CN209526936U - Filament supply and electron accelerator for electron accelerator - Google Patents
Filament supply and electron accelerator for electron accelerator Download PDFInfo
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- CN209526936U CN209526936U CN201821756695.6U CN201821756695U CN209526936U CN 209526936 U CN209526936 U CN 209526936U CN 201821756695 U CN201821756695 U CN 201821756695U CN 209526936 U CN209526936 U CN 209526936U
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Abstract
The utility model provides a kind of filament supply and electron accelerator for electron accelerator, and filament supply includes: rectification circuit, is configured as power frequency ac voltage signal being converted to d. c. voltage signal；Inverter circuit is configured as d. c. voltage signal being converted to ac voltage signal and export；Sample circuit is configured as at least one of the current signal exported to inverter circuit and voltage signal and samples, to obtain at least one of electric current and voltage sampling signal；PWM controller chip is configured as the duty ratio of the pulse-width signal of adjustment output, until current sampling signal is equal to the voltage of reference voltage signal equal to the voltage or voltage sampling signal of reference current signal；Modulation circuit is configured as: being modulated according to pulse-width signal to power frequency ac voltage signal, to obtain modulated signal；Power frequency ac voltage signal and modulated signal are output to inverter circuit, are converted to ac voltage signal to trigger inverter circuit for d. c. voltage signal.
Description
Technical field
The utility model relates to electron accelerator technical field more particularly to a kind of filament supplys for electron accelerator
And electron accelerator.
Background technique
In electron accelerator systems, for electron gun in launching electronics, filament needs to be heated to certain temperature and dimension
It holds in the temperature.Filament need to be suspended on negative high voltage, and electronics is pulled out from cathode.
Under traditional approach, in order to avoid power is excessive, the mode for increasing the voltage of filament supply by shelves is generallyd use
Filament is heated.For example, filament resistance is smaller when filament temperature is lower, at this time using the voltage of lower voltage shelves to lamp
Silk is heated；After filament temperature increases, filament resistance also increases, and is added at this time using the voltage of high voltage shelves to filament
Heat.
Utility model content
Inventors noted that under traditional mode heated to filament, since the voltage gear of filament supply is limited,
Such as be usually 3 grades, this makes when increasing voltage gear, filament supply output curent change it is larger, can to filament generation compared with
Large impact reduces the service life of filament.
To solve the above-mentioned problems, the utility model embodiment provides following technical solution.
According to the one side of the utility model embodiment, a kind of filament supply for electron accelerator is provided, comprising: whole
Current circuit is configured as power frequency ac voltage signal being converted to d. c. voltage signal；Inverter circuit, being configured as will be described straight
Stream voltage signal is converted to ac voltage signal and exports；Sample circuit is configured as the electric current exported to the inverter circuit
At least one of signal and voltage signal are sampled, to obtain at least one in current sampling signal and voltage sampling signal
It is a；PWM controller chip is configured as the duty ratio of the pulse-width signal of adjustment output, until the current sample is believed
Number voltage be equal to reference current signal voltage or the voltage sampling signal voltage be equal to reference voltage signal electricity
Pressure；Modulation circuit is configured as: the power frequency ac voltage signal is modulated according to the pulse-width signal, with
To modulated signal；The power frequency ac voltage signal and the modulated signal are output to the inverter circuit, described in triggering
The d. c. voltage signal is converted to ac voltage signal by inverter circuit.
In some embodiments, the voltage difference between the current sampling signal and the reference current signal is absolute
Value is the first value, and the absolute value of the voltage difference between the voltage sampling signal and the reference voltage signal is second value；
The PWM controller chip is configured as adjusting the pulsewidth of output in the case where first value is greater than the second value
The duty ratio of modulated signal, until the current sampling signal is equal to the reference current signal；It is less than institute in first value
In the case where stating second value, the duty ratio of the pulse-width signal of output is adjusted, until the voltage sampling signal is equal to described
Reference voltage signal.
