CN108811257A - A kind of control method of LED illumination System and LED load circuit - Google Patents
A kind of control method of LED illumination System and LED load circuit Download PDFInfo
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- CN108811257A CN108811257A CN201810892005.8A CN201810892005A CN108811257A CN 108811257 A CN108811257 A CN 108811257A CN 201810892005 A CN201810892005 A CN 201810892005A CN 108811257 A CN108811257 A CN 108811257A
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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
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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Abstract
The invention discloses a kind of LED illumination Systems, in the AC-DC source of stable pressure that input terminal is connect with AC power, the constant-current source being connect with the output end of AC-DC source of stable pressure, on the basis of the LED load being connect with constant-current source, AC-DC source of stable pressure further includes not only the temperature detection comparison circuit for detecting AC-DC voltage stabilizing source temperatures including AC-DC main circuits, AC-DC source of stable pressure adjusts output voltage according to the temperature that temperature detection comparison circuit measures, and then reduce the output current of constant-current source, the power of entire LED illumination System is set to reduce, reduce the temperature of AC-DC main circuits, prevent AC-DC voltage stabilizings source temperature from constantly increasing damage circuit, normal work of the guarantee driving power down to LED illumination System.Invention additionally discloses a kind of control methods of LED drive circuit, have above-mentioned advantageous effect.
Description
Technical field
The present invention relates to electronic device fields, more particularly to a kind of LED illumination System and the controlling party of LED load circuit
Method.
Background technology
Light emitting diode is referred to as LED, has many advantages, such as energy conservation and environmental protection, long lifespan, easy to control, has gradually replaced part
Conventional light source is a dark horse in lighting area.In high-power applications field, the driving power of high-powered LED lamp is driven also may be used
A large amount of heat can be distributed, if environment temperature is relatively low, the heat of driving power is also easy to distribute, but if environment temperature
Higher, the heat of driving power is just not easy to dissipate.If the temperature of driving power is excessively high, it is likely that the electronics for keeping it internal
Component failure or damage influence the normal work of driving power, lead to light failure.
How to reduce the temperature of driving power in LED illumination System, protect related electronic devices, ensure driving power so that
The normal work of LED illumination System is those skilled in the art's technical issues that need to address.
Invention content
The object of the present invention is to provide a kind of LED illumination System and the control methods of LED load circuit, for reducing LED
The temperature of driving power in lighting system protects related electronic devices, normal work of the guarantee driving power down to LED illumination System
Make.
In order to solve the above technical problems, the present invention provides a kind of LED illumination System, including：
The AC-DC source of stable pressure that input terminal is connect with AC power is used for what the output end of the AC-DC source of stable pressure was connect
The constant-current source of output current, the output end with the constant-current source are reduced and reduce with the output voltage of the AC-DC source of stable pressure
The LED load of connection, and the temperature detection comparison circuit for detecting the AC-DC voltage stabilizings source temperature；
Wherein, the AC-DC source of stable pressure controls the reduction of its output voltage when the temperature is more than first threshold.
Optionally, the AC-DC source of stable pressure specifically includes：
AC-DC main circuits, output end are connect with the AC-DC main circuits, for setting and controlling the AC-DC main circuits
The voltage loop circuit of output voltage, and between the temperature detection comparison circuit and the voltage loop circuit, work as institute
The voltage control circuit that the setting value of the voltage loop circuit reduces is controlled when stating temperature more than first threshold.
Optionally, the constant-current source specifically includes：
DC-DC main circuits, input terminal connects the input terminal of the DC-DC main circuits and output signal is voltage detecting value
Input voltage detection circuit, output end connect with the DC-DC main circuits, for setting and controlling the DC-DC main circuits
The current loop circuit and input terminal of output current connect the output end of the input voltage detection circuit, when the voltage is examined
Measured value controls the current control circuit that the setting value of the current loop circuit reduces when being less than second threshold.
Optionally, the constant-current source specifically includes：
Impedance adjustable pipe, input terminal connect the constant-current source and export one end and impedance adjustable pipe one end and output letter
Number be the input voltage detection circuit of voltage detecting value, output end connect with the impedance adjustable pipe control terminal, be used for setting and
It controls the current-limiting control circuit of the impedance adjustable tube current and input terminal connects the output of the input voltage detection circuit
The current control electricity that end, the setting value that the current-limiting control circuit is controlled when the voltage detecting value is less than second threshold reduce
Road；
Wherein, the constant-current source output other end connects LED load with the other end of the impedance adjustable pipe.
