CN208016094U - A kind of heating control apparatus of X-ray radiation tube filament - Google Patents
A kind of heating control apparatus of X-ray radiation tube filament Download PDFInfo
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- CN208016094U CN208016094U CN201820277865.6U CN201820277865U CN208016094U CN 208016094 U CN208016094 U CN 208016094U CN 201820277865 U CN201820277865 U CN 201820277865U CN 208016094 U CN208016094 U CN 208016094U
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Abstract
The utility model is suitable for radiation technique field, is related to a kind of heating control apparatus of X-ray radiation tube filament, including：Direct-flow input circuit, for receiving DC power supply；Interaction circuit sends heating signal and heating benchmark for receiving heating instructions；Pwm circuit, for receiving heating signal and heating benchmark, output pwm signal；Heater circuit, for according to pwm signal, exporting alternating source and radiating bulb to X-ray；Heater current sample circuit, the heater current for radiating bulb to X-ray are acquired, and sampled voltage is sent interaction circuit and pwm circuit；Pwm circuit is additionally operable to adjust the duty ratio of pwm signal according to sampled voltage；Interaction circuit, is additionally operable to the value of sampled voltage being sent to external control circuit.By the utility model, user can realize human-computer interaction by interaction circuit, realize the computer heating control to filament, and X-ray emission bulb is steadily made to be heated to the corresponding degree of heating benchmark, the X-ray that preferably control generates.
Description
Technical field
The utility model belongs to the computer heating control dress of radiation technique field more particularly to a kind of X-ray radiation tube filament
It sets.
Background technology
Direct digital radiograph system (Digital Radiography, abbreviation DR) equipment is a kind of common doctor
Treat diagnostic device.DR equipment can form energy by subject X-ray irradiation and receiving and penetrating the X-ray of subject
The photographs of organ-tissue form in subject is enough presented.In DR equipment, X-ray is generated by X-ray radiation bulb
And emit.
X-ray radiation bulb is actually the cathode-ray diode of a big high vacuum, with cathode and anode,
Filament is provided on cathode.In the course of work that X-ray radiates bulb, by adding electric current to cathode filament so that filament
It heats and generates free electronics and converge, then to negative and positive the two poles of the earth high voltage, since negative and positive the two poles of the earth potential difference increases suddenly, in high pressure forceful electric power
Under the driving of field, the free electron beam in active state will hit to anode molybdenum-base tungsten target and energy occurs and turn on cathode filament
It changes, a part of electric energy is converted into X-ray and is emitted by window, and another part electric energy is converted into thermal energy and is distributed by cooling system.
Wherein, the electric current for supplying cathode filament is known as heater current, and the voltage between negative and positive the two poles of the earth is known as tube voltage, and filament heating produces
The raw electronics electric current that hypervelocity is moved and formed on the sunny side under the effect of negative and positive the two poles of the earth high voltage electric field is known as tube current (also referred to as mA).
In the prior art, when the filament for radiating bulb to X-ray heats, it cannot achieve and ball is radiated to X-ray
The control of the filament heating degree of pipe, while cannot achieve the operation of human-computer interaction.
Utility model content
The technical problem to be solved by the utility model is to provide the computer heating control dresses that a kind of X-ray radiates tube filament
It sets, it is intended to solve in the prior art, when the filament for radiating X-ray bulb heats, to cannot achieve and radiate ball to X-ray
The control of the filament heating degree of pipe, and the problem of cannot achieve the operation of human-computer interaction.
