CN205946274U - Control circuit of switching power supply and constant current LED lamp - Google Patents
Control circuit of switching power supply and constant current LED lamp Download PDFInfo
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- CN205946274U CN205946274U CN201621013482.5U CN201621013482U CN205946274U CN 205946274 U CN205946274 U CN 205946274U CN 201621013482 U CN201621013482 U CN 201621013482U CN 205946274 U CN205946274 U CN 205946274U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model provides a control circuit of switching power supply and constant current LED lamp. Wherein, switching power supply includes: power supply, current limiting module and pulse control module, power supply holds and the external load coupling with the input of pulse control module, current limiting module's mains voltage respectively, current limiting module's the signal input part and the current limiting module 1 output end coupling of pulse control module, current limiting module's load signal input part and external load coupling. The pulse control module is used for generating pulse signal to input current limiting module with pulse signal. Current limiting module is used for the time interval that cut -offs according to pulse signal control current limiting module's load signal input to the electric current that makes input external load is the linear change of constant current. Electric current through control input external load is the linear change of constant current to the stability of the electric current of input lamps and lanterns has been improved, and then the stability of lamps and lanterns luminance when the low light that LED made as luminescent material can be effectual improvement used.
Description
Technical field
The utility model is related to technical field of electricity, in particular to the control of a kind of Switching Power Supply and constant current LED lamp
Circuit.
Background technology
With scientific and technical development and raising, it is luminous with light emitting diode (Light Emitting Diode, LED)
The light fixture that material makes has been obtained for being widely applied.The luminous lamp tube of light fixture is mostly joined by several LED strip or composes in parallel.
Pass through the brightness controlling the size of current being passed through luminous lamp tube just can control light fixture in light fixture.But in current prior art
In, the control circuit in light fixture can not control the electric current being passed through luminous lamp tube, well when the luminance needing luminous lamp tube
When degree reduces, being passed through the degree of accuracy of the curent change of luminous lamp tube, can not to be adapted to luminous lamp tube well required suitable when low smooth
Join, thus causing, light fixture is luminous unstable when low smooth, and then be also that brightness when low smooth is unstable.Therefore, such as
What the effective light fixture improving with LED as luminescent materials stability of brightness when low smooth is current industry a great problem.
Utility model content
The purpose of this utility model is to provide the control circuit of a kind of Switching Power Supply and constant current LED lamp, and it can be effective
The stability improving light fixture brightness when low smooth with LED as luminescent materials.
In a first aspect, the utility model embodiment provides a kind of Switching Power Supply, including：Power supply, current limliting module and
Pulse control module, the described power supply power supply electricity with the input of described pulse control module, described current limliting module respectively
Pressure side and external loading coupling, the signal input part of described current limliting module and the pulse signal output end of described pulse control module
Coupling, the load signal input of described current limliting module is coupled with described external loading.Described pulse control module is used for generating
Pulse signal, and described pulse signal is inputted described current limliting module.Described current limliting module is used for according to described pulse signal control
Make the switch off time interval of the load signal input of described current limliting module, so that the electric current inputting described external loading is in constant current
Linear change.
Further, described Switching Power Supply also includes：Afterflow compensation circuit, described external loading compensates electricity with described afterflow
The load signal input coupling of first coupling contact points on road, the second contact of described afterflow compensation circuit and described current limliting module
Close, the 3rd contact of described afterflow compensation circuit is coupled with described power supply.Described afterflow compensation circuit is used for by energy storage
With release can so that described current limliting module load signal input disconnect when, described external loading can obtain afterflow and compensation.
Further, described afterflow compensation circuit includes：Compensation circuit and freewheeling circuit；The input of described compensation circuit
With described first coupling contact points, the output end of described compensation circuit and described second coupling contact points, the input of described freewheeling circuit
End and described second coupling contact points, the output end of described freewheeling circuit and described 3rd coupling contact points.