Optionally, the constant-current source specifically includes：
The impedance adjustable pipe in saturation state when the output voltage of the AC-DC source of stable pressure is less than second threshold, with
And the electric current for controlling the impedance adjustable pipe being connect with the impedance adjustable pipe control terminal is not more than the current limliting of preset value
Control circuit.
Optionally, the AC-DC source of stable pressure be additionally operable to when the temperature be more than first threshold and with the temperature by
The output voltage that is high and controlling the AC-DC main circuits that edges up is gradually reduced.
Optionally, the constant-current source be additionally operable to when the AC-DC source of stable pressure output voltage be less than second threshold and with
The output voltage continuously decreases and adjusts the output current and continuously decrease.
Optionally, the temperature detection comparison circuit includes thermistor.
Optionally, the constant-current source and the LED load are packaged in lamp interior, and the AC-DC source of stable pressure is set to described
Outside lamps and lanterns.
In order to solve the above technical problems, the present invention also provides a kind of control method of LED load circuit, based on above-mentioned arbitrary
LED illumination System described in one, including：
AC-DC source of stable pressure receives the temperature that temperature detection comparison circuit measures, and is more than first threshold time control in the temperature
Make the reduction of its output voltage；
Constant-current source is as the output voltage of the AC-DC source of stable pressure reduces and reduces output current.
LED illumination System provided by the present invention, in the AC-DC source of stable pressure that input terminal is connect with AC power, with AC-DC
The constant-current source of the output end connection of source of stable pressure, further includes for detecting AC-DC on the basis of the LED load being connect with constant-current source
The temperature detection comparison circuit of the temperature of source of stable pressure, AC-DC source of stable pressure are adjusted according to the temperature that temperature detection comparison circuit measures
Output voltage adjusts voltage by temperature to realize, AC-DC master is such as reduced when the temperature of AC-DC main circuits is higher than preset value
The output voltage of circuit further drops the power of entire LED illumination System to reduce the output current of constant-current source accordingly
It is low, the temperature of AC-DC main circuits is reduced with this, prevents AC-DC voltage stabilizings source temperature from constantly increasing damage circuit, and then ensure driving
Normal work of the power supply down to LED illumination System.The present invention also provides a kind of control methods of LED load circuit, have above-mentioned
Advantageous effect, details are not described herein.
Description of the drawings
It, below will be to embodiment or existing for the clearer technical solution for illustrating the embodiment of the present invention or the prior art
Attached drawing is briefly described needed in technology description, it should be apparent that, the accompanying drawings in the following description is only this hair
Some bright embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the structural schematic diagram of the first LED illumination System provided in an embodiment of the present invention；
Fig. 2 is the structural schematic diagram of second of LED illumination System provided in an embodiment of the present invention；
Fig. 3 is the structural schematic diagram of the third LED illumination System provided in an embodiment of the present invention；
Fig. 4 is the structural schematic diagram of the 4th kind of LED illumination System provided in an embodiment of the present invention；
Fig. 5 is the structural schematic diagram of the 5th kind of LED illumination System provided in an embodiment of the present invention；
Fig. 6 is a kind of flow chart of the control method of LED load circuit provided in an embodiment of the present invention.
Specific implementation mode
Core of the invention is to provide a kind of LED illumination System and the control method of LED load circuit, for reducing LED
The temperature of driving power in lighting system protects related electronic devices, normal work of the guarantee driving power down to LED illumination System
Make.
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Fig. 1 is the structural schematic diagram of the first LED illumination System provided in an embodiment of the present invention.As shown in Figure 1, LED shines
Bright system includes：
The AC-DC source of stable pressure 1 that input terminal is connect with AC power, connect with the output end of AC-DC source of stable pressure 1 for
The output voltage of AC-DC source of stable pressure 1 reduces and reduces the constant-current source 2 of output current, the LED of the output end connection of constant-current source 2
Load 3, and the temperature detection comparison circuit 4 for detecting 1 temperature of AC-DC source of stable pressure；
Wherein, AC-DC source of stable pressure 1 controls the reduction of its output voltage when the temperature is more than first threshold.
