CN108923653B - A kind of medical electric rifle grid power supply - Google Patents
A kind of medical electric rifle grid power supply Download PDFInfo
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- CN108923653B CN108923653B CN201810737305.9A CN201810737305A CN108923653B CN 108923653 B CN108923653 B CN 108923653B CN 201810737305 A CN201810737305 A CN 201810737305A CN 108923653 B CN108923653 B CN 108923653B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/22—Conversion of dc power input into dc power output with intermediate conversion into ac
- H02M3/24—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters
- H02M3/28—Conversion of dc power input into dc power output with intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate ac
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/14—Arrangements for reducing ripples from dc input or output
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M3/00—Conversion of dc power input into dc power output
- H02M3/02—Conversion of dc power input into dc power output without intermediate conversion into ac
- H02M3/04—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters
- H02M3/10—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M3/145—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M3/155—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M3/156—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
- H02M3/158—Conversion of dc power input into dc power output without intermediate conversion into ac by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/02—Circuits or systems for supplying or feeding radio-frequency energy
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/0045—Converters combining the concepts of switch-mode regulation and linear regulation, e.g. linear pre-regulator to switching converter, linear and switching converter in parallel, same converter or same transistor operating either in linear or switching mode
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05H—PLASMA TECHNIQUE; PRODUCTION OF ACCELERATED ELECTRICALLY-CHARGED PARTICLES OR OF NEUTRONS; PRODUCTION OR ACCELERATION OF NEUTRAL MOLECULAR OR ATOMIC BEAMS
- H05H7/00—Details of devices of the types covered by groups H05H9/00, H05H11/00, H05H13/00
- H05H7/02—Circuits or systems for supplying or feeding radio-frequency energy
- H05H2007/022—Pulsed systems
Abstract
The present invention provides a kind of medical electric rifle grid power supplies, including voltage control module, grid impulse power supply, negative pressure linear power supply, grid modulator and grid output circuit；Voltage control module is the power supply of each circuit, and outputting reference voltage, modulation pulse give grid impulse power supply, while correcting the modulation pulse of output by feedback signal；Grid impulse power supply uses Switching Power Supply, linear power supply combinatorial topology form, and received reference voltage is adjusted as desired and then exports forward voltage to grid modulator；Grid modulator output end connects negative pressure linear power supply, and control is passed to the on-off of the forward voltage load of negative pressure linear power supply by grid impulse power supply；Grid output circuit is given in output after negative pressure linear power supply is superimposed with received forward voltage；Grid output circuit input terminal is connected with negative pressure linear power supply, and output end is connected with grided electron gun grid.The present invention has the advantages that the positive negative output of wide-range, low noise, low ripple, amplitude controllable precise.
Description
Technical field
The present invention relates to power technique fields, and in particular to a kind of medical electric rifle grid power supply.
Background technique
Middle high energy medical computerized linear accelerator can provide the treatment beam of two kinds of different modes of electric wire and X-ray, often
Kind treatment beam is segmented into different energy class again；Electric wire is used to treat the tumour of shallow-layer, and X-ray is swollen for treating deep layer
Tumor.By the appropriate weighted array of the treatment beam of different mode and energy, so that dosage distribution is more nearly the shape of lesion, can be improved and control
Therapeutic effect.
In the application of middle high energy medical computerized linear accelerator, the grided electron gun that can stablize transmitting controllable beam is to be
The important component of system.For the multiple-working mode for meeting system, electron gun emission current needs wide scope (1~500mA)
It adjusts, corresponding grid power supply need to be matched, and especially in low-grade electric wire, emission current requirement is smaller, grid power supply
Stability and ripple are particularly critical.Need to design a kind of grid power supply and its modulation circuit, the high stability that generates, low ripple
Grid power supply, to guarantee that the output of stablizing of electron gun emission current is adjusted with accurate.
High energy medical computerized linear accelerator at present, grid power supply use Switching Power Supply system, and output voltage adjusts model
It encloses for (3V~300V), cannot achieve the output of 0V and negative voltage；Especially under low-grade electric wire application, switching noise
And ripple, it causes practical control sensitivity and the deficient validity, in actual use, sets rated value for electron gun grid power supply
1% (3V), then control and adjust beam intensity by timely adjustment electron gun filament voltage (equivalent adjusting cathode temperature).
The shortcomings that prior art, mainly shows as follows:
(1) electron gun emission current (especially under low-grade electric wire) cannot stablize output and it is accurate adjust, can not be
Multi-operation mode of uniting exactly matches；
(2) electron gun filament voltage is adjusted to control emission current, it will is caused gun cathode to be poisoned, is seriously affected electricity
Sub- rifle service life；
(3) due to the limitation of electron gun temperature thermal inertia, emission current dynamic response is slow, is unable to satisfy the more Working moulds of system
The requirement that formula is quickly adjusted.
Summary of the invention
In view of this, there is the positive negative output of wide-range, low noise the present invention provides a kind of medical electric rifle grid power supply
The advantages of sound, low ripple, amplitude controllable precise.
