CN103899559B - A kind of high-performance respiratory machine Turbine controller - Google Patents
A kind of high-performance respiratory machine Turbine controller Download PDFInfo
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- CN103899559B CN103899559B CN201210581107.0A CN201210581107A CN103899559B CN 103899559 B CN103899559 B CN 103899559B CN 201210581107 A CN201210581107 A CN 201210581107A CN 103899559 B CN103899559 B CN 103899559B
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Abstract
The invention discloses a kind of Turbine controller and controlling method thereof of respiratory machine, this Turbine controller comprises: upper control part, field control part and power management module; Wherein, upper control part comprises: host computer, D/A converter D/A module, Signal-regulated kinase, voltage/frequency conversion V/F module and power module; Field control part comprises: These field control modules, turbine drives module, turbine current detection module, secondary speed testing module; Power management module comprises core circuit power module and power power-supply module.The present invention can obtain following technique effect: adopt V/F technology to realize the conversion of rotating speed control voltage-drive circuit incoming frequency, portable good; Adopt hall device sampling turbine electric current, precision is high, good reliability; The multiple working state of running state lamp display turbine, the working state that different status lamp displays is corresponding different is succinctly clear.
Description
Technical field
The present invention relates to a kind of respiratory machine turbine, particularly relate to a kind of respiratory machine Turbine controller and controlling method thereof.
Background technique
Respiratory machine is that a kind of normal physiological that can replace, control or change people is breathed, increase pulmonary ventilation volume, improve respiratory function, alleviate work of breathing consumption, save the device of heart reservation ability, obtained in first aid, anesthesia, ICU and respiratory therapy field and applied more and more widely.Due to turbine have that cost is low, volume is little, efficient, be easy to the advantages such as control, adopt turbine more and more to obtain the attention of medical equipment industry as the respiratory machine of source of the gas.General, the turbine portion of respiratory machine comprises turbine, Turbine controller, air-capacitor and denoising device etc.Wherein, the performance of Turbine controller directly affects the complete machine index of respiratory machine.At present, at least there are the following problems as the respiratory machine of source of the gas power to adopt turbine: (1) Turbine controller, mostly from purchasing, has the unfavorable factors such as cost of transportation is high, lead time is long, breakdown maintenance is difficult abroad; (2) Turbine controller bought mostly is integral seal structure, and mechanical dimension can not adjust, and space layout needs do specific consideration; (3) electrically input/output interface kind is few, compares and is difficult to and other Matching components, realize data sharing.Therefore, design and a kind ofly meet domestic respiratory machine product demand, expand turbine drives succinct, with low cost there is very important market value.
Summary of the invention
In order to overcome the above-mentioned shortcoming that prior art exists, the invention provides a kind of Turbine controller, this Turbine controller comprises: upper control part, field control part and power management module, wherein, upper control part comprises: host computer, D/A converter D/A module, Signal-regulated kinase, voltage/frequency conversion V/F module and power module, field control part comprises: These field control modules, turbine drives module, turbine current detection module, secondary speed testing module, power management module comprises core circuit power module and power power-supply module, in upper control part, host computer has control and data-interface, for the control command that input control turbine runs, and receive the data relevant to turbine running state from field control part, the control command that host computer exports becomes analogue signal by D/A converter D/A module converts, become the signal of voltage signal after D/A converter D/A module converts controlling secondary speed and be input to Signal-regulated kinase, after direct current biasing and filtering carry out signal condition, voltage/frequency conversion V/F module is input in signal condition mould, analog voltage signal is transformed to frequency signal by voltage/frequency conversion V/F module, convert the frequency signal obtained and be sent to These field control modules to control the operation of turbine, at the scene in control section, These field control modules receives the frequency signal that obtains through voltage/frequency conversion V/F block transforms and processes the frequency signal received, and treated frequency signal is sent to turbine drives module, drives turbo driving, turbine drives module is for driving turbo driving, turbine current detection module for detecting electric current during turbo driving, and sends the electric current detected to These field control modules after analog/digital conversion A/D conversion, secondary speed testing module for detecting the rotating speed of turbine, and sends the tach signal detected to These field control modules after level conversion, core circuit power module in power management module is used for providing power supply to host computer and These field control modules, and the power power-supply module in power management module is used for driving turbo driving.
