CN105391368B - A kind of system for measuring linear accelerator treatment head stop position - Google Patents
A kind of system for measuring linear accelerator treatment head stop position Download PDFInfo
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- CN105391368B CN105391368B CN201510676032.8A CN201510676032A CN105391368B CN 105391368 B CN105391368 B CN 105391368B CN 201510676032 A CN201510676032 A CN 201510676032A CN 105391368 B CN105391368 B CN 105391368B
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- 230000005284 excitation Effects 0.000 claims abstract description 47
- 238000005259 measurement Methods 0.000 claims abstract description 27
- 238000006243 chemical reaction Methods 0.000 claims abstract description 24
- 230000011664 signaling Effects 0.000 claims abstract description 21
- 238000012545 processing Methods 0.000 claims abstract description 11
- 238000001514 detection method Methods 0.000 claims description 15
- 230000001052 transient effect Effects 0.000 claims description 12
- 230000005540 biological transmission Effects 0.000 claims description 9
- 230000008054 signal transmission Effects 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 6
- 238000001914 filtration Methods 0.000 claims description 6
- 230000003139 buffering effect Effects 0.000 claims description 4
- 238000002955 isolation Methods 0.000 claims description 4
- 230000005621 ferroelectricity Effects 0.000 claims description 2
- 230000001684 chronic effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 14
- 230000008859 change Effects 0.000 description 5
- 238000004804 winding Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000004088 simulation Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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
-
- 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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- Health & Medical Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biomedical Technology (AREA)
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- Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
- Radiology & Medical Imaging (AREA)
- Life Sciences & Earth Sciences (AREA)
- Animal Behavior & Ethology (AREA)
- General Health & Medical Sciences (AREA)
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- Power Engineering (AREA)
- Transmission And Conversion Of Sensor Element Output (AREA)
- Radiation-Therapy Devices (AREA)
Abstract
The present invention provides a kind of system for measuring linear accelerator treatment head stop position, including：Rotary transformer, field circuit, signaling conversion circuit and FPGA；The corresponding one piece for the treatment of head diaphragm of one rotary transformer；The excitation data signal that the FPGA is exported is converted to excitation analog signal and is sent to rotary transformer by field circuit, and excitation analog signal is used to carry out excitation to rotary transformer；Rotary transformer is used to work under the excitation of field circuit, the corner of the rotor of the motor of measurement driving treatment head diaphragm, exports mutually orthogonal sinusoidal analog signal and cosine analog signal；Signaling conversion circuit is sent to FPGA for sinusoidal analog signal and cosine analog signal to be converted into data signal；FPGA is used to carry out data signal the corner that processing obtains the rotor of motor.Utilize rotary transformer measurement motor rotor-position.Rotary transformer does not include any chip, is subjected to X ray chronic exposure, and Reliability comparotive is high.
Description
Technical field
The present invention relates to technical field of medical instruments, more particularly to a kind of measurement linear accelerator treatment head stop position
System.
Background technology
The treatment head diaphragm of medical computerized linear accelerator drives its motion by motor, and motor control treatment head diaphragm is beaten
Open and close are closed so as to control the output dose of X ray.Therefore, moved to accurately control treatment head diaphragm, it is necessary in real time
The rotor-position of motor is detected, so as to obtain the particular location for the treatment of head diaphragm.
In the prior art, because the data processing circuit of encoder is fairly simple, and high-resolution is easily realized, exported
Signal is also smoother.Therefore, the measurement to the rotor-position of motor is realized using encoder, realizes the position to treatment head diaphragm
Put control.Treatment head diaphragm includes four pieces, and every piece of diaphragm is correspondingly arranged an encoder, sets four encoders altogether.
Medical computerized linear accelerator is different from other occasions for using encoder, because decoder internal is integrated with core
Piece, the x-ray dose that linear accelerator uses is bigger, and signal interference is more severe.Chip in encoder is for a long time in X ray
Radiation under be easily damaged.
Therefore, those skilled in the art need to provide a kind of system for measuring linear accelerator treatment head stop position, energy
The position of linear accelerator treatment head diaphragm is enough measured, while and can meets to be damaged under the irradiation of heavy dose of X ray,
The reliability of guarantee system.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of system for measuring linear accelerator treatment head stop position, energy
The position of the treatment head diaphragm of linear accelerator is enough measured, while and can meets to be damaged under the irradiation of heavy dose of X ray
It is bad, ensure the reliability of system.