A specific embodiment of the invention is as follows:
A kind of medical electric rifle grid power supply, including voltage control module, grid impulse power supply, negative pressure linear power supply, grid
Pole modulator and grid output circuit；
The voltage control module is the power supply of each circuit, and outputting reference voltage, modulation pulse give grid impulse power supply, together
When correct the modulation pulse of output by feedback signal, the feedback signal is according to receiving external sampling signal and gate-controlled electron
The pulse pair ratio of rifle grid load obtains；
The grid impulse power supply uses Switching Power Supply, linear power supply combinatorial topology form, is adjusted as desired received
Then reference voltage exports forward voltage to grid modulator；
The grid modulator output end connects negative pressure linear power supply, for modulating the modulation pulse, controls by grid
The pulse power passes to the on-off of the forward voltage load of negative pressure linear power supply；
The negative pressure linear power supply is for exporting definite value negative pressure, and output is exported to grid after being superimposed with received forward voltage
Circuit；
The grid output circuit input terminal is connected with negative pressure linear power supply, and output end is connected with grided electron gun grid,
For protecting grided electron gun grid.
Further, the voltage control module includes: low-pressure side control module, isolated transmission module and high-pressure side control
Molding block, low-pressure side control module, isolated transmission module, high-pressure side control module are sequentially connected in series；
Primary power is transformed to power pulse through low-pressure side control module, and isolated transmission module primary side, low pressure are given in output
Side control module receives the pulse feedback signal loaded from external sampling signal and grided electron gun grid, and by reference pulse
It exports with modulation pulse to isolated transmission module primary side；
Isolated transmission module is for the power between low-pressure side control module and high-pressure side control module and the isolation of pulse
Transmission；High-pressure side control module is each circuit power supply in high-pressure side, and reference pulse exports after F/V is converted and gives grid impulse power supply,
The demodulated output of pulse is modulated to grid modulator, while receiving the fault-signal from each circuit in high-pressure side and generating failure letter
It feels the pulse punching, and fault-signal pulse is transmitted to low-pressure side control module by isolated transmission module.
Further, the grid power supply further includes negative bias voltage source, and back bias voltage power input and high-pressure side control mould
Block is connected, and output end is connected with grid modulator, for generating the blanking voltage during the pulse spacing.
Further, the grid modulator recommends feeding mode using biswitch, including opens pipe and truncation pipe, described
It opens pipe to be connected with grid impulse power supply, the truncation pipe is connected with negative bias voltage source.
Further, the grid impulse power supply includes semi-bridge alternation circuit, transformer, the first current rectifying and wave filtering circuit, string
Join adjustment circuit, the second filter circuit, semi-bridge alternation control circuit, linear voltage drop sample circuit, adjustment pipe control circuit and defeated
Voltage and current sample circuit out；
The semi-bridge alternation circuit, transformer, the first current rectifying and wave filtering circuit, series control circuit, the second filter circuit according to
The input terminal of secondary series connection, the linear voltage drop sample circuit is connected with series control circuit, output end and semi-bridge alternation control electricity
The input terminal on road is connected, and the output end of the semi-bridge alternation control circuit is connected with semi-bridge alternation circuit, the output voltage electricity
Stream sample circuit is connected with series control circuit, and output end is connected with the input terminal of adjustment pipe control circuit, the adjustment control
The output end of circuit processed is connected with series control circuit；
Linear voltage drop sample circuit carries out linear voltage drop sampling, output to semi-bridge alternation control to the output of series control circuit
Circuit processed after carrying out margin of error calculating, generates pwm pulse driving signal, semi-bridge alternation circuit is given in output, through transformer, first
Current rectifying and wave filtering circuit generates pre- steady DC voltage, meanwhile, the pre- steady DC voltage is concatenated adjustment circuit, the second filter circuit
After export forward voltage；The voltage and current that the output voltage current sampling circuit exports the second filter circuit samples,
It exports and gives adjustment pipe control circuit, adjustment pipe control circuit carries out error meter with the reference voltage from voltage control module
It calculates, generates adjustment pipe drive voltage signal, output completes linear voltage stabilization control to series control circuit.