In some embodiments, voltage letter of the power frequency ac voltage signal between first node and second node
Number；The modulation circuit includes: the first sampling resistor, and the first end ground connection of first sampling resistor, second end is via first
Resistance is connected to the first node；Second sampling resistor, the first end ground connection of second sampling resistor, second end is via the
Two resistance are connected to the first DC output end of the rectification circuit；Third sampling resistor, the first of the third sampling resistor
End ground connection, second end are connected to the second node via 3rd resistor；First NAND gate, the first of first NAND gate are defeated
Enter the second end that end is connected to first sampling resistor, the second input terminal is for receiving power supply voltage signal, third input terminal
It is connected to the second end of second sampling resistor, output end is for exporting the power frequency ac voltage signal；Second NAND gate,
The first input end of second NAND gate is connected to the second end of the third sampling resistor, and the second input terminal is for receiving institute
Power supply voltage signal is stated, third input terminal is connected to the second end of second sampling resistor, and output end is for exporting the work
Frequency ac voltage signal；Third NAND gate, the first input end and the second input terminal of the third NAND gate are connected to described
The output end of one NAND gate；4th NAND gate, the first input end and the second input terminal of the 4th NAND gate are connected to described
The output end of second NAND gate；The first input end of 5th NAND gate, the 5th NAND gate is connected to the third NAND gate
Output end, the second input terminal is for receiving the pulse-width signal, and output end is for exporting the modulated signal；6th with
NOT gate, the first input end of the 6th NAND gate are connected to the output end of the 4th NAND gate, and the second input terminal is for connecing
The pulse-width signal is received, output end is for exporting the modulated signal.
In some embodiments, the output end of first NAND gate is connected to the 4th input of second NAND gate
End, the output end of second NAND gate are connected to the 4th input terminal of first NAND gate.
In some embodiments, the filament supply further include: soft starting circuit is configured as in the third NAND gate
In the case where not exporting the modulated signal with the 4th NAND gate, controls the PWM controller chip and do not export institute
State pulse-width signal.
In some embodiments, the soft starting circuit includes: first diode, and the first end of the first diode connects
It is connected to the output end of three NAND gate；Second diode, the first end of second diode be connected to the described 4th with it is non-
The output end of door；The coordination electrode of the first transistor, the first transistor is connected to the one or two pole via the 4th resistance
The second end of the second end of pipe and second diode, first electrode ground connection；Third diode, the of the third diode
One end is connected to the second electrode of the first transistor and is connected to first voltage end, second end connection via the 5th resistance
To the first port of the PWM controller chip；Second transistor, the coordination electrode of the second transistor is via the 6th
Resistance is connected to the second electrode of the first transistor, first electrode ground connection, and second electrode is connected to the pulsewidth modulation control
The second port of coremaking piece.
In some embodiments, the inverter circuit includes: first switch, and the coordination electrode of the first switch is connected to
The output end of 5th NAND gate, first electrode are connected to the first DC output end of the rectification circuit, and second electrode connects
It is connected to the first ac output end of the inverter circuit；Second switch, the coordination electrode of the second switch are connected to described
The output end of six or five NAND gates, first electrode are connected to the first ac output end of the inverter circuit, and second electrode is connected to
Second DC output end of the rectification circuit；Third switch, the coordination electrode of third switch be connected to described second with
The output end of NOT gate, first electrode are connected to the first DC output end of the rectification circuit, and second electrode is connected to described inverse
Second ac output end on power transformation road；The coordination electrode of 4th switch, the 4th switch is connected to first NAND gate
Output end, first electrode are connected to the second ac output end of the inverter circuit, and second electrode is connected to the rectification circuit
The second DC output end.
In some embodiments, the first switch, the second switch, third switch and the 4th switch packet
Include insulated gate bipolar transistor.
In some embodiments, the first transistor and the second transistor include bipolar transistor.
In some embodiments, the filament supply further include: reference signal modulation circuit is configured as according to external defeated
The pulse-width signal entered is modulated the reference current signal.
According to the another aspect of the utility model embodiment, a kind of electron accelerator, including any one above-mentioned reality are provided
Apply the filament supply that electron accelerator is used for described in example.
In filament supply provided by the embodiment of the utility model, the pulsewidth modulation letter of PWM controller chip adjustment output
Number duty ratio, until the voltage that current sampling signal is equal to reference current signal or voltage sampling signal is equal to benchmark electricity
Press the voltage of signal.Modulation circuit obtains modulation letter after being modulated according to pulse-width signal to power frequency ac voltage signal
Number.Power frequency ac voltage signal and modulated signal are output to inverter circuit by modulation circuit, can trigger inverter circuit for direct current
Voltage signal is converted to ac voltage signal.Such filament supply can export synchronous with power frequency ac voltage signal constant
Electric current or constant voltage.Since filament supply is used as power source using industrial-frequency alternating current (alternating current), the dc power without boosting
Source or bulky adjustable transformer, i.e., exportable different voltage, such as the free voltage between 0-220V.In addition, filament is electric
Source can export constant electric current, avoid and carrying out the impact caused by filament in heating process filament, improve filament
The reliability of power supply.
By the detailed description referring to the drawings to the exemplary embodiment of the utility model, the utility model it is other
Feature, aspect and its advantage will become apparent.
