CN206442575U - A kind of medical accelerator close rate stabilization control circuit - Google Patents
A kind of medical accelerator close rate stabilization control circuit Download PDFInfo
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- CN206442575U CN206442575U CN201621437701.2U CN201621437701U CN206442575U CN 206442575 U CN206442575 U CN 206442575U CN 201621437701 U CN201621437701 U CN 201621437701U CN 206442575 U CN206442575 U CN 206442575U
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Abstract
The utility model discloses a kind of medical accelerator close rate stabilization control circuit.It is capable of the conversion of dynamic response close rate in real time using the utility model, and is adjusted by PID, realizes the fast and stable output of close rate.The utility model includes：Serial communication circuit, signal buffers shaping circuit, MCU circuits, signal generating circuit and alarm output circuit, preset value is used as using close rate that the setting of extraneous theme is obtained through serial communication, real-time close rate numerical value is controlled, by by simple subtracter, adder, the pid algorithm device of buffer and multiplier composition, realize that the instantaneous regulation to close rate is controlled, ensure that intergal dose deviation meets requirement and carries out anticipatory control and avoid toning, the frequency for the synchronizing signal that will be exported by change within the specific limits, make real-time close rate numerical value as far as possible equal with preset value.The utility model circuit structure is simple, easily realize.
Description
Technical field
The utility model belongs to the electron linear accelerator technical field that medical treatment and industrial irradiation are applied, and in particular to a kind of
Medical accelerator close rate stabilization control circuit.
Background technology
In the application of middle high energy medical computerized linear accelerator, traditional static treatment to the stability requirement of close rate not
It is high.With the development of radiation therapy technology, the Active treatment modes such as radian treatment and intensity modulated therapy are developed by static treatment, it is right
In different doctor formulas, accelerator is required to the change of dynamic response close rate, and is capable of fast and stable close rate
Output.
Utility model content
In view of this, the utility model provides a kind of medical accelerator close rate stabilization control circuit, with reliability
Well, the advantage such as fast is responded.
Medical accelerator close rate stabilization control circuit of the present utility model, including：Serial communication circuit, signal buffering are whole
Shape circuit, MCU circuits and signal generating circuit；
Wherein, signal buffering shaping circuit receives extraneous incoming real-time dose rate signal and buffered after shaping, sends extremely
MCU circuits；
MCU circuits include integrator, resolver, pid algorithm device and comparator；
Wherein, the resolver is connected by serial communication circuit with main frame, the close rate preset value Y of Receiving Host setting
With adjustable range e, and the reference frequency F of signal generating circuit is calculated according to close rate preset value Y；By close rate preset value Y
Transmit to pid algorithm device, adjustable range e and reference frequency F are sent to comparator；
The real-time dose rate signal that the integrator buffers shaping circuit transmission to signal is integrated computing, obtains in real time
Dosage rate score Xi, and by real-time close rate numerical value XiSend to pid algorithm device；
Pid algorithm device is according to the real-time close rate numerical value X receivediWith close rate preset value Y, the control of close rate is calculated
Value A, and close rate controlling value A is sent to comparator；
The close rate controlling value A received and reference frequency F is compared by comparator, whether judges close rate controlling value A
Beyond adjustable range e：If without departing from frequency value F+A is sent to signal generating circuit；If it was exceeded, by benchmark frequently
The accommodation limit value of rate is sent to signal generating circuit；
The frequency that the signal generating circuit is exported according to comparator produces the pulse signal of fixed pulse width, then pulse is believed
Number it is converted into after differential signal and exports.
Further, the pid algorithm device includes 2 subtracters, 2 buffers, 2 adders and 3 multipliers, its
In, subtracter I receives the Y that the Xi and resolver that integrator sends are sent, and does subtraction, by operation result Xi-Y send to
Multiplier I, after Xi-Y is multiplied by multiplier with scale factor K p, sends to adder II；Subtracter I also receives integrator transmission
Present dose rate score XiWith last dosage rate score Xi-1, and subtraction is done, by present dose rate score and last time
The poor △ X of dosage rate scorei=Xi-Xi-1Send to buffer I and buffer II, buffer I is by △ X1、△X2、…△XiSend
Add operation is done to adder I, and by accumulation result △ X1+△X2+…+△XiSending to multiplier II, multiplier II to add up
As a result after being multiplied with integrating factor Ki, send to adder II；Buffer II is by △ X1、△X2、…△XiSend to subtracter II
Subtraction is done, by the difference △ X of two doses rate deviationi-△Xi-1Send to multiplier III, multiplier III is poor by deviation
After value is multiplied with differential divisor Kd, send to adder III；Adder II is by Kp* (Xi-Y), Ki* (△ X1+△X2+…+△
Xi) and Kd* (△ Xi-△Xi-1) be added after, that is, obtain close rate controlling value A.
