CN103257339A - Optical driving circuit, pulsed light module and packaging of optical driving circuit and pulsed light module - Google Patents
Optical driving circuit, pulsed light module and packaging of optical driving circuit and pulsed light module Download PDFInfo
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- CN103257339A CN103257339A CN2013101955566A CN201310195556A CN103257339A CN 103257339 A CN103257339 A CN 103257339A CN 2013101955566 A CN2013101955566 A CN 2013101955566A CN 201310195556 A CN201310195556 A CN 201310195556A CN 103257339 A CN103257339 A CN 103257339A
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Abstract
The invention belongs to the technical field of radio navigation and directional transmitters, aims at solving the problems that an existing radar pulse transformer is narrow in band width, large in distortion and the like, and provides an optical driving circuit, a pulsed light module and packaging of the optical driving circuit and the pulsed light module. The pulsed light module (100) comprises a signal input module (1), a light emitting module (2), a light receiving module (3), a signal output module (4) and an optical fiber (5) arranged between the light emitting module (2) and the light receiving module (3) and used for transmitting optical signals. Parts of the circuit and a light path are encapsulated as a whole through pouring sealant, and high-voltage isolated transmission is achieved through the optical fiber. The pulsed light module has the advantages of being wide in band width, fast in response and little in distortion, greatly reduces the size of the pulse transformer, and achieves high-voltages safe isolation. Products encapsulated by the pouring sealant is similar to a normal module, and is simple to use and convenient and fast to replace.
Description
Technical field
The present invention relates to radio navigation and directed transmitter techniques field, more specifically, relate to a kind of pulsed light module, be used for replacing pulse transformer, realize that high pressure is isolated and the pulse signal transmission.
Background technology
Airborne radar wants cube little, and is in light weight, and the volume and weight of transmitter is the key factor of restriction airborne radar miniaturization design.Be the high pressure design of high-voltage power supply, modulator etc. by the principal element of transmitter being carried out deep functional analysis, think influencing the transmitter volume weight.Traditionally high-voltage power supply, modulator design are become the form of fuel tank, utilize liquid medium (as transformer oil, condenser oil) the higher characteristics of dielectric strength relatively, finish the high pressure design to transmitter.And this design is not suitable for airborne equipment, and its main problem is to be difficult to guarantee that volume is little, and secondly lightweight requirement is the hidden danger that leakage of oil is arranged under the complex environment condition of high-altitude.Pulse signal transmission in the radar transmitter at present is extensive use of the pulse transformer of electrical signal form.This transformer is easy to use, is easy to install.
Fig. 1 shows pulse transformer schematic diagram of the prior art.Its principle of work is to utilize magnetic saturation performance unshakable in one's determination the sine voltage of input to be become the transformer of burst pulse shape output voltage.Can be used for the igniting of burner, the triggering of thyristor etc.The pulse transformer structure is that primary winding is enclosed within on the bigger core limb that is built up by siliconized plate of section, and auxiliary winding is enclosed within less being easy on the HI SA highly saturated core limb of section that the permalloy material is made, and in the middle of two posts magnetic shunt path can be set.The relation of voltage and magnetic flux, input voltage u1 is sinusoidal wave, produces sinusoidal magnetic flux Φ 1 in the iron core of left side.Magnetic flux Φ 2 is highly saturated in the iron core of right side, is flat-topped wave, and it only changes near null value, and the saturated definite value that reaches immediately.Moment when Φ 2 mistake null values, in auxiliary winding, just induce extremely steep burst pulse electromotive force e2.