Further, the negative pressure linear power supply include resistance R71, resistance R72, resistance R73, resistance R74, resistance R75,
Resistance R76, resistance R77, resistance R78, capacitor C71, capacitor C72, capacitor C73, diode V71, diode V72, diode
V73, diode V74, metal-oxide-semiconductor V75, triode V76, zener diode V77, zener diode V78 and a reference source；
Diode V71, diode V72, diode V73, diode V74 form bridge rectifier, output end and resistance
The one end R71 is connected, and the other end of resistance R71 is connect with one end of resistance R72, resistance R73 and resistance R74, and resistance R71's is another
End is connect with the drain electrode of the anode of capacitor C71, metal-oxide-semiconductor V75 simultaneously；The one of the other end of resistance R72 and resistance R77, capacitor C73
End connection, the anode as power supply output；The other end of resistance R77 is connect with one end of resistance R76, resistance R78, and and benchmark
The feedback end in source connects；The other end of resistance R78 and capacitor C73, a reference source anode connect power supply output negative terminal；Resistance R76
The other end connect with capacitor C72, be connected in parallel between the feedback end of a reference source and cathode；The cathode of a reference source while and resistance
The cathode connection of the other end of R73, the base stage of triode V76, zener diode V78；The emitter of triode V76 simultaneously with electricity
Hinder the cathode connection of the other end, zener diode V77 of R74；The collector of triode V76 simultaneously with one end of resistance R75,
The grid of metal-oxide-semiconductor V75 connects；The anode of zener diode V77 and zener diode V78, the other end of resistance R75, capacitor C71
Negative terminal, metal-oxide-semiconductor V75 source electrode simultaneously connect power supply output negative terminal.
Further, the low-pressure side control module includes accessory power supply, signal interface circuit, signal isolation circuit, string
Mouth level shifting circuit, MCU microprocessor and pulse signal modulation circuit；
The signal isolation circuit, signal interface circuit, MCU microprocessor are sequentially connected in series, the pulse signal modulation electricity
Road is connected with signal isolation circuit, MCU microprocessor respectively, and the serial port level chance-over circuit is connected with MCU microprocessor；
Accessory power supply is converted through DC/DC, is powered for low-pressure control module circuit, is converted through DC/AC, and power pulse is generated；
Signal isolation circuit for carrying out isolation and level conversion processing to signal, and carries out V/F transformation, F/V through signal interface circuit
MCU microprocessor is given in transformation, output；MCU microprocessor is grid according to system operating mode, emission current and ray energy
The voltage reference pulse of pulse power offer different frequency；Pulse signal modulation circuit, in conjunction with outer lock-out pulse, microwave detection packet
Network, grid profiled pulses carry out dynamic adjustment to the delay of modulated pulse signal；Serial port level chance-over circuit is realized and outside
Control system communication, working condition and real time data are uploaded, and carry out remote monitoring and control.
The utility model has the advantages that
1, the present invention uses the grid power supply of switched linear combinatorial topology, combines the efficient and linear power supply of Switching Power Supply
Low noise, low ripple, electron gun emission current (especially under low-grade electric wire) can stablize output and it is accurate adjust, with system
Multi-operation mode exact matching；Electron gun filament power supply realizes pressure stabilizing work, changes and relies on filament voltage adjusting beam intensity
Control mode, ensure that electron gun service life, and cascade negative pressure linear power supply, realize grid impulse voltage wide scope tune
Section.
2, voltage control module of the present invention includes low-pressure side control module, isolated transmission module and high-pressure side control mould
Block, the pulse delay of amendment modulation in real time guarantee that line can be in specified microwave detection packet to be adapted dynamically beam burst timing
It is injected during network, keeps system dynamic response fast, a variety of Working moulds of middle high energy medical computerized linear accelerator can be rapidly adapted to
Formula requirement；Secondly, fault-signal pulse is transferred to external control system by low-pressure side control module, realize that grid impulse is quick
Shutdown and high voltage interlock defencive function achieve the purpose that protect grid power supply and electron gun.
3, biswitch modulator of the present invention, readily available preferable impulse waveform, repetition easy to accomplish and pulsewidth it is quick
Variation, the caused oscillation of distribution parameter is small, reduces the influence to electron gun.
4, switch voltage-stabilizing part of the present invention realizes the coarse adjustment of grid impulse power supply, linear voltage stabilization portion by changing duty ratio
Divide the fine tuning that grid impulse power supply is realized by adjusting tube voltage drop, two-stage pressure stabilizing realizes Ug power supply (0V~350V) and continuously may be used
It adjusts.
5, grid output circuit circuit design of the present invention is simple, and cost is relatively low, and output noise is low, ripple is small.
Detailed description of the invention
Fig. 1 is the functional block diagram of grid power supply of the present invention；
Fig. 2 is the circuit block diagram of low-pressure side control module of the present invention；
Fig. 3 is the circuit block diagram of high-pressure side control module of the present invention；
Fig. 4 is the circuit block diagram of grid impulse power supply of the present invention；
Fig. 5 is the circuit block diagram of the present invention -50V linear power supply；
Fig. 6 is the circuit block diagram of grid modulator of the present invention；
Fig. 7 is the circuit block diagram of grid output circuit of the present invention.
