CN105391368A - System for measuring position of treatment head diaphragm of linear accelerator - Google Patents
System for measuring position of treatment head diaphragm of linear accelerator Download PDFInfo
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- CN105391368A CN105391368A CN201510676032.8A CN201510676032A CN105391368A CN 105391368 A CN105391368 A CN 105391368A CN 201510676032 A CN201510676032 A CN 201510676032A CN 105391368 A CN105391368 A CN 105391368A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 238000012545 processing Methods 0.000 claims abstract description 7
- 230000011664 signaling Effects 0.000 claims description 22
- 238000005259 measurement Methods 0.000 claims description 21
- 238000001514 detection method Methods 0.000 claims description 17
- 230000001052 transient effect Effects 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 10
- 230000003321 amplification Effects 0.000 claims description 8
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- 230000001684 chronic effect Effects 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
- H02P23/14—Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N5/1001—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy using radiation sources introduced into or applied onto the body; brachytherapy
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61N—ELECTROTHERAPY; MAGNETOTHERAPY; RADIATION THERAPY; ULTRASOUND THERAPY
- A61N5/00—Radiation therapy
- A61N5/10—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy
- A61N2005/1085—X-ray therapy; Gamma-ray therapy; Particle-irradiation therapy characterised by the type of particles applied to the patient
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- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
- Public Health (AREA)
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- Transmission And Conversion Of Sensor Element Output (AREA)
- Radiation-Therapy Devices (AREA)
Abstract
The invention provides a system for measuring a position of a treatment head diaphragm of a linear accelerator. The system comprises a rotary transformer, an excitation circuit, a signal conversion circuit and a field-programmable gate array (FPGA). One rotary transformer corresponds with one treatment head diaphragm. The excitation circuit converts an excitation digital signal which is output from the FPGA to an excitation simulation signal and transmitting the excitation simulation signal to the rotary transformer, wherein the excitation simulation signal is used for performing excitation on the rotary transformer. The rotary transformer is used for working in response to excitation of the excitation circuit, measuring a rotation angle of a rotor of the motor which drives the treatment head diaphragm and outputting a sine analog signal and a cosine analog signal, wherein the sine analog signal and the cosine analog signal are orthogonal with each other. The signal conversion circuit is used for converting the sine analog signal and the cosine analog signal to a digital signal and transmitting the digital signal to the FPGA. The FPGA is used for processing the digital signal for obtaining the rotation angle of the rotor of the motor. The position of the motor rotor is measured by means of the rotary transformer. The rotary transformer does not contain any chip and has high resistance for long-term X-ray radiation, and therefore the rotary transformer has relatively high reliability.
Description
Technical field
The present invention relates to technical field of medical instruments, particularly a kind of system measuring linear accelerator treatment head stop position.
Background technology
The treatment head diaphragm of medical electron linear accelerator drives it to move by motor, and Electric Machine Control treats the open and close of head diaphragm thus the output dose of control X ray.Therefore, in order to accurately control the motion for the treatment of head diaphragm, needing the rotor-position detecting motor in real time, thus obtaining the particular location for the treatment of head diaphragm.
In prior art, because the data processing circuit of encoder is fairly simple, and easily realize high-resolution, output signal also smoother.Therefore, utilize the measurement of encoder realization to the rotor-position of motor, realize the Position Control to treatment head diaphragm.Treatment head diaphragm comprises four pieces, and every block diaphragm correspondence arranges an encoder, arranges four encoders altogether.
Medical electron linear accelerator is different from the occasion that other use encoder, and because decoder internal is integrated with chip, the x-ray dose that linear accelerator uses is larger, and signal disturbing is more severe.Chip in encoder easily damages for a long time under the radiation of X ray.
Therefore, those skilled in the art need to provide a kind of system measuring linear accelerator treatment head stop position, can measure the position of linear accelerator treatment head diaphragm, can meet again can not be damaged under the irradiation of heavy dose of X ray simultaneously, ensures the reliability of system.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of system measuring linear accelerator treatment head stop position, the position of the treatment head diaphragm of linear accelerator can be measured, can meet again can not be damaged under the irradiation of heavy dose of X ray simultaneously, ensures the reliability of system.