By retrieval, in the prior art, application number is that the Chinese utility model patent of CN201020280963.9 discloses a kind of radar pulse transformer, and described radar pulse transformer comprises secondary winding and elementary winding, and wherein secondary winding and elementary winding layering are on the transverse axis of " H " shape skeleton.Wherein the new-type winding of Cai Yonging makes actual measured value more near theoretical value, improves anti-interference and the reliability of pulse-modulator by the use of impedance matching and filtering circuit." development of compact repeated frequency high-voltage pulse transformer " (" High-Voltage Technology " the 35th the 2nd phase of volume, Li Mingjia etc., the 340-343 page or leaf, in February, 2009) learn the used pulse transformer principle of SINUS series accelerator that research institute (IHCE) develops based on Russian large-current electric, by improving the parameter designing of winding coupled form, off resonance coefficient and high pressure winding, a kind of compact repeated frequency high-voltage pulse transformer has been proposed.This transformer reaches 1.75MV to forming the line single charge, and the pulse transformer can be in stable operation under the 1.65MV during repetition frequency 100Hz.
There is the subject matter of two aspects in pulse transformer at present:
1) bandwidth is low, and distortion is big
Because pulse transformer utilizes electromagnetic principle to carry out energy exchange, makes signal bandwidth limited, when signal frequency was too high, loss strengthened, and wave form distortion is serious.And the signal performance of transmission is lower, and the indexs such as rising edge of the amplitude of signal, Linearity, signal are not too high, not ideal enough.
2) the high pressure isolation performance is poor, and security is low
Pulse transformer utilizes electromagnetic principle to realize energy exchange.In order to improve coupling efficiency, reduce loss, just need the primary and secondary stage distance nearer.But the requirement for high pressure is isolated needs the primary and secondary stage distance far away again.Therefore, satisfying under certain request signal transmission, the high pressure isolation performance becomes limited, and the application scenario of pulse transformer also is restricted.
Summary of the invention
The object of the present invention is to provide a kind of bandwidth height, distortion is little, the high pressure isolation performance is good, security performance is high pulsed light module, reduce its volume and weight, make it to change convenient, fast.
For achieving the above object, the invention provides a kind of adopt casting glue encapsulation, will transmit and receive and solidify all-in-one-piece miniaturization pulsed light module, by transmitter module, receiver module and transmission are formed with optical fiber three parts, and the circuit of this three part and the parts of light path are whole to be one with the casting glue embedding.
According to an aspect of the present invention, the invention provides a kind of light drive circuit for optical fiber high pressure isolation transmission, comprising: two input end Sheffer stroke gate A, two input end Sheffer stroke gate B, two input end Sheffer stroke gate C and two input end Sheffer stroke gate D, capacitor C, capacitor C
1, capacitor C
2, resistance R
X1, resistance R
X2, resistance R
X3, resistance R
X4, resistance R
FAnd LED, the positive pole of LED is via resistance R
FConnect the positive pole of described light drive circuit, the minus earth of LED, capacitor C
1One end connects the positive pole of described light drive circuit, other end ground connection, capacitor C
2An end connect the power pins of positive pole and the two input end Sheffer stroke gate B of described light drive circuit, other end ground connection, the earth terminal ground connection of two input end Sheffer stroke gate A, data are imported described light drive circuit from the input end of two input end Sheffer stroke gate A, two input end Sheffer stroke gate B, two input end Sheffer stroke gate C and these three Sheffer stroke gates of two input end Sheffer stroke gate D respectively have an input end to be connected the output of two input end Sheffer stroke gate A, and another input end of above-mentioned 4 two input end Sheffer stroke gates all connects the positive source of described light drive circuit; Described two input end Sheffer stroke gate B, two input end Sheffer stroke gate C and two input end Sheffer stroke gate D parallel connections, and the output of these three two input end Sheffer stroke gates connects resistance R respectively
X2, resistance R
X3And resistance R
X4, and then and resistance R
X1Connect with the circuit that capacitor C is in parallel, the output terminal after the series connection connects the positive pole of LED.
Use optical fiber to carry out the signal transmission.Have that bandwidth is big, response is fast, the little characteristics of distortion.And owing to used optical fiber, have high pressure resistant, anti-electromagnetic interference (EMI), advantage such as volume is little.
