CN105307360A - Simulation PWM (Pulse-Width Modulation) light modulation output circuit - Google Patents
Simulation PWM (Pulse-Width Modulation) light modulation output circuit Download PDFInfo
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- CN105307360A CN105307360A CN201510871298.8A CN201510871298A CN105307360A CN 105307360 A CN105307360 A CN 105307360A CN 201510871298 A CN201510871298 A CN 201510871298A CN 105307360 A CN105307360 A CN 105307360A
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Abstract
The invention provides a simulation PWM (Pulse-Width Modulation) light modulation output circuit, including an isolation DC/DC power supply, a digital processing unit circuit, an isolation circuit and a drive circuit. The isolation DC/DC power supply is used for converting external 28VDC into 5VDC to be supplied to the digital processing unit circuit. The digital processing unit circuit is used for processing a collected brightness adjustment signal, obtaining a corresponding PWM duty ratio based on an internal light modulation curve, and outputting a PWM light modulation signal through an EPWM (Enhanced Pulse Width Modulation) port of a digital processing unit. The isolation circuit is used for converting a 3.3V PWM light modulation signal output by the EPWM port of the digital processing unit into a non-isolated power supply 5V PWM light modulation signal, and isolating an internal light modulation signal from an output light modulation signal. The drive circuit is used for amplifying and driving a light modulation signal output by the isolation circuit and sending the processed light modulation signal to subsequent equipment. According to the invention, defects that brightness of illumination terminal equipment makes eyes fatigue and dazzling and the like can be tackled, and the light modulation circuit is free of influences of short-circuit faults of the illumination terminal equipment.
Description
Technical field
The present invention relates to a kind of design producing the PWM dim signal output circuit of adjustable duty cycle, particularly for the one simulation PWM light modulation output circuit having processor.
Background technology
The LED of modern Aviation lighting technology employing low-power consumption, high life, environmental protection is as light source.The power consumption of LED is very low, and in general the operating voltage of LED is 2 ~ 3.6V, and operating current is 0.02 ~ 0.03A, and that is, the power consumption of LED can not more than 0.1W.And not containing ultraviolet and infrared ray in LED light line, radiationless, can not have an impact to health.
Traditional aviation light regulating technology is the mode of linear voltage regulation, but due to the pressure drop of lamp terminal LED light source inconsistent, cause the difference of electric current, thus make the brightness of lighting apparatus and colourity uneven.Long-time use, easily makes pilot produce fatigue, causes the error rate rising of interpretation, manipulation, thus causes " human error " to increase.
PWM light modulation is that one utilizes human eye vision inertia, uses simple digit pulse, repeatedly the light regulating technology of switching LED driver.PWM light regulating technology only needs to provide wide, narrow different digital type pulse, can realize simply changing output current, so evenly, consistent adjustment LED luminance.
Summary of the invention
The object of the present invention is to provide a kind of simulation PWM light modulation output circuit, solved lamp terminal device brightness and make people's kopiopia, the shortcoming such as dazzling, solve terminal illumination equipment and occur that short trouble does not affect the problem of light adjusting circuit.
To achieve these goals, technical scheme of the present invention is as follows: a kind of simulation PWM light modulation output circuit, it is characterized in that described simulation PWM light modulation output circuit comprises isolation DC/DC power supply, convert 5VDC for being powered by outside 28VDC to and supply digital processor circuit; Digital processor circuit, dimming curve is stored in digital processor circuit, digital processor circuit, by after the brightness regulated signal process that collects, obtains corresponding PWM duty ratio according to internal dimming curve, then exports PWM dim signal by the EPWM mouth of digital processing unit; Buffer circuit, converts non-isolated power supply 5VPWM dim signal to by the 3.3VPWM dim signal that the PWM mouth of digital processing unit exports, internal dimming signal is isolated with output light modulation; Drive circuit, after the dim signal amplification exported by buffer circuit, driving, sends follow-up equipment to.