The embodiment of the present invention provides a kind of system for measuring linear accelerator treatment head stop position, including：Rotate transformation
Device, field circuit, signaling conversion circuit and FPGA；
The corresponding one piece for the treatment of head diaphragm of one rotary transformer；
The field circuit, the excitation data signal for the FPGA to be exported are converted to excitation analog signal and are sent to
The rotary transformer, the excitation analog signal are used to carry out excitation to the rotary transformer；
The rotary transformer, for being worked under the excitation of the field circuit, measurement drives the treatment head diaphragm
Motor rotor corner, export mutually orthogonal sinusoidal analog signal and cosine analog signal；
The signaling conversion circuit, for the sinusoidal analog signal and cosine analog signal to be converted into data signal hair
Give the FPGA；
The FPGA, the corner for obtaining the rotor of the motor for carrying out processing to the data signal.
Preferably, in addition to：Amplifying circuit and low-pass filter circuit；
The amplifying circuit and low-pass filter circuit are connected between the rotary transformer and the signaling conversion circuit；
The amplifying circuit, for the mutually orthogonal sinusoidal analog signal and cosine mould for exporting the rotary transformer
Intend signal to be amplified；
The low-pass filter circuit, for filtering out mutually orthogonal sinusoidal analog signal and cosine analog signal after amplifying
In higher hamonic wave.
Preferably, the amplifying circuit includes：First resistor, second resistance, the first electric capacity and the first amplifier；
The first input end of first amplifier connects the institute of the rotary transformer output by the first resistor
State sinusoidal analog signal or cosine analog signal；
The first input end of first amplifier connects the output end of the first amplifier by the second resistance, described
First electric capacity is connected in parallel on the both ends of the second resistance；
The second input connection reference power source of first amplifier；
The output end of first amplifier connects the input of the low-pass filter circuit.
Preferably, in addition to：Drive circuit；
The drive circuit is connected between the rotary transformer and the field circuit；
The drive circuit, the excitation analog signal for the field circuit to be exported are sent to after being amplified filtering
The rotary transformer.
Preferably, in addition to：Voltage follow-up amplifier and push-pull power amplifier；
The input of the voltage follow-up amplifier connects the output end of the drive circuit, for by the drive circuit
The excitation analog signal of output carries out buffering isolation；
The push-pull power amplifier, the excitation analog signal for being exported to the voltage follow-up amplifier are carried out just
The enhanced processing of half cycle and negative half period.
Preferably, in addition to：Ferroelectric memory；
The FPGA, it is additionally operable to when the corner of the rotor of the motor is more than 360 degree, to the corner of the rotor to turning
The number of turns that son turns is added up, and the number of turns is stored in the ferroelectric memory, when upper electric every time, reads the ferroelectricity
The number of turns stored in memory continues to add up.
Preferably, in addition to：First interface circuit and second interface circuit；
The first interface circuit is connected between the rotary transformer and the signaling conversion circuit；
The first interface circuit, the orthogonal sinusoidal analog signal of two-phase for the rotary transformer to be exported and remaining
String analog signal is converted into differential signal and exported to the signaling conversion circuit；
The second interface circuit is connected between the FPGA and host computer；
The second interface circuit, the data for the FPGA to be uploaded to the host computer are converted to differential signal biography
It is defeated by the host computer.
Preferably, the second interface circuit also includes：Three transient voltage suppressors；
A transient voltage is connected between two differential signal transmissions of the second interface circuit and suppresses two poles
Pipe；
A transient voltage suppressor is connected between the every differential signal transmission and ground.
Preferably, in addition to power-fail detection circuit；
The power-fail detection circuit, for the supply voltage of detecting system, when the supply voltage power down for the system that detects,
Power-off signal is then sent to the FPGA；
The FPGA, for stopping receiving the numeral letter of the signaling conversion circuit transmission after power-off signal is received
Number.
Preferably, the drive circuit includes：3rd amplifier, the 6th resistance, the 7th resistance and the 4th electric capacity；
The excitation that the first input end of 3rd amplifier connects field circuit output by the 6th resistance is simulated
Signal；
The first input end of 3rd amplifier connects the output end of the 3rd amplifier by the 7th resistance；
4th electric capacity is connected in parallel on the both ends of the 7th resistance.