Further, the two input end Sheffer stroke gates of each in this light drive circuit adopt the Sheffer stroke gate chip 74F3037 of Philips company.
Further, what the LED in this light drive circuit was selected for use is the HFBR-1424 luminotron module of Agilent company, and the operation wavelength that this luminotron module is set is 850nm.
Further, the Optical Receivers that the circuit board for receiving of the use that matches with above-mentioned light drive circuit is selected for use is the HFBR-2422 Optical Receivers of Agilent company, this module receiving sensitivity is set is-24dBm.
According to a further aspect in the invention, the invention provides a kind of pulsed light module of isolating the casting glue encapsulation of transmission based on the optical fiber high pressure, comprise the input terminal, radiating circuit plate, circuit board for receiving and the lead-out terminal that connect successively, also comprise casting glue, described radiating circuit plate and circuit board for receiving is separated from each other, arrange independently, and between radiating circuit plate and circuit board for receiving, also comprise and realize that high pressure isolates optical fiber and the described light drive circuit of transmission; Described radiating circuit plate, circuit board for receiving and optical fiber are one by embedding with casting glue on the whole.
Further, described casting glue is allocated in the following way: adopt through the qualified precision instrumentation of metering and carry out weighing, and leave standstill enough time to bubble and emit fully.
Further, described casting glue is epoxy glue.
Further, pulsed light module and other element all are welded on the printed circuit board (PCB).
The present invention adopts casting glue or special adhesive (for example, can not have the tackifier that influences electrical insulation capability because of bubble) to carry out the housing embedding, when realizing moulding, has further isolated high pressure, has reduced volume and weight.Owing to adopt casting glue to carry out whole embedding, casting glue is excellent electric insulation silica gel, when it is solidified into elastic body, can not produce and shrink and exothermic phenomenon, can completely cut off steam, dust, play the shock-absorbing buffering effect, therefore, its insulating property can completely cut off external electromagnetic interference to the influence of internal circuit and electronic component, make element avoid electromagnetic interference (EMI).Whole pulsed light modular structure compactness, reasonable in design, improved the anti-vibration of pulsed light module and impact property, improved the reliability of pulsed light module.
According to a further aspect in the invention, the present invention also provides a kind of chip that above-mentioned pulsed light module is carried out the encapsulation of I/O terminal, this chip comprises input end and output terminal, is dual inline type 8 pin chips, and each pin of input end is followed successively by: grounding pin GND, signal input pin S
In, grounding pin GND, power pins V
CCEach pin of output terminal is followed successively by: grounding pin GND, signal output pin S
Out, grounding pin GND, and power pins V
CC
Further, when design pin level and signaling interface, adopt self-defining chip specifications design.
In the structure that adopts the whole embedding of above-mentioned integral type, the parts integral body that is about to circuit and light path is on the basis of one with the casting glue embedding, further this pulsed light module is carried out above-mentioned I/O terminal structure design, be the result who after the each side characteristic of taking all factors into consideration small size pulsed light module under the prerequisite of the design philosophy that is limited to reduced volume, obtains, simultaneously, be conducive to for avoiding the anti-inserted component wear that causes that effective solution is provided.
The present invention has following beneficial effect:
Pulsed light module provided by the invention uses optical fiber to carry out the signal transmission, has that bandwidth is big, response is fast, the little characteristics of distortion.And owing to used optical fiber, have high pressure resistant, anti-electromagnetic interference (EMI), advantage such as volume is little.Adopt casting glue to carry out the whole embedding of housing simultaneously.Both reduce the new product volume greatly, realized the high-voltage safety isolation again.Pulsed light module after the embedding of use casting glue only is equivalent to the module of a routine, uses simply, changes convenient, fast.
Pulsed light module provided by the invention is fit to various complex electromagnetic environments.And can adopt the little casting glues such as for example epoxy glue of density to carry out the housing embedding, volume is little, in light weight, can realize the requirement that the short distance high pressure is isolated, to improving radar flexibly, performance is established good foundation stone easily.
