terminal of the current amplifier U1, and the other end of the fourth resistor R2 is connected to the center point of the upper and lower transistors of the dual series switching diode D2. One end of the third capacitor C4 is connected to the power supply terminal of the current amplifier U1, and the other end of the third capacitor C4 is grounded. One end of the fourth capacitor C5 is connected to the other end of the fourth resistor R2, and the other end of the fourth capacitor C5 is grounded.

[0052] The operation of the above-mentioned breathing valve drive circuit is as follows: The monitoring signal VCM_State output by the current amplifier U1 flows to the fourth capacitor C5 after passing through the fourth resistor R2. After being filtered by the fourth capacitor C5, it flows to the first processor 1 after passing through the dual series switching diode D2. The signal of the second power supply +VA flows to the current amplifier U1 after being filtered by the third capacitor C4.

[0053] In the driving circuit of the breathing valve in this embodiment, the fourth resistor R2 is a current-limiting resistor. By setting the current-limiting resistor, the current flowing to the first processor 1 is reduced, preventing the excessive current from damaging the first processor 1. By setting the fourth capacitor C5 for filtering, the signal can be made more stable. By setting a filter capacitor between the second power supply +VA and ground for filtering, the signal output by the second power supply +VA can be stabilized, playing an anti-interference role.

[0054] In one embodiment, such as Figure 4 As shown, a schematic diagram of a module structure for a breathing valve drive circuit is provided. Figure 1 Based on the driving circuit of the breathing valve shown, the driving circuit of the breathing valve also includes: a second processor 4 and a power supply circuit 5.

[0055] The input terminal of power supply circuit 5 is connected to the third power supply VP_VCM, and the output terminal of power supply circuit 5 is connected to the positive terminal of the voice coil motor in the breathing valve. Power supply circuit 5 is used to provide a power supply signal to the positive terminal of the voice coil motor in the breathing valve.

[0056] The output terminal of the second processor 4 is connected to the control terminal of the power supply circuit 5, and the input terminal of the second processor 4 is connected to the second output terminal of the first processor 1. The second processor 4 is used to control the power supply signal output by the power supply circuit 5 according to the processor fault signal output by the first processor 1.

[0057] It is understood that the power supply circuit in this embodiment may include a switching transistor, and the control signal output by the second processor controls the power supply circuit to turn off by controlling the switching transistor; the power supply circuit may also include a relay, and the control signal controls the power supply circuit to turn off by controlling the relay; the power supply circuit may also include a comparator, and the control signal controls the power supply circuit to turn off by controlling the comparator.

[0058] The working process of the above-mentioned breathing valve drive circuit is as follows: the signal output by the third power supply VP_VCM flows to the positive terminal of the voice coil motor through the power supply circuit 5 to supply power to the voice coil motor. The second processor 4 communicates with the first processor 1 in real time. When the communication is abnormal, the second processor 4 judges that the first processor 1 is faulty and outputs a control signal to shut off the power supply circuit 5. There is no signal input to the positive terminal of the voice coil motor, and the voice coil motor does not work.

[0059] In this embodiment, the driving circuit of the breathing valve supplies power to the voice coil motor by inputting a power supply signal to the positive terminal of the voice coil motor through the power supply circuit 5. A second processor 4 is provided. When the communication between the first processor 4 and the second processor 4 is abnormal, the second processor 4 controls the power supply circuit to shut off, stopping the power supply to the voice coil motor. The voice coil motor does not work, and the breathing valve is in the open state, ensuring the safety of the patient using the breathing valve.

[0060] In one embodiment, such as Figure 5 As shown, a circuit connection diagram of a power supply circuit is provided. Figure 4 Based on the driving circuit of the breathing valve shown, the power supply circuit 5 includes a second switch Q2, a third switch Q3, a fourth switch Q4, a fifth resistor R11, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a tenth resistor R10. The input terminal of the second switch Q2 is connected to the third power supply VP_VCM, the output terminal of the second switch Q2 is connected to the positive terminal of the voice coil motor in the breathing valve, and the control terminal of the second switch Q2 is connected to one end of the eighth resistor R8.