Compared with prior art, the present invention has advantages below：
The system that the present embodiment provides, the rotor position of the motor of driving treatment head diaphragm is measured using rotary transformer
Put.The structure of rotary transformer is stator, rotor and coil, not including any chip, because stator, rotor and coil can be through
By the chronic exposure of heavy dose of X ray, it will not be disturbed by X ray, service life is long, and Reliability comparotive is high.Simultaneously should
System is realized to the excitation con-trol of rotary transformer using FPGA and the analog signal of rotary transformer output is analyzed
Processing obtains the corner of rotor.The system uses modularized design mode, and simple in construction, cost is relatively low.And prior art
The middle detection that rotor-position is carried out using encoder, the chip in encoder are easily damaged by the radiation of X ray, reliability ratio
It is poor.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the schematic diagram of system embodiment one of measurement linear accelerator treatment head stop position provided by the invention；
Fig. 2 is the schematic diagram of system embodiment two of measurement linear accelerator treatment head stop position provided by the invention；
Fig. 3 is amplifying circuit and low-pass filter circuit schematic diagram provided by the invention；
Fig. 4 is the schematic diagram of system embodiment three of measurement linear accelerator treatment head stop position provided by the invention；
Fig. 5 is the circuit diagram of drive circuit voltage follow-up amplifier and push-pull power amplifier provided by the invention；
Fig. 6 is the schematic diagram of system embodiment four of measurement linear accelerator treatment head stop position provided by the invention；
Fig. 7 is power-fail detection circuit schematic diagram provided by the invention；
Fig. 8 is the scheme of installation of rotary transformer provided by the invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
In order to facilitate the understanding of the purposes, features and advantages of the present invention, below in conjunction with the accompanying drawings to the present invention
Embodiment be described in detail.
System embodiment one：
Referring to Fig. 1, the figure is the system embodiment one of measurement linear accelerator treatment head stop position provided by the invention
Schematic diagram.
The system for the measurement linear accelerator treatment head stop position that the present embodiment provides, including：Rotary transformer 100,
Field circuit 200, signaling conversion circuit 300 and field programmable gate array (FPGA, Field-Programmable Gate
Array)400；
The corresponding one piece for the treatment of head diaphragm of one rotary transformer 100；
At present, the treatment head diaphragm of linear accelerator includes four pieces, and four pieces for the treatment of head diaphragms are relative to treatment head
Central point is uniformly distributed；The size of the opening for the treatment of head diaphragm determines the size of X ray output dose.Every piece for the treatment of head diaphragm by
A single motor drives its motion.One rotary transformer measures the position of the rotor of a motor.Therefore, the rotation
Transformer 100 includes four, the corresponding one piece for the treatment of head diaphragm of each rotary transformer 100.
It should be noted that the change on X1, X2, Y1 and Y2 position can occur for four pieces for the treatment of head diaphragms, that is, opened
Moved back and forth with closure.Wherein X1 and X2 represents the positive axis of X-axis and negative semiaxis, and Y1 and Y2 represent the positive axis and negative half of Y-axis
Axle.Therefore four rotary transformers are also distributed according to the position for the treatment of head diaphragm, can detect the motion for the treatment of head diaphragm
Position.
The field circuit 200, the excitation data signal for the FPGA to be exported are converted to excitation analog signal hair
The rotary transformer 100 is given, the excitation analog signal is used to carry out excitation to the rotary transformer 100；
It should be noted that rotary transformer 100 is a kind of special detection means, therefore excitation is needed to believe during its work
Number input driving circuit is driven (work)
The rotary transformer 100, for being worked under the excitation of the field circuit, measurement driving treatment head diaphragm
The rotor-position of motor, export mutually orthogonal sinusoidal analog signal and cosine analog signal；
Spy of the corner of rotary transformer referred to as rotation change (resolver), its output voltage and rotor into certain functional relation
Kind motor, its first side winding and secondary side winding are arranged on stator.Electricity between first side winding and secondary side winding
The corner of magnetic coupling degree and rotor is closely related.Rotary transformer is a rotatable transformer.The rotation of rotor changes
Magnetic resistance is become, so as to change the electric signal relation of input and output.The output signal of rotary transformer is the orthogonal sine of two-phase
Analog signal and cosine analog signal, the amplitude of analog signal do sine and cosine change, frequency and excitation frequency with the corner of rotor
Rate is consistent.
The external world is needed to provide excitation for it when rotary transformer 100 works.
It should be noted that rotary transformer 100 detect be 360 degree of angle internal rotors absolute position.
The signaling conversion circuit 300, for the sinusoidal analog signal and cosine analog signal to be converted into digital letter
Number it is sent to the FPGA400；
Because the signal of rotary transformer output is analog signal, and FPGA can only identify data signal, therefore, it is necessary to believe
Number change-over circuit converts analog signals into the data signal that FPGA can be identified.
The FPGA400, the corner for obtaining the rotor of the motor for carrying out processing to the data signal.