Description of drawings
Fig. 1 shows pulse transformer schematic diagram of the prior art;
Fig. 2 shows the functional block diagram according to the pulsed light module of casting glue encapsulation of the present invention;
Fig. 3 shows the structural representation of isolating the pulsed light module of the casting glue encapsulation of transmitting based on the optical fiber high pressure according to of the present invention;
Fig. 4 shows an embodiment who isolates the light drive circuit of transmission for the optical fiber high pressure; And
Fig. 5 shows an embodiment who pulsed light module of the present invention is carried out the chip of I/O terminal structure package design.
Embodiment
Below in conjunction with accompanying drawing the specific embodiment of the present invention is described in detail.
At first referring to Fig. 2.Fig. 2 has illustrated the principle of work block diagram of pulsed light module 100 of the present invention.Pulsed light module 100 comprises light emission module 2, Optical Receivers 3 and the optical fiber 5 of transmitting optical signal between the two.The principle of work of the pulsed light module 100 among the present invention is: at first electric signal is converted to light signal, by Optical Fiber Transmission, again light signal is reduced into electric signal at last again.
Specifically, light emission module 2 mainly comprises signal processing, driving circuit section and electric light conversion portion.The processing (being filtering, shaping) of the pulse signal process signal processing of signal input module 1 input afterwards, deliver to driving circuit section, driving circuit section selects for use bandwidth greater than the driving chip of 100MHz, few peripheral circuit, only need several resistance and electric capacity to get final product fine realization circuit function, driving circuit section drives light emission module 2 work, and electric signal converts light signal to through carrying out the electric light conversion after the optical-electric module.
Light signal is sent to Optical Receivers 3 through Transmission Fibers 5 with few signal attenuation.Optical fiber 5 had both played the effect of transmitting optical signal, played the effect that high pressure is isolated again, and its excellent electric insulation and harmless transmission performances are embodied.
With reference to figure 3, show the structural representation of an embodiment of pulsed light module of isolating the casting glue encapsulation of transmission based on the optical fiber high pressure.From embodiment shown in Figure 3 as can be seen, the pulsed light module of casting glue encapsulation structurally comprises input terminal 201, radiating circuit plate 202, optical fiber (or optical patchcord) 203, circuit board for receiving 204, lead-out terminal 205 and the casting glue 206 that connects successively.Described radiating circuit plate 202 and circuit board for receiving 204 are separated from each other, arrange independently.Radiating circuit plate 202, circuit board for receiving 204 and optical fiber are one by embedding with epoxy glue 206 on the whole, outside only stay six connection terminals be used for the power supply power supply with being connected of other circuit.Dependable performance and volume are little, can realize that safety realizes the isolation of voltage, does not occupy the space again.
In other embodiments, described epoxy glue can be used as suitable casting glue, and certainly, the casting glue that also can adopt other types is thing as an alternative, as long as this selecteed alternative can guarantee insulating property and effect.
In another embodiment, described casting glue is allocated in the following way: carry out the casting glue allotment and the time will adopt through measuring qualified precision instrumentation and to carry out weighing, and leave standstill enough time to bubble and emit fully.Can adopt the mode that vacuumizes in case of necessity.Thereby avoid influencing electrical insulation capability because bubble exists.
Preferably, pulsed light module and other element all are welded on the printed circuit board (PCB), and the radiating circuit plate of radiating circuit plate and the circuit board for receiving of circuit board for receiving are arranged independently of one another, and all are potted in enclosure interior.
Owing to adopt casting glue to carry out whole embedding, casting glue is excellent electric insulation silica gel, when it is solidified into elastic body, can not produce and shrink and exothermic phenomenon, can completely cut off steam, dust, play the shock-absorbing buffering effect, therefore, its insulating property can completely cut off external electromagnetic interference to the influence of internal circuit and electronic component, make element avoid electromagnetic interference (EMI).Whole pulsed light modular structure compactness, reasonable in design, improved the anti-vibration of pulsed light module and impact property, improved the reliability of pulsed light module.