Wherein, 1- low-pressure side control module, 2- isolated transmission module, the high-pressure side 3- control module, 4- grid impulse power supply,
5- negative bias voltage source, 6- grid modulator, 7- negative pressure linear power supply, 8- grid output circuit, 9- grided electron gun grid, 11-
Accessory power supply, 12- signal interface circuit, 13- signal isolation circuit, 14- serial port level chance-over circuit, 15-MCU microprocessor,
16- pulse signal modulation circuit, 31- accessory power supply, 32- hardware logic protect circuit, 33- signal interface circuit, 34- pulse letter
Number demodulator circuit, 41- semi-bridge alternation circuit, 42- transformer, the first current rectifying and wave filtering circuit of 43-, 44- series control circuit, 45-
Second filter circuit, 46- semi-bridge alternation control circuit, 47- linear voltage drop sample circuit, 48- adjust pipe control circuit, and 49- is defeated
Voltage and current sample circuit out, 61- open tube drive circuit, 62- truncation tube drive circuit.
Specific embodiment
The present invention will now be described in detail with reference to the accompanying drawings and examples.
The present invention provides a kind of medical electric rifle grid power supplies, as shown in Figure 1, including low-pressure side control module 1, isolation
Transmission module 2, high-pressure side control module 3, grid impulse power supply 4, negative bias voltage source 5, grid modulator 6, negative pressure linear power supply 7
With grid output circuit 8.
Low-pressure side control module 1, isolated transmission module 2, high-pressure side control module 3 are sequentially connected in series；High-pressure side control module 3
Output end simultaneously be connected with grid impulse power supply 4, negative bias voltage source 5, grid modulator 6；Grid impulse power supply 4, back bias voltage
What power supply 5 was separately connected grid modulator 6 opens pipe and truncation pipe；Grid modulator 6, negative pressure linear power supply 7, grid output electricity
Road 8 is sequentially connected in series, and the output end of grid output circuit 8 is connected with grided electron gun grid 9.
Low-pressure side control module 1, for generating power pulse, voltage reference pulse, modulation pulse；Circuit block diagram such as Fig. 2
It is shown, it is the full digital stored program controlled based on micro-control unit MCU (Microcontroller Unit) for core, including auxiliary
Help power supply 11, signal isolation circuit 13, signal interface circuit 12, MCU microprocessor 15, pulse signal modulation circuit 16 and with string
Mouth level shifting circuit 14.
Working process and principle: accessory power supply 11 utilizes primary power+24V, converts through DC/AC generate AC40V/ all the way
40kHz high frequency power pulse, this high frequency power pulse are transmitted to high-pressure side control module 3 through isolated transmission module 2, are each module
Work provides required power supply, low-tension supply (D ± 12V, D needed for another way converts generation lower-voltage circuit work through DC/DC
+ 5V etc.).
Signal isolation circuit 13 mainly completes the isolation and level conversion to sampled signal, output signal, to inhibit electronics
The strong pulse interference of linear accelerator.Sampled signal include Ug voltage feedback signal ,-Eg voltage feedback signal, fault-signal and
Grid profiled pulse signal, output signal include Ug voltage reference and modulation pulse, complete letter with Phototube Coupling or Magnetic isolation
Number isolation, output is to signal interface circuit 12.Ug represents positive voltage, and-Eg represents negative voltage.
Signal interface circuit 12 mainly completes the V/F transformation of reference pulse and the F/V of voltage signal is converted, and benchmark is sent out
The Ug reference pulse of raw circuit setting and modulation pulse are sent to high_voltage isolation transmission transformer primary side, while will be through high_voltage isolation
Ug voltage signal ,-Eg voltage signal and the grid impulse envelope signal of transmission transformer isolation, send to sampled signal and electricity are isolated
Road.
MCU microprocessor 15 is the core of control module, mainly completes following functions:
1) voltage reference of Ug power supply is generated.It is received adopts from external operating mode system requirements, electron gun line
The above signal is carried out integrated treatment, provides suitable grid power supply reference signal, produced by sample signal and ray energy sampled signal
The voltage reference of raw different frequency, the grid impulse voltage of dynamic adjustment in real time reach the mesh of accurate control electron gun emission current
's.
2) the adjustable modulation pulse that is delayed is generated.According to pulse information comparing result, pulse delay is modulated in amendment in real time, from
And it is adapted dynamically beam burst timing, so that control line is injected during specified microwave detected envelope.
3) serial communication.Communication through serial port level chance-over circuit 14 Yu external control system, using standard RS485 serial ports
Working condition and real time data are uploaded, realize the remote monitoring and control to electron gun grid power supply and modulation circuit.
4) output of the pulse enable signal determining modulation pulse outside receiving.
Pulse signal modulation circuit 16, receives from external outer lock-out pulse, microwave detected envelope, in conjunction with it is sampled every
From grid profiled pulse signal carry out shape information comparing calculation, send result to MCU microprocessor 15, and to revised arteries and veins
It rushes signal to be modulated, modulated pulse signal is exported through signal isolation circuit 13 to isolated transmission module 2.
High-pressure side control module 3, for generate accessory power supply, voltage reference, demodulation pulse, circuit block diagram as shown in figure 3,
Including accessory power supply 31, hardware logic protection circuit 32, signal interface circuit 33 and pulse signal demodulator circuit 34.
