CN103532086A - Over-current protective device actively avoiding peak current of anode of high-power gyrotron - Google Patents
Over-current protective device actively avoiding peak current of anode of high-power gyrotron Download PDFInfo
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- CN103532086A CN103532086A CN201210232735.8A CN201210232735A CN103532086A CN 103532086 A CN103532086 A CN 103532086A CN 201210232735 A CN201210232735 A CN 201210232735A CN 103532086 A CN103532086 A CN 103532086A
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Abstract
The invention belongs to the field of plasma heating and specifically relates to a high-power-gyrotron controlling and protecting system in an electronic cyclotron resonance heating system. The system includes a current sensor, a voltage comparator, a latch, a combinatory logic device, a microcontroller, an optical fiber and an optical-fiber communication module. The current sensor converts current signals of an anode circuit into voltage signals. The voltage signals are compared with threshold values of two paths through the voltage comparator. Over-current threshold values output high level both at an anode peak-current period and an over-current period in normal work and the other path of threshold value judges a the switch-on state of the anode circuit and outputs high level both at the peak-current period and the normal work period and outputs low level when anode voltage is not added. Then the two paths of digital logical signals are sent to the latch and the combinatory logic device for processing. At the peak-current period, the combinatory logic device outputs low level and at the normal work period and also when the anode circuit is over-current, the combinatory logic device outputs high level. Thus the peak-current and normal work time is judged.
Description
Technical field
The invention belongs to plasma heating field, be specifically related to high power gyrotron Control and protection system in a kind of Electron Cyclotron Resonance Heating system.
Background technology
Electron Cyclotron Resonance Heating is a kind of important heater means in magnetic confinement fusion research.3MW Electron Cyclotron Resonance Heating system is equipped with at HL-2A device.The physics realizations such as research plasma transport, inhibition hydromagnetic instability need the modulation of electron cyclotron wave power high frequency.
By modulation gyrotron anode voltage, can realize the modulation of output microwave power.Anode voltage is in opening process, and anode loop distributed constant causes that anode loop exists the peak current that powers on that is several times as much as running current.The anode voltage rate of climb is faster, and peak current is larger.In order to protect the safety of gyrotron, conventionally to anode current, protection threshold values is set.Threshold value is too high, and normal guard time is longer, likely damages gyrotron; Threshold value is too low, and the peak current that powers on can cause overcurrent protection.Anode peak current is one of key factor of restriction high power gyrotron power modulation frequency.
Conventional solution, for introducing time delay device, is avoided spike when powering on, and makes threshold value can not be subject to the impact of peak current, for operating current setting.Mainly, delay time is difficult for determining the problem that this method exists, if delay time is too short, is not enough to avoid spike, and mistake protection occurs; Time is oversize, may cause and leak protection, and the time span of each spike is also inconsistent, more difficult definite delay time.In order to improve power modulation frequency, the present invention has developed a kind of peak current and has initiatively avoided current foldback circuit.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of new over-current protection method, causes the problem of overcurrent protection to solve anode peak current, thereby improves gyrotron microwave power modulating frequency.
In order to realize this purpose, the technical scheme that the present invention takes is that a kind of high power gyrotron anode peak current is initiatively avoided overcurrent protective device, mainly current sensor, voltage comparator, latch, combinational logic, microcontroller, optical fiber and optical fiber communication module, consists of;
Current sensor is converted to voltage signal anode loop current signal; Then by two voltage comparators, this voltage signal and two-way threshold value being compared to ，Yi road is overcurrent protection threshold value, during anode peak current and during normal operation, the overcurrent phase all can export high level; Another road threshold value is used for judging anode loop opening state, during peak current, all can export high level, output low level during anode voltage does not add with normal work period; Then this two-way digital logic signal is sent into latch and combinational logic is processed, the logical signal of over-current signal and latch output enters combinational logic and carries out computing, Combinational logic output low level during peak current is exported high level when normal work period and anode loop overcurrent; Thereby judgement peak current and normal working hours realize during anode peak current, do not carry out overcurrent protection; In normal work period, carry out overcurrent protection; Finally this signal is given electron cyclotron heating Integrated Protection System through optical fiber, for the protection of gyrotron safety; Microcontroller and optical fiber communication module are for long-range protection threshold values and the monitoring over current protection device state of arranging.