In addition, in other embodiments, because the life-span of pulsed light module depends primarily on the life-span of pulsed light module and components and parts, when the pulsed light module since when aging or performance step-down when fiber power be lower than-during 30dBm, circuit board for receiving can not make pulsed light module performance variation owing to receiving enough luminous powers.Bigger bias current and the higher degree of modulation of use can be aggravated ageing process.Components and parts also catabiosis can occur in use.Therefore, when design and enforcement, can prolong the pulsed light module life by bias current and the lower degree of modulation of use that reduces the pulsed light module.
In another embodiment, the pulsed light module of purchasing is carried out the power aging shaker test, underproof pulsed light module inferior lost efficacy, and good pulsed light module is used in pulsed light module sample even finished product by test.
Based on above-mentioned principle of work and structure, design philosophy and the method for making of the pulsed light module 100 among the present invention are as follows:
(1) electrical quantity, size, applied environment and the effect in on-board radar transmitter and onboard radar system that proposes according to the user adopts optical fiber to carry out the signal transmission and the use casting glue carries out the monolithic case embedding.
(2) need under high-pressure situations, carry out the requirement of safe, the harmless transmission of paired pulses electric signal according to pulsed light module 100, adopt photoelectric conversion module in the signal transmission, radiating circuit plate and circuit board for receiving design separately, thereby avoid high pressure along the situation of the deposited copper transmission on the pcb board material.
In one embodiment of the invention, a kind of embodiment of above-mentioned independent design is:
A. earlier electric impulse signal is handled through signal and delivered to light drive circuit, drive electrooptic conversion module work, launch satisfactory light signal.
B. consider that optical fiber can realize the harmless transmission of signal, good High-Voltage Insulation performance is arranged again, therefore, light signal is through Optical Fiber Transmission.
C. the photoelectric conversion module on the circuit board for receiving receives the light signal of coming through Optical Fiber Transmission, and convert electric signal to, be reduced into the start pulse signal of index requests such as can satisfying pulse width, pulsed frequency, forward position shake and then triggering following circuit working through signal processing, filtering etc.
(3) circuit of pulsed light module 100 is under the situation that satisfies electric parameter and index request, its external shell need satisfy the request for utilization under the condition of high voltage, through taking all factors into consideration each factor, adopt casting glue to carry out the whole embedding of housing, select the casting glue of good electric insulating property for use.The scheme that this employing casting glue carries out the whole embedding of housing has following advantage: protect the work of internal circuit device energy normal reliable on the one hand, also can make integral body avoid the high pressure invasion and attack on the other hand, avoid the influence of factors such as electromagnetic interference (EMI).
(4) design of circuit and light path
1) design of circuit
From the angle of circuit design, most convenient, the most direct circuit design be exactly with all element design on a plank, can save volume like this, save cost, again convenient debugging and installing.But the present invention is owing to require the high pressure under the realization small size situation to isolate, and this just need will take into account the various withstand voltage properties that might influence the material of high pressure isolation performance index when design.So as the instrument of realizing electric property, printed circuit board (PCB) is necessary.Therefore must consideration how well layout and design could realize high pressure isolation index of the present invention.
Circuit board is generally made with copper-coated laminate, will consider from aspects such as electric property, reliability, processing technology requirement and economic targets when flaggy is selected for use.Copper-coated laminate commonly used is to apply copper phenolic aldehyde paper-based laminate, apply copper ring oxygen paper-based laminate, apply copper ring oxygen glass cloth laminated board, apply the copper epoxy phenol aldehyde glass cloth laminated board, apply copper polytetrafluoroethylglass glass cloth laminate and multilayer board with epoxy glass fabric etc., and its characteristic sees the following form.
