CN212651205U - Proportional valve drive circuit and breathing machine - Google Patents
Proportional valve drive circuit and breathing machine Download PDFInfo
- Publication number
- CN212651205U CN212651205U CN202021736380.2U CN202021736380U CN212651205U CN 212651205 U CN212651205 U CN 212651205U CN 202021736380 U CN202021736380 U CN 202021736380U CN 212651205 U CN212651205 U CN 212651205U
- Authority
- CN
- China
- Prior art keywords
- circuit
- proportional valve
- resistor
- voltage
- operational amplifier
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000029058 respiratory gaseous exchange Effects 0.000 title abstract description 10
- 230000008030 elimination Effects 0.000 claims abstract description 30
- 238000003379 elimination reaction Methods 0.000 claims abstract description 30
- 230000001105 regulatory effect Effects 0.000 claims abstract description 15
- 238000005070 sampling Methods 0.000 claims description 75
- 239000003990 capacitor Substances 0.000 claims description 21
- 230000003321 amplification Effects 0.000 claims description 8
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 8
- 230000009471 action Effects 0.000 claims description 3
- 101710129178 Outer plastidial membrane protein porin Proteins 0.000 description 8
- 102100037820 Voltage-dependent anion-selective channel protein 1 Human genes 0.000 description 8
- 230000008859 change Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000000241 respiratory effect Effects 0.000 description 2
- 206010002091 Anaesthesia Diseases 0.000 description 1
- 208000004756 Respiratory Insufficiency Diseases 0.000 description 1
- 230000037005 anaesthesia Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000005288 electromagnetic effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 201000004193 respiratory failure Diseases 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
- 238000001356 surgical procedure Methods 0.000 description 1
- 238000002560 therapeutic procedure Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
Images
Abstract
The utility model discloses a proportional valve drive circuit and breathing machine, proportional valve drive circuit includes the blind spot elimination voltage input, proportional valve aperture adjustment voltage input, the fortune is put the circuit, switch circuit and proportional valve regulating circuit, the input of fortune is put the circuit and is connected with blind spot elimination voltage input and proportional valve aperture adjustment voltage input respectively, switch circuit's controlled end is connected with the output of fortune circuit, switch circuit's output and fortune are put the negative-going input of circuit and are connected, proportional valve regulating circuit's output and switch circuit's input are connected, proportional valve regulating circuit's input and adjustable voltage source are connected. The utility model is used for solve the lower technical problem of current proportional valve regulation precision.
Description
Technical Field
The utility model relates to a technical field of breathing machine, in particular to proportional valve drive circuit and breathing machine.
Background
In modern clinical medicine, a ventilator has been widely used in respiratory failure due to various reasons, anesthesia respiratory management during major surgery, respiratory support therapy and emergency resuscitation, and has occupied a very important place in the modern medical field as an effective means for manually replacing spontaneous ventilation. The adjustment of the gas flow of the breathing machine requires the proportional valve to adjust the gas flow by adjusting the opening of the gas outlet of the proportional valve. The opening of the air outlet hole needs to be adjusted by means of an electromagnetic effect, when the proportional valve is electrified, electromagnetic force is generated to push the valve core, the air outlet hole is opened, and when the current flowing through the proportional valve is larger, the opening of the air outlet hole is larger.
The conventional proportional valve drive is driven by a constant current source, and generally, the opening of the proportional valve is adjusted by a DAC (digital-to-analog converter) value of a CPU (processor). Because the proportional valve has dead zone current (the proportional valve is opened when the current flowing through the proportional valve is larger than a certain value), a part of DAC (digital-to-analog converter) values cannot change the opening degree of the proportional valve. For example, the VSO-MI 5.5V proportional valve of the PARK company has the dead zone current of about 200mA and the full-speed working current of about 400mA, so that only half of the DAC value can adjust the opening of the proportional valve, and the resolution is reduced by half.
SUMMERY OF THE UTILITY MODEL
The utility model mainly aims at providing a proportional valve drive circuit aims at solving the lower technical problem of current proportional valve regulation precision.
In order to achieve the above object, the present invention provides a proportional valve driving circuit, which includes:
the dead zone elimination voltage input end is used for connecting dead zone elimination voltage;
the proportional valve opening adjusting voltage input end is used for accessing proportional valve opening adjusting voltage;
the input end of the operational amplifier circuit is respectively connected with the dead zone elimination voltage input end and the proportional valve opening adjustment voltage input end, and the operational amplifier circuit is used for amplifying the voltage of a driving voltage formed by overlapping the dead zone elimination voltage and the proportional valve opening adjustment voltage and outputting the driving voltage as a first voltage signal;
the controlled end of the switching circuit is connected with the output end of the operational amplifier circuit, and the output end of the switching circuit is connected with the negative input end of the operational amplifier circuit and is used for executing switching action according to the first voltage signal;
and the output end of the proportional valve regulating circuit is connected with the input end of the switch circuit, and the input end of the proportional valve regulating circuit is connected with the adjustable voltage source and used for carrying out proportional valve regulation according to the switching state of the switch circuit and the first voltage signal.
