CN205352416U - Digit high accuracy star analogue means - Google Patents
Digit high accuracy star analogue means Download PDFInfo
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- CN205352416U CN205352416U CN201521069623.0U CN201521069623U CN205352416U CN 205352416 U CN205352416 U CN 205352416U CN 201521069623 U CN201521069623 U CN 201521069623U CN 205352416 U CN205352416 U CN 205352416U
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- pulse width
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Abstract
Digit high accuracy star analogue means belongs to deep space optics navigation technical field, and aim at solves the inaccurate problem that is difficult to the inquiry with data of measured data that prior art exists. The utility model discloses a host computer communication interface unit, key control unit, LED drive unit and operation display element, key control unit includes core control chip, LED drive unit includes long distance transmission module, drive module and LED lamp, the host computer passes through communication interface to be connected with core control chip, and PC control core control chip produces pulse width modulation signal and luminance demonstration signal that the duty cycle is different, and in the long distance transmission module transmitted drive module to, drive module passed through the pulse width modulation core control chip 1LED lamp of the different duty cycles of received to the pulse width modulation signal of duty cycle difference respectively, luminance shows that signal transmission is to moving the display element synchronization display luminance information.
Description
Technical field
This utility model belongs to deep space means of optical navigation technique field, is specifically related to a kind of numeral high precision star analog.
Background technology
The passive target that typical target is atmospheric reflectance sunlight of modern photodetector, detection magnitude becomes the important indicator evaluating Photodetection system ability volume, it is necessary to this performance is tested；But it is subject to the impact of all uncertain factors, can not get parameter measurements accurately.Therefore still it is important to develop indoor objective magnitude simulator, and along with the development of China's deep space means of optical navigation technique in recent years, high precision star simulator is widely used as the ground calibration system of high accuracy sensor.Conventional star simulator adopts closed loop feedback to control, use permanent light source simulation starlight, simulated light is carried out colour filter, simulation light beam is decayed by the attenuator using different ratio, regulate light energy and divide magnitude, the simulation light beam after decay is adjusted to collimated light beam again, and completes relative calibration by demarcating the difference between neutral filter.But not considering the heat effect of light in said method, when attenuator is after long-time irradiation, its properties all changes, and directly affects the degree of accuracy of simulating stellar magnitude, increases the error of magnitude.It addition, mostly there is the problem that data are difficult to inquire about in existing star simulator.
Utility model content
The purpose of this utility model is in that to propose a kind of numeral high precision star analog, solves the inaccurate problem being difficult to inquire about with data of measurement data that prior art exists.
For achieving the above object, numeral high precision star analog of the present utility model includes communication interface with pc unit, key control unit, LED drive unit and operation display unit；
Described communication interface with pc unit includes host computer and communication interface；Described key control unit includes kernel control chip；Described LED drive unit includes remote long-distance transmission module, drives module and LED；
Described host computer is connected with kernel control chip by communication interface, PC control kernel control chip produces the different pulse width modulating signal of dutycycle and brightness display signal, the pulse width modulating signal that dutycycle is different is transferred in driving module through long-distance transmission module respectively, drives the pulse width modulating signal of the module different duty by receiving to control LED；Described brightness display signal transmission is to running display unit simultaneous display monochrome information.
Described key control unit also includes isolation circuit, the pulse width modulating signal that the dutycycle of described kernel control chip generation is different passes through to isolate the light emitting diode of the internal optocoupler of circuit, indirectly control phototriode, thus the signal of amplification is sent to long-distance transmission module.
Described isolation circuit includes optocoupler, light emitting diode, resistance and audion；Wherein the pulse width modulating signal of kernel control chip output is directly connected to light emitting diode within optocoupler, then with a 3.3K resistant series；The resistance of emitter stage one 3.3K of series connection of the phototriode within optocoupler, then connects the base stage of the audion that model is 9013 again；The resistance of colelctor electrode one 470R of series connection of the phototriode within optocoupler and a light emitting diode, the colelctor electrode finally connecting the audion that above-mentioned model is 9013 ultimately forms loop.