It is understood that FPGA400 analyzes the data signal corner that can obtain rotor.Need to illustrate
, because rotary transformer 100 can only detect absolute position of the rotor in the range of 360 degree, when the number of turns that rotor turns
During more than 1 circle, FPGA400 will add up to the number of turns, such as the rotor-position of current time detection is 270 degree, lower a period of time
The rotor-position for carving detection is changed into 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, the rotor position of the motor of driving treatment head diaphragm is measured using rotary transformer
Put.The structure of rotary transformer is stator, rotor and coil, not including any chip, because stator, rotor and coil can be through
By the chronic exposure of heavy dose of X ray, it will not be disturbed by X ray, service life is long, and Reliability comparotive is high.Simultaneously should
System is realized to the excitation con-trol of rotary transformer using FPGA and the analog signal of rotary transformer output is analyzed
Processing obtains the corner of rotor.The system uses modularized design mode, and simple in construction, cost is relatively low.And prior art
The middle detection that rotor-position is carried out using encoder, the chip in encoder are easily damaged by the radiation of X ray, reliability ratio
It is poor.
System embodiment two：
Referring to Fig. 2, the figure is the system embodiment two of measurement linear accelerator treatment head stop position provided by the invention
Schematic diagram.
The system for the measurement linear accelerator treatment head stop position that the present embodiment provides, in addition to：The He of amplifying circuit 500
Low-pass filter circuit 600；
The amplifying circuit 500 and low-pass filter circuit 600 are connected to the rotary transformer 100 and signal conversion
Between circuit 300；
The amplifying circuit 500, for the mutually orthogonal sinusoidal analog signal that exports the rotary transformer 100 and
Cosine analog signal is amplified；
The low-pass filter circuit 600, for filtering out the mutually orthogonal sinusoidal analog signal after amplifying and cosine simulation
Higher hamonic wave in signal.
It should be noted that because rotary transformer 100 is arranged in the treatment head of linear accelerator, and signal conversion electricity
Circuit board residing for road 300 is arranged on fixed frame, and treatment head and fixed frame need about five meters or so between the two
Cable is attached, and signal transmission distance is longer, interference signal be present, it is therefore desirable to is filtered processing, is further improved system
The reliability of system.
In addition, the system that the present embodiment provides also includes：Drive circuit 700；
The drive circuit 700 is connected between the rotary transformer 100 and the field circuit 200；
The drive circuit 700, after the excitation analog signal for the field circuit 200 to be exported is amplified filtering
It is sent to the rotary transformer 100.
Because the usual amplitude com parison of excitation analog signal that field circuit 200 exports is small, it is impossible to reach rotary transformer 100
The excitation requirement needed, therefore undistorted amplification is carried out to excitation signal using drive circuit 700, make excitation analog signal
Amplitude reaches the excitation requirement of the needs of rotary transformer 100.
Such as：The excitation analog signal range value requirement of field circuit output is that (Vpp is peak-peak voltage to 7.0Vpp
Abbreviation, it is only 3.6Vpp that field circuit, which receives sinusoidal signal and the peak-peak voltage of cosine signal, and rotary transformer is once
There is transformation ratio in side and secondary side, it is therefore desirable to be amplified gain process to excitation analog signal using drive circuit.
Referring to Fig. 3, the figure is amplifying circuit and low-pass filter circuit schematic diagram provided by the invention.
The amplifying circuit that the present embodiment provides includes：First resistor R49, second resistance R48, the first electric capacity C109 and first
Amplifier N2A；
The first input end of the first amplifier N2A is defeated by the first resistor R49 connections rotary transformer
The sinusoidal analog signal or cosine analog signal gone out (that connected in figure is SIN2-1R)；
It is understood that each rotary transformer exports four road signals, i.e. sinusoidal analog signal two-way, cosine simulation letter
Number two-way, represent respectively as follows：SIN2-1R、SIN2-2R、COS2-1R、COS2-2R.
The first input end of the first amplifier N2A is defeated by the first amplifier of second resistance R48 connections N2A's
Go out end, the first electric capacity C109 is connected in parallel on the both ends of the second resistance R48；
The second input connection reference power source VREF2 of the first amplifier N2A；
The output end of the first amplifier N2A connects the input of the low-pass filter circuit.
First amplifier N2A effect is that the signal of rotary transformer output is amplified, multiplication factor by R48 and
R49 resistance determines.Wherein R48 resistance is not easy too big, otherwise easily produces distribution capacity.
C109 effect is to be beneficial to the transmission that signal carries out long range, on the other hand can carry out phase compensation, prevent electricity
Shake on road.
The low-pass filter circuit that the present embodiment provides includes：3rd resistor R45, the 4th resistance R46, the second electric capacity C7 and
Two amplifier N2B.
