CN107508581A - A kind of vacuum tube grid-control modulator implementation method based on fiber coupler - Google Patents
A kind of vacuum tube grid-control modulator implementation method based on fiber coupler Download PDFInfo
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- CN107508581A CN107508581A CN201710621826.3A CN201710621826A CN107508581A CN 107508581 A CN107508581 A CN 107508581A CN 201710621826 A CN201710621826 A CN 201710621826A CN 107508581 A CN107508581 A CN 107508581A
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- pulse
- modulation pulse
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- vacuum tube
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/01—Shaping pulses
- H03K5/02—Shaping pulses by amplifying
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The present invention is a kind of implementation method of the vacuum tube grid-control modulator based on fiber coupler.In vacuum tube transmitter simultaneously, it is often necessary to use grid-control modulator and the grid of vacuum tube is modulated to control the work of vacuum tube, grid-control modulator has the problem of high_voltage isolation, high voltage amplifier and waveform quality.The present invention forms low potential modulation pulse and truncation pulse in low-voltage circuit first, and the high_voltage isolation for realizing modulation pulse and truncation pulse using the optical fiber of two groups of fiber couplers and certain length transmits；Secondly, add metal-oxide-semiconductor to be amplified to above-mentioned modulation pulse and shaping using two groups of optically isolated MOSFET driving chips, form high potential high-voltage modulation pulse.The inventive method principle is shown in accompanying drawing.The present invention has the advantages of high pressure, anti-sparking impact due to carrying out high_voltage isolation using optical fiber；Photoelectric device is easily achieved wide pulse width, high working ratio modulator；Output, to drawing shaping circuit, preferably solves the waveform problems for modulating pulse using dual switch.
Description
Technical field
The invention belongs to radar transmitter grid-control modulator techniques.
Background technology
Grid modulation is a kind of conventional modulation system of vacuum tube transmitter.Its basic working method is by controlling
Begin, the conducting sequential of tail cut switch pipe, positively biased power supply and negative bias power supply is added in turn on the grid of travelling-wave tubes, so as to control row
The pulse power output of wave duct.
In vacuum tube transmitter, it is often necessary to use grid-control modulator and the grid of vacuum tube is modulated to control very
The work of blank pipe, grid-control modulator are generally operational on negative electrode high potential (generally tens of thousands of volts), and output pulse amplitude is about
800V or so, in order to control the transmitting or shut-off of transmitting equipment in an orderly manner, whole set equipment is all by sending " start trigger arteries and veins
The transmitting of punching " control emitter, the cut-off of emitter is controlled by sending " truncation trigger pulse ".Meanwhile ensure to launch
Transmission signal quality is general to require that modulation pulse has preferably front and rear edge.Obviously, grid-control modulator simultaneously exist high_voltage isolation,
The problem of high voltage amplifier and waveform quality.
Current grid-control modulator be all by pulse transformer by " start trigger pulse " and " truncation trigger pulse " every
From high-tension circuit is transferred to, high-tension circuit produces " modulation pulse " and " truncation pulse " according to both time differences and pressed again by height
Big and shaping forms high potential high-voltage modulation pulse, and this method pulse transformer volume is big, and high-tension circuit is complicated and is easily disturbed,
Maintainability is poor, to solve these problems, realizes that high_voltage isolation transmits present invention employs optical fiber coupling device, will modulate pulse form
Low-pressure end has been put into circuit, pulse amplifying and shaping feature are only realized in high pressure, reliability has not only been effectively improved but also has dropped
The low bulking value of modulator.
The present invention has the advantages of high pressure, anti-sparking impact due to carrying out high_voltage isolation using optical fiber；Photoelectric device can
To realize the high-speed transfer of wide pulse width pulse signal, it is easy to accomplish high working ratio modulator；Output is whole to drawing using dual switch
Shape circuit, preferably solve the waveform problems of modulation pulse.
The content of the invention
The present invention the content of the invention be：
Employ optical fiber coupling device and realize that high_voltage isolation transmits, modulation pulse shaping circuit has been put into low-voltage circuit
In, pulse amplifying and shaping feature are only realized in high-tension circuit.
Low potential modulation pulse is formed first in low-voltage circuit and truncation pulse, two electric impulse signals are respectively fed to optical fiber
Emitting head realizes electro-optic conversion, and optical signal realizes high_voltage isolation by the optical fiber of certain length and is respectively fed to the light of hot end
Fibre receives head, and optical signal is restored to electric signal by fiber optic receiver, so using two groups of fiber couplers realize modulation pulses with
The high_voltage isolation transmission of truncation pulse；
Secondly, metal-oxide-semiconductor is added to be amplified to above-mentioned modulation pulse and shaping using two groups of optically isolated MOSFET driving chips,
Form high potential high-voltage modulation pulse.The optically isolated MOSFET driving chips of one of which add metal-oxide-semiconductor amplification modulation pulse；Another group
Optically isolated MOSFET driving chips add metal-oxide-semiconductor to carry out truncation shaping to the modulation pulse after amplification, and being finally reached, which improves grid, adjusts arteries and veins
The front and rear purpose along characteristic of punching.The inventive method principle is shown in accompanying drawing.
Brief description of the drawings
Fig. 1 is the vacuum tube grid-control modulator principle block diagram based on fiber coupler.
Fig. 2 is the vacuum tube grid-control modulator electrical schematic diagram based on fiber coupler.