Further, described compensation circuit includes：First inductance；One end of described first inductance and described first contact coupling
Conjunction, the other end of described first inductance and described second coupling contact points.
Further, described freewheeling circuit includes：First diode and the first current-limiting resistance, the sun of described first diode
Pole and described second coupling contact points, the negative electrode of described first diode is coupled with one end of described first current-limiting resistance, and described the
The other end of one current-limiting resistance and described 3rd coupling contact points.
Further, described pulse control module includes：Voltage stabilizing module and main control module, the input of described Voltage stabilizing module
Couple with described power supply, the output end of described Voltage stabilizing module is coupled with described main control module, described main control module described
Pulse signal output end is coupled with the signal input part of described current limliting module.
Further, described current limliting module also includes：First electric capacity and the second electric capacity, a termination of described first electric capacity
Ground, the other end of described first electric capacity is coupled with described power supply, one end ground connection of described second electric capacity, described second electric capacity
The other end couple with described power supply.
Second aspect, the utility model embodiment additionally provides a kind of control circuit of constant current LED lamp, including：Controller,
Light emitting module and Switching Power Supply, described controller is coupled with described main control module, the input of described light emitting module with described
Power supply coupling, the output end of described light emitting module and described first coupling contact points.
Further, described main control module is provided with infrared signal receiver, described infrared signal receiver and described control
Device couples.
Further, described light emitting module includes：Multiple light emitting diodes, multiple described light emitting diodes are sequentially connected in series,
The anode of each described light emitting diode is coupled with the negative electrode of adjacent described light emitting diode, each described light emitting diode
Negative electrode is coupled with the anode of adjacent described light emitting diode；In multiple described light emitting diodes, described of first series connection
The anode of optical diode is coupled with described power supply, the negative electrode of described light emitting diode and described first of last series connection
Coupling contact points.
The beneficial effect of the utility model embodiment is：By by the power supply input with pulse control module respectively
End, the power voltage terminal of current limliting module and external loading coupling, the signal input part of current limliting module and the arteries and veins of pulse control module
Rush signal output part coupling, the load signal input of current limliting module is coupled with external loading.
Input due to pulse control module is coupled with power supply, thus by power supply provide working power with
Make pulse control module normal work, and then pulse control module by the control instruction outside reception and can generate and control letter
Pulse signal corresponding to number.And the pulse signal output end coupling of the signal input part due to current limliting module and pulse control module
Close, pulse control module just the pulse signal of generation just can be input in current limliting module.
The signal input part of current limliting module can receive the pulse signal of pulse control module input, and current limliting module passes through place
Just can be spaced according to the switch off time of this pulse signal after managing this pulse signal and control the load signal of current limliting module to input
The switch off time interval at end is mated with pulse signal, thus just controlling the virtual value of the electric current being input to external loading.Due to
The change at the switch off time interval of load signal input of all corresponding current limliting module of each outside control instruction, thus each
External control instruction just effectively can also correspond to the virtual value controlling the electric current being input to external loading, so that passing through current limliting
The virtual value of electric current that the current limliting of module just can be accurately controlled input external loading is corresponding with this control instruction.And then pass through
Different control instructions can be in just constant current linear change with the electric current of control input external loading.By control input external loading
Electric current be in constant current linear change, thus improve the stability of the electric current of input light fixture, and then can effectively improve with LED
Stability for light fixture brightness when low smooth of luminescent materials.
Brief description
In order to be illustrated more clearly that the technical scheme of the utility model embodiment, below will be to use required in embodiment
Accompanying drawing be briefly described it will be appreciated that the following drawings illustrate only some embodiments of the present utility model, therefore should be by
Regard the restriction to scope as, for those of ordinary skill in the art, on the premise of not paying creative work, also may be used
To obtain other related accompanying drawings according to these accompanying drawings.