The 5th resistance R47 is connected between low-pass filter circuit and amplifying circuit.
Second amplifier N2B first input end connects the 4th resistance R46 first end, the 4th resistance R46 the second end
By the second amplifier of 3rd resistor R45 connections N2B output end, the second amplifier N2B first input end passes through
Two electric capacity C7 the second amplifiers of connection N2B output end.
4th resistance R46 the second end is grounded by the 3rd electric capacity C18.
System embodiment three：
Referring to Fig. 4, the figure is the system embodiment three of measurement linear accelerator treatment head stop position provided by the invention
Schematic diagram.
The system that the present embodiment provides, in addition to：Voltage follow-up amplifier 800 and push-pull power amplifier 900；
The input of the voltage follow-up amplifier 800 connects the output end of the drive circuit 700, for by the drive
The excitation analog signal that dynamic circuit 700 exports carries out buffering isolation；
The push-pull power amplifier 900, for the excitation analog signal exported to the voltage follow-up amplifier 800
Carry 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 may refer to shown in Fig. 5.
Wherein drive circuit includes：3rd amplifier N1B, the 6th resistance R37, the 7th resistance R38 and the 4th electric capacity C16.
The first input end of the 3rd amplifier N1B is encouraged by what the 6th resistance R37 connections field circuit exported
Magnetic analog signal.The first input end of the 3rd amplifier N1B passes through the defeated of the amplifier N1B of the 7th resistance R38 connections the 3rd
Go out end.4th electric capacity C16 is connected in parallel on the both ends of the 7th resistance R38.
The reference voltage VVREF2 of 3rd amplifier N1B the second input connection is used to determine the straight of excitation analog signal
Flow common mode current potential.
Because excitation analog signal EXC2-1 voltage ratio is relatively low, the excitation voltage requirement of rotary transformer can not be met.
Therefore by N1B amplitude enhanced processing.The gain of amplification amplitude is determined by R37 and R38 resistance value ratio.
C16 and R38 composition low pass filters, EXC2-1 noise is reduced to the full extent.
The voltage follow-up amplifier is the 4th amplifier NIC.
N1C plays a part of buffering and signal isolation, the ability carried for improving rear end band, is easy to follow-up differential signal electricity
Road more good berth.
Push-pull power amplifier 900 includes the first transistor V30 and second transistor V31, the first transistor V30 and
Two-transistor V31 is connected as push-pull type structure.
Two transistors amplify the positive half cycle and negative half period of input signal respectively, i.e., with a transistor amplified signal just
Half cycle, with the negative half period of another transistor amplified signal, the half-cycle signal of two transistor output obtains after load merges
The output signal of one complete cycle.
The main function of push-pull power amplifier 900 is the magnitude of voltage and peak-to-peak value for improving waveform.
System embodiment four：
Referring to Fig. 6, the figure is the system embodiment four of measurement linear accelerator treatment head stop position provided by the invention
Schematic diagram.
The system that the present embodiment provides, in addition to：Ferroelectric memory 1000；
The FPGA400, it is additionally operable to when the corner of the rotor of the motor is more than 360 degree, to the corner of the rotor
The number of turns that rotor turns is added up, the number of turns is stored in the ferroelectric memory 1000, when upper electric every time, is read
The number of turns stored in the ferroelectric memory 1000 continues to add up.
Because the position of the rotor of rotary transformer measurement is only the angle in the range of 360 degree, it is impossible to identify that rotor turns
The number of turns, it is necessary to FPGA to calculate the number of turns, and the number of turns is stored in ferroelectric memory 1000, when system is upper electric every time, FPGA
The number of turns can be read from ferroelectric memory, continues to add up, then by new number of turns deposit ferroelectric memory.
In addition, the system also includes：First interface circuit 1100 and second interface circuit 1200；
The first interface circuit 1100 is connected between the rotary transformer 100 and the signaling conversion circuit 300；
The first interface circuit 1100, the orthogonal analog signal of two-phase for the rotary transformer 100 to be exported
Differential signal is converted into export to the signaling conversion circuit 300；
The second interface circuit 1200 is connected between the FPGA400 and host computer 1300；
The second interface circuit 1200, for the FPGA400 to be uploaded to the data conversion of the host computer 1300
To be transferred to the host computer 1300 after differential signal.
It is understood that the main function of first interface circuit and second interface circuit is to be converted to the signal of transmission
Differential signal is transmitted, and differential signal is applied to the transmission of relatively long distance, can eliminate interference signal.