Further, in addition to alarm output circuit；The alarm output circuit is connected with comparator, when close rate control
Value A exceeds adjustable range e, and comparator sends alarm number amount to alarm output circuit, and alarm output circuit carries out warning operation.
Further, the pulsewidth for the pulse signal that the signal generating circuit is produced is 1~200 μ s.
The utility model has the advantages that：
1st, the utility model is capable of the conversion of dynamic response close rate in real time, and is adjusted by PID, realizes the fast of close rate
The stable output of speed.
2nd, in the utility model, pid algorithm device is only with simple subtracter, adder, buffer and multiplier, i.e., real
The now instantaneous regulation to close rate, which is controlled, ensure intergal dose deviation meets and requires and carry out anticipatory control and avoid toning,
Circuit is simple, easily realizes.
3rd, in the utility model, the signal that circuit signal generation circuit is produced is believed for the difference of fixed pulse width (1-200us)
Number, precision is high, and antijamming capability is stronger, can avoid the false triggering in the external world.
Brief description of the drawings
Fig. 1 is the structural representation of medical accelerator close rate stabilization control circuit of the present utility model；
Fig. 2 is structural representation (the pid algorithm device group of medical accelerator close rate stabilization control circuit of the present utility model
Into signal)
Fig. 3 is the workflow diagram of medical accelerator close rate stabilization control circuit of the present utility model.
Embodiment
With reference to the accompanying drawings and examples, the utility model is described in detail.
The utility model provides a kind of medical accelerator close rate stabilization control circuit.
As shown in figure 1, the medical accelerator close rate stabilization control circuit includes：Serial communication circuit, signal buffering
Shaping circuit, MCU (single-chip microcomputer) circuit, signal generating circuit and alarm output circuit.
Wherein, signal buffering shaping circuit receives extraneous incoming real-time dose rate signal, and carries out reduction space and electricity
The interference of net, the signal buffered after shaping is sent to MCU circuits.
MCU circuits are mainly made up of integrator, resolver, pid algorithm device and comparator.Wherein, the resolver of MCU circuits
It is connected by serial communication circuit with extraneous main frame, receives the close rate preset value Y and adjustable range e of extraneous host setting, and
The reference frequency F of signal generating circuit is calculated according to close rate preset value Y；Close rate preset value Y is transmitted to pid algorithm
Device, adjustable range e and reference frequency F are sent to comparator；Integrator buffers the real-time dosage that shaping circuit is sent to signal
Rate signal is integrated computing, obtains real-time close rate numerical value Xi, and by real-time close rate numerical value XiSend to pid algorithm device；
Pid algorithm device is according to the real-time close rate numerical value X receivediWith close rate preset value Y, the controlling value A of close rate is calculated, and will
Close rate controlling value A is sent to comparator；The close rate controlling value A received and reference frequency F is compared by comparator, is judged
Whether close rate controlling value A exceeds adjustable range e：If without departing from frequency value F+A is sent to signal generating circuit；Such as
Fruit exceeds, then exports alarm number amount to alarm output circuit, meanwhile, if close rate controlling value A is more than the upper of adjustable range
Limit value, higher limit (F (1+e)) is sent to signal generating circuit；If close rate controlling value A is less than the lower limit of adjustable range
Value, lower limit (F (1-e)) is sent to signal generating circuit.
The frequency that the signal generating circuit is exported according to comparator produces the pulse signal of fixed pulse width (1~200 μ s),
Pulse signal is converted into the stronger differential signal of antijamming capability again as extraneous synchronizing signal.
The alarm number amount that the alarm output circuit is exported according to comparator carries out warning operation, notifies this extraneous circuit
Exceed adjustable range.
Meanwhile, close rate state of a control is sent to extraneous main frame by comparator through resolver.