Present invention also offers turbine control method, it is characterized in that comprising the steps: that host computer sends a secondary speed control command, analogue signal is transformed into after D/A switch, become the voltage signal controlling secondary speed, signal after D/A switch is after direct current biasing and filtering carry out carrying out voltage/frequency conversion after signal condition, analog voltage signal is transformed to frequency signal, converts the operation that the frequency signal obtained is used to control turbine.
The present invention can obtain following technique effect: adopt V/F technology to realize the conversion of rotating speed control voltage-drive circuit incoming frequency, portable good; Adopt hall device sampling turbine electric current, precision is high, good reliability; The multiple working state of running state lamp display turbine, the working state that different status lamp displays is corresponding different is succinctly clear.
Accompanying drawing explanation
Fig. 1 is Turbine controller block diagram of the present invention;
Fig. 2 is the structural drawing of the These field control modules of Turbine controller of the present invention;
The control flow block diagram of the These field control modules of Fig. 3 Turbine controller;
Fig. 4 is V/F chip AD650 configuration circuit of the present invention;
Fig. 5 is turbine current sample chip ACS714 of the present invention;
Fig. 6 is turbine drives circuit of the present invention.
Fig. 7 is the analog amount mathematical model of electric current loop of the present invention;
Fig. 8 is the simplification mathematical model of electric current loop of the present invention after ignoring back-emf impact;
Fig. 9 is the mathematical model after electric current loop of the present invention adopts digital circuit;
Figure 10 is the mathematical model of speed ring of the present invention;
Figure 11 is that electric current loop to be set to a gain be after the proportional component of 1, the simplified model of speed ring.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, illustrate only part related to the present invention in accompanying drawing but not entire infrastructure.
Fig. 1 is Turbine controller block diagram of the present invention.As shown in Figure 1, Turbine controller of the present invention comprises upper control part, field control part and power management module, and wherein upper control part comprises: host computer, D/A converter D/A module, Signal-regulated kinase, voltage/frequency conversion V/F module and power module; Field control part comprises: These field control modules, turbine drives module, turbine current detection module, secondary speed testing module; Power management module comprises core circuit power module and power power-supply module.In upper control part, host computer (representing with CPU in Fig. 1), there is control and data-interface, for the control command that input control turbine runs, and receive the data relevant to turbine running state from field control part, the control command that host computer exports becomes analogue signal by D/A converter D/A module converts, become the voltage signal controlling secondary speed, signal after D/A converter D/A module converts is input to Signal-regulated kinase, after direct current biasing and filtering carry out signal condition, voltage/frequency conversion V/F module is input in signal condition mould, analog voltage signal is transformed to frequency signal by voltage/frequency conversion V/F module, convert the frequency signal obtained and be sent to These field control modules to control the operation of turbine.At the scene in control section, These field control modules (representing with FPGA in Fig. 1) receives the frequency signal that obtains through voltage/frequency conversion V/F block transforms and processes the frequency signal received, treated frequency signal is sent to turbine drives module, drives turbo driving; Turbine drives module is for driving turbo driving; Turbine current detection module for detecting electric current during turbo driving, and sends the electric current detected to These field control modules after analog/digital conversion A/D conversion; Secondary speed testing module for detecting the rotating speed of turbine, and sends the tach signal detected to These field control modules after level conversion.Core circuit power module in power management module is used for providing power supply to host computer and These field control modules, and the power power-supply module in power management module is used for driving turbo driving.
Preferably, send turbine drives module again to after the data that These field control modules sends can cushions in data buffering module, it sends to the data of host computer can be the electric current of turbine, the rotating speed of turbine, other parameter of turbine operation.
Preferably, upper control part and field control part can be integrally manufactured, also can separately manufacture.Design and installation Turbine controller can be carried out like this according to the actual demand at scene.
Preferably, the running state of turbine is shown by running state lamp by on-site data processing module, can know the running state of turbine so in real time, dynamically, once break down, can carry out searching and keeping in repair of equipment failure targetedly.
Preferably, core circuit power module in power management module can be respectively used to provide the power supply of host computer and be supplied to the power supply of These field control modules, namely the power supply of host computer, These field control modules can be separate, can use power supply neatly according to the actual needs like this.