In the prior art, LED illumination System includes two-stage circuit, and prime is source of stable pressure, and rear class is constant-current source, constant-current source
It is followed by LED load, in LED load operational process, some is converted into thermal energy to input power, and the resistance of LED load
Is reduced as own temperature increases, to make the electric current in circuit increase, a large amount of thermal energy of LED load generation, especially according to
The larger occasion of bright power, temperature constantly increases on source of stable pressure, when temperature increases to a certain extent, starts to source of stable pressure and electricity
Element in road damages.The lighting system of the embodiment of the present application can reasonably solve the problems, such as this.
It should be noted that the temperature of AC-DC source of stable pressure 1 described herein, including 1 shell of AC-DC source of stable pressure
The temperature of the circuit of temperature and/or the enclosure, such as the temperature of electronic device, the temperature of the temperature of magnetic device or pcb board
Degree.
In specific implementation, the alternating current of input is converted to direct current by AC-DC source of stable pressure 1.
Temperature detection comparison circuit 4 detects the temperature of AC-DC source of stable pressure 1, and exports a control signal, and characterization is detected
Temperature whether be more than first threshold.
AC-DC source of stable pressure 1 controls its output voltage drop low output voltage when the temperature is more than first threshold.
AC-DC source of stable pressure 1 can specifically refer to existing according to the embodiment of the control signal of input adjustment output voltage
Technology, details are not described herein.
The input voltage of constant-current source 2 is the output voltage of AC-DC source of stable pressure 1, and constant-current source 2 is according to the decline of input voltage
Output current is accordingly decreased, that is, reduces the electric current for flowing through LED load 3, to reduce the power of LED load 3.
With the reduction of the power of LED load 3, help to reduce environment temperature, mitigates environment temperature to AC-DC main circuits
11 excess temperature influences, meanwhile, the brightness of LED load 3 reduces, it helps user knows circuit temperature mistake from the variation of lamp brightness
Height may lead to the information of driving power failure.When the power by reducing LED load 3, and then make the temperature of AC-DC source of stable pressure 1
When degree is reduced to first threshold or less, the output voltage of AC-DC source of stable pressure 1 restores normal value, and LED load 3 is made to work normally.
DC-DC main circuits may be used in the main circuit of constant-current source 2, can also use linear circuit.
Optionally, AC-DC source of stable pressure 1 is additionally operable to control when temperature more than first threshold and as temperature gradually rises
The output voltage of AC-DC main circuits 11 is gradually reduced.Correspondingly, constant-current source 2 is additionally operable to the output voltage when AC-DC main circuits 11
Less than preset second threshold and adjusts output current as output voltage continuously decreases and continuously decrease.
Since the output voltage of AC-DC main circuits 11 after excess temperature reduces, and constant-current source 2 decreases output current, also,
If temperature further increases, the output voltage of AC-DC main circuits 11 will further decrease, therewith the output electricity of constant-current source 2
Stream also further decrease, the power of LED load 3 further decreases, also play the role of in this way to the improvement of environment temperature it is lasting,
Under the control, the temperature of AC-DC main circuits 11 can quickly be reduced to first threshold or following.
In practical applications, constant-current source 2 and LED load 3 can be packaged in lamp interior, AC-DC source of stable pressure 1 is set to lamp
Tool is external, to reduce the influence after 1 excess temperature of AC-DC source of stable pressure to constant-current source 2 and LED load 3.
LED illumination System provided in an embodiment of the present invention, in the AC-DC source of stable pressure that input terminal is connect with AC power, with
The constant-current source of the output end connection of AC-DC source of stable pressure, further includes for detecting on the basis of the LED load being connect with constant-current source
The temperature detection comparison circuit of AC-DC voltage stabilizing source temperatures, when the temperature that temperature detection comparison circuit measures is more than first threshold,
AC-DC source of stable pressure reduces output voltage, meanwhile, constant-current source detects to be reduced accordingly after AC-DC source of stable pressure output voltages reduce
The output current of constant-current source, realizes the function of overheat protector, and the power of entire LED illumination System is made to reduce, and is dropped with this
The temperature of low AC-DC main circuits, prevent AC-DC voltage stabilizings source temperature constantly increase damage circuit, and then ensure driving power so that
The normal work of LED illumination System.
