CN104080228B - The detection control circuit of light fixture electric parameter - Google Patents
The detection control circuit of light fixture electric parameter Download PDFInfo
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- CN104080228B CN104080228B CN201310103717.4A CN201310103717A CN104080228B CN 104080228 B CN104080228 B CN 104080228B CN 201310103717 A CN201310103717 A CN 201310103717A CN 104080228 B CN104080228 B CN 104080228B
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Abstract
Current signal and the voltage signal of light fixture, by current detection module and the operating current of voltage detection module detection light fixture and running voltage, are then converted into digital data transmission to electric parameter comparison module by analog-to-digital conversion module by the detection control circuit of light fixture electric parameter.And electric parameter comparison module has been preset current value and magnitude of voltage.Therefore, voltage signal and the current signal of reception are compared by electric parameter comparison module with the magnitude of voltage preset and current value, and export to electric parameter correcting module by comparing the difference drawn, electric parameter correcting module controls the operating current of light fixture according to the difference received and running voltage convergence is preset current value and magnitude of voltage.Thus realize controlling operating current and the running voltage of light fixture; avoid light fixture that stream, overvoltage, undercurrent and the abnormal phenomena such as under-voltage occurred; simultaneously; tend to determining value owing to the operating current of light fixture can be controlled; it is thus possible to control the brightness of light fixture, and then reach protect light fixture and regulate the effect of lamp brightness.
Description
Technical field
The present invention relates to light fixture electric parameter control circuit, particularly relate to the detection control circuit of a kind of light fixture electric parameter efficient, reliable.
Background technology
Lamp protective circuit is independently of outside light fixture operating circuit, thus, it is to need newly-increased electronic devices and components that light fixture increases protection circuit.It is contemplated that cost savings, light fixture great majority in the market do not provide protection circuit.And for large-scale valuable light fixture, even if adding protection circuit, but the luminescence of light fixture and exception can not be carried out Autonomous test, and after causing increasing light fixture cost, still can not be effectively according to the electric parameter information protection light fixture of light fixture.
Summary of the invention
Based on this, it is provided that the detection control circuit of a kind of light fixture electric parameter efficient, reliable.
A kind of detection control circuit of light fixture electric parameter, for the current electric parameter of light fixture is detected and makes correction, including the current detection module for detecting light fixture operating current signal, for detecting the voltage detection module of lamp working voltage signal, for the operating current signal of light fixture and running voltage signal being converted into the analog-to-digital conversion module of digital signal, for the electric parameter comparison module that the operating current of light fixture and running voltage are compared with the current value preset and magnitude of voltage and be used for the operating current signal to light fixture and electric parameter correcting module that running voltage signal is adjusted；
Described current detection module electrically connects with described analog-to-digital conversion module；Described voltage detection module electrically connects with described analog-to-digital conversion module；Described electric parameter comparison module electrically connects with described analog-to-digital conversion module and described electric parameter correcting module respectively；Described electric parameter correcting module electrically connects with light fixture；
Operating current signal and the running voltage signal of reception are converted into digital signal and export to described electric parameter comparison module by described analog-to-digital conversion module, obtained operating current and running voltage are compared by described electric parameter comparison module with the current value preset and magnitude of voltage, and the differential transmission after comparing gives described electric parameter correcting module, the difference that described electric parameter correcting module export according to described electric parameter comparison module controls the operating current of light fixture and the default current value of running voltage convergence and magnitude of voltage.
Wherein in an embodiment, described current detection module includes current sense resistor Rs and current detecting chip；Described current sense resistor Rs is series between positive source and light fixture, current detecting positive pole and the power end of described current detecting chip all electrically connect with positive source, the current detecting negative pole of described current detecting chip electrically connects with light fixture, and the sample rate current port of described current detecting chip electrically connects with described analog-to-digital conversion module.
Wherein in an embodiment, described current detecting chip is MAX4080.