Detailed description of the invention
Attached drawing forms part of this specification, and which depict the exemplary embodiments of the utility model, and together with saying
Bright book is used to explain the principles of the present invention together, in the accompanying drawings:
Fig. 1 is the structural schematic diagram according to the filament supply for electron accelerator of some embodiments of the utility model；
Fig. 2 is the partial circuit according to the filament supply for electron accelerator of the utility model other embodiments
Structural schematic diagram；
Fig. 3 is the partial circuit according to the filament supply for electron accelerator of the other embodiment of the utility model
Structural schematic diagram；
Fig. 4 is the partial circuit according to the filament supply for electron accelerator of the utility model still other embodiments
Structural schematic diagram.
It should be understood that the size of various pieces shown in attached drawing is not to draw according to actual proportionate relationship.
In addition, same or similar reference label indicates same or similar component.
Specific embodiment
The various exemplary embodiments of the utility model are described in detail now with reference to attached drawing.To exemplary embodiment
Description is merely illustrative, never as to the utility model and its application or any restrictions used.The utility model can
To be embodied in many different forms, it is not limited to the embodiments described herein.These embodiments are provided so that this is practical new
Type is thorough and complete, and gives full expression to the scope of the utility model to those skilled in the art.It should also be noted that unless in addition having
Body explanation, positioned opposite, material component, the numerical expression sum number of the component and step that otherwise illustrate in these embodiments
Value should be construed as merely illustratively, not as limitation.
" first ", " second " used in the utility model and similar word be not offered as any sequence, quantity or
Person's importance, and be used only to distinguish different parts.The similar word such as " comprising " or "comprising" means before the word
Element covers the element enumerated after the word, it is not excluded that is also covered by the possibility of other element."upper", "lower" etc. are only used for indicating
Relative positional relationship, after the absolute position for being described object changes, then the relative positional relationship may also correspondingly change.
In the present invention, specific at this when being described to particular elements between the first component and second component
May exist intervening elements between component and the first component or second component, intervening elements can also be not present.When being described to spy
When determining the component other components of connection, which can be directly connected to other components without intervening elements,
It can not be directly connected to other components and there are intervening elements.
Neck belonging to all terms (including technical term or scientific term) and the utility model that the utility model uses
The meaning that the those of ordinary skill in domain understands is identical, unless otherwise specifically defined.It is also understood that fixed in such as general dictionary
The term of justice should be interpreted as having the meaning consistent with their meanings in the context of the relevant technologies, without applying
Idealization or the meaning of extremely formalization explain, unless being clearly defined herein.
Technology, method and apparatus known to person of ordinary skill in the relevant may be not discussed in detail, but suitable
In the case of, the technology, method and apparatus should be considered as part of specification.
Fig. 1 is the structural schematic diagram according to the filament supply for electron accelerator of some embodiments of the utility model.
As shown in Figure 1, filament supply may include rectification circuit 101, inverter circuit 102, sample circuit 103, pulsewidth tune
System control chip 104 and modulation circuit 105.
Rectification circuit 101 is configured as power frequency ac voltage signal (such as voltage is 220V, frequency 50Hz) conversion
For d. c. voltage signal.Here, voltage signal of the power frequency ac voltage signal between first node N1 and second node N2, directly
Flow the voltage signal between the first DC output end N3 and the second DC output end N4 that voltage signal is rectification circuit 101.Example
Such as, the second DC output end N4 can be grounded.
Inverter circuit 102 is configured as d. c. voltage signal being converted to ac voltage signal and export, such as by inverse
The first ac output end OUT1 and the second ac output end OUT2 on power transformation road 102 are exported.It should be understood that the first ac output end
OUT1 and the second ac output end OUT2 is also the output end of filament supply.In some embodiments, filament supply can also wrap
Include the filter capacitor (not shown) being connected in parallel between rectification circuit 101 and inverter circuit 102.
Sample circuit 103 is configured as at least one of the current signal exported to inverter circuit 102 and voltage signal
It is sampled, to obtain at least one of current sampling signal and voltage sampling signal.For example, sample circuit 103 can wrap
Include at least one of current sampling circuit 113 and voltage sampling circuit 123.Current sampling circuit 113 is configured as to inversion
The current signal that circuit 102 exports is sampled, to obtain current sampling signal.Voltage sampling circuit 123 is configured as to inverse
The voltage signal that power transformation road 102 exports is sampled, to obtain voltage sampling signal.It should be understood that current sampling signal here
For the voltage signal for being able to reflect the current signal that inverter circuit 102 exports.