Working process and principle: the AC40V/40kHz high frequency power arteries and veins that accessory power supply 31 is inputted using isolated transmission module
Punching, completes AC/DC all the way and converts generation A+24V, provides required power supply for the work of each module, then convert through DC/DC and generate height
Low-tension supply (A ± 12V) needed for pressing lateral circuit work, another way is then transformed to the exchange input of negative pressure linear power supply 7, through grid
Pole modulator 6 flows into negative pressure linear power supply 7.
Hardware logic protects circuit 32 to have perfect fault detection defencive function, when each circuit in high-pressure side such as Ug power supply mistake
When any failures such as pressure, the sparking of-Eg line under-voltage, grid occur, pulse blocking is exported to pulse signal demodulator circuit 34 first
Signal, reprocessing generate fault-signal pulse, are transmitted by isolated transmission module 2 and are sent into low-pressure side control module 1, pass through detection
Down pulse is whether there is or not judging grid power supply and modulation circuit state, the promising normal condition of down pulse, down pulse inaction therefore
Malfunction is transferred to external system failure UNPROFOR loop by barrier state, is realized that grid impulse is rapidly switched off and is protected with high voltage interlock
Protective function achievees the purpose that protect grid power supply and electron gun.Signal interface circuit 33 completes the F/V of Ug power reference pulse
Transformation, the V/F transformation of Ug supply voltage, the V/F transformation of-Eg supply voltage and the Shape correction of profiled pulses sampled signal；By
High in isolating transformer isolation current potential, leakage inductance is larger, and wave distortion is serious, using Schmidt trigger to the reference pulse of input
Shaping, clipping, clamper processing have been carried out, anti-interference ability is improved.Pulse signal demodulator circuit 34, to modulated pulse signal into
Row demodulation, isolates and opens pulse and truncation pulse, opens pipe and truncation pipe for drive grid modulator 6.
Isolated transmission module 2 is described in detail in conjunction with FIG. 1 to FIG. 3.
Isolated transmission module 2 is for the power and pulse signal between low-pressure side control module 1 and high-pressure side control module 3
Isolation transmission, including the pulse of AC40V/40kHz high frequency power, voltage reference pulse, Voltage Feedback pulse, grid profiled pulses,
Modulation pulse and fault-signal pulse, this module are made of seven high frequency high-isolating transformers, and primary and secondary isolation voltage is not
Lower than 70kV.
Each component part in high-pressure side is described in detail below with reference to Fig. 1, Fig. 4~Fig. 7.
Grid impulse power supply 4:
As shown in figure 4, grid impulse power supply 4 is generated and is exported in adjustable arteries and veins just for being converted according to system requirements
It is filtered to voltage Ug, including semi-bridge alternation circuit 41, transformer 42, the first current rectifying and wave filtering circuit 43, series control circuit 44, second
Wave circuit 45, semi-bridge alternation control circuit 46, linear voltage drop sample circuit 47, adjustment pipe control circuit 48 and output voltage electric current
Sample circuit 49.
Linear voltage drop sample circuit 47 carries out linear voltage drop sampling, output to half bridging to the output of series control circuit 44
Control circuit 46 is changed, after carrying out margin of error calculating, pwm pulse driving signal is generated, exports to semi-bridge alternation circuit 41, through transformation
Device 42, the first current rectifying and wave filtering circuit 43 generate pre- steady DC voltage, and thus switch voltage-stabilizing part is realized by changing duty ratio
The coarse adjustment of grid impulse power supply 4, meanwhile, pre- steady DC voltage exports after series control circuit 44, the second filter circuit 45
The grid impulse power supply of low noise, low ripple；The voltage that output voltage current sampling circuit 49 exports the second filter circuit 45
Electric current is sampled, and adjustment pipe control circuit 48 is given in output, and adjustment pipe control circuit 48 and Ug reference voltage carry out error meter
It calculates, generates adjustment pipe drive voltage signal, output completes linear voltage stabilization control to series control circuit 44.Linear voltage stabilization part
The fine tuning of grid impulse power supply 4 is realized by adjusting tube voltage drop, two-stage pressure stabilizing realizes Ug power supply (0V~350V) and continuously may be used
It adjusts.The combinatorial topology of switch, linear power supply, combines low noise, the low ripple of the efficient and linear power supply of Switching Power Supply.
Preferably, semi-bridge alternation control circuit 46, which controls chip, uses loop Current-type PWM Controller UC3856.
Preferably, series control circuit 44, which adjusts pipe, uses N-channel MOS pipe STP12NM50N.
Preferably, the second filter circuit 45 uses π type filter circuit.
Negative bias voltage source 5:
5 input terminal of negative bias voltage source is connected with high-pressure side control module 3, and output end is connected with grid modulator 6, for producing
Blanking voltage-Eg during the raw pulse spacing, since stability requirement of the grid to negative bias voltage source 5 be not high, back bias voltage
Power supply is set as -650V, using recommending electric source topology, and is generated using voltage multiplying rectifier filter circuit.To guarantee electron gun grid
Reliable cut-off, when negative bias voltage source be lower than set threshold value when, submitting-Eg under-voltage fault, prevent damage electron gun.