Optionally, the operational amplifier circuit includes:
the positive input end of the first operational amplifier branch is connected with the dead zone elimination voltage input end and the proportional valve opening adjustment voltage input end at the same time, and is used for performing voltage amplification processing on the driving voltage formed by superposing the dead zone elimination voltage and the proportional valve opening adjustment voltage;
and the positive input end of the second operational amplifier branch is connected with the output end of the first operational amplifier branch and is used for performing voltage amplification processing on a second voltage signal output by the first operational amplifier branch.
Optionally, the first operational amplifier branch includes a first resistor, a second resistor, a seventh resistor, an eighth resistor, a ninth resistor, and a first operational amplifier, a first end of the first resistor is connected to the dead zone elimination voltage input terminal, and a second end of the first resistor, a first end of the second resistor, and a first end of the ninth resistor are respectively connected to a positive input terminal of the first operational amplifier; the second end of the second resistor is connected with the opening adjusting voltage input end of the proportional valve; the inverting input end of the first operational amplifier and the first end of the seventh resistor are respectively connected with the first end of the eighth resistor, the output end of the first operational amplifier is connected with the second end of the eighth resistor, and the connection node of the first operational amplifier and the first resistor is the output end of the first operational amplifier branch circuit; a second terminal of the ninth resistor and a second terminal of the seventh resistor are both grounded.
Optionally, the second operational amplifier branch includes a third resistor, a fourth resistor, a fifth resistor, a first capacitor, and a second operational amplifier, where a first end of the third resistor is a positive input end of the second operational amplifier branch, and a second end of the third resistor and a first end of the fourth resistor are respectively connected to the positive input end of the second operational amplifier; the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier, the connection node of the inverting input end of the second operational amplifier is the output end of the second operational amplifier branch, the power supply end of the second operational amplifier and the first end of the first capacitor are connected to a first power supply, and the grounding end of the second operational amplifier, the second end of the fourth resistor and the second end of the first capacitor are all grounded.
Optionally, the switch circuit includes a first switch tube, a gate of the first switch tube is a controlled end of the switch circuit, a first end of the first switch tube is an output end of the switch circuit, and a second end of the first switch tube is an input end of the switch circuit.
Optionally, the sixth resistor is a high-precision power resistor.
Optionally, the proportional valve circuit includes a first diode, a second capacitor, and a proportional valve, a negative electrode of the first diode, a first terminal of the second capacitor, and a first terminal of the proportional valve are interconnected, a connection node thereof is an input terminal of the proportional valve circuit, and a positive electrode of the first diode, a second terminal of the second capacitor, and a second terminal of the proportional valve are interconnected, a connection node thereof is an output terminal of the proportional valve circuit.
Optionally, the proportional valve driving circuit further includes a control circuit, and a first control signal output end of the control circuit is connected to the controlled end of the adjustable voltage source;
and the adjustable voltage source is used for outputting corresponding voltage according to the first control signal output by the control circuit.
Optionally, the proportional valve driving circuit further includes a microprocessor, a first sampling circuit and a second sampling circuit, the microprocessor further includes a first sampling end and a second sampling end, the sampling end of the first sampling circuit is connected to the input end of the switch circuit, and the output end of the first sampling circuit is connected to the first sampling end of the microprocessor; the sampling end of the second sampling circuit is connected with the output end of the switch circuit, the output end of the second sampling circuit is connected with the second sampling end of the microprocessor, and the third output end of the microprocessor is connected with the input end of the control circuit;
the first sampling circuit is used for collecting the input voltage of the switching circuit;
the second sampling circuit is used for collecting the output voltage of the switching circuit;
the microprocessor is further configured to output a corresponding second control signal to the control circuit according to a difference between the input voltage and the output voltage to control the magnitude of the output voltage of the adjustable voltage source.
Optionally, the first sampling circuit and the second sampling circuit each include a third operational amplifier, a tenth resistor, an eleventh resistor, and a twelfth resistor, a forward input end of the third operational amplifier is a sampling end of the first sampling circuit or a sampling end of the second sampling circuit, an inverting input end of the third operational amplifier is connected to a first end of the tenth resistor and a first end of the eleventh resistor, respectively, and an output end of the third operational amplifier is connected to a second end of the eleventh resistor and a first end of the twelfth resistor, respectively; a second end of the tenth resistor is grounded; a second end of the twelfth resistor is an output end of the first sampling circuit or an output end of the second sampling circuit.
The utility model also provides a breathing machine, the breathing machine includes as above proportional valve drive circuit and earphone.
