CN112319052A - CIJ ultrahigh-pressure full-automatic closed-loop system and control method thereof - Google Patents
CIJ ultrahigh-pressure full-automatic closed-loop system and control method thereof Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
- B41J2/035—Ink jet characterised by the jet generation process generating a continuous ink jet by electric or magnetic field
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J29/00—Details of, or accessories for, typewriters or selective printing mechanisms not otherwise provided for
- B41J29/38—Drives, motors, controls or automatic cut-off devices for the entire printing mechanism
- B41J29/393—Devices for controlling or analysing the entire machine ; Controlling or analysing mechanical parameters involving printing of test patterns
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/02—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/04—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
- H02H9/045—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage adapted to a particular application and not provided for elsewhere
-
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/005—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by bringing liquid or particles selectively into contact with a printing material
- B41J2/01—Ink jet
- B41J2/015—Ink jet characterised by the jet generation process
- B41J2/02—Ink jet characterised by the jet generation process generating a continuous ink jet
- B41J2002/022—Control methods or devices for continuous ink jet
Abstract
The invention discloses a CIJ ultrahigh-voltage full-automatic closed-loop system and a control method thereof, which relate to the technical field of printing, the system is a full-closed-loop ultra-stable EHT voltage generator system, and the system carries out real-time measurement feedback on the output voltage of a main charging circuit (namely an EHT circuit), so that the output voltage value of the main charging circuit is stable and cannot fluctuate; the system measures and controls the driving current output by the main charging circuit, and when the current is too large, the situation that a deflection plate of the CIJ is possibly short-circuited is shown, and the protection circuit is automatically started in advance; when the demand change of the drive current is generated due to the micro change in the EHT deflection electric field, the full-automatic closed-loop system can automatically adjust the current to stabilize the output voltage. In addition, the system adds a current limiter with safety protection at the output end of the main charging circuit to prevent operators from mistakenly contacting the EHT electrode, thereby improving safety.
Description
Technical Field
The invention relates to the technical field of printing, in particular to a CIJ ultrahigh-pressure full-automatic closed-loop system and a control method thereof.
Background
The CIJ (continueinKjetprinter) is a continuous jet type ink-jet printer, and its working principle is that the ink is continuously jetted from nozzle by means of gear pump pressure, and after the ink is vibrated by piezoelectric ceramic it is broken to form ink drop string with fixed frequency and spaced points, at the same time the ink drop is charged in the charging electrode. The charged ink dots are deflected by a high-voltage electric field generated by a high-voltage deflection plate (EHT deflection plate) and then fly out and fall on the surface of a moving printing medium to form printing contents.
As shown in fig. 1, the dot deflection EHT electric field of the current CIJ inkjet printer is basically implemented by using a charging circuit for CRT cathode ray tube electronic deflection, i.e., a pulse sequence frequency f and amplitude v excite a high-multiple cross-coupled coil through a driving amplifier, and the secondary side of the cross-coupled coil outputs an ac signal to a voltage n multiplier; an ultra-high EHT voltage of 6-7 kilovolts is generated by a voltage n multiplier. This voltage, after passing through a current limiting resistor, is directly connected to the deflection field of the ink dot to cause the charged ink dot to fly in a variable trajectory bend under the influence of the field. The EHT electric field generated in this manner is less stable because the entire generating circuit is an open loop system, and any instability factors, noise, and component variations in the system can cause the EHT voltage to vary. A very small ink filament (visible/invisible to the naked eye) can collapse the EHT voltage established by this method, causing the system to cease operation. Therefore, it is necessary to develop a new ultra-high voltage fully automatic closed loop system with current and voltage control and safety protection.
Disclosure of Invention
The invention provides a CIJ ultrahigh-pressure full-automatic closed-loop system and a control method thereof, and aims to solve the problems in the prior art.