Peak current of the present invention is initiatively avoided device and has been solved gyrotron power high frequency when modulation, and anode peak current causes the problem of overcurrent protection.Introduce after over-current protection method of the present invention, can improve gyrotron power modulation frequency, for carrying out magnetically confined plasma, transport research, high frequency modulated electronics Hui ethnic group current drives and suppress the forward position experiments such as hydromagnetic instability and lay a good foundation.
Accompanying drawing explanation
Fig. 1 is that peak current is initiatively avoided overcurrent protection principle schematic;
Fig. 2 is that peak current is initiatively avoided overcurrent protector experiment measuring oscillogram.
In figure: 1-current sensor; 2-voltage comparator; 3-voltage comparator; 4-latch; 5-combinational logic; 6-digital fiber; 7-microcontroller; 8-optical fiber communication module, 9-electron cyclotron heating Integrated Protection System.
Embodiment
Below in conjunction with accompanying drawing, peak current of the present invention is initiatively avoided to the technical scheme that over-current protection method takes and is described further:
As shown in Figure 1, a kind of high power gyrotron anode peak current is initiatively avoided overcurrent protective device, mainly current sensor, voltage comparator, latch, combinational logic, microcontroller, optical fiber and optical fiber communication module, consists of.
Current sensor is converted to voltage signal anode loop current signal;
Then by two voltage comparators, this voltage signal and two-way threshold value being compared to ，Yi road is overcurrent protection threshold value, during anode peak current and during normal operation, the overcurrent phase all can export high level; Another road threshold value is used for judging anode loop opening state, during peak current, all can export high level, output low level during anode voltage does not add with normal work period;
Then this two-way digital logic signal is sent into latch and combinational logic is processed, the logical signal of over-current signal and latch output enters combinational logic and carries out computing, Combinational logic output low level during peak current is exported high level when normal work period and anode loop overcurrent; Thereby judgement peak current and normal working hours realize during anode peak current, do not carry out overcurrent protection; In normal work period, carry out overcurrent protection;
Finally this signal is given electron cyclotron heating Integrated Protection System through optical fiber, for the protection of gyrotron safety;
Microcontroller and optical fiber communication module are for long-range protection threshold values and the monitoring over current protection device state of arranging.
Fig. 2 is that peak current is initiatively avoided overcurrent protector experiment measuring oscillogram.Channel oscilloscope 2 is for being used the anode current signal of signal generator simulation, and anode current exists very large peak current during powering on, and in normal work period, has overcurrent.Passage 4 is the circuit normal operation difference of identification automatically, during peak current, is low level with anode blocking interval, in normal work period, is high level.The guard signal that passage 3 is exported for overcurrent protector, finds out from waveform, during peak current, and the output of unprotect signal, the overcurrent in normal work period is arrived by correct detection.This circuit has been realized peak current and has initiatively been avoided.
The difference that peak current of the present invention is initiatively avoided over-current protection method and immediate prior art is mainly: with respect to conventional over-current protection method; under same protection threshold values condition, peak current of the present invention is initiatively avoided overcurrent protection and during anode peak current, is not gone out output overcurrent guard signal.Use conventional overcurrent protection, for output overcurrent guard signal not during peak current, more than protection threshold values need to being brought up to peak current, the guard time while making to work is elongated, likely jeopardizes the safety of gyrotron.Because power modulation frequency is higher, peak current is larger, thereby conventional over-current protection method has also limited microwave power modulating frequency.The invention solves the problem that anode peak current causes mistake protection, can improve microwave power modulating frequency.