Fig. 1 provides a kind of structured flowchart of Switching Power Supply for the utility model embodiment；
Fig. 2 provides a kind of circuit diagram of Switching Power Supply for the utility model embodiment；
Fig. 3 provides a kind of structured flowchart of the control circuit of constant current LED lamp for the utility model embodiment；
Fig. 4 provides a kind of circuit theory diagrams of the control circuit of constant current LED lamp for the utility model embodiment；
A kind of analogous diagram of the input current of the control circuit of constant current LED lamp that Fig. 5 provides for the utility model embodiment.
Icon：100- Switching Power Supply；110- power supply；120- pulse control module；121- Voltage stabilizing module；122- master control
Module；123- infrared signal receiver；130- current limliting module；140- afterflow compensation circuit；141- compensation circuit；142- afterflow electricity
Road；The control circuit of 200- constant current LED lamp；210- controller；220- light emitting module.
Specific embodiment
Purpose, technical scheme and advantage for making the utility model embodiment are clearer, new below in conjunction with this practicality
Accompanying drawing in type embodiment, is clearly and completely described it is clear that being retouched to the technical scheme in the utility model embodiment
The embodiment stated is a part of embodiment of the utility model, rather than whole embodiments.Generally described in accompanying drawing herein and
The assembly of the utility model embodiment illustrating can be arranged with various different configurations and design.
Therefore, below requirement is not intended to limit to the detailed description of the embodiment of the present utility model providing in the accompanying drawings
The scope of the present utility model of protection, but it is merely representative of selected embodiment of the present utility model.Based in the utility model
Embodiment, the every other embodiment that those of ordinary skill in the art are obtained under the premise of not making creative work, all
Belong to the scope of the utility model protection.
It should be noted that：Similar label and letter represent similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined in individual accompanying drawing, then do not need it to be defined further and explains in subsequent accompanying drawing.Of the present utility model
In description, term " first ", " second ", etc. be only used for distinguish description, and it is not intended that instruction or hint relative importance.
In addition it is also necessary to explanation in description of the present utility model, unless otherwise clearly defined and limited, term " sets
Put ", " connection ", " coupling " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or integratedly
Connect；Can be to be mechanically connected or electrically connect；Can be to be joined directly together it is also possible to be indirectly connected to by intermediary,
It can be the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood with concrete condition
Concrete meaning in the utility model for the language.
Refer to Fig. 1, Fig. 1 shows the module map of the Switching Power Supply 100 that the utility model embodiment provides.Switching Power Supply
100 include：Power supply 110, pulse control module 120 and current limliting module 130.
Refer to Fig. 2, Fig. 2 shows the circuit diagram of the Switching Power Supply 100 that the utility model embodiment provides.Power supply
110 are used for providing working power for pulse control module 120, current limliting module 130 and external loading.
The output end of power supply 110 respectively with the power voltage terminal of current limliting module 130, pulse control module 120 defeated
Enter end and external loading coupling.For ensureing the power supply of pulse control module 120, current limliting module 130 and external loading, optionally,
The voltage that power supply 110 is exported can be：12 volts, 18 volts or 24 volts etc..
Pulse control module 120 is used for generating pulse letter corresponding with this control signal according to outside control signal
Number, and this pulse signal is inputted described current limliting module 130.Pulse control module 120 includes：Voltage stabilizing module 121 and master control mould
Block 122.
Voltage stabilizing module 121 is used for for the working power of power supply 110 input pulse control module 120 carrying out voltage stabilizing.Surely
The input VIN of die block 121 is coupled with the output end of working power, the earth terminal GND of Voltage stabilizing module 121 by with ground terminal coupling
Close and be grounded, and output end OUT of Voltage stabilizing module 121 is coupled with the power voltage terminal VCC of main control module 122.By power supply electricity
, after the voltage stabilizing of Voltage stabilizing module 121, Voltage stabilizing module 121 is by the control source after voltage stabilizing to master control mould for the voltage of source 110 input
Block 122 is to provide the power supply of main control module 122.For ensureing the normal power supply of main control module 122, optionally, Voltage stabilizing module 121 is steady
Output voltage after pressure can be 5 volts.In the present embodiment, Voltage stabilizing module 121 is additionally provided with the first protection electric capacity C1, the first guarantor
One end of shield electric capacity C1 is coupled with output end OUT of Voltage stabilizing module 121, the other end ground connection of the first protection electric capacity C1.By
One protection electric capacity C1 energy storage effect, just can form protection to Voltage stabilizing module 121 and main control module 122.