The utility model is realized in this way a kind of heating control apparatus of X-ray radiation tube filament, including interaction electricity
Road, pwm circuit, direct-flow input circuit, heater circuit, heater current sample circuit：
The direct-flow input circuit, for receiving DC power supply；
The interactive circuit, is connected with the pwm circuit, for receiving heating instructions, sends heating signal and heating
Benchmark gives the pwm circuit；
The pwm circuit is connected with the heater circuit, for receiving the heating signal and heating benchmark, output
Pwm signal gives the heater circuit；
The heater circuit is connected respectively with the direct-flow input circuit, X-ray radiation bulb, for according to
Pwm signal exports alternating source and radiates bulb to the X-ray so that X-ray radiates the filament of bulb according to alternation electricity
Source is heated to the heating benchmark；
The heater current sample circuit, respectively with the X-ray radiation bulb, it is described interact circuit and the PWM electricity
Road is connected, and the heater current for radiating bulb to the X-ray is acquired, and obtains sampled voltage, by sampling electricity
The interactive circuit and the pwm circuit are sent in pressure；
The pwm circuit is additionally operable to adjust the duty ratio of the pwm signal according to the sampled voltage；
The interactive circuit is additionally operable to the value of the sampled voltage being sent to external control circuit.
Further, the pwm circuit includes pwm control circuit and PWM output circuits；
The pwm control circuit is sampled with circuit, the PWM output circuits and the heater current of interacting respectively
Circuit is connected, for according to the heating signal and the heating benchmark, output to meet the heating signal and the heating
The pwm control signal of benchmark, and the pwm control signal is sent to the PWM output circuits；
The PWM output circuits give heating electricity for exporting stable pwm signal according to the pwm control signal
Road.
Further, the heater circuit includes isolated drive circuit and inverter circuit；
The isolated drive circuit is connected with the pwm circuit and the inverter circuit respectively, for the PWM
Signal carries out high and low voltage isolation, is amplified to the pwm signal after high and low voltage isolation, the pwm signal of amplification is sent to described
Inverter circuit；
The inverter circuit, respectively with the direct-flow input circuit, the heater current sample circuit and the X rays
Radiation bulb is connected, and for receiving the amplified pwm signal, export alternating source and gives residing X-ray radiation bulb,
To control the filament heating degree that the X-ray radiates bulb, and then control generated amount of x-ray.
Further, the isolated drive circuit includes optical couple isolation drive circuit or transformer isolation driving circuit.
Further, the inverter circuit includes full bridge inverter or half-bridge inversion circuit.
Further, the optical couple isolation drive circuit includes the first photoelectrical coupler, the second photoelectrical coupler, third light
Electric coupler and the 4th photoelectrical coupler；
The input terminal of first photoelectrical coupler is connected with the first output end of the pwm circuit, first light
First output end of electric coupler connects the first control terminal of the inverter circuit, the second output of first photoelectrical coupler
End connects the first output end of the inverter circuit；
The input terminal of second photoelectrical coupler is connected with the second output terminal of the pwm circuit, second light
The output end of electric coupler connects the second control terminal of the inverter circuit；
The input terminal of the third photoelectrical coupler is connected with the second output terminal of the pwm circuit, the third light
First output end of electric coupler connects the third control terminal of the inverter circuit, the second output of the third photoelectrical coupler
End connects the second output terminal of the inverter circuit；
The input terminal of 4th photoelectrical coupler is connected with the first output end of the pwm circuit, the 4th light
The output end of electric coupler connects the 4th control terminal of the inverter circuit.
Further, the full bridge inverter include the first field-effect tube, the second field-effect tube, third field-effect tube and
4th field-effect tube；
The grid of first field-effect tube connects first control terminal, and the drain electrode of first field-effect tube connects institute
The drain electrode of third field-effect tube is stated, the source electrode of first field-effect tube connects the drain electrode of second field-effect tube；
The grid of second field-effect tube connects second control terminal, and the source electrode of second field-effect tube connects institute
State the source electrode of the 4th field-effect tube；
The grid of the third field-effect tube connects the third control terminal, and the source electrode of the third field-effect tube connects institute
State the drain electrode of the 4th field-effect tube；
The grid of 4th field-effect tube connects the 4th control terminal；The direct-flow input circuit is connected to described
Between the drain electrode of one field-effect tube and the drain electrode of the third field-effect tube；Ground terminal is connected to the source of second field-effect tube
Between pole and the source electrode of the 4th field-effect tube；First output end of the full bridge inverter is connected to first effect
It should be between the source electrode and the drain electrode of second field-effect tube of pipe；The second output terminal of the full bridge inverter is connected to described
Between the source electrode of third field-effect tube and the drain electrode of the 4th field-effect tube.