Fig. 2 is the structural schematic diagram of second of LED illumination System provided in an embodiment of the present invention.As shown in Fig. 2, above-mentioned
On the basis of embodiment, in another embodiment, AC-DC source of stable pressure 1 can specifically include：
AC-DC main circuits 11, output end are connect with the AC-DC main circuits 11, for setting and controlling the AC-DC master
The voltage loop circuit 12 of 11 output voltage of circuit, and it is set to the temperature detection comparison circuit 4 and the voltage loop circuit 12
Between, when the temperature be more than first threshold when control the voltage loop circuit 12 setting value reduce voltage control circuit
13。
On the basis of the above embodiments, a kind of preferred embodiment is by AC-DC main circuits 11, voltage control electricity
Road 13 and voltage loop circuit 12 realize the output voltage V that the temperature of basis is adjusted1Process.
In specific implementation, AC-DC main circuits 11 are power circuit, for the alternating current of input to be converted to direct current,
And by voltage loop circuit 12 by output voltage V1Stablize to a certain value.
When voltage control circuit 13, which receives the temperature that temperature detection comparison circuit measures, is higher than first threshold, electricity is reduced
Output voltage setting value of the pressure ring circuit 12 to AC-DC main circuits 11.
Voltage loop circuit 12 detects the output voltage V of AC-DC main circuits 111Obtain output voltage sampled value, and by its with
Internal output voltage a reference value compares, and the output voltage sampled value and output voltage a reference value have codetermined output voltage
Setting value, voltage loop circuit 12 controls AC-DC main circuits 11 according to the comparison result of sampled value and a reference value, makes AC-DC master
The output voltage V of circuit 111Amplitude be equal to or be infinitely close to output voltage setting value.
Optionally, temperature detection comparison circuit 4 may include thermistor, and physical circuit design can refer to existing skill
Art, details are not described herein.
Fig. 3 is the structural schematic diagram of the third LED illumination System provided in an embodiment of the present invention.As shown in figure 3, above-mentioned
On the basis of embodiment, in another embodiment, constant-current source 2 can specifically include：
DC-DC main circuits 21, input terminal connects the input terminal of the DC-DC main circuits 21 and output signal is examined for voltage
The input voltage detection circuit 22 of measured value, output end are connect with the DC-DC main circuits 21, for setting and controlling the DC-
The current loop circuit 23 and input terminal of 21 output current of DC main circuits connect the output of the input voltage detection circuit 22
The current control electricity that end, the setting value that the current loop circuit 23 is controlled when the voltage detecting value is less than second threshold reduce
Road 24.
In specific implementation, the output electricity of the input voltage of the input terminal of DC-DC main circuits 21 namely AC-DC source of stable pressure 1
Pressure (therefore it is set as V1).DC-DC main circuits 21 are by input voltage V1DC current output is converted to, and passes through current loop circuit
23 effect is by outputting current steadily in a certain value.
Input voltage detection circuit 22 detects the value of input voltage, as input voltage V1Amplitude be less than preset second threshold
When being worth or being less than preset range, current control circuit 24 is outputed signal to.
Current control circuit 24 is according to present input voltage V1Value output control signals to current loop circuit 23, make electric current
The output current setting value of loop circuit 23 reduces.
The output current that current loop circuit 23 detects DC-DC main circuits 21 obtains output current sampled value, and by its with it is interior
The output current a reference value in portion compares, and the output current sampled value and output current a reference value have codetermined output current
Setting value controls DC-DC main circuits 21 according to comparison result, and the amplitude of the output current of DC-DC main circuits 21 is made to be equal to or nothing
It limits close to output current setting value.The output end of current control circuit 24 can connect the sampling end or base of current loop circuit 23
The output signal of quasi- end namely current control circuit 24 can be superimposed with sampled value or is superimposed with a reference value, can change
The setting value of output current.
Fig. 4 is the structural schematic diagram of four kinds of LED illumination Systems provided in an embodiment of the present invention.As shown in figure 4, in above-mentioned reality
On the basis of applying example, in another embodiment, constant-current source 2 can specifically include：
Impedance adjustable pipe S, input terminal connect the constant-current source 2 and export one end and described one end impedance adjustable pipe S and export
Signal is the input voltage detection circuit 22 of voltage detecting value, and output end is connect, with the impedance adjustable pipe S control terminals for setting
Current-limiting control circuit 25 that is fixed and controlling the impedance adjustable pipe S electric currents and input terminal connect the input voltage measurement electricity
The electricity that the output end on road, the setting value that the current-limiting control circuit is controlled when the voltage detecting value is less than second threshold reduce
Flow control circuit 24；
Wherein, the constant-current source 2 exports the other end and connects LED load with the other end of the impedance adjustable pipe S.