[0061] The input terminal of the third switch Q3 is connected to the other end of the eighth resistor R8, the output terminal of the third switch Q3 is grounded, the control terminal of the third switch Q3 is connected to one end of the ninth resistor R9, the input terminal of the fourth switch Q4 is connected to the other end of the ninth resistor R9, the output terminal of the fourth switch Q4 is grounded, the control terminal of the fourth switch Q4 is connected to one end of the tenth resistor R10, and the other end of the tenth resistor R10 is connected to the output terminal of the second processor 4.

[0062] One end of the fifth resistor R11 is connected to the control terminal of the fourth switch Q4, and the other end of the fifth resistor R11 is grounded. One end of the sixth resistor R6 is connected to the third power supply VP_VCM, and the other end of the sixth resistor R6 is connected to the input terminal of the fourth switch Q4. One end of the seventh resistor R7 is connected to the third power supply VP_VCM, and the other end of the seventh resistor R7 is connected to the input terminal of the third switch Q3.

[0063] The working process of the above-mentioned breathing valve drive circuit is as follows: In this embodiment, a switch tube is set to control the power supply circuit to turn off. When the second processor 4 communicates normally with the first processor 1, the fourth switch tube Q4 is in the off state. The signal output by the third power supply VP_VCM flows to the third switch tube Q3 through the sixth resistor R6 and the ninth circuit R9. The third switch tube Q3 is turned on. After the voltage of the third switch tube Q3 is turned on, it pulls down the voltage on the eighth resistor R8. The second switch tube Q2 is turned on. The signal output by the third power supply VP_VCM flows to the positive terminal of the voice coil motor through the second switch tube Q2.

[0064] When the communication between the second processor 4 and the first processor 1 is abnormal, the second processor 4 receives a processor fault signal sent by the first processor 1 and outputs a high-level signal VCM-PWR_OFF to the control terminal of the fourth switch Q4. The fourth switch Q4 turns on, pulls down the voltage at the control terminal of the third switch Q3, and the third switch Q3 turns off. After the third switch Q3 turns off, the voltage at the control terminal of the second switch Q2 increases, and the second switch Q2 turns off. The third power supply VP_VCM cannot send a signal to the positive terminal of the voice coil motor, and the voice coil motor does not work.

[0065] In this embodiment, the driving circuit of the breathing valve, by setting up a second processor 4 and communicating with the first processor 1 in real time, ensures that the first processor 1 works normally and can properly control the breathing valve, thus ensuring patient safety. When the communication between the first processor 1 and the second processor 4 is normal, the power supply circuit 5 provides a power signal to the positive terminal of the voice coil motor through a switching transistor. When the communication between the first processor 1 and the second processor 4 is abnormal, the second processor 4 controls the switching transistor to turn off, cutting off the output of the power supply circuit 5. The switching transistor can reduce the power consumption and heat loss of the circuit, improving the performance and reliability of the breathing valve.

[0066] In one embodiment, such as Figure 6 As shown, a schematic diagram of a module structure for a breathing valve drive circuit is provided. Figure 4 Based on the driving circuit of the breathing valve shown, the driving circuit of the breathing valve further includes: a filter protection circuit 6, the input terminal of the filter protection circuit 6 is connected to the output terminal of the power supply circuit 5, the first output terminal of the filter protection circuit 6 is connected to the input terminal of the first switching tube 22, and the second output terminal of the filter protection circuit 6 is connected to the positive terminal of the voice coil motor in the breathing valve.

[0067] Understandably, the filter protection circuit 6 can be a circuit composed of one or more of the following components: filter capacitor, inductor, resistor, and diode.

[0068] The working process of the above-mentioned breathing valve drive circuit is as follows: the signal output by the power supply circuit 5 is filtered by the filter protection circuit 6 and then flows to the positive terminal of the voice coil motor.

[0069] In this embodiment, the driving circuit of the breathing valve filters the signal output from the power supply circuit 5 by setting a filter protection circuit 6, which makes the signal waveform output from the power supply circuit 5 smooth, improves the signal quality, and provides good protection for the subsequent circuits.