Main control module 122 is used for receiving the control signal of outside, is generated according to outside control signal and this control letter
Pulse signal corresponding to number, and this pulse signal is inputted current limliting module 130.Outer for ensureing that main control module 122 can receive
The control signal in portion, main control module 122 is provided with infrared signal receiver 123.Infrared signal receiver 123 can pass through wireless
Mode receives the control signal of outside input, and control signal is inputted main control module 122.The supply voltage of main control module 122
End VCC is coupled with output end OUT of Voltage stabilizing module 121, the signal input part VIN of main control module 122 and infrared signal receiver
123 output end coupling, the pulse signal output end PWM of main control module 122 is coupled with the signal input part of current limliting module 130.
After the power voltage terminal VCC of main control module 122 inputs 5 volts of working power by accepting Voltage stabilizing module 121, main control module
122 can normally work, thus the signal input part VIN of main control module 122 can receive the defeated of infrared signal receiver 123
Go out the control signal of end input.Main control module 122 pass through process this control signal thus generate with this control signal corresponding to
Pulse signal, and this pulse signal is exported current limliting module 130 by the pulse signal output end PWM of main control module 122
Signal input part.As a kind of mode, the control signal that main control module 122 receives is different, and that is, the frequency of control signal is different, from
And the frequency of the pulse signal that correspondence generates is also different.
Current limliting module 130 is used for controlling the switch off time of the load signal input of current limliting module 130 according to pulse signal
Interval, so that the electric current of input external loading is in constant current linear change.Current limliting module 130 includes：Current limliting chip U1, the first electric capacity
C1, the second electric capacity C2, the 3rd electric capacity C3, the 4th electric capacity C4, first resistor R1 and second resistance.The pulse signal of current limliting chip U1
Input DIM is coupled with the pulse signal output end PWM of main control module 122.As a kind of mode, the pulse letter of current limliting chip U1
Number input DIM can accept frequency and be up to 20Khz pulse signal.It should be understood that the pulse signal of current limliting chip U1 is defeated
Enter to hold DIM can think the signal input part of current limliting module 130.The power voltage terminal VIN of current limliting chip U1 and power supply 110
Output end coupling, such that it is able to receive power supply 110 input voltage and realize normal work.One end of first electric capacity C1
Couple with the power voltage terminal VIN of current limliting chip U1, the other end ground connection of the first electric capacity C1.One end of second electric capacity C2 also with limit
The power voltage terminal VIN coupling of stream chip U1, the other end of the second electric capacity C2 is also grounded.Lead to from the first electric capacity C1 and the second electric capacity
The voltage of the power voltage terminal VIN that power supply 110 just can be inputted current limliting chip U1 by C2 is filtered.Current limliting chip U1's
Current sense resistance terminal CSP is coupled with one end of first resistor R1, the other end ground connection of first resistor R1.By by first resistor
The resistance of R1 is adapted to current limliting chip U1, thus by the current limliting of first resistor R1, just ensure that current limliting chip U1's
Normal work.The analogue signal earth terminal GND of current limliting chip U1 and power signal earth terminal GNDP all connects.Current limliting chip U1's
Compensate end COMP to couple with one end of the 3rd electric capacity C3, and the other end of the 3rd electric capacity C3 ground connection.The setting frequency of current limliting chip U1
One end coupling of one end of rate switch terminal FS and second resistance R2, the other end ground connection of second resistance R2.Current limliting chip U1's is interior
Portion's conditioner outlet end is coupled with one end of the 4th electric capacity, and the other end of the 4th electric capacity ground connection.The feedback end of current limliting chip U1
CSN is coupled with external loading.The internal field pipe of current limliting chip U1 is related to extreme LX and is coupled with external loading, thus current limliting chip U1 passes through
Control its internal field pipe relate to extreme LX cut-off frequency just can control power supply 110 input external loading power supply effective
Value.It should be understood that the internal field pipe of current limliting chip U1 relates to the load signal input that extreme LX can think current limliting module 130.