Table 1 copper clad plate property list
According to the information of table 1, select the teflon copper clad plate among the present invention for use, but its compressive resistance is 1.0kV/mm, realize withstand voltage 30kV, just need the circuit board distance of 30mm, and on the circuit board of 30mm cabling can not be arranged, nothing is electrically connected.
Above-mentioned like this under the situation of having only the 60mm dimensional requirement, only remaining at most 30mm, also to realize transmitting and receiving the circuit design at two ends, be unfavorable for better realizing circuit performance, therefore the present invention adopts and transmits and receives separately design of circuit board, namely adopt two different circuit boards respectively, adopt other technologies to realize high withstand voltage isolation like this, with regard to there being sufficient size to guarantee better to realize the electric property of pulsed light module, be more conducive to whole miniaturization and high the isolation like this on circuit design of the present invention.
2) optical drive and light-receiving
Light drive circuit in order to trigger pip through driver drives luminotron (LED) operate as normal, electric signal is converted to light signal, through Optical Fiber Transmission, after the optical receiving circuit receiver module receives, be reduced into electric signal.
Fig. 4 shows the light drive circuit of isolating transmission for the optical fiber high pressure, is used for an embodiment of the light drive circuit of pulse transformer among this circuit that is the present invention.As shown in Figure 4, the light drive circuit among this embodiment comprises: two input end Sheffer stroke gate A, two input end Sheffer stroke gate B, two input end Sheffer stroke gate C and two input end Sheffer stroke gate D, capacitor C, capacitor C
1, capacitor C
2, resistance R
X1, resistance R
X2, resistance R
X3, resistance R
X4, resistance R
FAnd LED, the positive pole of LED is via resistance R
FConnect the positive pole of described light drive circuit, the minus earth of LED, capacitor C
1One end connects the positive pole of described light drive circuit, other end ground connection, capacitor C
2An end connect the power pins of positive pole and the two input end Sheffer stroke gate B of described light drive circuit, other end ground connection, the earth terminal ground connection of two input end Sheffer stroke gate A, data are imported described light drive circuit from the input end of two input end Sheffer stroke gate A, two input end Sheffer stroke gate B, two input end Sheffer stroke gate C and these three Sheffer stroke gates of two input end Sheffer stroke gate D respectively have an input end to be connected the output of two input end Sheffer stroke gate A, and another input end of above-mentioned 4 two input end Sheffer stroke gates all connects the positive source of described light drive circuit; Described two input end Sheffer stroke gate B, two input end Sheffer stroke gate C and two input end Sheffer stroke gate D parallel connections, and the output of these three two input end Sheffer stroke gates connects resistance R respectively
X2, resistance R
X3And resistance R
X4, and then and resistance R
X1Connect with the circuit that capacitor C is in parallel, the output terminal after the series connection connects the positive pole of LED.
In a preferred embodiment, the two input end Sheffer stroke gates of each in this light drive circuit adopt the Sheffer stroke gate chip 74F3037 of Philips company.Signal is delivered to the 74F3037 integrated circuit after the output of radiating circuit plate, the LED working current is modulated, and data-signal is converted to light pulse signal.The 74F3037 that is used as driver works on off state.When low, 74F3037 is output as low level in the output data, and LED positive terminal current potential is undercuted, and LED is not luminous; When output data when being high, 74F3037 is output as high level, and driving LED is luminous.
In a preferred embodiment, what the LED in this light drive circuit was selected for use is the HFBR-1424 luminotron module of Agilent company, and the operation wavelength that this luminotron module is set is 850nm.Because transmission range is short, loss can be ignored, and only need consider the receiving sensitivity of circuit board for receiving when determining the fiber power that real work needs.