It mentions in the above-described embodiments, the main circuit of constant-current source 2 is specifically as follows linear circuit.On this basis, this hair
In the LED illumination System that bright embodiment provides, constant-current source 2 specifically includes impedance adjustable pipe S, input voltage detection circuit 22, electricity
Flow control circuit 24, current-limiting control circuit 25.
In specific implementation, current-limiting control circuit 25 detects electric current (or load current) I of impedance adjustable pipe SoIt is adopted
Sample value, and compared with the cut-off current of its storage inside, the electric current that sampled value has codetermined impedance adjustable pipe with cut-off current is set
Value, current-limiting control circuit 25 control impedance adjustable pipe S according to the comparison of sampled value and cut-off current, make output current IoAmplitude not
More than cut-off current；The output end of current control circuit 24 can connect sampling end or the current limliting end of current-limiting control circuit 25,
I.e. the output signal of current control circuit 24 can be superimposed with sampled value or is superimposed with cut-off current, can change output current
Setting value；
Voltage detecting circuit 22 detects input voltage V1Value, as input voltage V1When amplitude is less than preset second threshold,
Current control circuit 24 is outputed signal to, current control circuit 24 is according to present input voltage V1Value output control signals to limit
Flow control circuit 25 makes the setting value of current-limiting control circuit 25 reduce, and then reduces electric current IoValue.
Impedance adjustable pipe S under current-limiting control circuit 25 individually control, can control the electricity for flowing through impedance adjustable pipe S
Stream makes the value of the electric current be no more than cut-off current.
For example, working as input voltage V1Amplitude it is higher, keep the electric current for flowing through LED load 3 and impedance adjustable pipe S higher, when
Higher than setting cut-off current when, current-limiting control circuit 25 can control impedance adjustable pipe S impedance increase, to increase circuit
Impedance, and then electric current is reduced, until being adjusted to output current is close or equal to cut-off current.And work as input voltage V1Amplitude reduces
When, the output current that current-limiting control circuit 25 detects is less than cut-off current, then controls the resistance value of impedance adjustable pipe S and reduce, to rise
The electric current of high circuit makes it maintain cut-off current, and impedance adjustable pipe S is operated in limited current state at this time；With input voltage V1's
Further decreasing the resistance value of impedance adjustable pipe S reduces, when the resistance value of impedance adjustable pipe S is reduced to the impedance of saturation state, if
Input voltage V1The impedance for continuing to reduce then impedance adjustable pipe S is not changing, but is in saturation state, at this time the electric current of circuit
Then cut-off current is not being maintained, but with input voltage V1Reduction and reduce.
In embodiments of the present invention, when the AC-DC source of stable pressure 1 of prime reduces output voltage V due to excess temperature1When, electricity
The both end voltage of LED load 3 and impedance adjustable pipe S in road reduces, and makes current reduction, the current control circuit 24 of the present embodiment
It setting value is reduced, such as increases sampled value in current-limiting control circuit 25 or reduces cut-off current, then current-limiting control circuit 25
Setting value reduces, and impedance adjustable pipe S always works at limited current state.Meanwhile as long as the reduction amplitude of cut-off current is enough, control
Impedance adjustable pipe S then in input voltage V1Undersaturated condition namely impedance adjustable pipe S is all kept to work always during declining
In the state more than saturation impedance.
Therefore in embodiments of the present invention under the mode of this control cut-off current, although cut-off current is with V1Reduction and drop
It is low, flow through the electric current I of LED load 3oAlways by impedance adjustable pipe S and the control of current-limiting control circuit 25 in cut-off current.
Fig. 5 is the structural schematic diagram of the 5th kind of LED illumination System provided in an embodiment of the present invention.As shown in figure 5, above-mentioned
On the basis of embodiment, in another embodiment, constant-current source 2 can specifically include：
The impedance adjustable pipe S in saturation state when the output voltage of the AC-DC source of stable pressure is less than second threshold, with
And Current limited Control of the electric current no more than preset value connect with the impedance adjustable pipe S, for controlling the impedance adjustable pipe S
Circuit 25.