The utility model discloses a proportional valve drive circuit includes blind spot elimination voltage input, proportional valve opening adjustment voltage input, operational amplifier circuit, switch circuit and proportional valve regulating circuit, and wherein, blind spot elimination voltage input inserts blind spot elimination voltage, and proportional valve opening adjustment voltage input inserts proportional valve opening adjustment voltage. And the operational amplifier circuit outputs a first voltage signal after voltage amplification processing is carried out on the driving voltage formed by superposing the dead zone eliminating voltage and the proportional valve opening degree adjusting voltage. The switching circuit performs a switching operation according to the first voltage signal. And the proportional valve regulating circuit is used for regulating the proportional valve according to the switching state of the switching circuit and the first voltage signal. In the technical scheme, when the dead zone eliminating voltage is connected to promote the voltage initial value input to the controlled end of the switching circuit by the operational amplifier circuit, the current of the proportional valve regulating circuit has enough current value to open the electromagnetic valve when the voltage of the controlled end of the switching circuit is the voltage initial value by reasonably setting the dead zone eliminating voltage. Thereby solve the lower technical problem of current proportional valve regulating accuracy.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic block diagram of a proportional valve driving circuit according to the present invention;
fig. 2 is a schematic block diagram of a proportional valve driving circuit according to the present invention;
fig. 3 is a schematic circuit diagram of the driving circuit of the proportional valve according to the present invention.
The objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
In the following, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention, and if there is a description related to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is only used for descriptive purposes and is not to be interpreted as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
The utility model provides a proportional valve drive circuit to solve the lower technical problem of current proportional valve regulation precision.
In one embodiment, as shown in fig. 1 and fig. 2, the proportional valve driving circuit includes a dead zone elimination voltage input terminal 10, a proportional valve opening adjustment voltage input terminal 20, an operational amplifier circuit 30, a switch circuit 40, and a proportional valve adjustment circuit 50, wherein the input terminal of the operational amplifier circuit 30 is connected to the dead zone elimination voltage input terminal 10 and the proportional valve opening adjustment voltage input terminal 20, the controlled terminal of the switch circuit 40 is connected to the output terminal of the operational amplifier circuit 30, the output terminal of the switch circuit 40 is connected to the negative input terminal of the operational amplifier circuit 30, the output terminal of the proportional valve adjustment circuit 50 is connected to the input terminal of the switch circuit 40, and the input terminal of the proportional valve adjustment circuit 50 is connected to the adjustable voltage source 60.
The dead zone eliminating voltage input end 10 is connected to a dead zone eliminating voltage, the proportional valve opening adjusting voltage input end 20 is connected to a proportional valve opening adjusting voltage, and the operational amplifier circuit 30 amplifies the voltage of a driving voltage formed by overlapping the dead zone eliminating voltage and the proportional valve opening adjusting voltage and outputs the driving voltage as a first voltage signal. The switching circuit 40 performs a switching operation according to the first voltage signal. The proportional valve adjusting circuit 50 performs proportional valve adjustment according to the switching state of the switching circuit 40 and the first voltage signal. In the above technical solution, the dead zone eliminating voltage is switched in to raise the initial voltage value input to the controlled end of the switch circuit 40 by the operational amplifier circuit 30, and the dead zone eliminating voltage is set reasonably so that the current of the proportional valve regulating circuit 50 has a current value of a sufficient magnitude to turn on the solenoid valve when the voltage of the controlled end of the switch circuit 40 is the initial voltage value. Thereby solve the lower technical problem of current proportional valve regulating accuracy. The adjustment precision of the proportional valve can be improved on the basis of not changing the opening adjustment voltage of the proportional valve.
Alternatively, the voltage at the dead zone elimination voltage input terminal 10 is output by a DAC (digital-to-analog converter) of the microprocessor, and the DAC (digital-to-analog converter) of the microprocessor can be selected as required to improve the accuracy of the value of the output dead zone elimination voltage, so as to realize precise control and further improve the adjustment precision of the proportional valve.
Optionally, as shown in fig. 3, the operational amplifier circuit 30 includes a first operational amplifier branch 301 and a second operational amplifier branch 302, a positive input terminal of the first operational amplifier branch 301 is connected to both the dead zone elimination voltage input terminal 10 and the proportional valve opening adjustment voltage input terminal 20, and a positive input terminal of the second operational amplifier branch 302 is connected to an output terminal of the first operational amplifier branch 301.
The first operational amplifier branch 301 amplifies the driving voltage formed by superimposing the dead zone eliminating voltage and the proportional valve opening degree adjusting voltage, and the second operational amplifier branch 302 amplifies the second voltage signal output by the first operational amplifier branch 301. Through the process, the driving voltage can be amplified by corresponding times according to the amplification factor of the operational amplifier branch, so that the switching requirement of the switching circuit 40 is met.