PWM controller chip 104 is configured as the duty ratio of the pulse-width signal of adjustment output, until electric current is adopted
Sample signal is equal to reference current signal REF1 or voltage sampling signal is equal to reference voltage signal REF2.In some embodiments
In, PWM controller chip 104 for example can be LT494 PWM controller chip.
Here, reference current signal REF1 and reference voltage signal REF2 can be is set according to actual needs.
For example, reflecting expectation electric current after the expectation electric current for the filament supply output that user is adjusted by potentiometer and desired voltage
The reference voltage signal REF2 of reference current signal REF1 and reflection expectation voltage can determine.
In some embodiments, the current signal that sample circuit 103 is configured as only exporting inverter circuit 102 is adopted
Sample, to obtain current sampling signal.In this case, PWM controller chip 104 is configured as the pulsewidth tune of adjustment output
The duty ratio of signal processed, until current sampling signal is equal to reference current signal REF1.
In further embodiments, sample circuit 103 is configured as only carrying out the voltage signal that inverter circuit 102 exports
Sampling, to obtain voltage sampling signal.In this case, PWM controller chip 104 is configured as the pulsewidth of adjustment output
The duty ratio of modulated signal, until voltage sampling signal is equal to reference voltage signal REF2.
Sample circuit 103 is configured as the current signal and voltage exported to inverter circuit 102 in yet other embodiments,
Signal is sampled, to obtain current sampling signal and voltage sampling signal.In this case, PWM controller chip 104
It is configured as the duty ratio of the pulse-width signal of adjustment output, until current sampling signal is equal to reference current signal REF1,
Or voltage sampling signal is equal to reference voltage signal REF2.In this case, accounting in the pulse-width signal of adjustment output
After sky ratio, current sampling signal and voltage sampling signal can change.As long as meeting one of following condition: current sample letter
Number be equal to reference current signal REF1, voltage sampling signal be equal to reference voltage signal REF2, PWM controller chip 104 is just
No longer adjust the duty ratio of the pulse-width signal of output.
Modulation circuit 105 is configured as the pulse-width signal exported according to PWM controller chip 104 and hands over power frequency
Stream voltage signal is modulated, to obtain modulated signal；Power frequency ac voltage signal and modulated signal are output to inverter circuit
102, d. c. voltage signal is converted into ac voltage signal to trigger inverter circuit 102.
In above-described embodiment, the duty ratio of the pulse-width signal of PWM controller chip adjustment output, until electric current
Sampled signal is equal to the voltage of reference voltage signal equal to the voltage of reference current signal or voltage sampling signal.Modulation electricity
Road obtains modulated signal after being modulated according to pulse-width signal to power frequency ac voltage signal.Modulation circuit is by industrial frequency AC
Voltage signal and modulated signal are output to inverter circuit, can trigger inverter circuit for d. c. voltage signal and be converted to alternating voltage
Signal.Such filament supply can export the constant current or constant voltage synchronous with power frequency ac voltage signal.
Filament supply provided by the embodiment of the utility model is used as power source using industrial-frequency alternating current (alternating current), without boosting
Direct current power source or bulky adjustable transformer, i.e., exportable different voltage.In addition, filament supply can export it is constant
Electric current avoids and is carrying out the impact caused by filament in heating process filament, improves the reliability of filament supply.
Filament supply provided by the embodiment of the utility model can be used for electron gun filament, magnetron heater or velocity modulation spot
Silk etc. is heated.
In some embodiments, sample circuit 103 is configured as the current signal exported to inverter circuit 102 and voltage letter
It number is sampled, to obtain current sampling signal and voltage sampling signal.Assuming that current sampling signal and reference current signal
The absolute value of voltage difference between REF1 is the first value, the voltage difference between voltage sampling signal and reference voltage signal REF2
The absolute value of value is second value.PWM controller chip 105 can be configured as in the case where the first value is greater than second value,
The duty ratio of the pulse-width signal of output is adjusted, until current sampling signal is equal to reference current signal；It is less than in the first value
In the case where second value, the duty ratio of the pulse-width signal of output is adjusted, until voltage sampling signal is believed equal to reference voltage
Number.
For example, if voltage of the voltage of current sampling signal equal to reference current signal REF1, and voltage sampling signal
Voltage be less than reference voltage signal REF2 voltage, then no longer adjust pulse-width signal duty ratio；In another example if electric
The voltage of sampled signal is pressed to be equal to the voltage of reference voltage signal REF2, and the voltage of current sampling signal is believed less than reference current
The voltage of number REF1 then no longer adjusts the duty ratio of pulse-width signal.
Fig. 2 is the partial circuit according to the filament supply for electron accelerator of the utility model other embodiments
Structural schematic diagram.