Described long-distance transmission module includes sending adapter and receiving adapter, pulse width modulating signal is sent to transmission adapter, send adapter and pulse width modulating signal is converted to differential signal and by wire transmission to receiving adapter, receive adapter and the differential signal received is converted to pulse width modulating signal and transmits to driving module.
Described transmission adapter model is DS26LS31M, and described reception adapter model is DS26LS32M.
Described driving module is formed the voltage-dropping type constant-current LED controller of a free-running continuous inductive current pattern by PT4115 chip and inductance, current sampling resistor.
Described communication interface is RS232 or RS485.
Described kernel control chip is STM32F1.
Described LED is XLamp type white LED light source.
Described operation display unit includes 51 series monolithics and liquid crystal display screen, and brightness display signal controls display brightness information on described liquid crystal display screen through 51 series monolithics.
The beneficial effects of the utility model are: numeral high precision star analog of the present utility model is by controlling the kernel control chip in host computer operation key control unit, and then control to run 51 series monolithics used by display unit, system adopts loop control theory, to drive module drive electric current to control the brightness flop of LED.Realize remote, in high precision, can single channel regulate and the star analog of multichannel combine regulation.
Control command is passed to key control unit by communication interface by host computer, and key control unit receives control command, performs corresponding control command.In order to ensure the accuracy of control command, control command will adopt multibyte data transmission, and command format is: start bit+device number+channel address+data+check bit.Under the control of host computer, kernel control chip produces different duty pulse width modulating signal, through power drive conversion output, DC source can be obtained by ac rectifier, kernel control chip produces to show that signal passes to display unit and realizes the simultaneous display of monochrome information accordingly simultaneously, and the precision for improving controller output electric current have employed closed-loop control system.Adopt the change of the brightness of pulse width modulation control LED, do not affect the change of LED colourity.Achieving LED luma digitization by the change of PC control magnitude to control, reached high accuracy, the purpose of operation readiness, measurement data is accurate.
Accompanying drawing explanation
Fig. 1 is numeral high precision star analog structured flowchart of the present utility model；
Fig. 2 drives modular circuit structural representation in numeral high precision star analog of the present utility model；
Fig. 3 is numeral high precision star analog medium and long distance transport module structured flowchart of the present utility model.
Fig. 4 is isolation circuit modular structure schematic diagram in numeral high precision star analog of the present utility model.
Detailed description of the invention
Below in conjunction with accompanying drawing, embodiments of the present invention are described further.
Referring to accompanying drawing 1, numeral high precision star analog of the present utility model includes communication interface with pc unit, key control unit, LED drive unit and operation display unit；
Described communication interface with pc unit includes host computer and communication interface；Described key control unit includes kernel control chip；Described LED drive unit includes long-distance transmission module, drives module and LED；
Described host computer is connected with kernel control chip by communication interface, PC control kernel control chip produces the different pulse width modulating signal of dutycycle and brightness display signal, the pulse width modulating signal that dutycycle is different is transferred in driving module through long-distance transmission module respectively, drives the pulse width modulating signal of the module different duty by receiving to control LED；Described brightness display signal transmission is to running display unit simultaneous display monochrome information.
For ensureing the safety of single-chip microcomputer STM32F1, described key control unit also includes isolation circuit, described isolation circuit is arranged on single-chip microcomputer STM32F1 and PT4115 chip chamber, and the pulse width modulating signal that the dutycycle of described kernel control chip generation is different is sent to long-distance transmission module through isolation circuit.
Referring to accompanying drawing 4, described isolation circuit includes optocoupler, light emitting diode, resistance and audion；Wherein the pulse width modulating signal of kernel control chip output is directly connected to light emitting diode within optocoupler, then with a 3.3K resistant series；The resistance of emitter stage one 3.3K of series connection of the phototriode within optocoupler, then connects the base stage of the audion that model is 9013 again；The resistance of colelctor electrode one 470R of series connection of the phototriode within optocoupler and a light emitting diode, the colelctor electrode finally connecting the audion that above-mentioned model is 9013 ultimately forms loop.
Referring to accompanying drawing 3, described long-distance transmission module includes sending adapter and receiving adapter, pulse width modulating signal is sent to transmission adapter, send adapter and pulse width modulating signal is converted to differential signal and by wire transmission to receiving adapter, receive adapter and the differential signal received is converted to pulse width modulating signal and transmits to driving module.