Wherein in an embodiment, described voltage detection module includes divider resistance R1 and divider resistance R2, one end of described divider resistance R1 electrically connects with the points of common connection of positive source and light fixture, the other end electrically connects with described divider resistance R2, one end ground connection of described divider resistance R2, described divider resistance R1 electrically connects with described analog-to-digital conversion module with the points of common connection of described divider resistance R2.
Wherein in an embodiment, described voltage detection module also includes Zener diode ZD1 and filter capacitor C1, described Zener diode ZD1 is parallel to the two ends of described divider resistance R2, the plus earth of described Zener diode ZD1, and described filter capacitor C1 is parallel to described divider resistance R2 two ends.
Wherein in an embodiment, described analog-to-digital conversion module includes A/D converter, described A/D converter includes input and outfan, the input of described A/D converter electrically connects with described current detection module and described voltage detection module, and the outfan of described A/D converter electrically connects with described electric parameter comparison module.
Wherein in an embodiment, described electric parameter comparison module includes comparator U1 and comparator U2, the current value that the reference edge input of described comparator U1 is preset, the input of described comparator U1 electrically connects with the outfan of described analog-to-digital conversion module, the magnitude of voltage that the reference edge input of described comparator U2 is preset, the input of described comparator U2 electrically connects with the outfan of described analog-to-digital conversion module；The outfan of described comparator U1 and the outfan of described comparator U2 electrically connect with described electric parameter correcting module.
Wherein in an embodiment, described electric parameter correcting module includes microprocessor U3, described microprocessor U3 electrically connects with described electric parameter comparison module and light fixture, described microprocessor U3 controls the operating current of light fixture according to the output difference of described electric parameter comparison module and running voltage convergence is preset current value and magnitude of voltage.
Current signal and the voltage signal of light fixture, by current detection module and the operating current of voltage detection module detection light fixture and running voltage, are then converted into digital data transmission to electric parameter comparison module by analog-to-digital conversion module by the detection control circuit of above-mentioned light fixture electric parameter.And electric parameter comparison module has been preset current value and magnitude of voltage, wherein, the current value preset and magnitude of voltage are ideal current and the voltage of light fixture work.Therefore, voltage signal and the current signal of reception are compared by electric parameter comparison module with the magnitude of voltage preset and current value, and export to electric parameter correcting module by comparing the difference drawn, electric parameter correcting module controls the operating current of light fixture according to the difference received and running voltage convergence is preset current value and magnitude of voltage.Thus realize controlling operating current and the running voltage of light fixture; avoid light fixture that stream, overvoltage, undercurrent and the abnormal phenomena such as under-voltage occurred; simultaneously; tend to determining value owing to the operating current of light fixture can be controlled; it is thus possible to control the brightness of light fixture, and then reach protect light fixture and regulate the effect of lamp brightness.
Accompanying drawing explanation
Fig. 1 is the detection control circuit module map of light fixture electric parameter；
Fig. 2 is the detection control circuit schematic diagram of light fixture electric parameter.
Detailed description of the invention
As it is shown in figure 1, be the detection control circuit module map of light fixture electric parameter.
A kind of detection control circuit of light fixture electric parameter, for the current electric parameter of light fixture is detected and makes correction, including the current detection module 101 for detecting light fixture operating current signal, for detecting the voltage detection module 103 of lamp working voltage signal, for the operating current signal of light fixture and running voltage signal being converted into the analog-to-digital conversion module 105 of digital signal, for the electric parameter comparison module 107 that the operating current of light fixture and running voltage are compared with the current value preset and magnitude of voltage and be used for the operating current signal to light fixture and electric parameter correcting module 109 that running voltage signal is adjusted.
Described current detection module 101 electrically connects with described analog-to-digital conversion module 105.
Described voltage detection module 103 electrically connects with described analog-to-digital conversion module 105.
Described electric parameter comparison module 107 electrically connects with described analog-to-digital conversion module 105 and described electric parameter correcting module 109 respectively.Electric parameter correcting module 109 electrically connects with light fixture.