The second interface circuit also includes：Three transient voltage suppressors；
A transient voltage is connected between two differential signal transmissions of the second interface circuit and suppresses two poles
Pipe；
A transient voltage suppressor is connected respectively between the every differential signal and ground.
Transient voltage suppressor can anti-locking system because of the pulse signal of moment, such as static discharge effect, exchange
The failure of signal data caused by the surge of power supply and the noise of Switching Power Supply.Transient voltage suppressor can be by overvoltage
Clamp is in the range of circuit can be born.Due to the influence of high-energy X-rays, therefore it is real to add transient voltage suppressor
Now to frequency converter in data transmission procedure.
Referring to Fig. 7, the figure is power-fail detection circuit schematic diagram provided by the invention.
The system that the present embodiment provides, in addition to：Power-fail detection circuit；
The power-fail detection circuit, for the supply voltage of detecting system, when the supply voltage power down for the system that detects,
Power-off signal is then sent to the FPGA；
The FPGA, for stopping receiving the numeral letter of the signaling conversion circuit transmission after power-off signal is received
Number.
As shown in fig. 7, using the+5V voltages of chip D10 detecting systems, when detecting+5V Voltage Drops,
Low level signal CPLDINT is exported to FPGA, because FPGA and signaling conversion circuit use different operating voltages.Now FPGA
Also in normal work.When FPGA receives power-off signal, stop receiving the data signal that the signaling conversion circuit is sent, from
And realize the accuracy and reliability of system acquisition data.
The voltage range of simultaneously above-mentioned field circuit needs the voltage range with FPGA to be consistent.Because FPGA electricity
Pressure scope is narrow, and when system power failure, field circuit terminates normal work prior to FPGA, causes preservation data to be forbidden
Really, therefore by power-fail detection circuit, FPGA can monitor the magnitude of voltage of field circuit in real time, ensure to preserve the accurate of data
Property.
It should be noted that because treatment head diaphragm is four parts, driven per part by a motor, each motor is corresponding
One rotary transformer, above example are illustrated by taking the signals transmission of a rotary transformer as an example, its
His signals transmission of rotary transformer is similar, will not be repeated here.
In order that those skilled in the art more fully understand technical scheme provided by the invention, with reference to figure explanation rotation
The annexation of transformer and motor and diaphragm.
Referring to Fig. 8, the figure is the scheme of installation of rotary transformer provided by the invention.
Motor 801 passes sequentially through little gear 802, gear wheel 803, shaft coupling knot 804, leading screw 805 and drives diaphragm 806 to move.
Rotary transformer 100 passes sequentially through fixing axle 807 and chain 808 is connected with shaft coupling knot 804, so as to detect motor
The corner of 801 rotor.
Shown in Fig. 8 is only the connection diagram of the corresponding rotary transformer of a motor and one piece of diaphragm, other
Similar, this is no longer going to repeat them.
The above described is only a preferred embodiment of the present invention, any formal limitation not is made to the present invention.Though
So the present invention is disclosed above with preferred embodiment, but is not limited to the present invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical scheme makes many possible changes and modifications, or is revised as the equivalent embodiment of equivalent variations.Therefore, it is every without departing from
The content of technical solution of the present invention, the technical spirit according to the present invention is to any simple modification made for any of the above embodiments, equivalent
Change and modification, still fall within technical solution of the present invention protection in the range of.
Claims (10)
- A kind of 1. system for measuring linear accelerator treatment head stop position, it is characterised in that including：Rotary transformer, excitation Circuit, signaling conversion circuit and FPGA；The corresponding one piece for the treatment of head diaphragm of one rotary transformer, every piece for the treatment of head diaphragm are driven by a single motor Its motion is moved, a rotary transformer measures the position of the rotor of a motor；The field circuit, the excitation data signal for the FPGA to be exported be converted to excitation analog signal be sent to it is described Rotary transformer, the excitation analog signal are used to carry out excitation to the rotary transformer；The rotary transformer, for being worked under the excitation of the field circuit, measurement drives the electricity of the treatment head diaphragm The corner of the rotor of machine, export mutually orthogonal sinusoidal analog signal and cosine analog signal；The signaling conversion circuit, it is sent to for the sinusoidal analog signal and cosine analog signal to be converted into data signal The FPGA；The FPGA, the corner for obtaining the rotor of the motor for carrying out processing to the data signal.