Described transmission adapter model is DS26LS31M, and described reception adapter model is DS26LS32M.
Referring to accompanying drawing 2, described driving module is formed the voltage-dropping type constant-current LED controller of a free-running continuous inductive current pattern by PT4115 chip and inductance, current sampling resistor.
Described communication interface is RS232 or RS485.
Described kernel control chip is STM32F1.
Described LED is XLamp type white LED light source.
Described operation display unit includes 51 series monolithics and liquid crystal display screen, and brightness display signal controls display brightness information on described liquid crystal display screen through 51 series monolithics.
LED in this utility model is a kind of solid electro-optic source, is a kind of semiconductor lighting devices, and its electrology characteristic has very strong discreteness.It has, and volume is little, mechanical strength is big, low in energy consumption, the life-span is long, it is simple to regulable control and the feature such as pollution-free.The realization of LED light-dimming method is divided into two kinds: simulation light modulation and digital dimming, and simulation light modulation is the magnitude of current controlling to flow through LED strip.This voltage that may result in LED strip declines, and causes slight aberration；Pulse width modulation wave light modulation method is based on human eye characteristic that brightness flicker is sensitive not, dark time bright when making load LED lamp.If bright dark frequency is more than 100Hz, what human eye was seen is exactly mean flow rate, rather than LED is in flicker.Pulse width modulation realizes regulating brightness by regulating bright and dark time scale.
The comprehensive LED of analysis dims principle and characteristic thereof, and we devise LED drive circuit, will change LED luminance it is necessary to make current switching change than within the specific limits, in addition it is also necessary to enough power drive.The LED driver part that current electronic market has has many types, how based on constant current output control, according to design requirement and the PT4115 high light modulation ratio LED driver analyzing selection current constant control.
By PT4115 is studied, it is thus understood that this chip can pass through foreign current sampling resistor RSSet LED average current, realized simulation light modulation by DC voltage and realize light modulation by pulse width modulating signal.This utility model only realizes light modulation by pulse width modulating signal.The maximum average current of LED is by being connected to VINResistance R with CSN endSDetermine, output electric current can be turned down to realize light modulation by adding the pulse width modulating signal of variable duty ratio at DIM pin pin, export electric current IOUTComputational methods are:
If high level is less than 2.5V, then output electric current IOUTFor:
Wherein: IOUTOutput electric current for PT4115；
D is the pulse width modulating signal dutycycle added by control system；
VpulseFor the pulse voltage of DIM pin on PT4115.
VINFor power input, it is necessary to connect shunt capacitance nearby.
CSN current sample end, sampling resistor is connected on VINAnd between CSN.
When adjustment lies prostrate at 0.5-2.5 at the high pulse voltage of DIM pin pin, regulate pulse width modulating signal dutycycle and just can change the brightness of LED, outer meeting resistance RSNecessarily, output electric current and the adjustment linear change of pulse width modulating signal dutycycle.May be used without analog voltage for PT4115 device DIM pin to regulate, pin voltage is equally possible between 0.5-2.5 lies prostrate realizes linearity light adjusting control.When the high pulse voltage of DIM pin lies prostrate at 2.5-5, output electric current is the control of constant current, can change the size of its output electric current by changing the size of outer meeting resistance.In PT4115 applies, RSBeing the maximum output current setting LED, by DIM end, LED actual output current can turn arbitrary value down.According to PT4115 specificity analysis, RSAdopting the sampling resistor of 1% precision, LED exports electric current and controls the precision ± 5%.
Data for ensureing magnitude can reflect in time, special employing CH2401288 series dot matrix drawing type liquid crystal display screen, and liquid crystal display screen adopts 240 × 128 matrix liquid-crystal display screen LCD and low-power consumption LED-backlit composition.
This utility model adopts drive circuit and the isolation circuit of Close-loop Control System Design uniqueness, integrates electric current and controls the change of LED lampet brightness.Reach precision high, purpose easy to control.