Further, first field-effect tube, second field-effect tube, the third field-effect tube and the described 4th
Field-effect tube is N-channel field-effect tube.
Further, the heater current sample circuit includes heater current sampling sub-circuit, heater current feedback son electricity
Road and function and protecting sub-circuit；
The heater current samples sub-circuit, radiates bulb, the heater current feedback sub-circuit with the X-ray respectively
It is connected with the function and protecting sub-circuit, the heater current for radiating bulb to the X-ray is acquired, and will be collected
Current signal carry out isolation reduction, will isolation reduce after current signal carry out pressure difference, after analog-to-digital conversion, obtain steady
The current sample voltage of fixed X-ray radiation bulb, is sent to the heater current by the current sample voltage and feeds back
Sub-circuit and the function and protecting sub-circuit；
The function and protecting sub-circuit is connected with the circuit that interacts, for by the current sample voltage with it is preset
Sampled voltage compare, comparison result is sent to the interactive circuit；
The heater current feedback sub-circuit is connected with the pwm circuit and the circuit that interacts respectively, for institute
It states current sample voltage and is filtered and handled with rectification, it will treated that current sample voltage is sent to the pwm circuit and institute
State interactive circuit.
Further, the heater current sampling sub-circuit includes D.C mutual-inductor, sampling resistor and analog-digital converter；
The second end of the D.C mutual-inductor connects the first output end of the full bridge inverter, the D.C mutual-inductor
First end connect the filament of X-ray radiation bulb, the third end of the D.C mutual-inductor connects the analog-digital converter
The second input terminal, the 4th end of the D.C mutual-inductor connects the first input end of the analog-digital converter；The modulus turns
The output end of parallel operation connects the heater current feedback sub-circuit and the function and protecting sub-circuit；
The sampling resistor is connected between the third end of the D.C mutual-inductor and the 4th end.
Compared with prior art, advantageous effect is the utility model：The computer heating control that the utility model embodiment provides
The interaction circuit of device receives the heating instructions of user, sends heating signal and heating benchmark gives PWM circuits, pwm circuit to receive
To after the heating signal and heating benchmark, pwm signal is sent to heater circuit, which hands over according to the pwm signal, output
Variable power source radiates bulb to X-ray so that the filament of X-ray radiation bulb is heated to the heating base according to the alternating source
Standard, heater current sample circuit acquire heater current, collected sampled voltage are sent to interactive circuit and pwm circuit, hand over
The value of the sampled voltage is sent to external control circuit by mutual circuit, which adjusts the PWM according to the sampled voltage believes
Number duty ratio.The heating control apparatus that the utility model embodiment provides, user can realize man-machine friendship by interaction circuit
Mutually, it realizes the computer heating control for radiating tube filament to X-ray, X-ray emission bulb can steadily be made to be heated to heating benchmark
Corresponding degree, to preferably control the X-ray of generation.
Description of the drawings
Fig. 1 is a kind of structure of the heating control apparatus for X-ray radiation tube filament that the utility model embodiment provides
Schematic diagram；
Fig. 2 is a kind of the detailed of the heating control apparatus for X-ray radiation tube filament that the utility model embodiment provides
Structural schematic diagram
Fig. 3 is the structural schematic diagram for the optical couple isolation drive circuit that the utility model embodiment provides；
Fig. 4 is the structural schematic diagram for the full bridge inverter that the utility model embodiment provides；
Fig. 5 is the structural schematic diagram for the heater current sampling sub-circuit that the utility model embodiment provides.
Specific implementation mode
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only used to explain
The utility model is not used to limit the utility model.
Embodiment provided by the utility model can apply the control neck that X-ray tube filament heats in radiation field
Domain, in the case of no exposure photography, X-ray radiates bulb and keeps a low-light level, when preparation, control X-ray radiation
The filament of bulb carries out computer heating control according to the heating benchmark that provides, so that the degree of heating is reached in suitable range, to produce
Raw radiological dose improves the photographic quality and stability of radiophotography in required range.