The invention adopts the following technical scheme:
a CIJ ultrahigh-voltage full-automatic closed-loop system comprises a main charging circuit connected with an EHT deflection plate, a central processing unit, a detector, a voltage detector, a current detector and a synthesis amplifier, wherein the voltage detector is used for detecting the output voltage of the main charging circuit, the current detector is used for detecting the output current of the main charging circuit, and the output ends of the voltage detector and the current detector are respectively connected to the positive input end and the negative input end of the synthesis amplifier; the output ends of the synthesis amplifier and the central processor are connected to the input end of the detector, and the input end of the detector is connected to the driver of the main charging circuit.
The voltage detector is connected to the synthesis amplifier through the first integration low-pass filter, the current detector is connected to the synthesis amplifier through the second integration low-pass filter, and the detector is connected to a driver of the main charging circuit through the third integration low-pass filter.
Further, the driver is a sinusoidal driver, and the central processor is connected to the detector through a DAC converter.
Further, the main charging circuit comprises the driver, an EHT coil, a voltage multiplier and a current limiter which are connected in sequence.
The overcurrent short-circuit protection device is characterized by further comprising an overcurrent short-circuit protector, wherein the input end of the overcurrent short-circuit protector is connected to the input end of the current detector, and the output end of the overcurrent short-circuit protector is connected to the central processing unit.
The control method of the ultrahigh pressure full-automatic closed-loop system comprises the ultrahigh pressure full-automatic closed-loop system, and comprises the following steps: the central processing unit sends out an output voltage amplitude value V required by the EHT deflection plate according to the requirementEHTOutputting an integer DiThe DAC converter converts the integer Di into a set voltage Vd(ii) a The current detector and the voltage detector respectively detect the output current and the output voltage of the main charging circuit, and the voltage synthesis amplifier outputs a synthesized signal V according to the filtered current signal and the filtered voltage signal∑(t); the detector is based on the received set voltage VdAnd the resultant signal V∑(t) outputting the setting signal VΦ(t); will set signal VΦ(t) a signal V obtained by filteringsum(t) feeding to a driver for generating a sinusoidal drive signal Vei(t) and feeding to EHT coilA primary stage; the coupled voltage of the EHT coil is amplified to generate a voltage signal VE0(t); a voltage signal epsilon is input at the positive phase input end of the synthesis amplifier through a voltage detector and an integral low-pass filter Ieht(t) inputting the current signal epsilon to the inverting input terminal of the synthesis amplifier through the current detector and the second integrating low-pass filteri(t) outputting a voltage signal VEHT(t); when outputting the voltage signal VEHTWhen the voltage (t) is increased, a voltage signal V is output through negative feedback under the action of an ultrahigh-voltage full-automatic closed-loop systemEHT(t) will decrease and vice versa.
Further, the set voltage Vd=（Di/N）VrefWhere N is the number of bits of the DAC converter, VrefIs the reference voltage of the DAC converter; the setting signal VΦ(t)=Vd-V∑(t)+N∑(t) in which N∑(t) is a noise signal of the synthesized voltage; setting signal VΦ(t) obtaining V after filteringsum(t)=K3∫((Vd-V∑(t)+N∑(t))dt=K3∫((Vd-V∑(t))dt= K3(Vd-V∑) Wherein, K is3Is the gain constant of the integrating low pass filter three.
Further, the sinusoidal driving signal Vei(t)=KsinSinω0(t) wherein KsinIncreasing the voltage of the driver by a constant; omega0=2πf0，f0Is the oscillation frequency of the EHT coil; voltage signal VE0(t)=KsinSinω0(t)mη=VEOpeakSinω0(t), where m is the turns ratio of the secondary and primary of the EHT coil, η is the coupling efficiency of the coil, VEOpeakIs the peak voltage of the secondary of the EHT coil; through a voltage multiplier, an output voltage signal V which is output to an EHT deflection plate is generatedEHT(t)=nVEOpeakWherein n is the amplification factor of the voltage multiplier.
