CN105472842A - Analog-voltage light modulation output circuit - Google Patents
Analog-voltage light modulation output circuit Download PDFInfo
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- CN105472842A CN105472842A CN201510871107.8A CN201510871107A CN105472842A CN 105472842 A CN105472842 A CN 105472842A CN 201510871107 A CN201510871107 A CN 201510871107A CN 105472842 A CN105472842 A CN 105472842A
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B47/00—Circuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant
- H05B47/10—Controlling the light source
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses an analog-voltage light modulation output circuit, and the circuit is characterized in that the circuit comprises an isolation DC/DC power supply which is used for converting an external 28V DC power supply into a 5V DC power supply and supplying the 5V DC power to a digital processor circuit; the digital processor circuit, wherein the interior of the digital processor circuit stores a light modulation curve, and the digital processor circuit enables a collected brightness adjustment signal to be processed and then outputs a voltage light modulation signal according to the internal light modulation curve; an isolation circuit which enables the voltage light modulation signal outputted by a digital processor to be converted into an isolated voltage light modulation signal; a DA conversion circuit which outputs a corresponding analog voltage signal according to a digital signal outputted by the isolation circuit; and an operational amplifier drive circuit which enables an analog voltage signal outputted by the DA conversion circuit to be amplified and drives terminal illumination equipment to operate. The circuit can meet the requirements of airborne equipment for a working environment, safety and reliability, is simple and feasible in circuit design, is not high in cost, and is practical.
Description
Technical field
The present invention relates to a kind of design producing the adjustable dim signal output circuit of voltage, particularly for the analog voltage light modulation output circuit using digital processing unit.
Background technology
Traditional aviation light regulating technology is the mode of linear voltage regulation, but due to lamp terminal driving power, cause the power consumption of Linear voltage-adjusting circuit large especially, and then bring the heat dissipation design of device complexity, long-term hot operation makes the life-span of device greatly reduce.As the term suggests linear voltage light modulation voltage linear change always simultaneously, and the visual characteristic of human eye is index variation, and both do not conform at characteristic, make people's kopiopia for a long time, and then affect vision and the perception of people.The low power consumption voltage light modulation meeting human eye characteristic is inexorable trend and the direction of current voltage dimming mode.
Summary of the invention
The object of this invention is to provide a kind of analog voltage light modulation output circuit; utilize digital processing unit acquisition and processing regulated voltage signal; then control DA change-over circuit after isolating chip insulation blocking; export corresponding voltage signal; power operational amplifier amplifies process again, and rear drive is transferred to the analog voltage dimmer circuit design of terminal illumination equipment.
To achieve these goals, technical scheme of the present invention is as follows: a kind of analog voltage light modulation output circuit, it is characterized in that described circuit comprises isolation DC/DC power supply, converts 5VDC to supply digital processor circuit for being powered by outside 28VDC; Digital processor circuit, stores dimming curve in digital processor circuit, digital processor circuit by after the brightness regulated signal process that collects, according to internal dimming curve output voltage dim signal; Buffer circuit, converts the voltage dim signal exporting isolation to by the voltage dim signal that digital processing unit exports; DA change-over circuit, exports corresponding analog voltage signal according to the digital signal that buffer circuit exports; Operational amplifier drive circuit, the analog voltage signal exported by DA change-over circuit amplifies, drives terminal illumination equipment.
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.
Described buffer circuit comprises the first isolating chip and the second isolating chip, the voltage dim signal that digital processing unit exports sends into the voltage dim signal input of DA change-over circuit after the first isolating chip isolation, the chip select signal that digital processing unit exports sends into the chip select signal end of DA change-over circuit after the second isolating chip isolation, the voltage dim signal output of DA change-over circuit is then connected with the positive input terminal of operational amplifier, the output of operational amplifier then connects terminal illumination equipment, the voltage dim signal output of DA change-over circuit connects power supply by the first resistance, simultaneously by the second grounding through resistance, the negative input end of described operational amplifier is by the 3rd grounding through resistance, the 4th resistance is connected between the negative input end of described operational amplifier and output, the output of described operational amplifier passes through capacity earth.
The present invention utilizes digital processing unit acquisition and processing brightness regulated signal, export according to dim signal the brightness of illumination meeting human-eye visual characteristic to control, avoid because power consumption is large, and the high temperature brought, and then bring the heat dissipation design of device complexity, the problem that long-term hot operation makes the life-span of device greatly reduce.The power supply of the Power supply of analog voltage light adjusting circuit and the light modulation drive singal of output is completely isolated, the requirement of airborne equipment to operational environment and security reliability aspect can be met, and in circuit design fairly simple feasible, cost is not high, has practicality.
The invention has the advantages that:
1. digital processing unit can store dimming curve information, can according to the change of dim signal, export the brightness of illumination meeting human-eye visual characteristic to control, the corresponding relation curve can changed brightness regulated signal easily and efficiently and export between analog voltage 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.
3. voltage light adjusting circuit is low in energy consumption, has no special requirements to heat radiation.
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 buffer circuit of the present invention, DA change-over circuit and operational amplifier drive circuit figure.
Below in conjunction with drawings and Examples, the present invention is elaborated.
Embodiment
As shown in Figures 1 to 3, 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, a DA change-over circuit and an operational amplifier drive circuit formation.