Fig. 1 shows a kind of heating control apparatus for X-ray radiation tube filament that the utility model embodiment provides, packet
Include interactive circuit 1, pwm circuit 2, direct-flow input circuit 3, heater circuit 4, heater current sample circuit 5；
Direct-flow input circuit 3, for receiving DC power supply；Interaction circuit 1, is connected with pwm circuit 2, adds for receiving
Heat instruction sends heating signal and heating benchmark to pwm circuit 2；Pwm circuit 2 is connected with heater circuit 4, for receiving
Heating signal and heating benchmark are stated, output pwm signal is to heater circuit 4；
Heater circuit 4 is connected respectively with direct-flow input circuit 3, X-ray radiation bulb, for according to the pwm signal
(Pulse Width Modulation, pulse width modulating signal) exports alternating source and radiates bulb to the X-ray, make
The filament for obtaining X-ray radiation bulb is heated to the heating benchmark according to the alternating source；
Heater current sample circuit 5, respectively with X-ray radiation bulb, interact circuit 1 and pwm circuit 2 is connected,
Heater current for radiating bulb to the X-ray is acquired, and obtains sampled voltage, and sampled voltage is sent interaction circuit
1 and pwm circuit 2；
Pwm circuit 2 is additionally operable to adjust the duty ratio of the pwm signal according to the sampled voltage；
Interaction circuit 1, is additionally operable to the value of the sampled voltage being sent to external control circuit.
Specifically, as shown in Fig. 2, pwm circuit 2 includes pwm control circuit 201 and PWM output circuits 202；Heater circuit 4
Including isolated drive circuit 401 and inverter circuit 402；Heater current sample circuit 5 include heater current sampling sub-circuit 501,
Heater current feedback sub-circuit 502 and function and protecting sub-circuit 503；
Pwm control circuit 201, respectively with interact 502 phase of circuit 1, PWM output circuits 2 and heater current feedback sub-circuit
Connection, for according to the heating signal and the heating benchmark, output meets the heating signal and the heating benchmark
Pwm control signal, and the pwm control signal is sent to the PWM output circuits 202；
The PWM output circuits 202, are connected with isolated drive circuit 401, defeated for controlling signal according to the PWM
Go out stable pwm signal to isolated drive circuit 401,
Isolated drive circuit 401 is connected with inverter circuit 402, for carrying out high and low voltage isolation to the pwm signal,
Pwm signal after high and low voltage isolation is amplified, the pwm signal of amplification is sent to inverter circuit 402；
Inverter circuit 402 is put with X-ray described in direct-flow input circuit 4, heater current sampling sub-circuit 501, direct current respectively
It penetrates bulb to be connected, for receiving the amplified pwm signal, exports alternating source and radiate bulb to residing X-ray, with control
The filament heating degree of the X-ray radiation bulb is made, and then controls generated amount of x-ray.
Heater current sample sub-circuit 501, respectively with the X-ray radiation bulb, heater current feedback sub-circuit 502 and
Function and protecting sub-circuit 503 is connected, and the heater current for radiating bulb to the X-ray is acquired, will be collected
Current signal carries out isolation reduction, and the current signal after isolation is reduced carries out pressure difference and stablized after analog-to-digital conversion
The X-ray radiation bulb current sample voltage, the current sample voltage is sent to heater current feedback sub-circuit
502 and function and protecting sub-circuit 503；
Function and protecting sub-circuit 503 is connected with circuit 1 is interacted, for adopting the current sample voltage with preset
Sample voltage compares, and comparison result is sent to interactive circuit 1；
Heater current feedback sub-circuit 502, respectively with pwm control circuit 201 and interact circuit 1 and be connected, for institute
It states current sample voltage and is filtered and handled with rectification, it will treated that current sample voltage is sent to 201 He of pwm control circuit
Interaction circuit 1.
In a particular application, isolated drive circuit 401 can be driven by optical couple isolation drive circuit or transformer isolation
Circuit realizes that above-mentioned function, inverter circuit 402 can realize above-mentioned work(by full bridge inverter or half-bridge inversion circuit
Energy.In the utility model embodiment, optical couple isolation drive circuit and full bridge inverter is respectively adopted to realize.