In a preferred embodiment, the Optical Receivers that the circuit board for receiving of the use that matches with above-mentioned light drive circuit is selected for use is the HFBR-2422 Optical Receivers of Agilent company, this Optical Receivers receiving sensitivity is set is-24dBm.Therefore, can consider suitably to reduce the working current of LED, to reduce the serviceable life of power consumption and prolongation LED.When working current reduced, fiber power decreased.When working current was 60mA, fiber power was ratings-12dBm, and when working current was reduced to 35mA, fiber power ratio ratings reduced 3dB, is essentially-15dBm, at this moment, still satisfies the receiving sensitivity needs of circuit board for receiving.In one embodiment, making the working current of LED is about 35mA.
The light that LED sends is gone into optical receiving circuit through Optical Fiber Transmission is laggard, and optical receiving circuit is converted to electric signal in order to the light signal that will receive.In a preferred embodiment, optical receiving circuit is made of integrated Optical Receivers, what select for use is the HFBR-2422 Optical Receivers of Agilent company, the light pulse signal that receives can be converted to electric signal output, omitted outside photoelectric switching circuit, made optical receiving circuit comparatively succinct.
The present invention also provides the paired pulses optical module to carry out the scheme of I/O terminal structure package design.In similar techniques conceptual design in the past, all adopt separate type, the parts that are about to realize performance index such as circuit, light path design separately with whole shell, are convenient to like this install, debugging, maintenance and change.But because the size of pulsed light module is less in the present invention, if adopt traditional separate type, consider that collision etc. relates to the hardness problem, preferably select for use metal material to make shell, but therefore metal material is not suitable for isolating occasion for high pressure owing to its good electric conductivity and not anti-electromagnetic interference (EMI); And if select plastics or other flexible materials of insulation for use, at first can not guarantee enough hardness, secondly because the restriction of processing dimension, just the special mould of design separately is very high to cost requirement.Take all factors into consideration above-mentioned aspect, we adopt the structure of the whole embedding of integral type, and the parts integral body that is about to circuit and light path is one with the casting glue embedding.Carry out particular design by position and layout to input/output port, satisfy the specification of 8 pin dual-in-line components and parts, pin level and signaling interface carry out particular design simultaneously, avoid the anti-inserted component wear that causes.
As shown in Figure 5, be to carry out an encapsulation embodiment obtaining after the I/O terminal structure design.This product adopts modular construction, and by transmitter module, receiver module and Transmission Fibers three parts are formed, and three parts are integral by embedding.Chip to this integral body is carried out the encapsulation of I/O terminal is designed to dual inline type 8 pin chips in the embodiment of Fig. 5 correspondence, each pin of input end is followed successively by: grounding pin GND, signal input pin S
In, grounding pin GND, power pins V
CCEach pin of output terminal is followed successively by: grounding pin GND, signal output pin S
Out, grounding pin GND, and power pins V
CC
Further, when design pin level and signaling interface, adopt self-defining chip specifications design, avoid the anti-inserted component wear that causes.As shown in Figure 5, the three-dimensional dimension of chip can be designed as, and for example (unit: mm), 58 ± 1,28 ± 1,28 ± 1.
Each above embodiment is described preferred implementation of the present invention; be not that scope of the present invention is limited; design under the prerequisite of spirit not breaking away from the present invention; various distortion and improvement that the common engineering technical personnel in this area make technical scheme of the present invention all should fall in the definite protection domain of claims of the present invention.