Further, a voltage signal epsilon is input at the non-inverting input end of the synthesis amplifier through a voltage detector and an integrating low-pass filter Ieht(t)=K1∫(nVEOpeak+NEHT(t))dt=K1nVEOpeakWherein, K is1Is the gain constant of the first integral low-pass filter; a current signal epsilon is input to the inverting input end of the synthesis amplifier through a current detector and an integrating low-pass filter IIi(t)=K2∫(i(t)R+Ni(t))dt=K2I (t) R, wherein K2Is the gain constant of the second integral low-pass filter; r is a detection resistor of the current detector, i (t) is the output current of the main charging circuit; thus, the signal V is setΦ(t)=Vd-V∑(t)+N∑(t)= Vd-K1nVEopeaK+K2I (t) R; output voltage signal of main charging circuit
Wherein, in the step (A),
is the gain constant after adjustment; when outputting the voltage signal VEHTWhen the (t) is increased, the output voltage is reduced under the action of the ultrahigh-voltage full-automatic closed-loop system through negative feedback, and vice versa.
Further, when the output requires to increase the current, in a safe current range, the ultrahigh voltage full-automatic closed-loop system can increase the driving current to ensure that the output voltage is unchanged, so that the EHT voltage is not collapsed due to a small current disturbance; when the overcurrent short-circuit protector detects the abnormality when a large driving current is required to maintain the EHT output voltage, the central processing unit outputs an integer Di=0 to cut off the voltage output of the EHT coil.
From the above description of the structure of the present invention, it can be seen that the present invention has the following main advantages:
the present invention is a fully closed loop ultra-stable EHT voltage generator system,
firstly, the method comprises the following steps: the invention carries out real-time measurement feedback on the output voltage of the main charging circuit (namely the EHT circuit), so that the output voltage value of the main charging circuit (EHT circuit) is stable and cannot fluctuate;
secondly, the method comprises the following steps: the invention measures the driving current output by the main charging circuit (namely the EHT circuit), when the current is overlarge, the situation that a deflection plate of the CIJ has a short circuit is shown, and the protection circuit is automatically started in advance; when the demand change of the drive current is generated due to the micro change in the EHT deflection electric field, the full-automatic closed-loop system can automatically adjust the current to stabilize the output voltage.
Thirdly, the method comprises the following steps: the invention adds a safety protection current limiter (more than 60M omega) at the output end of a main charging circuit (EHT circuit), when an operator accidentally touches an EHT electrode, the voltage generated by the system can be instantaneously reduced to below the human body safety voltage of 2V.
Drawings
Fig. 1 is a block diagram of a main charging circuit of a conventional EHT deflector.
Fig. 2 is a block diagram of the high-voltage fully automatic closed loop system according to the present invention.
Description of reference numerals:
the device comprises a central processing unit-1, a DAC-2, a detector-3, an integrating low-pass filter III-4, a driver-5, an EHT coil-6, a voltage multiplier-7, a current detector-8, an integrating low-pass filter II-9, a voltage detector-10, an integrating low-pass filter I11, a synthesis amplifier-12, an overcurrent short-circuit protector-13, a current limiter-14 and an EHT deflection plate-15.
Detailed Description
The following describes embodiments of the present invention with reference to the drawings.
As shown in fig. 2, an ultra-high voltage fully automatic closed loop system of CIJ includes a main charging circuit that is an EHT deflector plate 15. Specifically, the main charging circuit includes a driver 5, an EHT coil 6, a voltage multiplier 7, and a current limiter 14 connected to an EHT deflection plate 15, which are connected in this order, and the driver 5 is a sinusoidal driver.
As shown in fig. 2, the ultrahigh voltage full-automatic closed loop system further includes a central processing unit 1, a detector 3, an integrating low-pass filter three 4, a current detector 8, an integrating low-pass filter two 9, a voltage detector 10, an integrating low-pass filter one 11, a synthesis amplifier 12, and a current short-circuit protector 13.
