CN101785896B - Proportional valve control method and circuit thereof - Google Patents
Proportional valve control method and circuit thereof Download PDFInfo
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- CN101785896B CN101785896B CN2010101030928A CN201010103092A CN101785896B CN 101785896 B CN101785896 B CN 101785896B CN 2010101030928 A CN2010101030928 A CN 2010101030928A CN 201010103092 A CN201010103092 A CN 201010103092A CN 101785896 B CN101785896 B CN 101785896B
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- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 20
- 238000009423 ventilation Methods 0.000 claims abstract description 19
- 239000003990 capacitor Substances 0.000 claims description 24
- 230000001105 regulatory effect Effects 0.000 claims description 22
- 238000012360 testing method Methods 0.000 claims description 17
- 230000001276 controlling effect Effects 0.000 claims description 16
- 230000007704 transition Effects 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 3
- 230000008030 elimination Effects 0.000 claims 1
- 238000003379 elimination reaction Methods 0.000 claims 1
- 230000002159 abnormal effect Effects 0.000 abstract description 3
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 7
- 230000003444 anaesthetic effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001939 inductive effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000002685 pulmonary effect Effects 0.000 description 1
- 230000029058 respiratory gaseous exchange Effects 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 230000002459 sustained effect Effects 0.000 description 1
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Abstract
The invention discloses a proportional valve control method which is used for controlling the ventilation flow of a proportional valve V1 in a valve interface circuit. In the proportional valve control method, a processor emits a preset digital value voltage; an analog-digital conversion circuit converts the digital value voltage into an analogue value voltage; a reference voltage regulation circuit regulates the analogue value voltage into a reference voltage; a driving circuit controls the opening degree of the proportional valve V1 according to the reference voltage; a current detection circuit detects whether the working state of the proportional valve V1 is normal or not; if the working state of the proportional valve is normal, a detection result is output to the processor, and the processor controls the ventilation flow of the proportional valve V1; and if the working state of the proportional valve is abnormal, a protection circuit cuts off the driving circuit by force. The invention also provides a proportional valve control circuit. The proportional valve control method and the circuit thereof dynamically regulate the flow, effectively control the ventilation flow and improve the reliability and the security of the machine.
Description
[technical field]
The present invention relates to the control of medical apparatus and instruments, relate in particular to a kind of proportional valve control method and circuit thereof.
[background technology]
At present, the medical electronics product is respirator and anesthetic machine for example, is severe case's important salvage tool, and is more and more general in clinical practice, how to improve the reliability and the safety of ventilation, to clinical significant.Respirator and anesthetic machine mainly are made up of gas circuit structure and electrical control two large divisions, gas circuit structure provides the patient respiration gas flow loop, electric control system provides the driving of device parts such as valve, pick off, and the extraction of the sensor signal of parameter monitoring handled, thereby realize adjusting and monitoring, to reach the purpose that appropriate throughput is provided to patient to throughput.
Present most of machine adopts proportioning valve, realization is to the adjusting of throughput, the principle device of this method control flow as shown in Figure 6, this device comprises to be handled and change-over circuit 110, reference voltage regulating circuit 120, drive circuit 130, valve interface circuit 140 and drive current testing circuit 150.Handle and change-over circuit 110 output predeterminated voltages, this voltage is processed into a reference voltage through reference voltage regulating circuit 120, the size of this reference voltage determined the to flow through size of current of proportioning valve V1 in the valve interface circuit 140, the size of current of proportioning valve V1 of flowing through has determined valve opening, and then the flow through throughput of valve of control, realize control to flow.And the release electric current of inductive load valve of diode D1 in the valve interface circuit 140 plays the afterflow protective effect.Drive current testing circuit 150 detects the size of the drive current of valve, converts the drive current of valve to voltage, gives ADC and gathers and analyzing and processing, and then judge the duty of valve, provides reference process, for example reports to the police etc.
This circuit is only realized the dynamic adjustments of flow, lacks the abnormal protection measure.Such as: if the negative supply of the amplifier U1B that drive circuit 130 comprises (VCC) breaks for a certain reason, analysis circuit is easily known, the grid of driving tube Q1 (end that connects resistance R 5) is in high level all the time, driving tube Q1 is in conducting state (test shows it also is like this), the corresponding power supply open mode that is in of valve V1 always.At this moment, the reference voltage of processor output does not have control action, and throughput is in runaway condition, if this valve V1 controls to patient ventilating, then air-flow can stop far from into patient pulmonary, will damage patient.Thereby from the consideration of ventilation security standpoint, this circuit arrangement does not play the security protection effect.