[0070] In one embodiment, such as Figure 7 As shown, a circuit connection diagram of a filter protection circuit is provided. Figure 6Based on the driving circuit of the breathing valve shown, the filter protection circuit 6 includes: a first filter capacitor C1, a second filter capacitor C2, a third filter capacitor C3, and a first diode D1. One end of the first filter capacitor C1 is connected to the output terminal of the power supply circuit 4, and the other end of the first filter capacitor C1 is grounded. One end of the second filter capacitor C2 is connected to the output terminal of the power supply circuit 4, and the other end of the second filter capacitor C2 is connected to the input terminal of the first switching transistor 22. One end of the third filter capacitor C3 is connected to the output terminal of the power supply circuit 4, and the other end of the third filter capacitor C3 is grounded. The anode of the first diode D1 is connected to the input terminal of the first switching transistor 22, and the cathode of the first diode D1 is connected to the output terminal of the power supply circuit 4.

[0071] The working process of the above-mentioned breathing valve drive circuit is as follows: the signal output by the power supply circuit 4 is filtered by the first filter capacitor C1, the second filter capacitor C2, and the third filter capacitor C3 before flowing to the positive terminal of the voice coil motor.

[0072] In this embodiment, the driving circuit of the breathing valve filters the signal output by the power supply circuit 4 by setting the first filter capacitor C1, the second filter capacitor C2, and the third filter capacitor C3. The first diode D1 is a reverse discharge resistor, which can speed up the power-off of the voice coil motor.

[0073] In one embodiment, a ventilator is provided, which includes a control circuit for the breathing valve, a voice coil motor, and a breathing diaphragm as mentioned in any of the above embodiments. Preferably, the control circuit for the breathing valve is as follows: Figure 8 As shown, the drive circuit controls the force applied to the breathing diaphragm by controlling the voice coil motor to turn on and off, thereby controlling the breathing flow rate and positive end-expiratory pressure in the breathing valve.

[0074] In this embodiment, the ventilator uses a drive circuit to precisely control the voice coil motor, which reduces the cost of the ventilator while meeting the high precision requirements of the voice coil motor.

[0075] The above-described embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included within the protection scope of the present invention.

Claims

1. A driving circuit for a breathing valve, characterized in that, Includes: a first processor, a valve control circuit, and a valve monitoring circuit; The valve monitoring circuit has its input terminal connected to the negative terminal of the voice coil motor in the breathing valve, and its output terminal connected to the input terminal of the first processor. The valve monitoring circuit is used to monitor the signal of the negative terminal of the voice coil motor in the breathing valve and input the monitoring signal to the first processor. The valve control circuit includes a gate driver chip and a first switching transistor. The input terminal of the gate driver chip is connected to the first output terminal of the first processor, the output terminal of the gate driver chip is connected to the control terminal of the first switching transistor, the power supply terminal of the gate driver chip is connected to a first power supply, and the ground terminal of the gate driver chip is grounded. The input terminal of the first switching transistor is connected to the negative terminal of the voice coil motor in the breathing valve, and the output terminal of the first switching transistor is grounded. The first processor is used to output a drive signal to the gate driver chip and adjust the drive signal according to the monitoring signal. The gate driver chip is used to drive the first switching transistor according to the drive signal output by the first processor to control the voice coil motor in the breathing valve to turn on and off. The valve control circuit further includes a first resistor, a second resistor, a third resistor, a first capacitor, and a second capacitor. One end of the first resistor is connected to the control terminal of the first switching transistor, and the other end of the first resistor is connected to the output terminal of the gate driver chip. One end of the second resistor is connected to the first output terminal of the first processor, and the other end of the second resistor is connected to the input terminal of the gate driver chip. One end of the third resistor is connected to the input terminal of the gate driver chip, and the other end of the third resistor is grounded. One end of the first capacitor is connected to the power supply terminal of the gate driver chip, and the other end of the first capacitor is grounded. The second capacitor is connected in parallel with the first capacitor. The drive signal output by the first processor is divided by the second and third resistors and then flows to the gate driver chip. The signal output by the gate driver chip flows to the first switch after passing through the first resistor. The signal from the first power supply is filtered by the first and second capacitors and then flows into the gate driver chip.

2. The driving circuit for the breathing valve as described in claim 1, characterized in that, The valve monitoring circuit includes a current amplifier and a monitoring resistor. The negative input terminal of the current amplifier is connected to the input terminal of the first switching transistor, the positive input terminal of the current amplifier is connected to the negative terminal of the voice coil motor in the breather valve, the power supply terminal of the current amplifier is connected to a second power supply, the output terminal of the current amplifier is connected to the input terminal of the first processor, and the ground terminal of the current amplifier is grounded. One end of the monitoring resistor is connected to the positive input terminal of the current amplifier, and the other end of the monitoring resistor is connected to the negative input terminal of the current amplifier. The current amplifier is used to collect the current output from the negative terminal of the voice coil motor in the breather valve to both ends of the monitoring resistor.