In an embodiment, as shown in fig. 3, the first operational amplifier branch 301 includes a first resistor R1, a second resistor R2, a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, and a first operational amplifier U1A, a first end of the first resistor R1 is connected to the dead zone cancellation voltage input terminal 10, and a second end of the first resistor R1, a first end of the second resistor R2, and a first end of the ninth resistor R9 are respectively connected to the positive input terminal of the first operational amplifier; a second end of the second resistor R2 is connected to the proportional valve opening adjustment voltage input terminal 20; the inverting input end of the first operational amplifier and the first end of the seventh resistor R7 are respectively connected with the first end of the eighth resistor R8, the output end of the first operational amplifier is connected with the second end of the eighth resistor R8, and the connection node of the first operational amplifier and the first end of the seventh resistor R7 is the output end of the first operational amplifier branch 301; the second terminal of the ninth resistor R9 and the second terminal of the seventh resistor R7 are both connected to ground.
The voltages formed by the first resistor R1, the second resistor R2 and the ninth resistor R9 are superimposed to form a driving voltage, the resistance value of the first resistor R1 is denoted as R1, the resistance value of the second resistor R2 is denoted as R2, the resistance value of the seventh resistor R7 is denoted as R7, the resistance value of the eighth resistor R8 is denoted as R8, and the resistance value of the ninth resistor R9 is denoted as R9, at this time, the input voltage of the first operational amplifier is denoted as V1in, the output voltage is denoted as V1out, the dead zone elimination voltage is denoted as VREF, and the proportional valve opening adjustment voltage is denoted as VDAC, at this time:
V1in＝(R1/(R1+R9)*VREF)+(R2/(R1+R9)*VDAC)
V1out＝(1+R8/R7)*V1in
optionally, the first resistor R1, the second resistor R2, the seventh resistor R7, the eighth resistor R8 and the ninth resistor R9 are high-precision power resistors. The first operational amplifier is a high-precision operational amplifier.
Optionally, as shown in fig. 3, the second operational amplifier branch 302 includes a third resistor R3, a fourth resistor R4, a fifth resistor R5, a first capacitor C1, and a second operational amplifier U1B, a first end of the third resistor R3 is a positive input end of the second operational amplifier branch 302, and a second end of the third resistor R3 and a first end of the fourth resistor R4 are respectively connected to the positive input end of the second operational amplifier U1B; an inverting input terminal of the second operational amplifier U1B is connected to an output terminal of the second operational amplifier U1B, a connection node thereof is an output terminal of the second operational amplifier branch 302, a power supply terminal of the second operational amplifier U1B and a first terminal of the first capacitor C1 are connected to the first power supply VC1, and a ground terminal of the second operational amplifier U1B, a second terminal of the fourth resistor R4, and a second terminal of the first capacitor C1 are all grounded.
The resistance of the third resistor R3 is denoted as R3, the resistance of the fourth resistor R4 is denoted as R4, the resistance of the fifth resistor R5 is denoted as R5, the capacitance of the first capacitor C1 is denoted as C1, the voltage across R, S of the first switching tube Q1 is denoted as Rgs, at this time, the input voltage of the second operational amplifier U1B is denoted as V2in, the output voltage is denoted as V2out, the dead zone elimination voltage is denoted as VREF, and the proportional valve opening adjustment voltage is denoted as VDAC, at this time:
V2in＝V1out
V2out＝[R4/(R3+R4)]*[1+(R5+Rgs)/R6]*V2in
optionally, the third resistor R3, the fourth resistor R4 and the fifth resistor R5 are high-precision power resistors. The second operational amplifier U1B is a high precision operational amplifier. The first capacitor C1 is a ceramic chip capacitor.
Alternatively, as shown in fig. 3, the switch circuit 40 includes a first switch tube Q1, the gate of the first switch tube Q1 is the controlled terminal of the switch circuit 40, the first terminal of the first switch tube Q1 is the output terminal of the switch circuit 40, and the second terminal of the first switch tube Q1 is the input terminal of the switch circuit 40.
By controlling the switching and the degree of switching of the first switching tube Q1, the change of the current of the proportional valve driving circuit can be controlled.
Alternatively, as shown in fig. 3, the proportional valve circuit includes a first diode D1, a second capacitor C2, and a proportional valve K1, a cathode of the first diode D1, a first terminal of the second capacitor C2, and a first terminal of the proportional valve K1 are interconnected, a connection node thereof is an input terminal of the proportional valve K1 circuit, and an anode of the first diode D1, a second terminal of the second capacitor C2, and a second terminal of the proportional valve K1 are interconnected, a connection node thereof is an output terminal of the proportional valve K1 circuit.