Grid modulator 6:
Grid modulator 6 is used to modulate the modulation pulse control forward voltage of input or the load of negative pressure, including opens pipe
Driving circuit 61, truncation tube drive circuit 62, switching tube V61, switching tube V62, switching tube V63, switching tube V64, diode
V65, resistance R61, resistance R62, resistance R63, resistance R64, resistance R65, resistance R66, capacitor C61 and capacitor C62.
Pulse and truncation pulse are opened in the demodulation modulation pulse generation of high-pressure side control module 3, are respectively fed to open pipe driving
Circuit 61 and truncation tube drive circuit 62, for driving opening and truncation metal-oxide-semiconductor for grid modulator 6；Modulator main switch electricity
Pipe is opened using biswitch in road, truncation pipe recommends feed form, generates grid modulation pulse；It opens pipe i.e. switching tube V62, open
It closes pipe V61 and truncation pipe, that is, switching tube V63, switching tube V64 selects two power MOS pipes to be used in series, preferably, using
2SK1317.Pipe conducting is opened during pulsed operation, the shutdown of truncation pipe loads forward voltage；Pipe pass is opened during pulse spacing
Disconnected, the conducting of truncation pipe loads negative pressure；Truncation pipe is connected under pulse-off state, and grid voltage is placed in negative bias piezoelectricity at this time
The voltage in source 5, it is ensured that electron gun grid is in effective off state.Capacitor C61, C62 are respectively the energy storage electricity of Ug ,-Eg power supply
Hold, the pulse top drop of grid modulator 6 can be reduced.Resistance R61~R64, for the current-limiting resistance for limiting metal-oxide-semiconductor electric current, V65, R65
And R66 constitutes profiled pulses sample circuit, completes the waveform sampling of grid impulse, provides reference for pulse sequence adjustment.
The linear power supply of 7 use -50V of negative pressure linear power supply:
- 50V linear power supply is used to generate the linear power supply of the fixed output of -50V, including resistance R71, resistance R72, resistance
R73, resistance R74, resistance R75, resistance R76, resistance R77, resistance R78, capacitor C71, capacitor C72, capacitor C73, diode
V71, diode V72, diode V73, diode V74, metal-oxide-semiconductor V75, triode V76, zener diode V77, zener diode
V78 and a reference source U1.
The high-frequency ac of AC80V/40kHz is through diode V71~V74 composition bridge rectifier rectification, and output about 70V is not
Steady DC voltage, resistance R71, capacitor C71 and resistance R72, capacitor C73 composition RC filter network output；Output voltage is through resistance
R77, resistance R78 complete partial pressure feedback, carry out margin of error calculating, the wave of output voltage with the built-in a reference value 2.5V of a reference source U1
The dynamic voltage value that will affect a reference source U1 cathode, then the conducting resistance of triode V76 will become larger, because resistance R75 is attempted by MOS
Between pipe V75 grid and source electrode, then the conducting voltage of metal-oxide-semiconductor V75 changes correspondingly, so that the fluctuation of output voltage is compensated for, it is complete
At the pressure stabilizing of -50V linear power supply.
Preferably, a reference source U1 uses TI company precision a reference source TL431.
Preferably, triode V76 uses PNP pipe S8550.
Preferably, zener diode V77 uses ZMM12.
Preferably, zener diode V78 uses ZMM15.
Preferably, metal-oxide-semiconductor V75 uses N-channel MOS pipe IRFP640.
Grid output circuit 8:
Protection for grid output pulse will generate between grid and cathode if electron gun grid is struck sparks over the ground
The Instantaneous high-pressure of 70kV can often make to open pipe and the breakdown of truncation pipe in modulator circuit, can also cause grid loss.Therefore exist
Grid designing circuitry has yin-gate voltage peak restrained protection circuit, using varistor R84, R85, spark discharger
VE81, VE82 and high pressure ceramic disc capacitor C81 protect 4 metal-oxide-semiconductor V61~V64 in 6 circuit of grid modulator, can also be effective
Protect the grid of electron gun not damaged in ground.Resistance R81 is noninductive current-limiting resistance, in electron gun sparking, is born to electron gun
Energy limited, generally select 50~100 ohm.Current transformer TA81, the signal for electron gun grid sparking are adopted
Sample, when failure, are able to achieve grid impulse and rapidly switch off.Circuit be provided with back bias voltage direct current tie line, by resistance R82,
R83 send back bias voltage voltage to grid, is in order to when truncation pipe fault is unable to normally in this way, it is ensured that grid output
Back bias voltage voltage is normal.
In conclusion the above is merely preferred embodiments of the present invention, being not intended to limit the scope of the present invention.
All within the spirits and principles of the present invention, any modification, equivalent replacement, improvement and so on should be included in of the invention
Within protection scope.