In input voltage V1When decline, cut-off current reduction is not controlled, meanwhile, the state of design impedance adjustable pipe S and input
Voltage V1Second threshold match, then can realize as input voltage V1Drop to second threshold, impedance adjustable pipe S also reaches
Saturation state, as input voltage V1Continuing to decline, the impedance of impedance adjustable pipe S no longer changes, the electric current that flows through (namely LED is negative
Carry electric current) decline therewith, it can also realize that the purpose that output current declines with the decline of input voltage, i.e. prime AC-DC are steady
Output voltage V is reduced after 1 excess temperature of potential source1, and the constant-current source 2 of rear class is in output voltage V1After being reduced to second threshold, its output
Electric current IoIt reduces, the power of LED load 3 is made to reduce.
Therefore as shown in figure 5, constant-current source 2 can specifically include impedance adjustable pipe S and current-limiting control circuit 25, wherein：
Current-limiting control circuit 25 detects output current (or load current) IoObtain sampled value, and with the limit of its storage inside
Flow valuve compares, and controls impedance adjustable pipe S according to comparison result, makes output current IoAmplitude be no more than cut-off current.Meanwhile when defeated
Enter voltage V1For preset value when, impedance adjustable pipe S is in saturation state.
It should be noted that in the above-described embodiments, temperature detection comparison circuit 4, voltage loop circuit 12 and voltage control
Circuit 13 can be realized by analog circuits such as hardwired electronic circuits, or can also pass through the digital circuits such as software program reality
It is existing.Similarly, input voltage detection circuit 22, current loop circuit 23 and current control circuit 24 are also such.
Fig. 6 is a kind of flow chart of the control method of LED load circuit provided in an embodiment of the present invention.
The corresponding each embodiment of LED illumination System as detailed above, on this basis, the invention also discloses with it is above-mentioned
The control method of the corresponding LED load circuit of LED illumination System.
As shown in fig. 6, the controlling party of the LED load circuit based on the LED illumination System described in above-mentioned any one embodiment
Method includes：
S10：AC-DC source of stable pressure receives the temperature that temperature detection comparison circuit measures, and is more than first threshold time control in temperature
Make the reduction of its output voltage；
S11：Constant-current source is as the output voltage of AC-DC source of stable pressure reduces and reduces output current.
Since the embodiment and the embodiment of LED illumination System part of the control method part of LED load circuit are mutually right
It answers, therefore the embodiment of the control method part of LED load circuit refers to the description of the embodiment of LED illumination System part,
Here it wouldn't repeat.
In several embodiments provided herein, it should be understood that disclosed system, method can pass through it
Its mode is realized.For example, the apparatus embodiments described above are merely exemplary, for example, the division of module, only
A kind of division of logic function, formula that in actual implementation, there may be another division manner, such as multiple module or components can combine or
Person is desirably integrated into another system, or some features can be ignored or not executed.Another point, shown or discussed is mutual
Between coupling, direct-coupling or communication connection can be INDIRECT COUPLING or communication link by some interfaces, device or module
It connects, can be electrical, machinery or other forms.The module illustrated as separating component may or may not be physics
Upper separated, the component shown as module may or may not be physical module, you can be located at a place, or
Person may be distributed on multiple network modules.Some or all of module therein can be selected according to the actual needs to come in fact
The purpose of existing this embodiment scheme.
In addition, each function module in each embodiment of the application can be integrated in a processing module, it can also
That modules physically exist alone, can also two or more modules be integrated in a module.Above-mentioned integrated mould
The form that hardware had both may be used in block is realized, can also be realized in the form of software function module.
The control method of a kind of LED illumination System provided by the present invention and LED load circuit has been carried out in detail above
It introduces.Each embodiment is described by the way of progressive in specification, and the highlights of each of the examples are implement with other
The difference of example, just to refer each other for identical similar portion between each embodiment.For the device disclosed in the embodiment,
Since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related place is referring to method part illustration
It can.It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, may be used also
With several improvements and modifications are made to the present invention, these improvement and modification are also fallen within the protection scope of the claims of the present invention.
It should also be noted that, in the present specification, relational terms such as first and second and the like be used merely to by
One entity or operation are distinguished with another entity or operation, without necessarily requiring or implying these entities or operation
Between there are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant meaning
Covering non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only that
A little elements, but also include other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of equipment.In the absence of more restrictions, the element limited by sentence "including a ...", is not arranged
Except there is also other identical elements in the process, method, article or apparatus that includes the element.
