CN-117085227-B - Driving circuit of breather valve and breathing machine

CN117085227BCN 117085227 BCN117085227 BCN 117085227BCN-117085227-B

Abstract

The invention relates to the technical field of medical equipment, in particular to a driving circuit of a breather valve and a breathing machine, wherein the driving circuit of the breather valve comprises the following components: the valve control circuit is characterized in that a gate driving chip is arranged in the valve control circuit, the gate driving chip is low in cost, gate current can be rapidly supplied or absorbed, level conversion time is shortened, MOS (metal oxide semiconductor) tube heating can be greatly reduced, meanwhile, the valve monitoring circuit is used for monitoring signals of the negative electrode of the voice coil motor in the breather valve and inputting monitoring signals to the first processor, the first processor timely adjusts driving signals according to the monitoring signals, accuracy of the driving signals is guaranteed, accurate control of the first processor on the voice coil motor can be achieved, and force control accuracy of the voice coil motor is improved. The breather valve driving circuit provided by the invention can meet the high-precision requirement of the voice coil motor, and simultaneously reduce the cost of the breathing machine equipment.

Inventors

CHEN ZHIHUA
WANG SHAOHUA
ZHANG XIAOJUN
Xu chuangye

Assignees

深圳市安保医疗科技股份有限公司

Dates

Publication Date: 20260508
Application Date: 20230925

Claims (9)