Claims (7)
1. a kind of medical electric rifle grid power supply, which is characterized in that including voltage control module, grid impulse power supply (4), negative pressure
Linear power supply (7), grid modulator (6) and grid output circuit (8)；
The voltage control module is the power supply of each circuit, and outputting reference voltage, modulation pulse give grid impulse power supply (4), together
When correct the modulation pulse of output by feedback signal, the feedback signal is according to receiving external sampling signal and gate-controlled electron
The pulse pair ratio of rifle grid (9) load obtains；
The grid impulse power supply (4) uses Switching Power Supply, linear power supply combinatorial topology form, and received base is adjusted as desired
Then quasi- voltage exports forward voltage and gives grid modulator (6)；
Grid modulator (6) output end connects negative pressure linear power supply (7), for modulating the modulation pulse, controls by grid
The pole pulse power (4) passes to the on-off of the forward voltage load of negative pressure linear power supply (7)；
The negative pressure linear power supply (7) is for exporting definite value negative pressure, and output is exported to grid after being superimposed with received forward voltage
Circuit (8)；
Grid output circuit (8) input terminal is connected with negative pressure linear power supply (7), output end and grided electron gun grid (9)
It is connected, for protecting grided electron gun grid (9).
2. medical electric rifle grid power supply as described in claim 1, which is characterized in that the voltage control module includes: low
Side control module (1), isolated transmission module (2) and high-pressure side control module (3) are pressed, low-pressure side control module (1), isolation pass
Defeated module (2), high-pressure side control module (3) are sequentially connected in series；
Primary power is transformed to power pulse through low-pressure side control module (1), and isolated transmission module (2) primary side is given in output, low
Side control module (1) is pressed to receive the pulse feedback signal loaded from external sampling signal and grided electron gun grid (9), and will
Reference pulse and modulation pulse are exported to isolated transmission module (2) primary side；
Isolated transmission module (2) between low-pressure side control module (1) and high-pressure side control module (3) power and pulse
Isolation transmission；High-pressure side control module (3) is each circuit power supply in high-pressure side, and reference pulse exports after F/V is converted and gives grid arteries and veins
It rushes power supply (4), the demodulated output of modulation pulse is given grid modulator (6), while receiving the failure from each circuit in high-pressure side
Signal generates fault-signal pulse, and fault-signal pulse is transmitted to low-pressure side control module by isolated transmission module (2)
(1)。
3. medical electric rifle grid power supply as described in claim 1, which is characterized in that the grid power supply further includes back bias voltage
Power supply (5), negative bias voltage source (5) input terminal are connected with high-pressure side control module (3), and output end is connected with grid modulator (6),
For generating the blanking voltage during the pulse spacing.
4. medical electric rifle grid power supply as claimed in claim 3, which is characterized in that the grid modulator (6) is using double
Switch push-pull feeding mode, including pipe and truncation pipe are opened, the pipe of opening is connected with grid impulse power supply (4), the truncation
Pipe is connected with negative bias voltage source (5).
5. medical electric rifle grid power supply as described in claim 1, which is characterized in that the grid impulse power supply (4) includes
Semi-bridge alternation circuit (41), transformer (42), the first current rectifying and wave filtering circuit (43), series control circuit (44), the second filtered electrical
Road (45), semi-bridge alternation control circuit (46), linear voltage drop sample circuit (47), adjustment pipe control circuit (48) and output voltage
Current sampling circuit (49)；
The semi-bridge alternation circuit (41), transformer (42), the first current rectifying and wave filtering circuit (43), series control circuit (44),
Two filter circuits (45) are sequentially connected in series, input terminal and series control circuit (44) phase of the linear voltage drop sample circuit (47)
Even, output end is connected with the input terminal of semi-bridge alternation control circuit (46), the output end of the semi-bridge alternation control circuit (46)
It is connected with semi-bridge alternation circuit (41), the output voltage current sampling circuit (49) is connected with the second filter circuit (45), defeated
Outlet with adjustment pipe control circuit (48) input terminal be connected, it is described adjustment pipe control circuit (48) output end with connect adjust
Circuit (44) is connected；
Linear voltage drop sample circuit (47) carries out linear voltage drop sampling, output to half bridging to the output of series control circuit (44)
It changes control circuit (46), after carrying out margin of error calculating, generates pwm pulse driving signal, output is given semi-bridge alternation circuit (41), is passed through
Transformer (42), the first current rectifying and wave filtering circuit (43) generate pre- steady DC voltage, meanwhile, the pre- steady DC voltage is concatenated tune
Whole circuit (44), the second filter circuit (45) export forward voltage afterwards；The output voltage current sampling circuit (49) is to second
The voltage and current of filter circuit (45) output is sampled, and output adjusts pipe control circuit to adjustment pipe control circuit (48)
(48) with from voltage control module reference voltage carry out margin of error calculating, generate adjustment pipe drive voltage signal, export to
Series control circuit (44) completes linear voltage stabilization control.