This utility model passes through pulse width modulated dimmer, and the output electric current of LED can change from 0% to 100%.The brightness of LED is to be determined by the dutycycle of pulse width modulating signal.Such as pulse width modulating signal 25% dutycycle, the average current of LED is the 25% of 0.1/RS.Pulse width modulated dimmer frequency can be set at more than 100Hz.Pulse width modulated dimmer is in that not change the colourity of LED than the advantage of simulation light modulation.PT4115 light modulating frequency is the highest more than 20kH.
Claims (10)
1. numeral high precision star analog, it is characterised in that include communication interface with pc unit, key control unit, LED drive unit and operation display unit；
Described communication interface with pc unit includes host computer and communication interface；Described key control unit includes kernel control chip；Described LED drive unit includes long-distance transmission module, drives module and LED；
Described host computer is connected with kernel control chip by communication interface, PC control kernel control chip produces the different pulse width modulating signal of dutycycle and brightness display signal, the pulse width modulating signal that dutycycle is different is transferred in driving module through long-distance transmission module respectively, drives the pulse width modulating signal of the module different duty by receiving to control LED；Described brightness display signal transmission is to running display unit simultaneous display monochrome information.
2. numeral high precision star analog according to claim 1, it is characterized in that, described key control unit also includes isolation circuit, the pulse width modulating signal that the dutycycle of described kernel control chip generation is different passes through to isolate the light emitting diode of the internal optocoupler of circuit, indirectly control phototriode, thus the signal of amplification is sent to long-distance transmission module.
3. numeral high precision star analog according to claim 2, it is characterised in that described isolation circuit includes optocoupler, light emitting diode, resistance and audion；Wherein the pulse width modulating signal of kernel control chip output is directly connected to light emitting diode within optocoupler, then with a 3.3K resistant series；The resistance of emitter stage one 3.3K of series connection of the phototriode within optocoupler, then connects the base stage of the audion that model is 9013 again；The resistance of colelctor electrode one 470R of series connection of the phototriode within optocoupler and a light emitting diode, the colelctor electrode finally connecting the audion that above-mentioned model is 9013 ultimately forms loop.
4. numeral high precision star analog according to claim 1, it is characterized in that, described long-distance transmission module includes sending adapter and receiving adapter, pulse width modulating signal is sent to transmission adapter, send adapter and pulse width modulating signal is converted to differential signal and by wire transmission to receiving adapter, receive adapter and the differential signal received is converted to pulse width modulating signal and transmits to driving module.
5. numeral high precision star analog according to claim 4, it is characterised in that described transmission adapter model is DS26LS31M, and described reception adapter model is DS26LS32M.
6. numeral high precision star analog according to claim 1, it is characterised in that described driving module is formed the voltage-dropping type constant-current LED controller of a free-running continuous inductive current pattern by PT4115 chip and inductance, current sampling resistor.
7. numeral high precision star analog according to claim 1, it is characterised in that described communication interface is RS232 or RS485.
8. numeral high precision star analog according to claim 1, it is characterised in that described kernel control chip is STM32F1.
9. numeral high precision star analog according to claim 1, it is characterised in that described LED is XLamp type white LED light source.
10. numeral high precision star analog according to claim 1, it is characterised in that described operation display unit includes 51 series monolithics and liquid crystal display screen, brightness display signal controls display brightness information on described liquid crystal display screen through 51 series monolithics.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521069623.0U CN205352416U (en) | 2015-12-21 | 2015-12-21 | Digit high accuracy star analogue means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201521069623.0U CN205352416U (en) | 2015-12-21 | 2015-12-21 | Digit high accuracy star analogue means |
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| Publication Number | Publication Date |
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| CN205352416U true CN205352416U (en) | 2016-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201521069623.0U Expired - Fee Related CN205352416U (en) | 2015-12-21 | 2015-12-21 | Digit high accuracy star analogue means |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107036055A (en) * | 2017-04-12 | 2017-08-11 | 深圳市裕富照明有限公司 | Expanded type lamp socket |
-
2015
- 2015-12-21 CN CN201521069623.0U patent/CN205352416U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107036055A (en) * | 2017-04-12 | 2017-08-11 | 深圳市裕富照明有限公司 | Expanded type lamp socket |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160629 Termination date: 20161221 |