The embodiment of the present invention provides a kind of system measuring linear accelerator treatment head stop position, comprising: resolver, field circuit, signaling conversion circuit and FPGA;
A corresponding one piece for the treatment of head diaphragm of described resolver;
Described field circuit, the excitation digital signal for being exported by described FPGA is converted to excitation analog signal and sends to described resolver, and described excitation analog signal is used for carrying out excitation to described resolver;
Described resolver, for working under the excitation of described field circuit, measuring the corner of the rotor of the motor driving described treatment head diaphragm, exporting mutually orthogonal sinusoidal analog signal and cosine analog signal;
Described signaling conversion circuit, sends to described FPGA for described sinusoidal analog signal and cosine analog signal are converted to digital signal;
Described FPGA, for carrying out the corner processing the rotor obtaining described motor to described digital signal.
Preferably, also comprise: amplifying circuit and low-pass filter circuit;
Described amplifying circuit and low-pass filter circuit are connected between described resolver and described signaling conversion circuit;
Described amplifying circuit, amplifies for the mutually orthogonal sinusoidal analog signal that exported by described resolver and cosine analog signal;
Described low-pass filter circuit, the mutually orthogonal sinusoidal analog signal after amplifying for filtering and the high order harmonic component in cosine analog signal.
Preferably, described amplifying circuit comprises: the first resistance, the second resistance, the first electric capacity and the first amplifier;
The first input end of described first amplifier connects described sinusoidal analog signal or the cosine analog signal of the output of described resolver by described first resistance;
The first input end of described first amplifier connects the output of the first amplifier by described second resistance, described first Capacitance parallel connection is at the two ends of described second resistance;
Second input of described first amplifier connects reference power source;
The output of described first amplifier connects the input of described low-pass filter circuit.
Preferably, also comprise: drive circuit;
Described drive circuit is connected between described resolver and described field circuit;
Described drive circuit, sends to described resolver after the excitation analog signal for being exported by described field circuit carries out amplification filtering.
Preferably, also comprise: voltage follow-up amplifier and push-pull power amplifier;
The input of described voltage follow-up amplifier connects the output of described drive circuit, the excitation analog signal for described drive circuit is exported carry out buffer compartment from;
Described push-pull power amplifier, the excitation analog signal for exporting described voltage follow-up amplifier carries out the amplification process of positive half cycle and negative half period.
Preferably, also comprise: ferroelectric memory;
Described FPGA, also for the corner of the rotor when described motor more than 360 degree time, to the corner of described rotor to rotor the number of turns that turns add up, the described number of turns is stored in described ferroelectric memory, when powering at every turn, read the number of turns stored in described ferroelectric memory and continue accumulative.
Preferably, also comprise: first interface circuit and the second interface circuit;
Described first interface circuit is connected between described resolver and described signaling conversion circuit;
Described first interface circuit, the sinusoidal analog signal that the two-phase for being exported by described resolver is orthogonal and cosine analog signal are all converted to differential signal and export to described signaling conversion circuit;
Described second interface circuit is connected between described FPGA and host computer;
Described second interface circuit, the data for described FPGA being uploaded to described host computer are converted to differential signal transmission to described host computer.
Preferably, described second interface circuit also comprises: three transient voltage suppressor;
A described transient voltage suppressor is connected between two differential signal transmission of described second interface circuit;
A described transient voltage suppressor is connected between differential signal transmission with ground described in every root.
Preferably, also power-fail detection circuit is comprised;
Described power-fail detection circuit, for the supply voltage of detection system, when the supply voltage power down of system being detected, then sends power-off signal to described FPGA;
Described FPGA, for stopping the digital signal receiving the transmission of described signaling conversion circuit after receiving described power-off signal.
Preferably, described drive circuit comprises: the 3rd amplifier, the 6th resistance, the 7th resistance and the 4th electric capacity;
The first input end of described 3rd amplifier connects the excitation analog signal of field circuit output by described 6th resistance;
The first input end of described 3rd amplifier connects the output of the 3rd amplifier by the 7th resistance;
4th Capacitance parallel connection is at the two ends of described 7th resistance.