The first capacitor and the first electrolytic capacitor is parallel with between the input of described digital processing unit and ground, first positive output end of described digital processing unit is connected with direct current 1.9V power supply, first positive output end of described digital processing unit is connected with one end of the first resistance, the other end of the first resistance is connected with one end of the first negative output terminal of digital processing unit and the second resistance, another termination direct current ground of the second resistance is also connected with one end of the 3rd resistance, another termination AC deposition of 3rd resistance, the second electrolytic capacitor and the second capacitor is also connected with between direct current ground and direct current 1.9V power supply, first positive output end of digital processing unit is also connected with one end of the first magnetic bead, the other end of the first magnetic bead is connected with interchange 1.9V power supply, AC deposition is connected with the 3rd electrolytic capacitor and the 3rd capacitor with exchanging between 1.9V power supply, second of digital processing unit exports termination direct current 3.3V power supply, second output of digital processing unit is connected with one end of the second magnetic bead, another termination of second magnetic bead exchanges 3.3V power supply, the 4th electrolytic capacitor and the 4th capacitor is connected with between described direct current ground and direct current 3.3V power supply, the 5th electrolytic capacitor and the 5th capacitor is connected with between described AC deposition and interchange 3.3V power supply.
Described drive circuit comprises a triode, the base stage of described triode is connected with the output of buffer circuit by the 4th resistance, the grounded emitter of triode, the 5th resistance is connected with between the emitter of triode and base stage, the collector electrode of triode is connected with one end of the 6th resistance, the other end of the 6th resistance is connected with one end of the grid of field effect transistor and the 7th resistance, another termination 5V power supply of 7th resistance, the source electrode of field effect transistor connects 5V power supply, the voltage-stabiliser tube of two Opposite direction connections is also connected with between the source electrode of field effect transistor and base stage, the drain electrode of field effect transistor connects the output of drive circuit and is connected with one end of the 8th resistance and the negative electrode of a diode, the anode of this diode and the other end ground connection of the 8th resistance.
The present invention utilizes digital processing unit acquisition and processing regulated voltage signal, then exports corresponding PWM dim signal, then through isolating chip insulation blocking, finally by the PWM dimmer circuit design being transferred to terminal illumination equipment after drive circuit amplification, driving.The invention solves lamp terminal device brightness and make people's kopiopia, the shortcoming such as dazzling, solve terminal illumination equipment and occur that short trouble does not affect the problem of light adjusting circuit.The power supply of the Power supply of PWM light adjusting circuit of the present invention and the light modulation drive singal of output is completely isolated, and enough storages meet the dimming curve of human-eye visual characteristic, can according to the change of dim signal, export the brightness of illumination meeting human-eye visual characteristic to control, and simply, efficiently can revise dimming curve, from the relation changing dim signal and brightness of illumination.The present invention can meet the requirement of airborne equipment to operational environment and security reliability aspect, and in circuit design fairly simple feasible, cost is not high, has practicality.
Advantage of the present invention is:
1. the corresponding relation curve can changed brightness regulated signal easily and efficiently and export between PWM dim signal, makes it export to meet the brightness of illumination of human-eye visual characteristic.
2., when short trouble appears in terminal illumination equipment, can not have an impact to lighting network control.
Accompanying drawing explanation
Fig. 1 is electrical principle block diagram representation of the present invention.
Fig. 2 is the circuit diagram of the DC/DC power supply of isolation DC/DC power supply of the present invention and non-isolated.
Fig. 3 is the peripheral circuit diagram of digital processing unit of the present invention.
Fig. 4 is the circuit diagram of buffer circuit of the present invention.
Fig. 5 is the circuit diagram of drive circuit of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is elaborated.
As shown in Fig. 1 ~ 5, a kind of PWM of simulation light modulation designing circuitry comprises a DC/DC power supply of isolating, the DC/DC power supply of a non-isolated, a digital processor circuit, a buffer circuit and a drive circuit and forms.
A kind of simulation PWM light modulation output circuit, is characterized in that described simulation PWM light modulation output circuit comprises isolation DC/DC power supply, converts 5VDC to supply digital processor circuit for being powered by outside 28VDC; Digital processor circuit, by after the brightness regulated signal process that collects, obtains corresponding PWM duty ratio according to internal dimming curve, then exports PWM dim signal by the PWM mouth of digital processing unit; Buffer circuit, converts non-isolated power supply 5VPWM dim signal to by the 3.3VPWM dim signal that the EPWM mouth of digital processing unit exports, internal dimming signal is isolated with output light modulation; Drive circuit, after the dim signal amplification exported by buffer circuit, driving, sends other equipment to.