The voltage of the adjustable voltage source 60 is denoted as VC2, the internal resistance of the first switching tube Q1 is denoted as Rp, the resistance value of the sixth resistor is denoted as R6, the voltage of the first switching tube Q1 is denoted as Umos, and the current of the first switching tube Q1 is denoted as Ip:
Umos＝VC2-Ip*(Rp+R6)
optionally, the sixth resistor is a high precision power resistor.
Optionally, the first switching transistor Q1 is a MOS transistor.
Optionally, as shown in fig. 2, the proportional valve driving circuit further includes a control circuit 70, and a first control signal output terminal of the control circuit 70 is connected to the controlled terminal of the adjustable voltage source 60.
The adjustable voltage source 60 outputs a corresponding voltage according to the first control signal output by the control circuit 70. The output voltage of the voltage source can be adjusted through the scheme.
Optionally, as shown in fig. 3, the proportional valve driving circuit further includes a microprocessor 100, a first sampling circuit 80 and a second sampling circuit 90, the control circuit 70 further includes a first sampling terminal and a second sampling terminal, the sampling terminal of the first sampling circuit 80 is connected to the input terminal of the switch circuit 40, and the output terminal of the first sampling circuit 80 is connected to the first sampling terminal of the microprocessor 100; the sampling terminal of the second sampling circuit 90 is connected to the output terminal of the switch circuit 40, the output terminal of the second sampling circuit 90 is connected to the second sampling terminal of the microprocessor 100, and the third output terminal of the microprocessor 100 is connected to the input terminal of the control circuit 70.
The first sampling circuit 80 collects an input voltage of the switching circuit 40, and the second sampling circuit 90 collects an output voltage of the switching circuit 40. The microprocessor 100 outputs a corresponding second control signal to the control circuit 70 according to the difference between the input voltage and the output voltage to control the magnitude of the output voltage of the adjustable voltage source 60. Thereby feedback-adjusting the output voltage of the adjustable voltage source 60
Optionally, the first sampling circuit 80 and the second sampling circuit 90 each include a third operational amplifier U2B, a tenth resistor R9, an eleventh resistor R11, and a twelfth resistor R12, a forward input end of the third operational amplifier is a sampling end of the first sampling circuit 80 or a sampling end of the second sampling circuit 90, an inverting input end of the third operational amplifier is respectively connected to a first end of the tenth resistor R10 and a first end of the eleventh resistor R11, and an output end of the third operational amplifier is respectively connected to a second end of the eleventh resistor R11 and a first end of the twelfth resistor R12; a second end of the tenth resistor R10 is grounded; a second terminal of the twelfth resistor R12 is an output terminal of the first sampling circuit 80 or an output terminal of the second sampling circuit 90.
The sampling circuit composed of the third operational amplifier U2B, the tenth resistor R10, the eleventh resistor R11 and the twelfth resistor R12 is used for sampling, so that the sampled voltage can be amplified or divided according to the requirement, and the safety of the voltage connected to the control circuit 70 is ensured.
Optionally, the proportional valve driving circuit further includes a sixth resistor R6, a first end of the sixth resistor R6 is connected to the sampling end of the second sampling circuit 90, and a second end of the sixth resistor R6 is connected to ground. The sixth resistor R6 is used for voltage division sampling.
The advantages of feedback regulating the voltage of the adjustable voltage source 60 are explained with reference to the following embodiments:
the advantage of this scheme lies in reducing the consumption of first switch tube Q1, and the implementation scheme is as follows:
the power supply voltage of the proportional valve K1 adopts an adjustable voltage source 60, the output voltage of the adjustable voltage source 60 is VC2, the output voltage regulation of the adjustable voltage source 60 can be adjusted through a control circuit 70, the output voltage VC2 of the adjustable voltage source 60 is correspondingly increased along with the continuous increase of the working current of the proportional valve K1, and therefore the tube voltage drop at the two ends of the first switching tube Q1 is always kept to be a very small opening voltage, and the tube voltage drop cannot be increased along with the reduction of the current of the proportional valve K1.
The output voltage of the adjustable voltage source 60 is calculated according to the sampling voltage V1 of the first sampling circuit 80 and the sampling voltage V2 of the second sampling circuit 90, where V1 is the voltage across the sixth resistor R6R6, and V2 is the sum of the voltage drops of the sixth resistor R6R6 and the first switch tube Q1, so that the voltage drop Vmos across the first switch tube Q1 is calculated as V2-V1. If the microprocessor 100 detects that Vmos is relatively large during the adjustment of the current to the proportional valve K1, the microprocessor 100 needs to output a control signal to the control circuit 70 to adjust the adjustable voltage source 60 to reduce its output voltage. It is always ensured during the regulation that V1 cannot change, so that the current of the proportional valve K1 cannot change. Therefore, the tube voltage drop at the two ends of the first switch tube Q1 can be always kept at a very small starting voltage, and the purpose of reducing power consumption is achieved. It should be noted that the control circuit 70 may be implemented by various control chips.