Compared with prior art, the present invention has the following advantages:
The system that the present embodiment provides, utilizes resolver to measure the rotor-position of the motor driving treatment head diaphragm.The structure of resolver is stator, rotor and coil, does not comprise any chip, because stator, rotor and coil can stand the chronic exposure of heavy dose of X ray, can not by the interference of X ray, and useful life is long, and Reliability comparotive is high.This system utilizes FPGA realize the excitation con-trol of resolver and carry out to the analog signal that resolver exports the corner that analyzing and processing obtains rotor simultaneously.This system adopts modularized design mode, and structure is simple, and cost is lower.And in prior art, utilizing encoder to carry out the detection of rotor-position, the chip in encoder easily damages by the radiation of X ray, and Reliability comparotive is poor.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is system embodiment one schematic diagram of measurement linear accelerator provided by the invention treatment head stop position;
Fig. 2 is system embodiment two schematic diagram of measurement linear accelerator provided by the invention treatment head stop position;
Fig. 3 is amplifying circuit provided by the invention and low-pass filter circuit schematic diagram;
Fig. 4 is system embodiment three schematic diagram of measurement linear accelerator provided by the invention treatment head stop position;
Fig. 5 is the circuit diagram of drive circuit voltage follow-up amplifier provided by the invention and push-pull power amplifier;
Fig. 6 is system embodiment four schematic diagram of measurement linear accelerator provided by the invention treatment head stop position;
Fig. 7 is power-fail detection circuit schematic diagram provided by the invention;
Fig. 8 is the scheme of installation of resolver provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
For enabling above-mentioned purpose of the present invention, feature and advantage become apparent more, are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
System embodiment one:
See Fig. 1, this figure is system embodiment one schematic diagram of measurement linear accelerator provided by the invention treatment head stop position.
The system of the measurement linear accelerator treatment head stop position that the present embodiment provides, comprise: resolver 100, field circuit 200, signaling conversion circuit 300 and field programmable gate array (FPGA, Field-ProgrammableGateArray) 400;
A corresponding one piece for the treatment of head diaphragm of described resolver 100;
At present, the treatment head diaphragm of linear accelerator comprises four pieces, and four pieces of described treatment head diaphragms are uniformly distributed relative to the central point for the treatment of head; The size of the opening for the treatment of head diaphragm determines the size of X ray output dose.Every block treatment head diaphragm drives it to move by independent motor.The position of the rotor of a motor measured by a resolver.Therefore, described resolver 100 comprises four, the corresponding one piece of described treatment head diaphragm of each resolver 100.
It should be noted that, can there is the change on X1, X2, Y1 and Y2 position in four pieces for the treatment of head diaphragms, namely carry out open and close reciprocating motion.Wherein X1 and X2 represents the positive axis of X-axis and negative semiaxis, Y1 and Y2 represents the positive axis of Y-axis and negative semiaxis.Therefore four resolvers also distribute according to the position for the treatment of head diaphragm, can detect the movement position for the treatment of head diaphragm.
Described field circuit 200, the excitation digital signal for being exported by described FPGA is converted to excitation analog signal and sends to described resolver 100, and described excitation analog signal is used for carrying out excitation to described resolver 100;
It should be noted that, resolver 100 is a kind of special checkout gears, therefore needs excitation signal input driving circuit to carry out driving (work) during its work
Described resolver 100, for working under the excitation of described field circuit, measuring the rotor-position of the motor driving treatment head diaphragm, exporting mutually orthogonal sinusoidal analog signal and cosine analog signal;
Resolver abbreviation revolves change (resolver), and its output voltage becomes the specific type of electric machine of certain functional relation with the corner of rotor, and its first side winding and secondary side winding are all arranged on stator.Electromagnetic coupled degree between first side winding and secondary side winding and the corner of rotor closely related.Resolver is a rotatable transformer.The rotation of rotor changes magnetic resistance, thus changes the signal of telecommunication relation of constrained input.The output signal of resolver is the orthogonal sinusoidal analog signal of two-phase and cosine analog signal, and the amplitude of analog signal does sine and cosine change along with the corner of rotor, and frequency is consistent with excitation frequency.
The external world is needed to provide excitation for it when resolver 100 works.
It should be noted that, what resolver 100 detected is the absolute position of 360 degree of angle internal rotors.
Described signaling conversion circuit 300, sends to described FPGA400 for described sinusoidal analog signal and cosine analog signal are converted to digital signal;
The signal exported due to resolver is analog signal, and FPGA can only discriminating digit signal, therefore, and the digital signal needing signaling conversion circuit analog signal to be converted to FPGA can to identify.
Described FPGA400, for carrying out the corner processing the rotor obtaining described motor to described digital signal.