The present invention adopts isolation DC/DC power supply to be powered by outside 28VDC and converts 5VDC supply DSP28335 digital processor circuit to; DSP28335 digital processor circuit converts 5VDC to supplying power for input end that 3.3VDC supplies digital processing unit and isolating chip Q101 by buffer circuit LDO; The pwm signal that processor provides by drive circuit amplifies, driver output.Digital processor circuit of the present invention can store the dimming curve meeting human-eye visual characteristic, exports the brightness of illumination meeting human-eye visual characteristic and controls, and simply, efficiently can revise dimming curve, from the relation changing dim signal and brightness of illumination; Buffer circuit can be isolated with output light modulation by internal dimming signal; Drive circuit can drive terminal illumination equipment to make it luminous.
DSP28335 digital processing unit is by after dim signal acquisition process, corresponding PWM duty ratio is obtained according to internal dimming curve, PWM dim signal is exported again by the EPWM mouth of digital processing unit, then 3.3VPWM is converted to non-isolated power supply 5VPWM dim signal by isolating chip Q101, again after drive circuit amplification, driving, send other equipment to.When adopting the DC/DC power supply of isolation mainly to consider that short circuit or other faults appear in device external power supply, do not cause the damage of device interior circuit herein.
Isolation DC/DC power supply powers to inner light adjusting circuit effectively can solve the problem of electromagnetic compatibility and signal disturbing, and Fig. 2 is isolation DC/DC power supply and non-isolation DC/DC power principle figure.As shown in the figure, non-isolation DC/DC power supply comprises three terminal regulator change-over circuit, the output of three terminal regulator change-over circuit is connected with the rear end of buffer circuit, isolation DC/DC power supply comprises electromagnetic interface filter, the output of electromagnetic interface filter is connected with the input of DC/DC power transfer module, DC/DC power transfer module output is then connected with the front end of buffer circuit, the input of electromagnetic interface filter is connected with the input of three terminal regulator change-over circuit, and be connected with the negative electrode of a diode, the anode of diode is connected with the 28V power supply of input, a pressurizer is also connected between the 28V VDD-to-VSS of input.Electromagnetic interface filter U101, can the interference of effective block electromagnetic signal.DC/DC power transfer module U20, supply buffer circuit front end, can ensure, when input power shakiness, still can normally work.Non-isolation DC/DC power supply, adopts three terminal regulator change-over circuit U503, resupplies buffer circuit rear end.The electric power network of isolation DC/DC and non-isolation DC/DC power circuit composition, powers to the two ends of buffer circuit respectively, and when short circuit phenomenon appears in the drive circuit of buffer circuit output, only the output of meeting buffer circuit, can not cause the problem that internal circuit damages.
Fig. 3 is the peripheral circuit diagram of digital processing unit of the present invention.As shown in the figure, the first capacitor C36 and the first electrolytic capacitor C37 is parallel with between the input of described digital processing unit and ground.First positive output end of described digital processing unit is connected with direct current 1.9V power supply, first positive output end of described digital processing unit is connected with one end of the first resistance R17, the other end of the first resistance R17 is connected with one end of the first negative output terminal of digital processing unit and the second resistance R18, another termination direct current ground of the second resistance R18 is also connected with one end of the 3rd resistance R19, another termination AC deposition of 3rd resistance R19, the second electrolytic capacitor C32 and the second capacitor C34 is also connected with between direct current ground and direct current 1.9V power supply, first positive output end of digital processing unit is also connected with one end of the first magnetic bead FB1, the other end of the first magnetic bead FB1 is connected with interchange 1.9V power supply, AC deposition is connected with the 3rd electrolytic capacitor C33 and the 3rd capacitor C35 with exchanging between 1.9V power supply, second of digital processing unit exports termination direct current 3.3V power supply, second output of digital processing unit is connected with one end of the second magnetic bead FB2, another termination of second magnetic bead FB2 exchanges 3.3V power supply, the 4th electrolytic capacitor C38 and the 4th capacitor C40 is connected with between described direct current ground and direct current 3.3V power supply, the 5th electrochemical capacitor C39 device and the 5th capacitor C41 is connected with between described AC deposition and interchange 3.3V power supply.