Present invention also offers a kind of turbine control method, it comprises the steps: that host computer sends a secondary speed control command, analogue signal is transformed into after D/A switch, become the voltage signal controlling secondary speed, signal after D/A switch is after direct current biasing and filtering carry out carrying out voltage/frequency conversion after signal condition, analog voltage signal is transformed to frequency signal, converts the operation that the frequency signal obtained is used to control turbine.Further, convert the frequency signal obtained and be sent to turbine drives module, drive turbine to run; Turbine current detection module for detecting electric current during turbo driving, and sends the electric current detected to These field control modules after analog/digital conversion A/D conversion; Secondary speed testing module for detecting the rotating speed of turbine, and sends the tach signal detected to These field control modules after level conversion.Further, by the running state of running state lamp display turbine.
Preferably, These field control modules of the present invention adopts control structure as shown in Figure 2.These field control modules comprises CPU communication interface module, Parasites Fauna, currrent feedback module, current regulator, speed regulator, position regulator, pulse-width modulation circuit and state machine, wherein CPU communication interface module is used for carrying out communication with upper-position unit, receive the frequency signal from voltage/frequency conversion V/F module, and send the status data relevant to the running of turbine to upper-position unit, the frequency signal received is sent to Parasites Fauna by CPU communication interface module, in the register bank after buffering, deliver to current regulator, current regulator is according to the feedback current detecting secondary speed and the turbine obtained, regulated signal is delivered to pulse-width modulation circuit, pulse width modulation circuit exports 6 road pulse-width signals for controlling the rotating speed of turbine, received current feedback signal is gone back in Parasites Fauna, and the frequency signal that will receive, fed-back current signals delivers to speed regulator and position regulator, under the control of state machine, position regulator is outputed signal is sent to speed regulator.
Fig. 3 shows the control flow block diagram of the These field control modules of Turbine controller of the present invention.As shown in Figure 3, when timer interruption counts, turn off pulse-modulated signal juxtaposition guard lamp, if timer does not interrupt counting, then judge whether to there is protective signal further, if judged result is "No", then turn off pulse-modulated signal, if judged result is "Yes", then judge whether to there is enable signal further, if there is enable signal, then by the accumulative process of external pulse number, consult Sin (x) table pre-set in These field control modules, obtain the setting electric current of two-phase difference 120 degree, read current sampling data Ia and Ib and carry out filtering process, vector U is obtained again by stagnant ring algorithm, the interval at compute vectors U place, converted by the coordinate conversion matrix preset, calculate the value of comparator and send in corresponding comparator.
In one embodiment of the invention, the interface of host computer and external equipment can be serial ports, CAN, or I2C bus, be convenient to expansion, also can by media such as networks further by data transmission with use for further analysis.The power supply of the CPU of host computer can be: 3.3V, or 1.9V, and working frequency of chip is 150MHz.
In one embodiment of the invention, voltage/frequency conversion V/F module is highi degree of accuracy, high-frequency type single-chip integration electric voltage frequency (V/F) conversion circuit, and frequency of okperation is high, has low-down nonlinearity.Voltage/frequency conversion V/F module can select AD650 as shown in Figure 4, and the V/F of this chip converts frequency of okperation and can reach 1MHz, and when full scale output frequency is 10KHz, nonlinearity representative value is 0.002%.
Turbine current detection module adopts accurate low biased linear hall sensor circuit, and be preferably ACS714 chip as shown in Figure 5, this chip current path made of copper is near the surface of wafer.The electric current applied by this copper current path can be generated can be responded to by Integrated Hall IC and be converted into the magnetic field of proportional voltage.By by magnetic signal near Hall transducer, realize the optimization of device validity.When the electric current of the main copper current path (from pin 1 and 2, to 3 and 4) by being used as current sense path constantly rises, the output of device has positive slope (>VIOUT (Q)).The interior resistance normally 1.2m Ω of this conduction path, has lower power consumption.The terminal of conduction path and sensor pin (pin 5 to 8) electric insulation.
In one embodiment of the invention, running state lamp can the working state of display drive signals and hall signal, turbine start and stop and clockwise and anticlockwise, the functions such as current protection.By the lamp of different colours and the different work state information of the frequency representation of flicker, be convenient to searching and keeping in repair of fault.
In one embodiment of the invention, as shown in Figure 6, turbine drives module is a three-phase inverter.This three-phase inverter can form primarily of three groups of power driver module IR2132 and IRF540N, often organize the phase in power driver module connection turbine three-phase voltage, each group power driver module comprises two amplifiers and two diodes, wherein the collector electrode of each amplifier is connected with the low side of one of them diode, and its emitter is connected with the high-end of this diode, and the collector electrode of an amplifier in two amplifiers of each group power driver module is connected with the emitter of another amplifier, in turbine three-phase voltage one is connected at the tie point place of two amplifiers, the pulse width modulating signal PWM produced by These field control modules inputs the base stage of each amplifier respectively, such power driver module IR2132 achieves the amplification of signal, drive three-phase inverter.