The detection end of the voltage detector 10 is connected to the main charging circuit and is used for detecting the output voltage of the main charging circuit, and the output end of the voltage detector 10 is connected to the positive input end of the synthesis amplifier 12 through the first integration low-pass filter 11;
the detection end of the current detector 8 is connected to the main charging circuit and is used for detecting the output current of the main charging circuit, and the output end of the current detector 8 is connected to the inverting input end of the synthesis amplifier 12 and the input end of the overcurrent short-circuit protector 13 through the second integrating low-pass filter 9;
the input end of the overcurrent short-circuit protector 13 is connected to the central processing unit 1;
the output end of the synthesis amplifier 12 is connected to the input end of the detector 3, and the output end of the central processing unit 1 is connected to the input end of the detector 3 through the DAC converter 2;
the input of the detector 3 is connected to the driver 5 of the main charging circuit via an integrating low pass filter three 4.
As shown in fig. 2, a control method of the CIJ based on the ultrahigh pressure full-automatic closed-loop system includes the following steps:
(1) the central processing unit 1 sends out an output voltage amplitude value V required by generating the EHT deflection plate 15 according to the requirementEHTOutputting an integer DiThe DAC converter 2 converts the integer Di into a set voltage Vd；
Specifically, a voltage V is setd=（Di/N）Vref （1）
Where N is the number of bits of DAC converter 2, VrefIs the reference voltage of the DAC converter 2.
(2) The current detector 8 detects the output current of the main charging circuit, and inputs the filtered current signal to the inverting input end of the voltage synthesis amplifier 12 and the input end of the current short-circuit protector 13 through the second integrating low-pass filter 9; meanwhile, the voltage detector 10 detects the output voltage of the main charging circuit, and the filtered voltage signal is input to the non-inverting input terminal of the combining amplifier 12 through the first integrating low-pass filter 10.
(3) The synthesis amplifier 12 outputs a synthesis signal V based on the current signal and the voltage signal∑(t) and input to the detector 3.
(4) The detector 3 is responsive to the received set voltage VdAnd the resultant signal V∑(t) obtaining a setting signal VΦ(t)；
Specifically, the signal V is setΦ(t)=Vd-V∑(t)+N∑(t) （2）
Wherein, VdTo set the voltage, V∑(t) is the resultant voltage signal, N∑(t) is a noise signal of the synthesized voltage.
(5) Setting signal V of detector 3Φ(t) is input to an integrating low-pass filter 4 to obtain a signal Vsum(t)；
In particular, the signal Vsum(t)=K3∫((Vd-V∑(t)+N∑(t))dt
=K3∫((Vd-V∑(t))dt
=K3(Vd-V∑) （3）
Wherein K3 is the gain constant of the integrating low-pass filter three (4);
here, because of V∑(t) is a relatively slowly varying signal, so V can be used∑In place of V∑(t)。
(6) The integrating low-pass filter 4 will re-convert the signal Vsum(t) is input to a driver 5, the driver 5 generating a sinusoidal drive signal Vei(t) and to the primary of the EHT coil 6;
in particular, the sinusoidal drive signal Vei(t)=KsinSinω0(t) （4）
Wherein, KsinIs the voltage gain constant of the driver 5; omega0=2πf0，f0For the frequency of oscillation of the EHT coil 6, determined for the coil and core design, generally f0The value of (A) is 100KHZ to 300 KHZ.
(7) The coupled voltage of the EHT coil 6 is amplified to generate a voltage signal VE0(t)；
In particular, the voltage signal VE0(t)=KsinSinω0(t)mη
=VEOpeakSinω0(t) （5）
Where m is the turns ratio of the secondary and primary of the EHT coil, η is the coupling efficiency of the coil, VEOpeak= Ksinm η, the peak voltage of the secondary of the EHT coil.
(8) Through a voltage multiplier 7, an output voltage signal V output to the EHT deflection plate is generatedEHT(t)；
In particular, a voltage signal V is outputEHT(t)=nVEOpeak （6）
Where n is the amplification factor of the voltage multiplier 7.
(9) The voltage signal epsilon is input at the non-inverting input terminal of the synthesis amplifier 12 through the voltage detector 10 and the first integrating low-pass filter 11eht(t)；
In particular, the voltage signal εeht(t)=K1∫(nVEOpeak+NEHT(t))dt
=K1nVEOpeak （7）
Where K1 is the gain constant of the first integrator lowpass filter.