- 2. the system of measurement linear accelerator treatment head stop position according to claim 1, it is characterised in that also wrap Include：Amplifying circuit and low-pass filter circuit；The amplifying circuit and low-pass filter circuit are connected between the rotary transformer and the signaling conversion circuit；The amplifying circuit, mutually orthogonal sinusoidal analog signal and cosine for the rotary transformer to be exported simulate letter Number it is amplified；The low-pass filter circuit, for filtering out in the mutually orthogonal sinusoidal analog signal and cosine analog signal after amplifying Higher hamonic wave.
- 3. the system of measurement linear accelerator treatment head stop position according to claim 2, it is characterised in that described to put Big circuit includes：First resistor, second resistance, the first electric capacity and the first amplifier；The first input end of first amplifier by the first resistor connect that the rotary transformer exports it is described just String analog signal or cosine analog signal；The first input end of first amplifier by the second resistance connect the first amplifier output end, described first Electric capacity is connected in parallel on the both ends of the second resistance；The second input connection reference power source of first amplifier；The output end of first amplifier connects the input of the low-pass filter circuit.
- 4. the system of measurement linear accelerator treatment head stop position according to claim 1, it is characterised in that also wrap Include：Drive circuit；The drive circuit is connected between the rotary transformer and the field circuit；The drive circuit, the excitation analog signal for the field circuit to be exported be amplified after filtering be sent to it is described Rotary transformer.
- 5. the system of measurement linear accelerator treatment head stop position according to claim 4, it is characterised in that also wrap Include：Voltage follow-up amplifier and push-pull power amplifier；The input of the voltage follow-up amplifier connects the output end of the drive circuit, for the drive circuit to be exported Excitation analog signal carry out buffering isolation；The push-pull power amplifier, the excitation analog signal for being exported to the voltage follow-up amplifier carry out positive half cycle With the enhanced processing of negative half period.
- 6. the system of measurement linear accelerator treatment head stop position according to claim 1, it is characterised in that also wrap Include：Ferroelectric memory；The FPGA, it is additionally operable to when the corner of the rotor of the motor is more than 360 degree, to the corner of the rotor to rotor institute The number of turns turned is added up, and the number of turns is stored in the ferroelectric memory, when upper electric every time, reads the ferroelectricity storage The number of turns stored in device continues to add up.
- 7. the system of measurement linear accelerator treatment head stop position according to claim 1, it is characterised in that also wrap Include：First interface circuit and second interface circuit；The first interface circuit is connected between the rotary transformer and the signaling conversion circuit；The first interface circuit, two-phase for the rotary transformer to be exported orthogonal sinusoidal analog signal and cosine mould Plan signal is converted into differential signal and exported to the signaling conversion circuit；The second interface circuit is connected between the FPGA and host computer；The second interface circuit, the data for the FPGA to be uploaded to the host computer be converted to differential signal transmission to The host computer.
- 8. the system of measurement linear accelerator treatment head stop position according to claim 7, it is characterised in that described the Two interface circuits also include：Three transient voltage suppressors；A transient voltage suppressor is connected between two differential signal transmissions of the second interface circuit；A transient voltage suppressor is connected between the every differential signal transmission and ground.
- 9. the system of measurement linear accelerator treatment head stop position according to claim 1, it is characterised in that also include Power-fail detection circuit；The power-fail detection circuit, for the supply voltage of detecting system, when the supply voltage power down for the system that detects, then send out Electric signal is given away to the FPGA；The FPGA, for stopping receiving the data signal of the signaling conversion circuit transmission after power-off signal is received.
