CN108811258A - A kind of more LED light source power controls - Google Patents
A kind of more LED light source power controls Download PDFInfo
- Publication number
- CN108811258A CN108811258A CN201810937321.2A CN201810937321A CN108811258A CN 108811258 A CN108811258 A CN 108811258A CN 201810937321 A CN201810937321 A CN 201810937321A CN 108811258 A CN108811258 A CN 108811258A
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- CN
- China
- Prior art keywords
- converter
- light source
- circuit
- value
- led light
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
-
- 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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of more LED light source power controls, including DC-DC converter, can convert input voltage into output voltage；Converter load installs circuit, including at least one light source；Converter automatic control device has the value for indicating that the current strength flowed in circuit is installed in converter load in input terminal；Wherein converter automatic control device includes adjusting circuit, and described value is adjusted to automatically control value by the measured temperature which is suitable for being obtained according to the device by measuring environment temperature.The present invention provides a kind of power control that can cause photosensitiveness loss of energy at a lower temperature.
Description
Technical field
The present invention relates to a kind of for light source, the heat management and power control system of more accurately light emitting diode, specifically
It is related to a kind of more LED light source power controls.
Background technology
Light emitting diode (LED) be it is a kind of electric current by when the electronic component that can shine, the luminous intensity that LED is sent out is general
The intensity for the electric current being determined by, in addition to this, LED is characterized in that current intensity threshold.This maximum forward current value is logical
Often reduce with the raising of temperature, when the electric current of the intensity more than threshold value be used to power for LED, the latter can be damaged or
It destroys.In automotive field, LED technology is increasingly being applied in various optical signal solutions, and LED is for providing light work(
Can, such as daytime running light, signal lamp, they are exposed at high operating temperatures.
From the power supply known in the art for controlling one group or one group LED using control circuit, circuit definitions electric current,
The electric current includes the LED groups being connected in series with by the arm in load, in the field of illuminating device of motor vehicles,
It is especially important to be capable of providing constant brightness, to ensure the peace of the user and the user for being related to road traffic of vehicle
Entirely.In order to provide constant current, it is known that control circuit use various types of DC-DC converters, will for example by automobile electricity
The DC voltage that pond provides is converted into load continuous voltage, this depends on the quantity for the LED being powered, it is known to use by may be programmed
The DC-DC converter of mirco-controller elements management is supplied to the electric current of connection load strong in addition, this converter can change
Degree changes the intensity of LED.For the thermal behavior in view of LED, these elements can change the electric current for being supplied to connection to load
Function of the intensity as the temperature of LED, for DC to the DC converters with fixed target output current value, cost is relatively low
And it is therefore widely used, the heat management of LED is problematic, and the use of this converter is generally not allowed the confession to LED
Electricity carries out Optimal Control.Super-high-current at all temperature that LED is subject to during its operation in order to prevent, uses target current
Minimum constant intensity value becomes imperative, and therefore, when the operating temperature of LED is high, the forward current maximum value of LED will not surpass
Converter is crossed, however, this method causes photosensitiveness loss of energy at a lower temperature.
Technical solution
The invention mainly solves the technical problem of providing a kind of more LED light source power controls, which is characterized in that packet
It includes：DC-DC converter can convert input voltage into output voltage；Converter load install circuit, including it is described at least
One light source；Converter automatic control device in input terminal there is expression to be flowed in the converter load installs circuit
The value of current strength；The wherein described converter automatic control device includes adjusting circuit, which is suitable for basis and passes through survey
Described value is adjusted to automatically control value by the measured temperature that the device of amount environment temperature obtains.
Optionally, wherein the DC to DC converter includes booster circuit, which can increase described defeated
Enter voltage and/or reduction voltage circuit, the input voltage can be reduced.
Optionally, wherein the electricity at terminal by measuring the resistors in parallel being connected in series with the converter load
Pressure obtains the intensity value for the electric current for indicating to be flowed in the converter load installation circuit.