Be understandable that, FPGA400 carries out described digital signal analyzing the corner that can obtain rotor.It should be noted that, because resolver 100 only can the absolute position of detection rotor within the scope of 360 degree, when rotor the number of turns that turns more than 1 circle time, FPGA400 will add up the number of turns, the rotor-position that such as current time detects is 270 degree, the rotor-position that subsequent time detects becomes 30 degree, then the number of turns is accumulative adds 1.To realize the accurate detection of stop position.
The system that the present embodiment provides, utilizes resolver to measure the rotor-position of the motor driving treatment head diaphragm.The structure of resolver is stator, rotor and coil, does not comprise any chip, because stator, rotor and coil can stand the chronic exposure of heavy dose of X ray, can not by the interference of X ray, and useful life is long, and Reliability comparotive is high.This system utilizes FPGA realize the excitation con-trol of resolver and carry out to the analog signal that resolver exports the corner that analyzing and processing obtains rotor simultaneously.This system adopts modularized design mode, and structure is simple, and cost is lower.And in prior art, utilizing encoder to carry out the detection of rotor-position, the chip in encoder easily damages by the radiation of X ray, and Reliability comparotive is poor.
System embodiment two:
See Fig. 2, this figure is system embodiment two schematic diagram of measurement linear accelerator provided by the invention treatment head stop position.
The system of the measurement linear accelerator treatment head stop position that the present embodiment provides, also comprises: amplifying circuit 500 and low-pass filter circuit 600;
Described amplifying circuit 500 and low-pass filter circuit 600 are connected between described resolver 100 and described signaling conversion circuit 300;
Described amplifying circuit 500, amplifies for the mutually orthogonal sinusoidal analog signal that exported by described resolver 100 and cosine analog signal;
Described low-pass filter circuit 600, the mutually orthogonal sinusoidal analog signal after amplifying for filtering and the high order harmonic component in cosine analog signal.
It should be noted that, because resolver 100 is arranged on the treatment head of linear accelerator, and the circuit board residing for signaling conversion circuit 300 is arranged on fixed frame, treatment head needs the cable of about about five meters to be connected between the two with fixed frame, signal transmission distance is longer, there is interference signal, therefore need to carry out filtering process, the reliability of further raising system.
In addition, the system that the present embodiment provides also comprises: drive circuit 700;
Described drive circuit 700 is connected between described resolver 100 and described field circuit 200;
Described drive circuit 700, sends to described resolver 100 after the excitation analog signal for being exported by described field circuit 200 carries out amplification filtering.
The usual amplitude com parison of excitation analog signal exported due to field circuit 200 is little, the excitation requirement that resolver 100 needs can not be reached, therefore utilize drive circuit 700 pairs of excitation signals to carry out undistorted amplification, make the amplitude of excitation analog signal reach the excitation requirement of resolver 100 needs.
Such as: the excitation analog signal range value that field circuit exports requires that (Vpp is the abbreviation of peak-peak voltage for 7.0Vpp, the peak-peak voltage that field circuit receives sinusoidal signal and cosine signal is only 3.6Vpp, and the primary side of resolver and secondary side exist transformation ratio, therefore need to utilize drive circuit to carry out gain amplifier process to excitation analog signal.
See Fig. 3, this figure is amplifying circuit provided by the invention and low-pass filter circuit schematic diagram.
The amplifying circuit that the present embodiment provides comprises: the first resistance R49, the second resistance R48, the first electric capacity C109 and the first amplifier N2A;
The first input end of described first amplifier N2A connects described sinusoidal analog signal or the cosine analog signal (that connect in figure is SIN2-1R) of the output of described resolver by described first resistance R49;
Be understandable that, each resolver exports four road signals, i.e. sinusoidal analog signal two-way, and cosine analog signal two-way, is expressed as follows: SIN2-1R, SIN2-2R, COS2-1R, COS2-2R respectively.
The first input end of described first amplifier N2A connects the output of the first amplifier N2A by described second resistance R48, described first electric capacity C109 is connected in parallel on the two ends of described second resistance R48;
Second input of described first amplifier N2A connects reference power source VREF2;
The output of described first amplifier N2A connects the input of described low-pass filter circuit.
The effect of the first amplifier N2A is amplified the signal that resolver exports, and multiplication factor is determined by the resistance of R48 and R49.Wherein the resistance of R48 is not easily too large, otherwise easily produces distributed capacitance.
The effect of C109 is beneficial to the transmission that signal carries out growing distance, can carry out phase compensation on the other hand, prevent circuit from shaking.