As shown in Fig. 2, modulation circuit 105 includes the first sampling resistor R1, the second sampling resistor R2, third sampling resistor
R3, the first NAND gate U1, the second NAND gate U2, third NAND gate U3, the 4th NAND gate U4, the 5th NAND gate U5 and the 6th with it is non-
Door U6.
The first end of first sampling resistor R1 is grounded G, and second end is connected to first node N1 via first resistor r1.One
In a little embodiments, the both ends of the first sampling resistor R1 can be parallel at least one of filter capacitor C1 and voltage-stabiliser tube V1.
The first end of second sampling resistor R2 is grounded G, and second end is connected to the first of rectification circuit via second resistance r2
DC output end N3.In some embodiments, the both ends of the second sampling resistor R2 can be parallel with filter capacitor C2.
The first end of third sampling resistor R3 is grounded G, and second end is connected to second node N2 via 3rd resistor r3.One
In a little embodiments, the both ends of third sampling resistor R3 can be parallel at least one of filter capacitor C3 and voltage-stabiliser tube V3.
The first input end A1 of first NAND gate U1 is connected to the second end of the first sampling resistor R1, and the second input terminal A2 is used
In receiving power supply voltage signal, third input terminal A3 is connected to the second end of the second sampling resistor R2, and output end O1 is for exporting
Power frequency ac voltage signal.For example, power frequency ac voltage signal can be output to inverter circuit via optocoupler by output end O1
102。
For example, modulation circuit can also include the 4th sampling resistor R4, the first end of the 4th sampling resistor R4 is grounded G, the
(such as can be via voltage-stabiliser tube V4) be connected to power voltage terminal VDD (such as 15V) at two ends.In certain embodiments, it the 4th adopts
The both ends of sample resistance R4 can be parallel with filter capacitor C4.In addition, can also be set between power voltage terminal VDD and voltage-stabiliser tube V4
It is equipped with light emitting diode.
The first input end B1 of second NAND gate U2 is connected to the second end of third sampling resistor R3, and the second input terminal B2 is used
In receiving power supply voltage signal, third input terminal B3 is connected to the second end of the second sampling resistor R2, and output end O2 is for exporting
Power frequency ac voltage signal.For example, power frequency ac voltage signal can be output to inverter circuit via optocoupler by output end O2
102。
Here, the first NAND gate U1 and the second NAND gate U2 alternately export power frequency ac voltage signal, it may be assumed that first with it is non-
When door U1 output power frequency ac voltage signal, the second NAND gate U2 is not exported；Second NAND gate U2 exports power frequency ac voltage letter
Number when, the first NAND gate U1 is not exported.In order to ensure the first NAND gate U1 and the second NAND gate U2 alternately export industrial frequency AC
It is the 4th defeated to may be coupled to the second NAND gate U2 for voltage signal, in certain embodiments, the output end O1 of the first NAND gate U1
Enter and hold B4, the output end O2 of the second NAND gate U2 may be coupled to the 4th input terminal A4 of the first NAND gate U1.
The first input end C1 of third NAND gate U3 and the second input terminal C2 is connected to the output end O1 of the first NAND gate U1,
Output end O3 is connected to the first input end F1 of the 5th NAND gate U5.
The first input end D1 of 4th NAND gate U4 and the second input terminal D2 is connected to the output end O2 of the second NAND gate U2,
Output end O4 is connected to the first input end F1 of the 6th NAND gate U6.
The first input end E1 of 5th NAND gate U5 is connected to the output end O3 of third NAND gate U3, and the second input terminal E2 is used
In receiving pulse-width signal, output end O5 is for exporting modulated signal.For example, output end O5 can believe modulation via optocoupler
Number it is output to inverter circuit 102.
The first input end F1 of 6th NAND gate U6 is connected to the output end of the 4th NAND gate U4, and the second input terminal F2 is used for
Pulse-width signal is received, output end O6 is for exporting modulated signal.For example, output end O6 can be via optocoupler by modulated signal
It is output to inverter circuit 102.
In some embodiments, modulation circuit 105 can also include the 5th sampling resistor R5, and the of the 5th sampling resistor R5
One end is grounded G, and second end is connected to the output end of PWM controller chip 104.