Fig. 3 shows optical couple isolation drive circuit provided in an embodiment of the present invention, including the first photoelectrical coupler OC1,
Two photoelectrical coupler OC2, third photoelectrical coupler OC3 and the 4th photoelectrical coupler OC4；
The input terminal Anode of first photoelectrical coupler OC1 is connected with the first output end PWM1 of pwm circuit 2, and first
First control terminal PWMA1 of the first output end vo ut connections inverter circuit 402 of photoelectrical coupler OC1, the first photoelectrical coupler
First output end PWMOUT1 of the second output terminal VEE connections inverter circuit 402 of OC1；
The input terminal Anode of second photoelectrical coupler OC2 is connected with the second output terminal PWM2 of pwm circuit 2, described
Second control terminal PWMB2 of the output end vo ut connections inverter circuit 402 of two photoelectrical coupler OC2；
The input terminal Anode of third photoelectrical coupler OC3 is connected with the second output terminal PWM2 of pwm circuit 2, third
The third control terminal PWMA3 of the first output end vo ut connections inverter circuit 402 of photoelectrical coupler OC3, third photoelectrical coupler
The second output terminal PWMOUT2 of the second output terminal VEE connections inverter circuit 402 of OC3；
The input terminal Anode of 4th photoelectrical coupler OC4 is connected with the first output end PWM1 of pwm circuit 2, and the 4th
4th control terminal PWMA4 of the output end vo ut connections inverter circuit 402 of photoelectrical coupler OC4.
Fig. 4 shows full bridge inverter provided in an embodiment of the present invention, including the first field-effect tube, the second field-effect tube
Q2, third field-effect tube Q3 and the 4th field-effect tube Q4；
The drain electrode that the grid of first field-effect tube Q1 connects the first control terminal PWMA1, the first field-effect tube Q1 connects third
The drain electrode of field-effect tube Q3, the source electrode of the first field-effect tube Q1 connect the drain electrode of the second field-effect tube Q2；
The grid of second field-effect tube Q2 connects the source electrode connection the 4th of the second control terminal PWMB2, the second field-effect tube Q2
The source electrode of field-effect tube Q4；
The grid of third field-effect tube Q3 connects third control terminal PWMB3, the source electrode connection the 4th of third field-effect tube Q3
The drain electrode of field-effect tube Q4；
The grid of 4th field-effect tube Q4 connects the 4th control terminal PWMA4；The output end Vin connections of direct-flow input circuit 4
Between the drain electrode and the drain electrode of third field-effect tube Q3 of the first field-effect tube Q1；Ground terminal GND is connected to the second field-effect tube
Between the source electrode of Q2 and the source electrode of the 4th field-effect tube Q4；First output end PWMOUT1 of full bridge inverter is connected to first
Between the source electrode of field-effect tube Q1 and the drain electrode of the second field-effect tube Q2；The second output terminal PWMOUT2 of full bridge inverter connects
It is connected between the source electrode and the drain electrode of the 4th field-effect tube Q4 of third field-effect tube Q3.
Turn including D.C mutual-inductor CT1, sampling resistor R1 and modulus as shown in figure 5, heater current samples sub-circuit 501
Parallel operation RMS1；
The second end 2 of D.C mutual-inductor CT1 connects the first output end PWMOUT1 of the full bridge inverter, and exchange is mutual
The first end 1 of sensor CT1 connects the filament of the X-ray radiation bulb, and the third end 3 of D.C mutual-inductor CT1 connects modulus and turns
The first input end of the 4th end 4 connection analog-digital converter RMS1 of the second input terminal VIN of parallel operation RMS1, D.C mutual-inductor CT1
The output end OUT connections heater current feedback sub-circuit of CC, analog-digital converter RMS1 and the function and protecting sub-circuit；
Sampling resistor R1 is connected between the third end 3 of D.C mutual-inductor CT1 and the 4th end 4.