1. A drive circuit of a breather valve is characterized by comprising a first processor, a valve control circuit and a valve monitoring circuit; The input end of the valve monitoring circuit is connected with the negative electrode of the voice coil motor in the breather valve, the output end of the valve monitoring circuit is connected with the input end of the first processor, and the valve monitoring circuit is used for monitoring the signal of the negative electrode of the voice coil motor in the breather valve and inputting a monitoring signal to the first processor; The valve control circuit comprises a gate driving chip and a first switch tube, wherein the input end of the gate driving chip is connected with the first output end of the first processor, the output end of the gate driving chip is connected with the control end of the first switch tube, the power end of the gate driving chip is connected with a first power supply, the grounding end of the gate driving chip is grounded, the input end of the first switch tube is connected with the negative electrode of the voice coil motor in the breather valve, the output end of the first switch tube is grounded, the first processor is used for outputting a driving signal to the gate driving chip and adjusting the driving signal according to the monitoring signal, and the gate driving chip is used for driving the first switch tube according to the driving signal output by the first processor so as to control the voice coil motor in the breather valve to be turned on and off; The valve control circuit further comprises a first resistor, a second resistor, a third resistor, a first capacitor and a second capacitor, wherein one end of the first resistor is connected with the control end of the first switch tube, the other end of the first resistor is connected with the output end of the gate driving chip, one end of the second resistor is connected with the first output end of the first processor, the other end of the second resistor is connected with the input end of the gate driving chip, one end of the third resistor is connected with the input end of the gate driving chip, the other end of the third resistor is grounded, one end of the first capacitor is connected with the power end of the gate driving chip, the other end of the first capacitor is grounded, and the second capacitor is connected with the first capacitor in parallel; The driving signal output by the first processor is divided by the second resistor and the third resistor and flows to the gate driving chip, the signal output by the gate driving chip flows to the first switch tube after passing through the first resistor, and the signal of the first power supply flows into the gate driving chip after being filtered by the first capacitor and the second capacitor.
2. The drive circuit for a respiratory valve as claimed in claim 1, wherein, The valve monitoring circuit comprises a current amplifier and a monitoring resistor, wherein the negative electrode input end of the current amplifier is connected with the input end of the first switch tube, the positive electrode input end of the current amplifier is connected with the negative electrode of the voice coil motor in the breather valve, the power end of the current amplifier is connected with a second power supply, the output end of the current amplifier is connected with the input end of the first processor, the grounding end of the current amplifier is grounded, one end of the monitoring resistor is connected with the positive electrode input end of the current amplifier, the other end of the monitoring resistor is connected with the negative electrode input end of the current amplifier, and the current amplifier is used for collecting current output from the negative electrode of the voice coil motor in the breather valve to the two ends of the monitoring resistor.
3. A drive circuit for a respiratory valve as claimed in claim 2, wherein, The valve monitoring circuit further comprises a double-series switch diode, wherein the cathode of the double-series switch diode is connected with a second power supply, the anode of the double-series switch diode is grounded, and the center points of the upper tube and the lower tube of the double-series switch diode are connected with the output end of the current amplifier.
4. A drive circuit for a respiratory valve as claimed in claim 3, wherein, The valve monitoring circuit further comprises a fourth resistor, a third capacitor and a fourth capacitor, wherein one end of the fourth resistor is connected with the output end of the current amplifier, the other end of the fourth resistor is connected with the central point of the upper tube and the lower tube of the double-series switch diode, one end of the third capacitor is connected with the power end of the current amplifier, the other end of the third capacitor is grounded, one end of the fourth capacitor is connected with the other end of the fourth resistor, and the other end of the fourth capacitor is grounded.
5. The drive circuit for a respiratory valve as claimed in claim 1, wherein, The driving circuit of the breather valve further comprises a second processor and a power supply circuit; the input end of the power supply circuit is connected with a third power supply, the output end of the power supply circuit is connected with the positive electrode of the voice coil motor in the breather valve, and the power supply circuit is used for providing a power supply signal for the positive electrode of the voice coil motor in the breather valve; The output end of the second processor is connected with the control end of the power supply circuit, the input end of the second processor is connected with the second output end of the first processor, and the second processor is used for controlling 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 of a breather valve according to claim 5, wherein, The power supply circuit comprises a second switching tube, a third switching tube, a fourth switching tube, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a ninth resistor and a tenth resistor, wherein the input end of the second switching tube is connected with a third power supply, the output end of the second switching tube is connected with the positive electrode of the voice coil motor in the breather valve, and the control end of the second switching tube is connected with one end of the eighth resistor; The input end of the third switching tube is connected with the other end of the eighth resistor, the output end of the third switching tube is grounded, the control end of the third switching tube is connected with one end of the ninth resistor, the input end of the fourth switching tube is connected with the other end of the ninth resistor, the output end of the fourth switching tube is grounded, the control end of the fourth switching tube is connected with one end of the tenth resistor, and the other end of the tenth resistor is connected with the output end of the second processor; One end of the fifth resistor is connected with the control end of the fourth switching tube, the other end of the fifth resistor is grounded, one end of the sixth resistor is connected with a third power supply, the other end of the sixth resistor is connected with the input end of the fourth switching tube, one end of the seventh resistor is connected with the third power supply, and the other end of the seventh resistor is connected with the input end of the third switching tube.
7. The driving circuit of a breather valve according to claim 5, wherein, The driving circuit of the breather valve further comprises a filtering protection circuit, wherein the input end of the filtering protection circuit is connected with the output end of the power supply circuit, the first output end of the filtering protection circuit is connected with the input end of the first switch tube, and the second output end of the filtering protection circuit is connected with the positive electrode of the voice coil motor in the breather valve.
8. The driving circuit of a breather valve according to claim 7, wherein, The filter protection circuit comprises a first filter capacitor, a second filter capacitor, a third filter capacitor and a first diode, wherein one end of the first filter capacitor is connected with the output end of the power supply circuit, the other end of the first filter capacitor is grounded, one end of the second filter capacitor is connected with the output end of the power supply circuit, the other end of the second filter capacitor is connected with the input end of the first switch tube, one end of the third filter capacitor is connected with the output end of the power supply circuit, the other end of the third filter capacitor is grounded, the positive electrode of the first diode is connected with the input end of the first switch tube, and the negative electrode of the first diode is connected with the output end of the power supply circuit.
9. A ventilator, characterized in that the ventilator comprises a driving circuit of the breather valve according to any one of claims 1-8, a voice coil motor, and a breathing membrane, and the driving circuit controls the force exerted on the breathing membrane by the voice coil motor by controlling the on and off of the voice coil motor.