Optionally, wherein at least one light source is light emitting diode.
The beneficial effects of the invention are as follows：
The present invention provides a kind of power control that can cause photosensitiveness loss of energy at a lower temperature.
Description of the drawings
Fig. 1 is the schematic diagram of the preferred embodiment of the system according to the present invention.
Fig. 2 is the circuit diagram for the preferred embodiment for showing the system according to the present invention.
Embodiment
The preferred embodiments of the present invention will be described in detail below so that advantages and features of the invention can be easier to by
It will be appreciated by those skilled in the art that so as to make a clearer definition of the protection scope of the present invention.
Fig. 1 schematically shows power control 100 according to the present invention, and converter 110 can be decompression or rise
Pressure converter, or it is depressured the combination with boost converter, the input direct-current voltage VIN that can will be provided by unshowned source turns
Change output DC voltage VOUT into, converter 110 can provide the electric current with fixed target strength.Load circuit 120 uses
Converter 110 is powered, and load circuit 120 includes at least one, and preferably multiple light sources being connected in series with, these are advantageous hair
Optical diode (LED), power control 100 do not have mirco-controller elements, which contributes to according to its temperature
Degree adjusts the electric current that is provided to LED, it is known that the electric current of auto-controlled converter 110, such as the electricity that will be supplied to load circuit 120
The fixation target current intensity of intensity of flow and converter 110 matches.According to the present invention, automatic control loop further includes for certainly
The adjusting circuit 130 of dynamic controlling value, it includes the device for measuring environment temperature, such as thermistor 132 to adjust circuit 130,
Using measuring device, the value automatically controlled can be adjusted according to the measurement of temperature by adjusting circuit 130.Since measuring device is advantageous
Ground is arranged on printed circuit identical with LED, and the temperature of measurement generally corresponds to the operating temperature of LED, passes through load circuit
The actual value of 120 current strength is preferably connected with load circuit 120 by measurement and R points of the resistors in parallel of downstream connection
Voltage at the terminal of stream obtains.Advantageously, it includes current injection device, such as current source to adjust circuit 130, to survey
When amount temperature is more than threshold value positive current is injected to automatic control loop.For example, thermistor 132 used in selection can be passed through
To set the threshold value, it is preferable that it is at 25 DEG C or more, and it advantageously corresponds to the work temperature of the LED of load circuit 120
Degree.Select the intensity of Injection Current so that be added to and automatically control the biasing of value and promote converter 110 that will be transmitted to load circuit
120 electric current is reduced to the value no more than the LED maximum currents received at a threshold temperature.According to the present invention, useful reality is answered
With those skilled in the art can adapt to threshold temperature according to the operating temperature of LED, similarly, be injected by adjusting circuit 130
Current strength be selected as LED its operating temperature and the maximum forward current value of the fixation target current of converter 110 letter
Number.Power control 100 according to the present invention is particularly useful for the lighting device of motor vehicle, and converter 110 is by motor vehicle
The current source supply in portion, for example, motor vehicle battery, the light source powered by power control 100 preferably provides motor vehicle
Optical signal function, this generally describes the operation of power control 100 and key step according to the method for the present invention.