Specifically, in the utility model embodiment, direct-flow input circuit provides power input, full bridge inverter
By controlling the break-make of the field-effect tube MOSFET of N-channel, the DC power supply inversion that direct-flow input circuit inputs is made to be handed over for high frequency
Galvanic electricity.When PWMA1 and PWMA4 are high level and PWMB2 and PWMB3 is low level, Q1 and Q4 are simultaneously turned on, and Q2 and Q3 are same
When turn off, PWMOUT1 exports Vin, and PWMOUT2 drags down；When PWMA1 and PWMA4 are low level and PWMB2 and PWMB3 is high electricity
Usually, Q1 and Q4 are simultaneously turned off, and Q2 and Q3 are simultaneously turned on, and PWMOUT1 is dragged down, and PWMOUT2 exports Vin, is formed by aforesaid operations
It is output to the alternating voltage of X-ray radiation tube filament, lights filament.When the duty ratio of PWMA1, PWMA4, PWMB2 and PWMB3
When changing, being output to the alternating voltage of X-ray radiation bulb can also change, and bulb is radiated so as to control X-ray
Filament heating degree, and then control generated amount of x-ray.
The electric current that heater current sampling Subcircuits module radiates X-ray using D.C mutual-inductor tube filament is isolated
It reduces, pressure difference is then formed by sampling resistor, stable X-ray can be obtained by, which being finally AD converted by analog-digital converter, puts
Penetrate the current sample voltage of tube filament.
Function and protecting sub-circuit is compared by the current sample voltage to filament, and short circuit can be arranged and overcurrent is protected
Shield, you can to control the maximum magnitude of X-ray radiation tube filament heating, prevent filament from going beyond the scope and blow；Simultaneously X is detected to penetrate
Whether line radiation tube filament is lighted；By the detection to voltage, under-voltage and overvoltage protection can be set；
Heater current feedback sub-circuit is filtered the current sample voltage of filament, rectification is handled, and removes clutter and does
It disturbs, heater current is allow correctly to be collected, judge in order not to make any any mistakes.
Heater current sampled voltage is input to the IC cores in pwm control circuit after the processing by heater current feedback circuit
Piece, then the duty ratio of the IC chip adjustment pwm signal by variation of heater current, makes heater current keep stablizing.
When to be heated, interaction circuit receives the heating instructions of user, sends out a prepared heating signal and carries simultaneously
For the heating benchmark of a heater current, then pwm control circuit can be according to the heater current benchmark adjustment output issued
Pwm signal so that X-ray tube filament is heated to set datum mark；When terminating X-ray output, interaction circuit can stop
Only one original heating benchmark of output while output of heating signal, makes filament heating return to original state.
PWM output circuit modules are for exporting stable pwm signal to optical couple isolation drive circuit.
Have primary control program on interaction circuit to interact with host computer, which can set filament heating ginseng
Number, primary control program is mainly to provide the benchmark of heating signal and filament heating degree, while connecting computer by serial ports, realizes people
Machine interacts.
The control of X-ray radiation tube filament heating may be implemented in the utility model embodiment, can steadily make X-ray
Radiation tube filament is heated to required degree, and human-computer interaction may be implemented, and preferably controls X-ray and radiates bulb lamp
The heating state of silk, to preferably control the X-ray of generation, in radiation field, user can be provided by primary control program
The reference degree of heating signal and heating, by the duty ratio for controlling pwm signal so that full bridge inverter changes, defeated
The power for going out to X-ray to radiate tube filament changes, and then X-ray radiation tube filament is made to begin to warm up；Further through lamp
Silk current sample sub-circuit radiates X-ray the heated condition feedback meeting pwm control circuit of tube filament, pwm control circuit tune
The duty ratio of whole pwm signal heats so as to adjust X-ray tube filament.The utility model embodiment can be applied in medicine shadow
In the radiation field of picture, such as therapeutic medical DR products, in radiophotography the heating of control illuminator generate required ray etc..
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
All any modification, equivalent and improvement etc., should be included in the utility model made by within the spirit and principle of utility model
Protection domain within.