Current limliting chip U1 receives the pulse signal output end pwm pulse signal of main control module 122 by its pulse signal input terminal DIM,
And processed this pulse signal, thus the frequency of cut-offfing that its internal field pipe is related to extreme LX carries out control corresponding with pulse signal
System, and then just can correspond to the virtual value of control input external loading electric current.
For ensureing to input stablizing of the electric current of external loading, current limliting module 130 is additionally provided with afterflow compensation circuit 140.Outside
Load is coupled with the first contact A of afterflow compensation circuit 140, the second contact B's and current limliting chip U1 of afterflow compensation circuit 140
Internal field pipe relates to extreme LX coupling, and the 3rd contact C of afterflow compensation circuit 140 is coupled with the output end of power supply 110.Afterflow is mended
Repay circuit 140 to be used for by energy storage and release energy, so that when the internal field pipe of current limliting chip U1 relates to extreme LX disconnection, external loading can
It is compensated and afterflow.
Afterflow compensation circuit 140 includes：Compensation circuit 141 and freewheeling circuit 142.Compensation circuit 141 is used for by energy storage
With release can so that the internal field pipe of current limliting chip U1 relates to extreme LX when disconnecting, external loading can obtain afterflow and compensation.Compensate electricity
Road 141 includes：First inductance L1；One end of first inductance L1 is coupled with the first contact A, the other end and second of the first inductance L1
Contact B couples.Freewheeling circuit 142 is used for compensate produced to compensation circuit 141 and carries out afterflow.Freewheeling circuit 142 includes：The
One diode D1 and the first current-limiting resistance R1, the anode of the first diode D1 is coupled with the second contact B, the moon of the first diode D1
Pole is coupled with one end of the first current-limiting resistance R1 and the feedback end CSN of current limliting chip U1 respectively, and the first current-limiting resistance R1's is another
End is coupled with the 3rd contact C.
When the internal field pipe of current limliting chip U1 relates to extreme LX closure, the first inductance L1 carries out energy storage.And work as current limliting chip U1
Internal field pipe when relating to extreme LX and disconnecting, the first inductance L1 just carry out releasing can, thus powering for external loading.Meanwhile, first
The electric energy of inductance L1 release passes through the afterflow of the first diode D1 again, thus ensureing lasting powering for external loading.For ensureing
The good afterflow effect of freewheeling circuit 142 is it is preferable that the first diode D1 Ke Yi Wei Xiao Jite diode.By the one or two pole
The feedback end CSN coupling of the negative electrode of pipe D1 and current limliting chip U1, thus when freewheeling circuit 142 carries out afterflow, its circuit just may be used
By with the coupling of the feedback end CSN of current limliting chip U1, thus feeding back to current limliting chip U1.Current limliting chip U1 just can be according to anti-
The electric current of feedback, thus again internal field pipe is related to extreme LX disconnect frequency from being adjusted, and then improves outside to control input
The stability of the constant current linear change of electric current of load.It should be understood that in the utility model embodiment, power supply 110
Coupled with external loading by the 3rd contact C, and what external loading was coupled with afterflow compensation circuit 140 by the first contact A again
Input couples, and couples with one end of the first inductance L1.