Prior art need to be improved and enhanced.
[summary of the invention]
The technical problem to be solved in the present invention provides a kind of proportional valve control method that can effectively improve safety and based on the circuit of this method.
The invention provides a kind of proportional valve control method, ventilation flow rate to the proportioning valve V1 in the valve interface circuit is controlled, processor sends default digital quantity voltage, D/A converter module becomes analog quantity voltage with described digital quantity voltage transitions, the reference voltage regulating circuit is adjusted to reference voltage with described analog quantity voltage, it is characterized in that, also comprise: drive circuit is according to the aperture of reference voltage control ratio valve V1; Whether the duty of current detection circuit detection ratio valve V1 is normal; If the duty of proportioning valve is normal, then export testing result to processor, and by the ventilation flow rate of processor control ratio valve V1; If the duty of proportioning valve occurs unusual, then holding circuit is blocked drive circuit by force, and proportioning valve V1 blocks the air flue loop.
As a further improvement on the present invention, further comprising the steps of: as in drive circuit, to increase deglitch electric capacity; When producing peak current in the drive circuit, described deglitch electric capacity is eliminated described peak current, protection driving tube Q1.
As a further improvement on the present invention, if the duty of described proportioning valve V1 is normal, then export testing result to processor, and further comprising the steps of by this step of ventilation flow rate of processor control ratio valve V1: the flow size of described proportioning valve V1 control air flue pipeline; Flow transducer detects patient airway loop throughput, gives processor with testing result; Described processor sends default digital quantity voltage according to described patient airway loop flow, and is reference voltage by D/A converter module and reference voltage regulating circuit with described digital quantity voltage transitions; Described drive circuit is regulated the aperture of proportioning valve V1 once more according to described reference voltage.
The present invention also provides a kind of Proportion valve controlling circuit, ventilation flow rate to the proportioning valve V1 in the valve interface circuit is controlled, comprise processing and change-over circuit and reference voltage regulating circuit, the digital quantity voltage that this processing and change-over circuit send also is converted into analog quantity voltage, this analog quantity voltage is sent to the reference voltage regulating circuit, is adjusted to reference voltage, also comprises: drive circuit, be connected in described reference voltage regulating circuit, provide reference drive current according to described reference voltage; Holding circuit is connected in described drive circuit, is used for occurring blocking described drive circuit by force unusually when the duty of proportioning valve V1; Current detection circuit is connected in described drive circuit, and described drive current is converted into voltage collection, and described drive current is detected, and the output current testing result is to described processor.
The present invention's beneficial effect compared with prior art is:
When (1) the present invention adopts holding circuit to break down in system, can in time block proportioning valve, improve the safety of equipment;
(2) the present invention effectively controls ventilation flow rate by the dynamic adjustments of holding circuit realization to flow;
(3) the present invention protects driving tube Q1 by spike electric capacity in drive circuit, improves the reliability and the safety of machine.
[description of drawings]
Fig. 1 is the module map of a kind of embodiment of proportional valve control system of the present invention;
Fig. 2 is the flow chart of a kind of embodiment of proportional valve control method of the present invention;
Fig. 3 is the circuit diagram of first kind of embodiment of Proportion valve controlling circuit of the present invention;
Fig. 4 is the circuit diagram of second kind of embodiment of Proportion valve controlling circuit of the present invention;
Fig. 5 is the circuit diagram of the third embodiment of Proportion valve controlling circuit of the present invention;
Fig. 6 is the circuit diagram of Proportion valve controlling circuit prior art of the present invention.
[specific embodiment]
Be described in further detail below in conjunction with accompanying drawing and embodiments of the present invention.
Fig. 1 is the module map of a kind of embodiment of proportional valve control system of the present invention.Present embodiment comprises to be handled and change-over circuit 110, reference voltage regulating circuit 120, drive circuit 130, valve interface circuit 140, current detection circuit 150 and holding circuit 160.Wherein, handle with change-over circuit 110 and comprise processor and D/A converter module; one end of reference voltage regulating circuit 120 is connected in to be handled and change-over circuit 110; the other end is connected in drive circuit 130, and valve interface circuit 140, current detection circuit 150 all are electrically connected with this drive circuit 130 with holding circuit 160.
In addition, this embodiment also comprises air flue pipeline 170 and flow transducer 180.Air flue pipeline 170 connects valve interface circuit 140, and an end of flow transducer 170 is connected in to be handled and change-over circuit 110, and the other end is connected in air flue pipeline 170.