A kind of analog voltage light modulation output circuit, is characterized in that described circuit comprises isolation DC/DC power supply, converts 5VDC to supply digital processor circuit for being powered by outside 28VDC; Digital processor circuit, dimming curve is stored in digital processor circuit, digital processor circuit is by after the brightness regulated signal process that collects, export the voltage dim signal meeting the brightness of illumination of human-eye visual characteristic according to internal dimming curve, and simply, efficiently can revise dimming curve; Buffer circuit, converts the voltage dim signal exporting isolation to by the voltage dim signal that digital processing unit exports; DA change-over circuit, exports corresponding analog voltage signal according to the digital signal that buffer circuit exports; Operational amplifier drive circuit, the analog voltage signal exported by DA change-over circuit amplifies, drives terminal illumination equipment.
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.The dimming curve adopted in the present invention and be prior art according to the technology of dimming curve output voltage dim signal, does not repeat them here.
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 buffer circuit of the present invention, DA change-over circuit and operational amplifier drive circuit figure.Described buffer circuit comprises the first isolating chip D117 and the second isolating chip D118, the voltage dim signal SPISIMOA that digital processing unit exports, SPICLKA sends into the voltage dim signal input of DA change-over circuit after the first isolating chip D117 isolates, the chip select signal SPISTEA that digital processing unit exports sends into the chip select signal end of DA change-over circuit after the second isolating chip D118 isolates, the voltage dim signal output of DA change-over circuit is then connected with the positive input terminal of operational amplifier, the output of operational amplifier then connects terminal illumination equipment, the voltage dim signal output of DA change-over circuit connects power supply by the first resistance R601, simultaneously by the second resistance R602 ground connection, the negative input end of described operational amplifier is by the 3rd resistance R801 ground connection, the 4th resistance R802 is connected between the negative input end of described operational amplifier and output, the output of described operational amplifier is by electric capacity C201 ground connection.
The present invention adopts the DC/DC power supply of isolation to be powered by outside 28VDC and converts 5VDC supply digital processor circuit to; Digital signal is transferred to DA change-over circuit by processor after buffer circuit LDO insulation blocking; Corresponding analog voltage is exported to the amplification of operational amplifier drive circuit, driver output by DA change-over circuit.
Digital processing unit is by after dim signal acquisition process; corresponding analog voltage is obtained according to internal dimming curve; isolating chip Q101 insulation blocking is passed through again by SPISIMOA, SPICLKA and SPISTEA port signal of digital processing unit; then being transferred to DA change-over circuit makes it export corresponding analog voltage signal to operational amplifier drive circuit, makes it amplify, drives terminal illumination equipment.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.
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 (3)
1. an analog voltage light modulation output circuit, is characterized in that described circuit comprises isolation DC/DC power supply, converts 5VDC to supply digital processor circuit for being powered by outside 28VDC; Digital processor circuit, stores dimming curve in digital processor circuit, digital processor circuit by after the brightness regulated signal process that collects, according to internal dimming curve output voltage dim signal; Buffer circuit, converts the voltage dim signal exporting isolation to by the voltage dim signal that digital processing unit exports; DA change-over circuit, exports corresponding analog voltage signal according to the digital signal that buffer circuit exports; Operational amplifier drive circuit, the analog voltage signal exported by DA change-over circuit amplifies, drives terminal illumination equipment.
2. analog voltage 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. analog voltage light modulation output circuit as claimed in claim 1, it is characterized in that described buffer circuit comprises the first isolating chip and the second isolating chip, the voltage dim signal that digital processing unit exports sends into the voltage dim signal input of DA change-over circuit after the first isolating chip isolation, the chip select signal that digital processing unit exports sends into the chip select signal end of DA change-over circuit after the second isolating chip isolation, the voltage dim signal output of DA change-over circuit is then connected with the positive input terminal of operational amplifier, the output of operational amplifier then connects terminal illumination equipment, the voltage dim signal output of DA change-over circuit connects power supply by the first resistance, simultaneously by the second grounding through resistance, the negative input end of described operational amplifier is by the 3rd grounding through resistance, the 4th resistance is connected between the negative input end of described operational amplifier and output, the output of described operational amplifier passes through capacity earth.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510871107.8A CN105472842A (en) | 2015-12-02 | 2015-12-02 | Analog-voltage light modulation output circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510871107.8A CN105472842A (en) | 2015-12-02 | 2015-12-02 | Analog-voltage light modulation output circuit |
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| CN105472842A true CN105472842A (en) | 2016-04-06 |
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| CN201510871107.8A Pending CN105472842A (en) | 2015-12-02 | 2015-12-02 | Analog-voltage light modulation output circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109085416A (en) * | 2018-08-10 | 2018-12-25 | 杨巍 | A kind of digitized voltage sensor module |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2015
- 2015-12-02 CN CN201510871107.8A patent/CN105472842A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| 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 |
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109085416A (en) * | 2018-08-10 | 2018-12-25 | 杨巍 | A kind of digitized voltage sensor module |
| CN109085416B (en) * | 2018-08-10 | 2023-08-01 | 湖南凌翔磁浮科技有限责任公司 | Digital voltage sensor module |
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Application publication date: 20160406 |