Fig. 5 is the circuit diagram of drive circuit of the present invention.Described drive circuit comprises a triode Q102, the base stage of described triode Q102 is connected with the output of buffer circuit by the 4th resistance R170, the grounded emitter of triode Q102, the 5th resistance R147 is connected with between the emitter of triode Q102 and base stage, the collector electrode of triode Q102 is connected with one end of the 6th resistance R1210, the other end of the 6th resistance R1210 is connected with one end of the grid of field effect transistor Q205 and the 7th resistance R1209, another termination 5V power supply of 7th resistance R1209, the source electrode of field effect transistor Q205 connects 5V power supply, the voltage-stabiliser tube of two Opposite direction connections is also connected with between the source electrode of field effect transistor Q205 and base stage, the drain electrode of field effect transistor Q205 connects the output of drive circuit and is connected with one end of the 8th resistance R1105 and the negative electrode of a diode D137, the anode of this diode and the other end ground connection of the 8th resistance R1105.
Below only have expressed embodiments of the present invention, it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection range of patent of the present invention should be as the criterion with claims.
Claims (4)
1. simulate a PWM light modulation output circuit, it is characterized in that described simulation PWM light modulation output circuit comprises isolation DC/DC power supply, convert 5VDC for being powered by outside 28VDC to and supply digital processor circuit; Digital processor circuit, by after the brightness regulated signal process that collects, obtains corresponding PWM duty ratio according to internal dimming curve, then exports PWM dim signal by the EPWM mouth of digital processing unit; Buffer circuit, converts non-isolated power supply 5VPWM dim signal to by the 3.3VPWM dim signal that the PWM mouth of digital processing unit exports, internal dimming signal is isolated with output light modulation; Drive circuit, after the dim signal amplification exported by buffer circuit, driving, sends follow-up equipment to.
2. simulation PWM light modulation output circuit as claimed in claim 1, it is characterized in that: non-isolation DC/DC power supply comprises three terminal regulator change-over circuit, the output of three terminal regulator change-over circuit is connected with the rear end of buffer circuit, isolation DC/DC power supply comprises electromagnetic interface filter, the output of electromagnetic interface filter is connected with the input of DC/DC power transfer module, DC/DC power transfer module output is then connected with the front end of buffer circuit, the input of electromagnetic interface filter is connected with the input of three terminal regulator change-over circuit, and be connected with the negative electrode of a diode, the anode of diode is connected with the 28V power supply of input, a pressurizer is also connected between the 28V VDD-to-VSS of input.
3. simulation PWM light modulation output circuit as claimed in claim 1, it is characterized in that: between the input of described digital processing unit and ground, be parallel with the first capacitor and the first electrolytic capacitor, first positive output end of described digital processing unit is connected with direct current 1.9V power supply, first positive output end of described digital processing unit is connected with one end of the first resistance, the other end of the first resistance is connected with one end of the first negative output terminal of digital processing unit and the second resistance, another termination direct current ground of the second resistance is also connected with one end of the 3rd resistance, another termination AC deposition of 3rd resistance, the second electrolytic capacitor and the second capacitor is also connected with between direct current ground and direct current 1.9V power supply, first positive output end of digital processing unit is also connected with one end of the first magnetic bead, the other end of the first magnetic bead is connected with interchange 1.9V power supply, AC deposition is connected with the 3rd electrolytic capacitor and the 3rd capacitor with exchanging between 1.9V power supply, second of digital processing unit exports termination direct current 3.3V power supply, second output of digital processing unit is connected with one end of the second magnetic bead, another termination of second magnetic bead exchanges 3.3V power supply, the 4th electrolytic capacitor and the 4th capacitor is connected with between described direct current ground and direct current 3.3V power supply, the 5th electrolytic capacitor and the 5th capacitor is connected with between described AC deposition and interchange 3.3V power supply.