With respect to avoid the over-current protection method of peak current with time delay device, method of the present invention can be only according to during the overcurrent protection of anode current automatic decision and normal work period.Peak current of the present invention is initiatively avoided over-current protection method without time delay device, does not need to introduce anode and opens signal, has avoided delay time to be difficult for definite problem.The present invention has simplified circuit to a certain extent, has avoided, because delay time arranges the unreasonable leakage protection causing, having improved the safety and reliability of electron cyclotron system.
Claims (1)
1. high power gyrotron anode peak current is initiatively avoided an overcurrent protective device, it is characterized in that: mainly current sensor, voltage comparator, latch, combinational logic, microcontroller, optical fiber and optical fiber communication module, consist of;
Current sensor is converted to voltage signal anode loop current signal;
Then by two voltage comparators, this voltage signal and two-way threshold value being compared to ，Yi road is overcurrent protection threshold value, during anode peak current and during normal operation, the overcurrent phase all can export high level; Another road threshold value is used for judging anode loop opening state, during peak current, all can export high level, output low level during anode voltage does not add with normal work period;
Then this two-way digital logic signal is sent into latch and combinational logic is processed, the logical signal of over-current signal and latch output enters combinational logic and carries out computing, Combinational logic output low level during peak current is exported high level when normal work period and anode loop overcurrent; Thereby judgement peak current and normal working hours realize during anode peak current, do not carry out overcurrent protection; In normal work period, carry out overcurrent protection;
Finally this signal is given electron cyclotron heating Integrated Protection System through optical fiber, for the protection of gyrotron safety;
Microcontroller and optical fiber communication module are for long-range protection threshold values and the monitoring over current protection device state of arranging.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210232735.8A CN103532086B (en) | 2012-07-06 | 2012-07-06 | A kind of high power gyrotron anode peak current active avoidance overcurrent protective device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210232735.8A CN103532086B (en) | 2012-07-06 | 2012-07-06 | A kind of high power gyrotron anode peak current active avoidance overcurrent protective device |
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| Publication Number | Publication Date |
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| CN103532086A true CN103532086A (en) | 2014-01-22 |
| CN103532086B CN103532086B (en) | 2016-12-07 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08126300A (en) * | 1994-10-20 | 1996-05-17 | Matsushita Electron Corp | Driving circuit with protective circuit for power device |
| CN2867678Y (en) * | 2006-01-10 | 2007-02-07 | 陆德昌 | Current foldback and overvoltage protective device |
| JP3918592B2 (en) * | 2002-03-12 | 2007-05-23 | ダイキン工業株式会社 | Overcurrent protection device, overcurrent protection method and program |
| CN101453824A (en) * | 2007-11-30 | 2009-06-10 | 核工业西南物理研究院 | Anode high voltage power for electronic cyclotron |
| CN201345530Y (en) * | 2008-12-29 | 2009-11-11 | 比亚迪股份有限公司 | Current foldback circuit |
-
2012
- 2012-07-06 CN CN201210232735.8A patent/CN103532086B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08126300A (en) * | 1994-10-20 | 1996-05-17 | Matsushita Electron Corp | Driving circuit with protective circuit for power device |
| JP3918592B2 (en) * | 2002-03-12 | 2007-05-23 | ダイキン工業株式会社 | Overcurrent protection device, overcurrent protection method and program |
| CN2867678Y (en) * | 2006-01-10 | 2007-02-07 | 陆德昌 | Current foldback and overvoltage protective device |
| CN101453824A (en) * | 2007-11-30 | 2009-06-10 | 核工业西南物理研究院 | Anode high voltage power for electronic cyclotron |
| CN201345530Y (en) * | 2008-12-29 | 2009-11-11 | 比亚迪股份有限公司 | Current foldback circuit |
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| CN103532086B (en) | 2016-12-07 |
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