Description

Driving circuit of breather valve and breathing machine Technical Field The invention relates to the technical field of medical equipment, in particular to a driving circuit of a breather valve and a breathing machine. Background The respirator is mainly used for treating patients with respiratory failure clinically, the accurate regulation of the pressure at the end of respiration according to the illness state of the patient is significant for the treatment of the patient, the pressure at the end of respiration is controlled by the force exerted on the respiratory diaphragm by the voice coil motor, and the prior art adopts DAC (digital-to-analog conversion) to control the constant current source drive and the pulse width modulation PWM drive. The DAC (digital-to-analog conversion) control constant current source drive control mode is simple, but the energy consumption is high, the MOS tube can heat, the pulse width modulation PWM drive mode is low, the MOS tube can be reduced, but the control accuracy of force is low, the dynamic performance of a voice coil motor is poor, the force control requirement in a breathing machine cannot be met, if the force control requirement is met, the breathing machine cost is improved by adopting a high-voltage swing rate and high-bandwidth comparator, and the problem of high breathing machine equipment cost is generated. Disclosure of Invention The embodiment of the invention provides a driving circuit of a breather valve and a breathing machine, which aim to solve the problem of high cost of the breathing machine caused by PWM driving in order to reduce the heating of an MOS tube in a traditional driving mode. In a first aspect, the invention provides a driving circuit of a breather valve, comprising a first processor, a valve control circuit and a valve monitoring circuit; The input end of the valve monitoring circuit is connected with the negative electrode of the voice coil motor in the breather valve, the output end of the valve monitoring circuit is connected with the input end of the first processor, and the valve monitoring circuit is used for monitoring the signal of the negative electrode of the voice coil motor in the breather valve and inputting a monitoring signal to the first processor; The valve control circuit comprises a gate driving chip and a first switch tube, wherein the input end of the gate driving chip is connected with the first output end of the first processor, the output end of the gate driving chip is connected with the control end of the first switch tube, the power end of the gate driving chip is connected with a first power supply, the grounding end of the gate driving chip is grounded, the input end of the first switch tube is connected with the negative electrode of the voice coil motor in the breather valve, the output end of the first switch tube is grounded, the first processor is used for outputting a driving signal to the gate driving chip and adjusting the driving signal according to the monitoring signal, and the gate driving chip is used for driving the first switch tube according to the driving signal output by the first processor so as to control the voice coil motor in the breather valve to conduct and turn off. In an embodiment, the valve control circuit further includes a first resistor, a second resistor, a third resistor, a first capacitor, and a second capacitor, wherein one end of the first resistor is connected to the control end of the first switch tube, the other end of the first resistor is connected to the output end of the gate driving chip, one end of the second resistor is connected to the first output end of the first processor, the other end of the second resistor is connected to the input end of the gate driving chip, one end of the third resistor is connected to the input end of the gate driving chip, the other end of the third resistor is grounded, one end of the first capacitor is connected to the power end of the gate driving chip, the other end of the first capacitor is grounded, and the second capacitor is connected in parallel with the first capacitor. In one embodiment, the valve monitoring circuit comprises a current amplifier and a monitoring resistor, wherein the negative electrode input end of the current amplifier is connected with the input end of the first switch tube, the positive electrode input end of the current amplifier is connected with the negative electrode of the voice coil motor in the breather valve, the power end of the current amplifier is connected with a second power supply, the output end of the current amplifier is connected with the input end of the first processor, the grounding end of the current amplifier is grounded, one end of the monitoring resistor is connected with the positive electrode input end of the current amplifier, the other end of the monitoring resistor is connected with the negative electrode input end of the current amplifier, and the current amplifier is us