Embodiment
The present invention realization principle be referring to Fig. 2, implementation method：
1st, pulse, the formation of truncation pulse are modulated
Modulation pulse, the modulation pulse of start trigger pulses generation are formed using circuits such as monostable or triggers, truncation is touched
Send out pulse-off modulation pulse；Truncation trigger pulse produces the truncation pulse of 5~30 μ S width simultaneously
2nd, the implementation method of the high-voltage isolating transmission circuit of pulse is modulated
From two unjacketed optical fiber assembled devices and its drive circuit.Optical fiber component device is by electro-optical conversioning device, optical fiber, electric light
Switching device forms.
Drive circuit can use switching tube to realize, the modulated pulse signal that previous step is formed or truncation pulse are sent into
The control pole of electro-optical device, it is amplified to drive electro-optical conversioning device.
Optical fiber transmission modulation pulse and the optical signal of truncation pulse.Fiber lengths are according to the decision of the demand of isolation voltage, light
Fine surface should keep clean, and film sound is climbed in consideration, and every kilovolt of pressure-resistant fiber lengths should be greater than 10mm.
Photoelectric conversion receiver received on high potential modulation pulse, truncation pulse optical signal and revert to electric signal.
3rd, the amplification and shaping of pulse are modulated
The amplification of modulation pulse and shaping circuit are on high potential.The Eg1 of power supply containing positive bias (+400V in figure), negative bias
Power supply-Eg2 (- 400V in figure), accessory power supply+5V, accessory power supply V1 and V2 (general 15V), isolation MOSFET driving chips and
MOS switch pipe and its support circuit.Fig. 2 is shown in wiring.
Modulation pulse via optically isolated MOSFET driving chips D3, C9, R17, V13, remove triggering starting metal-oxide-semiconductor V15, V15
Open-minded, Eg1 (+400V) voltage adds to grid by V19, V17, R25, R26 and adjusts pulse position, and modulation pulse amplitude is amplified.
Similarly, the truncation pulse after high-pressure side light-to-current inversion is via optically isolated MOSFET driving chips D4, C11, R20, V21
Triggering starting metal-oxide-semiconductor V23 is removed, V23 is open-minded, and-Eg2 (- 400V) voltage adds to metal-oxide-semiconductor V15 control by R24, V23, R23, R22
End processed, accelerate metal-oxide-semiconductor V15 shut-off, so as to carry out truncation shaping to modulation pulse.After tested, the shaping circuit causes grid to adjust
The front and rear edge of pulse can be controlled within 50nS.
Transient Suppression Diode V16, V17, V18 protection metal-oxide-semiconductor V15 drain electrode and source electrode will not over-voltage breakdown, transient state suppression
Diode V24, V25, V26 protection metal-oxide-semiconductor V23 processed drain electrode and source electrode will not over-voltage breakdowns.
Claims (2)
- A kind of 1. vacuum tube grid-control modulator implementation method based on fiber coupler, it is characterised in that：It is real using optical fiber component Existing high_voltage isolation, low potential modulation pulse and truncation pulse are formed in low-pressure end, amplifies modulation pulse in high-pressure side and is cut Tail shaping, realize grid-control modulator.
- 2. the vacuum tube grid-control modulator implementation method according to claim 1 based on fiber coupler, it is characterised in that： Optical fiber component is made up of electro-optical conversioning device, optical fiber, electrooptical device, and fiber lengths need to meet isolation voltage requirement；Low Low potential modulation pulse and truncation pulse are formed in potential end and carries out signal amplification using two groups of switching tubes, drives two groups respectively Electro-optical conversioning device；By optical fiber, electrooptical device receives the optical signal of modulation pulse and truncation pulse and reverts to telecommunications Number i.e. modulation pulse and truncation pulse, adds metal-oxide-semiconductor to carry out above-mentioned modulation pulse by two groups of optically isolated MOSFET driving chips Amplification and shaping, high potential high-voltage modulation pulse is formed, wherein, one group of optically isolated MOSFET driving chip adds metal-oxide-semiconductor amplification to adjust Pulse processed；Another group of optically isolated MOSFET driving chip adds metal-oxide-semiconductor to carry out truncation shaping to the modulation pulse after amplification.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710621826.3A CN107508581A (en) | 2017-07-27 | 2017-07-27 | A kind of vacuum tube grid-control modulator implementation method based on fiber coupler |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710621826.3A CN107508581A (en) | 2017-07-27 | 2017-07-27 | A kind of vacuum tube grid-control modulator implementation method based on fiber coupler |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109270026A (en) * | 2018-12-14 | 2019-01-25 | 河北大学 | A kind of near-infrared receives and launch control unit |
| CN110545611A (en) * | 2019-08-09 | 2019-12-06 | 北京纳米维景科技有限公司 | Method for realizing grid control isolation and grid control circuit |
| CN112735932A (en) * | 2020-12-10 | 2021-04-30 | 北京无线电测量研究所 | Digital control pulse modulation circuit for traveling wave tube |
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| CN112735932A (en) * | 2020-12-10 | 2021-04-30 | 北京无线电测量研究所 | Digital control pulse modulation circuit for traveling wave tube |
| CN112735932B (en) * | 2020-12-10 | 2024-02-20 | 北京无线电测量研究所 | Digital control pulse modulation circuit for traveling wave tube |
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Application publication date: 20171222 |