The low-pass filter circuit that the present embodiment provides comprises: the 3rd resistance R45, the 4th resistance R46, the second electric capacity C7 and the second amplifier N2B.
The 5th resistance R47 is connected with between low-pass filter circuit and amplifying circuit.
The first input end of the second amplifier N2B connects the first end of the 4th resistance R46, second end of the 4th resistance R46 connects the output of the second amplifier N2B by described 3rd resistance R45, the first input end of the second amplifier N2B connects the output of the second amplifier N2B by the second electric capacity C7.
Second end of the 4th resistance R46 is by the 3rd electric capacity C18 ground connection.
System embodiment three:
See Fig. 4, this figure is system embodiment three schematic diagram of measurement linear accelerator provided by the invention treatment head stop position.
The system that the present embodiment provides, also comprises: voltage follow-up amplifier 800 and push-pull power amplifier 900;
The input of described voltage follow-up amplifier 800 connects the output of described drive circuit 700, the excitation analog signal for described drive circuit 700 is exported carry out buffer compartment from;
Described push-pull power amplifier 900, the excitation analog signal for exporting described voltage follow-up amplifier 800 carries out the amplification of positive half cycle and negative half period.
The physical circuit of voltage follow-up amplifier 800 and push-pull power amplifier 900 can be shown in Figure 5.
Wherein drive circuit comprises: the 3rd amplifier N1B, the 6th resistance R37, the 7th resistance R38 and the 4th electric capacity C16.
The first input end of described 3rd amplifier N1B connects the excitation analog signal of field circuit output by described 6th resistance R37.The first input end of described 3rd amplifier N1B connects the output of the 3rd amplifier N1B by the 7th resistance R38.4th electric capacity C16 is connected in parallel on the two ends of described 7th resistance R38.
The reference voltage VVREF2 of the second input connection of the 3rd amplifier N1B is for determining the DC common-mode current potential of excitation analog signal.
Because the voltage compare of excitation analog signal EXC2-1 is low, the exciting voltage requirement of resolver cannot be met.Therefore the amplitude through N1B amplifies process.The gain of amplifying amplitude is determined by the resistance value ratio of R37 and R38.
C16 and R38 forms low pass filter, reduces the noise of EXC2-1 to the full extent.
Described voltage follow-up amplifier is the 4th amplifier NIC.
N1C plays the effect of buffering and signal isolation, for improving the ability that rear end band is carried, is convenient to follow-up differential signal circuit more good berth.
Push-pull power amplifier 900 comprises the first transistor V30 and transistor seconds V31, and the first transistor V30 is connected with transistor seconds V31 for push-pull type structure.
The positive half cycle of two transistor difference amplification input signals and negative half period, namely the positive half cycle of a transistor amplifying signal is used, with the negative half period of another transistor amplifying signal, the half-cycle signal of two transistor outputs obtains the output signal of a complete cycle after load merges.
Push-pull power amplifier 900 Main Function is the magnitude of voltage and the peak-to-peak value that improve waveform.
System embodiment four:
See Fig. 6, this figure is system embodiment four schematic diagram of measurement linear accelerator provided by the invention treatment head stop position.
The system that the present embodiment provides, also comprises: ferroelectric memory 1000;
Described FPGA400, also for the corner of the rotor when described motor more than 360 degree time, to the corner of described rotor to rotor the number of turns that turns add up, the described number of turns is stored in described ferroelectric memory 1000, when powering at every turn, read the number of turns stored in described ferroelectric memory 1000 and continue accumulative.
Position due to the rotor of resolver measurement is only the angle within the scope of 360 degree, can not identify rotor the number of turns that turns, need FPGA to calculate the number of turns, and by the number of turns stored in ferroelectric memory 1000, when system powers at every turn, FPGA can read the number of turns from ferroelectric memory, proceeds to add up, then by the new number of turns stored in ferroelectric memory.
In addition, this system also comprises: first interface circuit 1100 and the second interface circuit 1200;
Described first interface circuit 1100 is connected between described resolver 100 and described signaling conversion circuit 300;
Described first interface circuit 1100, the orthogonal analog signal of the two-phase for being exported by described resolver 100 is all converted to differential signal and exports to described signaling conversion circuit 300;
Described second interface circuit 1200 is connected between described FPGA400 and host computer 1300;
Described second interface circuit 1200, is transferred to described host computer 1300 after the data for described FPGA400 being uploaded to described host computer 1300 are converted to differential signal.