Here, the 5th NAND gate U5 and the 6th NAND gate U6 alternately export modulated signal.It is exported in the first NAND gate U1
In the case where power frequency ac voltage signal, the 5th NAND gate U5 exports modulated signal；Industrial frequency AC is exported in the second NAND gate U2
In the case where voltage signal, the 6th NAND gate U6 exports modulated signal.Power frequency ac voltage signal and modulated signal can trigger
D. c. voltage signal is converted to ac voltage signal by inverter circuit 102.
In some embodiments, referring to fig. 2, filament supply can also include soft starting circuit 106.Soft starting circuit 106
It is configured as in the case where third NAND gate U3 and the 4th NAND gate U4 do not export modulated signal, controls pulse width modulation controlled
The not output pulse width modulated signal of chip 104.In addition, letter is modulated in an output in third NAND gate U3 and the 4th NAND gate U4
Number, in the case that another does not export modulated signal, 104 output pulse width modulated signal of PWM controller chip.
Fig. 3 is the partial circuit according to the filament supply for electron accelerator of the other embodiment of the utility model
Structural schematic diagram.
As shown in figure 3, soft starting circuit 106 includes first diode D1, the second diode D2, third diode D3, the
One transistor T1 and second transistor T2.In some embodiments, the first transistor T1 and second transistor T2 may include but
It is not limited to bipolar transistor.
The first end of first diode D1 is connected to the output end O3 of third NAND gate U3, and second end is via the 4th resistance r4
It is connected to the coordination electrode of the first transistor T1.The first end of second diode D2 is connected to the output end of the 4th NAND gate U4
O4, second end are connected to the coordination electrode of the first transistor T1 via the 4th resistance r4.The coordination electrode of the first transistor T1 passes through
The second end of first diode D1 and the second end of the second diode D2 are connected to by the 4th resistance r4, first electrode is grounded G, the
Two electrodes are connected to the first end of third diode D3.The first end of third diode D3 is connected to the second of the first transistor T1
Electrode and it is connected to first voltage end VDD1 (such as 5V) via the 5th resistance r5, second end is connected to pulse width modulation controlled core
The first port 1 (abbreviation port 1) of piece 104.The coordination electrode of second transistor T2 is connected to the first crystalline substance via the 6th resistance r6
The second electrode of body pipe T1, first electrode ground connection, second electrode are connected to the (letter of second port 2 of PWM controller chip 104
Claim port 2).
It is arranged between the port 14 of PWM controller chip 104 and ground G it should be pointed out that Fig. 3 is also shown
Potentiometer RP1 and potentiometer RP2.The reference voltage Vref exported between port 14 and ground G for PWM controller chip 104,
For example, 5V.By the expectation electric current of the adjustable filament supply output of potentiometer RP1, pass through the adjustable lamp of potentiometer RP2
The expectation voltage of silk power supply output.The second electrode of second transistor T2 can be via potentiometer RP1 and the 7th resistance r7 connection
To the port of PWM controller chip 104 2.
It should be understood that although Fig. 3 is shown as between port 2 and port 3 and is arranged between port 15 and port 3
There are resistance and capacitor, but it is restrictive that this, which is not,.
In some cases, it is reversed from the electrons that cathode issues and is accelerated back to cathode, this part electronics is referred to as anti-
Hong electronics.In the case where instead there are many Hong electronics, the temperature that anti-Hong electronics generates can maintain temperature required for filament, need at this time
The electric current for reducing filament supply is commonly called as " heater current moves back shelves ".
In some embodiments, referring to Fig. 3, filament supply can also include reference signal modulation circuit 107, be configured as
Reference current signal is modulated according to externally input pulse-width signal filPWM, and then it is defeated to can control filament supply
Electric current out, such as reduce the electric current of filament supply output.Such mode can precisely control filament supply output
Electric current.
For example, reference signal modulation circuit 107 may include optocoupler U7, the first input end I1 of optocoupler U7 is via the 8th electricity
Resistance r8 is connected to external input terminals, and the second input terminal I2 is connected to second voltage end VDD2, and the first output end O71 is connected to pulsewidth
Modulation control chip 104 (such as port 14), second output terminal O72 can be successively via the 9th resistance r9, potentiometer RP1 and
Seven resistance r7 are connected to port 2.
In some embodiments, referring to Fig. 3, filament supply can also include being connected to inverter circuit 102 and pulsewidth modulation
Control the current foldback circuit between chip 104.Current foldback circuit includes the tenth resistance r10 and third transistor T3.Third
The coordination electrode of transistor T3 is connected to inverter circuit 102 via the tenth resistance r10, and first electrode is grounded G, second electrode connection
To port 5.
Fig. 4 is the partial circuit according to the filament supply for electron accelerator of the utility model still other embodiments
Structural schematic diagram.
As shown in figure 4, inverter circuit 102 includes first switch Q1, second switch Q2, the switch of third switch Q3 and the 4th
Q4.In some embodiments, first switch Q1, second switch Q2, third switch Q3 and the 4th switch Q4 are including but not limited to exhausted
Edge grid bipolar junction transistor (IGBT).