Refer to Fig. 3, Fig. 3 shows the control circuit 200 of a kind of constant current LED lamp that the utility model embodiment provides
Module map.The control circuit 200 of this constant current LED lamp includes：Switching Power Supply 100, controller 210 and light emitting module 220.
Refer to Fig. 4, Fig. 4 shows the control circuit 200 of a kind of constant current LED lamp that the utility model embodiment provides
Circuit theory diagrams.
The output end of controller 210 is coupled with the input of infrared signal receiver 123, and controller 210 is used for generating not
Same control signal, and this control signal is exported the input of infrared signal receiver 123.Optionally, controller 210 with
Infrared signal receiver 123 wirelessly couples.
Light emitting module 220 is used for the power supply according to power supply 110 input and is lighted, thus light emitting module 220
Input is coupled with the output end of power supply 110, and the output end of light emitting module 220 is coupled with the first contact A.Light emitting module
220 include：Multiple light emitting diode D1.Multiple light emitting diode D1 are sequentially connected in series, the anode of each light emitting diode D1 and phase
The negative electrode coupling of adjacent light emitting diode D1, the anode coupling of the negative electrode of each light emitting diode D1 and adjacent light emitting diode D1
Close.In multiple light emitting diode D1, the anode of light emitting diode D1 of first series connection is coupled with power supply 110, last
The negative electrode of light emitting diode D1 of individual series connection is coupled with first point of contact A.Because Light-Emitting Diode D1 is according to the little difference of TV university,
And luminous brightness is also different, thus input the electric current of light emitting module 220 by the controlled power supply 110 of Switching Power Supply 100
Virtual value, just can control the brightness of light emitting module 220.
Refer to Fig. 5, Fig. 5 shows the control circuit 200 of a kind of constant current LED lamp that the utility model embodiment provides
The analogous diagram of input current, the solid line of in figure is the input current of the control circuit 200 of constant current LED lamp.In the present embodiment, control
Device 210 processed generates the internal field pipe that the linear change of control signal is capable of current limliting chip U1 and relates to the dutycycle of extreme LX from 0.1%-
100% change, and then the electric current of control input light emitting module 220 is in the 0.1%-100% change of rated value.
In a kind of control circuit 200 of constant current LED lamp that the utility model embodiment is provided, above-mentioned Switching Power Supply
100 control circuits 200 being applied to this constant current LED lamp.Controller 210 generates control signal, and this control signal is exported
The input of infrared signal receiver 123.Infrared signal receiver 123 after its input receives this control signal, then
This control signal is sent to the signal input part VIN of main control chip U1.The signal input part VIN of main control module 122 can connect
Receive the control signal of the output end input of infrared signal receiver 123.Main control module 122 passes through to process this control signal thus giving birth to
Become and the pulse signal corresponding to this control signal, and this pulse signal is passed through the pulse signal output end of main control module 122
PWM exports the pulse signal input terminal DIM of current limliting chip U1.Current limliting chip U1 passes through its pulse signal input terminal DIM and receives
The pulse signal output end pwm pulse signal of main control module 122, and this pulse signal is processed, thus managing to its internal field
The frequency of cut-offfing relating to extreme LX carries out control corresponding with pulse signal, and then just can correspond to control input light emitting module 220
The virtual value of electric current.When the internal field pipe of current limliting chip U1 relates to extreme LX closure, the first inductance L1 carries out energy storage.And work as current limliting core
When the internal field pipe of piece U1 relates to extreme LX disconnection, the first inductance L1 just carries out releasing energy, thus powering for light emitting module 220.Same with this
When, the electric energy of the first inductance L1 release passes through the afterflow of the first diode D1, again thus ensureing lasting supplying for light emitting module 220
Electricity.For ensureing the good afterflow effect of freewheeling circuit 142 it is preferable that the first diode D1 Ke Yi Wei Xiao Jite diode.Pass through
The feedback end CSN coupling of the negative electrode of the first diode D1 and current limliting chip U1, thus when freewheeling circuit 142 carries out afterflow, its
Circuit just can by with the coupling of the feedback end CSN of current limliting chip U1, thus feeding back to current limliting chip U1.Current limliting chip U1 just can
Enough electric currents according to feedback, thus again internal field pipe is related to extreme LX disconnect frequency from being adjusted, and then improve to control
The stability of the constant current linear change of electric current of input light emitting module 220.Linearly change when controller 210 generates control signal
When, what the internal field pipe of corresponding current limliting chip U1 related to extreme LX cut-offs frequency also linear change, thus inputting light emitting module 220
The virtual value of electric current also corresponds to linear change, and then the brightness of light emitting module 220 also corresponds to the control signal that controller 210 produces
Change and keep linear change.