6. medical electric rifle grid power supply as described in claim 1, which is characterized in that the negative pressure linear power supply (7) includes
Resistance R71, resistance R72, resistance R73, resistance R74, resistance R75, resistance R76, resistance R77, resistance R78, capacitor C71, capacitor
C72, capacitor C73, diode V71, diode V72, diode V73, diode V74, metal-oxide-semiconductor V75, triode V76, pressure stabilizing two
Pole pipe V77, zener diode V78 and a reference source；
Diode V71, diode V72, diode V73, diode V74 form bridge rectifier, output end and resistance R71 mono-
End is connected, and the other end of resistance R71 is connect with one end of resistance R72, resistance R73 and resistance R74, and the other end of resistance R71 is same
When connect with the drain electrode of the anode of capacitor C71, metal-oxide-semiconductor V75；The other end and resistance R77 of resistance R72, one end of capacitor C73 connect
It connects, the anode as power supply output；The other end of resistance R77 is connect with one end of resistance R76, resistance R78, and with a reference source
Feedback end connection；The other end of resistance R78 and capacitor C73, a reference source anode connect power supply output negative terminal；Resistance R76's is another
One end is connected with capacitor C72, is connected in parallel between the feedback end of a reference source and cathode；The cathode of a reference source is simultaneously with resistance R73's
The cathode connection of the other end, the base stage of triode V76, zener diode V78；The emitter of triode V76 simultaneously with resistance R74
The other end, zener diode V77 cathode connection；The collector of triode V76 while one end with resistance R75, metal-oxide-semiconductor
The grid of V75 connects；The anode of zener diode V77 and zener diode V78, the other end of resistance R75, capacitor C71 it is negative
It holds, the source electrode of metal-oxide-semiconductor V75 connects the negative terminal that power supply exports simultaneously.
7. medical electric rifle grid power supply as claimed in claim 2, which is characterized in that low-pressure side control module (1) packet
Include accessory power supply (11), signal interface circuit (12), signal isolation circuit (13), serial port level chance-over circuit (14), the micro- place MCU
Manage device (15) and pulse signal modulation circuit (16)；
The signal isolation circuit (13), signal interface circuit (12), MCU microprocessor (15) are sequentially connected in series, the pulse letter
Number modulation circuit (16) is connected with signal isolation circuit (13), MCU microprocessor (15) respectively, the serial port level chance-over circuit
(14) it is connected with MCU microprocessor (15)；
Accessory power supply (11) is converted through DC/DC, is powered for low-pressure control module circuit, is converted through DC/AC, and power pulse is generated；
Signal isolation circuit (13) for carrying out isolation and level conversion processing to signal, and carries out V/F through signal interface circuit (12)
MCU microprocessor (15) are given in transformation, F/V transformation, output；MCU microprocessor (15) according to system operating mode, emission current and
Ray energy provides the voltage reference pulse of different frequency for grid impulse power supply；Pulse signal modulation circuit (16), in conjunction with outer
Lock-out pulse, microwave detected envelope, grid profiled pulses carry out dynamic adjustment to the delay of modulated pulse signal；Serial ports level
Conversion circuit (14) is realized and is communicated with external control system, and working condition and real time data are uploaded, is remotely monitored and is controlled
System.
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| WO2021007463A1 (en) * | 2019-07-09 | 2021-01-14 | Varex Imaging Corporation | Electron gun driver |
| CN110545611B (en) * | 2019-08-09 | 2021-01-08 | 北京纳米维景科技有限公司 | Method for realizing grid control isolation and grid control circuit |
| CN110690090B (en) * | 2019-10-10 | 2020-10-16 | 清华大学 | Grid-controlled electron gun power supply |
| CN110838842A (en) * | 2019-11-14 | 2020-02-25 | 深圳先进技术研究院 | Drive control circuit, device and system of field emission X-ray source |
| CN112349567B (en) * | 2020-10-26 | 2023-03-14 | 中国科学院近代物理研究所 | Hot cathode electron gun for generating high repetition frequency pulse electron beam and method of use thereof |
| CN112542972B (en) * | 2020-12-10 | 2024-04-12 | 重庆市新众誉科技有限公司 | Vector control high-voltage synchronous motor driving system for deviation rectifying controller |
| CN112735932B (en) * | 2020-12-10 | 2024-02-20 | 北京无线电测量研究所 | Digital control pulse modulation circuit for traveling wave tube |
| CN114244176A (en) * | 2021-11-18 | 2022-03-25 | 成都艾立本科技有限公司 | Time sequence adjustable pulse power supply pack |
| CN114300323B (en) * | 2021-12-29 | 2024-03-08 | 核工业理化工程研究院 | Method for rapidly controlling on-off of electron beam through pulse width modulation pulse |
| CN114364116B (en) * | 2022-01-04 | 2024-01-05 | 广州赛隆增材制造有限责任公司 | Power supply device for electron gun |
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