(10) A current signal epsilon is input to the inverting input terminal of the synthesis amplifier 12 through the current detector 8 and the second integrating low-pass filter 9i(t)
In particular, the current signal εi(t)=K2∫(i(t)R+Ni(t))dt
=K2I(t)R； （8）
Wherein, K2Is the gain constant of the second integral low-pass filter; r is the detection resistance of the current detector, i (t) is the output current of the main charging circuit.
(11) Rewriting formula (2) according to formulas (7) and (8));
specifically, the signal V is setΦ(t)=Vd-V∑(t)+N∑(t)
=Vd-K1nVEopeaK+K2I(t)R （9）
(12) Therefore, equation (6) can be rewritten;
obtaining an output voltage of the main charging circuit as:
wherein the content of the first and second substances,
the gain constants of the circuits after adjustment.
When outputting the voltage signal VEHT(t) when there is an increase, the output voltage of the main charging circuit will decrease due to the action of the automatic closed loop system through negative feedback, and vice versa.
(13) In addition, when the output requires current increase, the extra-high voltage full-automatic closed-loop system can increase the driving current within the safe current range to ensure that the output voltage is unchanged, so that the EHT voltage is not collapsed due to a small current disturbance.
(14) In addition, when a large drive current is required to maintain the EHT output voltage and the overcurrent short-circuit protector 13 detects a current abnormality, the cpu 1 outputs the integer Di=0 to cut off the voltage output of the EHT coil 6.
The above description is only an embodiment of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modifications made by using the design concept should fall within the scope of infringing the present invention.
Claims (10)
1. The utility model provides a full-automatic closed loop system of superhigh pressure of CIJ, includes the main charging circuit who connects EHT deflector plate, its characterized in that: the power supply circuit also comprises a central processing unit, a detector, a voltage detector, a current detector and a synthesis amplifier, wherein the voltage detector is used for detecting the output voltage of the main charging circuit, the current detector is used for detecting the output current of the main charging circuit, and the output ends of the voltage detector and the current detector are respectively connected to the positive input end and the negative input end of the synthesis amplifier; the output ends of the synthesis amplifier and the central processor are connected to the input end of the detector, and the input end of the detector is connected to the driver of the main charging circuit.
2. The ultrahigh-pressure full-automatic closed-loop system of the CIJ according to claim 1, characterized in that: the voltage detector is connected to the synthesis amplifier through the first integration low-pass filter, the current detector is connected to the synthesis amplifier through the second integration low-pass filter, and the detector is connected to a driver of the main charging circuit through the third integration low-pass filter.
3. The ultrahigh-pressure full-automatic closed-loop system of the CIJ according to claim 1, characterized in that: the driver is a sinusoidal driver, and the central processor is connected to the detector through a DAC converter.
4. The ultrahigh-pressure full-automatic closed-loop system of the CIJ according to claim 1 or 3, characterized in that: the main charging circuit comprises the driver, an EHT coil, a voltage multiplier and a current limiter which are connected in sequence.
5. The ultrahigh-pressure full-automatic closed-loop system of the CIJ according to claim 1, characterized in that: the overcurrent short-circuit protection device is characterized by further comprising an overcurrent short-circuit protector, wherein the input end of the overcurrent short-circuit protector is connected to the input end of the current detector, and the output end of the overcurrent short-circuit protector is connected to the central processing unit.