Wherein, pid algorithm implement body composition is as shown in Fig. 2 including 2 subtracters (I, II), 2 buffers (I, II), 2
Individual adder (I, II) and 3 multipliers (I, II, III), wherein, subtracter I receives the Xi and resolver hair that integrator is sent
The Y sent, and do subtraction, operation result (Xi-Y) is sent to multiplier I, and multiplier is by (Xi-Y) and scale factor K p phases
After multiplying, send to adder II, i.e. the product (Kp* of difference and scale factor between present dose rate score and preset value
(Xi-Y) change for being controlled quick response close rate), can instantaneously be adjusted；Subtracter I also receives the current of integrator transmission
Dosage rate score XiWith last dosage rate score Xi-1, and subtraction is done, by present dose rate score and last close rate
The poor △ X of numerical valuei=Xi-Xi-1Send to buffer I and buffer II, buffer I is by △ X1、△X2、…△XiSend to addition
Device I does add operation, and by accumulation result (△ X1+△X2+…+△Xi) send to multiplier II, multiplier II is by accumulation result
After being multiplied with integrating factor Ki, send to adder II, i.e., the accumulation of each close rate numerical bias and multiply with integrating factor
Product (Ki* (△ X1+△X2+…+△Xi)), it is ensured that the deviation of intergal dose rate, which is met, to be required；Buffer II is by △ X1、△X2、…
△XiSend to subtracter II and do subtraction, by difference (the △ X of two doses rate deviationi-△Xi-1) send to multiplier
III, after deviation difference is multiplied by multiplier III with differential divisor Kd, sends to adder III, i.e. two doses rate deviation
The product of difference and differential divisor, i.e. Kd* (△ Xi-△Xi-1), anticipatory control can be carried out and avoid toning to reach close rate
Stable purpose.Adder II is by (Kp* (Xi-Y)), (Ki* (△ X1+△X2+…+△Xi)) and Kd* (△ Xi-△Xi-1) carry out
After addition, that is, obtain close rate controlling value A.
Thus, it is possible to pass through simple subtracter, adder, buffer and multiplier, you can calculate and obtain PID control
Close rate controlling value A, circuit is simple, easily realizes.
As shown in figure 3, the workflow of this circuit is：
Step 1, close rate is preset：Extraneous main frame regard the dosage rate score of needs as preset value by serial communication circuit
MCU is sent to, MCU resolver calculates reference frequency F according to preset value；
Step 2, synchronizing signal is exported：Signal generating circuit generates the pulse signal of fixed pulse width according to reference frequency, and
Pulse signal is converted into the differential signal for being difficult to be disturbed to export as extraneous synchronizing signal；
Step 3, close rate is calculated：The real-time dose rate signal of MCU circuit countings signal buffering shaping circuit transmission, is obtained
Real-time dosage rate score Xi；
Step 4, relative error：MCU circuits are according to the difference of real-time close rate numerical value and preset value, if difference permits in error
Perhaps in the range of, then do not change the frequency of synchronizing signal, maintain output.If difference exceeds error allowed band, synchronizing signal is changed
Frequency, obtain new frequency values；
Step 5, overshoot is judged：New frequency values are judged whether in the certain limit of reference frequency, without departing from then producing
New synchronizing signal, return to step 2.Exceed, circuit is alarmed, notify external circuitry overshoot, it is another to maintain synchronizing signal to exist
Limiting value in reference range, return to step 2, it is ensured that the output of synchronizing signal.
In summary, preferred embodiment of the present utility model is these are only, is not intended to limit of the present utility model
Protection domain.It is all it is of the present utility model spirit and principle within, any modification, equivalent substitution and improvements made etc. all should be wrapped
It is contained within protection domain of the present utility model.