Be understandable that, the Main Function of first interface circuit and the second interface circuit the signal of transmission is converted to differential signal transmit, and differential signal is applicable to the transmission of longer distance, can eliminate interference signal.
Described second interface circuit also comprises: three transient voltage suppressor;
A described transient voltage suppressor is connected between two differential signal transmission of described second interface circuit;
A described transient voltage suppressor is connected between differential signal with ground respectively described in every root.
Transient voltage suppressor can anti-locking system because of the pulse signal of moment, the signal data that the such as surge of static discharge effect, AC power and the noise of Switching Power Supply cause malfunctioning.Overvoltage can be clamped in the scope that circuit can bear by transient voltage suppressor.Due to the impact of high-energy X-rays, therefore add transient voltage suppressor and realize frequency converter in data transmission procedure.
See Fig. 7, this figure is power-fail detection circuit schematic diagram provided by the invention.
The system that the present embodiment provides, also comprises: power-fail detection circuit;
Described power-fail detection circuit, for the supply voltage of detection system, when the supply voltage power down of system being detected, then sends power-off signal to described FPGA;
Described FPGA, for stopping the digital signal receiving the transmission of described signaling conversion circuit after receiving described power-off signal.
As shown in Figure 7, utilize+5V the voltage of chip D10 detection system, when+5V Voltage Drop being detected,
output low level signal CPLDINT to FPGA, because FPGA and signaling conversion circuit adopt different operating voltages.Now FPGA is also in normal work.When FPGA receives power-off signal, stop the digital signal receiving the transmission of described signaling conversion circuit, thus realize accuracy and the reliability of system acquisition data.
The voltage range of simultaneously above-mentioned field circuit needs to be consistent with the voltage range of FPGA.Because the voltage range of FPGA is narrow, when system power failure time, field circuit terminates normal work prior to FPGA, cause preservation data inaccurate, therefore by power-fail detection circuit, FPGA can the magnitude of voltage of Real-Time Monitoring field circuit, ensures the accuracy of preserving data.
It should be noted that, because treatment head diaphragm is four parts, every part is driven by a motor, the corresponding resolver of each motor, above embodiment is all be described for the signals transmission of a resolver, the signals transmission of other resolvers is similar, does not repeat them here.
In order to make those skilled in the art understand technical scheme provided by the invention better, the annexation of resolver and motor and diaphragm is described below in conjunction with figure.
See Fig. 8, this figure is the scheme of installation of resolver provided by the invention.
Motor 801 drives diaphragm 806 to move by pinion 802, gear wheel 803, shaft coupling knot 804, leading screw 805 successively.
Resolver 100 is tied 804 by fixed axis 807 with chain 808 and shaft coupling successively and is connected, thus detects the corner of the rotor of motor 801.
Shown in Fig. 8 is only the connection diagram of the corresponding resolver of motor and one piece of diaphragm, other similar, and this is no longer going to repeat them.
The above is only preferred embodiment of the present invention, not does any pro forma restriction to the present invention.Although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention.Any those of ordinary skill in the art, do not departing under technical solution of the present invention ambit, the Method and Technology content of above-mentioned announcement all can be utilized to make many possible variations and modification to technical solution of the present invention, or be revised as the Equivalent embodiments of equivalent variations.Therefore, every content not departing from technical solution of the present invention, according to technical spirit of the present invention to any simple modification made for any of the above embodiments, equivalent variations and modification, all still belongs in the scope of technical solution of the present invention protection.
Claims (10)
1. measure a system for linear accelerator treatment head stop position, it is characterized in that, comprising: resolver, field circuit, signaling conversion circuit and FPGA;
A corresponding one piece for the treatment of head diaphragm of described resolver;
Described field circuit, the excitation digital signal for being exported by described FPGA is converted to excitation analog signal and sends to described resolver, and described excitation analog signal is used for carrying out excitation to described resolver;
Described resolver, for working under the excitation of described field circuit, measuring the corner of the rotor of the motor driving described treatment head diaphragm, exporting mutually orthogonal sinusoidal analog signal and cosine analog signal;
Described signaling conversion circuit, sends to described FPGA for described sinusoidal analog signal and cosine analog signal are converted to digital signal;
Described FPGA, for carrying out the corner processing the rotor obtaining described motor to described digital signal.