6. The control method of the ultrahigh-pressure full-automatic closed-loop system is characterized by comprising the following steps of: comprising an ultra-high pressure fully automatic closed loop according to any of claims 1 to 5The system, the control method includes the following steps: the central processing unit sends out an output voltage amplitude value V required by the EHT deflection plate according to the requirementEHTOutputting an integer DiThe D/A converter converts the integer Di into a set voltage Vd(ii) a The current detector and the voltage detector respectively detect the output current and the output voltage of the main charging circuit, and the voltage synthesis amplifier outputs a synthesized signal V according to the filtered current signal and the filtered voltage signal∑(t); the detector is based on the received set voltage VdAnd the resultant signal V∑(t) outputting the setting signal VΦ(t); will set signal VΦ(t) a signal V obtained by filteringsum(t) feeding to a driver for generating a sinusoidal drive signal Vei(t) and to the primary of the EHT coil; the coupled voltage of the EHT coil is amplified to generate a voltage signal VE0(t); a voltage signal epsilon is input at the positive phase input end of the synthesis amplifier through a voltage detector and an integral low-pass filter Ieht(t) inputting the current signal epsilon to the inverting input terminal of the synthesis amplifier through the current detector and the second integrating low-pass filteri(t) varying the output voltage signal VEHT(t); when outputting the voltage signal VEHTWhen the voltage (t) is increased, a voltage signal V is output through negative feedback under the action of an ultrahigh-voltage full-automatic closed-loop systemEHT(t) will decrease and vice versa.
7. The method for controlling the ultrahigh-pressure fully-automatic closed-loop system according to claim 6, wherein: the set voltage Vd=（Di/N）VrefWhere N is the number of bits of the DAC converter, VrefIs the reference voltage of the DAC converter; the setting signal VΦ(t)=Vd-V∑(t)+N∑(t) in which N∑(t) is a noise signal of the synthesized voltage; setting signal VΦ(t) obtaining V after filteringsum(t)=K3∫((Vd-V∑(t)+N∑(t))dt=K3∫((Vd-V∑(t))dt= K3(Vd-V∑) Wherein, K is3Is an integral low passThe gain of filter three is constant.
8. The method for controlling the ultrahigh-pressure fully-automatic closed-loop system according to claim 7, wherein: the sinusoidal drive signal Vei(t)=KsinSinω0(t) wherein KsinIs the voltage gain constant of the driver; omega0=2πf0，f0Is the oscillation frequency of the EHT coil; voltage signal VE0(t)=KsinSinω0(t)mη=VEOpeakSinω0(t), where m is the turns ratio of the secondary and primary of the EHT coil, η is the coupling efficiency of the coil, VEOpeakIs the peak voltage of the secondary of the EHT coil; through a voltage multiplier, an output voltage signal V which is output to an EHT deflection plate is generatedEHT(t)=nVEOpeakWherein n is the amplification factor of the voltage multiplier.
9. The method for controlling the ultrahigh-pressure fully-automatic closed-loop system according to claim 8, wherein: a voltage signal epsilon is input at the positive phase input end of the synthesis amplifier through a voltage detector and an integral low-pass filter Ieht(t)=K1∫(nVEOpeak+NEHT(t))dt=K1nVEOpeak，Wherein, K1Is the gain constant of the first integral low-pass filter; a current signal epsilon is input to the inverting input end of the synthesis amplifier through a current detector and an integrating low-pass filter IIi(t)=K2∫(i(t)R+Ni(t))dt=K2I (t) R, wherein K2Is the gain constant of the second integral low-pass filter; r is a detection resistor of the current detector, i (t) is the output current of the main charging circuit; thus, the signal V is setΦ(t)=Vd-V∑(t)+N∑(t)= Vd-K1nVEopeaK+K2I (t) R; output voltage signal of main charging circuit
Wherein, in the step (A),
is the gain constant after adjustment; when outputting the voltage signal VEHTWhen the (t) is increased, the output voltage is reduced under the action of the ultrahigh-voltage full-automatic closed-loop system through negative feedback, and vice versa.
10. The method for controlling the ultrahigh-pressure fully-automatic closed-loop system according to claim 9, wherein: when the output requires to increase the current, the extra-high voltage full-automatic closed-loop system can increase the driving current within the safe current range to ensure that the output voltage is unchanged, so that the EHT voltage is not collapsed due to small current disturbance; when the overcurrent short-circuit protector detects the abnormality when a large driving current is required to maintain the EHT output voltage, the central processing unit outputs an integer Di=0 to cut off the voltage output of the EHT coil.
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