Claims (10)
1. a kind of heating control apparatus of X-ray radiation tube filament, which is characterized in that including interaction circuit, pwm circuit, straight
Flow input circuit, heater circuit, heater current sample circuit：
The direct-flow input circuit, for receiving DC power supply；
The interactive circuit, is connected with the pwm circuit, for receiving heating instructions, sends heating signal and heating benchmark
To the pwm circuit；
The pwm circuit is connected with the heater circuit, for receiving the heating signal and heating benchmark, output PWM letters
Number give the heater circuit；
The heater circuit is connected respectively with the direct-flow input circuit, X-ray radiation bulb, for being believed according to the PWM
Number, it exports alternating source and radiates bulb to the X-ray so that the filament of X-ray radiation bulb adds according to the alternating source
Heat arrives the heating benchmark；
The heater current sample circuit, respectively with X-ray radiation bulb, described interact circuit and the pwm circuit phase
Connection, the heater current for radiating bulb to the X-ray are acquired, obtain sampled voltage, the sampled voltage is sent out
Send the interactive circuit and the pwm circuit；
The pwm circuit is additionally operable to adjust the duty ratio of the pwm signal according to the sampled voltage；
The interactive circuit is additionally operable to the value of the sampled voltage being sent to external control circuit.
2. heating control apparatus according to claim 1, which is characterized in that the pwm circuit include pwm control circuit and
PWM output circuits；
The pwm control circuit interacts circuit, the PWM output circuits and the heater current sample circuit with described respectively
It is connected, for according to the heating signal and the heating benchmark, output to meet the heating signal and the heating benchmark
Pwm control signal, and the pwm control signal is sent to the PWM output circuits；
The PWM output circuits, for exporting stable pwm signal to the heater circuit according to the pwm control signal.
3. heating control apparatus according to claim 1, which is characterized in that the heater circuit includes isolated drive circuit
And inverter circuit；
The isolated drive circuit is connected with the pwm circuit and the inverter circuit respectively, for the pwm signal
High and low voltage isolation is carried out, the pwm signal after high and low voltage isolation is amplified, the pwm signal of amplification is sent to the inversion
Circuit；
The inverter circuit radiates ball with the direct-flow input circuit, the heater current sample circuit and the X-ray respectively
Pipe is connected, and for receiving the amplified pwm signal, exports alternating source and radiates bulb to residing X-ray, to control
The filament heating degree of X-ray radiation bulb is stated, and then controls generated amount of x-ray.
4. heating control apparatus according to claim 3, which is characterized in that the isolated drive circuit includes light-coupled isolation
Driving circuit or transformer isolation driving circuit.
5. heating control apparatus according to claim 4, which is characterized in that the inverter circuit includes full bridge inverter
Or half-bridge inversion circuit.
6. heating control apparatus according to claim 5, which is characterized in that the optical couple isolation drive circuit includes first
Photoelectrical coupler, the second photoelectrical coupler, third photoelectrical coupler and the 4th photoelectrical coupler；
The input terminal of first photoelectrical coupler is connected with the first output end of the pwm circuit, the first photoelectricity coupling
First output end of clutch connects the first control terminal of the inverter circuit, and the second output terminal of first photoelectrical coupler connects
Connect the first output end of the inverter circuit；
The input terminal of second photoelectrical coupler is connected with the second output terminal of the pwm circuit, the second photoelectricity coupling
The output end of clutch connects the second control terminal of the inverter circuit；
The input terminal of the third photoelectrical coupler is connected with the second output terminal of the pwm circuit, the third photoelectricity coupling
First output end of clutch connects the third control terminal of the inverter circuit, and the second output terminal of the third photoelectrical coupler connects
Connect the second output terminal of the inverter circuit；
The input terminal of 4th photoelectrical coupler is connected with the first output end of the pwm circuit, the 4th photoelectricity coupling
The output end of clutch connects the 4th control terminal of the inverter circuit.