The principle of the present invention is described below with reference to fig. 1, 2, and 3:
the utility model discloses an in the scheme, voltage input 10 inserts the blind spot elimination voltage in the blind spot elimination, proportional valve K1 aperture adjustment voltage input 20 inserts proportional valve K1 aperture adjustment voltage, at first operational amplifier's forward input end, the drive voltage input of blind spot elimination voltage and proportional valve K1 aperture adjustment voltage stack formation, drive voltage exports the controlled end of first switch tube Q1 after first operational amplifier and second operational amplifier U1B's two-stage amplification afterwards, first switch tube Q1 carries out the switching action according to the first voltage signal of second operational amplifier U1B output. The proportional valve K1 regulates the proportional valve K1 based on the switch state of the switch circuit 40 and the first voltage signal. In the technical scheme, the dead zone eliminating voltage is connected to increase the initial voltage value output to the grid of the first switching tube Q1 after the two-stage amplification of the first operational amplifier and the second operational amplifier U1B, the voltage of the current of the proportional valve K1 at the grid of the first switching tube Q1 is the initial voltage value through reasonably setting the dead zone eliminating voltage, and the electromagnetic valve is opened by a current value with a sufficient magnitude. At this time, after the dead band elimination voltage VREF is properly selected, the proportional valve K1 is just opened when the opening adjustment voltage VDAC of the proportional valve K1 is just outputted, and the proportional valve K1 is just operated at full speed when the opening adjustment voltage VDAC of the proportional valve K1 is maximum, so that all the VDAC values can adjust the opening of the proportional valve K1.
Based on the above scheme and the circuit diagram shown in fig. 3, a way of reasonably setting the dead zone elimination voltage is provided as follows:
firstly, the relation of the working current of the proportional valve K1 is as follows:
wherein:
to ensure that the resolution of the proportional valve K1 is maximized and that the proportional valve K1 can operate at full speed, the following relationship needs to be satisfied:
for convenience of circuit calculation and analysis, R1 ═ R2 ═ R9 (with resistance values of 1k to 10 k), and R7 ═ 2 ═ R8 (with resistance values of 1k to 10k for R8) may be selected, so that the above current formula can be simplified as follows:
in addition VDACmaxIs the maximum output voltage of the DAC, the magnitude of which is known, IDead zone currentAnd IDead zone current、ICurrent at full speedThe proportional valve K1 is related to the characteristics of the proportional valve K1 and can be noted on specifications, so the proportional relation between R3 and R4 can be obtained according to the formula, and the proper resistance value can be selected according to the proportional relation. When the proportional relationship between R3 and R4 is known, the magnitude of VREF can be calculated according to the above formula. From the above analysis, VREF and R1, R2, R3, R4, R5, R7, R8 can be deduced, and since there is also an operating current for the proportional valve K1 when VDAC is 0, which increases power consumption, it is preferable that VREF is also controlled by the microprocessor 100, and VREF is 0 when the proportional valve K1 is not operating.
Through the scheme, the defect that only partial opening adjusting voltage VDAC value of the proportional valve K1 can be used for adjusting the opening of the proportional valve K1 in the prior art is overcome, and the resolution of the proportional valve K1 is greatly improved.
In order to achieve the above object, the present invention further provides a ventilator, which includes the above proportional valve driving circuit.
It is worth noting, because the utility model discloses the breathing machine has contained above-mentioned proportional valve drive circuit's whole embodiments, consequently the utility model discloses the breathing machine has above-mentioned proportional valve drive circuit's all beneficial effects, and it is no longer repeated here.
Above only be the utility model discloses an optional embodiment to not consequently restrict the utility model discloses a patent range, all are in the utility model discloses a conceive, utilize the equivalent structure transform that the content of description and drawing did, or direct/indirect application all is included in other relevant technical field the utility model discloses a patent protection within range.
Claims (10)
1. A proportional valve drive circuit, comprising:
the dead zone elimination voltage input end is used for connecting dead zone elimination voltage;
the proportional valve opening adjusting voltage input end is used for accessing proportional valve opening adjusting voltage;
the input end of the operational amplifier circuit is respectively connected with the dead zone elimination voltage input end and the proportional valve opening adjustment voltage input end, and the operational amplifier circuit is used for amplifying the voltage of a driving voltage formed by overlapping the dead zone elimination voltage and the proportional valve opening adjustment voltage and outputting the driving voltage as a first voltage signal;
the controlled end of the switching circuit is connected with the output end of the operational amplifier circuit, and the output end of the switching circuit is connected with the negative input end of the operational amplifier circuit and is used for executing switching action according to the first voltage signal;
and the output end of the proportional valve regulating circuit is connected with the input end of the switch circuit, and the input end of the proportional valve regulating circuit is connected with the adjustable voltage source and used for carrying out proportional valve regulation according to the switching state of the switch circuit and the first voltage signal.