4. simulation PWM light modulation output circuit as claimed in claim 1, it is characterized in that: described drive circuit comprises a triode, the base stage of described triode is connected with the output of buffer circuit by the 4th resistance, the grounded emitter of triode, the 5th resistance is connected with between the emitter of triode and base stage, the collector electrode of triode is connected with one end of the 6th resistance, the other end of the 6th resistance is connected with one end of the grid of field effect transistor and the 7th resistance, another termination 5V power supply of 7th resistance, the source electrode of field effect transistor connects 5V power supply, the voltage-stabiliser tube of two Opposite direction connections is also connected with between the source electrode of field effect transistor and base stage, the drain electrode of field effect transistor connects the output of drive circuit and is connected with one end of the 8th resistance and the negative electrode of a diode, the anode of this diode and the other end ground connection of the 8th resistance.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510871298.8A CN105307360A (en) | 2015-12-02 | 2015-12-02 | Simulation PWM (Pulse-Width Modulation) light modulation output circuit |
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| CN201510871298.8A CN105307360A (en) | 2015-12-02 | 2015-12-02 | Simulation PWM (Pulse-Width Modulation) light modulation output circuit |
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| CN105307360A true CN105307360A (en) | 2016-02-03 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109618471A (en) * | 2019-01-28 | 2019-04-12 | 顺德职业技术学院 | A kind of light adjusting system and its control method |
| CN110831275A (en) * | 2019-09-11 | 2020-02-21 | 上海欧切斯智能科技有限公司 | LED drive circuit |
| CN111836439A (en) * | 2020-06-23 | 2020-10-27 | 中国民用航空总局第二研究所 | Airport entrance prohibition light-arranging control method and system |
| CN113038658A (en) * | 2019-12-09 | 2021-06-25 | 上海航空电器有限公司 | PWM signal generating circuit structure for aircraft lighting system |
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| CN102917499A (en) * | 2012-10-19 | 2013-02-06 | 西安文理学院 | DC (Direct Current)/DC-based LED (Light Emitting Diode) driving controller for lighting |
| CN203352900U (en) * | 2013-07-16 | 2013-12-18 | 成都新洲航空设备有限责任公司 | Cockpit brightness dimming nonlinear circuit |
| CN203399355U (en) * | 2013-07-03 | 2014-01-15 | 英飞特电子（杭州）股份有限公司 | LED driver and LED lamp |
| CN203466999U (en) * | 2013-04-19 | 2014-03-05 | 深圳晶辰电子科技股份有限公司 | Resistance, voltage and PWM three-in-one LED intelligent dimming circuit |
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2015
- 2015-12-02 CN CN201510871298.8A patent/CN105307360A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102917499A (en) * | 2012-10-19 | 2013-02-06 | 西安文理学院 | DC (Direct Current)/DC-based LED (Light Emitting Diode) driving controller for lighting |
| CN203466999U (en) * | 2013-04-19 | 2014-03-05 | 深圳晶辰电子科技股份有限公司 | Resistance, voltage and PWM three-in-one LED intelligent dimming circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109618471A (en) * | 2019-01-28 | 2019-04-12 | 顺德职业技术学院 | A kind of light adjusting system and its control method |
| CN110831275A (en) * | 2019-09-11 | 2020-02-21 | 上海欧切斯智能科技有限公司 | LED drive circuit |
| CN113038658A (en) * | 2019-12-09 | 2021-06-25 | 上海航空电器有限公司 | PWM signal generating circuit structure for aircraft lighting system |
| CN113038658B (en) * | 2019-12-09 | 2023-08-08 | 上海航空电器有限公司 | PWM signal generation circuit structure for aircraft lighting system |
| CN111836439A (en) * | 2020-06-23 | 2020-10-27 | 中国民用航空总局第二研究所 | Airport entrance prohibition light-arranging control method and system |
| CN111836439B (en) * | 2020-06-23 | 2023-02-07 | 中国民用航空总局第二研究所 | Airport entrance prohibition light-arranging control method and system |
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