Claims (4)
1. a kind of medical accelerator close rate stabilization control circuit, it is characterised in that including：Serial communication circuit, signal buffering
Shaping circuit, MCU circuits and signal generating circuit；
Wherein, signal buffering shaping circuit receives extraneous incoming real-time dose rate signal and buffered after shaping, sends to MCU electricity
Road；
MCU circuits include integrator, resolver, pid algorithm device and comparator；
Wherein, the resolver is connected by serial communication circuit with main frame, the close rate preset value Y and tune of Receiving Host setting
Adjusting range e, and calculate according to close rate preset value Y the reference frequency F of signal generating circuit；By close rate preset value Y transmission
To pid algorithm device, adjustable range e and reference frequency F are sent to comparator；
The real-time dose rate signal that the integrator buffers shaping circuit transmission to signal is integrated computing, obtains real-time dosage
Rate score Xi, and by real-time close rate numerical value XiSend to pid algorithm device；
Pid algorithm device is according to the real-time close rate numerical value X receivediWith close rate preset value Y, the controlling value A of close rate is calculated,
And send close rate controlling value A to comparator；
The close rate controlling value A received and reference frequency F is compared by comparator, judges whether close rate controlling value A exceeds
Adjustable range e：If without departing from frequency value F+A is sent to signal generating circuit；If it was exceeded, by reference frequency
Accommodation limit value is sent to signal generating circuit；
The frequency that the signal generating circuit is exported according to comparator produces the pulse signal of fixed pulse width, then pulse signal is turned
Turn to and exported after differential signal.
2. medical accelerator close rate stabilization control circuit as claimed in claim 1, it is characterised in that the pid algorithm device
Including 2 subtracters, 2 buffers, 2 adders and 3 multipliers, wherein, subtracter I receive integrator send Xi and
The Y that resolver is sent, and do subtraction, operation result Xi-Y is sent to multiplier I, and multiplier is by Xi-Y and scale factor
After Kp is multiplied, send to adder II；Subtracter I also receives the present dose rate score X of integrator transmissioniWith last dosage
Rate score Xi-1, and subtraction is done, by the poor △ X of present dose rate score and last dosage rate scorei=Xi-Xi-1Send
To buffer I and buffer II, buffer I is by △ X1、△X2、…△XiSend to adder I and do add operation, and will be cumulative
As a result △ X1+△X2+…+△XiSend to multiplier II, after accumulation result is multiplied by multiplier II with integrating factor Ki, send
To adder II；Buffer II is by △ X1、△X2、…△XiSend to subtracter II and do subtraction, by two doses rate deviation
Difference △ Xi-△Xi-1Send to multiplier III, after deviation difference is multiplied by multiplier III with differential divisor Kd, send extremely
Adder III；Adder II is by Kp* (Xi-Y), Ki* (△ X1+△X2+…+△Xi) and Kd* (△ Xi-△Xi-1) be added
Afterwards, that is, close rate controlling value A is obtained.
3. medical accelerator close rate stabilization control circuit as claimed in claim 1, it is characterised in that also including warning output
Circuit；The alarm output circuit is connected with comparator, and when close rate controlling value A exceeds adjustable range e, comparator is defeated to alarming
Go out circuit and send alarm number amount, alarm output circuit carries out warning operation.
4. medical accelerator close rate stabilization control circuit as claimed in claim 1, it is characterised in that the signal produces electricity
The pulsewidth for the pulse signal that road is produced is 1~200 μ s.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201621437701.2U CN206442575U (en) | 2016-12-26 | 2016-12-26 | A kind of medical accelerator close rate stabilization control circuit |
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| CN201621437701.2U CN206442575U (en) | 2016-12-26 | 2016-12-26 | A kind of medical accelerator close rate stabilization control circuit |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109603016A (en) * | 2018-12-14 | 2019-04-12 | 江苏海明医疗器械有限公司 | A kind of medical accelerator dosage rate stabilizing control system |
| CN109758678A (en) * | 2018-12-14 | 2019-05-17 | 江苏海明医疗器械有限公司 | A kind of medical accelerator dosage rate stable control method |
| CN110678717A (en) * | 2017-06-05 | 2020-01-10 | 日立汽车系统株式会社 | Air flow meter |
-
2016
- 2016-12-26 CN CN201621437701.2U patent/CN206442575U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110678717A (en) * | 2017-06-05 | 2020-01-10 | 日立汽车系统株式会社 | Air flow meter |
| CN110678717B (en) * | 2017-06-05 | 2020-12-18 | 日立汽车系统株式会社 | Air flow meter |
| CN109603016A (en) * | 2018-12-14 | 2019-04-12 | 江苏海明医疗器械有限公司 | A kind of medical accelerator dosage rate stabilizing control system |
| CN109758678A (en) * | 2018-12-14 | 2019-05-17 | 江苏海明医疗器械有限公司 | A kind of medical accelerator dosage rate stable control method |
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