2. The proportional valve drive circuit of claim 1, wherein the op-amp circuit comprises:
the positive input end of the first operational amplifier branch is connected with the dead zone elimination voltage input end and the proportional valve opening adjustment voltage input end at the same time, and is used for performing voltage amplification processing on the driving voltage formed by superposing the dead zone elimination voltage and the proportional valve opening adjustment voltage;
and the positive input end of the second operational amplifier branch is connected with the output end of the first operational amplifier branch and is used for performing voltage amplification processing on a second voltage signal output by the first operational amplifier branch.
3. The proportional valve driving circuit as claimed in claim 2, wherein the first operational amplifier branch comprises a first resistor, a second resistor, a seventh resistor, an eighth resistor, a ninth resistor and a first operational amplifier, a first end of the first resistor is connected to the dead-zone cancellation voltage input terminal, and a second end of the first resistor, a first end of the second resistor and a first end of the ninth resistor are respectively connected to the positive input terminal of the first operational amplifier; the second end of the second resistor is connected with the opening adjusting voltage input end of the proportional valve; the inverting input end of the first operational amplifier and the first end of the seventh resistor are respectively connected with the first end of the eighth resistor, the output end of the first operational amplifier is connected with the second end of the eighth resistor, and the connection node of the first operational amplifier and the first resistor is the output end of the first operational amplifier branch circuit; a second terminal of the ninth resistor and a second terminal of the seventh resistor are both grounded.
4. The proportional valve driving circuit as claimed in claim 2, wherein the second operational amplifier branch comprises a third resistor, a fourth resistor, a fifth resistor, a first capacitor and a second operational amplifier, a first end of the third resistor is a positive input end of the second operational amplifier branch, and a second end of the third resistor and a first end of the fourth resistor are respectively connected to the positive input end of the second operational amplifier; the inverting input end of the second operational amplifier is connected with the output end of the second operational amplifier, the connection node of the inverting input end of the second operational amplifier is the output end of the second operational amplifier branch, the power supply end of the second operational amplifier and the first end of the first capacitor are connected to a first power supply, and the grounding end of the second operational amplifier, the second end of the fourth resistor and the second end of the first capacitor are all grounded.
5. The proportional valve driving circuit as claimed in claim 1, wherein the switching circuit comprises a first switching tube, a gate of the first switching tube is a controlled terminal of the switching circuit, a first terminal of the first switching tube is an output terminal of the switching circuit, and a second terminal of the first switching tube is an input terminal of the switching circuit.
6. The proportional valve drive circuit of claim 1, wherein the proportional valve circuit comprises a first diode, a second capacitor, and a proportional valve, wherein a cathode of the first diode, a first terminal of the second capacitor, and a first terminal of the proportional valve are interconnected with a connection node being an input terminal of the proportional valve circuit, and wherein an anode of the first diode, a second terminal of the second capacitor, and a second terminal of the proportional valve are interconnected with a connection node being an output terminal of the proportional valve circuit.
7. The proportional valve drive circuit of any of claims 1-6, further comprising a control circuit, a first control signal output of the control circuit being connected to the controlled terminal of the adjustable voltage source;
and the adjustable voltage source is used for outputting corresponding voltage according to the first control signal output by the control circuit.
8. The proportional valve driving circuit of claim 7, further comprising a microprocessor, a first sampling circuit and a second sampling circuit, wherein the microprocessor further comprises a first sampling terminal and a second sampling terminal, the sampling terminal of the first sampling circuit is connected to the input terminal of the switching circuit, and the output terminal of the first sampling circuit is connected to the first sampling terminal of the microprocessor; the sampling end of the second sampling circuit is connected with the output end of the switch circuit, the output end of the second sampling circuit is connected with the second sampling end of the microprocessor, and the third output end of the microprocessor is connected with the input end of the control circuit;
the first sampling circuit is used for collecting the input voltage of the switching circuit;
the second sampling circuit is used for collecting the output voltage of the switching circuit;
the microprocessor is further configured to output a corresponding second control signal to the control circuit according to a difference between the input voltage and the output voltage to control the magnitude of the output voltage of the adjustable voltage source.
9. The proportional valve driving circuit of claim 8, wherein the first sampling circuit and the second sampling circuit each comprise a third operational amplifier, a tenth resistor, an eleventh resistor, and a twelfth resistor, wherein a forward input terminal of the third operational amplifier is a sampling terminal of the first sampling circuit or a sampling terminal of the second sampling circuit, an inverting input terminal of the third operational amplifier is connected to a first terminal of the tenth resistor and a first terminal of the eleventh resistor, respectively, and an output terminal of the third operational amplifier is connected to a second terminal of the eleventh resistor and a first terminal of the twelfth resistor, respectively; a second end of the tenth resistor is grounded; a second end of the twelfth resistor is an output end of the first sampling circuit or an output end of the second sampling circuit.