The coordination electrode (such as via optocoupler) of first switch Q1 is connected to the output end O5 of the 5th NAND gate U5, the first electricity
Pole is connected to the first DC output end N3 of rectification circuit 101, and second electrode is connected to the first exchange output of inverter circuit 102
Hold M1.
The coordination electrode (such as via optocoupler) of second switch Q2 is connected to the output end O6 of the 6th NAND gate U6, the first electricity
Pole is connected to the first ac output end of inverter circuit 102, second electrode (such as rectification is connected to via eleventh resistor r11)
Second DC output end N4 of circuit 101.
The coordination electrode (such as via optocoupler) of third switch Q3 is connected to the output end O2 of the second NAND gate U2, the first electricity
Pole is connected to the first DC output end N3 of rectification circuit 101, and second electrode is connected to the second exchange output of inverter circuit 102
Hold M2.
The coordination electrode (such as via optocoupler) of 4th switch Q4 is connected to the output end O1 of the first NAND gate U1, the first electricity
Pole is connected to the second ac output end M2 of inverter circuit 102, second electrode (such as be connected to via eleventh resistor r11) whole
Second DC output end N4 of current circuit 101.
In some embodiments, referring to fig. 4, inverter circuit 102 can also include at least one protection circuit 112.Below
Protection circuit 112 is introduced by taking first switch Q1 as an example, the connection relationship class of other protection circuits 112 and respective switch
Seemingly.
Protecting circuit includes resistance r12, resistance r13, diode D4 and voltage-stabiliser tube V4.The first end of resistance r12, diode
The first end of the first end of D4, the first end of resistance r13 and voltage-stabiliser tube V4 is connected to the coordination electrode of first switch Q1, resistance
The second end of r14 and the second end (such as via optocoupler) of diode D4 are connected to the output end O5 of the 5th NAND gate U5, resistance
The second end of r13 and the second end of voltage-stabiliser tube V4 are connected to the second electrode of first switch Q1.
The utility model additionally provides a kind of electron accelerator, and electron accelerator may include any one above-mentioned embodiment
The filament supply for electron accelerator.
So far, each embodiment of the utility model is described in detail.In order to avoid covering the design of the utility model,
Some details known in the field are not described.Those skilled in the art as described above, completely it can be appreciated how
Implement technical solution disclosed herein.
Although being described in detail by some specific embodiments of the example to the utility model, this field
It is to be understood by the skilled artisans that above example merely to be illustrated, rather than in order to limit the scope of the utility model.This
Field it is to be understood by the skilled artisans that can not depart from the scope of the utility model and spirit in the case where, to above embodiments
It modifies or some technical features can be equivalently replaced.The scope of the utility model is defined by the following claims.
Claims (11)
1. a kind of filament supply for electron accelerator, comprising:
Rectification circuit is configured as power frequency ac voltage signal being converted to d. c. voltage signal；
Inverter circuit is configured as the d. c. voltage signal being converted to ac voltage signal and export；
Sample circuit is configured as at least one of the current signal exported to the inverter circuit and voltage signal and adopts
Sample, to obtain at least one of current sampling signal and voltage sampling signal；
PWM controller chip is configured as the duty ratio of the pulse-width signal of adjustment output, until the current sample
The voltage of voltage or the voltage sampling signal that the voltage of signal is equal to reference current signal is equal to reference voltage signal
Voltage；
Modulation circuit is configured as: the power frequency ac voltage signal is modulated according to the pulse-width signal, with
To modulated signal；The power frequency ac voltage signal and the modulated signal are output to the inverter circuit, described in triggering
The d. c. voltage signal is converted to ac voltage signal by inverter circuit.
2. filament supply according to claim 1, wherein between the current sampling signal and the reference current signal
The absolute value of voltage difference be the first value, voltage difference between the voltage sampling signal and the reference voltage signal
Absolute value is second value；
The PWM controller chip is configured as adjusting output in the case where first value is greater than the second value
The duty ratio of pulse-width signal, until the current sampling signal is equal to the reference current signal；It is small in first value
In the case where the second value, the duty ratio of the pulse-width signal of output is adjusted, until the voltage sampling signal is equal to
The reference voltage signal.