A specific embodiment is described in fig. 2, but will not protect and be limited in given example, based on being retouched
The principle and given example, those skilled in the art stated will execute and/or adapt to this hair according to proposed requirement
It is bright.Unless otherwise indicated, the technical characteristic other embodiments for use in the present invention described for giving embodiment, described
Embodiment in, light emitting diode by be considered as light source an example.Fig. 2 shows power supply formed according to the present invention controls
The operation of the schematic diagram of the electronic circuit of device 200, electronic component and converter 210 will not be explained in detail, because in ability
Known DC-to-dc converter converter 210 as shown is known in domain, and load circuit 220 includes by converter 210
The LED of power supply.Adjustment circuit 230 is used for adjusting the value of current strength for indicating to be flowed in load circuit 220, the initial value and not
Adjusted value is that the voltage at the connection terminal of resistors in parallel R1 is generated by measurement to obtain.Adjusting circuit 230 further includes
Current injection device, especially voltage source VCC.Voltage source VCC is preferably adjusted by the monitoring element of converter 210, to ensure
Stable voltage level, variation is small and can be monitored.Voltage source VCC is connected to converter 210 by thermistor 232
Automatic control loop, the resistance of thermistor 232 reduces with the raising of temperature.Thermistor 232 is connected to switch member
Part Q2 so that switch element Q2 is closed, and only will have predetermined strength when the temperature of thermistor 232 is more than threshold value
Adjusting electric current be injected into automatic control loop.The electricity that electric current is formed by switch element Q2 or transistor unit Tr1 and Tr2
Flow mirror injection.At ambient temperature, it is less than the threshold temperature that thermistor 232 is set, the latter and switch element Q2 are non-conductive, electricity
Stream mirror does not work.At relatively high temperatures, switch element Q2 starts to become conductive under the influence of thermistor 232.By switch member
The electric current that the current mirror that part Q2 or transistor unit Tr1 and Tr2 are formed becomes operable, and transmitted is injected by resistance
In the frequency divider bridge that device R3 and R10 are formed.When switch element Q2 is completely conductive, current strength I12 in current mirror I12 by
VCC/R12 is provided, and therefore, which is injected into divider point, to generate the tune defined by V offsets (i3=) (R3/R10)
Whole or biasing, by selecting size R3, R10, R12 and thermistor 232, therefore, and when thermistor 232 is conductive, this field
Technical staff will calculate to a nicety high temperature regulated value.
The sequencing of above example is only for ease of description, can not represent the quality of embodiment.
Finally it should be noted that：The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, it will be understood by those of ordinary skill in the art that：It still may be used
With technical scheme described in the above embodiments is modified or equivalent replacement of some of the technical features；
And these modifications or replacements, various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (4)
1. a kind of more LED light source power controls, which is characterized in that including：DC-DC converter, can be by input voltage
Be converted to output voltage；Converter load installs circuit, including at least one light source；Converter automatic control device,
Input terminal has the value for indicating that the current strength flowed in circuit is installed in the converter load；The wherein described converter is automatic
Control device includes adjusting circuit, the measured temperature which is suitable for being obtained according to the device by measuring environment temperature
Described value is adjusted to automatically control value.
2. a kind of more LED light source power controls according to claim 1, it is characterised in that：The wherein described direct current arrives
Direct current transducer includes booster circuit, which can increase the input voltage and/or reduction voltage circuit, can be reduced
The input voltage.
3. a kind of more LED light source power controls according to claim 1, it is characterised in that：Wherein, by measure with
Voltage at the terminal for the resistors in parallel that the converter load is connected in series with obtains and indicates the converter load installation electricity
The intensity value of the electric current flowed in road.
4. a kind of more LED light source power controls according to claim 1, it is characterised in that：Wherein described at least one
A light source is light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810937321.2A CN108811258A (en) | 2018-08-16 | 2018-08-16 | A kind of more LED light source power controls |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810937321.2A CN108811258A (en) | 2018-08-16 | 2018-08-16 | A kind of more LED light source power controls |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108811258A true CN108811258A (en) | 2018-11-13 |
Family
ID=64080203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810937321.2A Withdrawn CN108811258A (en) | 2018-08-16 | 2018-08-16 | A kind of more LED light source power controls |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108811258A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI777578B (en) * | 2021-05-26 | 2022-09-11 | 台達電子工業股份有限公司 | An led power control device with precise control ability of tiny current and control method of the same |
-
2018
- 2018-08-16 CN CN201810937321.2A patent/CN108811258A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI777578B (en) * | 2021-05-26 | 2022-09-11 | 台達電子工業股份有限公司 | An led power control device with precise control ability of tiny current and control method of the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20181113 |
|
| WW01 | Invention patent application withdrawn after publication |