Fig. 2 is the flow chart of a kind of embodiment of proportional valve control method of the present invention.In step S100, processor sends default digital quantity voltage.
In step S102, D/A converter module becomes analog quantity voltage with the digital quantity voltage transitions.
In step S104, reference voltage regulating circuit 120 is adjusted to reference voltage with analog quantity voltage.
In step S106, drive circuit 130 is according to the aperture of reference voltage control ratio valve V1.In the present invention, increased deglitch electric capacity in the drive circuit 130, when producing peak current in the drive circuit 130, deglitch electric capacity is eliminated peak current, protection driving tube Q1.
In step S108, whether the duty of current detection circuit 150 detection ratio valve V1 normal, be specially, current detection circuit 150 according to the flow size of proportioning valve V1 whether normal or flow whether press the rhythm and pace of moving things, judge whether operate as normal of proportioning valve V1.
If the duty of proportioning valve is normal, then export testing result to processor, and by the ventilation flow rate of processor control ratio valve V1.Concrete steps are: in step S110, and the flow size of proportioning valve V1 control air flue pipeline 170; In step S112, flow transducer 180 detects patient airway loop throughput, gives processor with testing result; Reenter among the step S100, processor sends default digital quantity voltage once more.
If the duty of proportioning valve V1 occurs unusual, then enter step S114, holding circuit 160 is blocked drive circuit 130 by force, and proportioning valve V1 blocks the air flue loop, sends warning message.
Wherein, the size of proportioning valve V1 aperture has determined the flow size of air flue pipeline 170, and flow transducer 180 detects patient airway loop throughput, gives processor with the throughput testing result.Whole process is a closed loop, and processor is by predeterminated voltage, and certain flow is exported in control earlier, and drive circuit 130 is regulated the aperture of proportioning valve V1 according to the flow size, and then realizes the accurate control of flow.Current detection circuit 150 is responsible for the duty of detection ratio valve V1, when appearance is unusual, provides warning message.If when taking place unusually, the reference voltage that processor is exported is uncontrollable, and then protection module 160 blocks drive circuit 130 by force, intercepts hardware fault is caused unusual ventilation, guarantees the safety of ventilating.
Fig. 3 is the circuit diagram of first kind of embodiment of Proportion valve controlling circuit of the present invention.In the present embodiment; Proportion valve controlling circuit is controlled the ventilation flow rate of the proportioning valve V1 in the valve interface circuit 140, comprises handling and change-over circuit 110, reference voltage regulating circuit 120, drive circuit 130, holding circuit 160 and current detection circuit 150.Wherein, valve interface circuit 140 comprises driving power+VCC, proportioning valve V1 and inductive load sustained diode 1, and this circuit provides valve interface and afterflow protection.Processing comprises processor and D/A converter module with change-over circuit 110, and processor sends digital quantity voltage, and D/A converter module is an analog quantity voltage with the digital quantity voltage transitions, and holding circuit 160 is controlled.The digital quantity voltage that this processing and change-over circuit 110 send also is converted into analog quantity voltage, and this analog quantity voltage is sent to reference voltage regulating circuit 120, is adjusted to reference voltage, and wherein, reference voltage regulating circuit 120 mainly plays the convergent-divergent effect.
Fig. 4 is the circuit diagram of second kind of embodiment of Proportion valve controlling circuit of the present invention.The difference of present embodiment and first kind of embodiment shown in Figure 2 is, drive circuit 130 comprises operational amplifier U1B, resistance R 4, resistance R 5, resistance R 6, capacitor C 2 and driving tube Q1, also comprise capacitor C 4, capacitor C 4 is a deglitch electric capacity, is connected between the drain electrode and ground of driving tube Q1.Current detection circuit 150 uses the Butterworth filter circuit, and has increased the clamping protection circuit.The control signal of holding circuit 160 is a negative logic signal.
Fig. 5 is the circuit diagram of the third embodiment of Proportion valve controlling circuit of the present invention.The difference of present embodiment and first kind of embodiment shown in Figure 2 is; holding circuit 160 is connected between the source electrode and resistance R 6 of driving tube Q1; the first input control end of its relay K 1 is connected in the source electrode of driving tube Q1; the second input control end is connected in resistance R 6; first outfan is connected in the positive pole of diode D2, and second outfan is connected in the negative pole of diode D2.Capacitor C 3 is connected between the drain electrode and resistance R 7 of described driving tube Q1, and capacitor C 4 is connected between resistance R 7 and the ground.