Set forth the foundation of electric current loop mathematical model and speed ring model in the present invention below further.
Can estimate that the scope of digital adjuster gain is to determine computing word length and algorithm, therefore only considers the simplest situation by setting up an electric current loop mathematical model; Experimentally situation is needed to adjust during actual debugging.Do not consider tube voltage drop, then the analog amount mathematical model of electric current loop as shown in Figure 7.
Because electromechanical time constant is more much larger than electromagnetic time constant, so the impact of back-emf can be ignored, and it is regarded as load disturbance.The analog amount mathematical model of the electric current loop now shown in Fig. 7 can be reduced to the simplification mathematical model of electric current loop after ignoring back-emf impact as shown in Figure 8.
Notice that the PI in figure is simulation proportional+integral regulator, each variable is all analog amount.
After adopting digital circuit, the corresponding mathematical model electric current loop become as shown in Figure 9 adopts the mathematical model after digital circuit.
Adoption rate adds integral controller, namely
Now open loop transfer function is
Wherein,
Set forth the foundation of speed ring mathematical model below.If the sample frequency of speed ring is 10kHz.Speed ring bandwidth is 100Hz, because electric current loop bandwidth is far above speed ring, therefore can ignore the impact of current inner loop, as shown in Figure 10.
Wherein electric current loop is obtained by design above, is a single order link; Consider that designed electric current loop bandwidth is much larger than position ring and speed ring, think that electric current loop be a gain is the proportional component of 1, like this, just has model as described in Figure 11 so can be similar to:
According to the PID structure that actual choose targets is suitable, system compensation is become best link.
It should be noted that, above are only preferred embodiment of the present invention and institute's application technology principle, can mutually combine between above-mentioned multiple embodiment of the present invention.The operable chip model of the modules of following table cited by the present invention, certainly, those skilled in the art can understand the present invention and be not limited to these chips, as long as can realize the circuit structure of these chip identical functions.
Table 1 function module and chip model
Function module | Chip model |
CPU | DSP28335PGF |
D/A | AD5625RBRUZ-2 |
Signal condition | LM258D |
V/F | AD650AD |
FPGA | XC3S200-4PQ208I |
Data buffering | SN74LVC245ADWR |
Electric circuit inspection | ACS714ELCTR-05B-T |
Current detecting A/D | AD7927BRU |
Level conversion | HD74LVC4245A |
Power drive | IR2132 |
Further, person of skill in the art will appreciate that, the invention is not restricted to specific embodiment described here, various obvious change can be carried out for a person skilled in the art, readjust and substitute and can not protection scope of the present invention be departed from.Therefore, although be described in further detail invention has been by above embodiment, the present invention is not limited only to above embodiment, when not departing from the present invention's design, can also comprise other Equivalent embodiments more, and scope of the present invention is determined by appended right.
Claims (13)
1. a Turbine controller, is characterized in that comprising: upper control part, field control part and power management module; Wherein, upper control part comprises: host computer, D/A converter D/A module, Signal-regulated kinase, voltage/frequency conversion V/F module and power module; Field control part comprises: These field control modules, turbine drives module, turbine current detection module, secondary speed testing module; Power management module comprises core circuit power module and power power-supply module;
In upper control part, host computer has control and data-interface, for the control command that input control turbine runs, and receive the data relevant to turbine running state from field control part, the control command that host computer exports becomes analogue signal by D/A converter D/A module converts, become the signal of voltage signal after D/A converter D/A module converts controlling secondary speed and be input to Signal-regulated kinase, after direct current biasing and filtering carry out signal condition, voltage/frequency conversion V/F module is input in signal condition mould, analog voltage signal is transformed to frequency signal by voltage/frequency conversion V/F module, convert the frequency signal obtained and be sent to These field control modules to control the operation of turbine,
At the scene in control section, These field control modules receives the frequency signal that obtains through voltage/frequency conversion V/F block transforms and processes the frequency signal received, and treated frequency signal is sent to turbine drives module, drives turbo driving; Turbine drives module is for driving turbo driving; Turbine current detection module for detecting electric current during turbo driving, and sends the electric current detected to These field control modules after analog/digital conversion A/D conversion; Secondary speed testing module for detecting the rotating speed of turbine, and sends the tach signal detected to These field control modules after level conversion;
Core circuit power module in power management module is used for providing power supply to host computer and These field control modules, and the power power-supply module in power management module is used for driving turbo driving.