Claims (10)
1. one kind is used for the light drive circuit that the optical fiber high pressure is isolated transmission, comprising: two input end Sheffer stroke gate A, two input end Sheffer stroke gate B, two input end Sheffer stroke gate C and two input end Sheffer stroke gate D, capacitor C, capacitor C
1, capacitor C
2, resistance R
X1, resistance R
X2, resistance R
X3, resistance R
X4, resistance R
FAnd LED, the positive pole of LED is via resistance R
FConnect the positive pole of described light drive circuit, the minus earth of LED, capacitor C
1One end connects the positive pole of described light drive circuit, other end ground connection, capacitor C
2An end connect the power pins of positive pole and the two input end Sheffer stroke gate B of described light drive circuit, other end ground connection, the earth terminal ground connection of two input end Sheffer stroke gate A, data are imported described light drive circuit from the input end of two input end Sheffer stroke gate A, two input end Sheffer stroke gate B, two input end Sheffer stroke gate C and these three Sheffer stroke gates of two input end Sheffer stroke gate D respectively have an input end to be connected the output of two input end Sheffer stroke gate A, and another input end of above-mentioned 4 two input end Sheffer stroke gates all connects the positive source of described light drive circuit; Described two input end Sheffer stroke gate B, two input end Sheffer stroke gate C and two input end Sheffer stroke gate D parallel connections, and the output of these three two input end Sheffer stroke gates connects resistance R respectively
X2, resistance R
X3And resistance R
X4, and then and resistance R
X1Connect with the circuit that capacitor C is in parallel, the output terminal after the series connection connects the positive pole of LED.
2. light drive circuit according to claim 1 is characterized in that, each the two input end Sheffer stroke gate in this light drive circuit adopt the Sheffer stroke gate chip 74F3037 of Philips company.
3. light drive circuit according to claim 1 is characterized in that, what the LED in this light drive circuit was selected for use is the HFBR-1424 luminotron module of Agilent company, and the operation wavelength that this luminotron module is set is 850nm.
4. light drive circuit according to claim 1, it is characterized in that, the Optical Receivers that the circuit board for receiving that uses of matching with above-mentioned light drive circuit is selected for use is the HFBR-2422 Optical Receivers of Agilent company, this module receiving sensitivity is set is-24dBm.
5. pulsed light module of isolating the casting glue encapsulation of transmission based on the optical fiber high pressure, comprise the input terminal, radiating circuit plate, circuit board for receiving and the lead-out terminal that connect successively, it is characterized in that, also comprise casting glue, described radiating circuit plate and circuit board for receiving is separated from each other, arrange independently, and between radiating circuit plate and circuit board for receiving, also comprise and realize that high pressure is isolated the optical fiber of transmission and according to the described light drive circuit of one of claim 1-4; Described radiating circuit plate, circuit board for receiving and optical fiber are one by embedding with casting glue on the whole.
6. pulsed light module according to claim 5 is characterized in that, described casting glue is allocated in the following way: adopt through the qualified precision instrumentation of metering and carry out weighing, and leave standstill enough time to bubble and emit fully.
7. pulsed light module according to claim 5 is characterized in that, described casting glue is epoxy glue.
8. pulsed light module according to claim 5 is characterized in that, pulsed light module and other element all are welded on the printed circuit board (PCB).
9. chip that any one described pulsed light module of claim 5-8 is carried out I/O terminal encapsulation, this chip comprises input end and output terminal, be dual inline type 8 pin chips, each pin of input end is followed successively by: grounding pin GND, signal input pin Sin, grounding pin GND, power pins VCC; Each pin of output terminal is followed successively by: grounding pin GND, signal output pin Sout, grounding pin GND, and power pins VCC.
10. chip according to claim 9 is characterized in that, when design pin level and signaling interface, adopts self-defining chip specifications design.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114089067A (en) * | 2021-11-17 | 2022-02-25 | 广西电网有限责任公司崇左供电局 | Visual system of electric secondary circuit of transformer substation |
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| CN203385852U (en) * | 2013-05-23 | 2014-01-08 | 中国电子科技集团公司第八研究所 | Light drive circuit, pulse light module and chip |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114089067A (en) * | 2021-11-17 | 2022-02-25 | 广西电网有限责任公司崇左供电局 | Visual system of electric secondary circuit of transformer substation |
| CN114089067B (en) * | 2021-11-17 | 2024-05-28 | 广西电网有限责任公司崇左供电局 | Electrical secondary circuit visualization system of transformer substation |
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|---|---|
| CN103257339B (en) | 2015-09-23 |
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