Proportional valve control method provided by the present invention and circuit thereof; by the dynamic adjustments of holding circuit realization to flow; effectively control ventilation flow rate; and driving tube Q1 is protected by spike electric capacity; improve the reliability and the safety of machine; it is higher to have solved in the prior art shown in Figure 6 driving tube Q1 spoilage, and lacks the problem to the abnormal protection outside the dynamic adjustments that realizes flow.
Above content be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that concrete enforcement of the present invention is confined to these explanations.For the general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, can also make some simple deduction or replace, all should be considered as belonging to protection scope of the present invention.
Claims (10)
1. proportional valve control method, ventilation flow rate to the proportioning valve V1 in the valve interface circuit is controlled, processor sends default digital quantity voltage, D/A converter module becomes analog quantity voltage with described digital quantity voltage transitions, the reference voltage regulating circuit is adjusted to reference voltage with described analog quantity voltage, it is characterized in that, also comprise:
Drive circuit is according to the aperture of described reference voltage control ratio valve V1;
Whether the duty of current detection circuit detection ratio valve V1 is normal;
If the duty of described proportioning valve is normal, then export testing result to processor, and by the ventilation flow rate of processor control ratio valve V1;
If the duty of described proportioning valve V1 occurs unusual, then holding circuit is blocked described drive circuit by force, and described proportioning valve V1 blocks the air flue loop.
2. proportional valve control method according to claim 1 is characterized in that, also comprises the process of drive circuit elimination peak current with protection driving tube Q1.
3. proportional valve control method according to claim 1 is characterized in that, if the duty of described proportioning valve V1 is normal, then exports testing result to processor, and is also comprised by the ventilation flow rate of processor control ratio valve V1:
The flow size in described proportioning valve V1 control air flue loop;
Flow transducer detects air flue loop throughput, gives processor with testing result;
Described processor sends default digital quantity voltage according to described air flue loop flow, and is reference voltage by D/A converter module and reference voltage regulating circuit with described digital quantity voltage transitions;
Described drive circuit is regulated the aperture of proportioning valve V1 once more according to described reference voltage.
4. Proportion valve controlling circuit, ventilation flow rate to the proportioning valve V1 in the valve interface circuit is controlled, comprise processing and change-over circuit and reference voltage regulating circuit, this processing and change-over circuit comprise processor and D/A converter module, described processor sends digital quantity voltage, and described D/A converter module is an analog quantity voltage with described digital quantity voltage transitions, and described reference voltage regulating circuit is used for described analog quantity voltage is adjusted to reference voltage, it is characterized in that, also comprise:
Drive circuit is connected in described reference voltage regulating circuit, provides reference drive current according to described reference voltage;
Holding circuit is connected in described drive circuit, is used for occurring blocking described drive circuit by force unusually when the duty of proportioning valve V1;
Current detection circuit is connected in described drive circuit, and described drive current is converted into voltage collection, and described drive current is detected, and the output current testing result is to described processor.
5. Proportion valve controlling circuit according to claim 4, it is characterized in that: also comprise air flue pipeline and flow transducer, wherein the air flue pipeline is connected in the valve interface circuit, flow transducer one end is connected in the air flue pipeline, the other end is connected in to be handled and change-over circuit, wherein said proportioning valve V1 controls the flow of described air flue pipeline, and flow transducer detects air flue loop throughput, gives described processor with described throughput testing result.
6. Proportion valve controlling circuit according to claim 5, it is characterized in that: described drive circuit comprises operational amplifier U1B, driving tube Q1, resistance R 4, capacitor C 2, resistance R 5 and resistance R 6, wherein, resistance R 5 is connected between the grid of the outfan of described operational amplifier U1B and driving tube Q1, capacitor C 2 is connected between the inverting input and outfan of described operational amplifier U1B, resistance R 4 is connected between the source electrode of the inverting input of described operational amplifier U1B and driving tube Q1, and resistance R 6 is connected between the source electrode and ground of described driving tube Q1; Described current detection circuit comprises operational amplifier U1C, operational amplifier U1D and resistance R 7, wherein, resistance R 7 is connected between the in-phase input end of the source electrode of described driving tube Q1 and operational amplifier U1C, the outfan of described operational amplifier U1C is connected in the in-phase input end of described operational amplifier U1D, the outfan output of described operational amplifier U1D.