In sum, the utility model implements a kind of Switching Power Supply 100 being provided and the control circuit of constant current LED lamp
200.By by power supply 110 respectively with the input of pulse control module 120, the power voltage terminal of current limliting module 130 and
External loading couples, and the signal input part of current limliting module 130 is coupled with the pulse signal output end of pulse control module 120, limit
The load signal input of flow module 130 is coupled with external loading.
Input due to pulse control module 120 is coupled with power supply 110, thus being provided by power supply 110
Working power is so that pulse control module 120 normal work, and then pulse control module 120 can be referred to by the control outside receiving
Make and generate and the pulse signal corresponding to control signal.And the signal input part due to current limliting module 130 and Pulse Width Control mould
The pulse signal output end coupling of block 120, the pulse signal of generation just just can be input to limit by pulse control module 120
In flow module 130.
The signal input part of current limliting module 130 can receive the pulse signal of pulse control module 120 input, current limliting module
130 just can be spaced according to the switch off time of this pulse signal after processing this pulse signal and control current limliting module 130
The switch off time interval of load signal input is mated with pulse signal, thus just controlling the electric current being input to external loading
Virtual value.Switch off time interval due to the load signal input of all corresponding current limliting module 130 of each outside control instruction
Change, thus each external control instruction just can also effectively correspond to controls the effective of the electric current being input to external loading
Value, so that just can be accurately controlled the virtual value of electric current and this control of input external loading by the current limliting of current limliting module 130
System instruction corresponds to.And then just can be with the electric current of control input external loading in constant current linear change by different control instructions.
Being in constant current linear change by the electric current of control input external loading, thus improve the stability of the electric current of input light fixture, entering
And can effectively improve the stability of light fixture brightness when low smooth with LED as luminescent materials.
The foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, for this
For the technical staff in field, the utility model can have various modifications and variations.All of the present utility model spirit and principle
Within, any modification, equivalent substitution and improvement made etc., should be included within protection domain of the present utility model.
Claims (10)
1. a kind of Switching Power Supply is it is characterised in that include：Power supply, current limliting module and pulse control module, described power supply electricity
Source is coupled with the input of described pulse control module, the power voltage terminal of described current limliting module and external loading respectively, described
The signal input part of current limliting module is coupled with the pulse signal output end of described pulse control module, the load of described current limliting module
Signal input part is coupled with described external loading；
Described pulse control module is used for generating pulse signal, and described pulse signal is inputted described current limliting module；
Described current limliting module is used for controlling when the cut-offfing of load signal input of described current limliting module according to described pulse signal
Between be spaced so that input described external loading electric current be in constant current linear change.
2. Switching Power Supply according to claim 1 is it is characterised in that described Switching Power Supply also includes：Afterflow compensation circuit,
First coupling contact points of described external loading and described afterflow compensation circuit, the second contact of described afterflow compensation circuit with described
The load signal input coupling of current limliting module, the 3rd contact of described afterflow compensation circuit is coupled with described power supply；
Described afterflow compensation circuit is used for by energy storage and releases energy, so that the load signal input of described current limliting module disconnects
When, described external loading can obtain afterflow and compensation.