Operating current signal and the running voltage signal of reception are converted into digital signal and export to described electric parameter comparison module 107 by described analog-to-digital conversion module 105, obtained operating current and running voltage are compared by described electric parameter comparison module 107 with the current value preset and magnitude of voltage, and the differential transmission after comparing gives described electric parameter correcting module 109, the difference that described electric parameter correcting module 109 export according to described electric parameter comparison module 107 controls the operating current of light fixture and the default current value of running voltage convergence and magnitude of voltage.
Current detection module 101 is for detecting the operating current of light fixture.General, light fixture operating current determines the brightness of light fixture, and particularly, from the point of view of LED lamp, the electric current that drives of LED lamp determines the luminosity of LED lamp, therefore, brightness regulation and the brilliance control to LED lamp, needs to obtain the operating current of LED lamp.Thus, use current detection module 101 that the operating current of light fixture carries out detection and can obtain the brightness of light fixture in time and whether meet preset requirement.
Voltage detection module 103 detects the running voltage of light fixture, it is to avoid light fixture is in overvoltage or under-voltage condition, and user cannot learn, in turn results in light fixture and damages.
Analog-to-digital conversion module 105 is used for converting analog signals into digital signal.The analogue signal that current detection module 101 and voltage detection module 103 detect is converted to the digital signal that electric parameter comparison module 107 is capable of identify that by analog-to-digital conversion module 105.Thus electric parameter comparison module 107 can export corresponding comparative result according to the signal that current detection module 101 and voltage detection module 103 detect.
Electric parameter comparison module 107 exports corresponding comparative result for the digital signal according to analog-to-digital conversion module 105 output and default current value with magnitude of voltage.Concrete, electric parameter comparison module 107 is used for the difference of the operating current of the output electric current measure module 101 detection running voltage with the difference of pre-set current value and voltage detection module 103 detection and preset voltage value.
The operating current of the difference correction light fixture that electric parameter correcting module 109 exports according to electric parameter comparison module 107 and running voltage.Specifically, the current differential exported when electric parameter comparison module 107 is I1, i.e. the operating current of current detection module 101 detection is I with the difference of pre-set current value1, light fixture operating current is too high, then electric parameter correcting module 109 is then according to difference I1The operating current adjusting light fixture declines I1.When the current value of electric parameter comparison module 107 output is-I1, i.e. the operating current of current detection module 101 detection is-I with the difference of pre-set current value1, light fixture operating current is too low, then electric parameter correcting module 109 is then according to difference I1The operating current adjusting light fixture rises I1.It is to make the operating current of light fixture equal with pre-set current value that electric parameter correcting module 109 final adjusts purpose.The running voltage that electric parameter correcting module 109 adjusts light fixture is identical with the operating current principle adjusting light fixture.
Incorporated by reference to Fig. 2.
Current detection module 101 includes current sense resistor Rs and current detecting chip；Described current sense resistor Rs is series between positive source and light fixture, current detecting positive pole and the power end of described current detecting chip all electrically connect with positive source, the current detecting negative pole of described current detecting chip electrically connects with light fixture, and the sample rate current port of described current detecting chip electrically connects with described analog-to-digital conversion module 105.
Current detecting chip is MAX4080.
Current detection circuit is built with MAX4080 for core, by an external detection resistance, the ohmically electric current of detection (being i.e. LED forward conduction electric current) can be converted to voltage signal and export on the 8th foot by MAX4080, finally can calculate detected electric current according to the gain factor (i.e. the output voltage of chip the 8th foot and the ratio of the ohmically pressure drop of detection) of the resistance of detection resistance and chip.
Current sense resistor Rs needs to be specifically designed.The lowest resistance should be selected, and notice that resistor power must is fulfilled for circuit real needs.Furthermore, resistance must be connected between power supply input and load, and can not be connected between load and earth terminal.This is because: current detection module 101 is connected directly to power supply, and all of descending fault can be detected, as power supply and between accidental short circuit；Current sense resistor Rs is directly grounded the additional interference that may introduce.The 0.5 Ω metalfilmresistor that the present invention selects precision to be 1%.