2. the system of measurement linear accelerator treatment head stop position according to claim 1, is characterized in that, also comprise: amplifying circuit and low-pass filter circuit;
Described amplifying circuit and low-pass filter circuit are connected between described resolver and described signaling conversion circuit;
Described amplifying circuit, amplifies for the mutually orthogonal sinusoidal analog signal that exported by described resolver and cosine analog signal;
Described low-pass filter circuit, the mutually orthogonal sinusoidal analog signal after amplifying for filtering and the high order harmonic component in cosine analog signal.
3. the system of measurement linear accelerator treatment head stop position according to claim 2, it is characterized in that, described amplifying circuit comprises: the first resistance, the second resistance, the first electric capacity and the first amplifier;
The first input end of described first amplifier connects described sinusoidal analog signal or the cosine analog signal of the output of described resolver by described first resistance;
The first input end of described first amplifier connects the output of the first amplifier by described second resistance, described first Capacitance parallel connection is at the two ends of described second resistance;
Second input of described first amplifier connects reference power source;
The output of described first amplifier connects the input of described low-pass filter circuit.
4. the system of measurement linear accelerator treatment head stop position according to claim 1, is characterized in that, also comprise: drive circuit;
Described drive circuit is connected between described resolver and described field circuit;
Described drive circuit, sends to described resolver after the excitation analog signal for being exported by described field circuit carries out amplification filtering.
5. the system of measurement linear accelerator treatment head stop position according to claim 4, is characterized in that, also comprise: voltage follow-up amplifier and push-pull power amplifier;
The input of described voltage follow-up amplifier connects the output of described drive circuit, the excitation analog signal for described drive circuit is exported carry out buffer compartment from;
Described push-pull power amplifier, the excitation analog signal for exporting described voltage follow-up amplifier carries out the amplification process of positive half cycle and negative half period.
6. the system of measurement linear accelerator treatment head stop position according to claim 1, is characterized in that, also comprise: ferroelectric memory;
Described FPGA, also for the corner of the rotor when described motor more than 360 degree time, to the corner of described rotor to rotor the number of turns that turns add up, the described number of turns is stored in described ferroelectric memory, when powering at every turn, read the number of turns stored in described ferroelectric memory and continue accumulative.
7. the system of measurement linear accelerator treatment head stop position according to claim 1, is characterized in that, also comprise: first interface circuit and the second interface circuit;
Described first interface circuit is connected between described resolver and described signaling conversion circuit;
Described first interface circuit, the sinusoidal analog signal that the two-phase for being exported by described resolver is orthogonal and cosine analog signal are all converted to differential signal and export to described signaling conversion circuit;
Described second interface circuit is connected between described FPGA and host computer;
Described second interface circuit, the data for described FPGA being uploaded to described host computer are converted to differential signal transmission to described host computer.
8. the system of measurement linear accelerator treatment head stop position according to claim 7, it is characterized in that, described second interface circuit also comprises: three transient voltage suppressor;
A described transient voltage suppressor is connected between two differential signal transmission of described second interface circuit;
A described transient voltage suppressor is connected between differential signal transmission with ground described in every root.
9. the system of measurement linear accelerator treatment head stop position according to claim 1, is characterized in that, also comprise power-fail detection circuit;
Described power-fail detection circuit, for the supply voltage of detection system, when the supply voltage power down of system being detected, then sends power-off signal to described FPGA;
Described FPGA, for stopping the digital signal receiving the transmission of described signaling conversion circuit after receiving described power-off signal.
10. the system of measurement linear accelerator treatment head stop position according to claim 4, it is characterized in that, described drive circuit comprises: the 3rd amplifier, the 6th resistance, the 7th resistance and the 4th electric capacity;
The first input end of described 3rd amplifier connects the excitation analog signal of field circuit output by described 6th resistance;
The first input end of described 3rd amplifier connects the output of the 3rd amplifier by the 7th resistance;
4th Capacitance parallel connection is at the two ends of described 7th resistance.
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| CN201510676032.8A CN105391368B (en) | 2015-10-13 | 2015-10-13 | A kind of system for measuring linear accelerator treatment head stop position |
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Address after: 110179 No. 177-1 Innovation Road, Hunnan District, Shenyang City, Liaoning Province Patentee after: Shenyang Neusoft Medical Systems Co.,Ltd. Address before: Hunnan New Century Road 110179 Shenyang city of Liaoning Province, No. 16 Patentee before: SHENYANG NEUSOFT MEDICAL SYSTEMS Co.,Ltd. |
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