3. The driving circuit for the breathing valve as described in claim 2, characterized in that, The valve monitoring circuit further includes: a dual series-connected switching diode, the cathode of which is connected to a second power supply, the anode of which is grounded, and the center point of the upper and lower diodes of which is connected to the output terminal of the current amplifier.

4. The driving circuit for the breathing valve as described in claim 3, characterized in that, The valve monitoring circuit further includes: a fourth resistor, a third capacitor, and a fourth capacitor. One end of the fourth resistor is connected to the output terminal of the current amplifier, and the other end of the fourth resistor is connected to the center point of the upper and lower transistors of the dual series switching diode. One end of the third capacitor is connected to the power supply terminal of the current amplifier, and the other end of the third capacitor is grounded. One end of the fourth capacitor is connected to the other end of the fourth resistor, and the other end of the fourth capacitor is grounded.

5. The driving circuit for the breathing valve as described in claim 1, characterized in that, The driving circuit of the breathing valve also includes: a second processor and a power supply circuit; The input terminal of the power supply circuit is connected to a third power source, and the output terminal of the power supply circuit is connected to the positive terminal of the voice coil motor in the breathing valve. The power supply circuit is used to provide a power supply signal to the positive terminal of the voice coil motor in the breathing valve. The output terminal of the second processor is connected to the control terminal of the power supply circuit, and the input terminal of the second processor is connected to the second output terminal of the first processor. The second processor is used to control the power supply signal output by the power supply circuit according to the processor fault signal output by the first processor.

6. The driving circuit for the breathing valve as described in claim 5, characterized in that, The power supply circuit includes a second switch, a third switch, a fourth switch, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor, and a tenth resistor. The input terminal of the second switch is connected to a third power supply, the output terminal of the second switch is connected to the positive terminal of the voice coil motor in the breathing valve, and the control terminal of the second switch is connected to one end of the eighth resistor. The input terminal of the third switch is connected to the other end of the eighth resistor, the output terminal of the third switch is grounded, the control terminal of the third switch is connected to one end of the ninth resistor, the input terminal of the fourth switch is connected to the other end of the ninth resistor, the output terminal of the fourth switch is grounded, the control terminal of the fourth switch is connected to one end of the tenth resistor, and the other end of the tenth resistor is connected to the output terminal of the second processor. One end of the fifth resistor is connected to the control terminal of the fourth switching transistor, and the other end of the fifth resistor is grounded. One end of the sixth resistor is connected to the third power supply, and the other end of the sixth resistor is connected to the input terminal of the fourth switching transistor. One end of the seventh resistor is connected to the third power supply, and the other end of the seventh resistor is connected to the input terminal of the third switching transistor.

7. The driving circuit for the breathing valve as described in claim 5, characterized in that, The driving circuit of the breathing valve further includes a filter protection circuit, the input terminal of which is connected to the output terminal of the power supply circuit, the first output terminal of which is connected to the input terminal of the first switching transistor, and the second output terminal of which is connected to the positive terminal of the voice coil motor in the breathing valve.

8. The driving circuit for the breathing valve as described in claim 7, characterized in that, The filtering protection circuit includes: a first filtering capacitor, a second filtering capacitor, a third filtering capacitor, and a first diode. One end of the first filtering capacitor is connected to the output terminal of the power supply circuit, and the other end of the first filtering capacitor is grounded. One end of the second filtering capacitor is connected to the output terminal of the power supply circuit, and the other end of the second filtering capacitor is connected to the input terminal of the first switching transistor. One end of the third filtering capacitor is connected to the output terminal of the power supply circuit, and the other end of the third filtering capacitor is grounded. The anode of the first diode is connected to the input terminal of the first switching transistor, and the cathode of the first diode is connected to the output terminal of the power supply circuit.

9. A ventilator, characterized in that, The ventilator includes a driving circuit for a breathing valve according to any one of claims 1-8, a voice coil motor, and a breathing diaphragm. The driving circuit controls the force applied to the breathing diaphragm by controlling the on and off states of the voice coil motor.

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