7. Proportion valve controlling circuit according to claim 6; it is characterized in that: described holding circuit is connected between described drive circuit and the described valve interface circuit; comprise diode D2 and relay K 1; wherein; the first input control end of described relay K 1 is connected in the drain electrode of described driving tube Q1; the second input control end is connected in described control valve V1, and first outfan is connected in the positive pole of described diode D2, and second outfan is connected in the negative pole of described diode D2.
8. Proportion valve controlling circuit according to claim 7, it is characterized in that: described drive circuit also comprises capacitor C 3 and capacitor C 4, described capacitor C 3 is deglitch electric capacity with capacitor C 4, described capacitor C 3 is connected between the drain electrode and grid of described driving tube Q1, and described capacitor C 4 is connected between the grid and ground of described driving tube Q1.
9. Proportion valve controlling circuit according to claim 7 is characterized in that: described drive circuit also comprises capacitor C 4, and described capacitor C 4 is a deglitch electric capacity, is connected between the drain electrode and ground of described driving tube Q1.
10. Proportion valve controlling circuit according to claim 6, it is characterized in that: described holding circuit is connected between the source electrode and resistance R 6 of described driving tube Q1, comprise diode D2 and relay K 1, wherein, the first input control end of described relay K 1 is connected in the source electrode of described driving tube Q1, the second input control end is connected in an end of described resistance R 6, the other end of R6 is connected in ground, first outfan is connected in the positive pole of described diode D2, and second outfan is connected in the negative pole of described diode D2; Described drive circuit also comprises capacitor C 3 and capacitor C 4, and described capacitor C 3 is deglitch electric capacity with capacitor C 4, and capacitor C 3 is connected between the drain electrode and resistance R 7 of described driving tube Q1, and capacitor C 4 is connected between resistance R 7 and the ground; Described resistance R 6 one ends are connected in the source electrode of described driving tube Q1; Described resistance R 7 is connected between the in-phase input end of capacitor C 4 and U1C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101030928A CN101785896B (en) | 2010-01-26 | 2010-01-26 | Proportional valve control method and circuit thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101030928A CN101785896B (en) | 2010-01-26 | 2010-01-26 | Proportional valve control method and circuit thereof |
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| CN101785896A CN101785896A (en) | 2010-07-28 |
| CN101785896B true CN101785896B (en) | 2011-11-02 |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104707228B (en) * | 2015-03-02 | 2017-05-17 | 深圳市科曼医疗设备有限公司 | Transnasal high-flow-capacity oxygen therapy pressure monitoring system and method |
| CN106693129B (en) * | 2015-07-14 | 2019-09-17 | 北京谊安医疗***股份有限公司 | A kind of closed-loop capacity control method of ventilator |
| CN105997468B (en) * | 2016-04-29 | 2017-12-05 | 广州龙之杰科技有限公司 | A kind of pulsed ESW wave device for the treatment of bone Muscular diseases |
| CN110237374B (en) * | 2019-05-22 | 2022-03-08 | 东南大学 | Device for generating given inspiratory waveform and using method thereof |
| CN113058108A (en) * | 2021-03-11 | 2021-07-02 | 深圳圣诺医疗设备股份有限公司 | Constant-current driving control device, system and method for constant-voltage infusion electromagnetic valve |
| CN114111931A (en) * | 2021-12-09 | 2022-03-01 | 长沙锐逸微电子有限公司 | Airflow sensing driving chip for realizing analog quantity output |
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Denomination of invention: Proportional valve control method and circuit thereof Effective date of registration: 20191212 Granted publication date: 20111102 Pledgee: Agricultural Bank of China Limited Qianhai branch Pledgor: Shenzhen Poople Science and Technology Co., Ltd. Registration number: Y2019440020035 |
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Address after: 518000 Area A, 9th floor, 6th floor, Building C, 71-3 Xintian Avenue, Fuyong Street, Baoan District, Shenzhen City, Guangdong Province Patentee after: SHENZHEN PROBE SCIENCE & TECHNOLOGY Co.,Ltd. Address before: Shenzhen City, Nanshan District 518000, Guangdong Province along the road No. 37 Building No. 3 2A/2B jinlimei Patentee before: SHENZHEN PROBE SCIENCE & TECHNOLOGY Co.,Ltd. |
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Address after: 518000 area a, 6th floor, 9th floor, building C, 71-3 Xintian Avenue, Fuyong street, Bao'an District, Shenzhen City, Guangdong Province Patentee after: Shenzhen Pubo Medical Technology Co.,Ltd. Address before: 518000 area a, 6th floor, 9th floor, building C, 71-3 Xintian Avenue, Fuyong street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN PROBE SCIENCE & TECHNOLOGY Co.,Ltd. |
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