Claims (10)
1. a kind of LED illumination System, which is characterized in that including：
The AC-DC source of stable pressure that input terminal is connect with AC power, connect with the output end of the AC-DC source of stable pressure for
The output voltage of the AC-DC source of stable pressure reduces and reduces the constant-current source of output current, is connect with the output end of the constant-current source
LED load, and the temperature detection comparison circuit for detecting the AC-DC voltage stabilizings source temperature；
Wherein, the AC-DC source of stable pressure controls the reduction of its output voltage when the temperature is more than first threshold.
2. LED illumination System according to claim 1, which is characterized in that the AC-DC source of stable pressure specifically includes：
AC-DC main circuits, output end are connect with the AC-DC main circuits, for setting and controlling the AC-DC main circuits output
The voltage loop circuit of voltage, and between the temperature detection comparison circuit and the voltage loop circuit, when the temperature
Degree controls the voltage control circuit that the setting value of the voltage loop circuit reduces when being more than first threshold.
3. LED illumination System according to claim 1 or 2, which is characterized in that the constant-current source specifically includes：
DC-DC main circuits, input terminal connects the input terminal of the DC-DC main circuits and output signal is the defeated of voltage detecting value
Enter voltage detecting circuit, output end is connect with the DC-DC main circuits, for setting and controlling the DC-DC main circuits output
The current loop circuit and input terminal of electric current connect the output end of the input voltage detection circuit, when the voltage detecting value
The current control circuit that the setting value of the current loop circuit reduces is controlled when less than second threshold.
4. LED illumination System according to claim 1 or 2, which is characterized in that the constant-current source specifically includes：
Impedance adjustable pipe, the input terminal connection constant-current source exports one end and impedance adjustable pipe one end and output signal is
The input voltage detection circuit of voltage detecting value, output end are connect with the impedance adjustable pipe control terminal, for setting and controlling
The current-limiting control circuit and input terminal of the impedance adjustable tube current connect the input voltage detection circuit output end,
The current control circuit that the setting value of the current-limiting control circuit reduces is controlled when the voltage detecting value is less than second threshold；
Wherein, the constant-current source output other end connects LED load with the other end of the impedance adjustable pipe.
5. LED illumination System according to claim 1 or 2, which is characterized in that the constant-current source specifically includes：
The impedance adjustable pipe in saturation state when the output voltage of the AC-DC source of stable pressure is less than second threshold, Yi Jiyu
The electric current for controlling the impedance adjustable pipe of the impedance adjustable pipe control terminal connection is not more than the Current limited Control of preset value
Circuit.
6. LED illumination System according to claim 1, which is characterized in that the AC-DC source of stable pressure is additionally operable to work as the temperature
Spend control more than first threshold and with the gradually rising for temperature the AC-DC main circuits output voltage it is gradual under
Drop.
7. LED illumination System according to claim 1, which is characterized in that the constant-current source is additionally operable to when the AC-DC is steady
The output voltage of potential source is less than second threshold and as the output voltage continuously decreases and adjusts the output current and gradually drops
It is low.
8. LED illumination System according to claim 2, which is characterized in that the temperature detection comparison circuit includes temperature-sensitive
Resistance.
9. LED illumination System according to claim 1, which is characterized in that the constant-current source and the LED load are packaged in
Lamp interior, the AC-DC source of stable pressure are set to outside the lamps and lanterns.
10. a kind of control method of LED load circuit, which is characterized in that based on the LED described in claim 1 to 9 any one
Lighting system, including：
AC-DC source of stable pressure receives the temperature that temperature detection comparison circuit measures, it is controlled when the temperature is more than first threshold
Output voltage reduces；
Constant-current source is as the output voltage of the AC-DC source of stable pressure reduces and reduces output current.
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| CN201810892005.8A CN108811257A (en) | 2018-08-07 | 2018-08-07 | A kind of control method of LED illumination System and LED load circuit |
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| CN201810892005.8A CN108811257A (en) | 2018-08-07 | 2018-08-07 | A kind of control method of LED illumination System and LED load circuit |
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| CN118042676A (en) * | 2024-02-05 | 2024-05-14 | 东莞市倍祺电子科技有限公司 | LED driving power supply load detection method, system, equipment and medium |
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