Consult the available computing formula of datasheet of chip: VOUT=Gain RSENSE·ILOAD, wherein, VOUTFor the output voltage values of pin 8, Gain is chip gain factor, RSENSEFor examining the resistance of leakage resistance, ILOADFor the current value on the current value on the light fixture that circuit is to be detected, i.e. inspection leakage resistance.
Then the computing formula of lamp current is:
ILOAD=VOUT/(Gain·RS)。
Voltage detection module 103 includes that divider resistance R1 and divider resistance R2, one end of described divider resistance R1 electrically connect with the points of common connection of positive source and light fixture, and the other end electrically connects with described divider resistance R2, one end ground connection of described divider resistance R2.Divider resistance R1 electrically connects with described analog-to-digital conversion module 105 with the points of common connection of described divider resistance R2.
Voltage detection module 103 also includes that Zener diode ZD1 and filter capacitor C1, described Zener diode ZD1 are parallel to the two ends of described divider resistance R2, the plus earth of described Zener diode ZD1, and described filter capacitor C1 is parallel to described divider resistance R2 two ends.
The resistance of divider resistance R1 is 300K Ω, and the resistance of divider resistance R2 is 20K Ω.
Voltage detection module 103 make use of the principle of electric resistance partial pressure, voltage bigger on light fixture is converted into a small voltage (i.e. in the rated voltage of the input pin of control chip) less than 3.3V by dividing potential drop, the voltage parameter on light fixture can be calculated by the resistance value ratio of known two divider resistances.
The computing formula of light fixture voltage is:
VLOAD=VDIV(R1+R2)/R2, wherein, VLOADFor the magnitude of voltage in the LED lamp that circuit is to be detected, VDIVFor the small voltage after dividing potential drop.
Analog-to-digital conversion module 105 includes A/D converter, described A/D converter includes input and outfan, the input of described A/D converter electrically connects with described current detection module 101 and described voltage detection module 103, and the outfan of described A/D converter electrically connects with described electric parameter comparison module 107.
Electric parameter comparison module 107 includes comparator U1 and comparator U2, the current value that the reference edge input of described comparator U1 is preset, the input of described comparator U1 electrically connects with the outfan of described analog-to-digital conversion module 105, the magnitude of voltage that the reference edge input of described comparator U2 is preset, the input of described comparator U2 electrically connects with the outfan of described analog-to-digital conversion module 105.The outfan of comparator U1 and the outfan of described comparator U2 electrically connect with described electric parameter correcting module.
Electric parameter correcting module 109 includes microprocessor U3, described microprocessor U3 electrically connects with described electric parameter comparison module 107 and light fixture, described microprocessor U3 controls the operating current of light fixture according to the output difference of described electric parameter comparison module 107 and running voltage convergence is preset current value and magnitude of voltage.
Based on above-mentioned all embodiments, power supply selects 48V DC source.
Based on above-mentioned all embodiments, the operation principle of the detection control circuit of light fixture electric parameter is as follows:
Current detection module 101 detects the electric current on the current sense resistor Rs connected with light fixture by current detecting chip MAX4080, thus reaches to detect the purpose of lamp current.Due to the 0.5 Ω metalfilmresistor that current sense resistor Rs is precision 1%, thus, the power that current detection module 101 consumes is less.
Meanwhile, voltage detection module 103, by electric resistance partial pressure principle, detects the voltage of the divider resistance R1 in parallel with light fixture and reaches to detect the purpose of light fixture voltage.