10. A ventilator comprising a proportional valve drive circuit as claimed in any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021736380.2U CN212651205U (en) | 2020-08-17 | 2020-08-17 | Proportional valve drive circuit and breathing machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021736380.2U CN212651205U (en) | 2020-08-17 | 2020-08-17 | Proportional valve drive circuit and breathing machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212651205U true CN212651205U (en) | 2021-03-05 |
Family
ID=74770561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021736380.2U Active CN212651205U (en) | 2020-08-17 | 2020-08-17 | Proportional valve drive circuit and breathing machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212651205U (en) |
-
2020
- 2020-08-17 CN CN202021736380.2U patent/CN212651205U/en active Active
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN111474975A (en) | L DO output current sampling circuit and sampling precision adjusting method | |
| CN208477417U (en) | A kind of LDO flow restriction not increasing quiescent current | |
| CN212651205U (en) | Proportional valve drive circuit and breathing machine | |
| CN107968566A (en) | A kind of power-switching circuit | |
| CN110428039A (en) | A kind of PLC technology RF power amplification power supply module | |
| CN107707210A (en) | A kind of zeroing high-gain differential amplifier circuit certainly | |
| CN111905227A (en) | Proportional valve drive circuit and breathing machine | |
| CN106301311B (en) | A kind of high slope linear current slot of high-precision | |
| CN111857230B (en) | Linear voltage stabilizer and electronic equipment | |
| CN105013057A (en) | Positive end-expiratory pressure control system and method | |
| CN207677621U (en) | A kind of reference voltage output device and Switching Power Supply | |
| CN201562185U (en) | Circuit for regulating high-level voltage at low level | |
| WO2014059736A1 (en) | Output voltage detection circuit of dc/dc conversion circuit | |
| CN108418432A (en) | Improve control circuit, control method and the Switching Power Supply of load dynamic response | |
| CN202210783U (en) | Calculation amplifying circuit | |
| CN206099803U (en) | Voltage closed -loop control type AC -DC conversion circuit | |
| CN214623448U (en) | LDO (Low dropout regulator) with high anti-interference performance | |
| CN220438808U (en) | Industrial high-power constant current source circuit | |
| CN206962712U (en) | A kind of adjustable DC high voltage power supply | |
| CN220510980U (en) | Band-type brake power supply circuit and elevator band-type brake control system | |
| CN113110242B (en) | High-efficiency analog quantity signal output device | |
| CN102386865A (en) | Operational amplification circuit and system | |
| CN217385630U (en) | High-voltage current adoption circuit | |
| CN109327145A (en) | A kind of Switching Power Supply of output ripple suppression circuit topological structure | |
| CN111711435B (en) | Method for improving safety of power switch tube in current-limiting control system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20210519 Address after: A1302, Shenzhen national engineering laboratory building, No.20, Gaoxin South 7th Road, high tech Zone community, Yuehai street, Nanshan District, Shenzhen, Guangdong 518000 Patentee after: AMBULANC (SHENZHEN) TECH. Co.,Ltd. Address before: A1302, Shenzhen national engineering laboratory building, No.20, Gaoxin South 7th Road, high tech Zone community, Yuehai street, Nanshan District, Shenzhen, Guangdong 518000 Patentee before: AMBULANC (SHENZHEN) TECH. Co.,Ltd. Patentee before: SHENZHEN XINZHIXING MEDICAL TECHNOLOGY Co.,Ltd. |
|
| TR01 | Transfer of patent right | ||
| CP01 | Change in the name or title of a patent holder |
Address after: A1302, Shenzhen national engineering laboratory building, No.20, Gaoxin South 7th Road, high tech Zone community, Yuehai street, Nanshan District, Shenzhen, Guangdong 518000 Patentee after: Shenzhen Security Medical Technology Co.,Ltd. Address before: A1302, Shenzhen national engineering laboratory building, No.20, Gaoxin South 7th Road, high tech Zone community, Yuehai street, Nanshan District, Shenzhen, Guangdong 518000 Patentee before: AMBULANC (SHENZHEN) TECH. Co.,Ltd. |
|
| CP01 | Change in the name or title of a patent holder | ||
| CP03 | Change of name, title or address |
Address after: 518000, Building 1, 101, Evergrande Fashion Huigu Building, Fulong Road, Shanghenglang Community, Dalang Street, Longhua District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Security Medical Technology Co.,Ltd. Country or region after: China Address before: A1302, Shenzhen national engineering laboratory building, No.20, Gaoxin South 7th Road, high tech Zone community, Yuehai street, Nanshan District, Shenzhen, Guangdong 518000 Patentee before: Shenzhen Security Medical Technology Co.,Ltd. Country or region before: China |
|
| CP03 | Change of name, title or address |