2. Turbine controller as claimed in claim 1, it is characterized in that, send turbine drives module again to after the data that These field control modules sends can cushion in data buffering module, These field control modules sends to the data of host computer to be other parameter that the electric current of turbine, the rotating speed of turbine and/or turbine run.
3. Turbine controller as claimed in claim 1, it is characterized in that, These field control modules comprises CPU communication interface module, Parasites Fauna, currrent feedback module, current regulator, speed regulator, position regulator, pulse-width modulation circuit and state machine; Wherein,
CPU communication interface module is used for carrying out communication with upper-position unit, receive the frequency signal from voltage/frequency conversion V/F module, and send the status data relevant to the running of turbine to upper-position unit, the frequency signal received is sent to Parasites Fauna by CPU communication interface module, in the register bank after buffering, deliver to current regulator, current regulator is according to the feedback current detecting secondary speed and the turbine obtained, regulated signal is delivered to pulse-width modulation circuit, pulse width modulation circuit exports 6 road pulse-width signals for controlling the rotating speed of turbine, received current feedback signal is gone back in Parasites Fauna, and the frequency signal that will receive, fed-back current signals delivers to speed regulator and position regulator, under the control of state machine, position regulator is outputed signal is sent to speed regulator.
4. Turbine controller as claimed in claim 1, it is characterized in that, upper control part and field control part can be integrally manufactured, also can separately manufacture.
5. Turbine controller as claimed in claim 1, it is characterized in that, the running state of turbine is shown by running state lamp by These field control modules.
6. Turbine controller as claimed in claim 1, it is characterized in that, core circuit power module in power management module provides the power supply of host computer respectively and is supplied to These field control modules power supply, and namely the power supply of host computer, on-site data processing module is separate.
7. Turbine controller as claimed in claim 1, is characterized in that, the V/F conversion frequency of okperation that voltage/frequency changes V/F module is 1MHz, and full scale output frequency is 10KHz non-linear hour degree is 0.002%.
8. Turbine controller as claimed in claim 1, is characterized in that, turbine current detection module adopts Hall transducer circuit.
9. Turbine controller as claimed in claim 1, it is characterized in that, turbine drives module is a three-phase inverter.
10. a turbine control method, it is characterized in that comprising the steps: that host computer sends a secondary speed control command, analogue signal is transformed into after D/A switch, become the voltage signal controlling secondary speed, signal after D/A switch is after direct current biasing and filtering carry out carrying out voltage/frequency conversion after signal condition, analog voltage signal is transformed to frequency signal, converts the operation that the frequency signal obtained is used to control turbine;
The control of These field control modules comprises the steps: when timer interruption counts, turn off pulse-modulated signal juxtaposition guard lamp, if timer does not interrupt counting, then judge whether to there is protective signal further, if judged result is "No", then turn off pulse-modulated signal, if judged result is "Yes", then judge whether to there is enable signal further, if there is enable signal, then by the accumulative process of external pulse number, consult Sin (x) table pre-set in These field control modules, obtain the setting electric current of two-phase difference 120 degree, read current sampling data Ia and Ib and carry out filtering process, vector U is obtained again by stagnant ring algorithm, the interval at compute vectors U place, converted by the coordinate conversion matrix preset, calculate the value of comparator and send in corresponding comparator.
11. turbine control method as claimed in claim 10, is characterized in that, convert the frequency signal obtained and are sent to turbine drives module, drive turbine to run; Turbine current detection module for detecting electric current during turbo driving, and sends the electric current detected to These field control modules after analog/digital conversion A/D conversion; Secondary speed testing module for detecting the rotating speed of turbine, and sends the tach signal detected to These field control modules after level conversion.
12. turbine control method as claimed in claim 10, is characterized in that, by the running state of running state lamp display turbine.
13. turbine control method as claimed in claim 11, is characterized in that, by the running state of running state lamp display turbine.
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CN113342080B (en) * | 2021-06-20 | 2022-06-28 | 三河科达实业有限公司 | Breathing module turbine variable speed control method of portable universal life support system |
CN117073748A (en) * | 2023-07-19 | 2023-11-17 | 哈尔滨工业大学 | Measuring method for micro turbine external VT of small flow respirator |
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