The current value of detection is transferred to A/D converter by current detecting chip MAX4080, and meanwhile, the magnitude of voltage of detection is transferred to A/D converter by voltage detection module 103.A/D converter the current signal of reception and voltage signal are converted into digital signal after corresponding output to comparator U1 and comparator U2.Wherein, comparator U1 is used for comparing electric current, and comparator U2 is used for comparing voltage.The current signal of reception is compared by comparator U1 with the current value preset, and corresponding output current differential.The voltage signal of reception is compared by comparator U2 with the magnitude of voltage preset, and corresponding output voltage difference.
Microprocessor U3 receives comparator U1 and the output signal of comparator U2, and adjusts operating current and the running voltage of light fixture according to the output signal of comparator U1 and comparator U2.Specifically, when the current differential reflection light fixture operating current of comparator U1 output is higher than pre-set current value, microprocessor U3 controls the operating current of light fixture and is decreased to pre-set current value.When the current differential reflection light fixture operating current of comparator U1 output is less than pre-set current value, microprocessor U3 controls the operating current of light fixture and increases to pre-set current value.That is, microprocessor U3 controls light fixture operating current and levels off to pre-set current value.In like manner, microprocessor U3 is also adopted by said process and adjusts the running voltage of light fixture.
The detection control circuit of above-mentioned light fixture electric parameter detects operating current and the running voltage of light fixture by current detection module 101 and voltage detection module 103, then by analog-to-digital conversion module 105, current signal and the voltage signal of light fixture is converted into digital data transmission to electric parameter comparison module 107.And electric parameter comparison module 107 has been preset current value and magnitude of voltage, wherein, the current value preset and magnitude of voltage are ideal current and the voltage of light fixture work.Therefore, voltage signal and the current signal of reception are compared by electric parameter comparison module 107 with the magnitude of voltage preset and current value, and export to electric parameter correcting module 109 by comparing the difference drawn, electric parameter correcting module 109 controls the operating current of light fixture according to the difference received and running voltage convergence is preset current value and magnitude of voltage.Thus realize controlling operating current and the running voltage of light fixture; avoid light fixture that stream, overvoltage, undercurrent and the abnormal phenomena such as under-voltage occurred; simultaneously; tend to determining value owing to the operating current of light fixture can be controlled; it is thus possible to control the brightness of light fixture, and then reach protect light fixture and regulate the effect of lamp brightness.
Embodiment described above only have expressed the several embodiments of the present invention, and it describes more concrete and detailed, but therefore can not be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that, for the person of ordinary skill of the art, without departing from the inventive concept of the premise, it is also possible to make some deformation and improvement, these broadly fall into protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (7)
1. the detection control circuit of a light fixture electric parameter, for the current electric parameter of light fixture is detected and makes correction, it is characterized in that, including the current detection module for detecting light fixture operating current signal, for detecting the voltage detection module of lamp working voltage signal, for the operating current signal of light fixture and running voltage signal being converted into the analog-to-digital conversion module of digital signal, for the electric parameter comparison module that the operating current of light fixture and running voltage are compared with the current value preset and magnitude of voltage and be used for the operating current signal to light fixture and electric parameter correcting module that running voltage signal is adjusted；
Described current detection module electrically connects with described analog-to-digital conversion module；Described voltage detection module electrically connects with described analog-to-digital conversion module；Described electric parameter comparison module electrically connects with described analog-to-digital conversion module and described electric parameter correcting module respectively；Described electric parameter correcting module electrically connects with light fixture；
Operating current signal and the running voltage signal of reception are converted into digital signal and export to described electric parameter comparison module by described analog-to-digital conversion module, obtained operating current and running voltage are compared by described electric parameter comparison module with the current value preset and magnitude of voltage, and the differential transmission after comparing gives described electric parameter correcting module, the difference that described electric parameter correcting module export according to described electric parameter comparison module controls the operating current of light fixture and the default current value of running voltage convergence and magnitude of voltage；
Described electric parameter correcting module includes microprocessor U3, described microprocessor U3 electrically connects with described electric parameter comparison module and light fixture, described microprocessor U3 controls the operating current of light fixture according to the output difference of described electric parameter comparison module and running voltage convergence is preset current value and magnitude of voltage.