3. Switching Power Supply according to claim 2 is it is characterised in that described afterflow compensation circuit includes：Compensation circuit and
Freewheeling circuit；The input of described compensation circuit and described first coupling contact points, the output end of described compensation circuit and described the
Two coupling contact points, the input of described freewheeling circuit and described second coupling contact points, the output end of described freewheeling circuit with described
3rd coupling contact points.
4. Switching Power Supply according to claim 3 is it is characterised in that described compensation circuit includes：First inductance；Described
One end of one inductance and described first coupling contact points, the other end of described first inductance and described second coupling contact points.
5. Switching Power Supply according to claim 3 is it is characterised in that described freewheeling circuit includes：First diode and
One current-limiting resistance, the anode of described first diode and described second coupling contact points, the negative electrode of described first diode with described
One end coupling, the other end of described first current-limiting resistance and described 3rd coupling contact points of the first current-limiting resistance.
6. Switching Power Supply according to claim 1 is it is characterised in that described pulse control module includes：Voltage stabilizing module and
Main control module, the input of described Voltage stabilizing module is coupled with described power supply, the output end of described Voltage stabilizing module and described master
Control module coupling, the described pulse signal output end of described main control module is coupled with the signal input part of described current limliting module.
7. Switching Power Supply according to claim 1 is it is characterised in that described current limliting module also includes：First electric capacity and
Two electric capacity, one end ground connection of described first electric capacity, the other end of described first electric capacity is coupled with described power supply, and described second
One end ground connection of electric capacity, the other end of described second electric capacity is coupled with described power supply.
8. a kind of control circuit of constant current LED lamp is it is characterised in that include：Controller, light emitting module and as claim 1-
Switching Power Supply described in 7 any one, described controller is coupled with described pulse control module, the input of described light emitting module with
Described power supply coupling, the output end of described light emitting module is coupled with described current limliting module.
9. the control circuit of constant current LED lamp according to claim 8 is it is characterised in that described pulse control module is provided with
Infrared signal receiver, described infrared signal receiver is coupled with described controller.
10. the control circuit of constant current LED lamp according to claim 8 is it is characterised in that described light emitting module includes：Many
Individual light emitting diode, multiple described light emitting diodes are sequentially connected in series, and the anode of each described light emitting diode is described with adjacent
The negative electrode coupling of light emitting diode, the anode coupling of the negative electrode of each described light emitting diode and adjacent described light emitting diode
Close；In multiple described light emitting diodes, the anode of described light emitting diode of first series connection is coupled with described power supply,
The negative electrode of described light emitting diode of a series connection and described current limliting module afterwards.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621013482.5U CN205946274U (en) | 2016-08-31 | 2016-08-31 | Control circuit of switching power supply and constant current LED lamp |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621013482.5U CN205946274U (en) | 2016-08-31 | 2016-08-31 | Control circuit of switching power supply and constant current LED lamp |
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| Publication Number | Publication Date |
|---|---|
| CN205946274U true CN205946274U (en) | 2017-02-08 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621013482.5U Withdrawn - After Issue CN205946274U (en) | 2016-08-31 | 2016-08-31 | Control circuit of switching power supply and constant current LED lamp |
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| Country | Link |
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| CN (1) | CN205946274U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106376126A (en) * | 2016-08-31 | 2017-02-01 | 江苏达伦电子股份有限公司 | Switching power supply and constant-current linear changing method for current, and control circuit of LED lamp |
-
2016
- 2016-08-31 CN CN201621013482.5U patent/CN205946274U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106376126A (en) * | 2016-08-31 | 2017-02-01 | 江苏达伦电子股份有限公司 | Switching power supply and constant-current linear changing method for current, and control circuit of LED lamp |
| CN106376126B (en) * | 2016-08-31 | 2018-05-22 | 江苏达伦电子股份有限公司 | Switching Power Supply and the linear changing method of electric current constant current, the control circuit of LED light |
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