7. heating control apparatus according to claim 6, which is characterized in that the full bridge inverter includes first effect
Ying Guan, the second field-effect tube, third field-effect tube and the 4th field-effect tube；
The grid of first field-effect tube connects first control terminal, the drain electrode connection of first field-effect tube described the
The drain electrode of three field-effect tube, the source electrode of first field-effect tube connect the drain electrode of second field-effect tube；
The grid of second field-effect tube connects second control terminal, the source electrode connection of second field-effect tube described the
The source electrode of four field-effect tube；
The grid of the third field-effect tube connects the third control terminal, the source electrode connection of the third field-effect tube described the
The drain electrode of four field-effect tube；
The grid of 4th field-effect tube connects the 4th control terminal；The direct-flow input circuit is connected to described first
Between the drain electrode of effect pipe and the drain electrode of the third field-effect tube；Ground terminal be connected to second field-effect tube source electrode and
Between the source electrode of 4th field-effect tube；First output end of the full bridge inverter is connected to first field-effect tube
Source electrode and the drain electrode of second field-effect tube between；The second output terminal of the full bridge inverter is connected to the third
Between the source electrode of field-effect tube and the drain electrode of the 4th field-effect tube.
8. heating control apparatus according to claim 7, which is characterized in that first field-effect tube, second described
Effect pipe, the third field-effect tube and the 4th field-effect tube are N-channel field-effect tube.
9. heating control apparatus according to claim 7, which is characterized in that the heater current sample circuit includes filament
Current sample sub-circuit, heater current feedback sub-circuit and function and protecting sub-circuit；
The heater current samples sub-circuit, radiates bulb, the heater current feedback sub-circuit and institute with the X-ray respectively
It states function and protecting sub-circuit to be connected, the heater current for radiating the X-ray bulb is acquired, by collected electricity
Stream signal carries out isolation reduction, and the current signal after isolation is reduced carries out pressure difference, after analog-to-digital conversion, obtains stabilization
The current sample voltage is sent to the heater current feedback son electricity by the current sample voltage of the X-ray radiation bulb
Road and the function and protecting sub-circuit；
The function and protecting sub-circuit is connected with the circuit that interacts, for adopting the current sample voltage with preset
Sample voltage compares, and comparison result is sent to the interactive circuit；
The heater current feedback sub-circuit is connected with the pwm circuit and the circuit that interacts respectively, for the electricity
Stream sampled voltage is filtered to be handled with rectification, and by treated, current sample voltage is sent to the pwm circuit and the friendship
Mutual circuit.
10. heating control apparatus according to claim 9, which is characterized in that the heater current samples sub-circuit and includes
D.C mutual-inductor, sampling resistor and analog-digital converter；
The second end of the D.C mutual-inductor connects the first output end of the full bridge inverter, and the of the D.C mutual-inductor
One end connects the filament of X-ray radiation bulb, and the third end of the D.C mutual-inductor connects the of the analog-digital converter
Two input terminals, the 4th end of the D.C mutual-inductor connect the first input end of the analog-digital converter；The analog-digital converter
Output end connect the heater current feedback sub-circuit and the function and protecting sub-circuit；
The sampling resistor is connected between the third end of the D.C mutual-inductor and the 4th end.
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| CN201820277865.6U CN208016094U (en) | 2018-02-27 | 2018-02-27 | A kind of heating control apparatus of X-ray radiation tube filament |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109275255A (en) * | 2018-10-29 | 2019-01-25 | 同方威视技术股份有限公司 | Filament supply and electron accelerator for electron accelerator |
| CN113438785A (en) * | 2021-06-18 | 2021-09-24 | 浙江国研智能电气有限公司 | Power supply for bulb tube filament of high-voltage X-ray machine |
-
2018
- 2018-02-27 CN CN201820277865.6U patent/CN208016094U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109275255A (en) * | 2018-10-29 | 2019-01-25 | 同方威视技术股份有限公司 | Filament supply and electron accelerator for electron accelerator |
| CN109275255B (en) * | 2018-10-29 | 2024-04-26 | 同方威视技术股份有限公司 | Filament power supply for electron accelerator and electron accelerator |
| CN113438785A (en) * | 2021-06-18 | 2021-09-24 | 浙江国研智能电气有限公司 | Power supply for bulb tube filament of high-voltage X-ray machine |
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