3. filament supply according to claim 1 or 2, wherein the power frequency ac voltage signal is first node and the
Voltage signal between two nodes；
The modulation circuit includes:
First sampling resistor, the first end ground connection of first sampling resistor, second end are connected to described the via first resistor
One node；
Second sampling resistor, the first end ground connection of second sampling resistor, second end is connected to described whole via second resistance
First DC output end of current circuit；
Third sampling resistor, the first end ground connection of the third sampling resistor, second end are connected to described the via 3rd resistor
Two nodes；
First NAND gate, the first input end of first NAND gate are connected to the second end of first sampling resistor, and second
Input terminal is connected to the second end of second sampling resistor for receiving power supply voltage signal, third input terminal, and output end is used
In the output power frequency ac voltage signal；
Second NAND gate, the first input end of second NAND gate are connected to the second end of the third sampling resistor, and second
For input terminal for receiving the power supply voltage signal, third input terminal is connected to the second end of second sampling resistor, output
End is for exporting the power frequency ac voltage signal；
Third NAND gate, the first input end and the second input terminal of the third NAND gate are connected to the defeated of first NAND gate
Outlet；
4th NAND gate, the first input end and the second input terminal of the 4th NAND gate are connected to the defeated of second NAND gate
Outlet；
The first input end of 5th NAND gate, the 5th NAND gate is connected to the output end of the third NAND gate, and second is defeated
Enter end for receiving the pulse-width signal, output end is for exporting the modulated signal；
The first input end of 6th NAND gate, the 6th NAND gate is connected to the output end of the 4th NAND gate, and second is defeated
Enter end for receiving the pulse-width signal, output end is for exporting the modulated signal.
4. filament supply according to claim 3, wherein the output end of first NAND gate be connected to described second with
4th input terminal of NOT gate, the output end of second NAND gate are connected to the 4th input terminal of first NAND gate.
5. filament supply according to claim 3, further includes:
Soft starting circuit is configured as not exporting the modulated signal in the third NAND gate and the 4th NAND gate
In the case of, it controls the PWM controller chip and does not export the pulse-width signal.
6. filament supply according to claim 5, wherein the soft starting circuit includes:
First diode, the first end of the first diode are connected to the output end of three NAND gate；
Second diode, the first end of second diode are connected to the output end of the 4th NAND gate；
The coordination electrode of the first transistor, the first transistor is connected to the second of the first diode via the 4th resistance
The second end at end and second diode, first electrode ground connection；
Third diode, the first end of the third diode are connected to the second electrode of the first transistor and via
Five resistance are connected to first voltage end, and second end is connected to the first port of the PWM controller chip；
The coordination electrode of second transistor, the second transistor is connected to the second of the first transistor via the 6th resistance
Electrode, first electrode ground connection, second electrode are connected to the second port of the PWM controller chip.
7. filament supply according to claim 3, wherein the inverter circuit includes:
First switch, the coordination electrode of the first switch are connected to the output end of the 5th NAND gate, first electrode connection
To the first DC output end of the rectification circuit, second electrode is connected to the first ac output end of the inverter circuit；
Second switch, the coordination electrode of the second switch are connected to the output end of the six or five NAND gate, and first electrode connects
It is connected to the first ac output end of the inverter circuit, second electrode is connected to the second DC output end of the rectification circuit；
The coordination electrode of third switch, the third switch is connected to the output end of second NAND gate, first electrode connection
To the first DC output end of the rectification circuit, second electrode is connected to the second ac output end of the inverter circuit；
The coordination electrode of 4th switch, the 4th switch is connected to the output end of first NAND gate, first electrode connection
To the second ac output end of the inverter circuit, second electrode is connected to the second DC output end of the rectification circuit.
8. filament supply according to claim 7, wherein the first switch, the second switch, third switch
It include insulated gate bipolar transistor with the 4th switch.
9. filament supply according to claim 6, wherein the first transistor and the second transistor include bipolar
Transistor.
10. filament supply according to claim 1, further includes:
Reference signal modulation circuit is configured as carrying out the reference current signal according to externally input pulse-width signal
Modulation.
11. a kind of electron accelerator, comprising: the filament electricity for electron accelerator as described in claim 1-10 any one
Source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821756695.6U CN209526936U (en) | 2018-10-29 | 2018-10-29 | Filament supply and electron accelerator for electron accelerator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821756695.6U CN209526936U (en) | 2018-10-29 | 2018-10-29 | Filament supply and electron accelerator for electron accelerator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209526936U true CN209526936U (en) | 2019-10-22 |
Family
ID=68211453
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821756695.6U Withdrawn - After Issue CN209526936U (en) | 2018-10-29 | 2018-10-29 | Filament supply and electron accelerator for electron accelerator |
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| Country | Link |
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| CN (1) | CN209526936U (en) |
Cited By (1)
| 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 |
-
2018
- 2018-10-29 CN CN201821756695.6U patent/CN209526936U/en not_active Withdrawn - After Issue
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 |
| 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 |
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