The detection control circuit of light fixture electric parameter the most according to claim 1, it is characterised in that described current detection module includes current sense resistor Rs and current detecting chip；Described current sense resistor Rs is series between positive source and light fixture, current detecting positive pole and the power end of described current detecting chip all electrically connect with positive source, the current detecting negative pole of described current detecting chip electrically connects with light fixture, and the sample rate current port of described current detecting chip electrically connects with described analog-to-digital conversion module.
The detection control circuit of light fixture electric parameter the most according to claim 2, it is characterised in that described current detecting chip is MAX4080.
The detection control circuit of light fixture electric parameter the most according to claim 1, it is characterized in that, described voltage detection module includes divider resistance R1 and divider resistance R2, one end of described divider resistance R1 electrically connects with the points of common connection of positive source and light fixture, the other end electrically connects with described divider resistance R2, one end ground connection of described divider resistance R2, described divider resistance R1 electrically connects with described analog-to-digital conversion module with the points of common connection of described divider resistance R2.
The detection control circuit of light fixture electric parameter the most according to claim 4, it is characterized in that, described voltage detection module also includes Zener diode ZD1 and filter capacitor C1, described Zener diode ZD1 is parallel to the two ends of described divider resistance R2, the plus earth of described Zener diode ZD1, described filter capacitor C1 is parallel to described divider resistance R2 two ends.
The detection control circuit of light fixture electric parameter the most according to claim 1, it is characterized in that, described analog-to-digital conversion module includes A/D converter, described A/D converter includes input and outfan, the input of described A/D converter electrically connects with described current detection module and described voltage detection module, and the outfan of described A/D converter electrically connects with described electric parameter comparison module.
The detection control circuit of light fixture electric parameter the most according to claim 1, it is characterized in that, described electric parameter comparison module includes comparator U1 and comparator U2, the current value that the reference edge input of described comparator U1 is preset, the input of described comparator U1 electrically connects with the outfan of described analog-to-digital conversion module, the magnitude of voltage that the reference edge input of described comparator U2 is preset, the input of described comparator U2 electrically connects with the outfan of described analog-to-digital conversion module；The outfan of described comparator U1 and the outfan of described comparator U2 electrically connect with described electric parameter correcting module.
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| CN105281341B (en) * | 2015-10-13 | 2018-06-12 | 株洲变流技术国家工程研究中心有限公司 | A kind of high-pressure thyristor switched capacitor device and operation/cutting method |
| CN105629830A (en) * | 2015-12-22 | 2016-06-01 | 深圳市智行畅联科技有限公司 | Power management method for interconnected automobile electronic device |
| CN105823502B (en) * | 2016-03-14 | 2018-06-19 | 深圳怡化电脑股份有限公司 | A kind of sensor ageing compensation circuit and its method |
| CN117202465B (en) * | 2023-11-08 | 2024-02-09 | 深圳时空数字科技有限公司 | Control method for indoor weak current illumination safety power supply |
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| JP2011036126A (en) * | 2010-10-20 | 2011-02-17 | Toshiba Lighting & Technology Corp | Power supply system |
| CN201904951U (en) * | 2010-12-09 | 2011-07-20 | 中山品上照明有限公司 | LED intelligent control drive power supply based on digital processing unit |
| CN102291872A (en) * | 2011-04-21 | 2011-12-21 | 福州大学 | ZigBee wireless network-based solar streetlamp networked monitoring system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011036126A (en) * | 2010-10-20 | 2011-02-17 | Toshiba Lighting & Technology Corp | Power supply system |
| CN201904951U (en) * | 2010-12-09 | 2011-07-20 | 中山品上照明有限公司 | LED intelligent control drive power supply based on digital processing unit |
| CN102291872A (en) * | 2011-04-21 | 2011-12-21 | 福州大学 | ZigBee wireless network-based solar streetlamp networked monitoring system |
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