- 10. the system of measurement linear accelerator treatment head stop position according to claim 4, it is characterised in that described Drive circuit includes：3rd amplifier, the 6th resistance, the 7th resistance and the 4th electric capacity；The first input end of 3rd amplifier connects the excitation analog signal of field circuit output by the 6th resistance；The first input end of 3rd amplifier connects the output end of the 3rd amplifier by the 7th resistance；4th electric capacity is connected in parallel on the both ends of the 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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| 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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| CN111265784A (en) * | 2018-11-20 | 2020-06-12 | 西安大医集团股份有限公司 | Diaphragm position detection device and medical accelerator treatment head |
| CN111552204A (en) * | 2019-02-12 | 2020-08-18 | 株洲中车时代电气股份有限公司 | Resolver simulator based on FPGA |
| CN211561613U (en) * | 2019-11-08 | 2020-09-25 | 西安大医集团股份有限公司 | Motion information tracking device and radiotherapy equipment |
| CN111450423B (en) * | 2020-04-03 | 2021-07-23 | 山东省肿瘤防治研究院（山东省肿瘤医院） | Radiotherapy accelerator capable of rotating in whole circle and using method thereof |
| CN116743025B (en) * | 2023-08-10 | 2024-01-09 | 苏州时代新安能源科技有限公司 | Rotary-changing excitation signal circuit and motor controller |
| CN117442891A (en) * | 2023-12-22 | 2024-01-26 | 智维精准(北京)医疗科技有限公司 | Signal processing method, system and storage medium for linear accelerator |
Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101031241A (en) * | 2004-09-30 | 2007-09-05 | 西门子公司 | Device and method for motorised support of patient positioning |
| CN101847501A (en) * | 2009-03-25 | 2010-09-29 | 爱三工业株式会社 | Resolver |
| CN102291067A (en) * | 2011-08-19 | 2011-12-21 | 联合汽车电子有限公司 | Motor position detecting circuit utilizing isolating type rotating transformer |
| CN102403938A (en) * | 2011-12-14 | 2012-04-04 | 兰州交通大学 | Decoding device and method for rotary transformer based on single FPGA (Field Programmable Gate Array) |
| CN102983803A (en) * | 2012-11-12 | 2013-03-20 | 中冶南方（武汉）自动化有限公司 | Initial positioning method for permanent-magnet synchronous motor |
| JP2013221826A (en) * | 2012-04-16 | 2013-10-28 | Denso Corp | Position sensing device |
| CN103675093A (en) * | 2013-11-22 | 2014-03-26 | 国核电站运行服务技术有限公司 | Pipe detecting system |
| CN204115744U (en) * | 2014-10-31 | 2015-01-21 | 深圳市安瑞吉科技有限公司 | Output signal of rotary transformer conditioning device |
| CN104320024A (en) * | 2014-11-07 | 2015-01-28 | 山东科汇电力自动化股份有限公司 | Position detection system and method for switch reluctance motor |
| CN204269070U (en) * | 2014-12-01 | 2015-04-15 | 杭州湘滨电子科技有限公司 | A kind of change of revolving of measuring permanent-magnet synchronous motor rotor position angle encourages and decoder module |
| CN104819732A (en) * | 2015-05-08 | 2015-08-05 | 深圳市英威腾电动汽车驱动技术有限公司 | Rotary transformer decoding circuit and control method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5001142B2 (en) * | 2005-02-25 | 2012-08-15 | 株式会社日立メディコ | X-ray CT system |
| CN102214489B (en) * | 2011-05-18 | 2013-06-05 | 清华大学 | Rod position measuring device and method |
| CN102680959B (en) * | 2012-05-15 | 2014-04-02 | 中国科学院上海光学精密机械研究所 | Transmitting module of correlated imaging laser radar |
| CN204405543U (en) * | 2014-11-04 | 2015-06-17 | 湖南科技大学 | Rotary Variable multi-angle laser light scattering instrument |
-
2015
- 2015-10-13 CN CN201510676032.8A patent/CN105391368B/en not_active Expired - Fee Related
Patent Citations (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101031241A (en) * | 2004-09-30 | 2007-09-05 | 西门子公司 | Device and method for motorised support of patient positioning |
| CN101847501A (en) * | 2009-03-25 | 2010-09-29 | 爱三工业株式会社 | Resolver |
| CN102291067A (en) * | 2011-08-19 | 2011-12-21 | 联合汽车电子有限公司 | Motor position detecting circuit utilizing isolating type rotating transformer |
| CN102403938A (en) * | 2011-12-14 | 2012-04-04 | 兰州交通大学 | Decoding device and method for rotary transformer based on single FPGA (Field Programmable Gate Array) |
| JP2013221826A (en) * | 2012-04-16 | 2013-10-28 | Denso Corp | Position sensing device |
| CN102983803A (en) * | 2012-11-12 | 2013-03-20 | 中冶南方（武汉）自动化有限公司 | Initial positioning method for permanent-magnet synchronous motor |
| CN103675093A (en) * | 2013-11-22 | 2014-03-26 | 国核电站运行服务技术有限公司 | Pipe detecting system |
| CN204115744U (en) * | 2014-10-31 | 2015-01-21 | 深圳市安瑞吉科技有限公司 | Output signal of rotary transformer conditioning device |
| CN104320024A (en) * | 2014-11-07 | 2015-01-28 | 山东科汇电力自动化股份有限公司 | Position detection system and method for switch reluctance motor |
| CN204269070U (en) * | 2014-12-01 | 2015-04-15 | 杭州湘滨电子科技有限公司 | A kind of change of revolving of measuring permanent-magnet synchronous motor rotor position angle encourages and decoder module |
| CN104819732A (en) * | 2015-05-08 | 2015-08-05 | 深圳市英威腾电动汽车驱动技术有限公司 | Rotary transformer decoding circuit and control method thereof |
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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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